[No authors listed]
Radioresistance is a major challenge in lung cancer radiotherapy (RT), and consequently, new radiosensitizers are urgently needed. MicroRNAs (miRNAs) have been demonstrated to participate in many important cellular processes including radiosensitization. MiR-365 is dysregulated in non-small cell lung cancer (NSCLC) and is able to restrain the development of NSCLC. However, the relationship between miR-365 and radiosensitivities of NSCLC cells remains largely unknown. Here we reveal that overexpression of miR-365 is able to enhance the radiosensitivity of NSCLC cells through targeting CDC25A. We found that the expression level of miR-365 was positively correlated with the radiosensitivity of NSCLC cell lines. Furthermore, our results showed that overexpression of miR-365 could sensitize A549â¯cells to the irradiation. However, knockdown of miR-365 in H460â¯cells could act the converse manner. Mechanically, miR-365 was able to directly target 3'UTR of cell division cycle 25A (CDC25A) mRNA and reduce the expression of CDC25A at the levels of mRNA and protein. And we confirmed that miR-365 could increase the radiosensitivity of NSCLC cells by targeting CDC25A using in vitro and in vivo assays. Taken together, restoration of miR-365 expression enhances the radiosensitivity of NSCLC cells by suppressing CDC25A, and miR-365 could be used as a radiosensitizer for NSCLC therapy.
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