STRIATAL GRAFTS IN THE ISCHEMIC STRIATUM IMPROVE PALLIDAL GABA RELEASE AND PASSIVE-AVOIDANCE

Fetal striatal cells were grafted into the ischemic striatum of rats and pallidal GABA release, and behavioral improvement were investigated. Intraluminal occlusion of the middle cerebral artery (MCA) for 1 h induced ischemic infarcts in the lateral striatum and the adjacent cortex. In ischemic rats, the performance of a passive avoidance task was disturbed, and the pallidal GABA level detected by microdialysis decreased to about a half of control. After the graft, the deficit in the passive avoidance was partially alleviated and the GABA level recovered moderately and increased further by the infusion of an uptake blocker. The data indicate that fetal striatal cell grafts in the ischemic striatum partially restored both chemical and behavioral deficits.