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  • Articles  (84)
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  • Articles  (84)
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  • American Association for the Advancement of Science (AAAS)  (84)
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  • 1
    Publication Date: 1987-01-02
    Description: The alpha-chain of the nicotinic acetylcholine receptor carries the binding sites both for cholinergic ligands and for most experimentally induced or naturally occurring antibodies to the native receptor. By means of expression cloning in Escherichia coli, fusion proteins were derived from specific fragments of a complementary DNA encoding the mouse alpha-chain, allowing the mapping of the toxin-binding site to residues 160-216 and the main immunogenic region to residues 6-85. This approach permits the independent study of different functional domains of a complex receptor molecule and should be generally applicable to other proteins for which complementary DNA clones are available.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Barkas, T -- Mauron, A -- Roth, B -- Alliod, C -- Tzartos, S J -- Ballivet, M -- New York, N.Y. -- Science. 1987 Jan 2;235(4784):77-80.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2432658" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Antibodies, Monoclonal/immunology ; Binding Sites ; Binding, Competitive ; Bungarotoxins/metabolism ; Cloning, Molecular ; Epitopes ; Humans ; Immunosorbent Techniques ; Ligands ; Mice ; Receptors, Nicotinic/genetics/*immunology ; Recombinant Fusion Proteins/immunology ; Species Specificity ; Structure-Activity Relationship
    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
    Publication Date: 1987-09-18
    Description: Expression of c-myb proto-oncogene messenger RNA (mRNA) and protein has been detected principally in tumors and in normal tissue of hematopoietic origin. In each hematopoietic lineage examined, expression of the c-myb gene is markedly downregulated during hematopoietic maturation. However, the mechanism by which differential expression of the c-myb gene is regulated is not known. In murine B-lymphoid tumor cell lines, the amount of steady-state c-myb mRNA is 10 to more than 100 times greater in pre-B cell lymphomas than in B cell lymphomas and plasmacytomas. The downregulation of c-myb mRNA correlates with events at the pre-B cell-B cell junction. Differential expression of c-myb mRNA levels detected between a pre-B cell lymphoma and a mature B cell lymphoma is now shown to be mediated by a block to transcription elongation in the first intron of the c-myb locus. In addition, this developmentally regulated difference in transcriptional activity is correlated with alterations in higher order chromatin structure as reflected by changes in the patterns of hypersensitivity to deoxyribonuclease I at the 5' end of the c-myb transcription unit. Regulation of transcription elongation may provide a more sensitive mechanism for rapidly increasing and decreasing mRNA levels in response to external stimuli than regulation of the initiation of transcription.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bender, T P -- Thompson, C B -- Kuehl, W M -- New York, N.Y. -- Science. 1987 Sep 18;237(4821):1473-6.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3498214" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; B-Lymphocytes ; Chromosome Mapping ; *Gene Expression Regulation ; Introns ; Lymphoma/*genetics ; Mice ; Nucleic Acid Hybridization ; *Peptide Chain Elongation, Translational ; *Proto-Oncogenes ; RNA, Messenger/*metabolism ; *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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  • 3
    Publication Date: 1987-08-28
    Description: Li-Fraumeni syndrome is manifested in a variety of neoplasms that are transmitted in a dominantly inherited pattern. The noncancerous skin fibroblasts of family members exhibit a unique characteristic of being resistant to the killing effect of ionizing radiation. A three- to eightfold elevation in expression of c-myc and an apparent activation of c-raf-1 gene have been observed in these noncancerous skin fibroblasts. These results may provide insight into the heritable defect underlying the familial predisposition to a variety of cancers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chang, E H -- Pirollo, K F -- Zou, Z Q -- Cheung, H Y -- Lawler, E L -- Garner, R -- White, E -- Bernstein, W B -- Fraumeni, J W Jr -- Blattner, W A -- CA45158/CA/NCI NIH HHS/ -- CO7488/CO/NCI NIH HHS/ -- New York, N.Y. -- Science. 1987 Aug 28;237(4818):1036-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3616624" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Transformation, Neoplastic/radiation effects ; Cells, Cultured ; Fibroblasts/*radiation effects ; Humans ; Mice ; Mice, Nude ; Neoplastic Syndromes, Hereditary/*genetics ; Oncogenes/*radiation effects ; Pedigree ; *Radiation Tolerance ; Skin/cytology/*radiation effects ; Syndrome
    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
    Publication Date: 1987-07-10
    Description: A wide variety of human tumors contain an amplified or overexpressed erbB-2 gene, which encodes a growth factor receptor-like protein. When erbB-2 complementary DNA was expressed in NIH/3T3 cells under the control of the SV40 promoter, the gene lacked transforming activity despite expression of detectable levels of the erbB-2 protein. A further five- to tenfold increase in its expression under influence of the long terminal repeat of Moloney murine leukemia virus was associated with activation of erbB-2 as a potent oncogene. The high levels of the erbB-2 product associated with malignant transformation of NIH/3T3 cells were observed in human mammary tumor cells that overexpressed this gene. These findings demonstrate a new mechanism for acquisition of oncogenic properties by genes encoding growth factor receptor-like proteins and provide a functional basis for the role of their overexpression in the development of human malignancies.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Di Fiore, P P -- Pierce, J H -- Kraus, M H -- Segatto, O -- King, C R -- Aaronson, S A -- New York, N.Y. -- Science. 1987 Jul 10;237(4811):178-82.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2885917" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Breast Neoplasms/genetics ; Cell Line ; *Cell Transformation, Neoplastic/genetics ; DNA/genetics ; Fibroblasts/*metabolism ; Gene Expression Regulation ; Genes, Viral ; Humans ; Mice ; Moloney murine leukemia virus/genetics ; Promoter Regions, Genetic ; Proto-Oncogene Proteins/biosynthesis/genetics/*physiology ; Rats ; Receptor, Epidermal Growth Factor ; Receptor, ErbB-2 ; Receptors, Cell Surface/genetics ; Recombinant Fusion Proteins/biosynthesis/genetics/physiology ; Simian virus 40/genetics ; Tumor Stem Cell Assay
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    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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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1987-12-04
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Dunn, A J -- Powell, M L -- Gaskin, J M -- MH25486/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1987 Dec 4;238(4832):1423-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neuroscience, College of Medicine, University of Florida, Gainesville 32610.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3685987" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Corticosterone/*blood ; Female ; Hypophysectomy ; Lymphocytes/physiology ; Male ; Mice ; Mice, Inbred Strains ; Models, Biological ; Newcastle Disease/*blood ; Pituitary-Adrenal System/*physiopathology ; Postoperative Complications/blood ; Stress, Physiological/blood
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 6
    Publication Date: 1987-10-09
    Description: Oncogenes encoding serine/threonine or tyrosine kinases were introduced into the established rodent fibroblast cell line NIH 3T3 and tested for tumorigenic and metastatic behavior in T cell-deficient nude mice. Transforming oncogenes of the ras family were capable of converting fibroblast cell lines to fully metastatic tumors. Cell lines transformed by the kinase oncogenes mos, raf, src, fes, and fms formed experimental metastases and (in some cases) these genes were more efficient at metastatic conversion than a mutant ras gene. In contrast, cells transformed by either of two nuclear oncogenes, myc or p53, were tumorigenic when injected subcutaneously but were virtually nonmetastatic after intravenous injection. These data demonstrate that, in addition to ras, a structurally divergent group of kinase oncogenes can induce the metastatic phenotype.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Egan, S E -- Wright, J A -- Jarolim, L -- Yanagihara, K -- Bassin, R H -- Greenberg, A H -- New York, N.Y. -- Science. 1987 Oct 9;238(4824):202-5.〈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/3659911" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Cell Transformation, Neoplastic ; Cells, Cultured ; *Genes ; Mice ; *Neoplasm Metastasis ; *Oncogenes ; Phenotype ; Protein Kinases/*genetics
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  • 7
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1987-07-31
    Description: A defined medium (H-1) was developed for cultivation of the suckling mouse cataract agent, Spiroplasma mirum, a fastidious member of the class Mollicutes that causes cataracts and chronic brain infection in inoculated neonate mice. The H-1 medium was used to show the importance of sphingomyelin as a growth factor for the culture of the spiroplasma in vitro. The growth of Spiroplasma mirum and the pathology it induces in sphingomyelin-rich tissues in vivo may be related to this dependency.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hackett, K J -- Ginsberg, A S -- Rottem, S -- Henegar, R B -- Whitcomb, R F -- New York, N.Y. -- Science. 1987 Jul 31;237(4814):525-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3603039" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cataract/microbiology ; *Culture Media ; Mice ; Spiroplasma/classification/*growth & development
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  • 8
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1987-04-03
    Description: A human B cell subpopulation identifiable by the expression of the cell surface antigen Leu-1 (CD5) is responsible for most of the immunoglobulin M rheumatoid factor secreted in vitro after the cells are stimulated with Staphylococcus aureus. The ability of B cells bearing the Leu-1 marker (Leu-1+) to secrete rheumatoid factor is present early in development and extends to adulthood, since Leu-1+ B cells from cord blood and from peripheral blood lymphocytes of both normal adults and patients with certain autoimmune conditions secrete rheumatoid factor in comparable amounts. The neonatal enrichment of Leu-1+ B cells, the presence of Leu-1+ B cells in increased frequencies in patients with autoimmune disease, and the involvement of Leu-1+ B cells in autoantibody secretion suggest both developmental and functional homologies between this human B cell subpopulation and the murine Ly-1 B cell subpopulation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hardy, R R -- Hayakawa, K -- Shimizu, M -- Yamasaki, K -- Kishimoto, T -- New York, N.Y. -- Science. 1987 Apr 3;236(4797):81-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3105057" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, Differentiation, B-Lymphocyte ; Antigens, Differentiation, T-Lymphocyte ; Antigens, Surface/*immunology ; Autoimmune Diseases/*immunology ; B-Lymphocytes/*classification/immunology ; Cell Separation ; Fetal Blood/cytology ; Flow Cytometry ; Humans ; Immunoglobulin M/secretion ; Leukocyte Count ; Mice ; Rheumatoid Factor/*secretion
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  • 9
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 1987-07-03
    Description: The cerebellar cortex is perhaps the best characterized structure in the mammalian central nervous system. Although the major cerebellar cell classes are well known, a new class of cerebellar cortical neuron has now been identified with a monoclonal antibody (Mab) generated by a procedure for rapid immunization and selective immunosuppression of antibody responses. This procedure generates a high frequency of immunoglobulin G-class antibodies of desired specificity, and has allowed the generation of two antibodies that recognize subsets of cerebellar cortical neurons. One of these antibodies defines a previously unrecognized class of cerebellar neuron. The distribution and antigenic characteristics of this neuron suggest that it has a distinct role in cerebellar circuitry.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hockfield, S -- R01 EY06511/EY/NEI NIH HHS/ -- New York, N.Y. -- Science. 1987 Jul 3;237(4810):67-70.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3603010" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Newborn/immunology ; Antibodies, Monoclonal/*immunology ; Cerebellar Cortex/cytology/*immunology ; Immune Tolerance ; Mice ; Mice, Inbred BALB C/immunology ; Rats
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  • 10
    Publication Date: 1987-10-16
    Description: A portion of the Duchenne muscular dystrophy (DMD) gene transcript from human fetal skeletal muscle and mouse adult heart was sequenced, representing approximately 25 percent of the total, 14-kb DMD transcript. The nucleic acid and predicted amino acid sequences from the two species are nearly 90 percent homologous. The amino acid sequence that is predicted from this portion of the DMD gene indicates that the protein product might serve a structural role in muscle, but the abundance and tissue distribution of the messenger RNA suggests that the DMD protein is not nebulin.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hoffman, E P -- Monaco, A P -- Feener, C C -- Kunkel, L M -- 2T 32 GM07753-07/GM/NIGMS NIH HHS/ -- HD18658/HD/NICHD NIH HHS/ -- R01 NS23740/NS/NINDS NIH HHS/ -- T32 GM007753/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1987 Oct 16;238(4825):347-50.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Genetics, Children's Hospital, Boston, MA 02115.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3659917" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Base Sequence ; DNA/*genetics ; DNA, Recombinant ; Exons ; Humans ; Male ; Mice ; Molecular Sequence Data ; Muscle Proteins/genetics ; Muscles/analysis/embryology ; Muscular Dystrophies/*genetics ; Muscular Dystrophy, Animal/*genetics ; Myocardium/analysis ; Nucleic Acid Hybridization ; RNA, Messenger/genetics ; X Chromosome
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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