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• W2034247339 abstract "Tumor necrosis factor-related apoptosis-inducing ligand (TRAIL) is promising for cancer treatment owing to its selective cytotoxicity against malignant cells. However, some cancer cell types, including malignant melanoma cells, are resistant to TRAIL-induced apoptosis. Therefore, drugs that can amplify TRAIL cytotoxicity are urgently required. Depolarization of the plasma membrane potential is associated with apoptosis induced by a variety of death-inducing agents but its role in apoptosis remains a matter of debate. We found that TRAIL treatment resulted in robust depolarization in human melanoma cells with a considerable lag (2-4 h). Moreover, membrane-depolarizing agents, including K+ and ATP-sensitive K+ (KATP) channel inhibitors glibenclamide and U37883A enhanced TRAIL-induced apoptosis. On the contrary, inhibitors of calcium- and voltage-dependent K+ channels and mitochondrial KATP channels had no such effects. Melanocytes were insensitive to TRAIL-induced depolarization and apoptosis as well as to the sensitization by membrane-depolarizing agents despite their substantial surface expression of death receptors. TRAIL induced robust activation of X-box-binding protein-1 and caspase-12, both of which were enhanced by the K+ and KATP channel inhibitors, but not by other K+ channel inhibitors. Finally, caspase-12-selective inhibitor completely abolished the amplification of apoptosis. These findings suggest that depolarization promotes endoplasmic reticulum stress-mediated death pathway, thereby amplifying TRAIL cytotoxicity. Thus, membrane-depolarizing agents such as KATP channel inhibitors may have therapeutic potential in the treatment of TRAIL-resistant cancer cells without impairing tumor-selectivity." @default.
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• W2034247339 date "2012-05-17" @default.
• W2034247339 modified "2023-09-27" @default.
• W2034247339 title "Depolarization potentiates TRAIL-induced apoptosis in human melanoma cells: Role for ATP-sensitive K+ channels and endoplasmic reticulum stress" @default.
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• W2034247339 doi "https://doi.org/10.3892/ijo.2012.1483" @default.
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