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Review
. 2015;57(12):847-54.

[NEGATIVE REGULATORS OF TUMOR SUPPRESSOR P53 IN THE CONTEXT OF ANTICANCER THERAPY]

[Article in Russian]
O Yu Shuvalov, O A Fedorova, A V Petukhov, A A Daks, E A Vasilieva, T A Grigorieva, G S Ivanov, N A Barlev
  • PMID: 26995961
Review

[NEGATIVE REGULATORS OF TUMOR SUPPRESSOR P53 IN THE CONTEXT OF ANTICANCER THERAPY]

[Article in Russian]
O Yu Shuvalov et al. Tsitologiia. 2015.

Abstract

P53 protein is considered to be the major tumor suppressor in human cells. Cancer cells do not survive if the p53-mediated signaling pathways function properly. However, about half of all malignancies still express wild type p53. One of the explanations to this is that p53 is suppressed by overexpression of p53-specific E3-ubiquitin ligases: Mdm2, MdmX, Pirh2 and Cop1. Pharmacological inhibition of protein-protein interactions between p53 and these negative regulators is a promising therapeutic approach to treat cancers retaining wild type p53. To date, a series of chemical inhibitors of p53 interactions with Mdm2 and MdmX E3-ubiquitin ligases have been discovered and characterized. Several of them are in the early stages of clinical trials. Despite this fact, their clinical efficacy may be hampered by a number of reasons, including tumor-specific expression of multiple isoforms of the target E3-ligases, which become inert to treatment with small molecules. This and other biochemical mechanisms of possible resistance of tumor cells with wild type p53 to small molecules against its negative regulators will be discussed in this review.

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