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  • Transfection  (114)
  • American Association for the Advancement of Science (AAAS)  (114)
  • 1995-1999  (114)
  • 1999  (57)
  • 1997  (57)
Collection
Keywords
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  • American Association for the Advancement of Science (AAAS)  (114)
  • Springer  (1)
Years
  • 1995-1999  (114)
Year
  • 1
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    Affinity-driven peptide selection of an NFAT inhibitor more selective than cyclosporin A (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-09-25
    Description: The flow of information from calcium-mobilizing receptors to nuclear factor of activated T cells (NFAT)-dependent genes is critically dependent on interaction between the phosphatase calcineurin and the transcription factor NFAT. A high-affinity calcineurin-binding peptide was selected from combinatorial peptide libraries based on the calcineurin docking motif of NFAT. This peptide potently inhibited NFAT activation and NFAT-dependent expression of endogenous cytokine genes in T cells, without affecting the expression of other cytokines that require calcineurin but not NFAT. Substitution of the optimized peptide sequence into the natural calcineurin docking site increased the calcineurin responsiveness of NFAT. Compounds that interfere selectively with the calcineurin-NFAT interaction without affecting calcineurin phosphatase activity may be useful as therapeutic agents that are less toxic than current drugs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Aramburu, J -- Yaffe, M B -- Lopez-Rodriguez, C -- Cantley, L C -- Hogan, P G -- Rao, A -- R01 AI 40127/AI/NIAID NIH HHS/ -- R01 GM056203/GM/NIGMS NIH HHS/ -- R01 HL 03601/HL/NHLBI NIH HHS/ -- R43 AI 43726/AI/NIAID NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1999 Sep 24;285(5436):2129-33.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, Harvard Medical School, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10497131" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; Calcineurin/*metabolism ; Calcineurin Inhibitors ; Cell Nucleus/metabolism ; Cyclosporine/pharmacology ; Cytokines/biosynthesis/genetics ; DNA-Binding Proteins/*antagonists & inhibitors/chemistry/metabolism ; Gene Expression Regulation ; Genes, Reporter ; HeLa Cells ; Humans ; Immunosuppressive Agents/chemistry/metabolism/*pharmacology ; Jurkat Cells ; Molecular Sequence Data ; NFATC Transcription Factors ; *Nuclear Proteins ; Oligopeptides/chemistry/metabolism/*pharmacology ; Peptide Library ; Peptides/chemistry/metabolism/*pharmacology ; Phosphorylation ; Recombinant Fusion Proteins/metabolism ; T-Lymphocytes/*drug effects/immunology ; Transcription Factors/*antagonists & inhibitors/chemistry/metabolism ; Transfection
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
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    Coordinated regulation of iron-controlling genes, H-ferritin and IRP2, by c-MYC (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-01-29
    Description: The protein encoded by the c-MYC proto-oncogene is a transcription factor that can both activate and repress the expression of target genes, but few of its transcriptional targets have been identified. Here, c-MYC is shown to repress the expression of the heavy subunit of the protein ferritin (H-ferritin), which sequesters intracellular iron, and to stimulate the expression of the iron regulatory protein-2 (IRP2), which increases the intracellular iron pool. Down-regulation of the expression of H-ferritin gene was required for cell transformation by c-MYC. These results indicate that c-MYC coordinately regulates genes controlling intracellular iron concentrations and that this function is essential for the control of cell proliferation and transformation by c-MYC.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wu, K J -- Polack, A -- Dalla-Favera, R -- CA-37165/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1999 Jan 29;283(5402):676-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Oncology, Department of Pathology, Columbia University, New York, NY 10032, USA. an.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9924025" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Division ; Cell Line ; Cell Line, Transformed ; Cell Transformation, Neoplastic ; DNA/biosynthesis ; Down-Regulation ; Ferritins/*genetics/metabolism ; *Gene Expression Regulation ; Genes, myc ; Homeostasis ; Iron/*metabolism ; Iron Regulatory Protein 2 ; Iron-Regulatory Proteins ; Iron-Sulfur Proteins/*genetics/metabolism ; Proto-Oncogene Proteins c-myc/*physiology ; RNA/metabolism ; RNA-Binding Proteins/*genetics/metabolism ; Receptors, Transferrin/genetics ; Transcription, Genetic ; Transfection
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 3
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    Inhibition of the mitogen-activated protein kinase kinase superfamily by a Yersinia effector (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-09-18
    Description: The bacterial pathogen Yersinia uses a type III secretion system to inject several virulence factors into target cells. One of the Yersinia virulence factors, YopJ, was shown to bind directly to the superfamily of MAPK (mitogen-activated protein kinase) kinases (MKKs) blocking both phosphorylation and subsequent activation of the MKKs. These results explain the diverse activities of YopJ in inhibiting the extracellular signal-regulated kinase, c-Jun amino-terminal kinase, p38, and nuclear factor kappa B signaling pathways, preventing cytokine synthesis and promoting apoptosis. YopJ-related proteins that are found in a number of bacterial pathogens of animals and plants may function to block MKKs so that host signaling responses can be modulated upon infection.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Orth, K -- Palmer, L E -- Bao, Z Q -- Stewart, S -- Rudolph, A E -- Bliska, J B -- Dixon, J E -- 18024/PHS HHS/ -- AI35175/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1999 Sep 17;285(5435):1920-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Chemistry, University of Michigan, Ann Arbor, MI 48109-0606, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10489373" target="_blank"〉PubMed〈/a〉
    Keywords: Bacterial Proteins/*physiology ; Calcium-Calmodulin-Dependent Protein Kinases/*antagonists & inhibitors ; Cell Line ; Enzyme Activation ; Enzyme Inhibitors/*pharmacology ; HeLa Cells ; Humans ; *MAP Kinase Kinase Kinase 1 ; NF-kappa B/metabolism ; Phosphorylation ; Protein Binding ; Protein-Serine-Threonine Kinases/genetics/metabolism ; Recombinant Fusion Proteins/genetics/metabolism ; Transfection ; Virulence ; Yersinia pseudotuberculosis/genetics/metabolism/pathogenicity/*physiology
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 4
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    Role of DNA 5-methylcytosine transferase in cell transformation by fos (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-01-15
    Description: The Fos and Jun oncoproteins form dimeric complexes that stimulate transcription of genes containing activator protein-1 regulatory elements. We found, by representational difference analysis, that expression of DNA 5-methylcytosine transferase (dnmt1) in fos-transformed cells is three times the expression in normal fibroblasts and that fos-transformed cells contain about 20 percent more 5-methylcytosine than normal fibroblasts. Transfection of the gene encoding Dnmt1 induced morphological transformation, whereas inhibition of dnmt1 expression or activity resulted in reversion of fos transformation. Inhibition of histone deacetylase, which associates with methylated DNA, also caused reversion. These results suggest that fos may transform cells through alterations in DNA methylation and in histone deacetylation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bakin, A V -- Curran, T -- P30 CA21765/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1999 Jan 15;283(5400):387-90.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Developmental Neurobiology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9888853" target="_blank"〉PubMed〈/a〉
    Keywords: 5-Methylcytosine ; Acetylation ; Animals ; Cell Size ; *Cell Transformation, Neoplastic ; Cytosine/analogs & derivatives/metabolism ; DNA (Cytosine-5-)-Methyltransferase/genetics/*metabolism ; DNA Methylation ; Enzyme Inhibitors/pharmacology ; Gene Expression Regulation, Neoplastic ; *Genes, fos ; Histone Deacetylase Inhibitors ; Histones/metabolism ; Hydroxamic Acids/pharmacology ; Proto-Oncogene Proteins c-fos/*metabolism ; Rats ; Transcription, Genetic ; Transfection
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 5
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    Efficient persistence of extrachromosomal KSHV DNA mediated by latency-associated nuclear antigen (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-04-24
    Description: Primary effusion lymphoma (PEL) cells harbor Kaposi's sarcoma-associated herpesvirus (KSHV) episomes and express a KSHV-encoded latency-associated nuclear antigen (LANA). In PEL cells, LANA and KSHV DNA colocalized in dots in interphase nuclei and along mitotic chromosomes. In the absence of KSHV DNA, LANA was diffusely distributed in the nucleus or on mitotic chromosomes. In lymphoblasts, LANA was necessary and sufficient for the persistence of episomes containing a specific KSHV DNA fragment. Furthermore, LANA colocalized with the artificial KSHV DNA episomes in nuclei and along mitotic chromosomes. These results support a model in which LANA tethers KSHV DNA to chromosomes during mitosis to enable the efficient segregation of KSHV episomes to progeny cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ballestas, M E -- Chatis, P A -- Kaye, K M -- CA67380-04/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1999 Apr 23;284(5414):641-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, Channing Laboratory, Brigham and Women's Hospital, Harvard Medical School, 181 Longwood Avenue, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10213686" target="_blank"〉PubMed〈/a〉
    Keywords: Antigens, Viral/analysis/genetics/metabolism ; Cell Nucleus/chemistry ; Chromosomes/chemistry/*metabolism ; Cosmids ; DNA, Viral/analysis/genetics/*metabolism ; Herpesvirus 8, Human/*genetics/physiology ; Humans ; Interphase ; Lymphocytes/chemistry ; Microscopy, Confocal ; *Mitosis ; Nuclear Proteins/analysis/genetics/*metabolism ; *Plasmids ; Transfection ; Tumor Cells, Cultured
    Print ISSN: 0036-8075
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  • 6
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    Convergence of transforming growth factor-beta and vitamin D signaling pathways on SMAD transcriptional coactivators (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-02-26
    Description: Cell proliferation and differentiation are regulated by growth regulatory factors such as transforming growth factor-beta (TGF-beta) and the liphophilic hormone vitamin D. TGF-beta causes activation of SMAD proteins acting as coactivators or transcription factors in the nucleus. Vitamin D controls transcription of target genes through the vitamin D receptor (VDR). Smad3, one of the SMAD proteins downstream in the TGF-beta signaling pathway, was found in mammalian cells to act as a coactivator specific for ligand-induced transactivation of VDR by forming a complex with a member of the steroid receptor coactivator-1 protein family in the nucleus. Thus, Smad3 may mediate cross-talk between vitamin D and TGF-beta signaling pathways.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yanagisawa, J -- Yanagi, Y -- Masuhiro, Y -- Suzawa, M -- Watanabe, M -- Kashiwagi, K -- Toriyabe, T -- Kawabata, M -- Miyazono, K -- Kato, S -- New York, N.Y. -- Science. 1999 Feb 26;283(5406):1317-21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute of Molecular and Cellular Biosciences, University of Tokyo, Yayoi, Bunkyo-ku, Tokyo 113-0032, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10037600" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bone Morphogenetic Protein Receptors ; Bone Morphogenetic Proteins/pharmacology ; COS Cells ; Calcitriol/*metabolism/pharmacology ; Cell Nucleus/metabolism ; DNA-Binding Proteins/*metabolism ; Histone Acetyltransferases ; Ligands ; Nuclear Receptor Coactivator 1 ; Phosphorylation ; Receptor Cross-Talk ; Receptors, Calcitriol/*metabolism ; Receptors, Cell Surface/metabolism ; *Receptors, Growth Factor ; Receptors, Retinoic Acid/metabolism ; Receptors, Transforming Growth Factor beta/metabolism ; Recombinant Fusion Proteins/metabolism ; Retinoid X Receptors ; Signal Transduction ; Smad3 Protein ; Trans-Activators/*metabolism ; Transcription Factors/metabolism ; *Transcriptional Activation ; Transfection ; Transforming Growth Factor beta/*metabolism
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  • 7
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    Beta-defensins: linking innate and adaptive immunity through dendritic and T cell CCR6 (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-10-16
    Description: Defensins contribute to host defense by disrupting the cytoplasmic membrane of microorganisms. This report shows that human beta-defensins are also chemotactic for immature dendritic cells and memory T cells. Human beta-defensin was selectively chemotactic for cells stably transfected to express human CCR6, a chemokine receptor preferentially expressed by immature dendritic cells and memory T cells. The beta-defensin-induced chemotaxis was sensitive to pertussis toxin and inhibited by antibodies to CCR6. The binding of iodinated LARC, the chemokine ligand for CCR6, to CCR6-transfected cells was competitively displaced by beta-defensin. Thus, beta-defensins may promote adaptive immune responses by recruiting dendritic and T cells to the site of microbial invasion through interaction with CCR6.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yang, D -- Chertov, O -- Bykovskaia, S N -- Chen, Q -- Buffo, M J -- Shogan, J -- Anderson, M -- Schroder, J M -- Wang, J M -- Howard, O M -- Oppenheim, J J -- N01-CO-56000/CO/NCI NIH HHS/ -- New York, N.Y. -- Science. 1999 Oct 15;286(5439):525-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Molecular Immunoregulation, Division of Basic Sciences, Intramural Research Support Program, SAIC Frederick, National Cancer Institute-Frederick Cancer Research and Development Center, Frederick, MD 21702-1201, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10521347" target="_blank"〉PubMed〈/a〉
    Keywords: Antibodies/immunology ; Binding, Competitive ; Cell Line ; Chemokine CCL20 ; Chemokines, CC/metabolism/pharmacology ; Chemotaxis ; Chemotaxis, Leukocyte ; Defensins ; Dendritic Cells/*immunology ; Humans ; *Immunity, Active ; *Immunity, Innate ; Immunologic Memory ; *Macrophage Inflammatory Proteins ; Pertussis Toxin ; Proteins/pharmacology/*physiology ; Receptors, CCR6 ; Receptors, Chemokine/genetics/*metabolism ; Recombinant Proteins/pharmacology ; T-Lymphocyte Subsets/*immunology ; Transfection ; Virulence Factors, Bordetella/pharmacology ; *beta-Defensins
    Print ISSN: 0036-8075
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  • 8
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    Positive and negative regulation of IkappaB kinase activity through IKKbeta subunit phosphorylation (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-04-09
    Description: IkappaB [inhibitor of nuclear factor kappaB (NF-kappaB)] kinase (IKK) phosphorylates IkappaB inhibitory proteins, causing their degradation and activation of transcription factor NF-kappaB, a master activator of inflammatory responses. IKK is composed of three subunits-IKKalpha and IKKbeta, which are highly similar protein kinases, and IKKgamma, a regulatory subunit. In mammalian cells, phosphorylation of two sites at the activation loop of IKKbeta was essential for activation of IKK by tumor necrosis factor and interleukin-1. Elimination of equivalent sites in IKKalpha, however, did not interfere with IKK activation. Thus, IKKbeta, not IKKalpha, is the target for proinflammatory stimuli. Once activated, IKKbeta autophosphorylated at a carboxyl-terminal serine cluster. Such phosphorylation decreased IKK activity and may prevent prolonged activation of the inflammatory response.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Delhase, M -- Hayakawa, M -- Chen, Y -- Karin, M -- R01 AI43477/AI/NIAID NIH HHS/ -- R37 ES04151/ES/NIEHS NIH HHS/ -- New York, N.Y. -- Science. 1999 Apr 9;284(5412):309-13.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Gene Regulation and Signal Transduction, Department of Pharmacology, University of California, San Diego, 9500 Gilman Drive, La Jolla, CA 92093-0636, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10195894" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Amino Acid Substitution ; Cell Line ; DNA-Binding Proteins/metabolism ; Enzyme Activation ; HeLa Cells ; Helix-Loop-Helix Motifs ; Humans ; I-kappa B Kinase ; I-kappa B Proteins ; Interleukin-1/pharmacology ; Leucine Zippers ; *MAP Kinase Kinase Kinase 1 ; Molecular Sequence Data ; Mutation ; Phosphorylation ; Phosphoserine/metabolism ; Protein-Serine-Threonine Kinases/chemistry/genetics/*metabolism ; Transfection ; Tumor Necrosis Factor-alpha/pharmacology
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 9
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    Bile acids: natural ligands for an orphan nuclear receptor (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-05-21
    Description: Bile acids regulate the transcription of genes that control cholesterol homeostasis through molecular mechanisms that are poorly understood. Physiological concentrations of free and conjugated chenodeoxycholic acid, lithocholic acid, and deoxycholic acid activated the farnesoid X receptor (FXR; NR1H4), an orphan nuclear receptor. As ligands, these bile acids and their conjugates modulated interaction of FXR with a peptide derived from steroid receptor coactivator 1. These results provide evidence for a nuclear bile acid signaling pathway that may regulate cholesterol homeostasis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Parks, D J -- Blanchard, S G -- Bledsoe, R K -- Chandra, G -- Consler, T G -- Kliewer, S A -- Stimmel, J B -- Willson, T M -- Zavacki, A M -- Moore, D D -- Lehmann, J M -- F32 DK09793/DK/NIDDK NIH HHS/ -- R01 DK53366/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1999 May 21;284(5418):1365-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biochemistry, Glaxo Wellcome Research and Development, Research Triangle Park NC, 27709, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10334993" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bile Acids and Salts/chemistry/*metabolism/pharmacology ; Carrier Proteins/metabolism ; Cell Line ; Chenodeoxycholic Acid/*metabolism/pharmacology ; Cholesterol/metabolism ; DNA-Binding Proteins/chemistry/genetics/*metabolism ; Deoxycholic Acid/metabolism/pharmacology ; Histone Acetyltransferases ; Homeostasis ; Humans ; Ligands ; Lithocholic Acid/metabolism/pharmacology ; Mice ; Nuclear Receptor Coactivator 1 ; *Organic Anion Transporters, Sodium-Dependent ; Protein Conformation ; Receptors, Cytoplasmic and Nuclear/chemistry/genetics/*metabolism ; Recombinant Fusion Proteins/metabolism ; Signal Transduction ; Structure-Activity Relationship ; *Symporters ; Transcription Factors/chemistry/genetics/*metabolism ; Transfection
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  • 10
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    Action of DNA repair endonuclease ERCC1/XPF in living cells (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-05-13
    Description: To study the nuclear organization and dynamics of nucleotide excision repair (NER), the endonuclease ERCC1/XPF (for excision repair cross complementation group 1/xeroderma pigmentosum group F) was tagged with green fluorescent protein and its mobility was monitored in living Chinese hamster ovary cells. In the absence of DNA damage, the complex moved freely through the nucleus, with a diffusion coefficient (15 +/- 5 square micrometers per second) consistent with its molecular size. Ultraviolet light-induced DNA damage caused a transient dose-dependent immobilization of ERCC1/XPF, likely due to engagement of the complex in a single repair event. After 4 minutes, the complex regained mobility. These results suggest (i) that NER operates by assembly of individual NER factors at sites of DNA damage rather than by preassembly of holocomplexes and (ii) that ERCC1/XPF participates in repair of DNA damage in a distributive fashion rather than by processive scanning of large genome segments.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Houtsmuller, A B -- Rademakers, S -- Nigg, A L -- Hoogstraten, D -- Hoeijmakers, J H -- Vermeulen, W -- New York, N.Y. -- Science. 1999 May 7;284(5416):958-61.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology (Josephine Nefkens Institute, Erasmus University, Post Office Box 1738, 3000 DR Rotterdam, Netherlands.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10320375" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; CHO Cells ; Cell Line, Transformed ; Cell Nucleus/metabolism ; Cricetinae ; *DNA Damage ; *DNA Repair ; DNA-Binding Proteins/*metabolism ; Diffusion ; Endonucleases/*metabolism ; Fluorescence ; Green Fluorescent Proteins ; HeLa Cells ; Humans ; Luminescent Proteins ; Microscopy, Confocal ; Microscopy, Fluorescence ; Proteins/*metabolism ; Recombinant Fusion Proteins/metabolism ; Transfection ; Ultraviolet Rays
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  • 11
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    Replication of subgenomic hepatitis C virus RNAs in a hepatoma cell line (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-07-03
    Description: An estimated 170 million persons worldwide are infected with hepatitis C virus (HCV), a major cause of chronic liver disease. Despite increasing knowledge of genome structure and individual viral proteins, studies on virus replication and pathogenesis have been hampered by the lack of reliable and efficient cell culture systems. A full-length consensus genome was cloned from viral RNA isolated from an infected human liver and used to construct subgenomic selectable replicons. Upon transfection into a human hepatoma cell line, these RNAs were found to replicate to high levels, permitting metabolic radiolabeling of viral RNA and proteins. This work defines the structure of HCV replicons functional in cell culture and provides the basis for a long-sought cellular system that should allow detailed molecular studies of HCV and the development of antiviral drugs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lohmann, V -- Korner, F -- Koch, J -- Herian, U -- Theilmann, L -- Bartenschlager, R -- New York, N.Y. -- Science. 1999 Jul 2;285(5424):110-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institute for Virology, Johannes-Gutenberg University Mainz, Obere Zahlbacher Strasse 67, 55131 Mainz, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10390360" target="_blank"〉PubMed〈/a〉
    Keywords: Carcinoma, Hepatocellular ; Cloning, Molecular ; Drug Resistance ; *Genome, Viral ; Gentamicins/pharmacology ; Hepacivirus/genetics/*physiology ; Hepatitis C/virology ; Humans ; Liver Neoplasms ; RNA, Viral/*biosynthesis/genetics ; *Replicon ; Transfection ; Tumor Cells, Cultured/*virology ; Viral Nonstructural Proteins/analysis/genetics ; Virus Cultivation ; *Virus Replication
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  • 12
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    Cell survival promoted by the Ras-MAPK signaling pathway by transcription-dependent and -independent mechanisms (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-11-13
    Description: A mechanism by which the Ras-mitogen-activated protein kinase (MAPK) signaling pathway mediates growth factor-dependent cell survival was characterized. The MAPK-activated kinases, the Rsks, catalyzed the phosphorylation of the pro-apoptotic protein BAD at serine 112 both in vitro and in vivo. The Rsk-induced phosphorylation of BAD at serine 112 suppressed BAD-mediated apoptosis in neurons. Rsks also are known to phosphorylate the transcription factor CREB (cAMP response element-binding protein) at serine 133. Activated CREB promoted cell survival, and inhibition of CREB phosphorylation at serine 133 triggered apoptosis. These findings suggest that the MAPK signaling pathway promotes cell survival by a dual mechanism comprising the posttranslational modification and inactivation of a component of the cell death machinery and the increased transcription of pro-survival genes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bonni, A -- Brunet, A -- West, A E -- Datta, S R -- Takasu, M A -- Greenberg, M E -- NIHP30-HD18655/HD/NICHD NIH HHS/ -- P01 HD 24926/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1999 Nov 12;286(5443):1358-62.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Neuroscience, Children's Hospital, and Department of Neurobiology, Harvard Medical School, 300 Longwood Avenue, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10558990" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Apoptosis ; Brain-Derived Neurotrophic Factor/pharmacology ; Carrier Proteins/genetics/metabolism ; *Cell Survival ; Cells, Cultured ; Cerebellum/cytology ; Cyclic AMP Response Element-Binding Protein/metabolism ; Enzyme Activation ; Enzyme Inhibitors/pharmacology ; Flavonoids/pharmacology ; Insulin-Like Growth Factor I/pharmacology ; MAP Kinase Kinase 1 ; *MAP Kinase Signaling System ; Mitogen-Activated Protein Kinase Kinases/antagonists & inhibitors/metabolism ; Mitogen-Activated Protein Kinases/antagonists & inhibitors/metabolism ; Mutation ; Neurons/*cytology/metabolism ; Phosphorylation ; Phosphoserine/metabolism ; *Protein-Serine-Threonine Kinases ; Rats ; Rats, Long-Evans ; Recombinant Fusion Proteins/metabolism ; Ribosomal Protein S6 Kinases/genetics/*metabolism ; *Transcription, Genetic ; Transfection ; bcl-Associated Death Protein ; ras Proteins/metabolism
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  • 13
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    A molecular mechanism for electrical tuning of cochlear hair cells (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-01-08
    Description: Cochlear frequency selectivity in lower vertebrates arises in part from electrical tuning intrinsic to the sensory hair cells. The resonant frequency is determined largely by the gating kinetics of calcium-activated potassium (BK) channels encoded by the slo gene. Alternative splicing of slo from chick cochlea generated kinetically distinct BK channels. Combination with accessory beta subunits slowed the gating kinetics of alpha splice variants but preserved relative differences between them. In situ hybridization showed that the beta subunit is preferentially expressed by low-frequency (apical) hair cells in the avian cochlea. Interaction of beta with alpha splice variants could provide the kinetic range needed for electrical tuning of cochlear hair cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ramanathan, K -- Michael, T H -- Jiang, G J -- Hiel, H -- Fuchs, P A -- DC00276/DC/NIDCD NIH HHS/ -- New York, N.Y. -- Science. 1999 Jan 8;283(5399):215-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for Hearing Sciences, Department of Biomedical Engineering, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9880252" target="_blank"〉PubMed〈/a〉
    Keywords: Alternative Splicing ; Animals ; Calcium/metabolism ; Cell Line ; Electrophysiology ; Gene Expression ; Hair Cells, Auditory/*physiology ; Humans ; In Situ Hybridization ; *Ion Channel Gating ; Kinetics ; Large-Conductance Calcium-Activated Potassium Channel beta Subunits ; Large-Conductance Calcium-Activated Potassium Channels ; Membrane Potentials ; Patch-Clamp Techniques ; Potassium Channels/genetics/*physiology ; *Potassium Channels, Calcium-Activated ; Quail ; RNA, Messenger/genetics/metabolism ; Reverse Transcriptase Polymerase Chain Reaction ; Transfection
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  • 14
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    Erythropoietin receptor activation by a ligand-induced conformation change (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-02-12
    Description: Erythropoietin and other cytokine receptors are thought to be activated through hormone-induced dimerization and autophosphorylation of JAK kinases associated with the receptor intracellular domains. An in vivo protein fragment complementation assay was used to obtain evidence for an alternative mechanism in which unliganded erythropoietin receptor dimers exist in a conformation that prevents activation of JAK2 but then undergo a ligand-induced conformation change that allows JAK2 to be activated. These results are consistent with crystallographic evidence of distinct dimeric configurations for unliganded and ligand-bound forms of the erythropoietin receptor.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Remy, I -- Wilson, I A -- Michnick, S W -- GM49497/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1999 Feb 12;283(5404):990-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Departement de Biochimie, Universite de Montreal, Casier Postal 6128, succursale Centre-ville, Montreal, Quebec, H3C 3J7, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9974393" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; CHO Cells ; COS Cells ; Cricetinae ; Dimerization ; Erythropoietin/metabolism ; Flow Cytometry ; Fluoresceins/metabolism ; Janus Kinase 2 ; Ligands ; Methotrexate/analogs & derivatives/metabolism ; Microscopy, Fluorescence ; Peptides, Cyclic/metabolism ; *Protein Conformation ; Protein-Tyrosine Kinases/metabolism ; *Proto-Oncogene Proteins ; Receptors, Erythropoietin/*chemistry/*metabolism ; Recombinant Fusion Proteins/chemistry/metabolism ; Tetrahydrofolate Dehydrogenase/chemistry/metabolism ; Transfection
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  • 15
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    BRCA1 inhibition of estrogen receptor signaling in transfected cells (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-05-21
    Description: Mutations of the breast cancer susceptibility gene BRCA1 confer increased risk for breast, ovarian, and prostatic cancers, but it is not clear why the mutations are associated with these particular tumor types. In transient transfection assays, BRCA1 was found to inhibit signaling by the ligand-activated estrogen receptor (ER-alpha) through the estrogen-responsive enhancer element and to block the transcriptional activation function AF-2 of ER-alpha. These results raise the possibility that wild-type BRCA1 suppresses estrogen-dependent transcriptional pathways related to mammary epithelial cell proliferation and that loss of this ability contributes to tumorigenesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Fan, S -- Wang, J -- Yuan, R -- Ma, Y -- Meng, Q -- Erdos, M R -- Pestell, R G -- Yuan, F -- Auborn, K J -- Goldberg, I D -- Rosen, E M -- R01-CA75503/CA/NCI NIH HHS/ -- R01-ES09169/ES/NIEHS NIH HHS/ -- New York, N.Y. -- Science. 1999 May 21;284(5418):1354-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Radiation Oncology, Long Island Jewish Medical Center, The Long Island Campus for the Albert Einstein College of Medicine, 270-05 76th Avenue, New Hyde Park, NY 11040, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10334989" target="_blank"〉PubMed〈/a〉
    Keywords: BRCA1 Protein/*physiology ; Breast/cytology ; Breast Neoplasms/etiology ; Cell Division ; Enhancer Elements, Genetic ; Epithelial Cells/cytology ; Estradiol/metabolism ; Estrogen Receptor alpha ; Female ; Genes, BRCA1 ; Genes, Reporter ; Humans ; Ligands ; Male ; Receptors, Estrogen/*metabolism ; *Signal Transduction ; Transcription Factors/metabolism ; *Transcriptional Activation ; Transfection ; Tumor Cells, Cultured
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  • 16
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    Regulation of myosin phosphatase by a specific interaction with cGMP- dependent protein kinase Ialpha (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-11-24
    Description: Contraction and relaxation of smooth muscle are regulated by myosin light-chain kinase and myosin phosphatase through phosphorylation and dephosphorylation of myosin light chains. Cyclic guanosine monophosphate (cGMP)-dependent protein kinase Ialpha (cGKIalpha) mediates physiologic relaxation of vascular smooth muscle in response to nitric oxide and cGMP. It is shown here that cGKIalpha is targeted to the smooth muscle cell contractile apparatus by a leucine zipper interaction with the myosin-binding subunit (MBS) of myosin phosphatase. Uncoupling of the cGKIalpha-MBS interaction prevents cGMP-dependent dephosphorylation of myosin light chain, demonstrating that this interaction is essential to the regulation of vascular smooth muscle cell tone.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Surks, H K -- Mochizuki, N -- Kasai, Y -- Georgescu, S P -- Tang, K M -- Ito, M -- Lincoln, T M -- Mendelsohn, M E -- HL09330/HL/NHLBI NIH HHS/ -- HL55309/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1999 Nov 19;286(5444):1583-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Molecular Cardiology Research Institute and Cardiology Division, Department of Medicine, Tufts University School of Medicine and New England Medical Center, Boston, MA 02111, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10567269" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Motifs ; Amino Acid Substitution ; Animals ; Cells, Cultured ; Cyclic GMP-Dependent Protein Kinase Type I ; Cyclic GMP-Dependent Protein Kinases/chemistry/genetics/*metabolism ; Histones/metabolism ; Humans ; Isoenzymes/chemistry/metabolism ; Leucine Zippers ; Muscle Contraction ; Muscle Relaxation ; Muscle, Smooth, Vascular/*enzymology/physiology ; Mutagenesis, Site-Directed ; Myosin Light Chains/*metabolism ; Myosin-Light-Chain Phosphatase ; Phosphoprotein Phosphatases/chemistry/*metabolism ; Phosphorylation ; Precipitin Tests ; Rats ; Recombinant Fusion Proteins/metabolism ; Substrate Specificity ; Transfection ; Two-Hybrid System Techniques
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  • 17
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    The role of CCR7 in TH1 and TH2 cell localization and delivery of B cell help in vivo (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-12-11
    Description: Subsets of murine CD4+ T cells localize to different areas of the spleen after adoptive transfer. Naive and T helper 1 (TH1) cells, which express the chemokine receptor CCR7, are home to the periarteriolar lymphoid sheath, whereas activated TH2 cells, which lack CCR7, form rings at the periphery of the T cell zones near B cell follicles. Retroviral transduction of TH2 cells with CCR7 forces them to localize in a TH1-like pattern and inhibits their participation in B cell help in vivo but not in vitro. Thus, differential expression of chemokine receptors results in unique cellular migration patterns that are important for effective immune responses.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Randolph, D A -- Huang, G -- Carruthers, C J -- Bromley, L E -- Chaplin, D D -- AI34580/AI/NIAID NIH HHS/ -- T32 GM07200/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1999 Dec 10;286(5447):2159-62.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Allergy and Immunology, Department of Internal Medicine, Center for Immunology, Washington University School of Medicine. Howard Hughes Medical Institute, St. Louis, MO 63110, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10591648" target="_blank"〉PubMed〈/a〉
    Keywords: Adoptive Transfer ; Animals ; B-Lymphocytes/*immunology ; Calcium/metabolism ; Cell Movement ; Lymphocyte Activation ; Mice ; Mice, Inbred BALB C ; Mice, Transgenic ; Ovalbumin/immunology ; Receptors, CCR7 ; Receptors, Chemokine/*immunology/metabolism ; Signal Transduction ; Spleen/*immunology ; Th1 Cells/*immunology/metabolism ; Th2 Cells/*immunology/metabolism ; Transfection
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  • 18
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    Inhibition of the interferon-inducible protein kinase PKR by HCV E2 protein (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-07-03
    Description: Most isolates of hepatitis C virus (HCV) infections are resistant to interferon, the only available therapy, but the mechanism underlying this resistance has not been defined. Here it is shown that the HCV envelope protein E2 contains a sequence identical with phosphorylation sites of the interferon-inducible protein kinase PKR and the translation initiation factor eIF2alpha, a target of PKR. E2 inhibited the kinase activity of PKR and blocked its inhibitory effect on protein synthesis and cell growth. This interaction of E2 and PKR may be one mechanism by which HCV circumvents the antiviral effect of interferon.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Taylor, D R -- Shi, S T -- Romano, P R -- Barber, G N -- Lai, M M -- AI 40038/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1999 Jul 2;285(5424):107-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Microbiology and Immunology and Howard Hughes Medical Institute, University of Southern California, School of Medicine, Los Angeles, CA 90089, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10390359" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Line ; Chloramphenicol O-Acetyltransferase/biosynthesis ; Drug Resistance, Microbial ; Endoplasmic Reticulum/metabolism ; Enzyme Induction ; Eukaryotic Initiation Factor-2/chemistry/metabolism ; HeLa Cells ; *Hepacivirus/drug effects ; Humans ; Interferon-alpha/*pharmacology ; Phosphorylation ; Protein Biosynthesis ; Recombinant Fusion Proteins/metabolism/pharmacology ; Saccharomyces cerevisiae/genetics/growth & development/metabolism ; Transfection ; Transformation, Genetic ; Viral Envelope Proteins/chemistry/metabolism/pharmacology/*physiology ; eIF-2 Kinase/*antagonists & inhibitors/chemistry/metabolism
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  • 19
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    Prevention of constitutive TNF receptor 1 signaling by silencer of death domains (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-01-23
    Description: Tumor necrosis factor receptor type 1 (TNF-R1) contains a cytoplasmic death domain that is required for the signaling of TNF activities such as apoptosis and nuclear factor kappa B (NF-kappaB) activation. Normally, these signals are generated only after TNF-induced receptor aggregation. However, TNF-R1 self-associates and signals independently of ligand when overexpressed. This apparent paradox may be explained by silencer of death domains (SODD), a widely expressed approximately 60-kilodalton protein that was found to be associated with the death domain of TNF-R1. TNF treatment released SODD from TNF-R1, permitting the recruitment of proteins such as TRADD and TRAF2 to the active TNF-R1 signaling complex. SODD also interacted with death receptor-3 (DR3), another member of the TNF receptor superfamily. Thus, SODD association may be representative of a general mechanism for preventing spontaneous signaling by death domain-containing receptors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jiang, Y -- Woronicz, J D -- Liu, W -- Goeddel, D V -- New York, N.Y. -- Science. 1999 Jan 22;283(5401):543-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Tularik, Two Corporate Drive, South San Francisco, CA 94080, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9915703" target="_blank"〉PubMed〈/a〉
    Keywords: *Adaptor Proteins, Signal Transducing ; Amino Acid Sequence ; Antigens, CD/chemistry/genetics/*metabolism ; Apoptosis ; Carrier Proteins/chemistry/genetics/*metabolism ; Cell Line ; Fas-Associated Death Domain Protein ; Humans ; Jurkat Cells ; Molecular Sequence Data ; Mutation ; NF-kappa B/metabolism ; Protein Binding ; Proteins/metabolism ; Receptor Aggregation ; Receptor-Interacting Protein Serine-Threonine Kinases ; Receptors, Tumor Necrosis Factor/chemistry/genetics/*metabolism ; Receptors, Tumor Necrosis Factor, Member 25 ; Receptors, Tumor Necrosis Factor, Type I ; Recombinant Fusion Proteins/metabolism ; *Signal Transduction ; TNF Receptor-Associated Factor 1 ; TNF Receptor-Associated Factor 2 ; Transfection ; Tumor Necrosis Factor-alpha/pharmacology ; U937 Cells
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  • 20
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    Beta-arrestin-dependent formation of beta2 adrenergic receptor-Src protein kinase complexes (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-01-29
    Description: The Ras-dependent activation of mitogen-activated protein (MAP) kinase pathways by many receptors coupled to heterotrimeric guanine nucleotide binding proteins (G proteins) requires the activation of Src family tyrosine kinases. Stimulation of beta2 adrenergic receptors resulted in the assembly of a protein complex containing activated c-Src and the receptor. Src recruitment was mediated by beta-arrestin, which functions as an adapter protein, binding both c-Src and the agonist-occupied receptor. beta-Arrestin 1 mutants, impaired either in c-Src binding or in the ability to target receptors to clathrin-coated pits, acted as dominant negative inhibitors of beta2 adrenergic receptor-mediated activation of the MAP kinases Erk1 and Erk2. These data suggest that beta-arrestin binding, which terminates receptor-G protein coupling, also initiates a second wave of signal transduction in which the "desensitized" receptor functions as a critical structural component of a mitogenic signaling complex.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Luttrell, L M -- Ferguson, S S -- Daaka, Y -- Miller, W E -- Maudsley, S -- Della Rocca, G J -- Lin, F -- Kawakatsu, H -- Owada, K -- Luttrell, D K -- Caron, M G -- Lefkowitz, R J -- DK02352/DK/NIDDK NIH HHS/ -- DK55524/DK/NIDDK NIH HHS/ -- HL16037/HL/NHLBI NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1999 Jan 29;283(5402):655-61.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Department of Medicine, Duke University Medical Center, Durham, NC 27710, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9924018" target="_blank"〉PubMed〈/a〉
    Keywords: Adrenergic beta-Agonists/metabolism/pharmacology ; Animals ; Arrestins/genetics/*metabolism ; Calcium-Calmodulin-Dependent Protein Kinases/metabolism ; Cell Line ; Cell Membrane/metabolism ; Enzyme Activation ; GTP-Binding Proteins/metabolism ; Humans ; Isoproterenol/metabolism/pharmacology ; Mitogen-Activated Protein Kinase 1 ; Mitogen-Activated Protein Kinase 3 ; *Mitogen-Activated Protein Kinases ; Models, Biological ; Phosphorylation ; Point Mutation ; Precipitin Tests ; Proto-Oncogene Proteins pp60(c-src)/*metabolism ; Receptor Cross-Talk ; Receptors, Adrenergic, beta-2/*metabolism ; Receptors, Cell Surface/metabolism ; *Signal Transduction ; Transfection ; src Homology Domains
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  • 21
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    Association of BRCA1 with the hRad50-hMre11-p95 complex and the DNA damage response (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-07-31
    Description: BRCA1 encodes a tumor suppressor that is mutated in familial breast and ovarian cancers. Here, it is shown that BRCA1 interacts in vitro and in vivo with hRad50, which forms a complex with hMre11 and p95/nibrin. Upon irradiation, BRCA1 was detected in discrete foci in the nucleus, which colocalize with hRad50. Formation of irradiation-induced foci positive for BRCA1, hRad50, hMre11, or p95 was dramatically reduced in HCC/1937 breast cancer cells carrying a homozygous mutation in BRCA1 but was restored by transfection of wild-type BRCA1. Ectopic expression of wild-type, but not mutated, BRCA1 in these cells rendered them less sensitive to the DNA damage agent, methyl methanesulfonate. These data suggest that BRCA1 is important for the cellular responses to DNA damage that are mediated by the hRad50-hMre11-p95 complex.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhong, Q -- Chen, C F -- Li, S -- Chen, Y -- Wang, C C -- Xiao, J -- Chen, P L -- Sharp, Z D -- Lee, W H -- CA 30195/CA/NCI NIH HHS/ -- CA 58183/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1999 Jul 30;285(5428):747-50.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Medicine, Institute of Biotechnology, University of Texas Health Science Center at San Antonio, 15355 Lambda Drive, San Antonio, TX 78245, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10426999" target="_blank"〉PubMed〈/a〉
    Keywords: BRCA1 Protein/*metabolism ; Cell Cycle Proteins/*metabolism ; Cell Nucleus/*metabolism ; Cell Survival ; *DNA Damage ; *DNA Repair Enzymes ; DNA-Binding Proteins/*metabolism ; Gamma Rays ; Genes, BRCA1 ; Humans ; Methyl Methanesulfonate/pharmacology ; Mutagens/pharmacology ; Mutation ; *Nuclear Proteins ; Rad51 Recombinase ; Recombination, Genetic ; Transfection ; Tumor Cells, Cultured
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  • 22
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    Identification of a nuclear receptor for bile acids (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-05-21
    Description: Bile acids are essential for the solubilization and transport of dietary lipids and are the major products of cholesterol catabolism. Results presented here show that bile acids are physiological ligands for the farnesoid X receptor (FXR), an orphan nuclear receptor. When bound to bile acids, FXR repressed transcription of the gene encoding cholesterol 7alpha-hydroxylase, which is the rate-limiting enzyme in bile acid synthesis, and activated the gene encoding intestinal bile acid-binding protein, which is a candidate bile acid transporter. These results demonstrate a mechanism by which bile acids transcriptionally regulate their biosynthesis and enterohepatic transport.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Makishima, M -- Okamoto, A Y -- Repa, J J -- Tu, H -- Learned, R M -- Luk, A -- Hull, M V -- Lustig, K D -- Mangelsdorf, D J -- Shan, B -- New York, N.Y. -- Science. 1999 May 21;284(5418):1362-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Department of Pharmacology, University of Texas Southwestern Medical Center, 5323 Harry Hines Boulevard, Dallas, TX 75235-9050, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10334992" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bile Acids and Salts/biosynthesis/*metabolism ; Biological Transport ; Carrier Proteins/*genetics/metabolism ; Cell Line ; Chenodeoxycholic Acid/*metabolism ; Cholesterol/metabolism ; Cholesterol 7-alpha-Hydroxylase/*genetics ; DNA-Binding Proteins/chemistry/genetics/*metabolism ; Gene Expression Regulation ; Histone Acetyltransferases ; Homeostasis ; Humans ; *Hydroxysteroid Dehydrogenases ; Ligands ; Liver/metabolism ; *Membrane Glycoproteins ; Mice ; Nuclear Receptor Coactivator 1 ; *Organic Anion Transporters, Sodium-Dependent ; Receptors, Cytoplasmic and Nuclear/chemistry/genetics/*metabolism ; *Symporters ; Transcription Factors/chemistry/genetics/*metabolism ; Transfection ; Tumor Cells, Cultured
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  • 23
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    Differentiation stage-specific inhibition of the Raf-MEK-ERK pathway by Akt (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-11-27
    Description: Extracellular signals often result in simultaneous activation of both the Raf-MEK-ERK and PI3K-Akt pathways (where ERK is extracellular-regulated kinase, MEK is mitogen-activated protein kinase or ERK kinase, and PI3K is phosphatidylinositol 3-kinase). However, these two signaling pathways were shown to exert opposing effects on muscle cell hypertrophy. Furthermore, the PI3K-Akt pathway was shown to inhibit the Raf-MEK-ERK pathway; this cross-regulation depended on the differentiation state of the cell: Akt activation inhibited the Raf-MEK-ERK pathway in differentiated myotubes, but not in their myoblast precursors. The stage-specific inhibitory action of Akt correlated with its stage-specific ability to form a complex with Raf, suggesting the existence of differentially expressed mediators of an inhibitory Akt-Raf complex.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rommel, C -- Clarke, B A -- Zimmermann, S -- Nunez, L -- Rossman, R -- Reid, K -- Moelling, K -- Yancopoulos, G D -- Glass, D J -- New York, N.Y. -- Science. 1999 Nov 26;286(5445):1738-41.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Regeneron Pharmaceuticals, 777 Old Saw Mill River Road, Tarrytown, NY 10591, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10576741" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Differentiation ; Cell Line ; Cyclin-Dependent Kinase Inhibitor p21 ; Cyclins/genetics ; Enzyme Activation ; Enzyme Inhibitors/pharmacology ; Flavonoids/pharmacology ; Insulin-Like Growth Factor I/pharmacology ; MAP Kinase Signaling System/drug effects ; Mice ; Mitogen-Activated Protein Kinases/*antagonists & inhibitors/metabolism ; Muscle, Skeletal/*cytology/*metabolism ; Myogenin/genetics ; Phenotype ; Phosphatidylinositol 3-Kinases/metabolism ; Phosphorylation ; Protein-Serine-Threonine Kinases/*metabolism ; Proto-Oncogene Proteins/*metabolism ; Proto-Oncogene Proteins c-akt ; Proto-Oncogene Proteins c-raf/*antagonists & inhibitors/metabolism ; Signal Transduction ; Transfection ; Transgenes
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 24
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    Molecular identification of a eukaryotic, stretch-activated nonselective cation channel (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-08-07
    Description: Calcium-permeable, stretch-activated nonselective cation (SA Cat) channels mediate cellular responses to mechanical stimuli. However, genes encoding such channels have not been identified in eukaryotes. The yeast MID1 gene product (Mid1) is required for calcium influx in the yeast Saccharomyces cerevisiae. Functional expression of Mid1 in Chinese hamster ovary cells conferred sensitivity to mechanical stress that resulted in increases in both calcium conductance and the concentration of cytosolic free calcium. These increases were dependent on the presence of extracellular calcium and were reduced by gadolinium, a blocker of SA Cat channels. Single-channel analyses with cell-attached patches revealed that Mid1 acts as a calcium-permeable, cation-selective stretch-activated channel with a conductance of 32 picosiemens at 150 millimolar cesium chloride in the pipette. Thus, Mid1 appears to be a eukaryotic, SA Cat channel.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kanzaki, M -- Nagasawa, M -- Kojima, I -- Sato, C -- Naruse, K -- Sokabe, M -- Iida, H -- New York, N.Y. -- Science. 1999 Aug 6;285(5429):882-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Cell Biology, Institute for Molecular and Cellular Regulation, Gunma University, Maebashi, Gunma 371-8510, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10436155" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; CHO Cells ; Calcium/metabolism ; Calcium Channels/chemistry/genetics/*metabolism ; Cations/*metabolism ; Cell Membrane/metabolism ; Cell Membrane Permeability ; Cesium/metabolism ; Chlorides/pharmacology ; Cricetinae ; Fungal Proteins/chemistry/genetics/*metabolism ; Gadolinium/pharmacology ; Ion Channels/chemistry/genetics/*metabolism ; Membrane Glycoproteins/chemistry/genetics/*metabolism ; Membrane Potentials ; Molecular Sequence Data ; Patch-Clamp Techniques ; Pressure ; Saccharomyces cerevisiae/genetics/metabolism ; *Saccharomyces cerevisiae Proteins ; Stress, Mechanical ; Transfection ; Zinc Compounds/pharmacology
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    UDP-GlcNAc 2-epimerase: a regulator of cell surface sialylation (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-05-21
    Description: Modification of cell surface molecules with sialic acid is crucial for their function in many biological processes, including cell adhesion and signal transduction. Uridine diphosphate-N-acetylglucosamine 2-epimerase (UDP-GlcNAc 2-epimerase) is an enzyme that catalyzes an early, rate-limiting step in the sialic acid biosynthetic pathway. UDP-GlcNAc 2-epimerase was found to be a major determinant of cell surface sialylation in human hematopoietic cell lines and a critical regulator of the function of specific cell surface adhesion molecules.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Keppler, O T -- Hinderlich, S -- Langner, J -- Schwartz-Albiez, R -- Reutter, W -- Pawlita, M -- New York, N.Y. -- Science. 1999 May 21;284(5418):1372-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Applied Tumor Virology Program, Tumor Immunology Program, Deutsches Krebsforschungszentrum, Im Neuenheimer Feld 280, D-69120 Heidelberg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10334995" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD/metabolism ; Antigens, CD14/biosynthesis ; Antigens, CD15/biosynthesis ; Antigens, Differentiation, B-Lymphocyte/metabolism ; Carbohydrate Epimerases/genetics/metabolism ; Cell Adhesion Molecules/metabolism ; Cell Membrane/*metabolism ; Culture Media ; *Escherichia coli Proteins ; Glycoconjugates/*metabolism ; HL-60 Cells ; Histocompatibility Antigens Class I/biosynthesis ; Humans ; Lectins/metabolism ; Oligosaccharides/biosynthesis ; Rats ; Sialic Acid Binding Ig-like Lectin 2 ; Sialic Acids/*biosynthesis ; Transcription, Genetic ; Transfection ; Tumor Cells, Cultured
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 26
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    Light-dependent sequestration of TIMELESS by CRYPTOCHROME (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-07-27
    Description: Most organisms have circadian clocks consisting of negative feedback loops of gene regulation that facilitate adaptation to cycles of light and darkness. In this study, CRYPTOCHROME (CRY), a protein involved in circadian photoperception in Drosophila, is shown to block the function of PERIOD/TIMELESS (PER/TIM) heterodimeric complexes in a light-dependent fashion. TIM degradation does not occur under these conditions; thus, TIM degradation is uncoupled from abrogation of its function by light. CRY and TIM are part of the same complex and directly interact in yeast in a light-dependent fashion. PER/TIM and CRY influence the subcellular distribution of these protein complexes, which reside primarily in the nucleus after the perception of a light signal. Thus, CRY acts as a circadian photoreceptor by directly interacting with core components of the circadian clock.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ceriani, M F -- Darlington, T K -- Staknis, D -- Mas, P -- Petti, A A -- Weitz, C J -- Kay, S A -- MH-51573/MH/NIMH NIH HHS/ -- MH-59943/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1999 Jul 23;285(5427):553-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell Biology and NSF Center for Biological Timing, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10417378" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biological Clocks ; Cell Line ; Cell Nucleus/metabolism ; *Circadian Rhythm ; Cryptochromes ; Cytoplasm/metabolism ; Darkness ; Dimerization ; Drosophila ; *Drosophila Proteins ; *Eye Proteins ; Flavoproteins/genetics/*metabolism ; Green Fluorescent Proteins ; Insect Proteins/genetics/*metabolism ; *Light ; Luminescent Proteins ; Mutation ; Nuclear Proteins/genetics/metabolism ; Period Circadian Proteins ; *Photoreceptor Cells, Invertebrate ; Receptors, G-Protein-Coupled ; Recombinant Fusion Proteins/metabolism ; Transfection ; Yeasts/genetics/metabolism
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 27
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    Transduction of human CD34+ cells that mediate long-term engraftment of NOD/SCID mice by HIV vectors (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-01-29
    Description: Efficient gene transfer into human hematopoietic stem cells (HSCs) is an important goal in the study of the hematopoietic system as well as for gene therapy of hematopoietic disorders. A lentiviral vector based on the human immunodeficiency virus (HIV) was able to transduce human CD34+ cells capable of stable, long-term reconstitution of nonobese diabetic/severe combined immunodeficient (NOD/SCID) mice. High-efficiency transduction occurred in the absence of cytokine stimulation and resulted in transgene expression in multiple lineages of human hematopoietic cells for up to 22 weeks after transplantation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Miyoshi, H -- Smith, K A -- Mosier, D E -- Verma, I M -- Torbett, B E -- CA44360/CA/NCI NIH HHS/ -- DK49886/DK/NIDDK NIH HHS/ -- HL53670/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1999 Jan 29;283(5402):682-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Genetics, Salk Institute for Biological Studies, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9924027" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD34/*analysis ; Bone Marrow Cells/cytology ; Cell Division ; Cell Survival ; Colony-Forming Units Assay ; Gene Expression ; *Gene Transfer Techniques ; *Genetic Vectors ; Green Fluorescent Proteins ; HIV/*genetics ; Hematopoiesis ; *Hematopoietic Stem Cell Transplantation ; *Hematopoietic Stem Cells/cytology/immunology ; Humans ; Leukemia Virus, Murine/genetics ; Luminescent Proteins/genetics ; Mice ; Mice, Inbred NOD ; Mice, SCID ; Promoter Regions, Genetic ; Transfection ; Transgenes
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    HIV vaccines. Magic of the occult? (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-01-30
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Montefiori, D -- Moore, J P -- New York, N.Y. -- Science. 1999 Jan 15;283(5400):336-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Center for AIDS Research, Department of Surgery, Duke University Medical Center, Durham, NC 27710, USA. monte005@mc.duke.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9925493" target="_blank"〉PubMed〈/a〉
    Keywords: AIDS Vaccines/*immunology ; Animals ; COS Cells ; Cell Fusion ; Coculture Techniques ; Epitopes/immunology ; HIV Antibodies/biosynthesis/*immunology ; HIV Antigens/*immunology ; HIV Envelope Protein gp120/immunology ; HIV Envelope Protein gp41/immunology ; HIV-1/*immunology/physiology ; Mice ; Neutralization Tests ; Transfection ; Tumor Cells, Cultured
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 29
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    Light-independent role of CRY1 and CRY2 in the mammalian circadian clock (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-10-26
    Description: Cryptochrome (CRY), a photoreceptor for the circadian clock in Drosophila, binds to the clock component TIM in a light-dependent fashion and blocks its function. In mammals, genetic evidence suggests a role for CRYs within the clock, distinct from hypothetical photoreceptor functions. Mammalian CRY1 and CRY2 are here shown to act as light-independent inhibitors of CLOCK-BMAL1, the activator driving Per1 transcription. CRY1 or CRY2 (or both) showed light-independent interactions with CLOCK and BMAL1, as well as with PER1, PER2, and TIM. Thus, mammalian CRYs act as light-independent components of the circadian clock and probably regulate Per1 transcriptional cycling by contacting both the activator and its feedback inhibitors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Griffin, E A Jr -- Staknis, D -- Weitz, C J -- MH-59943/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1999 Oct 22;286(5440):768-71.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurobiology, Harvard Medical School, Boston, MA 02115 USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10531061" target="_blank"〉PubMed〈/a〉
    Keywords: 3T3 Cells ; ARNTL Transcription Factors ; Animals ; Basic Helix-Loop-Helix Transcription Factors ; *Biological Clocks ; CLOCK Proteins ; Cell Cycle Proteins ; Cells, Cultured ; *Circadian Rhythm ; Cryptochromes ; Dimerization ; *Drosophila Proteins ; *Eye Proteins ; Flavoproteins/metabolism/*physiology ; *Gene Expression Regulation ; Genes, Reporter ; Helix-Loop-Helix Motifs ; Humans ; Intracellular Signaling Peptides and Proteins ; *Light ; Mice ; Nuclear Proteins/antagonists & inhibitors/*genetics/metabolism ; Period Circadian Proteins ; *Photoreceptor Cells, Invertebrate ; Receptors, G-Protein-Coupled ; Trans-Activators/antagonists & inhibitors/metabolism ; Transcription Factors/antagonists & inhibitors/metabolism ; Transcriptional Activation ; Transfection
    Print ISSN: 0036-8075
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    Ca2+-induced apoptosis through calcineurin dephosphorylation of BAD (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-04-09
    Description: The Ca2+-activated protein phosphatase calcineurin induces apoptosis, but the mechanism is unknown. Calcineurin was found to dephosphorylate BAD, a pro-apoptotic member of the Bcl-2 family, thus enhancing BAD heterodimerization with Bcl-xL and promoting apoptosis. The Ca2+-induced dephosphorylation of BAD correlated with its dissociation from 14-3-3 in the cytosol and translocation to mitochondria where Bcl-xL resides. In hippocampal neurons, L-glutamate, an inducer of Ca2+ influx and calcineurin activation, triggered mitochondrial targeting of BAD and apoptosis, which were both suppressible by coexpression of a dominant-inhibitory mutant of calcineurin or pharmacological inhibitors of this phosphatase. Thus, a Ca2+-inducible mechanism for apoptosis induction operates by regulating BAD phosphorylation and localization in cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, H G -- Pathan, N -- Ethell, I M -- Krajewski, S -- Yamaguchi, Y -- Shibasaki, F -- McKeon, F -- Bobo, T -- Franke, T F -- Reed, J C -- AG-1593/AG/NIA NIH HHS/ -- CA-69381/CA/NCI NIH HHS/ -- HD25938/HD/NICHD NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1999 Apr 9;284(5412):339-43.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Burnham Institute, 10901 North Torrey Pines Road, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10195903" target="_blank"〉PubMed〈/a〉
    Keywords: 14-3-3 Proteins ; Animals ; *Apoptosis ; Calcineurin/genetics/*metabolism ; Calcineurin Inhibitors ; Calcium/*metabolism/pharmacology ; Carrier Proteins/chemistry/*metabolism ; Cell Line ; Cells, Cultured ; Dimerization ; Enzyme Inhibitors/pharmacology ; Glutamic Acid/pharmacology ; Hippocampus/cytology ; Humans ; Mitochondria/metabolism ; Neurons/cytology/metabolism ; Phosphorylation ; Protein-Serine-Threonine Kinases/metabolism ; Proteins/metabolism ; Proto-Oncogene Proteins c-bcl-2/metabolism ; Rats ; Recombinant Fusion Proteins/metabolism ; Transfection ; *Tyrosine 3-Monooxygenase ; bcl-Associated Death Protein ; bcl-X Protein
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Cloning genes encoding MHC class II-restricted antigens: mutated CDC27 as a tumor antigen (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-05-21
    Description: In an effort to identify tumor-specific antigens recognized by CD4(+) T cells, an approach was developed that allows the screening of an invariant chain-complementary DNA fusion library in a genetically engineered cell line expressing the essential components of the major histocompatibility complex (MHC) class II processing and presentation pathway. This led to the identification of a mutated form of human CDC27, which gave rise to an HLA-DR4-restricted melanoma antigen. A mutated form of triosephosphate isomerase, isolated by a biochemical method, was also identified as an HLA-DR1-restricted antigen. Thus, this approach may be generally applicable to the identification of antigens recognized by CD4(+) T cells, which could aid the development of strategies for the treatment of patients with cancer, autoimmune diseases, or infectious diseases.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, R F -- Wang, X -- Atwood, A C -- Topalian, S L -- Rosenberg, S A -- New York, N.Y. -- Science. 1999 May 21;284(5418):1351-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Surgery Branch, National Cancer Institute, National Institutes of Health, Building 10/2B42, 9000 Rockville Pike, Bethesda, MD 20892, USA. rongfu@pop.nci.nih.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10334988" target="_blank"〉PubMed〈/a〉
    Keywords: Antigen Presentation ; Antigens, Differentiation, B-Lymphocyte/genetics/immunology ; Antigens, Neoplasm/*immunology ; Apc3 Subunit, Anaphase-Promoting Complex-Cyclosome ; CD4-Positive T-Lymphocytes/immunology ; Cell Cycle Proteins/*genetics/*immunology ; Cell Line, Transformed ; *Cloning, Molecular ; Epitopes/immunology ; HLA-DR1 Antigen/immunology ; HLA-DR4 Antigen/immunology ; Histocompatibility Antigens Class II/genetics/*immunology ; Humans ; Lymphocytes, Tumor-Infiltrating/*immunology ; Melanoma/immunology ; Point Mutation ; Recombinant Fusion Proteins ; Transfection ; Triose-Phosphate Isomerase/genetics/immunology
    Print ISSN: 0036-8075
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    Stimulation of bone formation in vitro and in rodents by statins (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-12-03
    Description: Osteoporosis and other diseases of bone loss are a major public health problem. Here it is shown that the statins, drugs widely used for lowering serum cholesterol, also enhance new bone formation in vitro and in rodents. This effect was associated with increased expression of the bone morphogenetic protein-2 (BMP-2) gene in bone cells. Lovastatin and simvastatin increased bone formation when injected subcutaneously over the calvaria of mice and increased cancellous bone volume when orally administered to rats. Thus, in appropriate doses, statins may have therapeutic applications for the treatment of osteoporosis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mundy, G -- Garrett, R -- Harris, S -- Chan, J -- Chen, D -- Rossini, G -- Boyce, B -- Zhao, M -- Gutierrez, G -- New York, N.Y. -- Science. 1999 Dec 3;286(5446):1946-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉OsteoScreen, 2040 Babcock Road, San Antonio, TX 78229, USA. mundy@uthscsa.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10583956" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bone Density/*drug effects ; Bone Morphogenetic Protein 2 ; Bone Morphogenetic Proteins/biosynthesis/genetics/pharmacology ; Cell Line ; Female ; Fibroblast Growth Factor 1 ; Fibroblast Growth Factor 2/pharmacology ; Humans ; Hydroxymethylglutaryl-CoA Reductase Inhibitors/pharmacology ; Lovastatin/*pharmacology ; Male ; Mice ; Mice, Inbred ICR ; Organ Culture Techniques ; Osteoblasts/*drug effects/metabolism ; Osteoclasts/drug effects ; Osteogenesis/*drug effects ; Osteoporosis/drug therapy ; Ovariectomy ; Promoter Regions, Genetic/drug effects ; Rats ; Recombinant Proteins/pharmacology ; Simvastatin/*pharmacology ; Skull ; Transfection ; *Transforming Growth Factor beta
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 33
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    Regulation of beta-catenin signaling by the B56 subunit of protein phosphatase 2A (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-03-26
    Description: Dysregulation of Wnt-beta-catenin signaling disrupts axis formation in vertebrate embryos and underlies multiple human malignancies. The adenomatous polyposis coli (APC) protein, axin, and glycogen synthase kinase 3beta form a Wnt-regulated signaling complex that mediates the phosphorylation-dependent degradation of beta-catenin. A protein phosphatase 2A (PP2A) regulatory subunit, B56, interacted with APC in the yeast two-hybrid system. Expression of B56 reduced the abundance of beta-catenin and inhibited transcription of beta-catenin target genes in mammalian cells and Xenopus embryo explants. The B56-dependent decrease in beta-catenin was blocked by oncogenic mutations in beta-catenin or APC, and by proteasome inhibitors. B56 may direct PP2A to dephosphorylate specific components of the APC-dependent signaling complex and thereby inhibit Wnt signaling.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Seeling, J M -- Miller, J R -- Gil, R -- Moon, R T -- White, R -- Virshup, D M -- 3P30CA42014/CA/NCI NIH HHS/ -- R01 CA71074/CA/NCI NIH HHS/ -- T32CA09602/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1999 Mar 26;283(5410):2089-91.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Oncological Sciences, Huntsman Cancer Institute, University of Utah, Salt Lake City, UT 84132, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10092233" target="_blank"〉PubMed〈/a〉
    Keywords: Adenomatous Polyposis Coli Protein ; Animals ; Calcium-Calmodulin-Dependent Protein Kinases/metabolism ; Cell Line ; Cysteine Endopeptidases/metabolism ; Cysteine Proteinase Inhibitors/pharmacology ; Cytoskeletal Proteins/genetics/*metabolism ; Down-Regulation ; Genes, Reporter ; Glycogen Synthase Kinase 3 ; Glycogen Synthase Kinases ; Humans ; Leupeptins/pharmacology ; Multienzyme Complexes/metabolism ; Mutation ; Phosphoprotein Phosphatases/chemistry/genetics/*metabolism ; Phosphorylation ; Proteasome Endopeptidase Complex ; Protein Phosphatase 2 ; Proto-Oncogene Proteins/*metabolism ; *Signal Transduction ; *Trans-Activators ; Transcriptional Activation ; Transfection ; Tumor Cells, Cultured ; Wnt Proteins ; Xenopus ; Xenopus Proteins ; *Zebrafish Proteins ; beta Catenin
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Cell activation and apoptosis by bacterial lipoproteins through toll-like receptor-2 (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-07-31
    Description: Apoptosis is implicated in the generation and resolution of inflammation in response to bacterial pathogens. All bacterial pathogens produce lipoproteins (BLPs), which trigger the innate immune response. BLPs were found to induce apoptosis in THP-1 monocytic cells through human Toll-like receptor-2 (hTLR2). BLPs also initiated apoptosis in an epithelial cell line transfected with hTLR2. In addition, BLPs stimulated nuclear factor-kappaB, a transcriptional activator of multiple host defense genes, and activated the respiratory burst through hTLR2. Thus, hTLR2 is a molecular link between microbial products, apoptosis, and host defense mechanisms.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Aliprantis, A O -- Yang, R B -- Mark, M R -- Suggett, S -- Devaux, B -- Radolf, J D -- Klimpel, G R -- Godowski, P -- Zychlinsky, A -- AI 37720-04/AI/NIAID NIH HHS/ -- AI-38894/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1999 Jul 30;285(5428):736-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Skirball Institute and Department of Microbiology, New York University School of Medicine, 540 First Avenue, New York, NY 10016, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10426996" target="_blank"〉PubMed〈/a〉
    Keywords: Antibodies, Monoclonal ; Antigens, CD14/analysis ; *Apoptosis ; Bacterial Proteins/metabolism/*pharmacology ; Cell Line/metabolism ; Cycloheximide/pharmacology ; Cytotoxicity, Immunologic ; *Drosophila Proteins ; Genes, Reporter ; Humans ; Lipopolysaccharides/immunology ; Lipoproteins/metabolism/*pharmacology ; Membrane Glycoproteins/immunology/*metabolism ; Monocytes/*cytology/immunology/metabolism ; NF-kappa B/metabolism ; Protein Synthesis Inhibitors/pharmacology ; Reactive Oxygen Species/metabolism ; Receptors, Cell Surface/immunology/*metabolism ; Signal Transduction ; Tetradecanoylphorbol Acetate/pharmacology ; Toll-Like Receptor 2 ; Toll-Like Receptors ; Transfection ; Tumor Cells, Cultured
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    STAT5 interaction with the T cell receptor complex and stimulation of T cell proliferation (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-01-08
    Description: The role of STAT (signal transducer and activator of transcription) proteins in T cell receptor (TCR) signaling was analyzed. STAT5 became immediately and transiently phosphorylated on tyrosine 694 in response to TCR stimulation. Expression of the protein tyrosine kinase Lck, a key signaling protein in the TCR complex, activated DNA binding of transfected STAT5A and STAT5B to specific STAT inducible elements. The role of Lck in STAT5 activation was confirmed in a Lck-deficient T cell line in which the activation of STAT5 by TCR stimulation was abolished. Expression of Lck induced specific interaction of STAT5 with the subunits of the TCR, indicating that STAT5 may be directly involved in TCR signaling. Stimulation of T cell clones and primary T cell lines also induced the association of STAT5 with the TCR complex. Inhibition of STAT5 function by expression of a dominant negative mutant STAT5 reduced antigen-stimulated proliferation of T cells. Thus, TCR stimulation appears to directly activate STAT5, which may participate in the regulation of gene transcription and T cell proliferation during immunological responses.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Welte, T -- Leitenberg, D -- Dittel, B N -- al-Ramadi, B K -- Xie, B -- Chin, Y E -- Janeway, C A Jr -- Bothwell, A L -- Bottomly, K -- Fu, X Y -- AI34522/AI/NIAID NIH HHS/ -- GM46367/GM/NIGMS NIH HHS/ -- GM55590/GM/NIGMS NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1999 Jan 8;283(5399):222-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, Yale University School of Medicine, New Haven, CT 06520, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9880255" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies ; Antigen-Presenting Cells/immunology ; Antigens/immunology ; Cell Division ; Cell Line ; DNA-Binding Proteins/genetics/*metabolism ; Interferon-gamma/pharmacology ; Interleukin-2/pharmacology ; *Lymphocyte Activation ; Lymphocyte Specific Protein Tyrosine Kinase p56(lck)/genetics/metabolism ; Membrane Proteins/genetics/immunology/metabolism ; Mice ; Mice, Transgenic ; *Milk Proteins ; Phosphorylation ; Phosphotyrosine/metabolism ; Receptors, Antigen, T-Cell/genetics/immunology/*metabolism ; STAT5 Transcription Factor ; Signal Transduction ; T-Lymphocytes, Helper-Inducer/cytology/*immunology/metabolism ; Th2 Cells/immunology/metabolism ; Trans-Activators/genetics/*metabolism ; Transfection
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 36
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    Tbx5 and the retinotectum projection (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-12-30
    Description: Dorsal and ventral aspects of the eye are distinct from the early stages of development. The developing eye cup grows dorsally, and the choroidal fissure is formed on its ventral side. Retinal axons from the dorsal and ventral retina project to the ventral and dorsal tectum, respectively. Misexpression of the Tbx5 gene induced dorsalization of the ventral side of the eye and altered projections of retinal ganglion cell axons. Thus, Tbx5 is involved in eye morphogenesis and is a topographic determinant of the visual projections between retina and tectum.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Koshiba-Takeuchi, K -- Takeuchi, J K -- Matsumoto, K -- Momose, T -- Uno, K -- Hoepker, V -- Ogura, K -- Takahashi, N -- Nakamura, H -- Yasuda, K -- Ogura, T -- New York, N.Y. -- Science. 2000 Jan 7;287(5450):134-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Graduate School of Biological Sciences, Nara Institute of Science and Technology, 8916-5, Takayama, Ikoma, Nara, Japan 630-0101.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10615048" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Avian Proteins ; Axons/*ultrastructure ; Body Patterning ; Bone Morphogenetic Protein 4 ; Bone Morphogenetic Proteins/genetics/physiology ; Chick Embryo ; DNA-Binding Proteins/genetics ; Electroporation ; Ephrin-B1 ; Ephrin-B2 ; Eye/*embryology ; Gene Expression ; Homeodomain Proteins/genetics ; Membrane Proteins/genetics/physiology ; Morphogenesis ; PAX2 Transcription Factor ; Pigment Epithelium of Eye/embryology/metabolism ; Retina/*embryology/metabolism ; Retinal Ganglion Cells/ultrastructure ; Superior Colliculi/*embryology ; T-Box Domain Proteins/genetics/*physiology ; Transcription Factors/genetics ; Transfection ; Transgenes
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    A mammalian H+ channel generated through alternative splicing of the NADPH oxidase homolog NOH-1 (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-12-30
    Description: Voltage-gated proton (H+) channels are found in many human and animal tissues and play an important role in cellular defense against acidic stress. However, a molecular identification of these unique ion conductances has so far not been achieved. A 191-amino acid protein is described that, upon heterologous expression, has properties indistinguishable from those of native H+ channels. This protein is generated through alternative splicing of messenger RNA derived from the gene NOH-1 (NADPH oxidase homolog 1, where NADPH is the reduced form of nicotinamide adenine dinucleotide phosphate).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Banfi, B -- Maturana, A -- Jaconi, S -- Arnaudeau, S -- Laforge, T -- Sinha, B -- Ligeti, E -- Demaurex, N -- Krause, K H -- New York, N.Y. -- Science. 2000 Jan 7;287(5450):138-42.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biology of Aging Laboratory, Department of Geriatrics, Geneva University Hospitals, Geneva Medical School, CH-1211 Geneva 4, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10615049" target="_blank"〉PubMed〈/a〉
    Keywords: *Alternative Splicing ; Amino Acid Sequence ; Cell Line ; Cytosol/metabolism ; Electric Conductivity ; Electron Transport ; Expressed Sequence Tags ; Humans ; Hydrogen/*metabolism ; Hydrogen-Ion Concentration ; Ion Channel Gating ; Ion Channels/chemistry/*genetics/metabolism ; Membrane Glycoproteins/chemistry/*genetics ; Molecular Sequence Data ; NADPH Oxidase/chemistry/*genetics ; Patch-Clamp Techniques ; Protons ; Transfection ; Tumor Cells, Cultured ; Zinc/pharmacology
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Lentiviral vectors--the promise of gene therapy within reach? (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-08-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Amado, R G -- Chen, I S -- New York, N.Y. -- Science. 1999 Jul 30;285(5428):674-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Immunology, UCLA School of Medicine and UCLA AIDS Institute, Los Angeles, CA 90095, USA. ramado@ucla.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10454923" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; *Gene Transfer Techniques ; Genes, Viral ; *Genetic Therapy ; *Genetic Vectors ; HIV/*genetics/physiology ; HIV Infections/therapy/virology ; Hematopoietic Stem Cell Transplantation ; Hematopoietic Stem Cells/cytology/physiology ; Humans ; Lentivirus/*genetics/physiology ; Mutagenesis, Insertional ; Plasmids ; Recombination, Genetic ; Retinitis Pigmentosa/therapy ; Transfection ; Virus Replication
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 39
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    Regulation of NMDA receptors by an associated phosphatase-kinase signaling complex (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-07-03
    Description: Regulation of N-methyl-D-aspartate (NMDA) receptor activity by kinases and phosphatases contributes to the modulation of synaptic transmission. Targeting of these enzymes near the substrate is proposed to enhance phosphorylation-dependent modulation. Yotiao, an NMDA receptor-associated protein, bound the type I protein phosphatase (PP1) and the adenosine 3',5'-monophosphate (cAMP)-dependent protein kinase (PKA) holoenzyme. Anchored PP1 was active, limiting channel activity, whereas PKA activation overcame constitutive PP1 activity and conferred rapid enhancement of NMDA receptor currents. Hence, yotiao is a scaffold protein that physically attaches PP1 and PKA to NMDA receptors to regulate channel activity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Westphal, R S -- Tavalin, S J -- Lin, J W -- Alto, N M -- Fraser, I D -- Langeberg, L K -- Sheng, M -- Scott, J D -- F32 NS010202/NS/NINDS NIH HHS/ -- GM 48231/GM/NIGMS NIH HHS/ -- NS10202/NS/NINDS NIH HHS/ -- NS10543/NS/NINDS NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1999 Jul 2;285(5424):93-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Vollum Institute, Oregon Health Sciences University, 3181 S.W. Sam Jackson Road, Portland, OR 97201, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10390370" target="_blank"〉PubMed〈/a〉
    Keywords: A Kinase Anchor Proteins ; *Adaptor Proteins, Signal Transducing ; Amino Acid Sequence ; Animals ; Binding Sites ; Carrier Proteins/*metabolism ; Cell Line ; Cyclic AMP/analogs & derivatives/pharmacology ; Cyclic AMP-Dependent Protein Kinases/*metabolism ; Cytoskeletal Proteins/*metabolism ; Enzyme Inhibitors/pharmacology ; Holoenzymes/metabolism ; Humans ; Molecular Sequence Data ; Okadaic Acid/pharmacology ; Patch-Clamp Techniques ; Peptide Fragments/pharmacology ; Phosphoprotein Phosphatases/*metabolism ; Phosphorylation ; Rats ; Receptors, N-Methyl-D-Aspartate/*metabolism ; Recombinant Fusion Proteins/metabolism ; Signal Transduction ; Thionucleotides/pharmacology ; Transfection
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 40
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    Activation of NK cells and T cells by NKG2D, a receptor for stress-inducible MICA (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-07-31
    Description: Stress-inducible MICA, a distant homolog of major histocompatibility complex (MHC) class I, functions as an antigen for gammadelta T cells and is frequently expressed in epithelial tumors. A receptor for MICA was detected on most gammadelta T cells, CD8+ alphabeta T cells, and natural killer (NK) cells and was identified as NKG2D. Effector cells from all these subsets could be stimulated by ligation of NKG2D. Engagement of NKG2D activated cytolytic responses of gammadelta T cells and NK cells against transfectants and epithelial tumor cells expressing MICA. These results define an activating immunoreceptor-MHC ligand interaction that may promote antitumor NK and T cell responses.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bauer, S -- Groh, V -- Wu, J -- Steinle, A -- Phillips, J H -- Lanier, L L -- Spies, T -- P01 CA18221/CA/NCI NIH HHS/ -- R01 AI30581/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1999 Jul 30;285(5428):727-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Fred Hutchinson Cancer Research Center, Clinical Research Division, 1100 Fairview Avenue North, Seattle, WA 98109, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10426993" target="_blank"〉PubMed〈/a〉
    Keywords: Cytotoxicity, Immunologic ; Histocompatibility Antigens Class I/*immunology/metabolism ; Humans ; Jurkat Cells ; Killer Cells, Natural/*immunology ; Ligands ; *Lymphocyte Activation ; Lymphocyte Subsets/immunology ; Membrane Proteins/metabolism ; NK Cell Lectin-Like Receptor Subfamily K ; Receptors, Antigen, T-Cell, gamma-delta/immunology ; Receptors, Immunologic/chemistry/genetics/*immunology/metabolism ; Receptors, Natural Killer Cell ; Signal Transduction ; T-Lymphocytes/*immunology ; Transfection ; Tumor Cells, Cultured
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Neuronal activity-dependent cell survival mediated by transcription factor MEF2 (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-10-26
    Description: During mammalian development, electrical activity promotes the calcium-dependent survival of neurons that have made appropriate synaptic connections. However, the mechanisms by which calcium mediates neuronal survival during development are not well characterized. A transcription-dependent mechanism was identified by which calcium influx into neurons promoted cell survival. The transcription factor MEF2 was selectively expressed in newly generated postmitotic neurons and was required for the survival of these neurons. Calcium influx into cerebellar granule neurons led to activation of p38 mitogen-activated protein kinase-dependent phosphorylation and activation of MEF2. Once activated, MEF2 regulated neuronal survival by stimulating MEF2-dependent gene transcription. These findings demonstrate that MEF2 is a calcium-regulated transcription factor and define a function for MEF2 during nervous system development that is distinct from previously well-characterized functions of MEF2 during muscle differentiation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mao, Z -- Bonni, A -- Xia, F -- Nadal-Vicens, M -- Greenberg, M E -- 5T32NS07112/NS/NINDS NIH HHS/ -- NS28829/NS/NINDS NIH HHS/ -- P30-HD18655/HD/NICHD NIH HHS/ -- New York, N.Y. -- Science. 1999 Oct 22;286(5440):785-90.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Neuroscience, Department of Neurology, Children's Hospital and Department of Neurobiology, Harvard Medical School, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10531066" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Apoptosis ; Calcium/metabolism ; Calcium Channels, L-Type/metabolism ; Cell Differentiation ; Cell Survival ; Cells, Cultured ; Cerebellum/cytology/metabolism ; Cerebral Cortex/cytology/embryology/metabolism ; DNA-Binding Proteins/genetics/*metabolism ; Dimerization ; Immunohistochemistry ; MEF2 Transcription Factors ; Mitogen-Activated Protein Kinases/metabolism ; Mitosis ; Mutation ; Myogenic Regulatory Factors ; Neurons/*cytology/*metabolism ; Phosphorylation ; Rats ; Signal Transduction ; Transcription Factors/genetics/*metabolism ; *Transcription, Genetic ; Transfection ; p38 Mitogen-Activated Protein Kinases
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Negative feedback regulation of TGF-beta signaling by the SnoN oncoprotein (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-10-26
    Description: Smad proteins mediate transforming growth factor-beta (TGF-beta) signaling to regulate cell growth and differentiation. The SnoN oncoprotein was found to interact with Smad2 and Smad4 and to repress their abilities to activate transcription through recruitment of the transcriptional corepressor N-CoR. Immediately after TGF-beta stimulation, SnoN is rapidly degraded by the nuclear accumulation of Smad3, allowing the activation of TGF-beta target genes. By 2 hours, TGF-beta induces a marked increase in SnoN expression, resulting in termination of Smad-mediated transactivation. Thus, SnoN maintains the repressed state of TGF-beta-responsive genes in the absence of ligand and participates in negative feedback regulation of TGF-beta signaling.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stroschein, S L -- Wang, W -- Zhou, S -- Zhou, Q -- Luo, K -- New York, N.Y. -- Science. 1999 Oct 22;286(5440):771-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Life Sciences Division, Lawrence Berkeley National Laboratory, and Department of Molecular and Cell Biology, University of California, Berkeley, 229 Stanley Hall, Mail Code 3206, Berkeley, CA 94720, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10531062" target="_blank"〉PubMed〈/a〉
    Keywords: Cell Division ; Cell Line ; Cell Nucleus/metabolism ; DNA/metabolism ; DNA-Binding Proteins/genetics/metabolism ; Feedback ; *Gene Expression Regulation ; Humans ; Intracellular Signaling Peptides and Proteins ; Nuclear Proteins/metabolism ; Nuclear Receptor Co-Repressor 1 ; Promoter Regions, Genetic ; Proto-Oncogene Proteins/genetics/*metabolism ; Repressor Proteins/metabolism ; *Signal Transduction ; Smad2 Protein ; Smad3 Protein ; Smad4 Protein ; Trans-Activators/genetics/metabolism ; Transcription Factors/genetics/*metabolism ; Transcriptional Activation ; Transfection ; Transforming Growth Factor beta/*metabolism ; Tumor Cells, Cultured
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    Processing of the notch ligand delta by the metalloprotease Kuzbanian (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-01-05
    Description: Signaling by the Notch surface receptor controls cell fate determination in a broad spectrum of tissues. This signaling is triggered by the interaction of the Notch protein with what, so far, have been thought to be transmembrane ligands expressed on adjacent cells. Here biochemical and genetic analyses show that the ligand Delta is cleaved on the surface, releasing an extracellular fragment capable of binding to Notch and acting as an agonist of Notch activity. The ADAM disintegrin metalloprotease Kuzbanian is required for this processing event. These observations raise the possibility that Notch signaling in vivo is modulated by soluble forms of the Notch ligands.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Qi, H -- Rand, M D -- Wu, X -- Sestan, N -- Wang, W -- Rakic, P -- Xu, T -- Artavanis-Tsakonas, S -- NS14841/NS/NINDS NIH HHS/ -- NS26084/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1999 Jan 1;283(5398):91-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Yale University School of Medicine, Boyer Center for Molecular Medicine, 295 Congress Avenue, New Haven, CT 06536-0812, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9872749" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Cell Line ; Cells, Cultured ; Disintegrins/genetics/*metabolism ; Drosophila/embryology/genetics/metabolism ; *Drosophila Proteins ; Female ; Intracellular Signaling Peptides and Proteins ; Ligands ; Male ; Membrane Proteins/genetics/*metabolism ; Metalloendopeptidases/genetics/*metabolism ; Molecular Sequence Data ; Mutation ; Neurons/cytology ; Protein Processing, Post-Translational ; Receptors, Notch ; Signal Transduction ; Transfection
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  • 44
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    Host defense mechanisms triggered by microbial lipoproteins through toll-like receptors (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-07-31
    Description: The generation of cell-mediated immunity against many infectious pathogens involves the production of interleukin-12 (IL-12), a key signal of the innate immune system. Yet, for many pathogens, the molecules that induce IL-12 production by macrophages and the mechanisms by which they do so remain undefined. Here it is shown that microbial lipoproteins are potent stimulators of IL-12 production by human macrophages, and that induction is mediated by Toll-like receptors (TLRs). Several lipoproteins stimulated TLR-dependent transcription of inducible nitric oxide synthase and the production of nitric oxide, a powerful microbicidal pathway. Activation of TLRs by microbial lipoproteins may initiate innate defense mechanisms against infectious pathogens.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brightbill, H D -- Libraty, D H -- Krutzik, S R -- Yang, R B -- Belisle, J T -- Bleharski, J R -- Maitland, M -- Norgard, M V -- Plevy, S E -- Smale, S T -- Brennan, P J -- Bloom, B R -- Godowski, P J -- Modlin, R L -- New York, N.Y. -- Science. 1999 Jul 30;285(5428):732-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Immunology, Howard Hughes Medical Institute, University of California Los Angeles School of Medicine, Los Anges, CA 90095, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10426995" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, Bacterial/chemistry/*immunology/metabolism ; Cell Line ; *Drosophila Proteins ; Gene Expression Regulation ; Humans ; Interleukin-12/*biosynthesis/genetics ; Lipopolysaccharides/immunology ; Lipoproteins/chemistry/*immunology/metabolism ; Macrophages/*immunology/metabolism ; Membrane Glycoproteins/*metabolism ; Mice ; Monocytes/*immunology/metabolism ; Mycobacterium tuberculosis/*immunology ; NF-kappa B/biosynthesis ; Nitric Oxide Synthase/genetics ; Nitric Oxide Synthase Type II ; Promoter Regions, Genetic ; Receptors, Cell Surface/*metabolism ; Signal Transduction ; Toll-Like Receptors ; Transcription, Genetic ; Transfection ; Tumor Cells, Cultured
    Print ISSN: 0036-8075
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  • 45
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    Synergy between tumor suppressor APC and the beta-catenin-Tcf4 target Tcf1 (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-09-18
    Description: Mutations in APC or beta-catenin inappropriately activate the transcription factor Tcf4, thereby transforming intestinal epithelial cells. Here it is shown that one of the target genes of Tcf4 in epithelial cells is Tcf1. The most abundant Tcf1 isoforms lack a beta-catenin interaction domain. Tcf1(-/-) mice develop adenomas in the gut and mammary glands. Introduction of a mutant APC allele into these mice substantially increases the number of these adenomas. Tcf1 may act as a feedback repressor of beta-catenin-Tcf4 target genes and thus may cooperate with APC to suppress malignant transformation of epithelial cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Roose, J -- Huls, G -- van Beest, M -- Moerer, P -- van der Horn, K -- Goldschmeding, R -- Logtenberg, T -- Clevers, H -- New York, N.Y. -- Science. 1999 Sep 17;285(5435):1923-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Immunology and Center for Biomedical Genetics, Department of Pathology, University Medical Center Utrecht, Post Office Box 85500, 3508 GA Utrecht, Netherlands.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10489374" target="_blank"〉PubMed〈/a〉
    Keywords: Adenoma/genetics/metabolism/pathology ; Adenomatous Polyposis Coli Protein ; Animals ; Cytoskeletal Proteins/*metabolism ; DNA-Binding Proteins/*genetics/metabolism ; Female ; Gene Expression Regulation, Neoplastic ; Genes, Tumor Suppressor ; Hepatocyte Nuclear Factor 1-alpha ; Humans ; Intestinal Neoplasms/genetics/metabolism/pathology ; Lymphoid Enhancer-Binding Factor 1 ; Male ; Mammary Neoplasms, Experimental/genetics/metabolism/pathology ; Mice ; Neoplasm Proteins/metabolism ; Promoter Regions, Genetic ; T Cell Transcription Factor 1 ; TCF Transcription Factors ; *Trans-Activators ; Transcription Factor 7-Like 2 Protein ; Transcription Factors/*genetics/*metabolism ; Transfection ; Tumor Cells, Cultured ; beta Catenin
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    Beta-secretase cleavage of Alzheimer's amyloid precursor protein by the transmembrane aspartic protease BACE (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-10-26
    Description: Cerebral deposition of amyloid beta peptide (Abeta) is an early and critical feature of Alzheimer's disease. Abeta generation depends on proteolytic cleavage of the amyloid precursor protein (APP) by two unknown proteases: beta-secretase and gamma-secretase. These proteases are prime therapeutic targets. A transmembrane aspartic protease with all the known characteristics of beta-secretase was cloned and characterized. Overexpression of this protease, termed BACE (for beta-site APP-cleaving enzyme) increased the amount of beta-secretase cleavage products, and these were cleaved exactly and only at known beta-secretase positions. Antisense inhibition of endogenous BACE messenger RNA decreased the amount of beta-secretase cleavage products, and purified BACE protein cleaved APP-derived substrates with the same sequence specificity as beta-secretase. Finally, the expression pattern and subcellular localization of BACE were consistent with that expected for beta-secretase. Future development of BACE inhibitors may prove beneficial for the treatment of Alzheimer's disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vassar, R -- Bennett, B D -- Babu-Khan, S -- Kahn, S -- Mendiaz, E A -- Denis, P -- Teplow, D B -- Ross, S -- Amarante, P -- Loeloff, R -- Luo, Y -- Fisher, S -- Fuller, J -- Edenson, S -- Lile, J -- Jarosinski, M A -- Biere, A L -- Curran, E -- Burgess, T -- Louis, J C -- Collins, F -- Treanor, J -- Rogers, G -- Citron, M -- New York, N.Y. -- Science. 1999 Oct 22;286(5440):735-41.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Amgen, Inc., One Amgen Center Drive, M/S 29-2-B, Thousand Oaks, CA 91320-1799, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10531052" target="_blank"〉PubMed〈/a〉
    Keywords: Alzheimer Disease/drug therapy/*enzymology ; Amino Acid Motifs ; Amino Acid Sequence ; Amyloid Precursor Protein Secretases ; Amyloid beta-Peptides/*biosynthesis ; Amyloid beta-Protein Precursor/*metabolism ; Animals ; Aspartic Acid Endopeptidases/chemistry/genetics/*isolation & ; purification/*metabolism ; Binding Sites ; Brain/enzymology/metabolism ; Cell Line ; Cloning, Molecular ; Endopeptidases ; Endosomes/enzymology ; Gene Expression ; Gene Library ; Golgi Apparatus/enzymology ; Humans ; Hydrogen-Ion Concentration ; Molecular Sequence Data ; Oligonucleotides, Antisense/pharmacology ; Peptides/metabolism ; Protease Inhibitors/pharmacology ; RNA, Messenger/genetics/metabolism ; Recombinant Fusion Proteins/metabolism ; Transfection
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    Perspectives: neurobiology. Cranking it up a notch (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-11-30
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chenn, A -- Walsh, C A -- New York, N.Y. -- Science. 1999 Oct 22;286(5440):689-90.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, Brigham and Women's Hospital, Boston, MA 02115, USA. shoogasmax@netzero.net〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10577225" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Communication ; Cell Count ; Cell Differentiation ; Cell Nucleus/metabolism ; Cells, Cultured ; Cerebral Cortex/cytology/metabolism ; Humans ; Ligands ; Membrane Proteins/*metabolism ; Neurites/*physiology ; Neurons/*cytology/metabolism ; Receptor, Notch1 ; Receptor, Notch2 ; Receptors, Cell Surface/*metabolism ; *Signal Transduction ; Stem Cells/cytology/metabolism ; *Transcription Factors ; Transcriptional Activation ; Transfection
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  • 48
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    Evidence for autoregulation of cystathionine gamma-synthase mRNA stability in Arabidopsis (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-11-13
    Description: Control of messenger RNA (mRNA) stability serves as an important mechanism for regulating gene expression. Analysis of Arabidopsis mutants that overaccumulate soluble methionine (Met) revealed that the gene for cystathionine gamma-synthase (CGS), the key enzyme in Met biosynthesis, is regulated at the level of mRNA stability. Transfection experiments with wild-type and mutant forms of the CGS gene suggest that an amino acid sequence encoded by the first exon of CGS acts in cis to destabilize its own mRNA in a process that is activated by Met or one of its metabolites.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chiba, Y -- Ishikawa, M -- Kijima, F -- Tyson, R H -- Kim, J -- Yamamoto, A -- Nambara, E -- Leustek, T -- Wallsgrove, R M -- Naito, S -- New York, N.Y. -- Science. 1999 Nov 12;286(5443):1371-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Applied Bioscience, Graduate School of Agriculture, Hokkaido University, Sapporo 060-8589, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10558994" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Arabidopsis/*enzymology/genetics ; Carbon-Oxygen Lyases/chemistry/*genetics/metabolism ; Exons ; Gene Expression Regulation, Enzymologic ; *Gene Expression Regulation, Plant ; Genes, Plant ; Genes, Reporter ; Kinetics ; Methionine/metabolism ; Molecular Sequence Data ; Mutation ; RNA, Messenger/genetics/*metabolism ; Sequence Alignment ; Transcription, Genetic ; Transfection
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    Differential stimulation of PKC phosphorylation of potassium channels by ZIP1 and ZIP2 (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-09-08
    Description: Targeting of protein modification enzymes is a key biochemical step to achieve specific and effective posttranslational modifications. Two alternatively spliced ZIP1 and ZIP2 proteins are described, which bind to both Kvbeta2 subunits of potassium channel and protein kinase C (PKC) zeta, thereby acting as a physical link in the assembly of PKCzeta-ZIP-potassium channel complexes. ZIP1 and ZIP2 differentially stimulate phosphorylation of Kvbeta2 by PKCzeta. They also interact to form heteromultimers, which allows for a hybrid stimulatory activity to PKCzeta. Finally, ZIP1 and ZIP2 coexist in the same cell type and are elevated differentially by neurotrophic factors. These results provide a mechanism for specificity and regulation of PKCzeta-targeted phosphorylation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gong, J -- Xu, J -- Bezanilla, M -- van Huizen, R -- Derin, R -- Li, M -- NS33324/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1999 Sep 3;285(5433):1565-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, The Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, MD 21205, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10477520" target="_blank"〉PubMed〈/a〉
    Keywords: Alternative Splicing ; Amino Acid Sequence ; Animals ; Binding Sites ; Carrier Proteins/chemistry/genetics/*metabolism ; Cell Line ; Cerebellum/metabolism ; DNA, Complementary ; Isoenzymes/metabolism ; Molecular Sequence Data ; Myelin Basic Protein/metabolism ; Nerve Growth Factors/pharmacology ; Neurons/*metabolism ; Phosphorylation ; Potassium Channels/*metabolism ; Protein Kinase C/*metabolism ; Pyramidal Cells/metabolism ; RNA, Messenger/genetics/metabolism ; Rats ; Rats, Sprague-Dawley ; Recombinant Fusion Proteins/chemistry/metabolism ; Substrate Specificity ; Transfection
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    Stat3-mediated transformation of NIH-3T3 cells by the constitutively active Q205L Galphao protein (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-12-30
    Description: Expression of Q205L Galphao (Galphao*), an alpha subunit of heterotrimeric guanine nucleotide-binding proteins (G proteins) that lacks guanosine triphosphatase (GTPase) activity in NIH-3T3 cells, results in transformation. Expression of Galphao* in NIH-3T3 cells activated signal transducer and activator of transcription 3 (Stat3) but not mitogen-activated protein (MAP) kinases 1 or 2. Coexpression of dominant negative Stat3 inhibited Galphao*-induced transformation of NIH-3T3 cells and activation of endogenous Stat3. Furthermore, Galphao* expression increased activity of the tyrosine kinase c-Src, and the Galphao*-induced activation of Stat3 was blocked by expression of Csk (carboxyl-terminal Src kinase), which inactivates c-Src. The results indicate that Stat3 can function as a downstream effector for Galphao* and mediate its biological effects.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ram, P T -- Horvath, C M -- Iyengar, R -- 1F32 CA79134-01/CA/NCI NIH HHS/ -- DK-38671/DK/NIDDK NIH HHS/ -- GM-54508/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2000 Jan 7;287(5450):142-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology, Immunobiology Center, Mount Sinai School of Medicine, One Gustave L. Levy Place, New York, NY 10029, USA. ramp01@doc.mssm.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10615050" target="_blank"〉PubMed〈/a〉
    Keywords: 3T3 Cells ; Animals ; Cell Line, Transformed ; *Cell Transformation, Neoplastic ; DNA-Binding Proteins/*metabolism ; Enzyme Activation ; GTP-Binding Protein alpha Subunits ; Genes, Reporter ; Heterotrimeric GTP-Binding Proteins/genetics/*metabolism ; MAP Kinase Signaling System ; Mice ; Mitogen-Activated Protein Kinase 1/metabolism ; Mitogen-Activated Protein Kinases/metabolism ; Neurites/physiology ; Neuronal Plasticity ; Neurons/metabolism/physiology ; Phosphorylation ; Phosphotyrosine/metabolism ; Protein-Tyrosine Kinases/metabolism ; STAT3 Transcription Factor ; Signal Transduction ; Trans-Activators/*metabolism ; Transfection ; src-Family Kinases
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Imaging protein kinase Calpha activation in cells (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-03-26
    Description: Spatially resolved fluorescence resonance energy transfer (FRET) measured by fluorescence lifetime imaging microscopy (FLIM), provides a method for tracing the catalytic activity of fluorescently tagged proteins inside live cell cultures and enables determination of the functional state of proteins in fixed cells and tissues. Here, a dynamic marker of protein kinase Calpha (PKCalpha) activation is identified and exploited. Activation of PKCalpha is detected through the binding of fluorescently tagged phosphorylation site-specific antibodies; the consequent FRET is measured through the donor fluorophore on PKCalpha by FLIM. This approach enabled the imaging of PKCalpha activation in live and fixed cultured cells and was also applied to pathological samples.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ng, T -- Squire, A -- Hansra, G -- Bornancin, F -- Prevostel, C -- Hanby, A -- Harris, W -- Barnes, D -- Schmidt, S -- Mellor, H -- Bastiaens, P I -- Parker, P J -- New York, N.Y. -- Science. 1999 Mar 26;283(5410):2085-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Protein Phosphorylation Laboratory and Cell Biophysics Laboratory, Imperial Cancer Research Fund (ICRF), 44 Lincoln's Inn Fields, London, WC2A 3PX, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10092232" target="_blank"〉PubMed〈/a〉
    Keywords: 3T3 Cells ; Animals ; Breast Neoplasms/enzymology ; COS Cells ; Catalysis ; Cytoplasm/enzymology ; Endoplasmic Reticulum/enzymology ; Energy Transfer ; Enzyme Activation ; Fluorescence ; Fluorescent Dyes ; Golgi Apparatus/enzymology ; Green Fluorescent Proteins ; Humans ; Immune Sera ; Isoenzymes/immunology/*metabolism ; Luminescent Proteins ; Mice ; *Microscopy, Fluorescence ; Phosphorylation ; Phosphothreonine/immunology/metabolism ; Protein Kinase C/immunology/*metabolism ; Protein Kinase C-alpha ; Tetradecanoylphorbol Acetate/pharmacology ; Transfection
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    Control of mRNA decay by heat shock-ubiquitin-proteasome pathway (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-04-16
    Description: Cytokine and proto-oncogene messenger RNAs (mRNAs) are rapidly degraded through AU-rich elements in the 3' untranslated region. Rapid decay involves AU-rich binding protein AUF1, which complexes with heat shock proteins hsc70-hsp70, translation initiation factor eIF4G, and poly(A) binding protein. AU-rich mRNA decay is associated with displacement of eIF4G from AUF1, ubiquitination of AUF1, and degradation of AUF1 by proteasomes. Induction of hsp70 by heat shock, down-regulation of the ubiquitin-proteasome network, or inactivation of ubiquitinating enzyme E1 all result in hsp70 sequestration of AUF1 in the perinucleus-nucleus, and all three processes block decay of AU-rich mRNAs and AUF1 protein. These results link the rapid degradation of cytokine mRNAs to the ubiquitin-proteasome pathway.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Laroia, G -- Cuesta, R -- Brewer, G -- Schneider, R J -- CA42357/CA/NCI NIH HHS/ -- CA52443/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1999 Apr 16;284(5413):499-502.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Biochemistry, New York University School of Medicine, New York, NY 10016, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10205060" target="_blank"〉PubMed〈/a〉
    Keywords: 3' Untranslated Regions ; Carrier Proteins/metabolism ; Cell Nucleus/metabolism ; Cysteine Endopeptidases/*metabolism ; Cysteine Proteinase Inhibitors/pharmacology ; Cytoplasm/metabolism ; Eukaryotic Initiation Factor-4G ; Granulocyte-Macrophage Colony-Stimulating Factor/*genetics ; HSC70 Heat-Shock Proteins ; HSP70 Heat-Shock Proteins/*metabolism ; HeLa Cells ; *Heat-Shock Response ; *Heterogeneous-Nuclear Ribonucleoprotein D ; Humans ; Leupeptins/pharmacology ; Multienzyme Complexes/*metabolism ; Peptide Initiation Factors/metabolism ; Poly(A)-Binding Proteins ; Proteasome Endopeptidase Complex ; Protein Binding ; RNA, Messenger/genetics/*metabolism ; RNA-Binding Proteins/*metabolism ; Transfection ; Ubiquitins/*metabolism
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    Receptor for motilin identified in the human gastrointestinal system (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-06-26
    Description: Motilin is a 22-amino acid peptide hormone expressed throughout the gastrointestinal (GI) tract of humans and other species. It affects gastric motility by stimulating interdigestive antrum and duodenal contractions. A heterotrimeric guanosine triphosphate-binding protein (G protein)-coupled receptor for motilin was isolated from human stomach, and its amino acid sequence was found to be 52 percent identical to the human receptor for growth hormone secretagogues. The macrolide antibiotic erythromycin also interacted with the cloned motilin receptor, providing a molecular basis for its effects on the human GI tract. The motilin receptor is expressed in enteric neurons of the human duodenum and colon. Development of motilin receptor agonists and antagonists may be useful in the treatment of multiple disorders of GI motility.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Feighner, S D -- Tan, C P -- McKee, K K -- Palyha, O C -- Hreniuk, D L -- Pong, S S -- Austin, C P -- Figueroa, D -- MacNeil, D -- Cascieri, M A -- Nargund, R -- Bakshi, R -- Abramovitz, M -- Stocco, R -- Kargman, S -- O'Neill, G -- Van Der Ploeg, L H -- Evans, J -- Patchett, A A -- Smith, R G -- Howard, A D -- New York, N.Y. -- Science. 1999 Jun 25;284(5423):2184-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Metabolic Disorders, Department of Medicinal Chemistry, Merck Research Laboratories, Building RY-80Y-265, 126 East Lincoln Avenue, Rahway, NJ 07065, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10381885" target="_blank"〉PubMed〈/a〉
    Keywords: Alternative Splicing ; Amino Acid Sequence ; Base Sequence ; Binding Sites ; Calcium/metabolism ; Cell Line ; Chromosome Mapping ; Chromosomes, Human, Pair 13 ; Cloning, Molecular ; Colon/*metabolism ; Erythromycin/metabolism ; GTP-Binding Proteins/metabolism ; Humans ; In Situ Hybridization ; Intestine, Small/*metabolism ; Ligands ; Molecular Sequence Data ; Motilin/analogs & derivatives/*metabolism ; Receptors, Gastrointestinal Hormone/*chemistry/*genetics/metabolism ; Receptors, Neuropeptide/*chemistry/*genetics/metabolism ; Stomach/*metabolism ; Thyroid Gland/metabolism ; Transfection
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    Activation of PPARgamma coactivator-1 through transcription factor docking (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-11-13
    Description: Transcriptional coactivators have been viewed as constitutively active components, using transcription factors mainly to localize their functions. Here, it is shown that PPARgamma coactivator-1 (PGC-1) promotes transcription through the assembly of a complex that includes the histone acetyltransferases steroid receptor coactivator-1 (SRC-1) and CREB binding protein (CBP)/p300. PGC-1 has a low inherent transcriptional activity when it is not bound to a transcription factor. The docking of PGC-1 to peroxisome proliferator-activated receptor gamma (PPARgamma) stimulates an apparent conformational change in PGC-1 that permits binding of SRC-1 and CBP/p300, resulting in a large increase in transcriptional activity. Thus, transcription factor docking switches on the activity of a coactivator protein.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Puigserver, P -- Adelmant, G -- Wu, Z -- Fan, M -- Xu, J -- O'Malley, B -- Spiegelman, B M -- DK54477/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1999 Nov 12;286(5443):1368-71.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Dana-Farber Cancer Institute and Department of Cell Biology, Harvard Medical School, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10558993" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Binding Sites ; COS Cells ; DNA-Binding Proteins/metabolism ; E1A-Associated p300 Protein ; Gene Expression Regulation ; Histone Acetyltransferases ; Mice ; Nuclear Proteins/chemistry/*metabolism ; Nuclear Receptor Coactivator 1 ; Nuclear Respiratory Factors ; Protein Binding ; Protein Conformation ; Receptors, Cytoplasmic and Nuclear/*metabolism ; Recombinant Fusion Proteins/metabolism ; Trans-Activators/chemistry/*metabolism ; Transcription Factors/chemistry/*metabolism ; *Transcription, Genetic ; Transfection
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    Mediation by a CREB family transcription factor of NGF-dependent survival of sympathetic neurons (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-12-22
    Description: Nerve growth factor (NGF) and other neurotrophins support survival of neurons through processes that are incompletely understood. The transcription factor CREB is a critical mediator of NGF-dependent gene expression, but whether CREB family transcription factors regulate expression of genes that contribute to NGF-dependent survival of sympathetic neurons is unknown. CREB-mediated gene expression was both necessary for NGF-dependent survival and sufficient on its own to promote survival of sympathetic neurons. Moreover, expression of Bcl-2 was activated by NGF and other neurotrophins by a CREB-dependent transcriptional mechanism. Overexpression of Bcl-2 reduced the death-promoting effects of CREB inhibition. Together, these data support a model in which neurotrophins promote survival of neurons, in part through a mechanism involving CREB family transcription factor-dependent expression of genes encoding prosurvival factors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Riccio, A -- Ahn, S -- Davenport, C M -- Blendy, J A -- Ginty, D D -- NS34814-04/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1999 Dec 17;286(5448):2358-61.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neuroscience, The Johns Hopkins University School of Medicine, 725 North Wolfe Street, Baltimore, MD 21205-2185, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10600750" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Apoptosis ; Axons/drug effects/metabolism ; Brain-Derived Neurotrophic Factor/pharmacology ; Cell Nucleus/metabolism ; Cell Survival ; Cells, Cultured ; Cyclic AMP Response Element-Binding Protein/antagonists & inhibitors/*metabolism ; *Gene Expression Regulation ; Genes, bcl-2 ; Genetic Vectors ; Nerve Growth Factor/*pharmacology ; Neurons/*cytology/drug effects/metabolism ; PC12 Cells ; Promoter Regions, Genetic ; Proto-Oncogene Proteins c-bcl-2/genetics/metabolism ; Rats ; Recombinant Fusion Proteins/metabolism ; Signal Transduction ; Sympathetic Nervous System/*cytology/drug effects/metabolism ; Transfection
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    Identification of a conserved receptor-binding site on the fiber proteins of CAR-recognizing adenoviridae (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-11-24
    Description: The human adenovirus serotype 5 (Ad5) is used widely for applications in human gene therapy. Cellular attachment of Ad5 is mediated by binding of the carboxyl-terminal knob of its fiber coat protein to the Coxsackie adenovirus receptor (CAR) protein. However, Ad5 binding to CAR hampers the development of adenovirus vectors capable of specifically targeting (diseased) tissues or organs. Through sequence analysis and mutagenesis, a conserved receptor-binding region was identified on the side of three divergent CAR-binding knobs. The feasibility of simultaneous CAR ablation and redirection of an adenovirus to a new receptor is demonstrated.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Roelvink, P W -- Mi Lee, G -- Einfeld, D A -- Kovesdi, I -- Wickham, T J -- New York, N.Y. -- Science. 1999 Nov 19;286(5444):1568-71.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Research and Development, GenVec Inc., 65 West Watkins Mill Road, Gaithersburg, MD 20879, USA. genecloner@genvec.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10567265" target="_blank"〉PubMed〈/a〉
    Keywords: Adenoviruses, Human/*chemistry/metabolism ; Amino Acid Sequence ; Binding Sites ; Capsid/*chemistry/genetics/*metabolism ; *Capsid Proteins ; Cell Line ; Conserved Sequence ; Coxsackie and Adenovirus Receptor-Like Membrane Protein ; Genetic Vectors ; Humans ; Models, Molecular ; Mutagenesis, Site-Directed ; Point Mutation ; Protein Conformation ; Protein Structure, Secondary ; Receptors, Virus/*metabolism ; Sequence Deletion ; Transfection ; Tumor Cells, Cultured
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    Regulation of transcription by a protein methyltransferase (1999)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1999-06-26
    Description: The p160 family of coactivators, SRC-1, GRIP1/TIF2, and p/CIP, mediate transcriptional activation by nuclear hormone receptors. Coactivator-associated arginine methyltransferase 1 (CARM1), a previously unidentified protein that binds to the carboxyl-terminal region of p160 coactivators, enhanced transcriptional activation by nuclear receptors, but only when GRIP1 or SRC-1a was coexpressed. Thus, CARM1 functions as a secondary coactivator through its association with p160 coactivators. CARM1 can methylate histone H3 in vitro, and a mutation in the putative S-adenosylmethionine binding domain of CARM1 substantially reduced both methyltransferase and coactivator activities. Thus, coactivator-mediated methylation of proteins in the transcription machinery may contribute to transcriptional regulation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, D -- Ma, H -- Hong, H -- Koh, S S -- Huang, S M -- Schurter, B T -- Aswad, D W -- Stallcup, M R -- AG00093/AG/NIA NIH HHS/ -- DK43093/DK/NIDDK NIH HHS/ -- NS17269/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1999 Jun 25;284(5423):2174-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology HMR 301, University of Southern California, 2011 Zonal Avenue, Los Angeles, CA 90033, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10381882" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Cell Line ; Histone Acetyltransferases ; Histones/metabolism ; Methylation ; Mice ; Molecular Sequence Data ; Mutation ; Nuclear Receptor Coactivator 1 ; Nuclear Receptor Coactivator 2 ; Nuclear Receptor Coactivator 3 ; Protein-Arginine N-Methyltransferases/chemistry/genetics/*metabolism ; Receptors, Androgen/metabolism ; Receptors, Estrogen/metabolism ; Receptors, Thyroid Hormone/metabolism ; Recombinant Fusion Proteins/metabolism ; Signal Transduction ; Trans-Activators/*metabolism ; Transcription Factors/metabolism ; *Transcriptional Activation ; Transfection
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    Peptide agonist of the thrombopoietin receptor as potent as the natural cytokine (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-06-13
    Description: Two families of small peptides that bind to the human thrombopoietin receptor and compete with the binding of the natural ligand thrombopoietin (TPO) were identified from recombinant peptide libraries. The sequences of these peptides were not found in the primary sequence of TPO. Screening libraries of variants of one of these families under affinity-selective conditions yielded a 14-amino acid peptide (Ile-Glu-Gly-Pro-Thr-Leu-Arg-Gln-Trp-Leu-Ala-Ala-Arg-Ala) with high affinity (dissociation constant approximately 2 nanomolar) that stimulates the proliferation of a TPO-responsive Ba/F3 cell line with a median effective concentration (EC50) of 400 nanomolar. Dimerization of this peptide by a carboxyl-terminal linkage to a lysine branch produced a compound with an EC50 of 100 picomolar, which was equipotent to the 332-amino acid natural cytokine in cell-based assays. The peptide dimer also stimulated the in vitro proliferation and maturation of megakaryocytes from human bone marrow cells and promoted an increase in platelet count when administered to normal mice.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cwirla, S E -- Balasubramanian, P -- Duffin, D J -- Wagstrom, C R -- Gates, C M -- Singer, S C -- Davis, A M -- Tansik, R L -- Mattheakis, L C -- Boytos, C M -- Schatz, P J -- Baccanari, D P -- Wrighton, N C -- Barrett, R W -- Dower, W J -- New York, N.Y. -- Science. 1997 Jun 13;276(5319):1696-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Affymax Research Institute, 4001 Miranda Avenue, Palo Alto, CA 94304, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9180079" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Binding, Competitive ; Blood Platelets/cytology ; Cell Division ; Cell Line ; Cells, Cultured ; Consensus Sequence ; Dimerization ; Erythropoietin/pharmacology ; Hematopoiesis/drug effects ; Humans ; Megakaryocytes/cytology ; Mice ; Molecular Sequence Data ; *Neoplasm Proteins ; Oligopeptides/*metabolism/*pharmacology ; Peptide Library ; Peptides/metabolism/pharmacology ; Platelet Count ; Proto-Oncogene Proteins/*agonists/metabolism ; *Receptors, Cytokine ; Receptors, Thrombopoietin ; Recombinant Proteins/metabolism/pharmacology ; Thrombopoietin/*metabolism/pharmacology ; Transfection
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  • 59
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    Reduced ubiquitin-dependent degradation of c-Jun after phosphorylation by MAP kinases (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-01-17
    Description: The proto-oncogene-encoded transcription factor c-Jun activates genes in response to a number of inducers that act through mitogen-activated protein kinase (MAPK) signal transduction pathways. The activation of c-Jun after phosphorylation by MAPK is accompanied by a reduction in c-Jun ubiquitination and consequent stabilization of the protein. These results illustrate the relevance of regulated protein degradation in the signal-dependent control of gene expression.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Musti, A M -- Treier, M -- Bohmann, D -- New York, N.Y. -- Science. 1997 Jan 17;275(5298):400-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉European Molecular Biology Laboratory, Meyerhofstr. 1, 69117 Heidelberg, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8994040" target="_blank"〉PubMed〈/a〉
    Keywords: 3T3 Cells ; Animals ; Calcium-Calmodulin-Dependent Protein Kinases/*metabolism ; Cell Cycle Proteins/metabolism ; GTP-Binding Proteins/metabolism ; Gene Expression Regulation ; JNK Mitogen-Activated Protein Kinases ; Mice ; *Mitogen-Activated Protein Kinases ; Phosphorylation ; Proto-Oncogene Proteins c-jun/*metabolism ; Signal Transduction ; Transfection ; Ubiquitins/*metabolism ; cdc42 GTP-Binding Protein, Saccharomyces cerevisiae
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    Interaction and regulation of subcellular localization of CED-4 by CED-9 (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-02-21
    Description: The Caenorhabditis elegans survival gene ced-9 regulates ced-4 activity and inhibits cell death, but the mechanism by which this occurs is unknown. Through a genetic screen for CED-4-binding proteins, CED-9 was identified as an interacting partner of CED-4. CED-9, but not loss-of-function mutants, associated specifically with CED-4 in yeast or mammalian cells. The CED-9 protein localized primarily to intracellular membranes and the perinuclear region, whereas CED-4 was distributed in the cytosol. Expression of CED-9, but not a mutant lacking the carboxy-terminal hydrophobic domain, targeted CED-4 from the cytosol to intracellular membranes in mammalian cells. Thus, the actions of CED-4 and CED-9 are directly linked, which could provide the basis for the regulation of programmed cell death in C. elegans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wu, D -- Wallen, H D -- Nunez, G -- CA-64556/CA/NCI NIH HHS/ -- T32A107413-03/PHS HHS/ -- New York, N.Y. -- Science. 1997 Feb 21;275(5303):1126-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology and Comprehensive Cancer Center, The University of Michigan Medical School, Ann Arbor, MI 48109, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9027313" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Apoptosis ; Apoptosis Regulatory Proteins ; Caenorhabditis elegans/*cytology/genetics ; *Caenorhabditis elegans Proteins ; Calcium-Binding Proteins/analysis/genetics/*metabolism ; Cell Fractionation ; Cell Line ; Cytosol/chemistry ; Genes, Helminth ; Helminth Proteins/analysis/genetics/*metabolism ; Humans ; Intracellular Membranes/chemistry ; Mutation ; Proto-Oncogene Proteins/analysis/genetics/*metabolism ; *Proto-Oncogene Proteins c-bcl-2 ; Transfection ; bcl-X Protein
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    Transmission of hepatitis C by intrahepatic inoculation with transcribed RNA (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-07-25
    Description: More than 1% of the world's population is chronically infected with hepatitis C virus (HCV). HCV infection can result in acute hepatitis, chronic hepatitis, and cirrhosis, which is strongly associated with development of hepatocellular carcinoma. Genetic studies of HCV replication have been hampered by lack of a bona fide infectious molecular clone. Full-length functional clones of HCV complementary DNA were constructed. RNA transcripts from the clones were found to be infectious and to cause disease in chimpanzees after direct intrahepatic inoculation. This work defines the structure of a functional HCV genome RNA and proves that HCV alone is sufficient to cause disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kolykhalov, A A -- Agapov, E V -- Blight, K J -- Mihalik, K -- Feinstone, S M -- Rice, C M -- AI40034/AI/NIAID NIH HHS/ -- CA57973/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1997 Jul 25;277(5325):570-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Microbiology, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, MO 63110-1093, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9228008" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cloning, Molecular ; Consensus Sequence ; DNA, Complementary ; Hepacivirus/*genetics/physiology ; Hepatitis C/*transmission/*virology ; Liver/*virology ; Molecular Sequence Data ; Pan troglodytes ; Polymerase Chain Reaction ; RNA, Messenger/*genetics ; RNA, Viral/blood/*genetics ; Transfection ; Viremia ; Virus Replication
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    Conservation of the Chk1 checkpoint pathway in mammals: linkage of DNA damage to Cdk regulation through Cdc25 (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-09-05
    Description: In response to DNA damage, mammalian cells prevent cell cycle progression through the control of critical cell cycle regulators. A human gene was identified that encodes the protein Chk1, a homolog of the Schizosaccharomyces pombe Chk1 protein kinase, which is required for the DNA damage checkpoint. Human Chk1 protein was modified in response to DNA damage. In vitro Chk1 bound to and phosphorylated the dual-specificity protein phosphatases Cdc25A, Cdc25B, and Cdc25C, which control cell cycle transitions by dephosphorylating cyclin-dependent kinases. Chk1 phosphorylates Cdc25C on serine-216. As shown in an accompanying paper by Peng et al. in this issue, serine-216 phosphorylation creates a binding site for 14-3-3 protein and inhibits function of the phosphatase. These results suggest a model whereby in response to DNA damage, Chk1 phosphorylates and inhibits Cdc25C, thus preventing activation of the Cdc2-cyclin B complex and mitotic entry.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sanchez, Y -- Wong, C -- Thoma, R S -- Richman, R -- Wu, Z -- Piwnica-Worms, H -- Elledge, S J -- GM17763/GM/NIGMS NIH HHS/ -- GM44664/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1997 Sep 5;277(5331):1497-501.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Verna and Marrs McLean Department of Biochemistry, Howard Hughes Medical Institute, Baylor College of Medicine, One Baylor Plaza, Houston, TX 77030, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9278511" target="_blank"〉PubMed〈/a〉
    Keywords: 14-3-3 Proteins ; Amino Acid Sequence ; Animals ; CDC2 Protein Kinase/*metabolism ; Cell Cycle Proteins/antagonists & inhibitors/*metabolism ; Chromosome Mapping ; Chromosomes, Human, Pair 11 ; Cytoskeletal Proteins ; *DNA Damage ; *F-Box Proteins ; G2 Phase ; HeLa Cells ; Humans ; Mice ; *Mitosis ; Molecular Sequence Data ; Phosphoprotein Phosphatases/metabolism ; Phosphorylation ; Phosphoserine/metabolism ; Protein Kinases/chemistry/genetics/*metabolism ; Protein Tyrosine Phosphatases/metabolism ; Proteins/metabolism ; Recombinant Fusion Proteins/metabolism ; Schizosaccharomyces pombe Proteins ; Signal Transduction ; Transfection ; *Tyrosine 3-Monooxygenase ; *Ubiquitin-Protein Ligases ; *cdc25 Phosphatases
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    Caspase-3-generated fragment of gelsolin: effector of morphological change in apoptosis (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-10-10
    Description: The caspase-3 (CPP32, apopain, YAMA) family of cysteinyl proteases has been implicated as key mediators of apoptosis in mammalian cells. Gelsolin was identified as a substrate for caspase-3 by screening the translation products of small complementary DNA pools for sensitivity to cleavage by caspase-3. Gelsolin was cleaved in vivo in a caspase-dependent manner in cells stimulated by Fas. Caspase-cleaved gelsolin severed actin filaments in vitro in a Ca2+-independent manner. Expression of the gelsolin cleavage product in multiple cell types caused the cells to round up, detach from the plate, and undergo nuclear fragmentation. Neutrophils isolated from mice lacking gelsolin had delayed onset of both blebbing and DNA fragmentation, following apoptosis induction, compared with wild-type neutrophils. Thus, cleaved gelsolin may be one physiological effector of morphologic change during apoptosis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kothakota, S -- Azuma, T -- Reinhard, C -- Klippel, A -- Tang, J -- Chu, K -- McGarry, T J -- Kirschner, M W -- Koths, K -- Kwiatkowski, D J -- Williams, L T -- P01 HL48743/HL/NHLBI NIH HHS/ -- R01 HL54188/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1997 Oct 10;278(5336):294-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Chiron Corporation, Emeryville, CA 94608, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9323209" target="_blank"〉PubMed〈/a〉
    Keywords: Actins/metabolism ; Amino Acid Chloromethyl Ketones/pharmacology ; Animals ; Antigens, CD95/physiology ; *Apoptosis ; Caspase 3 ; *Caspases ; Cell Line ; *Cell Size ; Cycloheximide/pharmacology ; Cysteine Endopeptidases/*metabolism ; Cysteine Proteinase Inhibitors/pharmacology ; Cytoskeleton/metabolism ; DNA Fragmentation ; Gelsolin/*metabolism ; Humans ; Mice ; Neutrophils/cytology/metabolism ; Recombinant Proteins/metabolism ; Transfection ; Tumor Cells, Cultured ; Tumor Necrosis Factor-alpha/pharmacology
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    Evidence for a role of CRM1 in signal-mediated nuclear protein export (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-10-06
    Description: Chromosome maintenance region 1 (CRM1), a protein that shares sequence similarities with the karyopherin beta family of proteins involved in nuclear import pathway, was shown to form a complex with the leucine-rich nuclear export signal (NES). This interaction was inhibited by leptomycin B, a drug that prevents the function of the CRM1 protein in yeast. To analyze the role of the CRM1-NES interaction in nuclear export, a transport assay based on semipermeabilized cells was developed. In this system, which reconstituted NES-, cytosol-, and energy-dependent nuclear export, leptomycin B specifically blocked export of NES-containing proteins. Thus, the CRM1 protein could act as a NES receptor involved in nuclear protein export.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ossareh-Nazari, B -- Bachelerie, F -- Dargemont, C -- New York, N.Y. -- Science. 1997 Oct 3;278(5335):141-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut Curie-CNRS Unite Mixte de Recherche 144, 26 rue d'Ulm, 75248 Paris Cedex 05, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9311922" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/metabolism ; Amino Acid Sequence ; Biological Transport/drug effects ; Carrier Proteins/*physiology ; Cell Nucleus/*metabolism ; DNA-Binding Proteins/chemistry/*metabolism ; Fatty Acids, Unsaturated/pharmacology ; Fluorescent Antibody Technique, Indirect ; HeLa Cells ; Humans ; *I-kappa B Proteins ; Immunoblotting ; *Karyopherins ; Nuclear Localization Signals ; Nuclear Proteins/*metabolism ; Protein Sorting Signals/chemistry/*metabolism ; Pyruvate Kinase/metabolism ; *Receptors, Cytoplasmic and Nuclear ; Recombinant Fusion Proteins/metabolism ; Transfection
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    Immune hyperactivation of HIV-1-infected T cells mediated by Tat and the CD28 pathway (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-03-07
    Description: Human immunodeficiency virus-type 1 (HIV-1) infection is characterized by a chronic state of immune hyperactivation in patients. Infection of human peripheral blood lymphocytes with HIV-1 in vitro resulted in increased interleukin-2 (IL-2) secretion in response to T cell activation via the CD3 and CD28 receptors. Expression of the HIV-1 transactivator Tat recapitulated this phenotype and was associated with increased IL-2 secretion in response to costimulation with CD3 plus CD28. IL-2 superinduction by Tat occurred at the transcriptional level, was mediated by the CD28-responsive element in the IL-2 promoter, and was exclusively dependent on the 29 amino acids encoded by the second exon of Tat.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ott, M -- Emiliani, S -- Van Lint, C -- Herbein, G -- Lovett, J -- Chirmule, N -- McCloskey, T -- Pahwa, S -- Verdin, E -- New York, N.Y. -- Science. 1997 Mar 7;275(5305):1481-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Picower Institute for Medical Research, 350 Community Drive, Manhasset, NY 11030, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9045614" target="_blank"〉PubMed〈/a〉
    Keywords: Anti-HIV Agents/pharmacology ; Antibodies, Monoclonal/immunology ; Antigens, CD28/*immunology ; Antigens, CD3/immunology ; Exons ; Gene Products, tat/genetics/*physiology ; HIV Infections/immunology ; HIV-1/drug effects/genetics/*physiology ; Humans ; Interleukin-2/genetics/*secretion ; Jurkat Cells ; Leukocytes, Mononuclear/virology ; *Lymphocyte Activation ; Promoter Regions, Genetic ; T-Lymphocytes/*immunology/*virology ; Transcription Factors/metabolism ; Transcription, Genetic ; Transfection ; Zidovudine/pharmacology ; tat Gene Products, Human Immunodeficiency Virus
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    Constitutive transcriptional activation by a beta-catenin-Tcf complex in APC-/- colon carcinoma (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-03-21
    Description: The adenomatous polyposis coli (APC) tumor suppressor protein binds to beta-catenin, a protein recently shown to interact with Tcf and Lef transcription factors. The gene encoding hTcf-4, a Tcf family member that is expressed in colonic epithelium, was cloned and characterized. hTcf-4 transactivates transcription only when associated with beta-catenin. Nuclei of APC-/- colon carcinoma cells were found to contain a stable beta-catenin-hTcf-4 complex that was constitutively active, as measured by transcription of a Tcf reporter gene. Reintroduction of APC removed beta-catenin from hTcf-4 and abrogated the transcriptional transactivation. Constitutive transcription of Tcf target genes, caused by loss of APC function, may be a crucial event in the early transformation of colonic epithelium.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Korinek, V -- Barker, N -- Morin, P J -- van Wichen, D -- de Weger, R -- Kinzler, K W -- Vogelstein, B -- Clevers, H -- CA57345/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1997 Mar 21;275(5307):1784-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Immunology, University Hospital, Post Office Box 85500, 3508 GA Utrecht, Netherlands.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9065401" target="_blank"〉PubMed〈/a〉
    Keywords: Adenomatous Polyposis Coli Protein ; Amino Acid Sequence ; Animals ; Cell Line ; Cell Transformation, Neoplastic ; Cloning, Molecular ; Colon/metabolism ; Colonic Neoplasms/*genetics/metabolism ; Cytoskeletal Proteins/genetics/*metabolism ; Gene Expression Regulation, Neoplastic ; *Genes, APC ; Genes, Reporter ; Humans ; Intestinal Mucosa/metabolism ; Mice ; Molecular Sequence Data ; Signal Transduction ; TCF Transcription Factors ; *Trans-Activators ; Transcription Factor 7-Like 2 Protein ; Transcription Factors/chemistry/genetics/*metabolism ; *Transcriptional Activation ; Transfection ; Tumor Cells, Cultured ; beta Catenin
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    Immune response and myoblasts that express Fas ligand (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-12-31
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kang, S M -- Hoffmann, A -- Le, D -- Springer, M L -- Stock, P G -- Blau, H M -- F32 HL08991/HL/NHLBI NIH HHS/ -- R01-CA59717/CA/NCI NIH HHS/ -- R01-HD18179/HD/NICHD NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1997 Nov 14;278(5341):1322-4.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9411754" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD95/biosynthesis ; Apoptosis ; Cell Differentiation ; Cell Transplantation ; Fas Ligand Protein ; *Graft Rejection ; Immune Tolerance ; Islets of Langerhans/cytology ; *Islets of Langerhans Transplantation ; Membrane Glycoproteins/genetics/*physiology ; Mice ; Mice, Inbred C3H ; Mice, Inbred C57BL ; Muscle Fibers, Skeletal/*cytology/metabolism ; Muscle, Skeletal/*cytology/metabolism ; Neutrophils/*immunology ; Transfection
    Print ISSN: 0036-8075
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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    Activation of heat shock transcription factor 3 by c-Myb in the absence of cellular stress (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-07-11
    Description: In vertebrates, the presence of multiple heat shock transcription factors (HSFs) indicates that these factors may be regulated by distinct stress signals. HSF3 was specifically activated in unstressed proliferating cells by direct binding to the c-myb proto-oncogene product (c-Myb). These factors formed a complex through their DNA binding domains that stimulated the nuclear entry and formation of the transcriptionally active trimer of HSF3. Because c-Myb participates in cellular proliferation, this regulatory pathway may provide a link between cellular proliferation and the stress response.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kanei-Ishii, C -- Tanikawa, J -- Nakai, A -- Morimoto, R I -- Ishii, S -- New York, N.Y. -- Science. 1997 Jul 11;277(5323):246-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Molecular Genetics, Tsukuba Life Science Center, RIKEN, Tsukuba, Ibaraki 305, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9211854" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Cell Cycle ; Cell Line ; Cell Nucleus/metabolism ; DNA/*metabolism ; DNA-Binding Proteins/chemistry/*metabolism ; Promoter Regions, Genetic ; Proto-Oncogene Proteins/*metabolism ; Proto-Oncogene Proteins c-myb ; Recombinant Fusion Proteins/metabolism ; Trans-Activators/chemistry/*metabolism ; Transcriptional Activation ; Transfection
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    Control of TRAIL-induced apoptosis by a family of signaling and decoy receptors (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-08-08
    Description: TRAIL (also called Apo2L) belongs to the tumor necrosis factor family, activates rapid apoptosis in tumor cells, and binds to the death-signaling receptor DR4. Two additional TRAIL receptors were identified. The receptor designated death receptor 5 (DR5) contained a cytoplasmic death domain and induced apoptosis much like DR4. The receptor designated decoy receptor 1 (DcR1) displayed properties of a glycophospholipid-anchored cell surface protein. DcR1 acted as a decoy receptor that inhibited TRAIL signaling. Thus, a cell surface mechanism exists for the regulation of cellular responsiveness to pro-apoptotic stimuli.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sheridan, J P -- Marsters, S A -- Pitti, R M -- Gurney, A -- Skubatch, M -- Baldwin, D -- Ramakrishnan, L -- Gray, C L -- Baker, K -- Wood, W I -- Goddard, A D -- Godowski, P -- Ashkenazi, A -- New York, N.Y. -- Science. 1997 Aug 8;277(5327):818-21.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Oncology, Genentech, South San Francisco, CA 94080-4918, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9242611" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; *Apoptosis ; Apoptosis Regulatory Proteins ; Cell Membrane/metabolism ; Cells, Cultured ; GPI-Linked Proteins ; Glycosylphosphatidylinositols/metabolism ; HeLa Cells ; Humans ; Ligands ; Membrane Glycoproteins/*metabolism ; Molecular Sequence Data ; NF-kappa B/metabolism ; Receptors, TNF-Related Apoptosis-Inducing Ligand ; Receptors, Tumor Necrosis Factor/chemistry/genetics/*metabolism ; Signal Transduction ; TNF-Related Apoptosis-Inducing Ligand ; Transfection ; Tumor Cells, Cultured ; Tumor Necrosis Factor Decoy Receptors ; Tumor Necrosis Factor-alpha/*metabolism
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    Identification of a chemokine receptor encoded by human cytomegalovirus as a cofactor for HIV-1 entry (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-06-20
    Description: The human cytomegalovirus encodes a beta-chemokine receptor (US28) that is distantly related to the human chemokine receptors CCR5 and CXCR4, which also serve as cofactors for the entry into cells of human immunodeficiency virus-type 1 (HIV-1). Like CCR5, US28 allowed infection of CD4-positive human cell lines by primary isolates of HIV-1 and HIV-2, as well as fusion of these cell lines with cells expressing the viral envelope proteins. In addition, US28 mediated infection by cell line-adapted HIV-1 for which CXCR4 was an entry cofactor.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pleskoff, O -- Treboute, C -- Brelot, A -- Heveker, N -- Seman, M -- Alizon, M -- New York, N.Y. -- Science. 1997 Jun 20;276(5320):1874-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Inserm U.332, Institut Cochin de Genetique Moleculaire, 22 rue Mechain, 75014 Paris, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9188536" target="_blank"〉PubMed〈/a〉
    Keywords: AIDS-Related Opportunistic Infections/virology ; Amino Acid Sequence ; Cell Fusion ; Chemokines ; Coculture Techniques ; Cytomegalovirus/*genetics/physiology ; Cytomegalovirus Infections/virology ; Giant Cells ; HIV Infections/virology ; HIV-1/*physiology ; HIV-2/*physiology ; HeLa Cells ; Humans ; Membrane Proteins/physiology ; Molecular Sequence Data ; Receptors, CCR2 ; Receptors, CCR5 ; Receptors, CXCR4 ; *Receptors, Chemokine ; Receptors, Cytokine/genetics/*physiology ; Receptors, HIV/genetics/*physiology ; Transfection ; Tumor Cells, Cultured ; Viral Proteins/genetics/*physiology
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    PTG, a protein phosphatase 1-binding protein with a role in glycogen metabolism (1997)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1997-03-07
    Description: Protein dephosphorylation by phosphatase PP1 plays a central role in mediating the effects of insulin on glucose and lipid metabolism. A PP1C-targeting protein expressed in 3T3-L1 adipocytes (called PTG, for protein targeting to glycogen) was cloned and characterized. PTG was expressed predominantly in insulin-sensitive tissues. In addition to binding and localizing PP1C to glycogen, PTG formed complexes with phosphorylase kinase, phosphorylase a, and glycogen synthase, the primary enzymes involved in the hormonal regulation of glycogen metabolism. Overexpression of PTG markedly increased basal and insulin-stimulated glycogen synthesis in Chinese hamster ovary cells overexpressing the insulin receptor, which do not express endogenous PTG. These results suggest that PTG is critical for glycogen metabolism, possibly functioning as a molecular scaffold.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Printen, J A -- Brady, M J -- Saltiel, A R -- New York, N.Y. -- Science. 1997 Mar 7;275(5305):1475-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, University of Michigan School of Medicine, Ann Arbor, MI 48109, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9045612" target="_blank"〉PubMed〈/a〉
    Keywords: 3T3 Cells ; Amino Acid Sequence ; Animals ; CHO Cells ; Carrier Proteins/chemistry/genetics/*metabolism ; Cloning, Molecular ; Cricetinae ; DNA, Complementary/genetics ; Glycogen/biosynthesis/*metabolism ; Glycogen Synthase/metabolism ; Insulin/pharmacology ; *Intracellular Signaling Peptides and Proteins ; Mice ; Molecular Sequence Data ; Phosphoprotein Phosphatases/*metabolism ; Phosphorylase Kinase/metabolism ; Phosphorylase a/metabolism ; Phosphorylation ; Protein Binding ; Protein Phosphatase 1 ; Recombinant Fusion Proteins/metabolism ; Substrate Specificity ; Transfection
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    A mammalian telomerase-associated protein (1997)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1997-02-14
    Description: The telomerase ribonucleoprotein catalyzes the addition of new telomeres onto chromosome ends. A gene encoding a mammalian telomerase homolog called TP1 (telomerase-associated protein 1) was identified and cloned. TP1 exhibited extensive amino acid similarity to the Tetrahymena telomerase protein p80 and was shown to interact specifically with mammalian telomerase RNA. Antiserum to TP1 immunoprecipitated telomerase activity from cell extracts, suggesting that TP1 is associated with telomerase in vivo. The identification of TP1 suggests that telomerase-associated proteins are conserved from ciliates to humans.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Harrington, L -- McPhail, T -- Mar, V -- Zhou, W -- Oulton, R -- Bass, M B -- Arruda, I -- Robinson, M O -- New York, N.Y. -- Science. 1997 Feb 14;275(5302):973-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Arruda, Ontario Cancer Institute-Amgen Institute, Department of Medical Biophysics, University of Toronto, 620 University Avenue, Toronto, Ontario M5G 2C1, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9020079" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Blotting, Northern ; Carrier Proteins/*chemistry/genetics/immunology/*metabolism ; Cell Line ; Cloning, Molecular ; DNA, Complementary/genetics ; Humans ; Mice ; Molecular Sequence Data ; Precipitin Tests ; RNA/*metabolism ; RNA, Messenger/genetics/metabolism ; Sequence Homology, Amino Acid ; Telomerase/*chemistry/genetics/metabolism ; Tetrahymena/chemistry/genetics ; Transfection ; Tumor Cells, Cultured
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    NF-AT activation induced by a CAML-interacting member of the tumor necrosis factor receptor superfamily (1997)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1997-10-06
    Description: Activation of the nuclear factor of activated T cells transcription factor (NF-AT) is a key event underlying lymphocyte action. The CAML (calcium-modulator and cyclophilin ligand) protein is a coinducer of NF-AT activation when overexpressed in Jurkat T cells. A member of the tumor necrosis factor receptor superfamily was isolated by virtue of its affinity for CAML. Cross-linking of this lymphocyte-specific protein, designated TACI (transmembrane activator and CAML-interactor), on the surface of transfected Jurkat cells with TACI-specific antibodies led to activation of the transcription factors NF-AT, AP-1, and NFkappaB. TACI-induced activation of NF-AT was specifically blocked by a dominant-negative CAML mutant, thus implicating CAML as a signaling intermediate.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉von Bulow, G U -- Bram, R J -- CA21765/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1997 Oct 3;278(5335):138-41.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Experimental Oncology, St. Jude Children's Research Hospital, 332 North Lauderdale, Memphis, TN 38105, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9311921" target="_blank"〉PubMed〈/a〉
    Keywords: *Adaptor Proteins, Signal Transducing ; Amino Acid Sequence ; Calcineurin ; Calmodulin-Binding Proteins/metabolism ; Carrier Proteins/genetics/*metabolism ; Cell Line ; Cell Membrane/metabolism ; DNA-Binding Proteins/*metabolism ; Humans ; Jurkat Cells ; Lymphocyte Activation ; *Membrane Proteins ; Molecular Sequence Data ; Mutation ; NF-kappa B/metabolism ; NFATC Transcription Factors ; *Nuclear Proteins ; Phosphoprotein Phosphatases/metabolism ; Receptors, Tumor Necrosis Factor/chemistry/genetics/*metabolism ; Sequence Alignment ; Signal Transduction ; T-Lymphocytes/immunology/*metabolism ; Transcription Factor AP-1/metabolism ; Transcription Factors/*metabolism ; Transcription, Genetic ; Transfection ; Transmembrane Activator and CAML Interactor Protein
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    Requirement for GD3 ganglioside in CD95- and ceramide-induced apoptosis (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-09-12
    Description: Gangliosides participate in development and tissue differentiation. Cross-linking of the apoptosis-inducing CD95 protein (also called Fas or APO-1) in lymphoid and myeloid tumor cells triggered GD3 ganglioside synthesis and transient accumulation. CD95-induced GD3 accumulation depended on integral receptor "death domains" and on activation of a family of cysteine proteases called caspases. Cell-permeating ceramides, which are potent inducers of apoptosis, also triggered GD3 synthesis. GD3 disrupted mitochondrial transmembrane potential (DeltaPsim), and induced apoptosis, in a caspase-independent fashion. Transient overexpression of the GD3 synthase gene directly triggered apoptosis. Pharmacological inhibition of GD3 synthesis and exposure to GD3 synthase antisense oligodeoxynucleotides prevented CD95-induced apoptosis. Thus, GD3 ganglioside mediates the propagation of CD95-generated apoptotic signals in hematopoietic cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉De Maria, R -- Lenti, L -- Malisan, F -- d'Agostino, F -- Tomassini, B -- Zeuner, A -- Rippo, M R -- Testi, R -- New York, N.Y. -- Science. 1997 Sep 12;277(5332):1652-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Experimental Medicine and Biochemical Sciences, University of Rome "Tor Vergata," 00133 Rome, Italy.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9287216" target="_blank"〉PubMed〈/a〉
    Keywords: Antigens, CD95/metabolism/*physiology ; *Apoptosis ; Ceramides/pharmacology/*physiology ; Cysteine Endopeptidases/metabolism ; Cysteine Proteinase Inhibitors/pharmacology ; Enzyme Inhibitors/pharmacology ; Gangliosides/biosynthesis/*metabolism/pharmacology ; Golgi Apparatus/metabolism ; Humans ; Membrane Potentials ; Mitochondria/physiology ; Morpholines/pharmacology ; Oligonucleotides, Antisense/pharmacology ; Sialyltransferases/genetics/metabolism ; Signal Transduction ; Transfection ; Tumor Cells, Cultured
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    CD4-independent binding of SIV gp120 to rhesus CCR5 (1997)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1997-12-31
    Description: CCR5 and CD4 are coreceptors for immunodeficiency virus entry into target cells. The gp120 envelope glycoprotein from human immunodeficiency virus strain HIV-1(YU2) bound human CCR5 (CCR5hu) or rhesus macaque CCR5 (CCR5rh) only in the presence of CD4. The gp120 from simian immunodeficiency virus strain SIVmac239 bound CCR5rh without CD4, but CCR5hu remained CD4-dependent. The CD4-independent binding of SIVmac239 gp120 depended on a single amino acid, Asp13, in the CCR5rh amino-terminus. Thus, CCR5-binding moieties on the immunodeficiency virus envelope glycoprotein can be generated by interaction with CD4 or by direct interaction with the CCR5 amino-terminus. These results may have implications for the evolution of receptor use among lentiviruses as well as utility in the development of effective intervention.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Martin, K A -- Wyatt, R -- Farzan, M -- Choe, H -- Marcon, L -- Desjardins, E -- Robinson, J -- Sodroski, J -- Gerard, C -- Gerard, N P -- AI41581/AI/NIAID NIH HHS/ -- HL36162/HL/NHLBI NIH HHS/ -- HL51366/HL/NHLBI NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1997 Nov 21;278(5342):1470-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Perlmutter Laboratory, Children's Hospital, Department of Medicine, Harvard Medical School, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9367961" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antibodies, Monoclonal ; Antigens, CD4/*physiology ; Cell Line ; HIV Antibodies/immunology ; HIV Envelope Protein gp120/chemistry/*metabolism ; HIV-2/immunology ; Humans ; Macaca mulatta ; Macrophages/virology ; *Membrane Glycoproteins ; Mutation ; Receptors, CCR5/chemistry/*metabolism ; Simian Immunodeficiency Virus/*metabolism ; Transfection ; *Viral Envelope Proteins
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    Regulation of protein phosphatase 2A by direct interaction with casein kinase 2alpha (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-05-09
    Description: Timely deactivation of kinase cascades is crucial to the normal control of cell signaling and is partly accomplished by protein phosphatase 2A (PP2A). The catalytic (alpha) subunit of the serine-threonine kinase casein kinase 2 (CK2) bound to PP2A in vitro and in mitogen-starved cells; binding required the integrity of a sequence motif common to CK2alpha and SV40 small t antigen. Overexpression of CK2alpha resulted in deactivation of mitogen-activated protein kinase kinase (MEK) and suppression of cell growth. Moreover, CK2alpha inhibited the transforming activity of oncogenic Ras, but not that of constitutively activated MEK. Thus, CK2alpha may regulate the deactivation of the mitogen-activated protein kinase pathway.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Heriche, J K -- Lebrin, F -- Rabilloud, T -- Leroy, D -- Chambaz, E M -- Goldberg, Y -- New York, N.Y. -- Science. 1997 May 9;276(5314):952-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Commissariat a l'Energie Atomique, Departement de Biologie Moleculaire et Structurale, Laboratoire de Biochimie des Regulations Cellulaires Endocrines, Unite 244, F-38054 Grenoble Cedex 9, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9139659" target="_blank"〉PubMed〈/a〉
    Keywords: 3T3 Cells ; Amino Acid Sequence ; Animals ; Antigens, Polyomavirus Transforming ; Binding Sites ; Casein Kinase II ; Cell Division ; Cell Transformation, Neoplastic ; MAP Kinase Kinase 1 ; Mice ; *Mitogen-Activated Protein Kinase Kinases ; Mutation ; Okadaic Acid/pharmacology ; Phosphoprotein Phosphatases/*metabolism ; Phosphorylation ; Platelet-Derived Growth Factor/pharmacology ; Protein Phosphatase 2 ; Protein-Serine-Threonine Kinases/*metabolism/pharmacology ; Protein-Tyrosine Kinases/metabolism/pharmacology ; Recombinant Fusion Proteins/metabolism ; Transfection ; ras Proteins/pharmacology
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    Activation of beta-catenin-Tcf signaling in colon cancer by mutations in beta-catenin or APC (1997)
    American Association for the Advancement of Science (AAAS)
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    Publication Date: 1997-03-21
    Description: Inactivation of the adenomatous polyposis coli (APC) tumor suppressor gene initiates colorectal neoplasia. One of the biochemical activities associated with the APC protein is down-regulation of transcriptional activation mediated by beta-catenin and T cell transcription factor 4 (Tcf-4). The protein products of mutant APC genes present in colorectal tumors were found to be defective in this activity. Furthermore, colorectal tumors with intact APC genes were found to contain activating mutations of beta-catenin that altered functionally significant phosphorylation sites. These results indicate that regulation of beta-catenin is critical to APC's tumor suppressive effect and that this regulation can be circumvented by mutations in either APC or beta-catenin.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Morin, P J -- Sparks, A B -- Korinek, V -- Barker, N -- Clevers, H -- Vogelstein, B -- Kinzler, K W -- CA57345/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1997 Mar 21;275(5307):1787-90.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Johns Hopkins Oncology Center, 424 North Bond Street, Baltimore, MD 21231, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9065402" target="_blank"〉PubMed〈/a〉
    Keywords: Adenomatous Polyposis Coli Protein ; Colonic Neoplasms/*genetics/metabolism ; Cytoskeletal Proteins/*genetics/*metabolism ; Gene Expression Regulation, Neoplastic ; *Genes, APC ; Genes, Reporter ; Germ-Line Mutation ; Humans ; Mutation ; Phosphorylation ; Signal Transduction ; TCF Transcription Factors ; *Trans-Activators ; Transcription Factor 7-Like 2 Protein ; Transcription Factors/*metabolism ; *Transcription, Genetic ; Transfection ; Tumor Cells, Cultured ; beta Catenin
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    Targeting of HIV- and SIV-infected cells by CD4-chemokine receptor pseudotypes (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-12-31
    Description: Retroviral vectors containing CD4 and an appropriate chemokine receptor were evaluated for the ability to transduce cells infected with human immunodeficiency virus (HIV) and simian immunodeficiency virus (SIV). These CD4-chemokine receptor pseudotypes were able to target HIV- and SIV-infected cell lines and monocyte-derived macrophages in a manner that corresponded to the specificity of the viral envelope glycoprotein for its CD4-chemokine receptor complex. This approach could offer a way to deliver antiviral genes directly to HIV-infected cells in vivo and could provide an additional treatment strategy in conjunction with existing antiviral therapies.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Endres, M J -- Jaffer, S -- Haggarty, B -- Turner, J D -- Doranz, B J -- O'Brien, P J -- Kolson, D L -- Hoxie, J A -- AI33854/AI/NIAID NIH HHS/ -- AI40880/AI/NIAID NIH HHS/ -- HL 07439/HL/NHLBI NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1997 Nov 21;278(5342):1462-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, Hematology-Oncology Division, University of Pennsylvania, Philadelphia, PA 19104, USA. endres@mail.med.upenn.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9367958" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD4/*genetics/metabolism ; Cell Line ; Gene Products, env/metabolism ; *Gene Transfer Techniques ; *Genetic Vectors ; HIV-1/*physiology ; Humans ; Macrophages/virology ; Plasmids ; Receptors, CCR5/genetics/metabolism ; Receptors, CXCR4/genetics/metabolism ; Receptors, Chemokine/*genetics/metabolism ; Simian Immunodeficiency Virus/*physiology ; Transfection
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    Prevention of apoptosis by Bcl-2: release of cytochrome c from mitochondria blocked (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-02-21
    Description: Bcl-2 is an integral membrane protein located mainly on the outer membrane of mitochondria. Overexpression of Bcl-2 prevents cells from undergoing apoptosis in response to a variety of stimuli. Cytosolic cytochrome c is necessary for the initiation of the apoptotic program, suggesting a possible connection between Bcl-2 and cytochrome c, which is normally located in the mitochondrial intermembrane space. Cells undergoing apoptosis were found to have an elevation of cytochrome c in the cytosol and a corresponding decrease in the mitochondria. Overexpression of Bcl-2 prevented the efflux of cytochrome c from the mitochondria and the initiation of apoptosis. Thus, one possible role of Bcl-2 in prevention of apoptosis is to block cytochrome c release from mitochondria.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yang, J -- Liu, X -- Bhalla, K -- Kim, C N -- Ibrado, A M -- Cai, J -- Peng, T I -- Jones, D P -- Wang, X -- New York, N.Y. -- Science. 1997 Feb 21;275(5303):1129-32.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, Emory University School of Medicine, Atlanta, GA 30322, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9027314" target="_blank"〉PubMed〈/a〉
    Keywords: Apoproteins/metabolism ; *Apoptosis ; Caspase 3 ; *Caspases ; Cysteine Endopeptidases/metabolism ; Cytochrome c Group/*metabolism ; Cytochromes c ; Cytosol/metabolism ; DNA Fragmentation ; Enzyme Activation ; Etoposide/pharmacology ; HL-60 Cells ; HeLa Cells ; Humans ; Intracellular Membranes/metabolism ; Membrane Potentials/drug effects ; Mitochondria/*metabolism ; Poly(ADP-ribose) Polymerases/metabolism ; Proto-Oncogene Proteins c-bcl-2/genetics/*metabolism ; Staurosporine/pharmacology ; Transfection
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 80
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    Nuclear export of NF-ATc enhanced by glycogen synthase kinase-3 (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-03-28
    Description: The transcription factor NF-AT responds to Ca2+-calcineurin signals by translocating to the nucleus, where it participates in the activation of early immune response genes. Calcineurin dephosphorylates conserved serine residues in the amino terminus of NF-AT, resulting in nuclear import. Purification of the NF-AT kinase revealed that it is composed of a priming kinase activity and glycogen synthase kinase-3 (GSK-3). GSK-3 phosphorylates conserved serines necessary for nuclear export, promotes nuclear exit, and thereby opposes Ca2+-calcineurin signaling. Because GSK-3 responds to signals initiated by Wnt and other ligands, NF-AT family members could be effectors of these pathways.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Beals, C R -- Sheridan, C M -- Turck, C W -- Gardner, P -- Crabtree, G R -- New York, N.Y. -- Science. 1997 Mar 28;275(5308):1930-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Developmental Biology, Stanford University, Stanford, CA 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9072970" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Biological Transport ; Brain/enzymology ; COS Cells ; Calcineurin ; Calcium/metabolism ; Calcium-Calmodulin-Dependent Protein Kinases/*metabolism ; Calmodulin-Binding Proteins/metabolism ; Cell Nucleus/*metabolism ; Cloning, Molecular ; Cyclic AMP-Dependent Protein Kinases/metabolism ; DNA-Binding Proteins/genetics/*metabolism ; Glycogen Synthase Kinase 3 ; Glycogen Synthase Kinases ; Humans ; Molecular Sequence Data ; NFATC Transcription Factors ; *Nuclear Proteins ; Phosphoprotein Phosphatases/metabolism ; Phosphorylation ; Rats ; Recombinant Fusion Proteins/metabolism ; Signal Transduction ; Transcription Factors/genetics/*metabolism ; Transfection
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 81
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    Activation of SAPK/JNK by TNF receptor 1 through a noncytotoxic TRAF2-dependent pathway (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-01-10
    Description: Interaction of the p55 tumor necrosis factor receptor 1 (TNF-R1)-associated signal transducer TRADD with FADD signals apoptosis, whereas the TNF receptor-associated factor 2 protein (TRAF2) is required for activation of the nuclear transcription factor nuclear factor kappa B. TNF-induced activation of the stress-activated protein kinase (SAPK) was shown to occur through a noncytotoxic TRAF2-dependent pathway. TRAF2 was both sufficient and necessary for activation of SAPK by TNF-R1; conversely, expression of a dominant-negative FADD mutant, which blocks apoptosis, did not interfere with SAPK activation. Therefore, SAPK activation occurs through a pathway that is not required for TNF-R1-induced apoptosis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Natoli, G -- Costanzo, A -- Ianni, A -- Templeton, D J -- Woodgett, J R -- Balsano, C -- Levrero, M -- New York, N.Y. -- Science. 1997 Jan 10;275(5297):200-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Fondazione Andrea Cesalpino and Istituto di I Clinica Medica, Policlinico Umberto I, Viale del Policlinico 155, 00161 Rome, Italy.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8985011" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylcysteine/pharmacology ; *Adaptor Proteins, Signal Transducing ; Apoptosis ; Calcium-Calmodulin-Dependent Protein Kinases/*metabolism ; Carrier Proteins/metabolism ; Cell Line ; Dactinomycin/pharmacology ; Enzyme Activation ; Fas-Associated Death Domain Protein ; Free Radical Scavengers/pharmacology ; HeLa Cells ; Humans ; JNK Mitogen-Activated Protein Kinases ; *MAP Kinase Kinase Kinase 1 ; *Mitogen-Activated Protein Kinases ; NF-kappa B/metabolism ; Protein-Serine-Threonine Kinases/metabolism ; Proteins/*metabolism ; Reactive Oxygen Species/metabolism ; Receptors, Tumor Necrosis Factor/*metabolism ; Recombinant Proteins/pharmacology ; Signal Transduction ; TNF Receptor-Associated Factor 1 ; TNF Receptor-Associated Factor 2 ; Transfection ; Tumor Necrosis Factor-alpha/*pharmacology
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 82
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    An antagonist decoy receptor and a death domain-containing receptor for TRAIL (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-08-08
    Description: TRAIL, also called Apo2L, is a cytotoxic protein that induces apoptosis of many transformed cell lines but not of normal tissues, even though its death domain-containing receptor, DR4, is expressed on both cell types. An antagonist decoy receptor (designated as TRID for TRAIL receptor without an intracellular domain) that may explain the resistant phenotype of normal tissues was identified. TRID is a distinct gene product with an extracellular TRAIL-binding domain and a transmembrane domain but no intracellular signaling domain. TRID transcripts were detected in many normal human tissues but not in most cancer cell lines examined. Ectopic expression of TRID protected mammalian cells from TRAIL-induced apoptosis, which is consistent with a protective role. Another death domain-containing receptor for TRAIL (designated as death receptor-5), which preferentially engaged a FLICE (caspase-8)-related death protease, was also identified.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pan, G -- Ni, J -- Wei, Y F -- Yu, G -- Gentz, R -- Dixit, V M -- ES08111/ES/NIEHS NIH HHS/ -- New York, N.Y. -- Science. 1997 Aug 8;277(5327):815-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, University of Michigan Medical School, Ann Arbor, MI, 48109, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9242610" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; *Apoptosis ; Apoptosis Regulatory Proteins ; Caspase 10 ; Caspase 8 ; Caspase 9 ; *Caspases ; Cell Line, Transformed ; Cysteine Endopeptidases/metabolism ; GPI-Linked Proteins ; HeLa Cells ; Humans ; Ligands ; Membrane Glycoproteins/*metabolism ; Molecular Sequence Data ; Protein Sorting Signals ; Receptors, TNF-Related Apoptosis-Inducing Ligand ; Receptors, Tumor Necrosis Factor/chemistry/genetics/*metabolism ; Sequence Alignment ; Signal Transduction ; TNF-Related Apoptosis-Inducing Ligand ; Transfection ; Tumor Cells, Cultured ; Tumor Necrosis Factor Decoy Receptors ; Tumor Necrosis Factor-alpha/*metabolism
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 83
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    The receptor for the cytotoxic ligand TRAIL (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-04-04
    Description: TRAIL (also known as Apo-2L) is a member of the tumor necrosis factor (TNF) ligand family that rapidly induces apoptosis in a variety of transformed cell lines. The human receptor for TRAIL was found to be an undescribed member of the TNF-receptor family (designated death receptor-4, DR4) that contains a cytoplasmic "death domain" capable of engaging the cell suicide apparatus but not the nuclear factor kappa B pathway in the system studied. Unlike Fas, TNFR-1, and DR3, DR4 could not use FADD to transmit the death signal, suggesting the use of distinct proximal signaling machinery. Thus, the DR4-TRAIL axis defines another receptor-ligand pair involved in regulating cell suicide and tissue homeostasis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pan, G -- O'Rourke, K -- Chinnaiyan, A M -- Gentz, R -- Ebner, R -- Ni, J -- Dixit, V M -- DAMD17-96-1-6085/DA/NIDA NIH HHS/ -- ES08111/ES/NIEHS NIH HHS/ -- New York, N.Y. -- Science. 1997 Apr 4;276(5309):111-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, University of Michigan Medical School, Ann Arbor, MI 48109, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9082980" target="_blank"〉PubMed〈/a〉
    Keywords: *Adaptor Proteins, Signal Transducing ; Amino Acid Sequence ; *Apoptosis ; Apoptosis Regulatory Proteins ; Carrier Proteins/metabolism ; Cell Line ; Fas-Associated Death Domain Protein ; Humans ; Ligands ; Membrane Glycoproteins/*metabolism ; Molecular Sequence Data ; NF-kappa B/metabolism ; Proteins/metabolism ; RNA, Messenger/genetics/metabolism ; Receptor-Interacting Protein Serine-Threonine Kinases ; Receptors, TNF-Related Apoptosis-Inducing Ligand ; Receptors, Tumor Necrosis Factor/chemistry/genetics/*metabolism ; Recombinant Fusion Proteins/metabolism ; Signal Transduction ; TNF Receptor-Associated Factor 1 ; TNF-Related Apoptosis-Inducing Ligand ; Transfection ; Tumor Cells, Cultured ; Tumor Necrosis Factor-alpha/*metabolism
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 84
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    Maintenance of human T cell anergy: blocking of IL-2 gene transcription by activated Rap1 (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-10-06
    Description: In the absence of costimulation, T cells activated through their antigen receptor become unresponsive (anergic) and do not transcribe the gene encoding interleukin-2 (IL-2) when restimulated with antigen. Anergic alloantigen-specific human T cells contained phosphorylated Cbl that coimmunoprecipitated with Fyn. The adapter protein CrkL was associated with both phosphorylated Cbl and the guanidine nucleotide-releasing factor C3G, which catalyzes guanosine triphosphate (GTP) exchange on Rap1. Active Rap1 (GTP-bound form) was present in anergic cells. Forced expression of low amounts of Rap1-GTP in Jurkat T cells recapitulated the anergic defect and blocked T cell antigen receptor (TCR)- and CD28-mediated IL-2 gene transcription. Therefore, Rap1 functions as a negative regulator of TCR-mediated IL-2 gene transcription and may be responsible for the specific defect in IL-2 production in T cell anergy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Boussiotis, V A -- Freeman, G J -- Berezovskaya, A -- Barber, D L -- Nadler, L M -- AI 35225/AI/NIAID NIH HHS/ -- AI39671/AI/NIAID NIH HHS/ -- HL 54785/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1997 Oct 3;278(5335):124-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Adult Oncology, Dana-Farber Cancer Institute, Harvard Medical School, Boston, MA 02115, USA. vassiliki_boussiotis@macmailgw.dfci.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9311917" target="_blank"〉PubMed〈/a〉
    Keywords: *Adaptor Proteins, Signal Transducing ; Antigens, CD28/immunology ; *Clonal Anergy ; GTP-Binding Proteins/*metabolism ; Gene Expression Regulation ; Guanine Nucleotide Exchange Factors ; Guanosine Triphosphate/metabolism ; Humans ; Interleukin-2/*genetics ; Jurkat Cells ; Nuclear Proteins/metabolism ; Phosphorylation ; Protein-Tyrosine Kinases/metabolism ; Proteins/metabolism ; Proto-Oncogene Proteins/metabolism ; Proto-Oncogene Proteins c-cbl ; Proto-Oncogene Proteins c-fyn ; Receptors, Antigen, T-Cell/immunology ; Recombinant Fusion Proteins/metabolism ; Signal Transduction ; T-Lymphocytes/*immunology/metabolism ; *Transcription, Genetic ; Transfection ; *Ubiquitin-Protein Ligases ; rap GTP-Binding Proteins ; ras Guanine Nucleotide Exchange Factors ; ras Proteins/metabolism ; src Homology Domains
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  • 85
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    Defective TNF-alpha-induced apoptosis in STAT1-null cells due to low constitutive levels of caspases (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-12-31
    Description: Signal transducers and activators of transcription (STATs) enhance transcription of specific genes in response to cytokines and growth factors. STAT1 is also required for efficient constitutive expression of the caspases Ice, Cpp32, and Ich-1 in human fibroblasts. As a consequence, STAT1-null cells are resistant to apoptosis by tumor necrosis factor alpha (TNF-alpha). Reintroduction of STAT1alpha restored both TNF-alpha-induced apoptosis and the expression of Ice, Cpp32, and Ich-1. Variant STAT1 proteins carrying point mutations that inactivate domains required for STAT dimer formation nevertheless restored protease expression and sensitivity to apoptosis, indicating that the functions of STAT1 required for these activities are different from those that mediate induced gene expression.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kumar, A -- Commane, M -- Flickinger, T W -- Horvath, C M -- Stark, G R -- P01 CA62220/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1997 Nov 28;278(5343):1630-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Biology, Lerner Research Institute, The Cleveland Clinic Foundation, Cleveland, OH 44195, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9374464" target="_blank"〉PubMed〈/a〉
    Keywords: *Apoptosis ; Caspase 1 ; Caspase 2 ; Caspase 3 ; *Caspases ; Cell Line ; Cysteine Endopeptidases/genetics/*metabolism ; DNA-Binding Proteins/chemistry/genetics/*metabolism ; Dactinomycin/pharmacology ; Dimerization ; Gene Expression Regulation, Enzymologic ; Humans ; Interferon-gamma/pharmacology ; Phosphorylation ; Point Mutation ; Proteins/genetics/*metabolism ; STAT1 Transcription Factor ; Signal Transduction ; Trans-Activators/chemistry/genetics/*metabolism ; Transfection ; Tumor Necrosis Factor-alpha/*pharmacology
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 86
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    LKLF: A transcriptional regulator of single-positive T cell quiescence and survival (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-09-26
    Description: Mature single-positive (SP) T lymphocytes enter a "resting" state in which they are proliferatively quiescent and relatively resistant to apoptosis. The molecular mechanisms regulating this quiescent phenotype were unknown. Here it was found that the expression of a Kruppel-like zinc finger transcription factor, lung Kruppel-like factor (LKLF), is developmentally induced during the maturation of SP quiescent T cells and rapidly extinguished after SP T cell activation. LKLF-deficient T cells produced by gene targeting had a spontaneously activated phenotype and died in the spleen and lymph nodes from Fas ligand-induced apoptosis. Thus, LKLF is required to program the quiescent state of SP T cells and to maintain their viability in the peripheral lymphoid organs and blood.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kuo, C T -- Veselits, M L -- Leiden, J M -- AI29637/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1997 Sep 26;277(5334):1986-90.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, University of Chicago, Chicago, IL 60637, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9302292" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD95/biosynthesis ; Apoptosis ; B-Lymphocytes/metabolism ; Cell Survival ; Chimera ; Fas Ligand Protein ; Gene Deletion ; Gene Targeting ; *Interphase ; Kruppel-Like Transcription Factors ; Lymph Nodes/cytology ; Lymphocyte Activation ; Membrane Glycoproteins/biosynthesis ; Mice ; Mice, Inbred C57BL ; Spleen/cytology ; T-Lymphocyte Subsets/metabolism ; T-Lymphocytes/*cytology/*immunology/metabolism ; Trans-Activators/biosynthesis/genetics/*physiology ; Transfection ; *Zinc Fingers
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  • 87
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    A TEL-JAK2 fusion protein with constitutive kinase activity in human leukemia (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-11-21
    Description: The Janus family of tyrosine kinases (JAK) plays an essential role in development and in coupling cytokine receptors to downstream intracellular signaling events. A t(9;12)(p24;p13) chromosomal translocation in a T cell childhood acute lymphoblastic leukemia patient was characterized and shown to fuse the 3' portion of JAK2 to the 5' region of TEL, a gene encoding a member of the ETS transcription factor family. The TEL-JAK2 fusion protein includes the catalytic domain of JAK2 and the TEL-specific oligomerization domain. TEL-induced oligomerization of TEL-JAK2 resulted in the constitutive activation of its tyrosine kinase activity and conferred cytokine-independent proliferation to the interleukin-3-dependent Ba/F3 hematopoietic cell line.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lacronique, V -- Boureux, A -- Valle, V D -- Poirel, H -- Quang, C T -- Mauchauffe, M -- Berthou, C -- Lessard, M -- Berger, R -- Ghysdael, J -- Bernard, O A -- New York, N.Y. -- Science. 1997 Nov 14;278(5341):1309-12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉U 301 de l'Institut National de la Sante et de la Recherche Medicale and SD 401 No. 301 CNRS, Institut de Genetique Moleculaire, 27 rue Juliette Dodu, 75010 Paris, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9360930" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Biopolymers ; Cell Division ; Cell Line ; Child, Preschool ; DNA-Binding Proteins/chemistry/genetics/metabolism ; Enzyme Activation ; Humans ; Interleukin-3/physiology ; Janus Kinase 2 ; Leukemia-Lymphoma, Adult T-Cell/genetics/*metabolism ; Male ; Mice ; *Milk Proteins ; Molecular Sequence Data ; Oncogene Proteins, Fusion/chemistry/genetics/*metabolism ; Phosphorylation ; Protein-Tyrosine Kinases/chemistry/genetics/*metabolism ; *Proto-Oncogene Proteins ; Proto-Oncogene Proteins c-ets ; *Repressor Proteins ; STAT5 Transcription Factor ; Signal Transduction ; Trans-Activators/metabolism ; Transcription Factors/chemistry/genetics/metabolism ; Transfection ; Translocation, Genetic
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  • 88
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    Controlling cell death (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-02-21
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Golstein, P -- New York, N.Y. -- Science. 1997 Feb 21;275(5303):1081-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre d'Immunologie INSERM-CNRS de Marseille-Luminy, France. golstein@ciml.univ-mrs.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9054009" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Apoptosis ; Apoptosis Regulatory Proteins ; Caenorhabditis elegans/cytology/metabolism ; *Caenorhabditis elegans Proteins ; Calcium-Binding Proteins/metabolism ; Caspase 1 ; *Caspases ; Cysteine Endopeptidases/metabolism ; Cytochrome c Group/metabolism ; Cytosol/metabolism ; Helminth Proteins/metabolism ; Membrane Glycoproteins/metabolism ; Mitochondria/metabolism ; Perforin ; Pore Forming Cytotoxic Proteins ; Proto-Oncogene Proteins/metabolism ; Proto-Oncogene Proteins c-bcl-2/metabolism ; Signal Transduction ; Transfection ; bcl-X Protein
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  • 89
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    Tyrosine phosphorylation of transmembrane ligands for Eph receptors (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-03-14
    Description: Axonal pathfinding in the nervous system is mediated in part by cell-to-cell signaling events involving members of the Eph receptor tyrosine kinase (RTK) family and their membrane-bound ligands. Genetic evidence suggests that transmembrane ligands may transduce signals in the developing embryo. The cytoplasmic domain of the transmembrane ligand Lerk2 became phosphorylated on tyrosine residues after contact with the Nuk/Cek5 receptor ectodomain, which suggests that Lerk2 has receptorlike intrinsic signaling potential. Moreover, Lerk2 is an in vivo substrate for the platelet-derived growth factor receptor, which suggests crosstalk between Lerk2 signaling and signaling cascades activated by tyrosine kinases. It is proposed that transmembrane ligands of Eph receptors act not only as conventional RTK ligands but also as receptorlike signaling molecules.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bruckner, K -- Pasquale, E B -- Klein, R -- EY10576/EY/NEI NIH HHS/ -- New York, N.Y. -- Science. 1997 Mar 14;275(5306):1640-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉European Molecular Biology Laboratory, Meyerhofstrasse 1, 69117 Heidelberg, Germany. USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9054357" target="_blank"〉PubMed〈/a〉
    Keywords: 3T3 Cells ; Animals ; Axons/physiology ; Brain-Derived Neurotrophic Factor/metabolism ; Cell Membrane/*metabolism ; Embryo, Mammalian/metabolism ; Ephrin-B1 ; Ligands ; Mice ; Phosphorylation ; Phosphotyrosine/*metabolism ; Platelet-Derived Growth Factor/pharmacology ; Proteins/*metabolism/pharmacology ; Receptor Protein-Tyrosine Kinases/*metabolism ; Receptor, Ciliary Neurotrophic Factor ; Receptor, EphB2 ; Receptors, Nerve Growth Factor/metabolism ; Receptors, Platelet-Derived Growth Factor/metabolism ; Recombinant Fusion Proteins/metabolism ; Signal Transduction ; Transfection
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  • 90
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    Phosphorylation of the translational repressor PHAS-I by the mammalian target of rapamycin (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-07-04
    Description: The immunosuppressant rapamycin interferes with G1-phase progression in lymphoid and other cell types by inhibiting the function of the mammalian target of rapamycin (mTOR). mTOR was determined to be a terminal kinase in a signaling pathway that couples mitogenic stimulation to the phosphorylation of the eukaryotic initiation factor (eIF)-4E-binding protein, PHAS-I. The rapamycin-sensitive protein kinase activity of mTOR was required for phosphorylation of PHAS-I in insulin-stimulated human embryonic kidney cells. mTOR phosphorylated PHAS-I on serine and threonine residues in vitro, and these modifications inhibited the binding of PHAS-I to eIF-4E. These studies define a role for mTOR in translational control and offer further insights into the mechanism whereby rapamycin inhibits G1-phase progression in mammalian cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brunn, G J -- Hudson, C C -- Sekulic, A -- Williams, J M -- Hosoi, H -- Houghton, P J -- Lawrence, J C Jr -- Abraham, R T -- AR41189/AR/NIAMS NIH HHS/ -- DK28312/DK/NIDDK NIH HHS/ -- DK50628/DK/NIDDK NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1997 Jul 4;277(5322):99-101.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology, University of Virginia School of Medicine, Charlottesville, VA 22908, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9204908" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptor Proteins, Signal Transducing ; Androstadienes/pharmacology ; Animals ; Carrier Proteins/pharmacology ; Cell Line ; DNA-Binding Proteins/pharmacology ; Eukaryotic Initiation Factor-4E ; G1 Phase ; Heat-Shock Proteins/pharmacology ; Humans ; Insulin/pharmacology ; Peptide Initiation Factors/metabolism ; Phosphoproteins/genetics/*metabolism ; Phosphorylation ; Phosphotransferases (Alcohol Group Acceptor)/antagonists & inhibitors/*metabolism ; Polyenes/*pharmacology ; *Protein Kinases ; Rats ; Recombinant Proteins/metabolism ; Repressor Proteins/genetics/*metabolism ; Signal Transduction ; Sirolimus ; TOR Serine-Threonine Kinases ; Tacrolimus Binding Proteins ; Transfection ; Tumor Cells, Cultured
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 91
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    Niemann-Pick C1 disease gene: homology to mediators of cholesterol homeostasis (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-07-11
    Description: Niemann-Pick type C (NP-C) disease, a fatal neurovisceral disorder, is characterized by lysosomal accumulation of low density lipoprotein (LDL)-derived cholesterol. By positional cloning methods, a gene (NPC1) with insertion, deletion, and missense mutations has been identified in NP-C patients. Transfection of NP-C fibroblasts with wild-type NPC1 cDNA resulted in correction of their excessive lysosomal storage of LDL cholesterol, thereby defining the critical role of NPC1 in regulation of intracellular cholesterol trafficking. The 1278-amino acid NPC1 protein has sequence similarity to the morphogen receptor PATCHED and the putative sterol-sensing regions of SREBP cleavage-activating protein (SCAP) and 3-hydroxy-3-methyl-glutaryl coenzyme A (HMG-CoA) reductase.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Carstea, E D -- Morris, J A -- Coleman, K G -- Loftus, S K -- Zhang, D -- Cummings, C -- Gu, J -- Rosenfeld, M A -- Pavan, W J -- Krizman, D B -- Nagle, J -- Polymeropoulos, M H -- Sturley, S L -- Ioannou, Y A -- Higgins, M E -- Comly, M -- Cooney, A -- Brown, A -- Kaneski, C R -- Blanchette-Mackie, E J -- Dwyer, N K -- Neufeld, E B -- Chang, T Y -- Liscum, L -- Strauss, J F 3rd -- Ohno, K -- Zeigler, M -- Carmi, R -- Sokol, J -- Markie, D -- O'Neill, R R -- van Diggelen, O P -- Elleder, M -- Patterson, M C -- Brady, R O -- Vanier, M T -- Pentchev, P G -- Tagle, D A -- New York, N.Y. -- Science. 1997 Jul 11;277(5323):228-31.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Institute of Neurological Disorders and Stroke, National Institutes of Health, Bethesda, MD 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9211849" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; *Carrier Proteins ; Cholesterol/*metabolism ; Cholesterol, LDL/metabolism ; Chromosome Mapping ; Chromosomes, Human, Pair 18 ; Cloning, Molecular ; *Drosophila Proteins ; Homeostasis ; Humans ; Hydroxymethylglutaryl CoA Reductases/chemistry ; Insect Proteins/chemistry ; Intracellular Signaling Peptides and Proteins ; Lysosomes/metabolism ; *Membrane Glycoproteins ; Membrane Proteins/chemistry ; Molecular Sequence Data ; Mutation ; Niemann-Pick Diseases/*genetics/metabolism ; Polymorphism, Single-Stranded Conformational ; Proteins/chemistry/*genetics/physiology ; Receptors, Cell Surface/chemistry ; Sequence Homology, Amino Acid ; Transfection
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  • 92
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    Activation of interferon-gamma inducing factor mediated by interleukin-1beta converting enzyme (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-01-10
    Description: The interleukin-1beta (IL-1beta) converting enzyme (ICE) processes the inactive IL-1beta precursor to the proinflammatory cytokine. ICE was also shown to cleave the precursor of interferon-gamma inducing factor (IGIF) at the authentic processing site with high efficiency, thereby activating IGIF and facilitating its export. Lipopolysaccharide-activated ICE-deficient (ICE-/-) Kupffer cells synthesized the IGIF precursor but failed to process it into the active form. Interferon-gamma and IGIF were diminished in the sera of ICE-/- mice exposed to Propionibacterium acnes and lipopolysaccharide. The lack of multiple proinflammatory cytokines in ICE-/- mice may account for their protection from septic shock.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gu, Y -- Kuida, K -- Tsutsui, H -- Ku, G -- Hsiao, K -- Fleming, M A -- Hayashi, N -- Higashino, K -- Okamura, H -- Nakanishi, K -- Kurimoto, M -- Tanimoto, T -- Flavell, R A -- Sato, V -- Harding, M W -- Livingston, D J -- Su, M S -- New York, N.Y. -- Science. 1997 Jan 10;275(5297):206-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Vertex Pharmaceuticals, Inc., 130 Waverly Street, Cambridge, MA 02139, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8999548" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; COS Cells ; Caspase 1 ; Caspase 3 ; *Caspases ; Caspases, Initiator ; Culture Media, Conditioned ; Cysteine Endopeptidases/*metabolism ; Cytokines/blood/*metabolism/pharmacology ; Humans ; Interferon-gamma/biosynthesis/blood ; Interleukin-18 ; Kupffer Cells/*metabolism ; Lipopolysaccharides/pharmacology ; Mice ; Protein Precursors/metabolism ; Protein Processing, Post-Translational ; Recombinant Proteins/metabolism/pharmacology ; Spleen/cytology/metabolism ; Transfection
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 93
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    Regulation of NF-kappaB by cyclin-dependent kinases associated with the p300 coactivator (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-01-24
    Description: The nuclear factor kappaB (NF-kappaB) transcription factor is responsive to specific cytokines and stress and is often activated in association with cell damage and growth arrest in eukaryotes. NF-kappaB is a heterodimeric protein, typically composed of 50- and 65-kilodalton subunits of the Rel family, of which RelA(p65) stimulates transcription of diverse genes. Specific cyclin-dependent kinases (CDKs) were found to regulate transcriptional activation by NF-kappaB through interactions with the coactivator p300. The transcriptional activation domain of RelA(p65) interacted with an amino-terminal region of p300 distinct from a carboxyl-terminal region of p300 required for binding to the cyclin E-Cdk2 complex. The CDK inhibitor p21 or a dominant negative Cdk2, which inhibited p300-associated cyclin E-Cdk2 activity, stimulated kappaB-dependent gene expression, which was also enhanced by expression of p300 in the presence of p21. The interaction of NF-kappaB and CDKs through the p300 and CBP coactivators provides a mechanism for the coordination of transcriptional activation with cell cycle progression.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Perkins, N D -- Felzien, L K -- Betts, J C -- Leung, K -- Beach, D H -- Nabel, G J -- R01 AI29179/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1997 Jan 24;275(5299):523-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, University of Michigan Medical Center, 4520 MSRB I, 1150 West Medical Center Drive, Ann Arbor, MI 48109, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8999795" target="_blank"〉PubMed〈/a〉
    Keywords: *CDC2-CDC28 Kinases ; Cell Cycle ; Cell Line ; Cyclin-Dependent Kinase 2 ; Cyclin-Dependent Kinase Inhibitor p21 ; Cyclin-Dependent Kinases/genetics/*metabolism ; Cyclins/genetics/metabolism ; Genes, Reporter ; Humans ; Jurkat Cells ; NF-kappa B/genetics/*metabolism ; Nuclear Proteins/genetics/*metabolism ; Phosphorylation ; Protein Kinases/metabolism ; Protein-Serine-Threonine Kinases/genetics/*metabolism ; Signal Transduction ; Tetradecanoylphorbol Acetate/pharmacology ; *Trans-Activators ; Transcription Factor RelA ; Transcription Factors/genetics/*metabolism ; *Transcriptional Activation ; Transfection
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 94
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    Specific inhibition of Stat3 signal transduction by PIAS3 (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-12-31
    Description: The signal transducer and activator of transcription-3 (Stat3) protein is activated by the interleukin 6 (IL-6) family of cytokines, epidermal growth factor, and leptin. A protein named PIAS3 (protein inhibitor of activated STAT) that binds to Stat3 was isolated and characterized. The association of PIAS3 with Stat3 in vivo was only observed in cells stimulated with ligands that cause the activation of Stat3. PIAS3 blocked the DNA-binding activity of Stat3 and inhibited Stat3-mediated gene activation. Although Stat1 is also phosphorylated in response to IL-6, PIAS3 did not interact with Stat1 or affect its DNA-binding or transcriptional activity. The results indicate that PIAS3 is a specific inhibitor of Stat3.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chung, C D -- Liao, J -- Liu, B -- Rao, X -- Jay, P -- Berta, P -- Shuai, K -- AI39612/AI/NIAID NIH HHS/ -- T32CA09056/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1997 Dec 5;278(5344):1803-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Chemistry, University of California, Los Angeles, CA 90095, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9388184" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Carrier Proteins/chemistry/genetics/*metabolism/pharmacology ; Cell Line ; DNA/metabolism ; DNA-Binding Proteins/genetics/*metabolism ; Gene Expression Regulation ; Humans ; Interferon Regulatory Factor-1 ; Interferon-alpha/pharmacology ; Interleukin-6/pharmacology ; *Intracellular Signaling Peptides and Proteins ; Mice ; Molecular Sequence Data ; NF-kappa B/metabolism ; Phosphoproteins/genetics ; Phosphorylation ; Phosphotyrosine/metabolism ; Protein Inhibitors of Activated STAT ; Recombinant Fusion Proteins/pharmacology ; STAT1 Transcription Factor ; STAT3 Transcription Factor ; *Signal Transduction ; Trans-Activators/*metabolism ; Transcriptional Activation ; Transfection ; Tumor Cells, Cultured ; Tumor Necrosis Factor-alpha/pharmacology
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 95
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    Linkage of G protein-coupled receptors to the MAPK signaling pathway through PI 3-kinase gamma (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-01-17
    Description: The tyrosine kinase class of receptors induces mitogen-activated protein kinase (MAPK) activation through the sequential interaction of the signaling proteins Grb2, Sos, Ras, Raf, and MEK. Receptors coupled to heterotrimeric guanine triphosphate-binding protein (G protein) stimulate MAPK through Gbetagamma subunits, but the subsequent intervening molecules are still poorly defined. Overexpression of phosphoinositide 3-kinase gamma (PI3Kgamma) in COS-7 cells activated MAPK in a Gbetagamma-dependent fashion, and expression of a catalytically inactive mutant of PI3Kgamma abolished the stimulation of MAPK by Gbetagamma or in response to stimulation of muscarinic (m2) G protein-coupled receptors. Signaling from PI3Kgamma to MAPK appears to require a tyrosine kinase, Shc, Grb2, Sos, Ras, and Raf. These findings indicate that PI3Kgamma mediates Gbetagamma-dependent regulation of the MAPK signaling pathway.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lopez-Ilasaca, M -- Crespo, P -- Pellici, P G -- Gutkind, J S -- Wetzker, R -- New York, N.Y. -- Science. 1997 Jan 17;275(5298):394-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Max Planck Research Unit Molecular Cell Biology, Medical Faculty, University of Jena, 07747 Jena, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8994038" target="_blank"〉PubMed〈/a〉
    Keywords: *Adaptor Proteins, Signal Transducing ; Androstadienes/pharmacology ; Animals ; COS Cells ; Calcium-Calmodulin-Dependent Protein Kinases/*metabolism ; Carbachol/pharmacology ; Cell Membrane/enzymology ; Enzyme Activation ; GRB2 Adaptor Protein ; GTP-Binding Proteins/*metabolism ; Guanine Nucleotide Exchange Factors ; Mitogen-Activated Protein Kinase 1 ; Phosphatidylinositol 3-Kinases ; Phosphorylation ; Phosphotransferases (Alcohol Group Acceptor)/*metabolism ; Proteins/metabolism ; Receptor Protein-Tyrosine Kinases/metabolism ; Receptor, Muscarinic M2 ; Receptors, Muscarinic/metabolism ; Recombinant Fusion Proteins/metabolism ; *Signal Transduction ; Transfection ; Tyrosine/metabolism ; ras Guanine Nucleotide Exchange Factors ; ras Proteins/metabolism
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  • 96
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    Mariner sails into Leishmania (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-06-13
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hartl, D L -- New York, N.Y. -- Science. 1997 Jun 13;276(5319):1659-60.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, MA 02138, USA. dhartl@oeb.harvard.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9206830" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; DNA Nucleotidyltransferases/chemistry/*genetics ; *DNA Transposable Elements ; Drosophila/genetics ; Genes, Protozoan ; Genome, Protozoan ; Leishmania major/*genetics ; Mutagenesis, Insertional ; Transfection ; Transposases
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  • 97
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    Induction of apoptosis by ASK1, a mammalian MAPKKK that activates SAPK/JNK and p38 signaling pathways (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-01-03
    Description: Mitogen-activated protein (MAP) kinase cascades are activated in response to various extracellular stimuli, including growth factors and environmental stresses. A MAP kinase kinase kinase (MAPKKK), termed ASK1, was identified that activated two different subgroups of MAP kinase kinases (MAPKK), SEK1 (or MKK4) and MKK3/MAPKK6 (or MKK6), which in turn activated stress-activated protein kinase (SAPK, also known as JNK; c-Jun amino-terminal kinase) and p38 subgroups of MAP kinases, respectively. Overexpression of ASK1 induced apoptotic cell death, and ASK1 was activated in cells treated with tumor necrosis factor-alpha (TNF-alpha). Moreover, TNF-alpha-induced apoptosis was inhibited by a catalytically inactive form of ASK1. ASK1 may be a key element in the mechanism of stress- and cytokine-induced apoptosis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ichijo, H -- Nishida, E -- Irie, K -- ten Dijke, P -- Saitoh, M -- Moriguchi, T -- Takagi, M -- Matsumoto, K -- Miyazono, K -- Gotoh, Y -- New York, N.Y. -- Science. 1997 Jan 3;275(5296):90-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, The Cancer Institute, Tokyo, Japanese Foundation for Cancer Research, 1-37-1 Kami-Ikebukuro, Toshima-ku, Tokyo 170, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8974401" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; *Apoptosis ; COS Cells ; Calcium-Calmodulin-Dependent Protein Kinases/*metabolism ; Cell Division ; Cell Line ; Cell Survival ; Enzyme Activation ; JNK Mitogen-Activated Protein Kinases ; MAP Kinase Kinase 6 ; MAP Kinase Kinase Kinases ; *Mitogen-Activated Protein Kinase Kinases ; *Mitogen-Activated Protein Kinases ; Molecular Sequence Data ; Phosphorylation ; Polymerase Chain Reaction ; Protein-Serine-Threonine Kinases/chemistry/*metabolism ; Protein-Tyrosine Kinases/metabolism ; Recombinant Proteins/metabolism ; Saccharomyces cerevisiae/genetics/growth & development/metabolism ; *Signal Transduction ; Transfection ; Tumor Necrosis Factor-alpha/pharmacology ; p38 Mitogen-Activated Protein Kinases
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  • 98
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    Mitogenic signaling mediated by oxidants in Ras-transformed fibroblasts (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-03-14
    Description: NIH 3T3 fibroblasts stably transformed with a constitutively active isoform of p21(Ras), H-RasV12 (v-H-Ras or EJ-Ras), produced large amounts of the reactive oxygen species superoxide (.O2-). .O2- production was suppressed by the expression of dominant negative isoforms of Ras or Rac1, as well as by treatment with a farnesyltransferase inhibitor or with diphenylene iodonium, a flavoprotein inhibitor. The mitogenic activity of cells expressing H-RasV12 was inhibited by treatment with the chemical antioxidant N-acetyl-L-cysteine. Mitogen-activated protein kinase (MAPK) activity was decreased and c-Jun N-terminal kinase (JNK) was not activated in H-RasV12-transformed cells. Thus, H-RasV12-induced transformation can lead to the production of .O2- through one or more pathways involving a flavoprotein and Rac1. The implication of a reactive oxygen species, probably .O2-, as a mediator of Ras-induced cell cycle progression independent of MAPK and JNK suggests a possible mechanism for the effects of antioxidants against Ras-induced cellular transformation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Irani, K -- Xia, Y -- Zweier, J L -- Sollott, S J -- Der, C J -- Fearon, E R -- Sundaresan, M -- Finkel, T -- Goldschmidt-Clermont, P J -- HL52315/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1997 Mar 14;275(5306):1649-52.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, Johns Hopkins University School of Medicine, Baltimore, MD 21205, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9054359" target="_blank"〉PubMed〈/a〉
    Keywords: 3T3 Cells ; Acetylcysteine/pharmacology ; Animals ; Antioxidants/pharmacology ; Calcium-Calmodulin-Dependent Protein Kinases/metabolism ; *Cell Cycle ; Cell Line, Transformed ; *Cell Transformation, Neoplastic ; DNA/biosynthesis ; Electron Spin Resonance Spectroscopy ; GTP-Binding Proteins/metabolism ; *Genes, ras ; JNK Mitogen-Activated Protein Kinases ; Mice ; *Mitogen-Activated Protein Kinases ; Oxidation-Reduction ; Proto-Oncogene Proteins p21(ras)/genetics/*metabolism ; Reactive Oxygen Species/*metabolism ; Signal Transduction ; Superoxides/*metabolism ; Transfection ; rac GTP-Binding Proteins
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 99
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    Negative regulation by HLA-DO of MHC class II-restricted antigen processing (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997-10-06
    Description: HLA-DM is a major histocompatibility complex (MHC) class II-like molecule that facilitates antigen processing by catalyzing the exchange of invariant chain-derived peptides (CLIP) from class II molecules for antigenic peptides. HLA-DO is a second class II-like molecule that physically associates with HLA-DM in B cells. HLA-DO was shown to block HLA-DM function. Purified HLA-DM-DO complexes could not promote peptide exchange in vitro. Expression of HLA-DO in a class II+ and DM+, DO- human T cell line caused the accumulation of class II-CLIP complexes, indicating that HLA-DO blocked DM function in vivo and suggesting that HLA-DO is an important modulator of class II-restricted antigen processing.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Denzin, L K -- Sant'Angelo, D B -- Hammond, C -- Surman, M J -- Cresswell, P -- AI14579/AI/NIAID NIH HHS/ -- AI23081/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1997 Oct 3;278(5335):106-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Section of Immunobiology, Howard Hughes Medical Institute, Yale University School of Medicine, 310 Cedar Street, New Haven, CT 06510, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9311912" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; *Antigen Presentation ; Antigens, Differentiation, B-Lymphocyte/metabolism ; B-Lymphocytes/*immunology ; HLA-D Antigens/*metabolism ; HLA-DR3 Antigen/metabolism ; Histocompatibility Antigens Class II/metabolism ; Humans ; Molecular Sequence Data ; *Nuclear Proteins ; T-Lymphocytes/*immunology ; Trans-Activators/genetics ; Transfection ; Tumor Cells, Cultured
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 100
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    Requirement of NF-kappaB activation to suppress p53-independent apoptosis induced by oncogenic Ras (1997)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1997
    Description: The ras proto-oncogene is frequently mutated in human tumors and functions to chronically stimulate signal transduction cascades resulting in the synthesis or activation of specific transcription factors, including Ets, c-Myc, c-Jun, and nuclear factor kappa B (NF-kappaB). These Ras-responsive transcription factors are required for transformation, but the mechanisms by which these proteins facilitate oncogenesis have not been fully established. Oncogenic Ras was shown to initiate a p53-independent apoptotic response that was suppressed through the activation of NF-kappaB. These results provide an explanation for the requirement of NF-kappaB for Ras-mediated oncogenesis and provide evidence that Ras-transformed cells are susceptible to apoptosis even if they do not express the p53 tumor-suppressor gene product.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mayo, M W -- Wang, C Y -- Cogswell, P C -- Rogers-Graham, K S -- Lowe, S W -- Der, C J -- Baldwin, A S Jr -- CA13106/CA/NCI NIH HHS/ -- CA52072/CA/NCI NIH HHS/ -- CA72771/CA/NCI NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1997 Dec 5;278(5344):1812-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Lineberger Comprehensive Cancer Center, University of North Carolina School of Medicine, Chapel Hill, NC 27599, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/9388187" target="_blank"〉PubMed〈/a〉
    Keywords: 3T3 Cells ; Adenovirus E1A Proteins/genetics/metabolism ; Animals ; *Apoptosis ; Cell Line, Transformed ; Cell Survival ; *Cell Transformation, Neoplastic ; *Gene Expression Regulation, Neoplastic ; *Genes, p53 ; *Genes, ras ; Mice ; NF-kappa B/*metabolism ; Rats ; Transfection ; Tumor Suppressor Protein p53/physiology
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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