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- W2098452001 abstract "Intracellularly, the anticancer drug taxol induces tubulin polymerization and mitotic arrest, followed by apoptosis. The DNA repair enzyme poly(ADP-ribose) polymerase (PARP) and lamins are known to be degraded during apoptosis. PARP is a substrate for the Yama protease, which is encoded by the CPP32 beta/ Yama gene, whereas lamins are degraded by the Yama and lamin proteases. In the present studies, we determined the effects of enforced overexpression of the antiapoptosis Bcl-xL protein on taxol-mediated microtubule and cell cycle perturbations, as well as on taxol-induced apoptosis and associated Yama protease activity in human myeloid leukemia HL-60 cells. Our data demonstrate that high Bcl-xL levels do not affect the microtubular bundling or mitotic arrest due to taxol but significantly inhibit the morphological, flow cytometric, and DNA fragmentation features associated with taxol-induced apoptosis. This resulted in a significant improvement in the survival of taxol-treated cells that possess high Bcl-xL levels. In the control HL-60 cells, following taxol treatment, whereas the mRNA of Yama was not induced, taxol-induced apoptosis was associated with Yama activation and PARP as well as lamin B1 degradation. These features were blocked by coculture of these cells with the cysteine protease inhibitor YVAD-cmk as well as in cells with overexpression of Bcl-xL. These results suggest that Bcl-xL antagonizes taxol-induced apoptosis by a mechanism that interferes with the activation of a key protease involved in the execution of apoptosis." @default.
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- W2098452001 date "1996-08-01" @default.
- W2098452001 modified "2023-09-23" @default.
- W2098452001 title "Bcl-xL overexpression inhibits taxol-induced Yama protease activity and apoptosis." @default.
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