Wip1 sensitizes p53-negative tumors to apoptosis by regulating the Bax/Bcl-xL ratio.

Abstract

Wip1 is a stress-response phosphatase that negatively regulates several tumor suppressors, including p53. In a sizeable fraction of tumors, overexpression or amplification of Wip1 compromises p53 functions; inhibition of Wip1 activity is an attractive strategy for improving treatment of these tumors. However, over half of human tumors contain mutations in the p53 gene or have lost both alleles. Recently, we observed that in cancer cells lacking wild type p53, reduction of Wip1 expression was ineffective, whereas, surprisingly, overexpression of Wip1 increased anticancer drug sensitivity. The increased sensitivity resulted from activation of the intrinsic pathway of apoptosis through increased levels of the pro-apoptotic protein Bax and decreased levels of the anti-apoptotic protein Bcl-xL. We showed that interaction of Wip1 and the transcription factor RUNX2, specifically through dephosphorylation of RUNX2 phospho-S432, resulted in increased expression of Bax. Interestingly, overexpression of Wip1 increased drug sensitivity only in the p53-negative tumor cells while protecting the wild type p53-containing normal cells from drug-induced collateral injury. Here, we provide evidence that Wip1 overexpression decreases expression of Bcl-xL through negative regulation of NFκB activity. Thus, Wip1 overexpression increases the sensitivity of p53-negative cancer cells to anticancer drugs by separately affecting Bax and Bcl-xL protein levels.

• Authors: Anastasia R Goloudina, Sharlyn J Mazur, Ettore Appella, Carmen Garrido, Oleg N Demidov
• Journal: Cell cycle (Georgetown, Tex.) (Cell Cycle) Vol. 11 Issue 10 Pg. 1883-7 (May 15 2012) ISSN: 1551-4005 [Electronic] United States
• PMID: 22544321 (Publication Type: Journal Article, Research Support, N.I.H., Intramural, Research Support, Non-U.S. Gov't)

Chemical References

• Antineoplastic Agents
• Core Binding Factor Alpha 1 Subunit
• NF-kappa B
• Transcription Factor RelA
• Tumor Suppressor Protein p53
• bcl-2-Associated X Protein
• bcl-X Protein
• PPM1D protein, human
• Phosphoprotein Phosphatases
• Protein Phosphatase 2C
• Cisplatin

Topics

• Antineoplastic Agents (pharmacology)
• Apoptosis (drug effects)
• Cell Cycle Checkpoints (drug effects)
• Cell Line, Tumor
• Cisplatin (pharmacology)
• Core Binding Factor Alpha 1 Subunit (metabolism)
• Humans
• NF-kappa B (metabolism)
• Phosphoprotein Phosphatases (genetics, metabolism)
• Phosphorylation
• Promoter Regions, Genetic
• Protein Phosphatase 2C
• Transcription Factor RelA (metabolism)
• Tumor Suppressor Protein p53 (genetics, metabolism)
• bcl-2-Associated X Protein (genetics, metabolism)
• bcl-X Protein (metabolism)