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Inhibition of AMPK-related kinase 5 (ARK5) enhances cisplatin cytotoxicity in non-small cell lung cancer cells through regulation of epithelial-mesenchymal transition #MMPMID28469776
Li M; Zheng C; Xu H; He W; Ruan Y; Ma J; Zheng J; Ye C; Li W
Am J Transl Res 2017[]; 9 (4): 1708-19 PMID28469776show ga
Lung cancer incidence and mortality rates are amongst the highest of all malignant tumors worldwide. ARK5 is a member of the human AMP-activated protein kinase (AMPK) family which is implicated in tumor survival and progression. The current study was designed to explore the role of ARK5 in resistance of non-small cell lung cancer (NSCLC) to cisplatin. We studied the sensitivity of two NSCLC cell lines, NCI-H1229 and A549, to cisplatin by using proliferation and cell viability assays. We then examined expression of ARK5, Twist, and the epithelial to mesenchymal transition (EMT) biomarkers, E-cadherin and Vimentin, by Western blot and immunofluorescence. We found that ARK5 downregulation significantly increased the cisplatin chemosensitivity of NSCLC cells, and that NCI-H1299 cells, which express high levels of ARK5 and possess a mesenchymal phenotype, were more resistant to cisplatin than A549 cells, which show low expression ARK5. Furthermore, siRNA-mediated silencing of ARK5 resulted in altered EMT patterns in NSCLC cells. These data support a role for ARK5 in regulating EMT in NSCLC cells. Together, our findings suggest that ARK5 is a potential drug target for combating drug resistance and regulating EMT in NSCLC cells.