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- W2000255289 abstract "Previous studies have demonstrated that the proapoptotic protein Bax plays an important role in the elevated enterocyte apoptosis that occurs during the intestinal adaptation response to massive small bowel resection (SBR). Additionally, epidermal growth factor receptor (EGFR) activation prevents SBR-induced enterocyte apoptosis. The present study aims to delineate the relationship between EGFR activity and intestinal epithelial cell apoptosis. Treatment of model intestinal epithelial cells (RIEC-18) with both a selective EGFR inhibitor (ZD1839) and EGFR small interfering RNA knockdown resulted in a dramatic increase in apoptosis, accompanied by rapid phosphorylation of p38alpha. Concurrently, Bax underwent conformational changes consistent with activation and translocated to mitochondria. In contrast, EGF stimulation enhanced cell survival by attenuating p38alpha phosphorylation, Bax conformational change, mitochondrial trafficking, and apoptosis. These results demonstrate that that diminished EGFR activity initiates the intrinsic pathway of apoptosis through p38alpha-dependent Bax activation in intestinal epithelial cells. These finding provide mechanistic insight into the role that EGFR signaling plays in the regulation of enterocyte apoptosis following massive intestinal loss." @default.
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- W2000255289 date "2007-09-01" @default.
- W2000255289 modified "2023-10-09" @default.
- W2000255289 title "Epidermal growth factor receptor signaling modulates apoptosis via p38α MAPK-dependent activation of Bax in intestinal epithelial cells" @default.
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- W2000255289 doi "https://doi.org/10.1152/ajpgi.00182.2007" @default.
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