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  • Cell Line  (30)
  • American Association for the Advancement of Science (AAAS)  (30)
  • 2005-2009  (30)
  • 1970-1974
  • 2007  (30)
  • 1972
Collection
Keywords
Publisher
  • American Association for the Advancement of Science (AAAS)  (30)
Years
  • 2005-2009  (30)
  • 1970-1974
Year
  • 1
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    The genomic landscapes of human breast and colorectal cancers (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-10-13
    Description: Human cancer is caused by the accumulation of mutations in oncogenes and tumor suppressor genes. To catalog the genetic changes that occur during tumorigenesis, we isolated DNA from 11 breast and 11 colorectal tumors and determined the sequences of the genes in the Reference Sequence database in these samples. Based on analysis of exons representing 20,857 transcripts from 18,191 genes, we conclude that the genomic landscapes of breast and colorectal cancers are composed of a handful of commonly mutated gene "mountains" and a much larger number of gene "hills" that are mutated at low frequency. We describe statistical and bioinformatic tools that may help identify mutations with a role in tumorigenesis. These results have implications for understanding the nature and heterogeneity of human cancers and for using personal genomics for tumor diagnosis and therapy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wood, Laura D -- Parsons, D Williams -- Jones, Sian -- Lin, Jimmy -- Sjoblom, Tobias -- Leary, Rebecca J -- Shen, Dong -- Boca, Simina M -- Barber, Thomas -- Ptak, Janine -- Silliman, Natalie -- Szabo, Steve -- Dezso, Zoltan -- Ustyanksky, Vadim -- Nikolskaya, Tatiana -- Nikolsky, Yuri -- Karchin, Rachel -- Wilson, Paul A -- Kaminker, Joshua S -- Zhang, Zemin -- Croshaw, Randal -- Willis, Joseph -- Dawson, Dawn -- Shipitsin, Michail -- Willson, James K V -- Sukumar, Saraswati -- Polyak, Kornelia -- Park, Ben Ho -- Pethiyagoda, Charit L -- Pant, P V Krishna -- Ballinger, Dennis G -- Sparks, Andrew B -- Hartigan, James -- Smith, Douglas R -- Suh, Erick -- Papadopoulos, Nickolas -- Buckhaults, Phillip -- Markowitz, Sanford D -- Parmigiani, Giovanni -- Kinzler, Kenneth W -- Velculescu, Victor E -- Vogelstein, Bert -- CA 43460/CA/NCI NIH HHS/ -- CA 57345/CA/NCI NIH HHS/ -- CA109274/CA/NCI NIH HHS/ -- CA112828/CA/NCI NIH HHS/ -- CA121113/CA/NCI NIH HHS/ -- CA62924/CA/NCI NIH HHS/ -- GM070219/GM/NIGMS NIH HHS/ -- GM07309/GM/NIGMS NIH HHS/ -- P30-CA43703/CA/NCI NIH HHS/ -- RR017698/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 2007 Nov 16;318(5853):1108-13. Epub 2007 Oct 11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Ludwig Center for Cancer Genetics and Therapeutics and Howard Hughes Medical Institute at Johns Hopkins Kimmel Cancer Center, Baltimore, MD 21231, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17932254" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Breast Neoplasms/*genetics/metabolism ; Cell Line ; Chromosome Mapping ; Colorectal Neoplasms/*genetics/metabolism ; Computational Biology ; DNA, Neoplasm ; Databases, Genetic ; Genes, Neoplasm ; Genome, Human ; Humans ; Metabolic Networks and Pathways/genetics ; Mice ; Mutation ; Neoplasm Proteins/genetics/metabolism ; Sequence Analysis, DNA
    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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    An X chromosome gene, WTX, is commonly inactivated in Wilms tumor (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-01-06
    Description: Wilms tumor is a pediatric kidney cancer associated with inactivation of the WT1 tumor-suppressor gene in 5 to 10% of cases. Using a high-resolution screen for DNA copy-number alterations in Wilms tumor, we identified somatic deletions targeting a previously uncharacterized gene on the X chromosome. This gene, which we call WTX, is inactivated in approximately one-third of Wilms tumors (15 of 51 tumors). Tumors with mutations in WTX lack WT1 mutations, and both genes share a restricted temporal and spatial expression pattern in normal renal precursors. In contrast to biallelic inactivation of autosomal tumor-suppressor genes, WTX is inactivated by a monoallelic "single-hit" event targeting the single X chromosome in tumors from males and the active X chromosome in tumors from females.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rivera, Miguel N -- Kim, Woo Jae -- Wells, Julie -- Driscoll, David R -- Brannigan, Brian W -- Han, Moonjoo -- Kim, James C -- Feinberg, Andrew P -- Gerald, William L -- Vargas, Sara O -- Chin, Lynda -- Iafrate, A John -- Bell, Daphne W -- Haber, Daniel A -- P01-CA101942/CA/NCI NIH HHS/ -- R37 CA054358/CA/NCI NIH HHS/ -- R37 CA054358-17/CA/NCI NIH HHS/ -- R37-CA058596/CA/NCI NIH HHS/ -- T32-CA009216/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2007 Feb 2;315(5812):642-5. Epub 2007 Jan 4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Massachusetts General Hospital Cancer Center, Harvard Medical Center, Boston, MA 02114, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17204608" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptor Proteins, Signal Transducing ; Alleles ; Amino Acid Sequence ; Animals ; Cell Line ; Chromosome Deletion ; Chromosomes, Human, X/*genetics ; Female ; Gene Expression ; *Gene Silencing ; *Genes, Wilms Tumor ; Heterozygote ; Humans ; In Situ Hybridization, Fluorescence ; Kidney/embryology/metabolism ; Kidney Neoplasms/*genetics ; Male ; Mice ; Mice, Inbred C57BL ; Molecular Sequence Data ; Mutation ; Point Mutation ; Tumor Suppressor Proteins/chemistry/*genetics/physiology ; Wilms Tumor/*genetics ; beta Catenin/genetics
    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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  • 3
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    Serine-7 of the RNA polymerase II CTD is specifically required for snRNA gene expression (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-12-15
    Description: RNA polymerase II (Pol II) transcribes genes that encode proteins and noncoding small nuclear RNAs (snRNAs). The carboxyl-terminal repeat domain (CTD) of the largest subunit of mammalian RNA Pol II, comprising tandem repeats of the heptapeptide consensus Tyr1-Ser2-Pro3-Thr4-Ser5-Pro6-Ser7, is required for expression of both gene types. We show that mutation of serine-7 to alanine causes a specific defect in snRNA gene expression. We also present evidence that phosphorylation of serine-7 facilitates interaction with the snRNA gene-specific Integrator complex. These findings assign a biological function to this amino acid and highlight a gene type-specific requirement for a residue within the CTD heptapeptide, supporting the existence of a CTD code.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2263945/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2263945/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Egloff, Sylvain -- O'Reilly, Dawn -- Chapman, Rob D -- Taylor, Alice -- Tanzhaus, Katrin -- Pitts, Laura -- Eick, Dirk -- Murphy, Shona -- 072107/Wellcome Trust/United Kingdom -- 081312/Wellcome Trust/United Kingdom -- G0400653/Medical Research Council/United Kingdom -- G0400653(71330)/Medical Research Council/United Kingdom -- G9826944/Medical Research Council/United Kingdom -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 2007 Dec 14;318(5857):1777-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/18079403" target="_blank"〉PubMed〈/a〉
    Keywords: Alanine ; Amino Acid Sequence ; Cell Line ; Consensus Sequence ; *Gene Expression Regulation ; Heterogeneous-Nuclear Ribonucleoproteins/genetics ; Humans ; Mutation ; Oligopeptides/chemistry/metabolism ; Phosphorylation ; Protein Structure, Tertiary ; Protein Subunits/genetics/metabolism ; RNA Polymerase II/chemistry/genetics/*metabolism ; RNA Processing, Post-Transcriptional ; RNA, Messenger/genetics/metabolism ; RNA, Small Nuclear/*genetics ; Serine/*metabolism ; Templates, Genetic ; *Transcription, Genetic
    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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  • 4
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    Apoptosis initiated when BH3 ligands engage multiple Bcl-2 homologs, not Bax or Bak (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-02-10
    Description: A central issue in the regulation of apoptosis by the Bcl-2 family is whether its BH3-only members initiate apoptosis by directly binding to the essential cell-death mediators Bax and Bak, or whether they can act indirectly, by engaging their pro-survival Bcl-2-like relatives. Contrary to the direct-activation model, we show that Bax and Bak can mediate apoptosis without discernable association with the putative BH3-only activators (Bim, Bid, and Puma), even in cells with no Bim or Bid and reduced Puma. Our results indicate that BH3-only proteins induce apoptosis at least primarily by engaging the multiple pro-survival relatives guarding Bax and Bak.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Willis, Simon N -- Fletcher, Jamie I -- Kaufmann, Thomas -- van Delft, Mark F -- Chen, Lin -- Czabotar, Peter E -- Ierino, Helen -- Lee, Erinna F -- Fairlie, W Douglas -- Bouillet, Philippe -- Strasser, Andreas -- Kluck, Ruth M -- Adams, Jerry M -- Huang, David C S -- CA43540/CA/NCI NIH HHS/ -- CA80188/CA/NCI NIH HHS/ -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 2007 Feb 9;315(5813):856-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Walter and Eliza Hall Institute of Medical Research, 1G Royal Parade, Parkville, Victoria 3050, Australia.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17289999" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Apoptosis ; Apoptosis Regulatory Proteins/chemistry/genetics/*metabolism ; BH3 Interacting Domain Death Agonist Protein/chemistry/genetics/*metabolism ; Cell Line ; Cells, Cultured ; Humans ; Ligands ; Membrane Proteins/chemistry/genetics/*metabolism ; Mice ; Mice, Knockout ; Models, Biological ; Mutation ; Myeloid Cell Leukemia Sequence 1 Protein ; Neoplasm Proteins/metabolism ; Protein Structure, Tertiary ; Proteins/metabolism ; Proto-Oncogene Proteins/chemistry/genetics/*metabolism ; Proto-Oncogene Proteins c-bcl-2/*metabolism ; Tumor Suppressor Proteins/genetics/metabolism ; bcl-2 Homologous Antagonist-Killer Protein/metabolism ; bcl-2-Associated X Protein/chemistry/*metabolism ; bcl-Associated Death Protein/metabolism ; bcl-X Protein/metabolism
    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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    RAP80 targets BRCA1 to specific ubiquitin structures at DNA damage sites (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-05-26
    Description: Mutations affecting the BRCT domains of the breast cancer-associated tumor suppressor BRCA1 disrupt the recruitment of this protein to DNA double-strand breaks (DSBs). The molecular structures at DSBs recognized by BRCA1 are presently unknown. We report the interaction of the BRCA1 BRCT domain with RAP80, a ubiquitin-binding protein. RAP80 targets a complex containing the BRCA1-BARD1 (BRCA1-associated ring domain protein 1) E3 ligase and the deubiquitinating enzyme (DUB) BRCC36 to MDC1-gammaH2AX-dependent lysine(6)- and lysine(63)-linked ubiquitin polymers at DSBs. These events are required for cell cycle checkpoint and repair responses to ionizing radiation, implicating ubiquitin chain recognition and turnover in the BRCA1-mediated repair of DSBs.〈br /〉〈br /〉〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2706583/" target="_blank"〉〈img src="https://static.pubmed.gov/portal/portal3rc.fcgi/4089621/img/3977009" border="0"〉〈/a〉   〈a href="https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2706583/" target="_blank"〉This paper as free author manuscript - peer-reviewed and accepted for publication〈/a〉〈br /〉〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sobhian, Bijan -- Shao, Genze -- Lilli, Dana R -- Culhane, Aedin C -- Moreau, Lisa A -- Xia, Bing -- Livingston, David M -- Greenberg, Roger A -- K08 CA106597/CA/NCI NIH HHS/ -- K08 CA106597-01A2/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2007 May 25;316(5828):1198-202.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Dana-Farber Cancer Institute and Department of Genetics and Department of Medicine, Harvard Medical School, 44 Binney Street, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17525341" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; BRCA1 Protein/*metabolism ; Binding Sites ; Carrier Proteins/*metabolism ; Cell Line ; DNA/*metabolism ; *DNA Breaks, Double-Stranded ; DNA Repair/physiology ; HeLa Cells ; Humans ; Mice ; Molecular Sequence Data ; Nuclear Proteins/*metabolism ; Nucleic Acid Conformation ; Protein Structure, Tertiary ; Tumor Suppressor Proteins/metabolism ; Ubiquitin/*metabolism ; Ubiquitin-Protein Ligases/metabolism
    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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  • 6
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    A melanocortin 1 receptor allele suggests varying pigmentation among Neanderthals (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-10-27
    Description: The melanocortin 1 receptor (MC1R) regulates pigmentation in humans and other vertebrates. Variants of MC1R with reduced function are associated with pale skin color and red hair in humans of primarily European origin. We amplified and sequenced a fragment of the MC1R gene (mc1r) from two Neanderthal remains. Both specimens have a mutation that was not found in approximately 3700 modern humans analyzed. Functional analyses show that this variant reduces MC1R activity to a level that alters hair and/or skin pigmentation in humans. The impaired activity of this variant suggests that Neanderthals varied in pigmentation levels, potentially on the scale observed in modern humans. Our data suggest that inactive MC1R variants evolved independently in both modern humans and Neanderthals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lalueza-Fox, Carles -- Rompler, Holger -- Caramelli, David -- Staubert, Claudia -- Catalano, Giulio -- Hughes, David -- Rohland, Nadin -- Pilli, Elena -- Longo, Laura -- Condemi, Silvana -- de la Rasilla, Marco -- Fortea, Javier -- Rosas, Antonio -- Stoneking, Mark -- Schoneberg, Torsten -- Bertranpetit, Jaume -- Hofreiter, Michael -- New York, N.Y. -- Science. 2007 Nov 30;318(5855):1453-5. Epub 2007 Oct 25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Departament de Biologia Animal, Universitat de Barcelona, Spain. clalueza@ub.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17962522" target="_blank"〉PubMed〈/a〉
    Keywords: Alleles ; Amino Acid Substitution ; Animals ; Biological Evolution ; Cell Line ; DNA/genetics ; *Fossils ; Hair Color/*genetics ; Hominidae/*genetics ; Humans ; Molecular Sequence Data ; *Mutation ; Polymerase Chain Reaction ; Receptor, Melanocortin, Type 1/chemistry/*genetics/metabolism ; Sequence Analysis, DNA ; Skin Pigmentation/*genetics
    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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  • 7
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    Cysteine redox sensor in PKGIa enables oxidant-induced activation (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-08-25
    Description: Changes in the concentration of oxidants in cells can regulate biochemical signaling mechanisms that control cell function. We have found that guanosine 3',5'-monophosphate (cGMP)-dependent protein kinase (PKG) functions directly as a redox sensor. The Ialpha isoform, PKGIalpha, formed an interprotein disulfide linking its two subunits in cells exposed to exogenous hydrogen peroxide. This oxidation directly activated the kinase in vitro, and in rat cells and tissues. The affinity of the kinase for substrates it phosphorylates was enhanced by disulfide formation. This oxidation-induced activation represents an alternate mechanism for regulation along with the classical activation involving nitric oxide and cGMP. This mechanism underlies cGMP-independent vasorelaxation in response to oxidants in the cardiovascular system and provides a molecular explantion for how hydrogen peroxide can operate as an endothelium-derived hyperpolarizing factor.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Burgoyne, Joseph R -- Madhani, Melanie -- Cuello, Friederike -- Charles, Rebecca L -- Brennan, Jonathan P -- Schroder, Ewald -- Browning, Darren D -- Eaton, Philip -- G0700320/Medical Research Council/United Kingdom -- Wellcome Trust/United Kingdom -- New York, N.Y. -- Science. 2007 Sep 7;317(5843):1393-7. Epub 2007 Aug 23.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cardiology, Cardiovascular Division, King's College London, Rayne Institute, St. Thomas' Hospital, London SE1 7EH, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17717153" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Aorta ; Cell Line ; Cyclic GMP/metabolism ; Cyclic GMP-Dependent Protein Kinase Type I ; Cyclic GMP-Dependent Protein Kinases/genetics/*metabolism ; Cysteine/*metabolism ; Disulfides/metabolism ; Enzyme Activation ; Humans ; Hydrogen Peroxide/metabolism ; Male ; Nitric Oxide/metabolism ; Oxidants/*metabolism ; Oxidation-Reduction ; Oxidative Stress ; Rats ; Rats, Wistar ; Signal Transduction ; Tissue Culture Techniques ; Transfection ; Vasodilation/physiology
    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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  • 8
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    Augmented Wnt signaling in a mammalian model of accelerated aging (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-08-11
    Description: The contribution of stem and progenitor cell dysfunction and depletion in normal aging remains incompletely understood. We explored this concept in the Klotho mouse model of accelerated aging. Analysis of various tissues and organs from young Klotho mice revealed a decrease in stem cell number and an increase in progenitor cell senescence. Because klotho is a secreted protein, we postulated that klotho might interact with other soluble mediators of stem cells. We found that klotho bound to various Wnt family members. In a cell culture model, the Wnt-klotho interaction resulted in the suppression of Wnt biological activity. Tissues and organs from klotho-deficient animals showed evidence of increased Wnt signaling, and ectopic expression of klotho antagonized the activity of endogenous and exogenous Wnt. Both in vitro and in vivo, continuous Wnt exposure triggered accelerated cellular senescence. Thus, klotho appears to be a secreted Wnt antagonist and Wnt proteins have an unexpected role in mammalian aging.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Liu, Hongjun -- Fergusson, Maria M -- Castilho, Rogerio M -- Liu, Jie -- Cao, Liu -- Chen, Jichun -- Malide, Daniela -- Rovira, Ilsa I -- Schimel, Daniel -- Kuo, Calvin J -- Gutkind, J Silvio -- Hwang, Paul M -- Finkel, Toren -- 1 R01 DK069989-01/DK/NIDDK NIH HHS/ -- Intramural NIH HHS/ -- New York, N.Y. -- Science. 2007 Aug 10;317(5839):803-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cardiology Branch, National Heart, Lung, and Blood Institute, NIH, Bethesda, MD 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17690294" target="_blank"〉PubMed〈/a〉
    Keywords: Aging/*physiology ; Animals ; Apoptosis ; Bone Density ; Bone and Bones/metabolism ; Cell Aging/*physiology ; Cell Count ; Cell Line ; Cell Shape ; Glucuronidase/chemistry/genetics/*metabolism ; Humans ; Mice ; Mice, Transgenic ; Protein Structure, Tertiary ; *Signal Transduction ; Stem Cells/cytology/*physiology ; Wnt Proteins/antagonists & inhibitors/*metabolism ; Wnt1 Protein/metabolism ; Wnt3 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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  • 9
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    Targeting of diacylglycerol degradation to M1 muscarinic receptors by beta-arrestins (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-02-03
    Description: Seven-transmembrane receptor (7TMR) signaling is transduced by second messengers such as diacylglycerol (DAG) generated in response to the heterotrimeric guanine nucleotide-binding protein Gq and is terminated by receptor desensitization and degradation of the second messengers. We show that beta-arrestins coordinate both processes for the Gq-coupled M1 muscarinic receptor. beta-Arrestins physically interact with diacylglycerol kinases (DGKs), enzymes that degrade DAG. Moreover, beta-arrestins are essential for conversion of DAG to phosphatidic acid after agonist stimulation, and this activity requires recruitment of the beta-arrestin-DGK complex to activated 7TMRs. The dual function of beta-arrestins, limiting production of diacylglycerol (by receptor desensitization) while enhancing its rate of degradation, is analogous to their ability to recruit adenosine 3',5'-monophosphate phosphodiesterases to Gs-coupled beta2-adrenergic receptors. Thus, beta-arrestins can serve similar regulatory functions for disparate classes of 7TMRs through structurally dissimilar enzymes that degrade chemically distinct second messengers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nelson, Christopher D -- Perry, Stephen J -- Regier, Debra S -- Prescott, Stephen M -- Topham, Matthew K -- Lefkowitz, Robert J -- CA95463/CA/NCI NIH HHS/ -- HL16037/HL/NHLBI NIH HHS/ -- HL70631/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 2007 Feb 2;315(5812):663-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, 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/17272726" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Arrestins/*metabolism ; COS Cells ; Carbachol/pharmacology ; Cell Line ; Cercopithecus aethiops ; Diacylglycerol Kinase/genetics/*metabolism ; Diglycerides/*metabolism ; Humans ; Mutation ; Phosphatidic Acids/metabolism ; Protein Binding ; RNA, Small Interfering ; Receptor, Muscarinic M1/*metabolism ; Recombinant Fusion Proteins/metabolism ; Second Messenger Systems ; *Signal Transduction ; 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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  • 10
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    Wilms tumor suppressor WTX negatively regulates WNT/beta-catenin signaling (2007)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2007-05-19
    Description: Aberrant WNT signal transduction is involved in many diseases. In colorectal cancer and melanoma, mutational disruption of proteins involved in the degradation of beta-catenin, the key effector of the WNT signaling pathway, results in stabilization of beta-catenin and, in turn, activation of transcription. We have used tandem-affinity protein purification and mass spectrometry to define the protein interaction network of the beta-catenin destruction complex. This assay revealed that WTX, a protein encoded by a gene mutated in Wilms tumors, forms a complex with beta-catenin, AXIN1, beta-TrCP2 (beta-transducin repeat-containing protein 2), and APC (adenomatous polyposis coli). Functional analyses in cultured cells, Xenopus, and zebrafish demonstrate that WTX promotes beta-catenin ubiquitination and degradation, which antagonize WNT/beta-catenin signaling. These data provide a possible mechanistic explanation for the tumor suppressor activity of WTX.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Major, Michael B -- Camp, Nathan D -- Berndt, Jason D -- Yi, Xianhua -- Goldenberg, Seth J -- Hubbert, Charlotte -- Biechele, Travis L -- Gingras, Anne-Claude -- Zheng, Ning -- Maccoss, Michael J -- Angers, Stephane -- Moon, Randall T -- New York, N.Y. -- Science. 2007 May 18;316(5827):1043-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, University of Washington School of Medicine, Box 357370, Seattle, WA 98195, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/17510365" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptor Proteins, Signal Transducing ; Adenomatous Polyposis Coli Protein/metabolism ; Animals ; Axin Protein ; Cell Line ; Cell Line, Tumor ; Cell Nucleus/metabolism ; Cytoplasm/metabolism ; Genes, Wilms Tumor ; Humans ; Kidney Neoplasms/genetics ; Protein Binding ; Protein Interaction Mapping ; Proteomics ; RNA Interference ; Recombinant Fusion Proteins/metabolism ; Repressor Proteins/metabolism ; *Signal Transduction ; Transduction, Genetic ; Tumor Suppressor Proteins/chemistry/genetics/*metabolism ; Ubiquitin/metabolism ; Ubiquitin-Protein Ligases/metabolism ; Wilms Tumor/genetics ; Wnt Proteins/*metabolism ; Xenopus Proteins ; Zebrafish ; beta Catenin/*metabolism ; beta-Transducin Repeat-Containing Proteins/metabolism
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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