Abstract
Valid evidence has demonstrated that microRNAs have critical functions in cancer genesis and tumor progression. In the present study, aberrant expression of microRNA-149 (miR-149) was confirmed in non-small cell lung cancer (NSCLC) tissues. Low expression of miR-149 was associated with malignant clinical features and poor survival. Gain-and loss-of-function experiments demonstrated that miR-149 inhibited NSCLC tumor growth and metastasis invitro and invivo. Furthermore, oncogenic transcription factor FOXM1 was confirmed as a direct target of miR-149 in NSCLC. CyclinD1 and MMP2 served as downstream targets of FOXM1 and were also inhibited by miR-149. In summary, the present study indicated that downregulation of miR-149 in NSCLC predicted poor clinical outcomes. miR-149 suppresses tumor growth and metastasis in NSCLC by inhibiting the FOXM1/cyclinD1/MMP2 signaling pathway.
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