Abstract
Doxorubicin (DOX)-induced apoptosis is suppressed by p21 (waf1/cip1/sdi1), a cyclin dependent kinase (CDK) inhibitor. Here we show that exogenous expression of p21 before, but not after, the DOX-treatment protected p21-deficient human colorectal cancer cell line DLD1 from DOX-induced apoptosis. In previous work, we demonstrated that p21 inhibits DOX-induced apoptosis via its CDK-binding and CDK-inhibitory activity. Here we report that pre-existing p21 can associate with pro-caspase-3 and inhibit caspase-3 activation in the cells, which was at least in part responsible for enhancing survival of DOX-treated cells. Furthermore, the N-terminal domain of p21 was found to interact with pro-caspase-3 in DLD1 cells. Thus, we propose that pre-existing p21 is required to prevent DOX-induced apoptosis.
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Tang, J.J., Shen, C. & Lu, Y.J. Requirement for pre-existing of p21 to prevent doxorubicin-induced apoptosis through inhibition of caspase-3 activation. Mol Cell Biochem 291, 139–144 (2006). https://doi.org/10.1007/s11010-006-9206-7
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DOI: https://doi.org/10.1007/s11010-006-9206-7