| Role of group II and III metabotropic glutamate receptors in rhythmic patterns of the neonatal rat spinal cord in vitro. | |
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MedLine Citation:
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PMID: 15007577 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
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Electrophysiological recordings were used to explore the role of group II and III metabotropic glutamate receptors (mGluRs) in oscillatory patterns generated by the neonatal rat spinal cord in vitro. Neither the group II agonist DCG-IV (and the selective antagonist EGLU), nor the group III agonist L-AP4 (and its selective antagonist CPPG) had any effect on lumbar motoneuron membrane potential or input resistance. This observation suggests that motoneurons expressed no functional group II and III mGluRs and received no network-based, tonic influence mediated by them. DCG-IV or L-AP4 strongly depressed synaptic responses evoked by single dorsal root (DR) stimuli, an effect counteracted by their respective antagonist. EGLU or CPPG per se had no effect on synaptic responses, indicating no mGluR autoreceptor-dependent control of transmitter release. L-AP4 largely depressed cumulative depolarization, windup and associated oscillations, whereas synaptic depression induced by DCG-IV waned with repeated stimuli. L-AP4 slowed down fictive locomotor patterns and arrested disinhibited bursting, which could, however, be promptly restored by DR electrical stimulation. DCG-IV had no significant effect on fictive locomotion, but it blocked disinhibited bursting. EGLU facilitated bursting, suggesting that burst termination was partly controlled by group II mGluRs. All these effects were reversible on washout. It is concluded that activation of group II and III mGluRs differentially modulated rhythmic patterns recorded from motoneurons via network-dependent actions, which probably included decrease in the release of neurotransmitters at key circuit points. |
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Authors:
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Giuliano Taccola; Cristina Marchetti; Andrea Nistri |
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Publication Detail:
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Type: In Vitro; Journal Article; Research Support, Non-U.S. Gov't Date: 2004-03-09 |
Journal Detail:
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Title: Experimental brain research. Experimentelle Hirnforschung. Expérimentation cérébrale Volume: 156 ISSN: 0014-4819 ISO Abbreviation: Exp Brain Res Publication Date: 2004 Jun |
Date Detail:
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Created Date: 2004-05-28 Completed Date: 2004-09-29 Revised Date: 2009-11-11 |
Medline Journal Info:
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Nlm Unique ID: 0043312 Medline TA: Exp Brain Res Country: Germany |
Other Details:
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Languages: eng Pagination: 495-504 Citation Subset: IM |
Affiliation:
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Neurobiology Sector and INFM Unit, International School for Advanced Studies (SISSA), Via Beirut 4, 34014 Trieste, Italy. |
Export Citation:
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| MeSH Terms | |
Descriptor/Qualifier:
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Action Potentials
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drug effects,
physiology Animals Animals, Newborn Biological Clocks / drug effects, physiology* Dose-Response Relationship, Drug Excitatory Amino Acid Agonists / pharmacology Excitatory Amino Acid Antagonists / pharmacology Locomotion / drug effects, physiology Motor Neurons / drug effects, physiology* Nerve Net / cytology, drug effects, physiology* Neural Inhibition / drug effects, physiology Organ Culture Techniques Periodicity Rats Receptors, Metabotropic Glutamate / agonists, antagonists & inhibitors, physiology* Spinal Cord / cytology, drug effects, physiology* Synaptic Transmission / drug effects, physiology |
| Chemical | |
Reg. No./Substance:
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0/Excitatory Amino Acid Agonists; 0/Excitatory Amino Acid Antagonists; 0/Receptors, Metabotropic Glutamate |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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