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자료유형
학술저널
저자정보
Song, Young-Jin (Departments of Neurosurgery, Dong-A University College of Medicine) Bae, Hae-Rahn (Departments of Physiology, Dong-A University College of Medicine) Ha, Se-Un (Departments of Physiology, Dong-A University College of Medicine) Huh, Jae-Taeck (Departments of Neurosurgery, Dong-A University College of Medicine)
저널정보
대한신경외과학회 대한신경외과학회지 대한신경외과학회지 제41권 제1호
발행연도
2007.1
수록면
30 - 38 (9page)

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Objective : To elucidate the role of aquaporin-4[AQP4] in cerebral edema formation, we studied the expression and subcellular localization of AQP4 in astrocytes after focal cerebral ischemia. Methods : Cerebral ischemia were induced by permanent middle cerebral artery[MCA] occlusion in rats and estimated by the discoloration after triphenyltetrazolium chloride[TTC] immersion. Change of AQP4 expression were evaluated using western blot. Localization of AQP4 was assessed by confocal microscopy and its interaction with ${\alpha}-syntrophin$ was analyzed by immunoprecipitation. Results : After right MCA occlusion, the size of infarct and number of apoptotic cells increased with time. The ratio of GluR1/GluR2 expression also increased during ischemia. The polarized localization of AQP4 in the endfeet of astrocytes contacting with ventricles, vessels and pia mater was changed into the diffuse distribution in cytoplasm. The interactions of AQP4 and Kir with ${\alpha}-syntrophin$, an adaptor of dystrophin complex, were disrupted by cerebral ischemia. Conclusion : The deranged spatial buffering function of astrocytes due to mislocalized AQP4/Kir4.1 channel as well as increased assembly of $Ca^{2+}$ permeable AMPA receptors might contribute to the development of edema formation and the excitotoxic neuronal cell death during ischemia.

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