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Medium spiny neurons were recorded from striatal slices obtained from mice lacking the group I metabotropic glutamate receptor (mGluR) subtype 1 or subtype 5. In wild-type animals, N-methyl-D-aspartate (NMDA)-induced membrane depolarization/inward currents were potentiated in the presence of both the group I mGluR agonist 3,5-dihydroxyphenylglycine (3,5-DHPG) and the mGluR5 selective agonist (RS)-2-chloro-5-hydroxyphenylglycine...
The group I mGluR agonist (S)-3,5-dihydroxyphenylglycine (3,5-DHPG) and the mGluR5 agonist 2-chloro-5-hydroxyphenylglycine both induced a membrane depolarisation of striatal cholinergic interneurons. The response to 3,5-DHPG was blocked only by the coadministration of mGluR1 and mGluR5 antagonists, suggesting that both mGluRs are involved in this excitatory effect in striatal cholinergic interneurons.
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