Glycinergic and GABAergic synaptic transmission are differentially affected by gephyrin in spinal neurons

In the present study, we have examined the physiological properties of synaptic currents mediated by GlyRs and GABA(A)Rs after culturing spinal neurons with a gephyrin antisense oligonucleotide. Application of gephyrin antisense, but not the sense, reduced the glycinergic mIPSC amplitude (similar to 50%) and frequency (similar to 85%), indicating the importance of gephyrin for GlyR anchoring at postsynaptic sites. On the other hand, the glycine-evoked current amplitude was unchanged indicating that functional GlyRs were still located in the extrasynaptic membrane. The analysis of the GABAergic transmission in the same neurons revealed similar to 70% reduction in the frequency of the GABAergic mIPSCs, without changes in the amplitude. Interestingly, the modulation of remaining GABA(A)R-mediated synaptic events by zinc and diazepam was significantly altered by the antisense. These results indicate that gephyrin is required for the membrane insertion/ stabilization of the GABA(A)R gamma 2 subunit as well as for its subsequent localization in the postsynaptic membrane. (C) 2005 Published by Elsevier B.V.