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  • Articles  (597)
  • Latest Papers from Table of Contents or Articles in Press  (597)
  • Mice  (597)
  • 1990-1994  (597)
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  • 1
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    Premature p34cdc2 activation required for apoptosis (1994)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1994-02-25
    Description: Activation of the serine-threonine kinase p34cdc2 at an inappropriate time during the cell cycle leads to cell death that resembles apoptosis. Premature activation of p34cdc2 was shown to be required for apoptosis induced by a lymphocyte granule protease. The kinase was rapidly activated and tyrosine dephosphorylated at the initiation of apoptosis. DNA fragmentation and nuclear collapse could be prevented by blocking p34cdc2 activity with excess peptide substrate, or by inactivating p34cdc2 in a temperature-sensitive mutant. Premature p34cdc2 activation may be a general mechanism by which cells induced to undergo apoptosis initiate the disruption of the nucleus.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Shi, L -- Nishioka, W K -- Th'ng, J -- Bradbury, E M -- Litchfield, D W -- Greenberg, A H -- New York, N.Y. -- Science. 1994 Feb 25;263(5150):1143-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Manitoba Institute of Cell Biology, University of Manitoba, Winnipeg, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/8108732" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; *Apoptosis ; CDC2 Protein Kinase/*metabolism ; DNA Damage ; Deoxyribonucleases/pharmacology ; Enzyme Activation ; Enzyme Induction ; Membrane Glycoproteins/pharmacology ; Mice ; Mitosis ; Molecular Sequence Data ; Perforin ; Phosphorylation ; Pore Forming Cytotoxic Proteins ; Serine Endopeptidases/pharmacology ; 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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  • 2
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    Induction of cellular senescence in immortalized cells by human chromosome 1 (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-02-09
    Description: The control of cellular senescence by specific human chromosomes was examined in interspecies cell hybrids between diploid human fibroblasts and an immortal, Syrian hamster cell line. Most such hybrids exhibited a limited life span comparable to that of the human fibroblasts, indicating that cellular senescence is dominant in these hybrids. Karyotypic analyses of the hybrid clones that did not senesce revealed that all these clones had lost both copies of human chromosome 1, whereas all other human chromosomes were observed in at least some of the immortal hybrids. The application of selective pressure for retention of human chromosome 1 to the cell hybrids resulted in an increased percentage of hybrids that senesced. Further, the introduction of a single copy of human chromosome 1 to the hamster cells by microcell fusion caused typical signs of cellular senescence. Transfer of chromosome 11 had no effect on the growth of the cells. These findings indicate that human chromosome 1 may participate in the control of cellular senescence and further support a genetic basis for cellular senescence.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sugawara, O -- Oshimura, M -- Koi, M -- Annab, L A -- Barrett, J C -- New York, N.Y. -- Science. 1990 Feb 9;247(4943):707-10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC 27709.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2300822" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Cell Survival/*genetics ; Chromosome Mapping ; *Chromosomes, Human, Pair 1 ; Clone Cells ; Cricetinae ; Diploidy ; Fibroblasts/*cytology ; Humans ; Hybrid Cells/*cytology ; Hypoxanthine Phosphoribosyltransferase/genetics ; Karyotyping ; Mice ; Ploidies ; Transfection ; Translocation, Genetic ; X Chromosome
    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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    T cell reactivity to MHC molecules: immunity versus tolerance (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-06-15
    Description: The specificity of mature CD8+ and CD4+ T lymphocytes is controlled by major histocompatibility complex (MHC) class I and class II molecules, respectively. The MHC class specificity of T cells is stringent in many assays, but is less evident when cells are supplemented with exogenous lymphokines. The repertoire of T cells is shaped through contact with MHC molecules in the thymus and involves a complex process of positive selection and negative selection (tolerance). Tolerance of immature T cells to MHC molecules can reflect either clonal deletion or anergy and results from intrathymic contact with several cell types, including epithelial cells and cells with antigen-presenting function. Unlike immature T cells, mature T cells are relatively resistant to tolerance induction. In certain situations partial unresponsiveness of mature T cells can be achieved by exposing T cells to foreign MHC molecules expressed on atypical antigen-presenting cells. Tolerance is rarely complete, however, and the precise requirements for tolerizing mature T cells are still unclear.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sprent, J -- Gao, E K -- Webb, S R -- AI21487/AI/NIAID NIH HHS/ -- CA25803/CA/NCI NIH HHS/ -- CA38355/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1990 Jun 15;248(4961):1357-63.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Immunology, Research Institute of Scripps Clinic, La Jolla, CA 92037.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1694041" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigen-Presenting Cells/immunology ; Bone Marrow/immunology ; CD4-Positive T-Lymphocytes/immunology ; Clone Cells/immunology ; Epitopes/immunology ; Histocompatibility Antigens/*immunology ; Histocompatibility Antigens Class II/immunology ; *Immune Tolerance ; *Immunity ; Interleukin-2/physiology ; Mice ; Mice, Transgenic ; Receptors, Antigen, T-Cell/immunology ; T-Lymphocytes/*immunology ; T-Lymphocytes, Regulatory/immunology ; Thymus Gland/immunology
    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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    Posttranslational glutamylation of alpha-tubulin (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-01-05
    Description: The high degree of tubulin heterogeneity in neurons is controlled mainly at the posttranslational level. Several variants of alpha-tubulin can be posttranslationally labeled after incubation of cells with [3H]acetate or [3H]glutamate. Peptides carrying the radioactive moiety were purified by high-performance liquid chromatography. Amino acid analysis, Edman degradation sequencing, and mass spectrometric analysis of these peptides led to the characterization of a posttranslational modification consisting of the successive addition of glutamyl units on the gamma-carboxyl group of a glutamate residue (Glu445). This modification, localized within a region of alpha-tubulin that is important in the interactions of tubulin with microtubule-associated proteins and calcium, could play a role in regulating microtubule dynamics.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Edde, B -- Rossier, J -- Le Caer, J P -- Desbruyeres, E -- Gros, F -- Denoulet, P -- New York, N.Y. -- Science. 1990 Jan 5;247(4938):83-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratoire de Biochimie Cellulaire, College de France, Paris.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1967194" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acids/analysis ; Animals ; Brain/*metabolism ; Chromatography, High Pressure Liquid ; Glutamates/*metabolism ; Glutamic Acid ; Mass Spectrometry ; Mice ; Neurons/*metabolism ; Peptide Fragments/analysis ; *Protein Processing, Post-Translational ; Tubulin/*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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  • 5
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    Clonal deletion versus clonal anergy: the role of the thymus in inducing self tolerance (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-06-15
    Description: During development in the thymus, T cells are rendered tolerant to self antigens. It is now apparent that thymocytes bearing self-reactive T cell receptors can be tolerized by processes that result in physical elimination (clonal deletion) or functional inactivation (clonal anergy). As these mechanisms have important clinical implications for transplantation and autoimmunity, current investigations are focused on understanding the cellular and molecular interactions that generate these forms of tolerance.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ramsdell, F -- Fowlkes, B J -- New York, N.Y. -- Science. 1990 Jun 15;248(4961):1342-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Cellular and Molecular Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1972593" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, Surface/immunology ; Autoantigens/immunology ; Autoimmunity/immunology ; Bone Marrow/immunology ; CD4-Positive T-Lymphocytes/immunology ; Chickens ; Chimera ; Clone Cells/*immunology ; H-2 Antigens/immunology ; Histocompatibility Antigens/immunology ; Histocompatibility Antigens Class II/immunology ; *Immune Tolerance ; Mice ; Mice, Transgenic ; Minor Lymphocyte Stimulatory Antigens ; Receptors, Antigen, T-Cell/*immunology ; T-Lymphocytes/*immunology ; T-Lymphocytes, Regulatory/immunology ; Thymus Gland/*immunology ; Xenopus
    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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    The dominant W42 spotting phenotype results from a missense mutation in the c-kit receptor kinase (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-01-12
    Description: The murine white spotting locus (W) is allelic with the proto-oncogene c-kit, which encodes a transmembrane tyrosine protein kinase receptor for an unknown ligand. Mutations at the W locus affect various aspects of hematopoiesis and the proliferation and migration of primordial germ cells and melanoblasts during development to varying degrees of severity. The W42 mutation has a particularly severe effect in both the homozygous and the heterozygous states. The molecular basis of the W42 mutation was determined. The c-kit protein products in homozygous mutant mast cells were expressed normally but displayed a defective tyrosine kinase activity in vitro. Nucleotide sequence analysis of mutant complementary DNAs revealed a missense mutation that replaces aspartic acid with asparagine at position 790 in the c-kit protein product. Aspartic acid-790 is a conserved residue in all protein kinases. These results provide an explanation for the dominant nature of the W42 mutation and provide insight into the mechanism of c-kit-mediated signal transduction.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tan, J C -- Nocka, K -- Ray, P -- Traktman, P -- Besmer, P -- P01-CA-16599/CA/NCI NIH HHS/ -- R01-CA-32926/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1990 Jan 12;247(4939):209-12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Molecular Biology Program, Sloan Kettering Institute, New York, NY 10021.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1688471" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; Cells, Cultured ; DNA/genetics ; Gene Expression ; Homozygote ; Liver/analysis/cytology/embryology ; Mast Cells/metabolism ; Mice ; Molecular Sequence Data ; *Mutation ; *Phenotype ; Polymerase Chain Reaction ; Protein-Tyrosine Kinases/*genetics ; Proto-Oncogene Proteins/*genetics ; Proto-Oncogene Proteins c-kit ; RNA/analysis ; Receptors, Cell Surface/genetics ; Signal Transduction
    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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    Use of prior vaccinations for the development of new vaccines (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-07-27
    Description: There is currently a need for vaccine development to improve the immunogenicity of protective epitopes, which themselves are often poorly immunogenic. Although the immunogenicity of these epitopes can be enhanced by linking them to highly immunogenic carriers, such carriers derived from current vaccines have not proven to be generally effective. One reason may be related to epitope-specific suppression, in which prior vaccination with a protein can inhibit the antibody response to new epitopes linked to the protein. To circumvent such inhibition, a peptide from tetanus toxoid was identified that, when linked to a B cell epitope and injected into tetanus toxoid-primed recipients, retained sequences for carrier but not suppressor function. The antibody response to the B cell epitope was enhanced. This may be a general method for taking advantage of previous vaccinations in the development of new vaccines.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Etlinger, H M -- Gillessen, D -- Lahm, H W -- Matile, H -- Schonfeld, H J -- Trzeciak, A -- New York, N.Y. -- Science. 1990 Jul 27;249(4967):423-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Central Research Unit F. Hoffmann-La Roche, Basel, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1696030" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antigens, Protozoan/*immunology ; B-Lymphocytes/immunology ; Epitopes/*immunology ; Humans ; Mice ; Mice, Inbred BALB C ; Molecular Sequence Data ; Peptide Fragments/immunology ; Plasmodium falciparum/*immunology ; T-Lymphocytes/immunology ; T-Lymphocytes, Helper-Inducer/immunology ; T-Lymphocytes, Regulatory/immunology ; Tetanus Toxoid/*immunology ; *Vaccination ; Vaccines/*immunology
    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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    Acceleration of diabetes in young NOD mice with a CD4+ islet-specific T cell clone (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-09-21
    Description: Nonobese diabetic (NOD) mice develop an autoimmune form of diabetes, becoming hyperglycemic after 3 months of age. This process was accelerated by injecting young NOD mice with CD4+ islet-specific T cell clones derived from NOD mice. Overt diabetes developed in 10 of 19 experimental animals by 7 weeks of age, with the remaining mice showing marked signs of the disease in progress. Control mice did not become diabetic and had no significant pancreatic infiltration. This work demonstrates that a CD4 T cell clone is sufficient to initiate the disease process in the diabetes-prone NOD mouse.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Haskins, K -- McDuffie, M -- P01 DK40144/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 1990 Sep 21;249(4975):1433-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Barbara Davis Center for Childhood Diabetes, University of Colorado Health Sciences Center, Denver 80262.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2205920" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD4/analysis/*immunology ; Clone Cells ; Diabetes Mellitus, Experimental/*immunology/pathology ; Female ; Islets of Langerhans/*immunology/pathology ; Male ; Mice ; Mice, Inbred Strains ; Mice, Mutant Strains ; T-Lymphocytes/*immunology/transplantation
    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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    Dominant negative regulation of the mouse alpha-fetoprotein gene in adult liver (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-12-21
    Description: Transcription of the mouse alpha-fetoprotein gene is activated in the developing fetal liver and gut and repressed in both tissues shortly after birth. With germline transformation in mice, a cis-acting element was identified upstream of the transcription initiation site of the alpha-fetoprotein gene that was responsible for repression of the gene in adult liver. This negative element acts as a repressor in a position-dependent manner.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vacher, J -- Tilghman, S M -- CA44976/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1990 Dec 21;250(4988):1732-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Biology, Princeton University, NJ 08544.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1702902" target="_blank"〉PubMed〈/a〉
    Keywords: Aging ; Animals ; Animals, Newborn ; Chromosome Deletion ; Cloning, Molecular ; DNA-Binding Proteins/metabolism ; Enhancer Elements, Genetic ; Fetus ; *Gene Expression Regulation ; Hepatocyte Nuclear Factor 1 ; Hepatocyte Nuclear Factor 1-alpha ; Hepatocyte Nuclear Factor 1-beta ; Liver/growth & development/*metabolism ; Mice ; *Nuclear Proteins ; Transcription Factors/metabolism ; Transcription, Genetic ; alpha-Fetoproteins/*genetics
    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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    "Superantigens" may shed light on immune puzzle (1990)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1990-05-11
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hoffman, M -- New York, N.Y. -- Science. 1990 May 11;248(4956):685-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2333520" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, Bacterial/*immunology ; Antigens, Viral/immunology ; Bacterial Toxins/*immunology ; Humans ; Immune System/*physiology ; Lymphocytes/*immunology ; Mice ; T-Lymphocytes/immunology
    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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