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MiR-191 promotes tumorigenesis of human colorectal cancer through targeting C/EBP?.


ABSTRACT: MicroRNA-191 (miR-191), a small non-coding RNA, is involved in disease development and cancer diagnosis and prognosis. However, how miR-191 functions in colorectal cancer remains largely unclear. In this study, we show that miR-191 is highly expressed in colon tumor tissues, and that inhibition of miR-191 leads to decreased cell growth, proliferation and tumorigenicity in a xenograft model. Overexpression of miR-191 in colorectal cancer cell lines alters cell cycle progression and cell resistance to 5-Fu induced cell apoptosis. Mechanistic studies demonstrated that miR-191 directly binds to the 3'UTR of the C/EBP? mRNA and mediates a decrease in the mRNA and protein expression of C/EBP?. We further showed that C/EBP? induces growth arrest in a colorectal cancer cell line and that its expression is negatively correlated with the miR-191 level in patient samples. Our findings suggest that miR-191 may be a potential gene therapy target for the treatment of colorectal cancer.

SUBMITTER: Zhang XF 

PROVIDER: S-EPMC4414178 | biostudies-literature | 2015 Feb

REPOSITORIES: biostudies-literature

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miR-191 promotes tumorigenesis of human colorectal cancer through targeting C/EBPβ.

Zhang Xiao-Fei XF   Li Ke-ke KK   Gao Lu L   Li Shang-Ze SZ   Chen Ke K   Zhang Jun-Bin JB   Wang Di D   Tu Rong-Fu RF   Zhang Jin-Xiang JX   Tao Kai-Xiong KX   Wang Guobin G   Zhang Xiao-Dong XD  

Oncotarget 20150201 6


MicroRNA-191 (miR-191), a small non-coding RNA, is involved in disease development and cancer diagnosis and prognosis. However, how miR-191 functions in colorectal cancer remains largely unclear. In this study, we show that miR-191 is highly expressed in colon tumor tissues, and that inhibition of miR-191 leads to decreased cell growth, proliferation and tumorigenicity in a xenograft model. Overexpression of miR-191 in colorectal cancer cell lines alters cell cycle progression and cell resistanc  ...[more]

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