Deletion of interstitial genes between TMPRSS2 and ERG promotes prostate cancer progression
Menée à l'aide de modèles murins de cancer de la prostate, cette étude met en évidence des mécanismes par lesquels la perte du gène Ets2 et de divers autres gènes, situés à l'intérieur de la région génomique délimitée par les gènes TMPRSS2 et ERG, favorise la progression tumorale
TMPRSS2-ERG gene fusions that occur frequently in human prostate cancers can be generated either through insertional chromosomal rearrangement or by intrachromosomal deletion. Genetically, a key difference between these two mechanisms is that the latter results in deletion of a ~3Mb interstitial region containing genes with unexplored roles in prostate cancer. In this study, we characterized two mouse models recapitulating TMPRSS22-ERG insertion or deletion events in the background of prostate-specific PTEN deficiency. We found that only the mice which lacked interstitial region developed prostate adenocarcinomas marked by poor differentiation and epithelial-to-mesenchymal transition. Mechanistic investigations identified several interstitial genes, including Ets2 and Bace2, whose reduced expression correlated in the gene homologs in human prostate cancer with biochemical relapse and lethal disease. Accordingly, PTEN-deficient mice with prostate-specific knockout of Ets2 exhibited marked progression of prostate adenocarcinomas that was partly attributed to activation of MAPK signaling. Collectively, our findings established that Ets2 is a tumor suppressor gene in prostate cancer and its loss along with other genes within the TMPRSS2-ERG interstitial region contributes to disease progression.
Cancer Research 2016