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    Synaptic connections in vitro: modulation of number and efficacy by electrical activity (1989)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1989-05-05
    Description: The functional architecture of synaptic circuits is determined to a crucial degree by the patterns of electrical activity that occur during development. Studies with an in vitro preparation of mammalian sensory neurons projecting to ventral spinal cord neurons slow that electrical activity induces competitive processes that regulate synaptic efficacy so as to favor activated pathways over inactive convergent pathways. At the same time, electrical activity initiates noncompetitive processes that increase the number of axonal connections between these sensory and spinal cord neurons.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Nelson, P G -- Yu, C -- Fields, R D -- Neale, E A -- New York, N.Y. -- Science. 1989 May 5;244(4904):585-7.〈br /〉〈span class="detail_caption"〉Author address: 〈/span〉Laboratory of Developmental Neurobiology, National Institute of Child Health and Human Development, Bethesda, MD 20892.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2717942" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials ; Afferent Pathways/physiology ; Animals ; Axons/physiology ; Electric Stimulation ; Ganglia, Spinal/cytology ; Mice ; Neurons/*physiology ; Neurons, Afferent/*physiology ; Spinal Cord/*cytology/embryology ; Synapses/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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  • 2
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    A coeruleo-spinal system in culture (1981)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1981-07-17
    Description: In combined cultures of dissociated spinal neurons and explants from the region of locus coeruleus, rich catecholamine-containing fiber projections from the explant to the surrounding regions of spinal neurons were demonstrated by fluorescence histochemistry. Electrical stimulation of the explant resulted in slow depolarizing responses in many of the spinal neurons. Cells exhibiting this type of response were also usually depolarized by local application of noradrenaline, whereas other, unresponsive neurons usually were not. The depolarizing responses to electrical stimulation and to noradrenaline were both increased by depolarizing current injection and decreased by hyperpolarizing current. These and other data suggest that the depolarizing responses of the spinal neurons to explant stimulation are mediated by noradrenaline released from axons of locus coeruleus neurons.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Marshall, K C -- Pun, R Y -- Hendelman, W J -- Nelson, P G -- New York, N.Y. -- Science. 1981 Jul 17;213(4505):355-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/7244621" target="_blank"〉PubMed〈/a〉
    Keywords: Animals ; Animals, Newborn ; Desipramine/pharmacology ; Locus Coeruleus/cytology/drug effects/*physiology ; Membrane Potentials/drug effects ; Mice ; Microscopy, Fluorescence ; Neurons/physiology ; Norepinephrine/pharmacology ; Organ Culture Techniques ; Spinal Cord/cytology/drug effects/*physiology
    Print ISSN: 0036-8075
    Electronic ISSN: 1095-9203
    Topics: Biology , Chemistry and Pharmacology , Computer Science , Medicine , Natural Sciences in General , Physics
    Published by American Association for the Advancement of Science (AAAS)
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