Metabotropic glutamate receptors contribute to neocortical synaptic plasticity in vivo.
Metabotropic glutamate receptors (mGluRs) have been shown to be important for hippocampus-dependent memory, as well as activity-dependent synaptic plasticity in the hippocampus. In this study, we examined the role of mGluRs in the induction of two forms of activity-dependent synaptic plasticity, long-term potentiation (LTP) and long-term depression (LTD), in the neocortex of awake, freely-moving rats. The mGluR antagonist AIDA was administered during the induction of LTP or LTD in the motor cortex. There was a 50% reduction of LTP induced in the early component of the evoked response, but there was no effect on the late component and no effect on the induction of LTD. Thus, mGluRs contribute to at least one form of activity dependent synaptic plasticity in the neocortex.
Eckert
Michael J
MJ
Department of Psychology, McMaster University, 1280 Main Street West, Hamilton, Ontario, Canada L8S 4K1.
Racine
Ronald J
RJ
D000704:Analysis of Variance; D000818:Animals; D004307:Dose-Response Relationship, Radiation; D004558:Electric Stimulation / Q000379:methods; D007189:Indans / Q000494:pharmacology; D017774:Long-Term Potentiation / Q000187:drug effects / Q000528:radiation effects; D036881:Long-Term Synaptic Depression / Q000187:drug effects / Q000528:radiation effects; D008297:Male; D019579:Neocortex / Q000187:drug effects / Q000502:physiology* / Q000528:radiation effects; D009473:Neuronal Plasticity / Q000187:drug effects / Q000502:physiology* / Q000528:radiation effects; D051381:Rats; D020318:Rats, Long-Evans; D018094:Receptors, Metabotropic Glutamate / Q000037:antagonists & inhibitors / Q000502:physiology*; D014851:Wakefulness / Q000502:physiology
C095756:1-aminoindan-1,5-dicarboxylic acid; D007189:Indans; D018094:Receptors, Metabotropic Glutamate