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[Effects of microRNA-373 on the proliferation and invasiveness of breast carcinoma and its mechanisms].

Objective: To explore the effects of microRNA (miR)-373 on proliferation and invasion of breast cancer cells and its mechanisms. Methods: Breast carcinoma tissues and its corresponding normal tissues (80 cases) were obtained from the First Affiliated Hospital of Zhengzhou University from 2010 to 2014. Quantitative real-time (RT)-PCR was used to detect the expression of miR-373 of breast carcinoma tissues and its corresponding normal tissues. The cellula experiment was divided into three groups: the normal control group, the miR-373 mimic group and the miR-373 inhibitor group. The proliferation was detected by Cell Counting Kit.8 (CCK-8) method and the invasion and migration were detected by Transwell method. Effect of miR-373 on cell apoptosis was determined by Flow Cytometry. Results: Expression of miR-373 in breast cancer tissue was significant lower than the normal breast tissues (0.21±0.09 vs 0.98±0.23, P <0.001); expression of miR-373 contributed to the inhibition of Bcl-6 expression. The apoptosis rate in miR-373 was higher than normal control group (18.29%±0.29% vs 4.91%±0.31%), cell proliferation, cell invasion and cell migration were lower than normal control group [(0.69±0.11) vs (1.25±0.12) (the fifth day), (30.50±0.20) vs (66.50±0.42), (29.50±0.21) vs (48.50±0.31), all P <0.05]. Conclusion: miR-373 plays a suppressive role in proliferation and invasion of breast carcinoma, and the downregulation of miR-373 promotes the invasion of breast cancer which may mediate by the increased expression of Bcl-6.

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