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Deprecated: Implicit conversion from float 231.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Cell+Rep 2016 ; 15 (7): 1493-504 Nephropedia Template TP
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Direct upregulation of STAT3 by microRNA-551b-3p deregulates growth and metastasis of ovarian cancer #MMPMID27160903
Cell Rep 2016[May]; 15 (7): 1493-504 PMID27160903show ga
3q26.2 amplification in high-grade serous ovarian cancer leads to increased expression of mature microRNA miR551b-3p, which is associated with poor clinical outcome. Importantly, miR551b-3p contributes to resistance to apoptosis and increased survival and proliferation of cancer cells in vitro and in vivo. miR551b-3p up-regulates STAT3 protein levels with STAT3 being required for the effects of miR551b-3p on cell proliferation. Rather than decreasing levels of target mRNA as expected, we demonstrate that miR551b-3p binds a complementary sequence on the STAT3 promoter recruiting RNA Polymerase II and the TWIST1 transcription factor to activate STAT3 transcription and thus directly upregulates STAT3 expression. Furthermore, anti-miR551b reduced STAT3 expression in ovarian cancer cells in vitro and in vivo and reduced ovarian cancer growth in vivo. Together our data demonstrates a role for miR551b-3p in transcriptional activation. Thus miR551b-3p represents a promising candidate biomarker and therapeutic target in ovarian cancer.