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Abnormal opening of Cx43 hemichannels after ischemic insults causes apoptotic cell death. In this study, we found persistently increased expression of Cx43 8 h to 7 d after hypoxia\/ischemia (HI) injury in neonatal rats. Pre\u2010treatment with Gap26 and Gap27, two Cx43 mimetic peptides, significantly reduced cerebral infarct volume. Gap26 treatment at 24 h after ischemia improved functional recovery on muscle strength, motor coordination, and spatial memory abilities. Further, Gap26 inhibited Cx43 expression and reduced active astrogliosis. Gap26 interacted and co\u2010localized with Cx43 together in brain tissues and cultured astrocytes. After oxygen glucose deprivation, Gap26 treatment reduced the total Cx43 level in cultured astrocytes; but Cx43 level in the plasma membrane was increased. Degradation of Cx43 in the cytoplasm was mainly via the ubiquitin proteasome pathway. Concurrently, phosphorylated Akt, which phosphorylates Cx43 on Serine<jats:sup>373<\/jats:sup> and facilitates the forward transport of Cx43 to the plasma membrane, was increased by Gap26 treatment. Microdialysis showed that increased membranous Cx43 causes glutamate release by opening Cx43 hemichannels. Extracellular glutamate concentration was significantly decreased by Gap26 treatment <jats:italic>in vivo<\/jats:italic>. Finally, we found that cleaved caspase\u20103, an apoptosis marker, was attenuated after HI injury by Gap26 treatment. Effects of Gap27 were analogous to those of Gap26. In summary, our findings demonstrate that modulation of Cx43 expression and astroglial function is a potential therapeutic strategy for ischemic brain injury. 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