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Multiple lysine mutations in the C-terminus of p53 make it resistant to degradation mediated by MDM2 but not by human papillomavirus E6 and induce growth inhibition in MDM2-overexpressing cells

Abstract

We have recently shown that lysine mutations in p53's putative C-terminal acetylation sites result in increased stability and cytoplasmic distribution of the p53 protein in a human lung cancer cell line. In the present study, we showed that when lysine residues 372, 373, 381, and 382 of p53 were substituted with alanine, the resulting A4 protein was resistant to MDM2-mediated proteosomal degradation but was highly sensitive to human papillomavirus E6-mediated proteolysis. When A4 and wild-type p53 were transfected into MDM2-overexpressing MCF-7 cells, A4 significantly reduced colony formation in vitro, when compared with wild-type p53. Our results suggest that A4 exerts a growth-inhibitory effect more efficiently than wild-type p53 does in cell lines that overexpress MDM2 and may therefore be a better therapeutic tool than wild-type p53 for certain cancers in which MDM2 is amplified or overexpressed.

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Acknowledgements

We thank Marjorie Johnson for her technical assistance, Kerry Wright, Ph.D. (Scientific Publications Dept.) for editing assistance, Carmelita Concepcion and Peggy James for preparation of this manuscript. This work was partially supported by grants from the National Cancer Institute and the National Institutes of Health (P01 CA78778-01A1) (JA Roth); SPORE (2P50-CA70970-04); a developmental grant from the NCI for the University of Texas MD Anderson Cancer Center SPORE (P50-CA70907) in lung cancer (T Mukhopadhyay), by gifts to the Division of Surgery, from Tenneco and Exxon for the Core Laboratory Facility; by the UT MD Anderson Cancer Center Support Core Grant (CA 16672); by a grant from the Tobacco Settlement Funds as appropriated by the Texas State Legislature (Project 8), the WM Keck Foundation, and a sponsored research agreement with Introgen Therapeutics, Inc. (SR93-004-1).

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Nakamura, S., Roth, J. & Mukhopadhyay, T. Multiple lysine mutations in the C-terminus of p53 make it resistant to degradation mediated by MDM2 but not by human papillomavirus E6 and induce growth inhibition in MDM2-overexpressing cells. Oncogene 21, 2605–2610 (2002). https://doi.org/10.1038/sj.onc.1205343

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