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  • Rats  (982)
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  • American Association for the Advancement of Science (AAAS)  (982)
  • American Geophysical Union (AGU)
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  • 1
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2002-09-14
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wilson, John H -- Elledge, Stephen J -- New York, N.Y. -- Science. 2002 Sep 13;297(5588):1822-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry and Molecular Biology, Baylor College of Medicine, Houston, TX 77030, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12228708" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; BRCA1 Protein/metabolism ; BRCA2 Protein/*chemistry/*metabolism ; Binding Sites ; Breast Neoplasms/genetics ; Crystallography, X-Ray ; DNA/*metabolism ; DNA Damage ; *DNA Repair ; DNA, Single-Stranded/metabolism ; DNA-Binding Proteins/metabolism ; Female ; Genes, BRCA1 ; Genes, BRCA2 ; Genetic Predisposition to Disease ; Humans ; Mice ; Ovarian Neoplasms/genetics ; Protein Folding ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Rad51 Recombinase ; Rats ; Recombination, Genetic ; Replication Protein A
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 2
    Publication Date: 2002-03-23
    Description: Activity-dependent modulation of synaptic efficacy in the brain contributes to neural circuit development and experience-dependent plasticity. Although glia are affected by activity and ensheathe synapses, their influence on synaptic strength has largely been ignored. Here, we show that a protein produced by glia, tumor necrosis factor alpha (TNFalpha), enhances synaptic efficacy by increasing surface expression of AMPA receptors. Preventing the actions of endogenous TNFalpha has the opposite effects. Thus, the continual presence of TNFalpha is required for preservation of synaptic strength at excitatory synapses. Through its effects on AMPA receptor trafficking, TNFalpha may play roles in synaptic plasticity and modulating responses to neural injury.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Beattie, Eric C -- Stellwagen, David -- Morishita, Wade -- Bresnahan, Jacqueline C -- Ha, Byeong Keun -- Von Zastrow, Mark -- Beattie, Michael S -- Malenka, Robert C -- DA00439/DA/NIDA NIH HHS/ -- MH063394/MH/NIMH NIH HHS/ -- NS 31193/NS/NINDS NIH HHS/ -- NS38079/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2002 Mar 22;295(5563):2282-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Nancy Pritzker Laboratory, Department of Psychiatry and Behavioral Sciences, Stanford University School of Medicine, Palo Alto, CA 94304, USA. beattie.2@osu.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11910117" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD/pharmacology ; Astrocytes/*metabolism ; Cells, Cultured ; Culture Media, Conditioned/pharmacology ; Gene Expression Regulation/drug effects ; Hippocampus/cytology/metabolism ; Neuronal Plasticity/drug effects ; Neurons/drug effects/metabolism ; Rats ; Rats, Sprague-Dawley ; Receptors, AMPA/metabolism ; Receptors, Tumor Necrosis Factor ; Receptors, Tumor Necrosis Factor, Type I ; Synapses/drug effects/*metabolism ; Synaptic Transmission/drug effects ; Tumor Necrosis Factor-alpha/antagonists & inhibitors/*metabolism
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  • 3
    Publication Date: 2003-06-28
    Description: In the mammalian CNS, N-methyl-D-aspartate (NMDA) receptors serve prominent roles in many physiological and pathophysiological processes including pain transmission. For full activation, NMDA receptors require the binding of glycine. It is not known whether the brain uses changes in extracellular glycine to modulate synaptic NMDA responses. Here, we show that synaptically released glycine facilitates NMDA receptor currents in the superficial dorsal horn, an area critically involved in pain processing. During high presynaptic activity, glycine released from inhibitory interneurons escapes the synaptic cleft and reaches nearby NMDA receptors by so-called spillover. In vivo, this process may contribute to the development of inflammatory hyperalgesia.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ahmadi, Seifollah -- Muth-Selbach, Uta -- Lauterbach, Andreas -- Lipfert, Peter -- Neuhuber, Winfried L -- Zeilhofer, Hanns Ulrich -- New York, N.Y. -- Science. 2003 Jun 27;300(5628):2094-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Institut fur Experimentelle und Klinische Pharmakologie und Toxikologie, Universitat Erlangen-Nurnberg, Fahrstrasse 17, D-91054 Erlangen, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12829784" target="_blank"〉PubMed〈/a〉
    Keywords: Analgesics/pharmacology ; Animals ; Anterior Horn Cells/drug effects/metabolism ; Diffusion ; Electric Stimulation ; Evoked Potentials/drug effects ; Excitatory Postsynaptic Potentials/drug effects ; Glycine/*metabolism/pharmacology ; In Vitro Techniques ; Interneurons/metabolism ; Neural Inhibition/drug effects ; Opioid Peptides/pharmacology ; Pain Measurement ; Patch-Clamp Techniques ; Posterior Horn Cells/drug effects/*metabolism ; Rats ; Rats, Sprague-Dawley ; Receptors, N-Methyl-D-Aspartate/*metabolism ; Serine/pharmacology ; Spinal Cord/drug effects/metabolism ; Synapses/*metabolism ; *Synaptic Transmission/drug effects ; Temperature
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  • 4
    Publication Date: 2003-11-01
    Description: Mutations in MeCP2, which encodes a protein that has been proposed to function as a global transcriptional repressor, are the cause of Rett syndrome (RT T), an X-linked progressive neurological disorder. Although the selective inactivation of MeCP2 in neurons is sufficient to confer a Rett-like phenotype in mice, the specific functions of MeCP2 in postmitotic neurons are not known. We find that MeCP2 binds selectively to BDNF promoter III and functions to repress expression of the BDNF gene. Membrane depolarization triggers the calcium-dependent phosphorylation and release of MeCP2 from BDNF promoter III, thereby facilitating transcription. These studies indicate that MeCP2 plays a key role in the control of neuronal activity-dependent gene regulation and suggest that the deregulation of this process may underlie the pathology of RT T.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, Wen G -- Chang, Qiang -- Lin, Yingxi -- Meissner, Alexander -- West, Anne E -- Griffith, Eric C -- Jaenisch, Rudolf -- Greenberg, Michael E -- HD 18655/HD/NICHD NIH HHS/ -- NS28829/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2003 Oct 31;302(5646):885-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Neuroscience, Children's Hospital, Harvard Medical School, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/14593183" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain-Derived Neurotrophic Factor/*genetics ; Calcium/*metabolism ; Cell Membrane/physiology ; Cells, Cultured ; *Chromosomal Proteins, Non-Histone ; Cloning, Molecular ; CpG Islands ; DNA Methylation ; DNA-Binding Proteins/*metabolism ; Electrophoretic Mobility Shift Assay ; *Gene Expression Regulation ; Gene Silencing ; Histones/metabolism ; Methyl-CpG-Binding Protein 2 ; Methylation ; Mice ; Mice, Knockout ; Neurons/metabolism/physiology ; Phosphorylation ; Potassium Chloride/pharmacology ; Precipitin Tests ; Promoter Regions, Genetic ; Rats ; *Repressor Proteins ; Rett Syndrome/genetics ; *Transcription, Genetic
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  • 5
    Publication Date: 2003-03-08
    Description: The mechanisms underlying experience-dependent plasticity in the brain may depend on the AMPA subclass of glutamate receptors (AMPA-Rs). We examined the trafficking of AMPA-Rs into synapses in the developing rat barrel cortex. In vivo gene delivery was combined with in vitro recordings to show that experience drives recombinant GluR1, an AMPA-R subunit, into synapses formed between layer 4 and layer 2/3 neurons. Moreover, expression of the GluR1 cytoplasmic tail, a construct that inhibits synaptic delivery of endogenous AMPA-Rs during long-term potentiation, blocked experience-driven synaptic potentiation. In general, synaptic incorporation of AMPA-Rs in vivo conforms to rules identified in vitro and contributes to plasticity driven by natural stimuli in the mammalian brain.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Takahashi, Takuya -- Svoboda, Karel -- Malinow, Roberto -- NS032827/NS/NINDS NIH HHS/ -- NS038259/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2003 Mar 7;299(5612):1585-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Jones Laboratory, Cold Spring Harbor Laboratory, Cold Spring Harbor, NY 11724, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12624270" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Electrophysiology ; Gene Transfer Techniques ; Long-Term Potentiation ; *Neuronal Plasticity ; Neurons/*metabolism/virology ; Patch-Clamp Techniques ; Rats ; Receptors, AMPA/genetics/*metabolism ; Recombinant Fusion Proteins/metabolism ; Sindbis Virus/genetics ; Somatosensory Cortex/*metabolism/virology ; Synapses/*metabolism ; *Synaptic Transmission ; Touch ; Vibrissae/physiology
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  • 6
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2000-08-12
    Description: On page 628, neuroscientists report that painful stimuli delivered to rats shortly after birth permanently rewire the spinal cord circuits that respond to pain. Not only do the circuits contain more axons, but the axons extend to more areas of the spinal cord than they normally would. The results should help convince skeptics of the importance of managing pain in human infants.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Helmuth, L -- New York, N.Y. -- Science. 2000 Jul 28;289(5479):521-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10939955" target="_blank"〉PubMed〈/a〉
    Keywords: Afferent Pathways ; Aging ; Animals ; Animals, Newborn ; Axons/*physiology ; Hindlimb/innervation ; Humans ; Infant, Newborn ; Inflammation/physiopathology ; *Pain ; Pain Threshold ; Rats ; Sciatic Nerve/*anatomy & histology/physiology ; Spinal Cord/*cytology
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  • 7
    Publication Date: 2000-05-20
    Description: A hippocampal pyramidal neuron receives more than 10(4) excitatory glutamatergic synapses. Many of these synapses contain the molecular machinery for messenger RNA translation, suggesting that the protein complement (and thus function) of each synapse can be regulated on the basis of activity. Here, local postsynaptic protein synthesis, triggered by synaptic activation of metabotropic glutamate receptors, was found to modify synaptic transmission within minutes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Huber, K M -- Kayser, M S -- Bear, M F -- New York, N.Y. -- Science. 2000 May 19;288(5469):1254-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Department of Neuroscience, Brown University, Providence, RI 02912, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10818003" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acids/pharmacology ; Animals ; Anisomycin/pharmacology ; Dendrites/drug effects/*metabolism ; Electric Stimulation ; Excitatory Amino Acid Antagonists/pharmacology ; Hippocampus/*metabolism/physiology ; Methoxyhydroxyphenylglycol/analogs & derivatives/pharmacology ; Nerve Tissue Proteins/antagonists & inhibitors/*biosynthesis/genetics ; Neural Inhibition/drug effects/*physiology ; Protein Biosynthesis/drug effects ; Protein Synthesis Inhibitors/pharmacology ; RNA, Messenger/metabolism ; Rats ; Receptors, Metabotropic Glutamate/*physiology ; Synaptic Transmission/drug effects/physiology ; Xanthenes/pharmacology
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  • 8
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2000-10-20
    Description: The hypothesis that learning occurs through long-term potentiation (LTP)- and long-term depression (LTD)-like mechanisms is widely held but unproven. This hypothesis makes three assumptions: Synapses are modifiable, they modify with learning, and they strengthen through an LTP-like mechanism. We previously established the ability for synaptic modification and a synaptic strengthening with motor skill learning in horizontal connections of the rat motor cortex (MI). Here we investigated whether learning strengthened these connections through LTP. We demonstrated that synapses in the trained MI were near the ceiling of their modification range, compared with the untrained MI, but the range of synaptic modification was not affected by learning. In the trained MI, LTP was markedly reduced and LTD was enhanced. These results are consistent with the use of LTP to strengthen synapses during learning.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rioult-Pedotti, M S -- Friedman, D -- Donoghue, J P -- NS27164/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2000 Oct 20;290(5491):533-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neuroscience, Brown University, Providence, RI 02912, USA. mengia_rioult@brown.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11039938" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Electric Stimulation ; Female ; Learning/*physiology ; Long-Term Potentiation/*physiology ; Models, Neurological ; Motor Cortex/*physiology ; Motor Skills ; Neuronal Plasticity ; Rats ; Rats, Sprague-Dawley ; Synapses/*physiology ; Synaptic Transmission
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  • 9
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2000-04-15
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Milligan, G -- New York, N.Y. -- Science. 2000 Apr 7;288(5463):65-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Biochemistry and Molecular Biology, Institute of Biomedical and Life Sciences, University of Glasgow, Scotland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10766637" target="_blank"〉PubMed〈/a〉
    Keywords: Adenylyl Cyclase Inhibitors ; Adenylyl Cyclases/metabolism ; Animals ; Cell Line ; Cerebral Cortex/metabolism ; Corpus Striatum/metabolism ; Dimerization ; Energy Transfer ; Fluorescence ; GTP-Binding Proteins/*metabolism ; Ligands ; Rats ; Receptor Cross-Talk ; Receptors, Dopamine D1/metabolism ; Receptors, Dopamine D2/agonists/*metabolism ; Receptors, Dopamine D5 ; Receptors, GABA-A/metabolism ; Receptors, Somatostatin/agonists/*metabolism ; Signal Transduction ; Somatostatin/metabolism
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  • 10
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2000-08-12
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zimmer, C -- New York, N.Y. -- Science. 2000 Jul 28;289(5479):525-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10939959" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Behavior, Animal ; Biological Evolution ; *Fear ; Female ; Humans ; Male ; *Personality ; Rats ; Toxoplasma/*physiology ; Toxoplasmosis, Animal/parasitology/*psychology ; Toxoplasmosis, Cerebral/parasitology/*psychology
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  • 11
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-02-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Malakoff, D -- New York, N.Y. -- Science. 2000 Oct 6;290(5489):23.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11183138" target="_blank"〉PubMed〈/a〉
    Keywords: Animal Testing Alternatives/*legislation & jurisprudence ; Animal Welfare/*legislation & jurisprudence ; Animals ; *Animals, Laboratory ; Birds ; Mice ; Rats ; United States ; United States Department of Agriculture/*legislation & jurisprudence
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  • 12
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2000-02-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Barinaga, M -- New York, N.Y. -- Science. 2000 Feb 11;287(5455):947-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10691562" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Apoptosis ; Benzodiazepines/adverse effects/toxicity ; Brain/cytology/*drug effects/growth & development ; Ethanol/blood/*toxicity ; Female ; Humans ; Infant, Newborn ; Nerve Degeneration ; Neurons/cytology/*drug effects ; Pregnancy ; Rats ; Receptors, GABA/*drug effects/metabolism ; Receptors, N-Methyl-D-Aspartate/antagonists & inhibitors/*drug effects/metabolism
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  • 13
    Publication Date: 2000-11-10
    Description: Reciprocal gene activation and restriction during cell type differentiation from a common lineage is a hallmark of mammalian organogenesis. A key question, then, is whether a critical transcriptional activator of cell type-specific gene targets can also restrict expression of the same genes in other cell types. Here, we show that whereas the pituitary-specific POU domain factor Pit-1 activates growth hormone gene expression in one cell type, the somatotrope, it restricts its expression from a second cell type, the lactotrope. This distinction depends on a two-base pair spacing in accommodation of the bipartite POU domains on a conserved growth hormone promoter site. The allosteric effect on Pit-1, in combination with other DNA binding factors, results in the recruitment of a corepressor complex, including nuclear receptor corepressor N-CoR, which, unexpectedly, is required for active long-term repression of the growth hormone gene in lactotropes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Scully, K M -- Jacobson, E M -- Jepsen, K -- Lunyak, V -- Viadiu, H -- Carriere, C -- Rose, D W -- Hooshmand, F -- Aggarwal, A K -- Rosenfeld, M G -- R01 DK18477/DK/NIDDK NIH HHS/ -- R01 DK54802/DK/NIDDK NIH HHS/ -- R01 GM49327/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2000 Nov 10;290(5494):1127-31.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Endocrinology and Metabolism, School of Medicine, University of California, San Diego, La Jolla, CA 92093, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11073444" target="_blank"〉PubMed〈/a〉
    Keywords: Allosteric Regulation ; Animals ; Base Sequence ; Binding Sites ; Cell Line ; Conserved Sequence ; Crystallization ; DNA/*metabolism ; DNA-Binding Proteins/chemistry/genetics/*metabolism ; Female ; *Gene Expression Regulation ; Genes, Reporter ; Growth Hormone/*genetics ; Male ; Mice ; Mice, Transgenic ; Models, Molecular ; Molecular Sequence Data ; Nuclear Proteins/genetics/metabolism ; Nuclear Receptor Co-Repressor 1 ; Pituitary Gland/cytology/*metabolism ; Prolactin/*genetics ; Promoter Regions, Genetic ; Protein Conformation ; Protein Structure, Tertiary ; Rats ; Repressor Proteins/chemistry/genetics/*metabolism ; Transcription Factor Pit-1 ; Transcription Factors/chemistry/genetics/*metabolism ; Transcriptional Activation
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  • 14
    Publication Date: 2000-02-11
    Description: DARPP-32, a dopamine- and adenosine 3',5'-monophosphate (cAMP)-regulated phosphoprotein (32 kilodaltons in size), is an obligate intermediate in progesterone (P)-facilitated sexual receptivity in female rats and mice. The facilitative effect of P on sexual receptivity in female rats was blocked by antisense oligonucleotides to DARPP-32. Homozygous mice carrying a null mutation for the DARPP-32 gene exhibited minimal levels of P-facilitated sexual receptivity when compared to their wild-type littermates. P significantly increased hypothalamic cAMP levels and cAMP-dependent protein kinase activity. These increases were not inhibited by a D1 subclass dopamine receptor antagonist. P also enhanced phosphorylation of DARPP-32 on threonine 34 in the hypothalamus of mice. DARPP-32 activation is thus an obligatory step in progestin receptor regulation of sexual receptivity in rats and mice.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mani, S K -- Fienberg, A A -- O'Callaghan, J P -- Snyder, G L -- Allen, P B -- Dash, P K -- Moore, A N -- Mitchell, A J -- Bibb, J -- Greengard, P -- O'Malley, B W -- MH49662/MH/NIMH NIH HHS/ -- MH57442/MH/NIMH NIH HHS/ -- NS 35457/NS/NINDS NIH HHS/ -- etc. -- New York, N.Y. -- Science. 2000 Feb 11;287(5455):1053-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 77030, USA. smani@bcm.tmc.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10669419" target="_blank"〉PubMed〈/a〉
    Keywords: 2,3,4,5-Tetrahydro-7,8-dihydroxy-1-phenyl-1H-3-benzazepine/pharmacology ; Animals ; Cyclic AMP/metabolism ; Cyclic AMP-Dependent Protein Kinases/metabolism ; Dopamine/pharmacology ; Dopamine Agonists/pharmacology ; Dopamine and cAMP-Regulated Phosphoprotein 32 ; Female ; Hypothalamus/metabolism ; Injections, Intraventricular ; Male ; Mice ; Mice, Inbred C57BL ; Mice, Knockout ; *Nerve Tissue Proteins ; Oligonucleotides, Antisense/pharmacology ; Phosphoproteins/genetics/*metabolism ; Phosphorylation ; Posture ; Progesterone/*pharmacology ; Proteins/genetics/metabolism ; Rats ; Rats, Sprague-Dawley ; Receptors, Progesterone/metabolism ; Serotonin/pharmacology ; Sexual Behavior, Animal/*drug effects ; Signal Transduction
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  • 15
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2000-09-30
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marcus, M -- New York, N.Y. -- Science. 2000 Sep 15;289(5486):1878.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11012357" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Newborn/physiology ; Embryonic and Fetal Development ; Female ; *Food Preferences/physiology ; Humans ; Rats ; *Taste
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  • 16
    Publication Date: 2001-11-10
    Description: We describe a molecular switch based on the controlled methylation of nucleosome and the transcriptional cofactors, the CREB-binding proteins (CBP)/p300. The CBP/p300 methylation site is localized to an arginine residue that is essential for stabilizing the structure of the KIX domain, which mediates CREB recruitment. Methylation of KIX by coactivator-associated arginine methyltransferase 1 (CARM1) blocks CREB activation by disabling the interaction between KIX and the kinase inducible domain (KID) of CREB. Thus, CARM1 functions as a corepressor in cyclic adenosine monophosphate signaling pathway via its methyltransferase activity while acting as a coactivator for nuclear hormones. These results provide strong in vivo and in vitro evidence that histone methylation plays a key role in hormone-induced gene activation and define cofactor methylation as a new regulatory mechanism in hormone signaling.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Xu, W -- Chen, H -- Du, K -- Asahara, H -- Tini, M -- Emerson, B M -- Montminy, M -- Evans, R M -- 9R01DK57978/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 2001 Dec 21;294(5551):2507-11. Epub 2001 Nov 8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Gene Expression Laboratory, Department of Biological Chemistry, University of California Davis Cancer Center/Basic Science, Sacramento, CA 95817, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11701890" target="_blank"〉PubMed〈/a〉
    Keywords: Acetyltransferases/metabolism ; Amino Acid Sequence ; Animals ; Apoptosis ; Cell Line ; Cyclic AMP Response Element-Binding Protein/metabolism ; Dimerization ; E1A-Associated p300 Protein ; *Gene Expression Regulation ; Genes, Reporter ; Histone Acetyltransferases ; Histones/metabolism ; Methylation ; Molecular Sequence Data ; Nerve Growth Factor/pharmacology ; Nuclear Proteins/chemistry/*metabolism ; PC12 Cells ; Protein Structure, Tertiary ; Protein-Arginine N-Methyltransferases/*metabolism ; Rats ; Receptors, Retinoic Acid/*metabolism ; Recombinant Fusion Proteins/metabolism ; Retinoid X Receptors ; *Saccharomyces cerevisiae Proteins ; Signal Transduction ; Somatostatin/genetics ; Trans-Activators/chemistry/*metabolism ; Transcription Factors/metabolism ; *Transcription, Genetic ; Transcriptional Activation ; Transfection ; Tretinoin/metabolism/pharmacology
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  • 17
    Publication Date: 2001-04-17
    Description: In mammals, the central circadian pacemaker resides in the hypothalamic suprachiasmatic nucleus (SCN), but circadian oscillators also exist in peripheral tissues. Here, using wild-type and cryptochrome (mCry)-deficient cell lines derived from mCry mutant mice, we show that the peripheral oscillator in cultured fibroblasts is identical to the oscillator in the SCN in (i) temporal expression profiles of all known clock genes, (ii) the phase of the various mRNA rhythms (i.e., antiphase oscillation of Bmal1 and mPer genes), (iii) the delay between maximum mRNA levels and appearance of nuclear mPER1 and mPER2 protein, (iv) the inability to produce oscillations in the absence of functional mCry genes, and (v) the control of period length by mCRY proteins.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yagita, K -- Tamanini, F -- van Der Horst, G T -- Okamura, H -- New York, N.Y. -- Science. 2001 Apr 13;292(5515):278-81.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Molecular Brain Science, Department of Brain Sciences, Kobe University Graduate School of Medicine, Chuo-ku, Kobe 650-0017, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11303101" target="_blank"〉PubMed〈/a〉
    Keywords: ARNTL Transcription Factors ; Animals ; Basic Helix-Loop-Helix Transcription Factors ; Biological Clocks/*genetics ; CLOCK Proteins ; Cell Cycle Proteins ; Cell Line ; Cell Nucleus/metabolism ; Circadian Rhythm/*genetics ; Cryptochromes ; *DNA-Binding Proteins ; *Drosophila Proteins ; Endothelin-1/pharmacology ; *Eye Proteins ; Fibroblasts/*physiology ; Flavoproteins/genetics/metabolism ; Gene Expression Profiling ; *Gene Expression Regulation ; Nuclear Proteins/genetics/metabolism ; Period Circadian Proteins ; *Photoreceptor Cells, Invertebrate ; RNA, Messenger/genetics/metabolism ; Rats ; Receptors, G-Protein-Coupled ; Suprachiasmatic Nucleus/metabolism ; Time Factors ; Trans-Activators/genetics/metabolism ; Transcription Factors/genetics/metabolism
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  • 18
    Publication Date: 2001-09-05
    Description: We show that high doses of salicylates reverse hyperglycemia, hyperinsulinemia, and dyslipidemia in obese rodents by sensitizing insulin signaling. Activation or overexpression of the IkappaB kinase beta (IKKbeta) attenuated insulin signaling in cultured cells, whereas IKKbeta inhibition reversed insulin resistance. Thus, IKKbeta, rather than the cyclooxygenases, appears to be the relevant molecular target. Heterozygous deletion (Ikkbeta+/-) protected against the development of insulin resistance during high-fat feeding and in obese Lep(ob/ob) mice. These findings implicate an inflammatory process in the pathogenesis of insulin resistance in obesity and type 2 diabetes mellitus and identify the IKKbeta pathway as a target for insulin sensitization.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yuan, M -- Konstantopoulos, N -- Lee, J -- Hansen, L -- Li, Z W -- Karin, M -- Shoelson, S E -- AI43477/AI/NIAID NIH HHS/ -- DK45493/DK/NIDDK NIH HHS/ -- DK51729/DK/NIDDK NIH HHS/ -- New York, N.Y. -- Science. 2001 Aug 31;293(5535):1673-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Joslin Diabetes Center and Department of Medicine, Harvard Medical School, Boston, MA 02215, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11533494" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Anti-Inflammatory Agents, Non-Steroidal/pharmacology ; Aspirin/administration & dosage/*pharmacology ; Blood Glucose/metabolism ; Cell Line ; Dietary Fats/*administration & dosage ; Gene Deletion ; Gene Targeting ; Glucose Tolerance Test ; I-kappa B Kinase ; Insulin/administration & dosage/blood/*metabolism/pharmacology ; *Insulin Resistance ; Lipids/blood ; Liver/metabolism ; Male ; Mice ; Mice, Obese ; Muscles/metabolism ; Obesity/metabolism/*physiopathology ; Phosphorylation ; Prostaglandin-Endoperoxide Synthases/genetics/metabolism ; Protein-Serine-Threonine Kinases/antagonists & inhibitors/genetics/*metabolism ; Rats ; Rats, Zucker ; Receptor, Insulin/metabolism ; Signal Transduction ; Sodium Salicylate/administration & dosage/*pharmacology ; Tumor Necrosis Factor-alpha/pharmacology
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  • 19
    Publication Date: 2001-01-06
    Description: Most traditional cytotoxic anticancer agents ablate the rapidly dividing epithelium of the hair follicle and induce alopecia (hair loss). Inhibition of cyclin-dependent kinase 2 (CDK2), a positive regulator of eukaryotic cell cycle progression, may represent a therapeutic strategy for prevention of chemotherapy-induced alopecia (CIA) by arresting the cell cycle and reducing the sensitivity of the epithelium to many cell cycle-active antitumor agents. Potent small-molecule inhibitors of CDK2 were developed using structure-based methods. Topical application of these compounds in a neonatal rat model of CIA reduced hair loss at the site of application in 33 to 50% of the animals. Thus, inhibition of CDK2 represents a potentially useful approach for the prevention of CIA in cancer patients.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davis, S T -- Benson, B G -- Bramson, H N -- Chapman, D E -- Dickerson, S H -- Dold, K M -- Eberwein, D J -- Edelstein, M -- Frye, S V -- Gampe Jr, R T -- Griffin, R J -- Harris, P A -- Hassell, A M -- Holmes, W D -- Hunter, R N -- Knick, V B -- Lackey, K -- Lovejoy, B -- Luzzio, M J -- Murray, D -- Parker, P -- Rocque, W J -- Shewchuk, L -- Veal, J M -- Walker, D H -- Kuyper, L F -- New York, N.Y. -- Science. 2001 Jan 5;291(5501):134-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cancer Biology, Glaxo Wellcome Research and Development, Research Triangle Park, NC 27709, USA. std41085@glaxowellcome.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11141566" target="_blank"〉PubMed〈/a〉
    Keywords: Alopecia/*chemically induced/*prevention & control ; Animals ; Animals, Newborn ; Antineoplastic Agents/*toxicity ; Antineoplastic Combined Chemotherapy Protocols/toxicity ; Apoptosis/drug effects ; *CDC2-CDC28 Kinases ; Cell Cycle/drug effects ; Cell Line ; Cyclin-Dependent Kinase 2 ; Cyclin-Dependent Kinases/*antagonists & inhibitors/metabolism ; Cyclophosphamide/toxicity ; Cytoprotection/drug effects ; DNA/biosynthesis ; Doxorubicin/toxicity ; Drug Design ; Enzyme Inhibitors/chemical synthesis/chemistry/*pharmacology ; Epithelium/drug effects ; Etoposide/toxicity ; Hair Follicle/cytology/*drug effects ; Humans ; Indoles/chemical synthesis/chemistry/*pharmacology ; Mice ; Mice, SCID ; Phosphorylation ; Protein-Serine-Threonine Kinases/*antagonists & inhibitors/metabolism ; Rats ; Retinoblastoma Protein/metabolism ; Scalp/transplantation ; Sulfonamides/chemical synthesis/chemistry/*pharmacology ; Transplantation, Heterologous
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  • 20
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-04-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gupta, A -- Tsai, L H -- New York, N.Y. -- Science. 2001 Apr 13;292(5515):236-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pathology, Harvard Medical School and Howard Hughes Medical Institute, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11305318" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cocaine/*pharmacology ; Corpus Striatum/*drug effects/metabolism ; Cyclic AMP-Dependent Protein Kinases/antagonists & inhibitors/metabolism ; Cyclin-Dependent Kinase 5 ; Cyclin-Dependent Kinases/antagonists & inhibitors/genetics/*metabolism ; Dopamine/metabolism ; Dopamine Uptake Inhibitors/*pharmacology ; Dopamine and cAMP-Regulated Phosphoprotein 32 ; Mice ; Mice, Knockout ; Motor Activity/drug effects ; Nerve Tissue Proteins/metabolism ; Neurons/metabolism ; Phosphoprotein Phosphatases/antagonists & inhibitors/metabolism ; Phosphoproteins/metabolism ; Phosphorylation ; Proto-Oncogene Proteins c-fos/metabolism ; Rats ; Signal Transduction
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  • 21
    Publication Date: 2001-06-02
    Description: The GGAs are a multidomain protein family implicated in protein trafficking between the Golgi and endosomes. Here, the VHS domain of GGA2 was shown to bind to the acidic cluster-dileucine motif in the cytoplasmic tail of the cation-independent mannose 6-phosphate receptor (CI-MPR). Receptors with mutations in this motif were defective in lysosomal enzyme sorting. The hinge domain of GGA2 bound clathrin, suggesting that GGA2 could be a link between cargo molecules and clathrin-coated vesicle assembly. Thus, GGA2 binding to the CI-MPR is important for lysosomal enzyme targeting.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zhu, Y -- Doray, B -- Poussu, A -- Lehto, V P -- Kornfeld, S -- R01 CA-08759/CA/NCI NIH HHS/ -- New York, N.Y. -- Science. 2001 Jun 1;292(5522):1716-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Internal Medicine, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, MO 63110, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11387476" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptor Proteins, Vesicular Transport ; Amino Acid Motifs ; Amino Acid Sequence ; Animals ; *Carrier Proteins ; Cations ; Clathrin/metabolism ; Dipeptides/chemistry/metabolism ; L Cells (Cell Line) ; Lysosomes/*enzymology ; Mice ; Molecular Sequence Data ; Mutation ; Protein Sorting Signals ; Protein Structure, Tertiary ; *Protein Transport ; Proteins/chemistry/genetics/*metabolism ; Rats ; Receptor, IGF Type 2/*chemistry/genetics/*metabolism ; Recombinant Fusion Proteins/chemistry/metabolism ; Solubility ; Transcription Factor AP-1/metabolism ; Transport Vesicles/metabolism ; Two-Hybrid System Techniques ; trans-Golgi Network/metabolism
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  • 22
    Publication Date: 2001-04-28
    Description: The protective antigen moiety of anthrax toxin translocates the toxin's enzymic moieties to the cytosol of mammalian cells by a mechanism that depends on its ability to heptamerize and insert into membranes. We identified dominant-negative mutants of protective antigen that co-assemble with the wild-type protein and block its ability to translocate the enzymic moieties across membranes. These mutants strongly inhibited toxin action in cell culture and in an animal intoxication model, suggesting that they could be useful in therapy of anthrax.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Sellman, B R -- Mourez, M -- Collier, R J -- 5T32AI07410/AI/NIAID NIH HHS/ -- R37-AI22021/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2001 Apr 27;292(5517):695-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Microbiology and Molecular Genetics, Harvard Medical School, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11326092" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Anthrax/*drug therapy ; *Antigens, Bacterial ; Bacterial Toxins/*antagonists & inhibitors/*genetics/metabolism/toxicity ; CHO Cells ; Cell Membrane/metabolism ; Cricetinae ; Endocytosis ; Genes, Dominant ; Male ; *Mutation ; Protein Transport ; Rats ; Rats, Inbred F344 ; Receptors, Peptide/metabolism
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  • 23
    Publication Date: 2001-02-07
    Description: Although astrocytes constitute nearly half of the cells in our brain, their function is a long-standing neurobiological mystery. Here we show by quantal analyses, FM1-43 imaging, immunostaining, and electron microscopy that few synapses form in the absence of glial cells and that the few synapses that do form are functionally immature. Astrocytes increase the number of mature, functional synapses on central nervous system (CNS) neurons by sevenfold and are required for synaptic maintenance in vitro. We also show that most synapses are generated concurrently with the development of glia in vivo. These data demonstrate a previously unknown function for glia in inducing and stabilizing CNS synapses, show that CNS synapse number can be profoundly regulated by nonneuronal signals, and raise the possibility that glia may actively participate in synaptic plasticity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ullian, E M -- Sapperstein, S K -- Christopherson, K S -- Barres, B A -- NS10784/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2001 Jan 26;291(5504):657-61.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Stanford University School of Medicine, Department of Neurobiology, Fairchild Science Building, Stanford, CA 94305-5125, USA. emu@stanford.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11158678" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Astrocytes/*physiology ; Calcium/metabolism ; *Calcium-Binding Proteins ; Cell Communication ; Cells, Cultured ; Coculture Techniques ; Excitatory Postsynaptic Potentials ; Fluorescent Dyes/metabolism ; Glutamic Acid/pharmacology ; Ionomycin/pharmacology ; Membrane Glycoproteins/metabolism ; Microscopy, Electron ; Nerve Tissue Proteins/metabolism ; Neuronal Plasticity ; Patch-Clamp Techniques ; Pyridinium Compounds/metabolism ; Quaternary Ammonium Compounds/metabolism ; Rats ; Rats, Sprague-Dawley ; Retinal Ganglion Cells/*physiology/ultrastructure ; Superior Colliculi/embryology/growth & development/ultrastructure ; Synapses/*physiology/ultrastructure ; Synaptic Transmission ; Synaptic Vesicles/metabolism ; Synaptophysin/metabolism ; Synaptotagmins
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  • 24
    Publication Date: 2001-09-29
    Description: Synapses in the central nervous system are usually defined by presynaptic exocytotic release sites and postsynaptic differentiations. We report here a demonstration of dendrodendritic inhibition that does not engage a conventional synapse. Using amperometric and patch-clamp recordings in rat brain slices of the substantia nigra, we found that blockade of the dopamine transporter abolished the dendritic release of dopamine and the resulting self-inhibition. These findings demonstrate that dendrodendritic autoinhibition entails the carrier-mediated release of dopamine rather than conventional exocytosis. This suggests that some widely used antidepressants that inhibit the dopamine transporter may benefit patients in the early stages of Parkinson's disease.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Falkenburger, B H -- Barstow, K L -- Mintz, I M -- R01-3445/PHS HHS/ -- New York, N.Y. -- Science. 2001 Sep 28;293(5539):2465-70.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology and Experimental Therapeutics, Boston University Medical Center, Boston, MA 02118, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11577238" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Transport/drug effects ; Calcium/metabolism ; Carrier Proteins/antagonists & inhibitors/*metabolism ; Dendrites/*metabolism ; Dopamine/*metabolism ; Dopamine D2 Receptor Antagonists ; Dopamine Plasma Membrane Transport Proteins ; Electric Stimulation ; Electrophysiology ; Evoked Potentials/drug effects ; Excitatory Postsynaptic Potentials ; Exocytosis ; Glutamic Acid/pharmacology ; Humans ; In Vitro Techniques ; *Membrane Glycoproteins ; Membrane Potentials ; *Membrane Transport Proteins ; *Nerve Tissue Proteins ; Neural Inhibition ; Neurons/metabolism ; Parkinson Disease/drug therapy/metabolism ; Patch-Clamp Techniques ; Piperazines/pharmacology ; Rats ; Receptors, Dopamine D2/metabolism ; Sodium/metabolism ; Substantia Nigra/cytology/*metabolism ; Subthalamic Nucleus/physiology
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  • 25
    Publication Date: 2001-05-26
    Description: Impulsive choice is exemplified by choosing a small or poor reward that is available immediately, in preference to a larger but delayed reward. Impulsive choice contributes to drug addiction, attention-deficit/hyperactivity disorder, mania, and personality disorders, but its neuroanatomical basis is unclear. Here, we show that selective lesions of the nucleus accumbens core induce persistent impulsive choice in rats. In contrast, damage to two of its afferents, the anterior cingulate cortex and medial prefrontal cortex, had no effect on this capacity. Thus, dysfunction of the nucleus accumbens core may be a key element in the neuropathology of impulsivity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Cardinal, R N -- Pennicott, D R -- Sugathapala, C L -- Robbins, T W -- Everitt, B J -- G9537855/Medical Research Council/United Kingdom -- New York, N.Y. -- Science. 2001 Jun 29;292(5526):2499-501. Epub 2001 May 24.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Experimental Psychology, University of Cambridge, Downing Street, Cambridge CB2 3EB, UK. rudolf.cardinal@pobox.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11375482" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Attention ; Attention Deficit Disorder with Hyperactivity ; Behavior, Animal ; Brain Mapping ; *Choice Behavior ; Disease Models, Animal ; Gyrus Cinguli/physiology ; *Impulsive Behavior ; Motor Activity ; Nucleus Accumbens/*physiology/surgery ; Prefrontal Cortex/physiology ; Random Allocation ; Rats ; Reinforcement (Psychology) ; Reward
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  • 26
    Publication Date: 2001-05-12
    Description: Treatment efforts for cocaine addiction are hampered by high relapse rates. To map brain areas underlying relapse, we used electrical brain stimulation and intracranial injection of pharmacological compounds after extinction of cocaine self-administration behavior in rats. Electrical stimulation of the hippocampus containing glutamatergic fibers, but not the medial forebrain bundle containing dopaminergic fibers, elicited cocaine-seeking behavior dependent on glutamate in the ventral tegmental area. This suggests a role for glutamatergic neurotransmission in relapse to cocaine abuse. The medial forebrain bundle electrodes supported intense electrical self-stimulation. These findings suggest a dissociation of neural systems subserving positive reinforcement (self-stimulation) and incentive motivation (relapse).〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vorel, S R -- Liu, X -- Hayes, R J -- Spector, J A -- Gardner, E L -- New York, N.Y. -- Science. 2001 May 11;292(5519):1175-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neuroscience, Department of Psychiatry and Behavioral Sciences, Albert Einstein College of Medicine, Bronx, NY 10461, USA. robvorel@hotmail.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11349151" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cocaine/administration & dosage/pharmacology ; Cocaine-Related Disorders/*physiopathology/prevention & control ; Conditioning, Operant/drug effects/physiology ; Dopamine/physiology ; Electric Stimulation ; Electrodes ; Excitatory Amino Acid Agonists/pharmacology ; Excitatory Amino Acid Antagonists/pharmacology ; Extinction, Psychological/drug effects/physiology ; Glutamic Acid/*physiology ; Hippocampus/cytology/*physiology ; Injections, Intravenous ; Kynurenic Acid/pharmacology ; Medial Forebrain Bundle/cytology/drug effects/physiology ; Memory/physiology ; N-Methylaspartate/pharmacology ; Rats ; Rats, Long-Evans ; Recurrence ; Reward ; Self Administration ; Synaptic Transmission/drug effects ; *Theta Rhythm ; Ventral Tegmental Area/cytology/drug effects/physiology
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  • 27
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-06-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nestler, E J -- New York, N.Y. -- Science. 2001 Jun 22;292(5525):2266-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Psychiatry and Center for Basic Neuroscience, University of Texas Southwestern Medical Center, Dallas, TX 75390--9070, USA. eric.nestler@utsouthwestern.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11423644" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain/drug effects/physiology/physiopathology ; Calcium/metabolism ; Calcium Signaling ; Cocaine/*pharmacology ; Cocaine-Related Disorders/*physiopathology ; Dopamine/metabolism ; Glutamic Acid/metabolism ; Hippocampus/physiology ; *Long-Term Potentiation ; Memory/*physiology ; Neurons/*drug effects/physiology ; Rats ; Receptors, AMPA/metabolism ; Receptors, N-Methyl-D-Aspartate/metabolism ; Synaptic Transmission/drug effects ; Ventral Tegmental Area/*drug effects/physiology
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  • 28
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-05-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Holden, C -- New York, N.Y. -- Science. 2001 May 11;292(5519):1039.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11352038" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cocaine/administration & dosage/pharmacology ; Cocaine-Related Disorders/*physiopathology ; Conditioning, Operant/drug effects/physiology ; Dopamine/physiology ; Electric Stimulation ; Extinction, Psychological/drug effects/physiology ; Glutamic Acid/*physiology ; Hippocampus/drug effects/*physiology ; Injections, Intravenous ; Medial Forebrain Bundle/drug effects/physiology ; Memory/*physiology ; Rats ; Recurrence ; Reward ; Self Administration ; Ventral Tegmental Area/drug effects/physiology
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  • 29
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-11-27
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Malakoff, D -- New York, N.Y. -- Science. 2001 Nov 23;294(5547):1637.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11721028" target="_blank"〉PubMed〈/a〉
    Keywords: *Animal Experimentation ; Animal Rights/economics/legislation & jurisprudence ; Animal Welfare/economics/*legislation & jurisprudence ; Animals ; Birds ; Government ; *Government Regulation ; Housing, Animal/economics/legislation & jurisprudence ; Mice ; *Models, Animal ; Rats ; Research Design/legislation & jurisprudence ; *Rodentia ; United States ; United States Department of Agriculture/*legislation & jurisprudence
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  • 30
    Publication Date: 2001-11-27
    Description: Multiple sclerosis is a demyelinating disease, characterized by inflammation in the brain and spinal cord, possibly due to autoimmunity. Large-scale sequencing of cDNA libraries, derived from plaques dissected from brains of patients with multiple sclerosis (MS), indicated an abundance of transcripts for osteopontin (OPN). Microarray analysis of spinal cords from rats paralyzed by experimental autoimmune encephalomyelitis (EAE), a model of MS, also revealed increased OPN transcripts. Osteopontin-deficient mice were resistant to progressive EAE and had frequent remissions, and myelin-reactive T cells in OPN-/- mice produced more interleukin 10 and less interferon-gamma than in OPN+/+ mice. Osteopontin thus appears to regulate T helper cell-1 (TH1)-mediated demyelinating disease, and it may offer a potential target in blocking development of progressive MS.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chabas, D -- Baranzini, S E -- Mitchell, D -- Bernard, C C -- Rittling, S R -- Denhardt, D T -- Sobel, R A -- Lock, C -- Karpuj, M -- Pedotti, R -- Heller, R -- Oksenberg, J R -- Steinman, L -- New York, N.Y. -- Science. 2001 Nov 23;294(5547):1731-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurology and Neurological Sciences, Beckman Center for Molecular Medicine, B002, Stanford, CA 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11721059" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Encephalomyelitis, Autoimmune, ; Experimental/genetics/immunology/metabolism/pathology ; Expressed Sequence Tags ; Gene Deletion ; *Gene Expression Profiling ; Gene Library ; Humans ; Inflammation/genetics/immunology/metabolism/pathology ; Interferon-gamma/genetics/metabolism ; Interleukin-10/genetics/metabolism ; Lymphocyte Activation ; Mice ; Mice, Knockout ; Multiple Sclerosis/*genetics/immunology/*metabolism/pathology ; Oligonucleotide Array Sequence Analysis ; Osteopontin ; RNA, Messenger/genetics/metabolism ; Rats ; Sialoglycoproteins/deficiency/genetics/*metabolism ; Spinal Cord/metabolism ; Th1 Cells/immunology
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  • 31
    Publication Date: 2001-11-03
    Description: In the exocytosis of neurotransmitter, fusion pore opening represents the first instant of fluid contact between the vesicle lumen and extracellular space. The existence of the fusion pore has been established by electrical measurements, but its molecular composition is unknown. The possibility that synaptotagmin regulates fusion pores was investigated with amperometry to monitor exocytosis of single dense-core vesicles. Overexpression of synaptotagmin I prolonged the time from fusion pore opening to dilation, whereas synaptotagmin IV shortened this time. Both synaptotagmin isoforms reduced norepinephrine flux through open fusion pores. Thus, synaptotagmin interacts with fusion pores, possibly by associating with a core complex of membrane proteins and/or lipid.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wang, C T -- Grishanin, R -- Earles, C A -- Chang, P Y -- Martin, T F -- Chapman, E R -- Jackson, M B -- New York, N.Y. -- Science. 2001 Nov 2;294(5544):1111-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, University of Wisconsin Medical School, University of Wisconsin, Madison, WI 53706, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11691996" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium/metabolism ; Calcium Channels, P-Type/metabolism ; Calcium Channels, Q-Type/metabolism ; *Calcium-Binding Proteins ; Cell Membrane Structures/*metabolism ; Chromogranins/metabolism ; Electrophysiology ; *Exocytosis ; Kinetics ; *Membrane Fusion ; Membrane Glycoproteins/*metabolism ; Membrane Potentials ; Nerve Tissue Proteins/*metabolism ; Neurotransmitter Agents/*metabolism ; Norepinephrine/metabolism ; PC12 Cells ; Protein Isoforms ; Rats ; Recombinant Fusion Proteins/metabolism ; Secretory Vesicles/*metabolism ; Synaptic Transmission ; Synaptic Vesicles/metabolism ; Synaptotagmin I ; Synaptotagmins
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  • 32
    Publication Date: 2001-09-22
    Description: The dendritic arbor of pyramidal neurons is not a monolithic structure. We show here that the excitability of terminal apical dendrites differs from that of the apical trunk. In response to fluorescence-guided focal photolysis of caged glutamate, individual terminal apical dendrites generated cadmium-sensitive all-or-none responses that were subthreshold for somatic action potentials. Calcium transients produced by all-or-none responses were not restricted to the sites of photolysis, but occurred throughout individual distal dendritic compartments, indicating that electrogenesis is mediated primarily by voltage-gated calcium channels. Compartmentalized and binary behavior of parallel-connected terminal dendrites can greatly expand the computational power of a single neuron.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wei, D S -- Mei, Y A -- Bagal, A -- Kao, J P -- Thompson, S M -- Tang, C M -- New York, N.Y. -- Science. 2001 Sep 21;293(5538):2272-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Departments of Neurology, University of Maryland School of Medicine, Baltimore, MD 21201, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11567143" target="_blank"〉PubMed〈/a〉
    Keywords: 2-Amino-5-phosphonovalerate/pharmacology ; Action Potentials ; Animals ; Cadmium/pharmacology ; Calcium/metabolism ; Calcium Channels/metabolism ; Calcium Signaling ; Cesium/pharmacology ; Dendrites/*physiology ; Egtazic Acid/analogs & derivatives/pharmacology ; Glutamates ; Hippocampus/*cytology/physiology ; Light ; Organ Culture Techniques ; Patch-Clamp Techniques ; Photolysis ; Pyramidal Cells/drug effects/*physiology/ultrastructure ; Quinoxalines/pharmacology ; Rats ; Receptors, AMPA/metabolism ; Receptors, N-Methyl-D-Aspartate/metabolism ; Tetrodotoxin/pharmacology
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  • 33
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-03-10
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Garrison, H H -- New York, N.Y. -- Science. 2001 Feb 9;291(5506):986-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11232582" target="_blank"〉PubMed〈/a〉
    Keywords: Animal Welfare/*legislation & jurisprudence ; Animals ; *Animals, Laboratory ; Birds ; Mice ; Rats ; *Research Personnel ; Surveys and Questionnaires ; United States
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  • 34
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-11-03
    Description: Highly orchestrated molecular rearrangements are required for two membranes to fuse, as happens, for example, during neurotransmitter release into the synapse. In an elegant Perspective, Scales et al. discuss two studies (Schoch et al., Wang et al.) that shed new light on the protein interactions involved in membrane fusion.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Scales, S J -- Finley, M F -- Scheller, R H -- New York, N.Y. -- Science. 2001 Nov 2;294(5544):1015-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Genentech Inc., South San Francisco, CA 94080, USA. sscales@gene.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11691976" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Calcium/metabolism ; Calcium Signaling ; *Calcium-Binding Proteins ; Catecholamines/metabolism ; Cell Membrane/metabolism ; Cells, Cultured ; Electrophysiology ; *Membrane Fusion ; Membrane Glycoproteins/*physiology ; Membrane Proteins/*physiology ; Mice ; Nerve Tissue Proteins/*physiology ; Neurotransmitter Agents/metabolism ; PC12 Cells ; Phospholipids/metabolism ; Protein Isoforms ; R-SNARE Proteins ; Rats ; SNARE Proteins ; Secretory Vesicles/*metabolism ; Synapses/physiology ; Synaptic Transmission ; Synaptic Vesicles/*metabolism ; Synaptotagmins ; *Vesicular Transport Proteins
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  • 35
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-05-02
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Olsnes, S -- Wesche, J -- New York, N.Y. -- Science. 2001 Apr 27;292(5517):647-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biochemistry, Institute for Cancer Research, Norwegian Radium Hospital, Oslo, Norway. olsnes@radium.uio.no〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11330322" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Anthrax/*drug therapy ; *Antigens, Bacterial ; Bacterial Toxins/*antagonists & inhibitors/*genetics/metabolism/toxicity ; Cell Membrane/metabolism ; Cytoplasm/metabolism ; Endocytosis ; *Mutation ; Protein Transport ; Rats
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  • 36
    Publication Date: 2001-02-13
    Description: We cloned and characterized a protein kinase and ion channel, TRP-PLIK. As part of the long transient receptor potential channel subfamily implicated in control of cell division, it is a protein that is both an ion channel and a protein kinase. TRP-PLIK phosphorylated itself, displayed a wide tissue distribution, and, when expressed in CHO-K1 cells, constituted a nonselective, calcium-permeant, 105-picosiemen, steeply outwardly rectifying conductance. The zinc finger containing alpha-kinase domain was functional. Inactivation of the kinase activity by site-directed mutagenesis and the channel's dependence on intracellular adenosine triphosphate (ATP) demonstrated that the channel's kinase activity is essential for channel function.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Runnels, L W -- Yue, L -- Clapham, D E -- New York, N.Y. -- Science. 2001 Feb 9;291(5506):1043-7. Epub 2001 Jan 18.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Cardiology, Department of Neurobiology, Harvard Medical School, 1309 Enders Building, 320 Longwood Avenue, Children's Hospital, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11161216" target="_blank"〉PubMed〈/a〉
    Keywords: Adenosine Triphosphate/metabolism ; Amino Acid Motifs ; Amino Acid Sequence ; Animals ; CHO Cells ; Calcium/metabolism ; Catalytic Domain ; Cations/metabolism ; Cell Line ; Cricetinae ; DNA, Complementary ; Electric Conductivity ; Humans ; Ion Channels/chemistry/*genetics/*metabolism ; *Membrane Proteins ; Mice ; Molecular Sequence Data ; Mutation ; Myelin Basic Protein/metabolism ; Patch-Clamp Techniques ; Phosphorylation ; Protein Kinases/chemistry/*genetics/*metabolism ; Protein-Serine-Threonine Kinases ; Rats ; Recombinant Fusion Proteins/chemistry/metabolism ; TRPM Cation Channels ; Transfection ; Two-Hybrid System Techniques ; Type C Phospholipases/metabolism
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  • 37
    Publication Date: 2001-02-13
    Description: Circadian rhythms of behavior are driven by oscillators in the brain that are coupled to the environmental light cycle. Circadian rhythms of gene expression occur widely in peripheral organs. It is unclear how these multiple rhythms are coupled together to form a coherent system. To study such coupling, we investigated the effects of cycles of food availability (which exert powerful entraining effects on behavior) on the rhythms of gene expression in the liver, lung, and suprachiasmatic nucleus (SCN). We used a transgenic rat model whose tissues express luciferase in vitro. Although rhythmicity in the SCN remained phase-locked to the light-dark cycle, restricted feeding rapidly entrained the liver, shifting its rhythm by 10 hours within 2 days. Our results demonstrate that feeding cycles can entrain the liver independently of the SCN and the light cycle, and they suggest the need to reexamine the mammalian circadian hierarchy. They also raise the possibility that peripheral circadian oscillators like those in the liver may be coupled to the SCN primarily through rhythmic behavior, such as feeding.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stokkan, K A -- Yamazaki, S -- Tei, H -- Sakaki, Y -- Menaker, M -- MH 56647/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 2001 Jan 19;291(5503):490-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉National Science Foundation Center for Biological Timing and Department of Biology, University of Virginia, P.O. Box 400328, Charlottesville, VA 22904-4328, USA. mm7e@virginia.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11161204" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Genetically Modified ; *Circadian Rhythm ; Corticosterone/blood/pharmacology ; Culture Techniques ; Eating ; Female ; *Food ; *Gene Expression Regulation ; Genes, Reporter ; Liver/*physiology ; Luciferases/genetics ; Lung/physiology ; Male ; Motor Activity ; Organ Specificity ; Rats ; Suprachiasmatic Nucleus/physiology
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  • 38
    Publication Date: 2002-09-14
    Description: Mutations in the BRCA2 (breast cancer susceptibility gene 2) tumor suppressor lead to chromosomal instability due to defects in the repair of double-strand DNA breaks (DSBs) by homologous recombination, but BRCA2's role in this process has been unclear. Here, we present the 3.1 angstrom crystal structure of a approximately 90-kilodalton BRCA2 domain bound to DSS1, which reveals three oligonucleotide-binding (OB) folds and a helix-turn-helix (HTH) motif. We also (i) demonstrate that this BRCA2 domain binds single-stranded DNA, (ii) present its 3.5 angstrom structure bound to oligo(dT)9, (iii) provide data that implicate the HTH motif in dsDNA binding, and (iv) show that BRCA2 stimulates RAD51-mediated recombination in vitro. These findings establish that BRCA2 functions directly in homologous recombination and provide a structural and biochemical basis for understanding the loss of recombination-mediated DSB repair in BRCA2-associated cancers.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yang, Haijuan -- Jeffrey, Philip D -- Miller, Julie -- Kinnucan, Elspeth -- Sun, Yutong -- Thoma, Nicolas H -- Zheng, Ning -- Chen, Phang-Lang -- Lee, Wen-Hwa -- Pavletich, Nikola P -- New York, N.Y. -- Science. 2002 Sep 13;297(5588):1837-48.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology, Sloan-Kettering Division, Joan and Sanford I. Weill Graduate School of Medical Sciences, Cornell University, New York, NY 10021, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12228710" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; BRCA2 Protein/*chemistry/genetics/*metabolism ; Binding Sites ; Crystallography, X-Ray ; DNA/metabolism ; *DNA Repair ; DNA, Single-Stranded/*metabolism ; DNA-Binding Proteins/metabolism ; Genes, BRCA2 ; Helix-Turn-Helix Motifs ; Humans ; Hydrogen Bonding ; Hydrophobic and Hydrophilic Interactions ; Mice ; Molecular Sequence Data ; Mutation ; Proteasome Endopeptidase Complex ; Protein Conformation ; Protein Folding ; Protein Structure, Secondary ; Protein Structure, Tertiary ; Proteins/chemistry/*metabolism ; Rad51 Recombinase ; Rats ; *Recombination, Genetic
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  • 39
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2002-04-06
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Couzin, Jennifer -- New York, N.Y. -- Science. 2002 Apr 5;296(5565):28-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11934996" target="_blank"〉PubMed〈/a〉
    Keywords: Amyloid beta-Peptides/chemistry ; Animals ; Humans ; Mice ; Protein Conformation ; *Protein Folding ; *Protein Structure, Quaternary ; Proteins/*chemistry ; Rats
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  • 40
    Publication Date: 2002-03-02
    Description: The second messenger cyclic adenosine monophosphate (cAMP) is the most important modulator of sympathetic control over cardiac contractility. In cardiac myocytes and many other cell types, however, cAMP transduces the signal generated upon stimulation of various receptors and activates different cellular functions, raising the issue of how specificity can be achieved. In the general field of signal transduction, the view is emerging that specificity is guaranteed by tight localization of signaling events. Here, we show that in neonatal rat cardiac myocytes, beta-adrenergic stimulation generates multiple microdomains with increased concentration of cAMP in correspondence with the region of the transverse tubule/junctional sarcoplasmic reticulum membrane. The restricted pools of cAMP show a range of action as small as approximately 1 micrometer, and free diffusion of the second messenger is limited by the activity of phosphodiesterases. Furthermore, we demonstrate that such gradients of cAMP specifically activate a subset of protein kinase A molecules anchored in proximity to the T tubule.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Zaccolo, Manuela -- Pozzan, Tullio -- TCP00089/Telethon/Italy -- New York, N.Y. -- Science. 2002 Mar 1;295(5560):1711-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biomedical Sciences and Venetian Institute for Molecular Medicine, University of Padua, Via Orus 2, 35129 Padua, Italy. manuela.zaccolo@unipd.it〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11872839" target="_blank"〉PubMed〈/a〉
    Keywords: 1-Methyl-3-isobutylxanthine/pharmacology ; A Kinase Anchor Proteins ; Adaptor Proteins, Signal Transducing ; Animals ; Animals, Newborn ; Cells, Cultured ; Colforsin/pharmacology ; Cyclic AMP/*metabolism ; Cyclic AMP-Dependent Protein Kinases/metabolism ; Fluorescence ; Green Fluorescent Proteins ; Intracellular Membranes/metabolism ; Kinetics ; Luminescent Proteins ; Myocardium/*cytology/*metabolism/ultrastructure ; Norepinephrine/pharmacology ; Phosphodiesterase Inhibitors/pharmacology ; Proto-Oncogene Proteins/pharmacology ; Rats ; Receptors, Adrenergic, beta/*metabolism ; Recombinant Fusion Proteins/metabolism ; Sarcoplasmic Reticulum/*metabolism ; Second Messenger Systems ; Transfection
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  • 41
    Publication Date: 2002-02-02
    Description: The Golgi apparatus is partitioned during mitosis in animal cells by a process of fragmentation, dispersal, and reassembly in each daughter cell. We fractionated the Golgi apparatus in vivo using the drug brefeldin A or a dominant-negative mutant of the Sar1p protein. After these treatments, Golgi enzymes moved back to the endoplasmic reticulum, leaving behind a matrix of Golgi structural proteins. Under these conditions, cells still entered and exited mitosis normally, and their Golgi matrix partitioned in a manner very similar to that of the complete organelle. Thus, the matrix may be the partitioning unit of the Golgi apparatus and may carry the Golgi enzyme-containing membranes into the daughter cells.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Seemann, Joachim -- Pypaert, Marc -- Taguchi, Tomohiko -- Malsam, Jorg -- Warren, Graham -- New York, N.Y. -- Science. 2002 Feb 1;295(5556):848-51.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell Biology, Ludwig Institute for Cancer Research, Yale University School of Medicine, 333 Cedar Street, Post Office Box 208002, New Haven, CT 06520-8002, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11823640" target="_blank"〉PubMed〈/a〉
    Keywords: Anaphase ; Animals ; Autoantigens ; Brefeldin A/pharmacology ; Cell Line ; Endoplasmic Reticulum/enzymology ; Golgi Apparatus/*metabolism/ultrastructure ; HeLa Cells ; Humans ; Interphase ; Intracellular Membranes/metabolism/ultrastructure ; Mannosidases/metabolism ; Membrane Proteins/metabolism ; Metaphase ; Microscopy, Electron ; Microscopy, Fluorescence ; *Mitosis ; Monomeric GTP-Binding Proteins/pharmacology ; N-Acetylglucosaminyltransferases/metabolism ; Protein Disulfide-Isomerases/metabolism ; Rats ; *Saccharomyces cerevisiae Proteins ; Telophase ; Vesicular Transport Proteins
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  • 42
    Publication Date: 2002-03-09
    Description: Time courses of translocation of fluorescently conjugated proteins to the plasma membrane were simultaneously measured in thousands of individual rat basophilic leukemia cells. We found that the C2 domain---a calcium-sensing, lipid-binding protein module that is an essential regulator of protein kinase C and numerous other proteins---targeted proteins to the plasma membrane transiently if calcium was released from internal stores, and persistently in response to entry of extracellular calcium across the plasma membrane. The C2 domain translocation time courses of stimulated cells clustered into only two primary modes. Hence, the reversible recruitment of families of signaling proteins from one cellular compartment to another is a rapid bifurcation mechanism for inducing discrete states of cellular signaling networks.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Teruel, Mary N -- Meyer, Tobias -- CA83229/CA/NCI NIH HHS/ -- GM062144/GM/NIGMS NIH HHS/ -- HG00057/HG/NHGRI NIH HHS/ -- New York, N.Y. -- Science. 2002 Mar 8;295(5561):1910-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular Pharmacology, Stanford University Medical School, 269 Campus Drive, Stanford, CA 94305, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11884760" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Bacterial Proteins ; Calcium/*metabolism ; *Calcium Signaling ; Cell Membrane/*metabolism ; Cytosol/metabolism ; Fluorescence ; Fluorescent Dyes ; Isoenzymes/chemistry/*metabolism ; Kinetics ; Luminescent Proteins ; Platelet Activating Factor/pharmacology ; Protein Binding ; Protein Kinase C/chemistry/*metabolism ; Protein Structure, Tertiary ; *Protein Transport ; Rats ; Receptors, Cell Surface/*metabolism ; Recombinant Fusion Proteins/metabolism ; Software ; Thapsigargin/pharmacology ; Transfection ; Tumor Cells, Cultured
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  • 43
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2002-06-08
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McKerracher, Lisa -- Ellezam, Benjamin -- New York, N.Y. -- Science. 2002 Jun 7;296(5574):1819-20.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Departement de Pathologie et Biologie Cellulaire, Universite de Montreal, 2900 Edouard-Montpetit, Montreal, Quebec, H3T 1J4 Canada. mckerral@patho.umontreal.ca〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12052945" target="_blank"〉PubMed〈/a〉
    Keywords: Amacrine Cells/*physiology ; Animals ; Axonal Transport ; Axons/*physiology ; *Cell Communication ; Cell Differentiation ; Cell Polarity ; Cells, Cultured ; Coculture Techniques ; Dendrites/*physiology ; Embryo, Mammalian ; Nerve Crush ; *Nerve Regeneration ; Optic Nerve/cytology/physiology ; Peripheral Nerves/transplantation ; Rats ; Retinal Ganglion Cells/*physiology ; Signal Transduction ; Spinal Cord/cytology/physiology
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  • 44
    Publication Date: 2002-04-27
    Description: The introduction of biodegradable implant materials as well as minimally invasive surgical procedures in medicine has substantially improved health care within the past few decades. This report describes a group of degradable thermoplastic polymers that are able to change their shape after an increase in temperature. Their shape-memory capability enables bulky implants to be placed in the body through small incisions or to perform complex mechanical deformations automatically. A smart degradable suture was created to illustrate the potential of these shape-memory thermoplastics in biomedical applications.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lendlein, Andreas -- Langer, Robert -- New York, N.Y. -- Science. 2002 May 31;296(5573):1673-6. Epub 2002 Apr 25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉mnemoScience GmbH, Pauwelsstrabetae 19, D-52074 Aachen, Germany. a.lendlein@mnemoscience.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11976407" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Biocompatible Materials/chemical synthesis/chemistry ; Chemistry, Physical ; Dioxanes/chemistry ; Elasticity ; Elastomers ; Isocyanates/chemistry ; Mechanics ; Physicochemical Phenomena ; Polyesters/chemistry ; *Polymers/chemical synthesis/chemistry ; *Prostheses and Implants ; Rats ; Stress, Mechanical ; *Sutures ; Temperature ; Thermodynamics
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  • 45
    Publication Date: 2002-06-18
    Description: The behavior of immature cortical networks in vivo remains largely unknown. Using multisite extracellular and patch-clamp recordings, we observed recurrent bursts of synchronized neuronal activity lasting 0.5 to 3 seconds that occurred spontaneously in the hippocampus of freely moving and anesthetized rat pups. The influence of slow rhythms (0.33 and 0.1 hertz) and the contribution of both gamma-aminobutyric acid A-mediated and glutamate receptor-mediated synaptic signals in the generation of hippocampal bursts was reminiscent of giant depolarizing potentials observed in vitro. This earliest pattern, which diversifies during the second postnatal week, could provide correlated activity for immature neurons and may underlie activity-dependent maturation of the hippocampal network.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Leinekugel, Xavier -- Khazipov, Rustem -- Cannon, Robert -- Hirase, Hajime -- Ben-Ari, Yehezkel -- Buzsaki, Gyorgy -- FO6 TW02290/TW/FIC NIH HHS/ -- N0T 43994/PHS HHS/ -- NS 34994/NS/NINDS NIH HHS/ -- NS 43157/NS/NINDS NIH HHS/ -- RR09754/RR/NCRR NIH HHS/ -- New York, N.Y. -- Science. 2002 Jun 14;296(5575):2049-52.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉INMED, Institut National de la Sante et de la Recherche Medicale (INSERM) U29, Avenue de Luminy, Boite Postale 13, 13273 Marseille Cedex 09, France.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12065842" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Newborn ; Evoked Potentials ; Hippocampus/*physiology ; Neurons/*physiology ; Patch-Clamp Techniques ; Pyramidal Cells/physiology ; Rats ; Rats, Wistar ; Receptors, GABA-A/physiology ; Receptors, Glutamate/physiology ; Synapses/physiology ; Synaptic Transmission ; gamma-Aminobutyric Acid/physiology
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  • 46
    Publication Date: 2002-09-28
    Description: Unc104/KIF1A belongs to a class of monomeric kinesin motors that have been thought to possess an unusual motility mechanism. Unlike the unidirectional motion driven by the coordinated actions of the two heads in conventional kinesins, single-headed KIF1A was reported to undergo biased diffusional motion along microtubules. Here, we show that Unc104/KIF1A can dimerize and move unidirectionally and processively with rapid velocities characteristic of transport in living cells. These results suggest that Unc104/KIF1A operates in vivo by a mechanism similar to conventional kinesin and that regulation of motor dimerization may be used to control transport by this class of kinesins.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tomishige, Michio -- Klopfenstein, Dieter R -- Vale, Ronald D -- AR42895/AR/NIAMS NIH HHS/ -- New York, N.Y. -- Science. 2002 Sep 27;297(5590):2263-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉The Howard Hughes Medical Institute and the Department of Cellular and Molecular Pharmacology, University of California, San Francisco, CA 94143, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12351789" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Caenorhabditis elegans ; Caenorhabditis elegans Proteins/chemistry/physiology ; Diffusion ; Dimerization ; Humans ; Kinesin/*chemistry/physiology ; Liposomes ; Microtubules/*physiology ; Molecular Motor Proteins/*chemistry/*physiology ; Molecular Sequence Data ; Movement ; Mutation ; Nerve Tissue Proteins/*chemistry/*physiology ; Protein Structure, Tertiary ; Rats ; Recombinant Fusion Proteins/chemistry
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  • 47
    Publication Date: 2002-01-05
    Description: Hippocampal mossy fiber long-term potentiation (LTP) is expressed presynaptically, but the exact mechanisms remain unknown. Here, we demonstrate the involvement of the hyperpolarization-activated cation channel (Ih) in the expression of mossy fiber LTP. Established LTP was blocked and reversed by Ih channel antagonists. Whole-cell recording from granule cells revealed that repetitive stimulation causes a calcium- and Ih-dependent long-lasting depolarization mediated by protein kinase A. Depolarization at the terminals would be expected to enhance transmitter release, whereas somatic depolarization would enhance the responsiveness of granule cells to afferent input. Thus, Ih channels play an important role in the long-lasting control of transmitter release and neuronal excitability.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mellor, Jack -- Nicoll, Roger A -- Schmitz, Dietmar -- New York, N.Y. -- Science. 2002 Jan 4;295(5552):143-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cellular and Molecular Pharmacology, University of California, San Francisco, CA 94143, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11778053" target="_blank"〉PubMed〈/a〉
    Keywords: Adenylyl Cyclases/metabolism ; Animals ; Benzazepines/pharmacology ; Calcium/metabolism ; Cesium/pharmacology ; Chlorides/pharmacology ; Colforsin/pharmacology ; Cyclic AMP/metabolism ; Cyclic AMP-Dependent Protein Kinases/antagonists & inhibitors/metabolism ; Cyclic Nucleotide-Gated Cation Channels ; Dentate Gyrus/cytology/drug effects/physiology ; Hyperpolarization-Activated Cyclic Nucleotide-Gated Channels ; In Vitro Techniques ; Ion Channels/antagonists & inhibitors/*physiology ; Isoquinolines/pharmacology ; Long-Term Potentiation/drug effects/*physiology ; Membrane Potentials ; *Membrane Proteins ; Models, Neurological ; Mossy Fibers, Hippocampal/drug effects/*physiology ; *Nerve Tissue Proteins ; Patch-Clamp Techniques ; Potassium/pharmacology ; Potassium Channels ; Presynaptic Terminals/*physiology ; Pyramidal Cells/drug effects/physiology ; Pyrimidines/pharmacology ; Rats ; Rats, Sprague-Dawley ; *Sulfonamides ; Synaptic Transmission
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  • 48
    Publication Date: 2002-06-01
    Description: A key issue in signal transduction is how signaling pathways common to many systems-so-called canonical signaling cassettes-integrate signals from molecules having a wide spectrum of activities, such as hormones and neurotrophins, to deliver distinct biological outcomes. The neuroendocrine cell line PC12, derived from rat pheochromocytoma, provides an example of how one canonical signaling cassette-the Raf --〉 mitogen-activated protein kinase kinase (MEK) --〉 extracellular signal-regulated kinase (ERK) pathway-can promote distinct outcomes, which in this case include neuritogenesis, gene induction, and proliferation. Two growth hormones, epidermal growth factor (EGF) and nerve growth factor (NGF), use the same pathway to cause PC12 proliferation and differentiation, respectively. In addition, pituitary adenylate cyclase-activating polypeptide (PACAP), a neurotransmitter that also causes differentiation, uses the same canonical cassette as NGF but in a different way. The Connections Map for PC12 Cell Differentiation brings into focus the complex array of specific cellular responses that rely on canonical signal transduction systems.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vaudry, D -- Stork, P J S -- Lazarovici, P -- Eiden, L E -- New York, N.Y. -- Science. 2002 May 31;296(5573):1648-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Section on Molecular Neuroscience, Laboratory of Cellular and Molecular Regulation, National Institute of Mental Health, Bethesda, MD 20892, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12040181" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Cell Differentiation ; Cell Division ; Cyclic AMP/metabolism ; Epidermal Growth Factor/metabolism/pharmacology ; *MAP Kinase Signaling System ; Mitogen-Activated Protein Kinases/metabolism ; Models, Biological ; Nerve Growth Factor/metabolism/pharmacology ; Neurites/physiology ; Neuropeptides/metabolism/pharmacology ; PC12 Cells/*physiology ; Pituitary Adenylate Cyclase-Activating Polypeptide ; Rats ; Receptor, trkA/metabolism ; Receptors, Cell Surface/metabolism ; Response Elements ; Transcription, Genetic
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  • 49
    Publication Date: 2002-11-09
    Description: In young animals, monocular deprivation leads to an ocular dominance shift, whereas in adults after the critical period there is no such shift. Chondroitin sulphate proteoglycans (CSPGs) are components of the extracellular matrix (ECM) inhibitory for axonal sprouting. We tested whether the developmental maturation of the ECM is inhibitory for experience-dependent plasticity in the visual cortex. The organization of CSPGs into perineuronal nets coincided with the end of the critical period and was delayed by dark rearing. After CSPG degradation with chondroitinase-ABC in adult rats, monocular deprivation caused an ocular dominance shift toward the nondeprived eye. The mature ECM is thus inhibitory for experience-dependent plasticity, and degradation of CSPGs reactivates cortical plasticity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pizzorusso, Tommaso -- Medini, Paolo -- Berardi, Nicoletta -- Chierzi, Sabrina -- Fawcett, James W -- Maffei, Lamberto -- New York, N.Y. -- Science. 2002 Nov 8;298(5596):1248-51.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Scuola Normale Superiore, 56100 Pisa, Italy. tommaso@in.pi.cnr.it〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12424383" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Axons/physiology ; Chondroitin ABC Lyase/*metabolism ; Chondroitin Sulfate Proteoglycans/*metabolism ; Darkness ; *Dominance, Ocular ; Extracellular Matrix/*metabolism ; Extracellular Matrix Proteins/metabolism ; Glycosaminoglycans/metabolism ; Lectins, C-Type ; Light ; Nerve Tissue Proteins/metabolism ; *Neuronal Plasticity ; Neurons/physiology ; Rats ; Synapses/physiology ; Time Factors ; Visual Acuity ; Visual Cortex/*physiology
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  • 50
    Publication Date: 2002-09-28
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Snow, Melanie -- Cox, Shae-Lee -- Jenkin, Graham -- Trounson, Alan -- Shaw, Jillian -- New York, N.Y. -- Science. 2002 Sep 27;297(5590):2227.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology, Monash University, Victoria, Australia, 3800.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12351780" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Embryo Loss ; Embryo Transfer ; Embryonic and Fetal Development ; Female ; Fertility ; Fertilization in Vitro ; Gonadotropins, Equine/administration & dosage ; Male ; Mice ; Mice, Inbred Strains ; Mice, Nude ; Oocytes/*physiology ; Ovariectomy ; Ovary/*transplantation ; Pregnancy ; Pregnancy Outcome ; Rats ; *Reproductive Techniques, Assisted ; *Transplantation, Heterologous
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  • 51
    Publication Date: 2000-01-05
    Description: Mutations in copper, zinc superoxide dismutase (SOD) have been implicated in the selective death of motor neurons in 2 percent of amyotrophic lateral sclerosis (ALS) patients. The loss of zinc from either wild-type or ALS-mutant SODs was sufficient to induce apoptosis in cultured motor neurons. Toxicity required that copper be bound to SOD and depended on endogenous production of nitric oxide. When replete with zinc, neither ALS-mutant nor wild-type copper, zinc SODs were toxic, and both protected motor neurons from trophic factor withdrawal. Thus, zinc-deficient SOD may participate in both sporadic and familial ALS by an oxidative mechanism involving nitric oxide.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Estevez, A G -- Crow, J P -- Sampson, J B -- Reiter, C -- Zhuang, Y -- Richardson, G J -- Tarpey, M M -- Barbeito, L -- Beckman, J S -- R01 HL58209/HL/NHLBI NIH HHS/ -- R01 NS33291/NS/NINDS NIH HHS/ -- R01 NS36761/NS/NINDS NIH HHS/ -- etc. -- New York, N.Y. -- Science. 1999 Dec 24;286(5449):2498-500.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Anesthesiology, University of Alabama at Birmingham, Birmingham, AL 35233, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10617463" target="_blank"〉PubMed〈/a〉
    Keywords: Amyotrophic Lateral Sclerosis/drug therapy/*enzymology/genetics/pathology ; Animals ; *Apoptosis ; Brain-Derived Neurotrophic Factor/pharmacology ; Cells, Cultured ; Chelating Agents/pharmacology ; Copper/metabolism ; Fluoresceins/metabolism ; Liposomes ; Motor Neurons/*cytology/metabolism ; Mutation ; Nitrates/metabolism ; Nitric Oxide/*metabolism ; Nitric Oxide Synthase/antagonists & inhibitors/metabolism ; Nitric Oxide Synthase Type I ; Oxidation-Reduction ; Rats ; Superoxide Dismutase/chemistry/genetics/*metabolism/toxicity ; Superoxides/metabolism ; Zinc/*metabolism
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  • 52
    Publication Date: 2000-02-26
    Description: Because of a critical shortage in suitable organs, many patients with terminal liver disease die each year before liver transplantation can be performed. Transplantation of isolated hepatocytes has been proposed for the temporary metabolic support of patients awaiting liver transplantation or spontaneous reversion of their liver disease. A major limitation of this form of therapy is the present inability to isolate an adequate number of transplantable hepatocytes. A highly differentiated cell line, NKNT-3, was generated by retroviral transfer in normal primary adult human hepatocytes of an immortalizing gene that can be subsequently and completely excised by Cre/Lox site-specific recombination. When transplanted into the spleen of rats under transient immunosuppression, reversibly immortalized NKNT-3 cells provided life-saving metabolic support during acute liver failure induced by 90% hepatectomy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kobayashi, N -- Fujiwara, T -- Westerman, K A -- Inoue, Y -- Sakaguchi, M -- Noguchi, H -- Miyazaki, M -- Cai, J -- Tanaka, N -- Fox, I J -- Leboulch, P -- DK48794/DK/NIDDK NIH HHS/ -- HL55435/HL/NHLBI NIH HHS/ -- New York, N.Y. -- Science. 2000 Feb 18;287(5456):1258-62.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉First Department of Surgery and Department of Cell Biology, Okayama University Medical School, 2-5-1 Shikata-cho, Okayama 700-8558, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10678831" target="_blank"〉PubMed〈/a〉
    Keywords: Adult ; Animals ; Antigens, Polyomavirus Transforming/genetics ; Cell Culture Techniques/*methods ; Cell Differentiation ; Cell Line ; *Cell Transplantation ; Gene Expression ; Genetic Vectors ; Hepatectomy ; Humans ; Integrases/metabolism ; Liver/*cytology/metabolism/pathology ; Liver Failure, Acute/metabolism/pathology/*prevention & control/therapy ; Liver Regeneration ; Mice ; Mice, SCID ; Rats ; Retroviridae/genetics ; Spleen/cytology ; Transfection ; *Viral Proteins
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  • 53
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-02-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Plous, S -- Herzog, H A -- New York, N.Y. -- Science. 2000 Oct 27;290(5492):711.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11184195" target="_blank"〉PubMed〈/a〉
    Keywords: Animal Welfare/*legislation & jurisprudence ; Animals ; *Animals, Laboratory ; Birds ; Mice ; Rats ; *Research Personnel ; Surveys and Questionnaires ; United States ; United States Department of Agriculture/legislation & jurisprudence
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  • 54
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    Unknown
    American Association for the Advancement of Science (AAAS)
    Publication Date: 2000-02-05
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Miles, R -- New York, N.Y. -- Science. 2000 Jan 14;287(5451):244-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratoire de Neurobiologie Cellulaire, INSERM, Institut Pasteur, Paris, France. miles@pasteur.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10660424" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Animals ; Axons/physiology/ultrastructure ; Brain/cytology/*physiology ; Dendrites/physiology/ultrastructure ; Evoked Potentials ; Gap Junctions/physiology ; Interneurons/*cytology/*physiology ; *Neural Inhibition ; Neurotransmitter Agents/metabolism ; Pyramidal Cells/physiology ; Rats ; Sodium Channels/physiology ; Synapses/*physiology ; *Synaptic Transmission
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  • 55
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2000-09-08
    Description: During animal development, cells become progressively more restricted in the cell types to which they can give rise. In the central nervous system (CNS), for example, multipotential stem cells produce various kinds of specified precursors that divide a limited number of times before they terminally differentiate into either neurons or glial cells. We show here that certain extracellular signals can induce oligodendrocyte precursor cells to revert to multipotential neural stem cells, which can self-renew and give rise to neurons and astrocytes, as well as to oligodendrocytes. Thus, these precursor cells have greater developmental potential than previously thought.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kondo, T -- Raff, M -- New York, N.Y. -- Science. 2000 Sep 8;289(5485):1754-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Medical Research Council Developmental Neurobiology Programme, MRC Laboratory for Molecular Cell Biology and the Biology Department, University College London, London WC1E 6BT, UK. t.kondo@ucl.ac.uk〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10976069" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Newborn ; Astrocytes/chemistry/*cytology ; Blood ; Bone Morphogenetic Proteins/pharmacology ; Cell Culture Techniques ; *Cell Differentiation ; Cells, Cultured ; Culture Media ; Culture Media, Serum-Free ; Fibroblast Growth Factor 2/pharmacology ; Galactosylceramides/analysis ; Glial Fibrillary Acidic Protein/analysis ; Glutamate Decarboxylase/biosynthesis/genetics ; Isoenzymes/biosynthesis/genetics ; Neurofilament Proteins/analysis/biosynthesis ; Neurons/chemistry/*cytology ; Oligodendroglia/chemistry/*cytology ; Optic Nerve/cytology ; Platelet-Derived Growth Factor/pharmacology ; Rats ; Stem Cells/chemistry/*cytology ; Thyroid Hormones/pharmacology
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  • 56
    Publication Date: 2000-10-06
    Description: The signal transducers and activators of transcription (STAT) transcription factors become phosphorylated on tyrosine and translocate to the nucleus after stimulation of cells with growth factors or cytokines. We show that the Rac1 guanosine triphosphatase can bind to and regulate STAT3 activity. Dominant negative Rac1 inhibited STAT3 activation by growth factors, whereas activated Rac1 stimulated STAT3 phosphorylation on both tyrosine and serine residues. Moreover, activated Rac1 formed a complex with STAT3 in mammalian cells. Yeast two-hybrid analysis indicated that STAT3 binds directly to active but not inactive Rac1 and that the interaction occurs via the effector domain. Rac1 may serve as an alternate mechanism for targeting STAT3 to tyrosine kinase signaling complexes.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Simon, A R -- Vikis, H G -- Stewart, S -- Fanburg, B L -- Cochran, B H -- Guan, K L -- GM-54304/GM/NIGMS NIH HHS/ -- K08-HL-03547/HL/NHLBI NIH HHS/ -- P30-DK34928/DK/NIDDK NIH HHS/ -- etc. -- New York, N.Y. -- Science. 2000 Oct 6;290(5489):144-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Pulmonary and Critical Care Division, Tupper Research Institute, New England Medical Center, Boston, MA 02111, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11021801" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Substitution ; Animals ; COS Cells ; Cell Line ; Cercopithecus aethiops ; DNA-Binding Proteins/genetics/*metabolism ; Enzyme Activation ; Epidermal Growth Factor/pharmacology ; Gene Expression Regulation ; Genes, Reporter ; Genetic Vectors ; Guanine Nucleotide Exchange Factors/genetics/metabolism ; Humans ; Janus Kinase 2 ; Mutation ; Neoplasm Proteins ; Phosphorylation ; Phosphoserine/metabolism ; Phosphotyrosine/metabolism ; Protein-Tyrosine Kinases/metabolism ; Proteins/genetics/metabolism ; *Proto-Oncogene Proteins ; Rats ; STAT3 Transcription Factor ; Signal Transduction ; Trans-Activators/genetics/*metabolism ; Transfection ; Two-Hybrid System Techniques ; rac1 GTP-Binding Protein/genetics/*metabolism
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  • 57
    Publication Date: 2000-10-06
    Description: Neuropathic pain arises as a debilitating consequence of nerve injury. The etiology of such pain is poorly understood, and existing treatment is largely ineffective. We demonstrate here that glial cell line-derived neurotrophic factor (GDNF) both prevented and reversed sensory abnormalities that developed in neuropathic pain models, without affecting pain-related behavior in normal animals. GDNF reduces ectopic discharges within sensory neurons after nerve injury. This may arise as a consequence of the reversal by GDNF of the injury-induced plasticity of several sodium channel subunits. Together these findings provide a rational basis for the use of GDNF as a therapeutic treatment for neuropathic pain states.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Boucher, T J -- Okuse, K -- Bennett, D L -- Munson, J B -- Wood, J N -- McMahon, S B -- New York, N.Y. -- Science. 2000 Oct 6;290(5489):124-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Centre for Neuroscience Research, King's College London, London SE1 7EH, UK.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11021795" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials/drug effects ; Analgesics, Non-Narcotic/pharmacology/*therapeutic use ; Animals ; Ganglia, Spinal/physiopathology ; Glial Cell Line-Derived Neurotrophic Factor ; Hot Temperature ; Hyperalgesia/*drug therapy ; Ligation ; Nerve Fibers/drug effects/physiology ; Nerve Fibers, Myelinated/drug effects/physiology ; *Nerve Growth Factors ; Nerve Tissue Proteins/pharmacology/*therapeutic use ; Neural Conduction/drug effects ; Neurons, Afferent/drug effects/physiology ; Pain/*drug therapy ; Pain Threshold/drug effects ; Peripheral Nervous System Diseases/*physiopathology ; Rats ; Reverse Transcriptase Polymerase Chain Reaction ; Sciatic Nerve ; Sodium Channels/genetics/metabolism ; Spinal Nerves ; Touch
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  • 58
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-02-24
    Description: Work presented last week at the annual meeting of the American Society for Cell Biology in San Francisco suggests that applying a harmless bacterium or its products to surgical wounds may thwart infections by the dangerous pathogen Staphylococcus aureus, a major cause of hospital-acquired infections. Although physicians have previously pitted one bacterium against another to prevent infections of the intestinal and genitourinary tracts, this is the first attempt to use a friendly microbe to prevent infection of surgical wounds, say experts. The findings also point to a possible mechanism for this "bacterial interference." They suggest that a protein secreted by the harmless bacterium prevents the pathogen from getting a foothold in injured tissue.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Strauss, E -- New York, N.Y. -- Science. 2000 Dec 22;290(5500):2231-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11188710" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Antibiosis ; Bacterial Adhesion ; Binding Sites ; Lactobacillus/*physiology ; Rats ; Staphylococcal Infections/*prevention & control ; Staphylococcus aureus/*physiology ; Surgical Wound Infection/*prevention & control
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  • 59
    Publication Date: 2001-02-07
    Description: Somatostatin and dopamine are two major neurotransmitter systems that share a number of structural and functional characteristics. Somatostatin receptors and dopamine receptors are colocalized in neuronal subgroups, and somatostatin is involved in modulating dopamine-mediated control of motor activity. However, the molecular basis for such interaction between the two systems is unclear. Here, we show that dopamine receptor D2R and somatostatin receptor SSTR5 interact physically through hetero-oligomerization to create a novel receptor with enhanced functional activity. Our results provide evidence that receptors from different G protein (heterotrimeric guanine nucleotide binding protein)-coupled receptor families interact through oligomerization. Such direct intramembrane association defines a new level of molecular crosstalk between related G protein-coupled receptor subfamilies.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Rocheville, M -- Lange, D C -- Kumar, U -- Patel, S C -- Patel, R C -- Patel, Y C -- NS32160-05/NS/NINDS NIH HHS/ -- NS34339/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2000 Apr 7;288(5463):154-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Fraser Laboratories, Department of Medicine, McGill University and Royal Victoria Hospital, Montreal, Quebec H3A 1A1, Canada.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10753124" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; CHO Cells ; Cell Membrane/metabolism ; Cerebral Cortex/metabolism ; Colforsin/pharmacology ; Corpus Striatum/metabolism ; Cricetinae ; Cyclic AMP/metabolism ; Dimerization ; Dopamine D2 Receptor Antagonists ; Guanosine 5'-O-(3-Thiotriphosphate)/pharmacology ; Heterotrimeric GTP-Binding Proteins/metabolism ; Humans ; Ligands ; Male ; Neurons/metabolism ; Pyramidal Cells/metabolism ; Quinpirole/pharmacology ; Rats ; *Receptor Cross-Talk ; Receptors, Dopamine D2/agonists/genetics/*metabolism ; Receptors, Somatostatin/agonists/antagonists & inhibitors/genetics/*metabolism ; Somatostatin/metabolism/pharmacology ; Spiperone/pharmacology ; Sulpiride/pharmacology ; Transfection
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  • 60
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2000-01-29
    Description: Proteins capable of self-perpetuating changes in conformation and function (known as prions) can serve as genetic elements. To test whether novel prions could be created by recombinant methods, a yeast prion determinant was fused to the rat glucocorticoid receptor. The fusion protein existed in different heritable functional states, switched between states at a low spontaneous rate, and could be induced to switch by experimental manipulations. The complete change in phenotype achieved by transferring a prion determinant from one protein to another confirms the protein-only nature of prion inheritance and establishes a mechanism for engineering heritable changes in phenotype that should be broadly applicable.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Li, L -- Lindquist, S -- New York, N.Y. -- Science. 2000 Jan 28;287(5453):661-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute, Department of Molecular Genetics and Cell Biology, University of Chicago, 5841 South Maryland Avenue MC1028, Chicago, IL 60637, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10650001" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Fungal Proteins/*chemistry/genetics/*metabolism ; Genes, Reporter ; Guanidine/pharmacology ; Heat-Shock Proteins/pharmacology ; Peptide Termination Factors ; Phenotype ; Prions/*chemistry/genetics/*metabolism ; Rats ; Receptors, Glucocorticoid/chemistry/genetics/metabolism ; Recombinant Fusion Proteins/chemistry/metabolism ; Saccharomyces cerevisiae/chemistry/genetics ; *Saccharomyces cerevisiae Proteins ; Transcription, Genetic ; Transformation, Genetic
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  • 61
    Publication Date: 2000-07-21
    Description: Guanosine 5'-triphosphate (GTP)-binding proteins (G proteins) are involved in exocytosis, endocytosis, and recycling of vesicles in yeast and mammalian secretory cells. However, little is known about their contribution to fast synaptic transmission. We loaded guanine nucleotide analogs directly into a giant nerve terminal in rat brainstem slices. Inhibition of G-protein activity had no effect on basal synaptic transmission, but augmented synaptic depression and significantly slowed recovery from depression. A nonhydrolyzable GTP analog blocked recovery of transmission from activity-dependent depression. Neither effect was accompanied by a change in presynaptic calcium currents. Thus, G proteins contribute to fast synaptic transmission by refilling synaptic vesicles depleted after massive exocytosis.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Takahashi, T -- Hori, T -- Kajikawa, Y -- Tsujimoto, T -- New York, N.Y. -- Science. 2000 Jul 21;289(5478):460-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurophysiology, University of Tokyo Faculty of Medicine, Tokyo 113-0033, Japan. ttakahas-tky@umin.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10903208" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Animals ; Brain Stem/metabolism ; Calcium/metabolism ; Excitatory Postsynaptic Potentials ; Exocytosis ; GTP-Binding Proteins/*physiology ; Guanosine 5'-O-(3-Thiotriphosphate)/pharmacology ; Guanosine Diphosphate/*analogs & derivatives/pharmacology ; Guanosine Triphosphate/metabolism ; In Vitro Techniques ; Patch-Clamp Techniques ; Presynaptic Terminals/metabolism ; Rats ; Rats, Wistar ; *Synaptic Transmission ; Synaptic Vesicles/*metabolism ; Thionucleotides/pharmacology
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  • 62
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2000-08-12
    Description: The life-span of sperm may be short but it is certainly busy. The three principal molecular events that prepare sperm for fertilization are all controlled by the intracellular nucleotide adenosine 3',5'-monophosphate (cAMP). One of these, capacitation, is also regulated by bicarbonate ions. The elusive connection between cAMP and bicarbonate ions now appears to be solved as Kaupp and Weyand explain in their Perspective. Bicarbonate ions enter sperm through the anion transporter in the sperm plasma membrane and activate the soluble form of adenylyl cyclase, the enzyme that synthesizes cAMP (Chen et al.)〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaupp, U B -- Weyand, I -- New York, N.Y. -- Science. 2000 Jul 28;289(5479):559-60.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Biologische Informationsverarbeitung, Forschungszentrum Jlich, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10939966" target="_blank"〉PubMed〈/a〉
    Keywords: Adenylyl Cyclases/chemistry/*metabolism ; Animals ; Bicarbonates/*metabolism/pharmacology ; Calcium Channels/metabolism ; Catalytic Domain ; Cyclic AMP/*metabolism ; Cyclic Nucleotide-Gated Cation Channels ; Enzyme Activation ; Humans ; Hyperpolarization-Activated Cyclic Nucleotide-Gated Channels ; Ion Channels/metabolism ; Male ; Molecular Weight ; *Muscle Proteins ; Potassium Channels ; Rats ; Signal Transduction ; Solubility ; *Sperm Capacitation ; Sperm Motility ; Sperm Tail/physiology ; Spermatozoa/metabolism/*physiology
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  • 63
    Publication Date: 2000-08-19
    Description: The adenomatous polyposis coli gene (APC) is mutated in familial adenomatous polyposis and in sporadic colorectal tumors. Here the APC gene product is shown to bind through its armadillo repeat domain to a Rac-specific guanine nucleotide exchange factor (GEF), termed Asef. Endogenous APC colocalized with Asef in mouse colon epithelial cells and neuronal cells. Furthermore, APC enhanced the GEF activity of Asef and stimulated Asef-mediated cell flattening, membrane ruffling, and lamellipodia formation in MDCK cells. These results suggest that the APC-Asef complex may regulate the actin cytoskeletal network, cell morphology and migration, and neuronal function.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kawasaki, Y -- Senda, T -- Ishidate, T -- Koyama, R -- Morishita, T -- Iwayama, Y -- Higuchi, O -- Akiyama, T -- New York, N.Y. -- Science. 2000 Aug 18;289(5482):1194-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Molecular and Genetic Information, Institute for Molecular and Cellular Biosciences, University of Tokyo, 1-1-1 Yayoi, Bunkyo-ku, Tokyo 113, Japan.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10947987" target="_blank"〉PubMed〈/a〉
    Keywords: Adenomatous Polyposis Coli Protein ; Amino Acid Sequence ; Animals ; Brain/metabolism ; Cell Line ; Cell Membrane/ultrastructure ; Cell Size ; Colon/cytology/metabolism ; Cytoplasm/metabolism ; Cytoskeletal Proteins/*metabolism ; Guanine Nucleotide Exchange Factors/chemistry/genetics/*metabolism ; Guanosine Diphosphate/metabolism ; Humans ; Immunoblotting ; Intestinal Mucosa/cytology/metabolism ; Mice ; Molecular Sequence Data ; Neurons/metabolism ; Precipitin Tests ; Protein Binding ; Protein Structure, Tertiary ; Rats ; Recombinant Fusion Proteins/metabolism ; Rho Guanine Nucleotide Exchange Factors ; Signal Transduction ; *Trans-Activators ; Transfection ; Two-Hybrid System Techniques ; beta Catenin ; rac GTP-Binding Proteins/*metabolism
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  • 64
    Publication Date: 2000-07-07
    Description: The structure of the cytoplasmic assembly of voltage-dependent K+ channels was solved by x-ray crystallography at 2.1 angstrom resolution. The assembly includes the cytoplasmic (T1) domain of the integral membrane alpha subunit together with the oxidoreductase beta subunit in a fourfold symmetric T1(4)beta4 complex. An electrophysiological assay showed that this complex is oriented with four T1 domains facing the transmembrane pore and four beta subunits facing the cytoplasm. The transmembrane pore communicates with the cytoplasm through lateral, negatively charged openings above the T1(4)beta4 complex. The inactivation peptides of voltage-dependent K(+) channels reach their site of action by entering these openings.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gulbis, J M -- Zhou, M -- Mann, S -- MacKinnon, R -- GM47400/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2000 Jul 7;289(5476):123-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Howard Hughes Medical Institute and Laboratory of Molecular Neurobiology and Biophysics, The Rockefeller University, 1230 York Avenue, New York, NY 10021, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10884227" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Crystallography, X-Ray ; Cytoplasm/chemistry ; Kv1.1 Potassium Channel ; Kv1.4 Potassium Channel ; Macromolecular Substances ; Models, Molecular ; Mutation ; Oocytes ; Oxidoreductases/chemistry/metabolism ; Patch-Clamp Techniques ; Peptides/metabolism ; Potassium Channels/*chemistry/genetics/*metabolism ; *Potassium Channels, Voltage-Gated ; Protein Conformation ; Protein Structure, Quaternary ; Protein Structure, Tertiary ; Rats ; Recombinant Fusion Proteins/chemistry/metabolism ; Xenopus
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  • 65
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2000-01-15
    Description: A puzzling feature of the neocortex is the rich array of inhibitory interneurons. Multiple neuron recordings revealed numerous electrophysiological-anatomical subclasses of neocortical gamma-aminobutyric acid-ergic (GABAergic) interneurons and three types of GABAergic synapses. The type of synapse used by each interneuron to influence its neighbors follows three functional organizing principles. These principles suggest that inhibitory synapses could shape the impact of different interneurons according to their specific spatiotemporal patterns of activity and that GABAergic interneuron and synapse diversity may enable combinatorial inhibitory effects in the neocortex.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gupta, A -- Wang, Y -- Markram, H -- New York, N.Y. -- Science. 2000 Jan 14;287(5451):273-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurobiology, The Weizmann Institute for Science, 76100 Rehovot, Israel.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10634775" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Animals ; Dendrites/physiology/ultrastructure ; In Vitro Techniques ; Interneurons/cytology/*physiology ; Neocortex/*cytology/physiology ; *Neural Inhibition ; Patch-Clamp Techniques ; Potassium/metabolism ; Pyramidal Cells/cytology/physiology ; Rats ; Rats, Wistar ; Somatosensory Cortex/cytology/physiology ; Synapses/*physiology ; *Synaptic Transmission ; gamma-Aminobutyric Acid/*physiology
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 66
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-02-24
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Malakoff, D -- New York, N.Y. -- Science. 2000 Oct 13;290(5490):243-5.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11183366" target="_blank"〉PubMed〈/a〉
    Keywords: Animal Welfare/*legislation & jurisprudence ; Animals ; *Animals, Laboratory ; Birds ; Mice ; Rats ; Research/*legislation & jurisprudence/standards ; United States ; United States Department of Agriculture/legislation & jurisprudence
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  • 67
    Publication Date: 2000-01-29
    Description: Malfolded proteins in the endoplasmic reticulum (ER) induce cellular stress and activate c-Jun amino-terminal kinases (JNKs or SAPKs). Mammalian homologs of yeast IRE1, which activate chaperone genes in response to ER stress, also activated JNK, and IRE1alpha-/- fibroblasts were impaired in JNK activation by ER stress. The cytoplasmic part of IRE1 bound TRAF2, an adaptor protein that couples plasma membrane receptors to JNK activation. Dominant-negative TRAF2 inhibited activation of JNK by IRE1. Activation of JNK by endogenous signals initiated in the ER proceeds by a pathway similar to that initiated by cell surface receptors in response to extracellular signals.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Urano, F -- Wang, X -- Bertolotti, A -- Zhang, Y -- Chung, P -- Harding, H P -- Ron, D -- DK47119/DK/NIDDK NIH HHS/ -- ES08681/ES/NIEHS NIH HHS/ -- New York, N.Y. -- Science. 2000 Jan 28;287(5453):664-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Skirball Institute of Biomolecular Medicine, Departments of Medicine, Cell Biology and the Kaplan Cancer Center, New York University Medical School, New York, NY 10016, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10650002" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Cell Line ; Cells, Cultured ; Endoplasmic Reticulum/*metabolism ; Endoribonucleases/genetics/*metabolism ; Enzyme Activation ; Gene Targeting ; Humans ; JNK Mitogen-Activated Protein Kinases ; *Membrane Proteins ; Mitogen-Activated Protein Kinases/*metabolism ; Multienzyme Complexes/genetics/*metabolism ; Protein Kinases/genetics/*metabolism ; Protein-Serine-Threonine Kinases/genetics/*metabolism ; Proteins/chemistry/genetics/*metabolism ; Rats ; Recombinant Fusion Proteins/metabolism ; TNF Receptor-Associated Factor 2 ; Thapsigargin/pharmacology ; Two-Hybrid System Techniques ; eIF-2 Kinase/metabolism
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  • 68
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2000-09-23
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Vogel, G -- New York, N.Y. -- Science. 2000 Sep 8;289(5485):1666.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11001723" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Newborn ; Blood ; Cell Culture Techniques ; *Cell Differentiation ; Cells, Cultured ; Culture Media ; Fibroblast Growth Factors/pharmacology ; Neurons/*cytology ; Oligodendroglia/*cytology ; Rats ; Stem Cells/*cytology
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  • 69
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-03-17
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Strauss, E -- New York, N.Y. -- Science. 2001 Mar 2;291(5509):1689-90.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11253187" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Brain/*cytology ; Cell Differentiation ; Dopamine/biosynthesis ; Embryo, Mammalian/*cytology ; Humans ; Mice ; Neurons/*cytology/enzymology ; Parkinson Disease/therapy ; Rats ; *Stem Cell Transplantation ; Stem Cells/*cytology
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  • 70
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-03-21
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Wuethrich, B -- New York, N.Y. -- Science. 2001 Mar 16;291(5511):2077-9.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11256400" target="_blank"〉PubMed〈/a〉
    Keywords: Alcoholism/*complications/metabolism/pathology ; Animals ; Brain/metabolism/*pathology ; Brain Damage, Chronic/*etiology/metabolism/pathology ; Cerebrospinal Fluid ; Ethanol/*adverse effects/pharmacology ; Female ; Humans ; Hydrocortisone/metabolism ; Magnetic Resonance Imaging ; Male ; Neurons/metabolism/pathology ; Rats ; Receptors, GABA-A/metabolism ; Receptors, N-Methyl-D-Aspartate/metabolism ; *Sex Characteristics ; Spermidine/metabolism
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  • 71
    Publication Date: 2001-10-27
    Description: Skeletal muscle adapts to decreases in activity and load by undergoing atrophy. To identify candidate molecular mediators of muscle atrophy, we performed transcript profiling. Although many genes were up-regulated in a single rat model of atrophy, only a small subset was universal in all atrophy models. Two of these genes encode ubiquitin ligases: Muscle RING Finger 1 (MuRF1), and a gene we designate Muscle Atrophy F-box (MAFbx), the latter being a member of the SCF family of E3 ubiquitin ligases. Overexpression of MAFbx in myotubes produced atrophy, whereas mice deficient in either MAFbx or MuRF1 were found to be resistant to atrophy. These proteins are potential drug targets for the treatment of muscle atrophy.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bodine, S C -- Latres, E -- Baumhueter, S -- Lai, V K -- Nunez, L -- Clarke, B A -- Poueymirou, W T -- Panaro, F J -- Na, E -- Dharmarajan, K -- Pan, Z Q -- Valenzuela, D M -- DeChiara, T M -- Stitt, T N -- Yancopoulos, G D -- Glass, D J -- New York, N.Y. -- Science. 2001 Nov 23;294(5547):1704-8. Epub 2001 Oct 25.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Regeneron Pharmaceuticals, 777 Old Saw Mill River Road, Tarrytown, NY, 10591-6707, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11679633" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Sequence ; Animals ; Cloning, Molecular ; Creatine Kinase/genetics ; Creatine Kinase, MM Form ; *DNA-Binding Proteins ; Gene Deletion ; *Gene Expression Profiling ; Hindlimb Suspension ; Humans ; Immobilization ; Isoenzymes/genetics ; Mice ; Mice, Knockout ; Molecular Sequence Data ; Muscle Denervation ; Muscle Proteins/genetics ; Muscle, Skeletal/growth & development/*metabolism/pathology/physiopathology ; Muscular Atrophy/*genetics/pathology/physiopathology ; MyoD Protein/genetics ; Myogenic Regulatory Factor 5 ; Myogenin/genetics ; Peptide Synthases/chemistry/deficiency/genetics/*metabolism ; Phenotype ; Protein Binding ; RNA, Messenger/analysis/genetics ; Rats ; Rats, Sprague-Dawley ; SKP Cullin F-Box Protein Ligases ; *Trans-Activators ; Up-Regulation
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  • 72
    Publication Date: 2001-12-01
    Description: Neurotrophins are growth factors that promote cell survival, differentiation, and cell death. They are synthesized as proforms that can be cleaved intracellularly to release mature, secreted ligands. Although proneurotrophins have been considered inactive precursors, we show here that the proforms of nerve growth factor (NGF) and the proforms of brain derived neurotrophic factor (BDNF) are secreted and cleaved extracellularly by the serine protease plasmin and by selective matrix metalloproteinases (MMPs). ProNGF is a high-affinity ligand for p75(NTR) with high affinity and induced p75NTR-dependent apoptosis in cultured neurons with minimal activation of TrkA-mediated differentiation or survival. The biological action of neurotrophins is thus regulated by proteolytic cleavage, with proforms preferentially activating p75NTR to mediate apoptosis and mature forms activating Trk receptors to promote survival.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Lee, R -- Kermani, P -- Teng, K K -- Hempstead, B L -- NS30687/NS/NINDS NIH HHS/ -- T32 EY07138/EY/NEI NIH HHS/ -- New York, N.Y. -- Science. 2001 Nov 30;294(5548):1945-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Division of Hematology, Department of Medicine, Weill Medical College of Cornell University, 1300 York Avenue, New York, NY 10021, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11729324" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Apoptosis/drug effects ; Brain-Derived Neurotrophic Factor/chemistry/metabolism/pharmacology/secretion ; Cell Death/drug effects ; Cell Differentiation/drug effects ; Cell Line ; *Cell Survival/drug effects ; Fibrinolysin/metabolism ; Furin ; Humans ; Inhibitory Concentration 50 ; Matrix Metalloproteinases/metabolism ; Mice ; Nerve Growth Factor/chemistry/metabolism/pharmacology/secretion ; Nerve Growth Factors/chemistry/*metabolism/pharmacology/*secretion ; Neurons/cytology/drug effects ; Phosphorylation/drug effects ; Protein Precursors/chemistry/*metabolism/pharmacology/*secretion ; Protein Processing, Post-Translational ; Rats ; Receptor, Nerve Growth Factor ; Receptor, trkA/metabolism ; Receptors, Nerve Growth Factor/metabolism ; Subtilisins/metabolism
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  • 73
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-06-26
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Helmuth, L -- New York, N.Y. -- Science. 2001 Jun 22;292(5525):2233.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11423630" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Animals ; In Vitro Techniques ; Interneurons/*physiology ; Neocortex/cytology/*physiology ; Nerve Net/*physiology ; Pyramidal Cells/*physiology ; Rats ; Synapses/physiology ; Synaptic Transmission ; Time Factors ; gamma-Aminobutyric Acid/metabolism
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  • 74
    Publication Date: 2001-08-11
    Description: The temporal resolution of neuronal integration depends on the time window within which excitatory inputs summate to reach the threshold for spike generation. Here, we show that in rat hippocampal pyramidal cells this window is very narrow (less than 2 milliseconds). This narrowness results from the short delay with which disynaptic feed-forward inhibition follows monosynaptic excitation. Simultaneous somatic and dendritic recordings indicate that feed-forward inhibition is much stronger in the soma than in the dendrites, resulting in a broader integration window in the latter compartment. Thus, the subcellular partitioning of feed-forward inhibition enforces precise coincidence detection in the soma, while allowing dendrites to sum incoming activity over broader time windows.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Pouille, F -- Scanziani, M -- New York, N.Y. -- Science. 2001 Aug 10;293(5532):1159-63.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Brain Research Institute, University of Zurich, Winterthurerstrasse 190, CH-8057 Zurich, Switzerland.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11498596" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Animals ; Axons/physiology ; Bicuculline/pharmacology ; Dendrites/physiology ; Electric Stimulation ; Evoked Potentials ; *Excitatory Postsynaptic Potentials ; GABA Antagonists/pharmacology ; GABA-A Receptor Antagonists ; Hippocampus/cytology/*physiology ; In Vitro Techniques ; Interneurons/physiology ; *Neural Inhibition ; Patch-Clamp Techniques ; Pyramidal Cells/*physiology ; Pyridazines/pharmacology ; Rats ; Rats, Wistar ; Receptors, GABA-A/metabolism ; *Synaptic Transmission ; Time Factors
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  • 75
    Publication Date: 2001-05-12
    Description: T cell activation is dependent on both a primary signal delivered through the T cell receptor and a secondary costimulatory signal mediated by coreceptors. Although controversial, costimulation is thought to act through the specific redistribution and clustering of membrane and intracellular kinase-rich lipid raft microdomains at the contact site between T cells and antigen-presenting cells. This site has been termed the immunological synapse. Endogenous mediators of raft clustering in lymphocytes have not been identified, although they are essential for T cell activation. We now demonstrate that agrin, an aggregating protein crucial for formation of the neuromuscular junction, is also expressed in lymphocytes and is important in reorganization of membrane lipid microdomains and setting the threshold for T cell signaling. Our data show that agrin induces the aggregation of signaling proteins and the creation of signaling domains in both immune and nervous systems through a common lipid raft pathway.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Khan, A A -- Bose, C -- Yam, L S -- Soloski, M J -- Rupp, F -- R01AI20922/AI/NIAID NIH HHS/ -- New York, N.Y. -- Science. 2001 Jun 1;292(5522):1681-6. Epub 2001 May 10.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Outer Banks Neuroscience, Baltimore, MD 21218, USA. outerbanksneuro@yahoo.com〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11349136" target="_blank"〉PubMed〈/a〉
    Keywords: Agrin/genetics/metabolism/*physiology ; Alternative Splicing ; Animals ; Antigen-Presenting Cells/immunology/*physiology ; B-Lymphocytes/metabolism ; Glycosylation ; *Lymphocyte Activation ; Male ; Membrane Microdomains/*physiology ; Mice ; Neuromuscular Junction/physiology ; Neurons/physiology ; Rats ; Rats, Sprague-Dawley ; Receptor Aggregation ; Receptors, Antigen, T-Cell/physiology ; Receptors, Cholinergic/physiology ; Signal Transduction ; T-Lymphocyte Subsets/metabolism ; T-Lymphocytes/immunology/*physiology
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  • 76
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-11-03
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Holden, C -- New York, N.Y. -- Science. 2001 Nov 2;294(5544):980-2.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11691967" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; *Behavior, Addictive/physiopathology/psychology ; Brain/*physiology ; Brain Mapping ; Compulsive Behavior/physiopathology/psychology ; Feeding and Eating Disorders/physiopathology/psychology ; Female ; Gambling/psychology ; Humans ; Internet ; Magnetic Resonance Imaging ; Male ; Rats ; *Reward ; Sexual Behavior/physiology/psychology ; Substance-Related Disorders/physiopathology/psychology
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  • 77
    Publication Date: 2001-06-26
    Description: The temporal pattern and relative timing of action potentials among neocortical neurons may carry important information. However, how cortical circuits detect or generate coherent activity remains unclear. Using paired recordings in rat neocortical slices, we found that the firing of fast-spiking cells can reflect the spiking pattern of single-axon pyramidal inputs. Moreover, this property allowed groups of fast-spiking cells interconnected by electrical and gamma-aminobutyric acid (GABA)-releasing (GABAergic) synapses to detect the relative timing of their excitatory inputs. These results indicate that networks of fast-spiking cells may play a role in the detection and promotion of synchronous activity within the neocortex.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Galarreta, M -- Hestrin, S -- EY09120/EY/NEI NIH HHS/ -- EY12114/EY/NEI NIH HHS/ -- New York, N.Y. -- Science. 2001 Jun 22;292(5525):2295-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Comparative Medicine, Department of Neurology and Neurological Sciences, Stanford University School of Medicine, Stanford, CA 94305, USA. galarreta@stanford.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11423653" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Animals ; Axons/physiology ; Excitatory Postsynaptic Potentials ; Female ; In Vitro Techniques ; Interneurons/*physiology ; Kinetics ; Male ; Neocortex/cytology/*physiology ; Nerve Net/*physiology ; Pyramidal Cells/*physiology ; Rats ; Rats, Sprague-Dawley ; Synapses/physiology ; *Synaptic Transmission ; Time Factors ; gamma-Aminobutyric Acid/*metabolism
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  • 78
    Publication Date: 2001-03-10
    Description: Netrins stimulate and orient axon growth through a mechanism requiring receptors of the DCC family. It has been unclear, however, whether DCC proteins are involved directly in signaling or are mere accessory proteins in a receptor complex. Further, although netrins bind cells expressing DCC, direct binding to DCC has not been demonstrated. Here we show that netrin-1 binds DCC and that the DCC cytoplasmic domain fused to a heterologous receptor ectodomain can mediate guidance through a mechanism involving derepression of cytoplasmic domain multimerization. Activation of the adenosine A2B receptor, proposed to contribute to netrin effects on axons, is not required for rat commissural axon outgrowth or Xenopus spinal axon attraction to netrin-1. Thus, DCC plays a central role in netrin signaling of axon growth and guidance independent of A2B receptor activation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Stein, E -- Zou, Y -- Poo , M -- Tessier-Lavigne, M -- New York, N.Y. -- Science. 2001 Mar 9;291(5510):1976-82.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Anatomy, Howard Hughes Medical Institute, University of California, San Francisco, CA 94143-0452, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11239160" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Axons/*physiology ; Cell Adhesion Molecules/chemistry/genetics/*metabolism ; Cell Line ; Cell Movement ; Cells, Cultured ; Culture Techniques ; Embryo, Nonmammalian ; Growth Cones/physiology ; Hepatocyte Growth Factor/metabolism/pharmacology ; Ligands ; Nerve Growth Factors/*metabolism/pharmacology ; Neurons/metabolism ; Protein Conformation ; Protein Structure, Tertiary ; Purinergic P1 Receptor Agonists ; Purinergic P1 Receptor Antagonists ; Rats ; Receptor, Adenosine A2B ; Receptors, Cell Surface/chemistry/genetics/*metabolism ; Receptors, Purinergic P1/genetics/*metabolism ; Recombinant Fusion Proteins/metabolism ; Signal Transduction ; Spinal Cord/cytology/metabolism ; *Tumor Suppressor Proteins ; Xanthines/pharmacology ; Xenopus/embryology
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  • 79
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-05-09
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Gallo, V -- Chittajallu, R -- New York, N.Y. -- Science. 2001 May 4;292(5518):872-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Cellular and Synaptic Neurophysiology, National Institute of Child Health and Human Development, National Institutes of Health, Bethesda, MD 20892-4495, USA. vgallo@helix.nih.gov〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11341285" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Astrocytes/*physiology ; Calcium/metabolism ; Calcium Signaling ; Cerebellar Cortex/physiology ; Excitatory Postsynaptic Potentials ; Glutamic Acid/metabolism ; Neurons/*physiology ; Purkinje Cells/physiology ; Rats ; Receptors, AMPA/physiology ; Receptors, Metabotropic Glutamate/metabolism ; Supraoptic Nucleus/physiology ; Synapses/*physiology ; *Synaptic Transmission
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  • 80
    Publication Date: 2001-05-08
    Description: Analysis of excitatory synaptic transmission in the rat hypothalamic supraoptic nucleus revealed that glutamate clearance and, as a consequence, glutamate concentration and diffusion in the extracellular space, is associated with the degree of astrocytic coverage of its neurons. Reduction in glutamate clearance, whether induced pharmacologically or associated with a relative decrease of glial coverage in the vicinity of synapses, affected transmitter release through modulation of presynaptic metabotropic glutamate receptors. Astrocytic wrapping of neurons, therefore, contributes to the regulation of synaptic efficacy in the central nervous system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Oliet, S H -- Piet, R -- Poulain, D A -- New York, N.Y. -- Science. 2001 May 4;292(5518):923-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉INSERM U.378, Universite Victor Segalen-Bordeaux 2, 33077 Bordeaux, France. stephane.oliet@bordeaux.inserm.fr〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11340204" target="_blank"〉PubMed〈/a〉
    Keywords: ATP-Binding Cassette Transporters/antagonists & inhibitors/metabolism ; Amino Acid Transport System X-AG ; Aminobutyrates/pharmacology ; Animals ; Astrocytes/*physiology ; Dicarboxylic Acids/pharmacology ; Excitatory Amino Acid Agonists/pharmacology ; Excitatory Amino Acid Antagonists/pharmacology ; Excitatory Postsynaptic Potentials ; Female ; Glutamic Acid/*metabolism ; In Vitro Techniques ; Lactation ; Neurons/*physiology ; Neurotransmitter Uptake Inhibitors/pharmacology ; Pyrrolidines/pharmacology ; Rats ; Rats, Wistar ; Receptors, AMPA/antagonists & inhibitors/metabolism ; Receptors, Metabotropic Glutamate/metabolism ; Supraoptic Nucleus/cytology/*physiology ; Synapses/*physiology ; *Synaptic Transmission/drug effects
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  • 81
    Publication Date: 2001-06-26
    Description: Outer hair cells (OHCs) of the mammalian cochlea actively change their cell length in response to changes in membrane potential. This electromotility, thought to be the basis of cochlear amplification, is mediated by a voltage-sensitive motor molecule recently identified as the membrane protein prestin. Here, we show that voltage sensitivity is conferred to prestin by the intracellular anions chloride and bicarbonate. Removal of these anions abolished fast voltage-dependent motility, as well as the characteristic nonlinear charge movement ("gating currents") driving the underlying structural rearrangements of the protein. The results support a model in which anions act as extrinsic voltage sensors, which bind to the prestin molecule and thus trigger the conformational changes required for motility of OHCs.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Oliver, D -- He, D Z -- Klocker, N -- Ludwig, J -- Schulte, U -- Waldegger, S -- Ruppersberg, J P -- Dallos, P -- Fakler, B -- DC00089/DC/NIDCD NIH HHS/ -- New York, N.Y. -- Science. 2001 Jun 22;292(5525):2340-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Physiology II, University of Tubingen, 72074 Tubingen, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11423665" target="_blank"〉PubMed〈/a〉
    Keywords: Amino Acid Substitution ; Animals ; Anion Transport Proteins ; Anions/pharmacology ; Bicarbonates/*metabolism/pharmacology ; CHO Cells ; Cations/pharmacology ; Cell Membrane/metabolism ; Chlorides/*metabolism/pharmacology ; Cricetinae ; Electric Conductivity ; Electrophysiology ; Hair Cells, Auditory, Outer/*physiology ; Models, Biological ; Mutation ; Patch-Clamp Techniques ; Protein Conformation ; Proteins/chemistry/genetics/*metabolism ; Rats
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  • 82
    Publication Date: 2002-02-09
    Description: Light synchronizes mammalian circadian rhythms with environmental time by modulating retinal input to the circadian pacemaker-the suprachiasmatic nucleus (SCN) of the hypothalamus. Such photic entrainment requires neither rods nor cones, the only known retinal photoreceptors. Here, we show that retinal ganglion cells innervating the SCN are intrinsically photosensitive. Unlike other ganglion cells, they depolarized in response to light even when all synaptic input from rods and cones was blocked. The sensitivity, spectral tuning, and slow kinetics of this light response matched those of the photic entrainment mechanism, suggesting that these ganglion cells may be the primary photoreceptors for this system.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Berson, David M -- Dunn, Felice A -- Takao, Motoharu -- EY12793/EY/NEI NIH HHS/ -- New York, N.Y. -- Science. 2002 Feb 8;295(5557):1070-3.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neuroscience, Brown University, Providence, RI, 02912 USA. David_Berson@brown.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11834835" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Axons/ultrastructure ; *Biological Clocks ; *Circadian Rhythm ; Dendrites/ultrastructure ; Isoquinolines ; Kinetics ; Light ; *Light Signal Transduction ; Patch-Clamp Techniques ; Rats ; Rats, Sprague-Dawley ; Retinal Ganglion Cells/chemistry/cytology/*physiology ; Rod Opsins/analysis/physiology ; Suprachiasmatic Nucleus/cytology/*physiology
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  • 83
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    Unknown
    American Association for the Advancement of Science (AAAS)
    Publication Date: 2002-11-16
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marx, Jean -- New York, N.Y. -- Science. 2002 Nov 15;298(5597):1319.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12434030" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antibodies, Catalytic/*physiology ; Arthus Reaction ; Catalysis ; Escherichia coli/*physiology ; Humans ; Hydrogen Peroxide/metabolism ; Neutrophils/metabolism ; Oxidants/metabolism ; Oxidation-Reduction ; Ozone/*metabolism ; Rats ; Singlet Oxygen/metabolism
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  • 84
    Publication Date: 2002-06-08
    Description: The central nervous system (CNS) loses the ability to regenerate early during development, but it is not known why. The retina has long served as a simple model system for study of CNS regeneration. Here we show that amacrine cells signal neonatal rat retinal ganglion cells (RGCs) to undergo a profound and apparently irreversible loss of intrinsic axon growth ability. Concurrently, retinal maturation triggers RGCs to greatly increase their dendritic growth ability. These results suggest that adult CNS neurons fail to regenerate not only because of CNS glial inhibition but also because of a loss of intrinsic axon growth ability.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Goldberg, Jeffrey L -- Klassen, Matthew P -- Hua, Ying -- Barres, Ben A -- 2T32GM07365/GM/NIGMS NIH HHS/ -- R01 EY11030/EY/NEI NIH HHS/ -- New York, N.Y. -- Science. 2002 Jun 7;296(5574):1860-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Stanford University School of Medicine, Department of Neurobiology, Sherman Fairchild Science Building D231, 299 Campus Drive, Stanford, CA 94305-5125, USA. jlgoldbe@stanford.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12052959" target="_blank"〉PubMed〈/a〉
    Keywords: Aging ; Amacrine Cells/*physiology ; Animals ; Animals, Newborn ; Axons/*physiology/ultrastructure ; Cell Aging ; *Cell Communication ; Cell Separation ; Cells, Cultured ; Culture Media, Conditioned ; Culture Techniques ; Cyclic AMP/metabolism ; Dendrites/physiology/ultrastructure ; Embryo, Mammalian ; Nerve Regeneration ; Proto-Oncogene Proteins c-bcl-2/metabolism ; Rats ; Retina/cytology ; Retinal Ganglion Cells/*physiology/transplantation/ultrastructure ; Signal Transduction ; Superior Colliculi/physiology
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  • 85
    Publication Date: 2002-03-23
    Description: P/Q-type presynaptic calcium currents (IpCa) undergo activity-dependent facilitation during repetitive activation at the calyx of the Held synapse. We investigated whether neuronal calcium sensor 1 (NCS-1) may underlie this phenomenon. Direct loading of NCS-1 into the nerve terminal mimicked activity-dependent IpCa facilitation by accelerating the activation time of IpCa in a Ca2+-dependent manner. A presynaptically loaded carboxyl-terminal peptide of NCS-1 abolished IpCa facilitation. These results suggest that residual Ca2+ activates endogenous NCS-1, thereby facilitating IpCa. Because both P/Q-type Ca2+ channels and NCS-1 are widely expressed in mammalian nerve terminals, NCS-1 may contribute to the activity-dependent synaptic facilitation at many synapses.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Tsujimoto, Tetsuhiro -- Jeromin, Andreas -- Saitoh, Naoto -- Roder, John C -- Takahashi, Tomoyuki -- New York, N.Y. -- Science. 2002 Mar 22;295(5563):2276-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurophysiology, University of Tokyo Faculty of Medicine, Tokyo 113-0033, Japan. tujimoto-tky@umin.ac.jp〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11910115" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials/drug effects ; Amino Acid Sequence ; Animals ; Brain Stem/cytology/drug effects/metabolism ; Calcium/*metabolism/pharmacology ; Calcium Channels/*metabolism ; Calcium-Binding Proteins/administration & ; dosage/chemistry/*metabolism/pharmacology ; Electric Conductivity ; In Vitro Techniques ; Ion Channel Gating/drug effects ; Molecular Sequence Data ; Neuronal Calcium-Sensor Proteins ; Neuropeptides/administration & dosage/chemistry/*metabolism/pharmacology ; Presynaptic Terminals/drug effects/*metabolism ; Rats ; Rats, Wistar
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  • 86
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2002-03-09
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Mel, Bartlett W -- New York, N.Y. -- Science. 2002 Mar 8;295(5561):1845-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biomedical Engineering and Neuroscience Graduate Program, University of Southern California, Los Angeles, CA 90089, USA. mel@usc.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11884739" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Animals ; Calcium/metabolism ; Calcium Signaling ; Dendrites/*physiology ; *Excitatory Postsynaptic Potentials ; Hippocampus/cytology/physiology ; Neocortex/cytology/*physiology ; Patch-Clamp Techniques ; Pyramidal Cells/*physiology ; Rats ; Synapses/*physiology ; Synaptic Transmission
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  • 87
    Publication Date: 2002-06-22
    Description: Place cells in hippocampal area CA1 may receive positional information from the intrahippocampal associative network in area CA3 or directly from the entorhinal cortex. To determine whether direct entorhinal connections support spatial firing and spatial memory, we removed all input from areas CA3 to CA1, thus isolating the CA1 area. Pyramidal cells in the isolated CA1 area developed sharp and stable place fields. Rats with an isolated CA1 area showed normal acquisition of an associative hippocampal-dependent spatial recognition task. Spatial recall was impaired. These results suggest that the hippocampus contains two functionally separable memory circuits: The direct entorhinal-CA1 system is sufficient for recollection-based recognition memory, but recall depends on intact CA3-CA1 connectivity.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Brun, Vegard H -- Otnass, Mona K -- Molden, Sturla -- Steffenach, Hill-Aina -- Witter, Menno P -- Moser, May-Britt -- Moser, Edvard I -- New York, N.Y. -- Science. 2002 Jun 21;296(5576):2243-6.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Neuroscience Unit, Medical-Technical Research Centre, Norwegian University of Science and Technology, 7489 Trondheim, Norway.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12077421" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Animals ; Brain Mapping ; Denervation ; Electrodes, Implanted ; Entorhinal Cortex/*physiology ; Hippocampus/*cytology/*physiology ; Interneurons/physiology ; Maze Learning ; Memory/*physiology ; Mental Recall/physiology ; Nerve Net/physiology ; Neural Pathways ; Pyramidal Cells/*physiology ; Rats ; Space Perception/*physiology
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  • 88
    Publication Date: 2002-01-19
    Description: To explore neuronal mechanisms underlying long-term consequences of stress, we studied stress-induced changes in the neuritic translocation of acetylcholinesterase (AChE) splice variants. Under normal conditions, we found the synaptic AChE-S mRNA and protein in neurites. Corticosterone, anticholinesterases, and forced swim, each facilitated a rapid (minutes), yet long-lasting (weeks), shift from AChE-S to the normally rare AChE-R mRNA, promoted AChE-R mRNA translocation into neurites, and induced enzyme secretion. Weeks after stress, electrophysiological measurements in hippocampus slices displayed apparently normal evoked synaptic responses but extreme hypersensitivity to both anticholinesterases and atropine. Our findings suggest that neuronal hypersensitivity under stress involves neuritic replacement of AChE-S with AChE-R.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Meshorer, Eran -- Erb, Christina -- Gazit, Roi -- Pavlovsky, Lev -- Kaufer, Daniela -- Friedman, Alon -- Glick, David -- Ben-Arie, Nissim -- Soreq, Hermona -- New York, N.Y. -- Science. 2002 Jan 18;295(5554):508-12.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Biological Chemistry, The Institute of Life Sciences and The Eric Roland Center for Neurodegenerative Diseases, The Hebrew University of Jerusalem, Israel 91904.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11799248" target="_blank"〉PubMed〈/a〉
    Keywords: Acetylcholine/metabolism ; Acetylcholinesterase/*genetics/*metabolism ; Action Potentials ; *Alternative Splicing ; Animals ; Atropine/pharmacology ; Cells, Cultured ; Cerebellum/cytology ; Cholinesterase Inhibitors/pharmacology ; Corticosterone/pharmacology ; Hippocampus/cytology/metabolism/physiology ; In Situ Hybridization, Fluorescence ; In Vitro Techniques ; Mice ; Mice, Transgenic ; Neurites/*metabolism ; Neurons/*metabolism ; Oligonucleotides, Antisense/pharmacology ; PC12 Cells ; Physostigmine/pharmacology ; RNA, Messenger/genetics/*metabolism ; Rats ; Stress, Physiological/genetics/*physiopathology ; Time Factors
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  • 89
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2002-07-13
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bull, James J -- Parrish, Colin R -- New York, N.Y. -- Science. 2002 Jul 12;297(5579):201-2.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Section of Integrative Biology and Institute for Cellular and Molecular Biology, University of Texas, Austin, TX 78712, USA. bull@bull.biosci.utexas.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12114612" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Anthrax/prevention & control/therapy ; Anthrax Vaccines/adverse effects/immunology ; Antibodies, Bacterial/genetics/*immunology/metabolism/therapeutic use ; Antibody Affinity ; Antigen-Antibody Complex/blood ; *Antigens, Bacterial ; Antitoxins/genetics/*immunology/metabolism/therapeutic use ; Bacillus anthracis/*immunology ; Bacterial Toxins/*immunology/metabolism/toxicity ; Bioterrorism ; Drug Industry ; Escherichia coli/genetics ; Genetic Engineering ; Humans ; Immunization, Passive ; Macrophages, Alveolar/metabolism ; Peptide Library ; Rats ; Receptors, Peptide/metabolism ; Recombinant Proteins
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  • 90
    Publication Date: 2002-01-19
    Description: Application of nerve growth factor (NGF) covalently cross-linked to beads increased the phosphorylation of TrkA and Akt, but not of mitogen-activated protein kinase, in cultured rat sympathetic neurons. NGF beads or iodine-125-labeled NGF beads supplied to distal axons resulted in the survival of over 80% of the neurons for 30 hours, with little or no retrograde transport of iodine-125-labeled NGF; whereas application of free iodine-125-labeled NGF (0.5 nanograms per milliliter) produced 20-fold more retrograde transport, but only 29% of the neurons survived. Thus, in contrast to widely accepted theory, a neuronal survival signal can reach the cell bodies unaccompanied by the NGF that initiated it.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉MacInnis, Bronwyn L -- Campenot, Robert B -- New York, N.Y. -- Science. 2002 Feb 22;295(5559):1536-9. Epub 2002 Jan 17.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Cell Biology, 6-14 Medical Sciences Building, University of Alberta, Edmonton, Alberta, Canada, T6G 2H7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11799202" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Axons/*metabolism ; Cell Survival/drug effects ; Cells, Cultured ; Chromones/pharmacology ; Cross-Linking Reagents ; Enzyme Inhibitors/pharmacology ; Iodine Radioisotopes ; Microspheres ; Mitogen-Activated Protein Kinases/metabolism ; Morpholines/pharmacology ; Nerve Growth Factor/*metabolism/pharmacology ; Neurons/metabolism/*physiology ; Phosphatidylinositol 3-Kinases/antagonists & inhibitors/metabolism ; Phosphorylation ; Protein Transport ; *Protein-Serine-Threonine Kinases ; Proto-Oncogene Proteins/metabolism ; Proto-Oncogene Proteins c-akt ; Rats ; Rats, Sprague-Dawley ; Receptor, trkA/metabolism ; Signal Transduction ; Superior Cervical Ganglion
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  • 91
    Publication Date: 2002-06-29
    Description: Myeloperoxidase (MPO) is an abundant mammalian phagocyte hemoprotein thought to primarily mediate host defense reactions. Although its microbicidal functions are well established in vitro, humans deficient in MPO are not at unusual risk of infection. MPO was observed herein to modulate the vascular signaling and vasodilatory functions of nitric oxide (NO) during acute inflammation. After leukocyte degranulation, MPO localized in and around vascular endothelial cells in a rodent model of acute endotoxemia and impaired endothelium-dependent relaxant responses, to which MPO-deficient mice were resistant. Altered vascular responsiveness was due to catalytic consumption of NO by substrate radicals generated by MPO. Thus MPO can directly modulate vascular inflammatory responses by regulating NO bioavailability.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Eiserich, Jason P -- Baldus, Stephan -- Brennan, Marie-Luise -- Ma, Wenxin -- Zhang, Chunxiang -- Tousson, Albert -- Castro, Laura -- Lusis, Aldons J -- Nauseef, William M -- White, C Roger -- Freeman, Bruce A -- I01 BX000513/BX/BLRD VA/ -- R01 HL067930/HL/NHLBI NIH HHS/ -- R03 TW005682/TW/FIC NIH HHS/ -- New York, N.Y. -- Science. 2002 Jun 28;296(5577):2391-4.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Internal Medicine, Division of Nephrology, University of California, Davis, CA 95616, USA. jpeiserich@ucdavis.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/12089442" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Aorta ; Catalysis ; Cattle ; Cells, Cultured ; Chromans/metabolism/pharmacology ; Coculture Techniques ; Cyclic GMP/metabolism ; Endothelium, Vascular/enzymology/*physiology ; Endotoxemia/enzymology ; Humans ; Hydrogen Peroxide/metabolism/pharmacology ; Inflammation/*enzymology/physiopathology ; Leukocytes/*enzymology ; Mice ; Mice, Inbred C57BL ; Muscle, Smooth, Vascular/metabolism ; Mutation ; Nitric Oxide/*metabolism ; Oxidation-Reduction ; Peroxidase/genetics/*metabolism ; Rats ; Rats, Sprague-Dawley ; Signal Transduction ; Transfection ; Tumor Cells, Cultured ; *Vasodilation
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  • 92
    Publication Date: 2000-12-02
    Description: OX2 (CD200) is a broadly expressed membrane glycoprotein, shown here to be important for regulation of the macrophage lineage. In mice lacking CD200, macrophage lineage cells, including brain microglia, exhibited an activated phenotype and were more numerous. Upon facial nerve transection, damaged CD200-deficient neurons elicited an accelerated microglial response. Lack of CD200 resulted in a more rapid onset of experimental autoimmune encephalomyelitis (EAE). Outside the brain, disruption of CD200-CD200 receptor interaction precipitated susceptibility to collagen-induced arthritis (CIA) in mice normally resistant to this disease. Thus, in diverse tissues OX2 delivers an inhibitory signal for the macrophage lineage.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Hoek, R M -- Ruuls, S R -- Murphy, C A -- Wright, G J -- Goddard, R -- Zurawski, S M -- Blom, B -- Homola, M E -- Streit, W J -- Brown, M H -- Barclay, A N -- Sedgwick, J D -- New York, N.Y. -- Science. 2000 Dec 1;290(5497):1768-71.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉DNAX Research Institute of Molecular and Cellular Biology, 901 California Avenue, Palo Alto, CA 94304, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11099416" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Antigens, CD ; Antigens, Surface/*metabolism ; Arthritis, Experimental/immunology/pathology ; Cell Lineage ; Central Nervous System/immunology/pathology ; Denervation ; *Down-Regulation ; Encephalomyelitis, Autoimmune, Experimental/immunology/pathology ; Facial Nerve ; Gene Targeting ; Joints/immunology/pathology ; Lymph Nodes/cytology ; Macrophage Activation ; Macrophages/cytology/metabolism/*physiology ; Mice ; Mice, Inbred C57BL ; Microglia/physiology ; Neurons/physiology ; Rats ; Receptors, Immunologic/metabolism ; Spleen/cytology
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  • 93
    Publication Date: 2000-02-11
    Description: The deleterious effects of ethanol on the developing human brain are poorly understood. Here it is reported that ethanol, acting by a dual mechanism [blockade of N-methyl-D-aspartate (NMDA) glutamate receptors and excessive activation of GABA(A) receptors], triggers widespread apoptotic neurodegeneration in the developing rat forebrain. Vulnerability coincides with the period of synaptogenesis, which in humans extends from the sixth month of gestation to several years after birth. During this period, transient ethanol exposure can delete millions of neurons from the developing brain. This can explain the reduced brain mass and neurobehavioral disturbances associated with human fetal alcohol syndrome.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Ikonomidou, C -- Bittigau, P -- Ishimaru, M J -- Wozniak, D F -- Koch, C -- Genz, K -- Price, M T -- Stefovska, V -- Horster, F -- Tenkova, T -- Dikranian, K -- Olney, J W -- AG 11355/AG/NIA NIH HHS/ -- DA 05072/DA/NIDA NIH HHS/ -- MH 38894/MH/NIMH NIH HHS/ -- etc. -- New York, N.Y. -- Science. 2000 Feb 11;287(5455):1056-60.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pediatric Neurology, Charite, Virchow Clinics, Humboldt University, Augustenburger Platz 1, 13353 Berlin, Germany.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10669420" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Apoptosis ; Benzodiazepines/pharmacology ; Dose-Response Relationship, Drug ; Ethanol/administration & dosage/blood/*toxicity ; Female ; Fetal Alcohol Spectrum Disorders/*pathology ; GABA Modulators/pharmacology ; Humans ; *Nerve Degeneration ; Neurons/cytology/pathology ; Organ Size/drug effects ; Pregnancy ; Prosencephalon/cytology/*drug effects/embryology/growth & development ; Rats ; Rats, Sprague-Dawley ; Receptors, GABA-A/*drug effects/metabolism ; Receptors, N-Methyl-D-Aspartate/antagonists & inhibitors/*drug effects/metabolism ; Synapses/drug effects/physiology
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  • 94
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    Unknown
    American Association for the Advancement of Science (AAAS)
    Publication Date: 2000-03-18
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Helmuth, L -- New York, N.Y. -- Science. 2000 Feb 25;287(5457):1379, 1381.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10722377" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Blood-Brain Barrier ; Brain/*pathology ; Cell Death ; Dependovirus/genetics ; Gene Transfer Techniques ; Humans ; Neurons/*pathology ; Rats ; Receptors, N-Methyl-D-Aspartate/antagonists & ; inhibitors/*genetics/*immunology/physiology ; Status Epilepticus/pathology/*therapy ; Stroke/pathology/*therapy ; Vaccination ; Vaccines, DNA/*therapeutic use
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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  • 95
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2000-08-11
    Description: Synaptic efficacy critically depends on the presynaptic intracellular calcium concentration ([Ca2+]i). We measured the calcium sensitivity of glutamate release in a rat auditory brainstem synapse by laser photolysis of caged calcium. A rise in [Ca2+]i to 1 micromolar readily evoked release. An increase to 〉30 micromolar depleted the releasable vesicle pool in 〈0.5 millisecond. A comparison with action potential-evoked release suggested that a brief increase of [Ca2+]i to approximately 10 micromolar would be sufficient to reproduce the physiological release pattern. Thus, the calcium sensitivity of release at this synapse is high, and the distinction between phasic and delayed release is less pronounced than previously thought.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Bollmann, J H -- Sakmann, B -- Borst, J G -- New York, N.Y. -- Science. 2000 Aug 11;289(5481):953-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Max-Planck-Institute for Medical Research, Department of Cell Physiology, Jahnstrasse 29, D-69120 Heidelberg, Germany. jbollman@mpimf-heidelberg.mpg.de〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10937999" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Animals ; Brain Stem/*metabolism ; Calcium/*metabolism ; Excitatory Postsynaptic Potentials ; Glutamic Acid/*metabolism ; Patch-Clamp Techniques ; Photolysis ; Presynaptic Terminals/metabolism ; Rats ; Rats, Wistar ; Synapses/*metabolism ; Synaptic Transmission ; Synaptic Vesicles/metabolism
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  • 96
    Publication Date: 2000-04-28
    Description: In multicellular organisms, circadian oscillators are organized into multitissue systems which function as biological clocks that regulate the activities of the organism in relation to environmental cycles and provide an internal temporal framework. To investigate the organization of a mammalian circadian system, we constructed a transgenic rat line in which luciferase is rhythmically expressed under the control of the mouse Per1 promoter. Light emission from cultured suprachiasmatic nuclei (SCN) of these rats was invariably and robustly rhythmic and persisted for up to 32 days in vitro. Liver, lung, and skeletal muscle also expressed circadian rhythms, which damped after two to seven cycles in vitro. In response to advances and delays of the environmental light cycle, the circadian rhythm of light emission from the SCN shifted more rapidly than did the rhythm of locomotor behavior or the rhythms in peripheral tissues. We hypothesize that a self-sustained circadian pacemaker in the SCN entrains circadian oscillators in the periphery to maintain adaptive phase control, which is temporarily lost following large, abrupt shifts in the environmental light cycle.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Yamazaki, S -- Numano, R -- Abe, M -- Hida, A -- Takahashi, R -- Ueda, M -- Block, G D -- Sakaki, Y -- Menaker, M -- Tei, H -- MH56647/MH/NIMH NIH HHS/ -- R01 MH056647/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 2000 Apr 28;288(5466):682-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉NSF Center for Biological Timing and Department of Biology, University of Virginia, Charlottesville, VA 22903-2477, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10784453" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Genetically Modified ; Biological Clocks/*physiology ; Cell Cycle Proteins ; Circadian Rhythm/*physiology ; Culture Techniques ; Darkness ; Genes, Reporter ; Light ; Liver/physiology ; Luciferases/genetics/metabolism ; Lung/physiology ; Male ; Mice ; Motor Activity ; Muscle, Skeletal/physiology ; Nuclear Proteins/genetics/physiology ; Period Circadian Proteins ; Promoter Regions, Genetic ; Rats ; Suprachiasmatic Nucleus/*physiology
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  • 97
    Publication Date: 2000-08-01
    Description: Spermatozoa undergo a poorly understood activation process induced by bicarbonate and mediated by cyclic adenosine 3',5'-monophosphate (cAMP). It has been assumed that bicarbonate mediates its effects through changes in intracellular pH or membrane potential; however, we demonstrate here that bicarbonate directly stimulates mammalian soluble adenylyl cyclase (sAC) activity in vivo and in vitro in a pH-independent manner. sAC is most similar to adenylyl cyclases from cyanobacteria, and bicarbonate regulation of cyclase activity is conserved in these early forms of life. sAC is also expressed in other bicarbonate-responsive tissues, which suggests that bicarbonate regulation of cAMP signaling plays a fundamental role in many biological systems.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Chen, Y -- Cann, M J -- Litvin, T N -- Iourgenko, V -- Sinclair, M L -- Levin, L R -- Buck, J -- New York, N.Y. -- Science. 2000 Jul 28;289(5479):625-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Pharmacology, Joan and Sanford I. Weill Medical College of Cornell University, 1300 York Avenue, New York, NY 10021, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10915626" target="_blank"〉PubMed〈/a〉
    Keywords: Adenylyl Cyclases/chemistry/genetics/isolation & purification/*metabolism ; Animals ; Bicarbonates/*metabolism/pharmacology ; Catalytic Domain ; Cell Line ; Cyanobacteria/enzymology ; Cyclic AMP/metabolism ; Enzyme Activation ; Evolution, Molecular ; Humans ; Hydrogen-Ion Concentration ; Male ; Phylogeny ; Rats ; Recombinant Proteins/isolation & purification/metabolism ; Second Messenger Systems ; Signal Transduction ; Solubility ; Sperm Capacitation ; Spermatozoa/enzymology/*metabolism/physiology ; Testis/metabolism
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  • 98
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2000-08-26
    Description: The axonal chemoattractant netrin-1 guides spinal commissural axons by activating its receptor DCC (Deleted in Colorectal Cancer). We have found that chemical inhibitors of metalloproteases potentiate netrin-mediated axon outgrowth in vitro. We have also found that DCC is a substrate for metalloprotease-dependent ectodomain shedding, and that the inhibitors block proteolytic processing of DCC and cause an increase in DCC protein levels on axons within spinal cord explants. Thus, potentiation of netrin activity by inhibitors may result from stabilization of DCC on the axons, and proteolytic activity may regulate axon migration by controlling the number of functional extracellular axon guidance receptors.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Galko, M J -- Tessier-Lavigne, M -- New York, N.Y. -- Science. 2000 Aug 25;289(5483):1365-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Anatomy, Howard Hughes Medical Institute, University of California, San Francisco, CA 94143, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10958786" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Axons/*physiology ; CHO Cells ; Cell Adhesion Molecules/chemistry/*metabolism ; Cricetinae ; Culture Techniques ; Growth Cones/physiology ; Metalloendopeptidases/antagonists & inhibitors/*metabolism ; Nerve Growth Factors/*metabolism ; Phenanthrolines/pharmacology ; Protease Inhibitors/pharmacology ; Rats ; Spinal Cord/*cytology/*enzymology/metabolism ; *Tumor Suppressor Proteins
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  • 99
    Publication Date: 2000-07-21
    Description: The guanosine triphosphatase Rab1 regulates the transport of newly synthesized proteins from the endoplasmic reticulum to the Golgi apparatus through interaction with effector molecules, but the molecular mechanisms by which this occurs are unknown. Here, the tethering factor p115 was shown to be a Rab1 effector that binds directly to activated Rab1. Rab1 recruited p115 to coat protein complex II (COPII) vesicles during budding from the endoplasmic reticulum, where it interacted with a select set of COPII vesicle-associated SNAREs (soluble N-ethylmaleimide-sensitive factor attachment protein receptors) to form a cis-SNARE complex that promotes targeting to the Golgi apparatus. We propose that Rab1-regulated assembly of functional effector-SNARE complexes defines a conserved molecular mechanism to coordinate recognition between subcellular compartments.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Allan, B B -- Moyer, B D -- Balch, W E -- CA58689/CA/NCI NIH HHS/ -- GM 33301/GM/NIGMS NIH HHS/ -- GM42336/GM/NIGMS NIH HHS/ -- New York, N.Y. -- Science. 2000 Jul 21;289(5478):444-8.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Departments of Cell and Molecular Biology, Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/10903204" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Transport ; Carrier Proteins/*metabolism ; Endoplasmic Reticulum/*metabolism ; Golgi Apparatus/*metabolism ; Intracellular Membranes/metabolism ; Membrane Fusion ; *Membrane Glycoproteins ; Membrane Proteins/*metabolism ; Mutation ; Organelles/metabolism ; Phosphoproteins/*metabolism ; Rats ; Recombinant Fusion Proteins/metabolism ; SNARE Proteins ; *Saccharomyces cerevisiae Proteins ; *Vesicular Transport Proteins ; Viral Envelope Proteins/metabolism ; rab1 GTP-Binding Proteins/*metabolism
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  • 100
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    American Association for the Advancement of Science (AAAS)
    Publication Date: 2001-02-24
    Description: Faced with conflicting results from studies of the effects of small amounts of hormonelike chemicals in the environment, the Environmental Protection Agency enlisted the help of an expert panel, which met earlier this month to conduct an extensive review of the data. The panel concluded that estrogenic chemicals can cause biological effects in lab animals at levels below those normally found to be safe--which runs counter to the conventional wisdom in toxicology. But the implications for human health are unclear.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kaiser, J -- New York, N.Y. -- Science. 2000 Oct 27;290(5492):695-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11184192" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Benzhydryl Compounds ; Diethylstilbestrol/administration & dosage/*toxicity ; Endocrine System/*drug effects ; Estrogens, Non-Steroidal/administration & dosage/*toxicity ; Humans ; Male ; Mice ; National Institutes of Health (U.S.) ; Phenols/administration & dosage/*toxicity ; Prostate/drug effects/embryology ; Rats ; Reproducibility of Results ; Species Specificity ; Toxicity Tests ; United States ; United States Environmental Protection Agency
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    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
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