Abstract
Increasing evidence links the abnormal expression of microRNAs and ATP-binding cassette subfamily C member 4 (ABCC4) with tumor development and progression, as well as with chemoresistance. Our aims were to determine the therapeutic potential of targeting both miR-124-3p and ABCC4 in breast cancer cells and to determine if duel targeting increased their sensitivity to chemotherapeutic drugs, in vitro. The expression of the ABCC4 protein and miR-124-3p were detected, respectively, by immunohistochemical staining and quantitative real-time polymerase chain reaction in breast cancer tumor tissue, MCF-7 and MCF-7-ADR cell lines. Suppression of ABCC4 expression and miR-124-3p overexpression were performed in MCF-7-ADR cell lines. Western blot assays were used to detect expression of ABCC4 and permeability glycoprotein 1/multi-drug resistance protein 1 (P-gp) in cells. Cell Counting Kit-8, flow cytometry, transwell, and scratch assays were conducted to detect cell proliferation, cell cycle, invasion, and migration of cells. We found that ABCC4 protein expression was significantly increased, while the miR-124-3p level was significantly decreased in breast cancer tissue and cell lines. Tumor size and clinical tumor node metastasis stag...Continue Reading
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