mGluR-LTP promoted by vision after DR depends on PKC activity and intact protein synthesis. A, Protein synthesis inhibitors blocked APV-unmasked LTP (filled triangles represent cycloheximide; open circles represent anisomycin; filled circles represent APV). B, PKC inhibitors blocked APV-unmasked LTP (filled triangles represent CGP 41251; open circles represent bisindolylmaleimide II; filled circles represent APV). C, PKA inhibitor did not block APV-unmasked LTP (filled circles represent APV; open circles represent PKI). D, CaMKII inhibitor blocked APV-unmasked LTP (filled circles represent APV; open circles represent AIP).