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MiR200c targets IRS1 and suppresses prostate cancer cell growth
Author(s) -
Su Wenjing,
Xu Miao,
Chen Xueqin,
Nie Ling,
Chen Ni,
Gong Jing,
Zhang Mengni,
Su Zhengzheng,
Huang Lei,
Zhou Qiao
Publication year - 2015
Publication title -
the prostate
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.295
H-Index - 123
eISSN - 1097-0045
pISSN - 0270-4137
DOI - 10.1002/pros.22968
Subject(s) - du145 , prostate cancer , irs1 , cancer research , biology , cell growth , cancer , microbiology and biotechnology , endocrinology , biochemistry , genetics , lncap , insulin receptor , insulin resistance , insulin
Background The downregulation of the tumor suppressor miR200c plays important roles in many malignant tumors. This study aims to show that miR200c is a posttranscriptional regulator of insulin receptor substrate 1 (IRS1) and over‐expression of miR200c suppresses prostate cancer cell growth. Methods Bioinformatics analysis was used to show potential post‐translational regulation of IRS1 by miR200c. Dual reporter gene assays were chosen to test the binding of miR200c to the potential seed sequences in IRS1 3′UTR. RT‐PCR, Q‐PCR and western blot were applied to determine the regulation effect of miR200c on IRS1. CCK8 assay, soft agar assay, trypan blue exclusion assay and flow cytometric analysis were used to measure the biological effects of miR200c on prostate cancer cell proliferation and apoptosis. Results The 449–455 nt, 3061–3067 nt, and 3096–3102 nt of the IRS1 3′‐UTR were identified as three potential seed sequences for miR200c. MiR200c directly binds to IRS1 through the seed sequences in IRS1 3′‐UTR. Artificial overexpression of miR200c significantly downregulated the mRNA and protein levels of IRS1, together with decreased cell proliferation and increased cell death of PC3 and DU145 cells. Conclusions Our results suggest that miR200c plays crucial roles in prostate cancer by post‐transcriptional regulation of IRS1. The mir200c/IRS1 pathway may be a potential therapeutic target to prevent prostate cancer cell growth. Prostate 75:855–862, 2015 . © 2015 Wiley Periodicals, Inc.