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  • Articles  (112)
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  • Articles  (112)
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  • 1
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    Molecular cloning of odorant-binding protein: member of a ligand carrier family (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-07-15
    Description: Odorant-binding protein (OBP) is found in nasal epithelium, and it selectively binds odorants. Three complementary DNAs encoding rat odorant-binding protein have now been cloned and sequenced. One clone contains an open reading frame predicted to encode an 18,091-dalton protein. RNA blot analysis confirms the localization of OBP messenger RNA in the nasal epithelium. This OBP has 33 percent amino acid identity to alpha 2-microglobulin, a secreted plasma protein. Other members of an alpha 2-microglobulin superfamily bind and transport hydrophobic ligands. Thus, OBP probably binds and carries odorants within the nasal epithelium to putative olfactory receptors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pevsner, J -- Reed, R R -- Feinstein, P G -- Snyder, S H -- DA-00074/DA/NIDA NIH HHS/ -- GM-07626/GM/NIGMS NIH HHS/ -- P01 CA16519-13/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1988 Jul 15;241(4863):336-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neuroscience, Johns Hopkins University School of Medicine, Baltimore, MD 21205.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3388043" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Carrier Proteins/*genetics ; Cloning, Molecular ; Ligands ; Membrane Proteins/*genetics ; Molecular Sequence Data ; Nasal Mucosa/*physiology ; Rats ; *Receptors, Odorant ; Smell/*physiology
    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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  • 2
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    Heat shock is lethal to fibroblasts microinjected with antibodies against hsp70 (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-10-21
    Description: Synthesis of a small group of highly conserved proteins in response to elevated temperature and other agents that induce stress is a universal feature of prokaryotic and eukaryotic cells. Although correlative evidence suggests that these proteins play a role in enhancing survival during and after stress, there is no direct evidence to support this in mammalian cells. To assess the role of the most highly conserved heat shock protein (hsp) family during heat shock, affinity-purified monoclonal antibodies to hsp70 were introduced into fibroblasts by needle microinjection. In addition to impairing the heat-induced translocation of hsp70 proteins into the nucleus after mild heat shock treatment, injected cells were unable to survive a brief incubation at 45 degrees C. Cells injected with control antibodies survived a similar heat shock. These results indicate that functional hsp70 is required for survival of these cells during and after thermal stress.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Riabowol, K T -- Mizzen, L A -- Welch, W J -- GM33551/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1988 Oct 21;242(4877):433-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Cold Spring Harbor Laboratory, NY 11724.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3175665" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies/administration & dosage ; Antigen-Antibody Complex ; Cell Survival ; Fibroblasts/cytology ; Heat-Shock Proteins/immunology/*physiology ; *Hot Temperature ; Microinjections ; Rats
    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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    Grafting genetically modified cells to the damaged brain: restorative effects of NGF expression (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-12-16
    Description: Fibroblasts were genetically modified to secrete nerve growth factor (NGF) by infection with a retroviral vector and then implanted into the brains of rats that had surgical lesions of the fimbria-fornix. The grafted cells survived and produced sufficient NGF to prevent the degeneration of cholinergic neurons that would die without treatment. In addition, the protected cholinergic cells sprouted axons that projected in the direction of the cellular source of NGF. These results indicate that a combination of gene transfer and intracerebral grafting may provide an effective treatment for some disorders of the central nervous system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rosenberg, M B -- Friedmann, T -- Robertson, R C -- Tuszynski, M -- Wolff, J A -- Breakefield, X O -- Gage, F H -- AG06088/AG/NIA NIH HHS/ -- HD20034/HD/NICHD NIH HHS/ -- NS24279/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1988 Dec 16;242(4885):1575-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pediatrics, University of California School of Medicine, La Jolla 92093.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3201248" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylcholinesterase/metabolism ; Animals ; Brain/cytology/enzymology/*pathology ; Cell Survival ; DNA/genetics ; Fibroblasts/metabolism/*transplantation ; Genetic Vectors ; Histocytochemistry ; Moloney murine leukemia virus/genetics ; Nerve Growth Factors/genetics/*physiology ; Rats
    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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    Expression of c-fos protein in brain: metabolic mapping at the cellular level (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-06-03
    Description: The proto-oncogene c-fos is expressed in neurons in response to direct stimulation by growth factors and neurotransmitters. In order to determine whether the c-fos protein (Fos) and Fos-related proteins can be induced in response to polysynaptic activation, rat hindlimb motor/sensory cortex was stimulated electrically and Fos expression examined immunohistochemically. Three hours after the onset of stimulation, focal nuclear Fos staining was seen in motor and sensory thalamus, pontine nuclei, globus pallidus, and cerebellum. Moreover, 24-hour water deprivation resulted in Fos expression in paraventricular and supraoptic nuclei. Fos immunohistochemistry therefore provides a cellular method to label polysynaptically activated neurons and thereby map functional pathways.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sagar, S M -- Sharp, F R -- Curran, T -- EY05721/EY/NEI NIH HHS/ -- NS24666/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1988 Jun 3;240(4857):1328-31.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurology, University of California, San Francisco.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3131879" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain/*metabolism ; Cell Nucleus/metabolism ; Cerebellum/metabolism ; Cerebral Cortex/metabolism ; Electric Stimulation ; *Gene Expression Regulation ; Globus Pallidus/metabolism ; Hippocampus/metabolism ; Hypothalamus/metabolism ; Immunohistochemistry ; Motor Cortex/physiology ; Neurons/metabolism ; Pons/metabolism ; Proto-Oncogene Proteins/*genetics ; Proto-Oncogene Proteins c-fos ; Rats ; Thalamus/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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    Molecular crowding on the cell surface (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-01-01
    Description: Strong steric interactions among proteins on crowded living cell surfaces were revealed by measurements of the equilibrium spatial distributions of proteins in applied potential gradients. The fraction of accessible surface occupied by mobile surface proteins can be accurately represented by including steric exclusion in the statistical thermodynamic analysis of the data. The analyses revealed enhanced, concentration-dependent activity coefficients, implying unanticipated thermodynamic activity even at typical cell surface receptor concentrations.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ryan, T A -- Myers, J -- Holowka, D -- Baird, B -- Webb, W W -- AI18306/AI/NIAID NIH HHS/ -- AI22449/AI/NIAID NIH HHS/ -- GM33028/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 1988 Jan 1;239(4835):61-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physics, Cornell University, Ithaca, NY 14853.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2962287" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Membrane/*physiology ; *Membrane Fluidity ; Membrane Proteins/*physiology ; Rats ; Receptors, Fc/physiology ; Receptors, IgE ; Thermodynamics ; 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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  • 6
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    Mammalian glucocorticoid receptor derivatives enhance transcription in yeast (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-08-19
    Description: In mammalian cells, the glucocorticoid receptor binds specifically to glucocorticoid response element (GRE) DNA sequences and enhances transcription from linked promoters. It is shown here that derivatives of the glucocorticoid receptor also enhance transcription when expressed in yeast. Receptor-mediated enhancement in yeast was observed in fusions of GRE sequences to the yeast cytochrome c1 (CYC1) promoter; the CYC1 upstream activator sequences were not essential, since enhancement was observed in fusions of GREs to mutant CYC1 promoters retaining only the TATA region and transcription startpoints. It is concluded that the receptor operates by a common, highly conserved mechanism in yeast and mammalian cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Schena, M -- Yamamoto, K R -- CA20535-12/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 1988 Aug 19;241(4868):965-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Biophysics, University of California, San Francisco 94143.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3043665" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; DNA/metabolism ; *Enhancer Elements, Genetic ; Gene Expression Regulation ; Immunoassay ; Plasmids ; Promoter Regions, Genetic ; Rats ; Receptors, Glucocorticoid/*genetics ; Saccharomyces cerevisiae/*genetics ; *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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  • 7
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    Astrocytes synthesize angiotensinogen in brain (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-12-09
    Description: Cell types associated with angiotensinogen mRNA in rat brain were identified in individual brain sections by in situ hybridization with tritiated RNA probes or with a sulfur-35--labeled oligonucleotide combined with immunocytochemical detection of either glial fibrillary acidic protein (GFAP) for astrocytes or microtubule-associated protein (MAP-2) for neurons. Autoradiography revealed silver grains clustered primarily over GFAP-reactive soma and processes; most grain clusters were not associated with MAP-2--reactive cells. These results demonstrate that, in contrast to other known neuropeptide precursors, angiotensinogen is synthesized by glia.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stornetta, R L -- Hawelu-Johnson, C L -- Guyenet, P G -- Lynch, K R -- R01 HL33513/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 1988 Dec 9;242(4884):1444-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology, University of Virginia School of Medicine, Charlottesville 22908.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3201232" target="_blank"〉PubMed〈/a〉
    Keywords: Angiotensinogen/*biosynthesis/genetics ; Animals ; Astrocytes/*metabolism ; Brain/*metabolism ; Glial Fibrillary Acidic Protein/analysis ; Histocytochemistry ; Microtubule-Associated Proteins/analysis ; Nucleic Acid Hybridization ; RNA, Messenger/analysis/genetics ; Rats
    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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  • 8
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    Zinc-dependent structure of a single-finger domain of yeast ADR1 (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-09-16
    Description: In the proposed "zinc finger" DNA-binding motif, each repeat unit binds a zinc metal ion through invariant Cys and His residues and this drives the folding of each 30-residue unit into an independent nucleic acid-binding domain. To obtain structural information, we synthesized single and double zinc finger peptides from the yeast transcription activator ADR1, and assessed the metal-binding and DNA-binding properties of these peptides, as well as the solution structure of the metal-stabilized domains, with the use of a variety of spectroscopic techniques. A single zinc finger can exist as an independent structure sufficient for zinc-dependent DNA binding. An experimentally determined model of the single finger is proposed that is consistent with circular dichroism, one- and two-dimensional nuclear magnetic resonance, and visual spectroscopy of the single-finger peptide reconstituted in the presence of zinc.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Parraga, G -- Horvath, S J -- Eisen, A -- Taylor, W E -- Hood, L -- Young, E T -- Klevit, R E -- New York, N.Y. -- Science. 1988 Sep 16;241(4872):1489-92.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, University of Washington, Seattle 98195.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3047872" target="_blank"〉PubMed〈/a〉
    Keywords: Circular Dichroism ; DNA Mutational Analysis ; *DNA-Binding Proteins ; Magnetic Resonance Spectroscopy ; Metalloproteins ; Protein Conformation ; Saccharomyces cerevisiae ; Structure-Activity Relationship ; *Transcription Factors ; Zinc/*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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  • 9
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    Combinatorial cassette mutagenesis as a probe of the informational content of protein sequences (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-07-01
    Description: A method of combinatorial cassette mutagenesis was designed to readily determine the informational content of individual residues in protein sequences. The technique consists of simultaneously randomizing two or three positions by oligonucleotide cassette mutagenesis, selecting for functional protein, and then sequencing to determine the spectrum of allowable substitutions at each position. Repeated application of this method to the dimer interface of the DNA-binding domain of lambda repressor reveals that the number and type of substitutions allowed at each position are extremely variable. At some positions only one or two residues are functionally acceptable; at other positions a wide range of residues and residue types are tolerated. The number of substitutions allowed at each position roughly correlates with the solvent accessibility of the wild-type side chain.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Reidhaar-Olson, J F -- Sauer, R T -- AI-15706/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 1988 Jul 1;241(4861):53-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/3388019" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Binding Sites ; Codon ; DNA/genetics/metabolism ; *DNA-Binding Proteins ; Macromolecular Substances ; Molecular Sequence Data ; Mutation ; Plasmids ; Protein Conformation ; Repressor Proteins/*genetics ; Structure-Activity Relationship ; Transcription Factors/*genetics ; Viral Proteins ; Viral Regulatory and Accessory Proteins
    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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    Synaptic reorganization in the hippocampus induced by abnormal functional activity (1988)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1988-03-04
    Description: Abnormal functional activity induces long-lasting physiological alterations in neural pathways that may play a role in the development of epilepsy. The cellular mechanisms of these alterations are not well understood. One hypothesis is that abnormal activity causes structural reorganization of neural pathways and promotes epileptogenesis. This report provides morphological evidence that synchronous perforant path activation and kindling of limbic pathways induce axonal growth and synaptic reorganization in the hippocampus, in the absence of overt morphological damage. The results show a previously unrecognized anatomic plasticity associated with synchronous activity and development of epileptic seizures in neural pathways.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sutula, T -- He, X X -- Cavazos, J -- Scott, G -- K07-NS00808/NS/NINDS NIH HHS/ -- R29-NS25020/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1988 Mar 4;239(4844):1147-50.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurology, University of Wisconsin, Madison 53792.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2449733" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Axons/ultrastructure ; Cytoplasmic Granules/ultrastructure ; Electric Stimulation ; Electrophysiology ; Hippocampus/physiopathology/*ultrastructure ; Histocytochemistry ; Kindling, Neurologic ; Microscopy, Electron ; Neural Pathways/ultrastructure ; Neurons/ultrastructure ; Rats ; Seizures/*pathology/physiopathology ; Staining and Labeling ; Synapses/*ultrastructure
    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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