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  • Title: Involvement of Bax, Bcl-2, Ca2+ and caspase-3 in capsaicin-induced apoptosis of human leukemia HL-60 cells.
    Author: Tsou MF, Lu HF, Chen SC, Wu LT, Chen YS, Kuo HM, Lin SS, Chung JG.
    Journal: Anticancer Res; 2006; 26(3A):1965-71. PubMed ID: 16827131.
    Abstract:
    The role of Ca2+ on the effects of capsaicin on human leukemia HL-60 cells in vitro and the molecular mechanisms of capsaicin-induced apoptosis were investigated. The flow cytometric analysis indicated that capsaicin decreased the percentage of viable HL-60 cells, via the induction of G0/G1-phase cell cycle arrest and apoptosis. Capsaicin-induced G0/G1-phase arrest involved the suppression of CDK2 and the cyclin E complex, which are check-point enzymes for cells moving from G0/G1- to S-phase. Capsaicin-induced apoptosis was associated with the elevation of intracellular reactive oxygen species and Ca2+ production, decreased the levels of mitochondrial membrane potential, promoted cytochrome c release and increased the activation of caspase-3. An intracellular Ca2+ chelator (BAPTA) significantly inhibited capsaicin-induced apoptosis. Capsaicin-induced apoptosis was time-and dose-dependent. These results suggest that the capsaicin-induced apoptosis of HL-60 cells may result from the activation of caspase-3 and the intracellular Ca2+ release pathway.
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