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  • 1
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    Regulation of daily locomotor activity and sleep by hypothalamic EGF receptor signaling (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-12-26
    Description: The circadian clock in the suprachiasmatic nucleus (SCN) is thought to drive daily rhythms of behavior by secreting factors that act locally within the hypothalamus. In a systematic screen, we identified transforming growth factor-alpha (TGF-alpha) as a likely SCN inhibitor of locomotion. TGF-alpha is expressed rhythmically in the SCN, and when infused into the third ventricle it reversibly inhibited locomotor activity and disrupted circadian sleep-wake cycles. These actions are mediated by epidermal growth factor (EGF) receptors on neurons in the hypothalamic subparaventricular zone. Mice with a hypomorphic EGF receptor mutation exhibited excessive daytime locomotor activity and failed to suppress activity when exposed to light. These results implicate EGF receptor signaling in the daily control of locomotor activity, and identify a neural circuit in the hypothalamus that likely mediates the regulation of behavior both by the SCN and the retina.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Kramer, A -- Yang, F C -- Snodgrass, P -- Li, X -- Scammell, T E -- Davis, F C -- Weitz, C J -- HD-18686/HD/NICHD NIH HHS/ -- MH62589/MH/NIMH NIH HHS/ -- New York, N.Y. -- Science. 2001 Dec 21;294(5551):2511-5.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Neurobiology, Harvard Medical School, Boston, MA 02115, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11752569" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Biological Clocks/drug effects/physiology ; Body Temperature/drug effects ; Cerebral Ventricles/metabolism ; Circadian Rhythm/drug effects/*physiology ; Cricetinae ; Darkness ; Epidermal Growth Factor/pharmacology ; Female ; Hypothalamus/*metabolism ; Ligands ; Light ; Male ; Mesocricetus ; Mice ; *Motor Activity/drug effects ; Neural Pathways/physiology ; Neurons/metabolism ; Point Mutation ; Receptor, Epidermal Growth Factor/genetics/*metabolism ; Retina/metabolism ; Retinal Ganglion Cells/metabolism ; Signal Transduction ; Sleep/drug effects/*physiology ; Suprachiasmatic Nucleus/*metabolism ; Transforming Growth Factor alpha/administration & ; dosage/genetics/metabolism/pharmacology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    Range shifts and adaptive responses to Quaternary climate change (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-04-28
    Description: Tree taxa shifted latitude or elevation range in response to changes in Quaternary climate. Because many modern trees display adaptive differentiation in relation to latitude or elevation, it is likely that ancient trees were also so differentiated, with environmental sensitivities of populations throughout the range evolving in conjunction with migrations. Rapid climate changes challenge this process by imposing stronger selection and by distancing populations from environments to which they are adapted. The unprecedented rates of climate changes anticipated to occur in the future, coupled with land use changes that impede gene flow, can be expected to disrupt the interplay of adaptation and migration, likely affecting productivity and threatening the persistence of many species.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Davis, M B -- Shaw, R G -- New York, N.Y. -- Science. 2001 Apr 27;292(5517):673-9.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Ecology, Evolution and Behavior, University of Minnesota, Saint Paul, MN 55108, USA. mbdavis@ecology.umn.edu〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11326089" target="_blank"〉PubMed〈/a〉
    Keywords: Adaptation, Physiological ; Biological Evolution ; *Climate ; *Ecosystem ; Genes, Plant ; Genetic Variation ; Genetics, Population ; Pollen ; Time ; Trees/genetics/*growth & development
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 3
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    The role of Drosophila mushroom body signaling in olfactory memory (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-06-09
    Description: The mushroom bodies of the Drosophila brain are important for olfactory learning and memory. To investigate the requirement for mushroom body signaling during the different phases of memory processing, we transiently inactivated neurotransmission through this region of the brain by expressing a temperature-sensitive allele of the shibire dynamin guanosine triphosphatase, which is required for synaptic transmission. Inactivation of mushroom body signaling through alpha/beta neurons during different phases of memory processing revealed a requirement for mushroom body signaling during memory retrieval, but not during acquisition or consolidation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉McGuire, S E -- Le, P T -- Davis, R L -- NS19904/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 2001 Aug 17;293(5533):1330-3. Epub 2001 Jun 7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Department of Molecular and Cellular 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/11397912" target="_blank"〉PubMed〈/a〉
    Keywords: Afferent Pathways/physiology ; Animals ; Brain/physiology ; Conditioning, Classical ; Drosophila/genetics/*physiology ; *Drosophila Proteins ; Dynamins ; Electroshock ; GTP Phosphohydrolases/genetics/physiology ; Gene Targeting ; Genes, Insect ; Memory/*physiology ; Mental Recall/physiology ; Mutation ; Neurons/*physiology ; *Odors ; Signal Transduction ; *Synaptic Transmission ; Temperature ; Transgenes
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 4
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    Signal transduction: signaling specificity- a complex affair (2001)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 2001-06-30
    Description: 〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Weston, C R -- Davis, R J -- New York, N.Y. -- Science. 2001 Jun 29;292(5526):2439-40.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Program in Molecular Medicine and Howard Hughes Medical Institute, University of Massachusetts Medical School, Worcester, MA 01605, USA.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/11431552" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Axin Protein ; Binding Sites ; Calcium-Calmodulin-Dependent Protein Kinases/antagonists & ; inhibitors/chemistry/genetics/*metabolism ; Cell Membrane/metabolism ; Cytoplasm/enzymology ; Cytoskeletal Proteins/metabolism ; Drug Design ; Glycogen Synthase/metabolism ; Glycogen Synthase Kinase 3 ; Humans ; Insulin/*metabolism ; Models, Biological ; Mutation ; Phosphorylation ; Phosphoserine/metabolism ; Protein Conformation ; *Protein-Serine-Threonine Kinases ; Proteins/metabolism ; Proto-Oncogene Proteins/*metabolism ; Proto-Oncogene Proteins c-akt ; *Repressor Proteins ; *Signal Transduction ; Substrate Specificity ; *Trans-Activators ; Wnt Proteins ; *Zebrafish Proteins ; beta Catenin
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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