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The 16-membered macrolide FD-891 exerts cytotoxicity toward several cancer cell lines. In this study, we showed that FD-891 induces apoptosis in various human cancer cell lines. Human leukemia Jurkat cells were highly sensitive to FD-891, exhibiting caspase activation and mitochondrial release of cytochrome c into the cytosol at early time points after exposure to FD-891. By contrast, Jurkat cells deficient in caspase-8 were resistant to FD-891-induced apoptosis and manifested little induction of cytochrome c release as well as caspase-9 processing. Consistent with these results, the overexpression of the Bcl-2 family member Bcl-x(L) or the caspase-8 modulator c-FLIP(L) markedly prevented FD-891-induced apoptosis. These results clearly demonstrate that FD-891 triggers caspase-8-dependent mitochondrial release of cytochrome c and subsequent apoptosis in Jurkat cells.

journal of antibiotics

The cytotoxic macrolide FD-891 induces caspase-8-dependent mitochondrial release of cytochrome c and subsequent apoptosis in human leukemia Jurkat cells