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Cell Growth & Differentiation, Vol 9, Issue 1 79-84, Copyright © 1998 by American Association of Cancer Research


ARTICLES

mdm2 and bax, downstream mediators of the p53 response, are degraded by the ubiquitin-proteasome pathway

YC Chang, YS Lee, T Tejima, K Tanaka, S Omura, NH Heintz, Y Mitsui and J Magae
National Institute of Bioscience and Human-Technology, Tsukuba, Japan.

Upon activation in response to cellular stress or DNA damage, the p53 tumor suppressor induces the expression of gene products involved in cell cycle arrest and apoptosis. Using the proteasome-specific inhibitors, MG132 (N-acetyl-L-leucinyl-L-leucinal-L-leucinal) and lactacystin, here we show that the p53-response proteins, bax and mdm2 as well as p21, are degraded by the ubiquitin-proteasome pathway in HeLa cells. MG132 also increased expression of the three proteins in cells that lack p53, showing that stabilization of the p53 response proteins is not due to increased levels of p53 itself. Increases in mdm2 protein levels by MG132 was accompanied by increases in polyubiquitinated forms of the proteins. Our results indicate that ubiquitin-dependent protein degradation influences the turnover of downstream targets of p53, therefore suggesting that the proteasome plays a role in regulating apoptosis and cell cycle arrest in response to p53.


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Cancer Research Clinical Cancer Research
Cancer Epidemiology Biomarkers & Prevention Molecular Cancer Therapeutics
Molecular Cancer Research Cell Growth & Differentiation
Copyright © 1998 by the American Association of Cancer Research.