Here we report that in acutely isolated rat spinal dorsal horn neurons, the glycine receptor can be regulated by exogenous calcium/ calmodulin-dependent protein kinase II (CaM-KII). Intracellularly applied, the alpha-subunit of CaM-KII enhanced glycine receptor-activated current recorded with the use of the whole cell patch-clamp technique. This result suggests that the function of glycine receptor is modulated by CaM-KII, but the cellular mechanism underlying the enhancement of glycine receptor-activated current is still unknown.