Abstract
Stroke or cerebrovascular accident reduces blood flow and decreases oxygen supply (ischemia) in brain tissue. This may be resulted from vascular obstruction when a blood vessel is blocked or by hemorrhage when bleeding occurs into the brain tissue. Decrease in oxygen supply shifts pH to acidosis and increases extracellular K+ concentration, which depolarizes neural cell membrane. Anoxic depolarization leads to excessive release of glutamate, which then activates various glutamate receptors in the synapse or the extrasynaptic space. Opening of ionotropic glutamate receptors (NMDA, AMPA and kainate receptors) causes influx of Na+ through the activated glutamate-gated ion channels. In response to anoxia, Ca2+ also enters the cells in excessive amounts via activated NMDA receptors and Ca2+-permeable AMPA receptors. This will lead to activation of several Ca2+-dependent intracellular signal transduction pathways (proteases, kinases, endonucleases, lipoxygeneses and nitric oxide synthase), which ultimately leads to neural death (Vizi et al., 1996; Parsons et al., 1998).
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Harsing, L.G. et al. (2004). Neurotransmitter Release in Experimental Stroke Models: The Role of Glutamate-Gaba Interaction. In: Vécsei, L. (eds) Frontiers in Clinical Neuroscience. Advances in Experimental Medicine and Biology, vol 541. Springer, Boston, MA. https://doi.org/10.1007/978-1-4419-8969-7_2
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DOI: https://doi.org/10.1007/978-1-4419-8969-7_2
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