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  • 1
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    Opiate peptide modulation of amino acid responses suggests novel form of neuronal communication (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-03-31
    Description: Mouse spinal neurons grown in tissue culture were used to study the electrophysiological pharmacology of the opiate peptide leucine-enkephalin. Enkephalin depressed glutamate-evoked responses in a noncompetitive manner independent of any other effects on membrane properties. The results demonstrate a neuromodulatory action of opiate peptide functionally distinct from the conventional neurotransmitter class of operation.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Barker, J L -- Neale, J H -- Smith, T G Jr -- Macdonald, R L -- New York, N.Y. -- Science. 1978 Mar 31;199(4336):1451-3.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/204016" target="_blank"〉PubMed〈/a〉
    Keywords: Cells, Cultured ; Endorphins/*pharmacology ; Enkephalins/antagonists & inhibitors/*pharmacology ; Excitatory Amino Acid Antagonists ; Glutamates/*pharmacology ; Iontophoresis ; Naloxone/pharmacology ; Neurons/*drug effects ; Spinal Cord ; Synapses/*drug effects ; Synaptic Transmission/*drug effects
    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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    Different actions of anticonvulsant and anesthetic barbiturates revealed by use of cultured mammalian neurons (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-05-19
    Description: Barbiturate anesthetics, but not anticonvulsants, abolish the spontaneous activity of cultured spinal cord neurons; directly increase membrane conductance, an effect which is suppressed by the gamma-aminobutyric acid (GABA) antagonists picrotoxin and penicillin; and are more potent than anticonvulsants in augmenting GABA and depressing glutamate responses. Barbiturate anticonvulsants abolish picrotoxin-induced convulsive activity. These results indicate qualitative and quantitative differences between anesthetic and anticonvulsant barbiturates, which may explain their different clinical effects.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Macdonald, R L -- Barker, J L -- New York, N.Y. -- Science. 1978 May 19;200(4343):775-7.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/205953" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials/drug effects ; Cells, Cultured ; Electric Conductivity ; Glutamates/pharmacology ; Membrane Potentials/drug effects ; Neurons/*drug effects ; Pentobarbital/*pharmacology ; Phenobarbital/*pharmacology ; Picrotoxin/pharmacology ; Receptors, Neurotransmitter/drug effects ; gamma-Aminobutyric Acid/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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  • 3
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    Specific-opiate-induced depression of transmitter release from dorsal root ganglion cells in culture (1978)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1978-03-31
    Description: The opiate etorphine depresses monosynaptic excitatory postsynaptic potentials (EPSP's) elicited in spinal cord cells by activation of dorsal root ganglion cells in murine neuronal cell culture. The depression is reversed by naloxone. Statistical analysis of the synaptic responses reveals that the opiate reduces EPSP quantal content at this synapse without altering quantal size. Therefore, the opiate action is presynaptic and affects transmitter release rather than postsynaptic responsiveness.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Macdonald, R L -- Nelson, P G -- New York, N.Y. -- Science. 1978 Mar 31;199(4336):1449-51.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/204015" target="_blank"〉PubMed〈/a〉
    Keywords: Cells, Cultured ; Depression, Chemical ; Dose-Response Relationship, Drug ; Etorphine/*pharmacology ; Ganglia, Spinal/*drug effects ; Membrane Potentials/drug effects ; Morphinans/*pharmacology ; Naloxone/pharmacology ; Nerve Endings/drug effects ; Spinal Cord/drug effects ; Synapses/drug effects ; Synaptic Transmission/*drug effects
    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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    Forskolin and phorbol esters reduce the same potassium conductance of mouse neurons in culture (1987)
    American Association for the Advancement of Science (AAAS)
    Details
    Publication Date: 1987-01-16
    Description: Second messenger systems may modulate neuronal activity through protein phosphorylation. However, interactions between two major second messenger pathways, the cyclic AMP and phosphatidylinositol systems, are not well understood. The effects of activators of cyclic AMP-dependent protein kinase and protein kinase C on resting membrane properties, action potentials, and currents recorded from mouse dorsal root ganglion neurons and cerebral hemisphere neurons grown in primary dissociated cell culture were investigated. Neither forskolin (FOR) nor phorbol 12,13-dibutyrate (PDBu) altered resting membrane properties but both increased the duration of calcium-dependent action potentials in both central and peripheral neurons. By means of the single-electrode voltage clamp technique, FOR and PDBu were shown to decrease the same voltage-dependent potassium conductance. This suggests that two independent second messenger systems may affect the same potassium conductance.〈br /〉〈span class="detail_caption"〉Notes: 〈/span〉Grega, D S -- Werz, M A -- Macdonald, R L -- NS 07231/NS/NINDS NIH HHS/ -- NS 19613/NS/NINDS NIH HHS/ -- NS 19692/NS/NINDS NIH HHS/ -- New York, N.Y. -- Science. 1987 Jan 16;235(4786):345-8.〈br /〉〈span class="detail_caption"〉Record origin:〈/span〉 〈a href="http://www.ncbi.nlm.nih.gov/pubmed/2432663" target="_blank"〉PubMed〈/a〉
    Keywords: Action Potentials/*drug effects ; Animals ; Brain/cytology ; Calcium/physiology ; Cells, Cultured ; Colforsin/*pharmacology ; Electric Conductivity ; Ganglia, Spinal/cytology ; Ion Channels/physiology ; Membrane Potentials ; Mice ; Neurons/drug effects/*physiology ; Phorbol Esters/*pharmacology ; Potassium/*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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