| Membrane and action potential responses evoked by excitatory amino acids acting at N-methyl-D-aspartate receptors and non-N-methyl-D-aspartate receptors in the rat thalamus in vivo. | |
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MedLine Citation:
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PMID: 1658679 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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The membrane potential responses and firing patterns of rat thalamic neurons evoked by iontophoretically applied excitatory amino acids were recorded in vivo. All excitatory amino acids, including N-methyl-D,L-aspartate, evoked a membrane depolarization and a repetitive, regular pattern of action potential firing in the thalamus. Both non-nociceptive and nociceptive thalamic neurons responded to all agonists tested. Iontophoretic application of magnesium ions selectively antagonized responses to N-methyl-D,L-aspartate but did not convert the repetitive firing pattern into a burst firing pattern. In contrast, in the hippocampus, N-methyl-D,L-aspartate evoked a burst pattern of action potential firing associated with rhythmic depolarizing membrane potential shifts, similar to those seen by other workers in the hippocampus and in other brain regions. These findings are discussed in relation to the possibility that the regular firing pattern of spikes evoked by excitatory amino acids in the thalamus is primarily determined by the intrinsic membrane properties of thalamic neurons. |
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Authors:
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S A Eaton; T E Salt |
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Publication Detail:
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Type: Comparative Study; Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
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Title: Neuroscience Volume: 44 ISSN: 0306-4522 ISO Abbreviation: Neuroscience Publication Date: 1991 |
Date Detail:
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Created Date: 1991-12-05 Completed Date: 1991-12-05 Revised Date: 2006-11-15 |
Medline Journal Info:
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Nlm Unique ID: 7605074 Medline TA: Neuroscience Country: ENGLAND |
Other Details:
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Languages: eng Pagination: 277-86 Citation Subset: IM |
Affiliation:
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Department of Visual Science, Institute of Ophthalmology, London, U.K. |
Export Citation:
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APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
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Action Potentials Amino Acids / pharmacology* Animals Hippocampus / cytology, metabolism Magnesium / pharmacology Male Membrane Potentials Neurons / metabolism Piperazines / pharmacology Rats Rats, Inbred Strains Receptors, Amino Acid Receptors, Cell Surface / physiology* Receptors, N-Methyl-D-Aspartate / antagonists & inhibitors, physiology* Thalamus / cytology, metabolism* |
| Chemical | |
Reg. No./Substance:
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0/Amino Acids; 0/Piperazines; 0/Receptors, Amino Acid; 0/Receptors, Cell Surface; 0/Receptors, N-Methyl-D-Aspartate; 100828-16-8/3-(2-carboxypiperazin-4-yl)propyl-1-phosphonic acid; 7439-95-4/Magnesium |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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