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A massive striatal dopamine release (241-fold increase) was observed in a previous study during acute cerebral ischemia in rats. In this study, extracellular levels of glutamic acid (GLU), gamma-aminobutyric acid (GABA) and lactic acid were simultaneously determined using in vivo brain dialysis in the striatum of spontaneously hypertensive rats during cerebral ischemia and after recirculation. Extracellular GABA levels increased to 932 +/- 75% (mean +/- SEM) of the resting level and GLU increased to 390 +/- 63% during 20 min ischemia. Although ischemia-induced release of GLU and GABA was demonstrated in this study, the degree of increase was smaller than that of dopamine. These findings may be relevant to the pathophysiology of cerebral ischemia in the striatum.

Striatal glutamic acid and .GAMMA.-aminobutyric acid in transient cerebral ischemia in spontaneously hypertensive rats.