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• W2069458976 abstract "We previously reported that the USP19 deubiquitinating enzyme positively regulates proliferation in fibroblasts by stabilizing KPC1, a ubiquitin ligase for p27(Kip1). To explore whether this role of USP19 extends to other cellular systems, we tested the effects of silencing of USP19 in several human prostate and breast models, including carcinoma cell lines. Depletion of USP19 inhibited proliferation in prostate cancer DU145, PC-3 and 22RV1 cells, which was similar to the pattern established in fibroblasts in that it was due to decreased progression from G1 to S phase and associated with a stabilization of the cyclin-dependent kinase inhibitor p27(Kip1). However, in contrast to previous findings in fibroblasts, the stabilization of p27(Kip1) upon USP19 depletion was not associated with changes in the levels of the KPC1 ligase. USP19 could also regulate the growth of immortalized MCF10A breast epithelial cells through a similar mechanism. This regulatory pattern was lost, though, in breast cancer MCF7 and MDA-MB-231 cells and in prostate carcinoma LNCaP cells. Of interest, the transformation of fibroblasts through overexpression of an oncogenic form of Ras disrupted the USP19-mediated regulation of cell growth and of levels of p27(Kip1) and KPC1. Thus, the cell context appears determinant for the ability of USP19 to regulate cell proliferation and p27(Kip1) levels. This may occur through both KPC1 dependent and independent mechanisms. Moreover, a complete loss of USP19 function on cell growth may arise as a result of oncogenic transformation of cells." @default.
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• W2069458976 date "2011-01-17" @default.
• W2069458976 modified "2023-09-23" @default.
• W2069458976 title "Identification of Distinctive Patterns of USP19-Mediated Growth Regulation in Normal and Malignant Cells" @default.
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• W2069458976 doi "https://doi.org/10.1371/journal.pone.0015936" @default.
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