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[Three types of miniature inhibitory potentiaes in the frog spinal cord motoneurons: the possibility of GABA and glycine co-release].

Miniature inhibitory postsynaptic potentials (mlPSPs) were recorded from motoneurons of the frog isolated spinal cord after blocking action potentials and ionotropic glutamate receptors (TTX 1 mcm: CNQX 25 mcm, D-AP5 50 mcm). Three types of mlPSPs were selected by their time characteristics) fast, slow and mlPSPs with two decay time constants. We classified 8.7% of mlPSPs as dual-component, 64.5% as fast mlPSPs, and 26.8% as slow mlPSPs. The GABA(A)R blocker bicuculline (20 mcm) diminished the number of the slow and dual-component events while the number of mlPSP with a fast kinetics was increased. The GlyR antagonist strychnine (1 mcm) reduced the frequency of fast mlPSPs and increased this parameter of slow mlPSPs. These data suggest existence of three different mlPSP groups distinguished by their kinetics and sensitivity to receptor antagonists: fast events mediated by glycine, slow events mediated by GABA and dual-component mlPSPs corresponding to glycine and GABA co-release.