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Deprecated: Implicit conversion from float 253.2 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Am+J+Cancer+Res 2017 ; 7 (3): 628-46 Nephropedia Template TP
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miR-495 promotes the chemoresistance of SCLC through the epithelial-mesenchymal transition via Etk/BMX #MMPMID28401017
Wei T; Zhu W; Fang S; Zeng X; Huang J; Yang J; Zhang J; Guo L
Am J Cancer Res 2017[]; 7 (3): 628-46 PMID28401017show ga
miR-495 serves as an oncogenic miRNA or a tumor suppressor in different types of cancer. However, its role in the drug resistance of small cell lung cancer (SCLC) remains unidentified. In this study, we investigated whether miR-495 regulates the chemoresistance of SCLC through the epithelial-mesenchymal transition (EMT) via Epithelial and endothelial tyrosine kinase (Etk/BMX) using two drug-resistant cell lines. Loss- and gain-of-function experiments showed miR-495 regulated cell proliferation, tumor growth and drug resistance. miR-495 suppression or Etk/BMX elevation in SCLC specimens was correlated with poor pathologic stage and survival time. Etk/BMX was one of the directly targeted genes of miR-495. Ectopic expression of Etk/BMX obviously rescued the miR-495 elevation elevation-induced inhibition of drug resistance. Etk/BMX over-expression led to higher levels of EMT mesenchymal factors (Zeb-2, Twist, Vim) and lower levels of the epithelial molecule ?-catenin, while suppression of Etk/BMX showed the opposite trend. Knockdown of Zeb-2 and Twist inhibited the chemoresistance of cells. Our study revealed that miR-495 promoted the chemoresistance of SCLC through the epithelial-mesenchymal transition via Etk/BMX. miR-495 re-expression or Etk/BMX depletion is a promising strategy for interfering with chemoresistance in SCLC.