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MicroRNA-134 reverses multidrug resistance in human lung adenocarcinoma cells by targeting FOXM1.

Multidrug resistance (MDR) is the primary barrier to the success of chemotherapy for lung adenocarcinoma. MicroRNA (miR)-134, which is downregulated in lung adenocarcinoma, influences cell proliferation, apoptosis and invasion of lung adenocarcinoma. However, the function of miR-134 in the MDR of lung adenocarcinoma remains unclear. In the present study, it was identified that miR-134 expression is significantly downregulated in A549/cisplatin MDR lung adenocarcinoma cells, as compared with A549 parental cells. miR-134 regulates the sensitivity of lung adenocarcinoma cells to certain anticancer drugs. Furthermore, it was demonstrated that forkhead box M1 and multidrug resistance-associated protein 1 are functional targets of miR-134. These data revealed an important role for miR-134 in the regulation of MDR in lung adenocarcinoma.