세라미드는 신장 상피세포에서 ERK의존성 미토콘드리아 세포자멸사 경로를 통해 사포사멸을 유도
Ceramide Induces Cell Death through an ERK-dependent Mitochondrial Apoptotic Pathway in Renal Epithelial Cells
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Abstract
Ceramide induces cell death in a variety of cell types however, the underlying molecular mechanisms related to renal epithelial cells remain unclear. The present study was undertaken to determine the role of extracellular signal-regulated protein kinase (ERK) in ceramide-induced cell death in renal epithelial cells. An established renal proximal tubular cell line of opossum kidney (OK) cells was used for this research. Ceramide induced apoptotic cell death in these cells. Western blot analysis showed that ceramide induced activation of ERK. The ERK activation and cell death induced by ceramide were prevented by the ERK inhibitor PD98059. Ceramide caused cytochrome C release from mitochondria into the cytosol as well as activation of caspase-3. Both effects were prevented by PD98059. The ceramide-induced cell death was also prevented by a caspase inhibitor. These results suggest that ceramide induces cell death through an ERK-dependent mitochondrial apoptotic pathway in OK cells.
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