Synaptically stimulated induction of group i metabotropic glutamate receptor-dependent long-term depression and depotentiation is inhibited by prior activation of metabotropic glutamate receptors and PROTEIN KINASE C

We have investigated metaplasticity of the group I metabotropic glutamate receptor (mGluR)-dependent long-term depression (LTD) and depotentiation (DP) induced by physiological synaptic stimulation in the medial perforant path of the dentate gyrus in vitro. Group I mGluR-LTD/DP was inhibited by prior preconditioning brief high frequency stimulation (HFS) if the preconditioning HFS induced long-term potentiation (LTP) or if the induction of LTP was inhibited by an NMDA receptor antagonist. The inhibitory effect of the preconditioning HFS on LTD/DP was dependent upon activation of mGluRs, as it was blocked by the presence of the mGluR antagonist (S)-alpha-methyl-4-carboxyphenylglycine during the preconditioning stimulation. The inhibitory effect of the preconditioning HFS involved stimulation of PKC, as the presence of the PKC inhibitor bisindolylmaleimide (BIS) during the preconditioning stimulation prevented the inhibitory effect of such preconditioning stimulation. Activation of PKC was also necessary for the induction of mGluR-LTD itself, as the PKC inhibitor BIS prevented the induction of the mGluR-LTD. We suggest that the physiological stimulation of mGluRs by the preconditioning stimulation produces a PKC-dependent inactivation of subsequent group I mGluR functioning and thereby an inhibition of induction of group I mGluR-dependent LTD/DP induction.

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