MiRNA-183-5p promotes cell proliferation and inhibits apoptosis in human breast cancer by targeting the PDCD4.

MicroRNAs are often aberrantly expressed in breast cancer and postulated to play a causal role in the onset and maintenance of breast cancer by binding to its target mRNA. Here, we evaluated the effects of miRNA-183-5p on cell proliferation and apoptosis which attempted to elucidate the potential role of miR-183-5p/PDCD4 axis in human breast cancer. We found that the miR-183-5p expression level was extremely promoted in breast cancer in comparison with the adjacent normal tissues. Overexpression of miR-183-5p significantly enhanced the cell proliferation and inhibited cell apoptosis in MCF-7 and MDA-MB-231 cells. Moreover, PDCD4 was predicted as a putative target of miR-183-5p by bioinformatic approaches, and miR-183-5p negatively regulated the expression of PDCD4. Furthermore, knockdown of PDCD4 suppressed expression of p21 and p27, which was consistent with the result of the attachment of miR-183-5p. These data collectively demonstrate that miR-183-5p exerts oncomiRs effects in breast cancer, and may have broad impacts on the field of using antimiRs as anti-cancer drugs for breast cancer.