Abstract
Colorectal cancer is one of the most common malignant tumors worldwide with rising incidence. MicroRNAs are small non-coding RNAs that implicate in multiple physiological or pathological processes. The aberrant expression of miRNA-215 (miR-215) has been illustrated in various types of cancers. However, the expression of miR-215 in human colon cancer and the biological roles of it remain largely unknown. We conducted this study to explore the expression and the function of miR-215 in human colon cancer. The results showed that miR-215 was remarkably downregulated in colon cancer tissues and cell lines. Overexpression of miR-215 by miR-215 mimic significantly inhibited colon cancer cell proliferation, migration and invasion while knockdown of miR-215 by miR-215 inhibitor exerted reverse effects. Furthermore, we newly identified Yin-Yang 1(YY1) as a direct target of miR-215 which could rescue the effects of miR-215 on colon cancer cells. In summary, our investigation revealed that miR-215 was downregulated in colon cancer and it suppressed colon cancer cell proliferation, migration and invasion by directly targeting YY1.
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