The Oncoprotein SS18-SSX1 Promotes p53 Ubiquitination and Degradation by Enhancing HDM2 Stability
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1.6 BIOLOGICAL SCIENCES
Mutations of the p53 gene are uncommon in synovial sarcoma, a high-grade tumor genetically characterized by the chromosomal translocation t:(X;18), which results in the fusion of SS18 with members of SSX gene family. Although implicated in tumorigenesis, the mechanisms by which SS18-SSX promotes tumor growth and cell survival are poorly defined. Here, we show that SS18-SSX1 negatively regulates the stability of the tumor suppressor p53 under basal conditions. Overexpression of SS18-SSX1 enhanced p53 ubiquitination and degradation in a manner dependent on the ubiquitin ligase activity of HDM2. The negative effect of SS18-SSX1 expression on p53 was mediated by its ability to promote HDM2 stabilization through inhibition of HDM2 autoubiquitination. Furthermore, SS18-SSX1 expression altered the induction of p53-regulated genes in response to cellular stress by abrogating the transactivation of HDM2, PUMA, and NOXA but not p21. Our data uncover a novel mechanism whereby SS18-SSX1 can negatively regulate p53 tumor-suppressive function by increasing the stability of its negative regulator HDM2 and suggest that chemical compounds that target the p53-HDM2 regulatory axis may be of therapeutic benefit for the treatment of synovial sarcoma.
D'Arcy, P.B., Maruwge, W. & Ryan, B.A. (2008). The Oncoprotein SS18-SSX1 Promotes p53 Ubiquitination and Degradation by Enhancing HDM2 Stability. Molecular Cancer Research vol. 6, no. 1, pg. 127-38. doi:10.1158/1541-7786.MCR-07-0176