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  • Artikel  (227)
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  • 1
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    High probability opening of NMDA receptor channels by L-glutamate (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1992-01-24
    Beschreibung: Synaptic plasticity can be triggered by calcium flux into neurons through synaptically activated N-methyl-D-aspartate (NMDA) receptor channels. The amplitude and time course of the resulting intracellular calcium transient depend on the number of open NMDA receptor channels and the kinetics of their activation. Short applications of L-glutamate to outside-out patches from hippocampal neurons in the presence and absence of MK-801 revealed that about 30 percent of L-glutamate-bound channels are open at the peak of the current. This high probability of opening suggests that very few channels are required to guarantee a large, localized postsynaptic calcium transient.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Jahr, C E -- NS21419/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1992 Jan 24;255(5043):470-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Vollum Institute L474, Oregon Health Sciences University, Portland 97201.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1346477" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Animals, Newborn ; Cells, Cultured ; Dizocilpine Maleate/pharmacology ; Glutamates/*physiology ; Glutamic Acid ; Hippocampus/physiology ; In Vitro Techniques ; *Ion Channel Gating ; Rats ; Receptors, N-Methyl-D-Aspartate/*physiology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 2
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    Syntaxin: a synaptic protein implicated in docking of synaptic vesicles at presynaptic active zones (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1992-07-10
    Beschreibung: Synaptic vesicles store neurotransmitters that are released during calcium-regulated exocytosis. The specificity of neurotransmitter release requires the localization of both synaptic vesicles and calcium channels to the presynaptic active zone. Two 35-kilodalton proteins (p35 or syntaxins) were identified that interact with the synaptic vesicle protein p65 (synaptotagmin). The p35 proteins are expressed only in the nervous system, are 84 percent identical, include carboxyl-terminal membrane anchors, and are concentrated on the plasma membrane at synaptic sites. An antibody to p35 immunoprecipitated solubilized N-type calcium channels. The p35 proteins may function in docking synaptic vesicles near calcium channels at presynaptic active zones.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bennett, M K -- Calakos, N -- Scheller, R H -- 2T32G07365/PHS HHS/ -- New York, N.Y. -- Science. 1992 Jul 10;257(5067):255-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Molecular and Cellular Physiology, Stanford University Medical Center, CA 94305.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1321498" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Amino Acid Sequence ; Animals ; *Antigens, Surface ; *Calcium-Binding Proteins ; Electrophoresis, Polyacrylamide Gel ; Immunoblotting ; Membrane Glycoproteins/physiology ; Molecular Sequence Data ; Nerve Tissue Proteins/isolation & purification/*physiology ; Oligonucleotide Probes ; Rats ; Sequence Homology, Nucleic Acid ; Synaptic Transmission/physiology ; Synaptic Vesicles/*physiology ; Synaptotagmin I ; Synaptotagmins ; Syntaxin 1
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 3
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    Requirement for the adenovirus type 9 E4 region in production of mammary tumors (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1992-09-07
    Beschreibung: Oncogenic viruses demonstrating a strict tropism for the mammary gland provide special opportunities to study the susceptibility of this tissue to neoplasia. In rats, human adenovirus type 9 (Ad9) elicits mammary fibroadenomas that are similar to common breast tumors in women, as well as phyllodes-like tumors and mammary sarcomas. By constructing recombinant adenoviruses between Ad9 and Ad26 (a related nontumorigenic virus), it was shown that the Ad9 E4 region was absolutely required to produce these mammary tumors. This indicates that an adenovirus gene located outside the classic transforming region (E1) can significantly influence the in vivo oncogenicity of an adenovirus. Consistent with a direct role in mammary gland oncogenesis, the Ad9 E4 region also exhibited transforming properties in vitro. Therefore, the Ad9 E4 region is a viral oncogene specifically involved in mammary gland tumorigenesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Javier, R -- Raska, K Jr -- Shenk, T -- CA 21196/CA/NCI NIH HHS/ -- CA 41086/CA/NCI NIH HHS/ -- T32 CA09528/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1992 Aug 28;257(5074):1267-71.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Molecular Biology, Princeton University, NJ 08544.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1519063" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Adenoviridae/genetics/*pathogenicity ; Amino Acid Sequence ; Animals ; Cell Transformation, Neoplastic/*genetics ; Chromosome Mapping ; Female ; Mammary Neoplasms, Experimental/*genetics/*microbiology ; Molecular Sequence Data ; Open Reading Frames/genetics ; Rats ; Rats, Inbred WF ; Sequence Homology, Nucleic Acid
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 4
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    Exaggerated carcinogenicity of chemicals (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1992-06-19
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Abelson, P H -- New York, N.Y. -- Science. 1992 Jun 19;256(5064):1609.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1609271" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Butadienes/*toxicity ; *Carcinogenicity Tests ; Haplorhini ; Humans ; Mice ; Neoplasms/*chemically induced ; Rats ; Risk
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 5
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    Repression of the insulin-like growth factor II gene by the Wilms tumor suppressor WT1 (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1992-07-31
    Beschreibung: The Wilms tumor suppressor gene wt1 encodes a zinc finger DNA binding protein, WT1, that functions as a transcriptional repressor. The fetal mitogen insulin-like growth factor II (IGF-II) is overexpressed in Wilms tumors and may have autocrine effects in tumor progression. The major fetal IGF-II promoter was defined in transient transfection assays as a region spanning from nucleotides -295 to +135, relative to the transcription start site. WT1 bound to multiple sites in this region and functioned as a potent repressor of IGF-II transcription in vivo. Maximal repression was dependent on the presence of WT1 binding sites on each side of the transcriptional initiation site. These findings provide a molecular basis for overexpression of IGF-II in Wilms tumors and suggest that WT1 negatively regulates blastemal cell proliferation by limiting the production of a fetal growth factor in the developing vertebrate kidney.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Drummond, I A -- Madden, S L -- Rohwer-Nutter, P -- Bell, G I -- Sukhatme, V P -- Rauscher, F J 3rd -- CA 10817/CA/NCI NIH HHS/ -- CA 47983/CA/NCI NIH HHS/ -- CA 52009/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1992 Jul 31;257(5070):674-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, University of Chicago, IL 60637.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1323141" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Base Sequence ; Binding Sites ; Blotting, Northern ; DNA/chemistry/metabolism ; DNA-Binding Proteins/*metabolism ; Deoxyribonuclease I/metabolism ; *Gene Expression Regulation, Neoplastic ; Genes, Wilms Tumor/*physiology ; Humans ; Insulin-Like Growth Factor II/*genetics ; Kidney/embryology/metabolism ; Mice ; Molecular Sequence Data ; Promoter Regions, Genetic ; Rats ; Sequence Homology, Nucleic Acid ; Transfection ; WT1 Proteins ; Wilms Tumor/genetics/metabolism ; Zinc Fingers
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 6
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    Cholecystokinin antianalgesia: safety cues abolish morphine analgesia (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1992-05-08
    Beschreibung: Environmental stimuli that signal the occurrence of aversive or dangerous events activate endogenous opiate analgesia systems. Signals for safety (the nonoccurrence of aversive events) produce the opposite and inhibit environmentally produced analgesia. Stimuli that signal safety are now shown to abolish the analgesic effect of morphine, even when morphine is applied directly to spinal cord. Further, this antiopiate effect occurs because the environmental stimulus leads to release of the neuropeptide cholecystokinin in the spinal cord. This process may contribute to the regulation of pain and the development of opiate tolerance.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wiertelak, E P -- Maier, S F -- Watkins, L R -- 5T32MH14617-15/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 1992 May 8;256(5058):830-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Psychology, University of Colorado, Boulder 80309.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1589765" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): *Analgesia ; Animals ; Benzodiazepinones/pharmacology ; Cholecystokinin/*pharmacology ; Injections, Spinal ; Morphine/administration & dosage/antagonists & inhibitors/*pharmacology ; Pain/physiopathology ; *Phenylurea Compounds ; Rats ; Receptors, Cholecystokinin/antagonists & inhibitors/*physiology ; Safety ; Spinal Cord/drug effects/*physiology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 7
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    Chondroitin sulfate as a regulator of neuronal patterning in the retina (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1992-02-07
    Beschreibung: Highly sulfated proteoglycans are correlated with axon boundaries in the developing central nervous system which suggests that these molecules affect neural pattern formation. In the developing mammalian retina, gradual regression of chondroitin sulfate may help control the onset of ganglion cell differentiation and initial direction of their axons. Changes induced by the removal of chondroitin sulfate from intact retinas in culture confirm the function of chondroitin sulfate in retinal histogenesis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brittis, P A -- Canning, D R -- Silver, J -- New York, N.Y. -- Science. 1992 Feb 7;255(5045):733-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurosciences, Case Western Reserve University, Cleveland, OH 44106.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1738848" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Axons/physiology ; Cell Differentiation/drug effects ; Cells, Cultured ; Chondroitin Lyases/pharmacology ; Chondroitin Sulfate Proteoglycans/pharmacology ; Chondroitin Sulfates/analysis/*physiology ; Immunohistochemistry ; Rats ; Retina/chemistry/cytology/*embryology ; Retinal Ganglion Cells/chemistry/*cytology ; Tubulin/analysis
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 8
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    Activity-dependent decrease in NMDA receptor responses during development of the visual cortex (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1992-11-06
    Beschreibung: Plasticity of the developing visual system has been regarded as the best model for changes of neuronal connections under the influence of the environment. N-methyl-D-aspartate (NMDA) receptors are crucial for experience-dependent synaptic modifications that occur in the developing visual cortex. NMDA-mediated excitatory postsynaptic currents (EPSCs) in layer IV neurons of the visual cortex lasted longer in young rats than in adult rats, and the duration of the EPSCs became progressively shorter, in parallel with the developmental reduction in synaptic plasticity. This decrease in NMDA receptor-mediated EPSC duration is delayed when the animals are reared in the dark, a condition that prolongs developmental plasticity, and is prevented by treatment with tetrodotoxin, a procedure that inhibits neural activity. Application of L-glutamate to outside-out patches excised from layer IV neurons of young, but not of adult, rats activated prolonged bursts of NMDA channel openings. A modification of the NMDA receptor gating properties may therefore account for the age-dependent decline of visual cortical plasticity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Carmignoto, G -- Vicini, S -- P01 NS 28130-01/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1992 Nov 6;258(5084):1007-11.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉FIDIA Georgetown Institute for the Neurosciences, Georgetown University School of Medicine, Washington, DC 20007.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1279803" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Action Potentials ; Aging/physiology ; Animals ; Electric Conductivity ; Glutamates/pharmacology ; Glutamic Acid ; Ion Channel Gating/physiology ; Ion Channels/physiology ; Neuronal Plasticity/physiology ; Neurons/drug effects/physiology ; Rats ; Receptors, N-Methyl-D-Aspartate/*physiology ; Synapses/physiology ; Tetrodotoxin/pharmacology ; Visual Cortex/*growth & development/physiology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 9
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    Interleukin-8 as a macrophage-derived mediator of angiogenesis (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1992-12-11
    Beschreibung: Angiogenic factors produced by monocytes-macrophages are involved in the pathogenesis of chronic inflammatory disorders characterized by persistent angiogenesis. The possibility was tested that interleukin-8 (IL-8), which is a cytokine that is chemotactic for lymphocytes and neutrophils, is also angiogenic. Human recombinant IL-8 was potently angiogenic when implanted in the rat cornea and induced proliferation and chemotaxis of human umbilical vein endothelial cells. Angiogenic activity present in the conditioned media of inflamed human rheumatoid synovial tissue macrophages or lipopolysaccharide-stimulated blood monocytes was equally blocked by antibodies to either IL-8 or tumor necrosis factor-alpha. An IL-8 antisense oligonucleotide specifically blocked the production of monocyte-induced angiogenic activity. These data suggest a function for macrophage-derived IL-8 in angiogenesis-dependent disorders such as rheumatoid arthritis, tumor growth, and wound repair.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Koch, A E -- Polverini, P J -- Kunkel, S L -- Harlow, L A -- DiPietro, L A -- Elner, V M -- Elner, S G -- Strieter, R M -- AR30692/AR/NIAMS NIH HHS/ -- AR41492/AR/NIAMS NIH HHS/ -- HL39926/HL/NHLBI NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1992 Dec 11;258(5089):1798-801.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Medicine, Northwestern University Medical School, Chicago, IL 60611.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1281554" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Arthritis, Rheumatoid/physiopathology ; Base Sequence ; Cell Division/drug effects ; Cells, Cultured ; Chemotaxis/*drug effects ; Cornea/*drug effects/physiology ; Dose-Response Relationship, Drug ; Endothelium, Vascular/drug effects/*physiology ; Fibroblast Growth Factor 2/pharmacology ; Humans ; Interleukin-8/genetics/*pharmacology ; Macrophages/*physiology ; Mice ; Molecular Sequence Data ; Monocytes/physiology ; *Neovascularization, Pathologic ; Oligonucleotides, Antisense/*pharmacology ; Rabbits ; Rats ; Recombinant Proteins/pharmacology ; Synovial Fluid/physiology ; Tumor Necrosis Factor-alpha/genetics ; Umbilical Veins
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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  • 10
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    Dendritic spines: convergence of theory and experiment (1992)
    American Association for the Advancement of Science (AAAS)
    Details
    Publikationsdatum: 1992-05-15
    Beschreibung: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Koch, C -- Zador, A -- Brown, T H -- New York, N.Y. -- Science. 1992 May 15;256(5059):973-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Computation and Neural Systems Program, California Institute of Technology, Pasadena 91125.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/1589781" target="_blank"〉PubMed〈/a〉
    Schlagwort(e): Animals ; Brain/physiology/ultrastructure ; Calcium/metabolism ; Dendrites/physiology/*ultrastructure ; Electrophysiology ; Hippocampus/*ultrastructure ; Microscopy, Electron ; Rats ; Synapses/physiology
    Print ISSN: 0036-8075
    Digitale ISSN: 1095-9203
    Thema: Biologie , Chemie und Pharmazie , Informatik , Medizin , Allgemeine Naturwissenschaft , Physik
    Publiziert von American Association for the Advancement of Science (AAAS)
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