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Deprecated: Implicit conversion from float 286.79999999999995 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Cancer+Res 2016 ; 76 (6): 1429-40 Nephropedia Template TP
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MCPIP1 selectively destabilizes transcripts associated with an anti-apoptotic gene expression program in breast cancer cells that can elicit complete tumor regression #MMPMID26833120
Lu W; Ning H; Gu L; Peng H; Wang Q; Hou R; Fu M; Hoft DF; Liu J
Cancer Res 2016[Mar]; 76 (6): 1429-40 PMID26833120show ga
The ability of cancer cells to evade apoptosis is dictated by a shift in the balance between pro- and anti-apoptotic gene expression programs. Monocyte chemotactic protein induced protein 1 (MCPIP1) is a zinc finger RNA binding protein with important roles in mediating inflammatory responses. Overexpression of MCPIP1 in different cancer cell types has been implicated in eliciting an antitumor response, but a direct role of MCPIP1 in apoptosis has not been established. In this study, we demonstrate that MCPIP1 functions as a potent tumor suppressor that induces apoptosis of breast tumor cells by selectively enhancing mRNA decay of anti-apoptotic gene transcripts including Bcl2L1, Bcl2A1, RelB, Birc3, and Bcl3. Mechanistically, MCPIP1 physically interacted with a stem-loop structure in the 3'UTR of these transcripts through its PIN domain, causing mRNA destabilization. Furthermore, we found that MCPIP1 expression was repressed in breast tumor cells, and overexpression of MCPIP1 induced apoptosis, whereas its depletion enhanced cancer cell proliferation. Moreover, MCPIP1 induction in vivo resulted in complete regression of established tumors and a significant reduction in metastatic disease. Notably, low MCPIP1 expression in tumor samples from breast cancer patients was strongly associated with poor survival over 13 years of follow up. Collectively, our results highlight MCPIP1 is a new tumor suppressor in breast cancer that induces cell death by tipping the balance in favor of pro-apoptotic gene expression.