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학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
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The neuronal cell death induced by excess glutamate (Glu) has been implicated in many acute and chronic neurodegenerative diseases including cerebral ischemia. Glu-induced elevation of intra-cellular $Ca^{2+}$ plays a critical role in the excitotoxicity, partly through the activation of a variety of $Ca^{2+}$ dependent enzymes. In the present study, we investigated the Glu-induced modulation of $Ca^{2+}$/calmodulin-dependent protein kinase IV (CaMK IV), a multifunctional enzyme abundantly present in the nuclei of neurons. The exposure of cultured rat cortical neurons to $100{\mu}$M Glu for 3 min dramatically increased CaMK IV activity up to 4.5-fold of the control-treated enzyme activity. The activation was very rapid, reaching peak at 3 min and then declined gradually. Under the same experimental conditions, time-dependent acute and delayed neuronal cell death was observed. Immunoblot analyses using specific antibodies showed that the expressions of CaMK IV and $CaMKK_{\alpha}$ were time-dependently modulated by Glu. Taken together, these results imply that the modulation of CaMK IV activity by Glu may be involved in the cascade of events resulting in neuronal cell death in cortical cultures.
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