Restoration of miR-451a-5p/miR-34a-5p could suppress the proliferation and migration of human breast cancer cells through Wnt/β- catenin and ERK/P-ERK signaling pathways

MicroRNAs (miRNAs) are a class of small non-coding RNAs of 21–25 nucleotides in length and display an essential role in regulating cancer initiation, development, and progression. Breast cancer (BC) is the most commonly detected malignancy in women, and it is one of the main motives of death worldwide. In this study, the impacts of microRNA-451a-5p and miR-34a-5p (tumor suppressors), individually and combined, transfections were conducted on the apoptosis, proliferation, and migration of breast cancer cells in vitro. For carrying out this research, malignant breast cancer cells (MDA-MB-231) were transfected with miR-451a-5p and miR-34a-5p mimics. Then, the cytotoxicity, apoptosis, proliferation, migration and, the protein and gene expression of caspase-3, caspase-8, MMP9, ROCK, vimentin, c-Myc of the cancer cells were assessed by MTT, flow cytometry, q-RT-PCR (expression levels of caspase-3, caspase-8, MMP9, ROCK, vimentin, c-Myc genes), wound healing, and western blot assays. The resluts indicated that the miR-34a-5p and miR-451a-5p could additionally induce apoptosis and cell cycle arrest in the sub-G1-phase, repress the proliferation and migration in the breast cancer cells, and could also decrease β- catenin, ERK/P-ERK protein expressions. The present data documented that restoring tumor suppressor miR-451/miR-34 in vitro strongly induced the programmed cell death and obviously inhibited the cell proliferation and migration in human breast cancer cells. Taken to gather, miR-451a and miR-34a have a considerable role in breast cancer cell proliferation and migration ability via Wnt/β-catenin and ERK/P-ERK signaling pathways. Therefore, the simultaneous restoration of the presented tumor suppressor miRNAs may be proposed as a valuable and potential therapeutic strategy in breast cancer treatment. However, further study should be meaningful.

Restoration of miR-451a-5p/miR-34a-5p could suppress the proliferation and migration of human breast cancer cells through Wnt/β- catenin and ERK/P-ERK signaling pathways Keywords:

Breast cancer , miR-451 , miR-34 , Migration , Apoptosis