The systemic administration of kainate (10 mg/ml) into adult Wistar rats produces seizures and neurodegeneration. We have studied the effect of kainate administration on cPLA(2) and COX-2 immunoreactivities after 3 days and 1, 2, 4 and 11 weeks. The cPLA(2) immunoreactivity was increased in hippocampal neurons at 1 and 3 days after kainate injection suggesting that PLA, may be involved in neurodegeneration. Increased cPLA(2) and COX-2 immunoreactivities in astrocytes at 1, 2, 4 and 11 weeks after kainate injection indicate an adaptive astrocytic response that may be associated with gliosis. (C) 1998 Elsevier Science B.V.