Ischemia enhanced release of endogenous neuroactive amino acids from cerebellar and cerebral cortical slices. More glutamate was released in adult than developing mice. Taurine release enhanced by K+ stimulation and ischemia was more than one magnitude greater than that of GABA or glutamate in the developing cerebral cortex and cerebellum, while in adults the releases were almost comparable. Aspartate release was prominently enhanced by both ischemia and K+ stimulation in the adult cerebral cortex. In the cerebellum K+ stimulation and ischemia evoked almost 10-fold greater GABA release in 3-month olds than in 7-day olds. The release of taurine increased severalfold in the cerebellum of 7-day-old mice in high-K+ media, whereas the K+-evoked effect was rather small in adults. In 3-month-old mice no effects of K+ stimulation or ischemia were seen in the release of aspartate, glycine, glutamine, alanine, serine, or threonine. The releases from the cerebral cortex and cerebellum were markedly different and also differed between developing and adult mice. In developing mice only the release of inhibitory taurine may be large enough to counteract the harmful effects of excitatory amino acids in ischemia in both cerebral cortex and cerebellum, in particular since at that age the release of glutamate and aspartate cannot be described as massive. 1. Introduction Glutamate and γ-aminobutyrate (GABA) are the two major amino acid transmitters in the cerebral cortex and cerebellum, glutamate being responsible for excitatory and GABA for inhibitory transmission [1]. In these higher brain regions glycine was earlier assumed to be only an obligatory cotransmitter in the excitatory N-methyl-D-aspartate- (NMDA-) sensitive glutamate receptors, but more recent studies have also demonstrated the existence and function of strychnine-sensitive inhibitory glycine receptors in these structures [2, 3]. In addition to these established neurotransmitters, taurine also affects neuronal activity as an inhibitory modulator [4]. In the rodent brain the concentrations of taurine are high. In particular, in the developing brain it is the most abundant amino acid, even exceeding the concentration of glutamate [5]. The excessive extracellular accumulation of excitatory amino acids, predominantly that of glutamate but also of aspartate, in ischemia leads to cellular damage in the brain [6, 7]. Their massive release activates glutamate receptors, in particular those of the NMDA class [8], which leads to an excessive influx of Ca2+ and consequent adverse effects [9]. This excitotoxicity may
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