A Phospholipase C-Dependent Intracellular $Ca^{2+}$ Release Pathway Mediates the Capsaicin-Induced Apoptosis in HepG2 Human Hepatoma Cells 73

  • Published : 2005.01.01

Abstract

The effect of capsaicin on apoptotic cell death was investigated in HepG2 human hepatoma cells. Capsaicin induced apoptosis in time- and dose-dependent manners. Capsaicin induced a rapid and sustained increase in intracellular $Ca^{2+}$ concentration, and BAPTA, an intracellular $Ca^{2+}$ chelator, significantly inhibited capsaicin-induced apoptosis. The capsaicin-induced increase in the intracellular $Ca^{2+}$ and apoptosis were not significantly affected by the extracellular $Ca^{2+}$ chelation with EGTA, whereas blockers of intracellular $Ca^{2+}$ release (dantrolene) and phospholipase C inhibitors, U-73122 and manoalide, profoundly reduced the capsaicin effects. Interestingly, treatment with the vanilloid receptor antagonist, capsazepine, did not inhibit either the increased capsaicin-induced $Ca^{2+}$ or apoptosis. Collectively, these results suggest that the capsaicin-induced apoptosis in the HepG2 cells may result from the activation of a PLC-dependent intracellular $Ca^{2+}$ release pathway, and it is further suggested that capsaicin may be valuable for the therapeutic intervention of human hepatomas.

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