Role of the tripartite motif protein 27 in cancer development.

Journal of the National Cancer Institute
Georgia ZoumpoulidouSibylle Mittnacht

Abstract

The tripartite motif family protein 27 (TRIM27) is a transcriptional repressor that interacts with, and attenuates senescence induction by, the retinoblastoma-associated protein (RB1). High expression of TRIM27 was noted in several human cancer types including breast and endometrial cancer, where elevated TRIM27 expression predicts poor prognosis. Here, we investigated the role of TRIM27 expression in cancer development. We assessed TRIM27 expression in human cancer using cancer profiling arrays containing paired tumor and normal cRNA (n = 261) as well as in murine skin cancer induced by 7, 12-dimethylbenzanthracene (DMBA)/12-O-tetradecanoylphorbol-13-acetate (TPA). We generated mice with disrupted expression of murine TRIM27 (Trim27(-/-)) and assessed their susceptibility to DMBA/TPA-induced skin tumor development compared with isogenic littermates (n = 26 mice per group). We assessed the effect of Trim27 loss on senescence propensity in mouse embryonic fibroblasts (MEFs) by quantifying cell proliferation alongside senescence markers (senescence-associated β-galactosidase [SA-β-gal] activity and hypertrophic cell morphology). The contribution of RB1 on senescence and cancer susceptibility (n > 20 mice per group) in Trim27(-/-)...Continue Reading

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