Abstract
Deregulated microRNAs (miRNAs) are small noncoding RNAs that are involved in the carcinogenesis of various cancers, including lung cancer. HIF1α has been suggested to be a master regulator of hypoxia-induced cell proliferation. The relationship between HIF1α expression and the progression of non-small cell lung cancer (NSCLC) is not fully understood, and whether HIF1α expression is regulated by miRNAs in this process remains unclear. In this study, we found that the upregulation of HIF1α expression and the reduction in miR-199a levels were highly associated with NSCLC progression. NSCLC cells derived from cancer tissues with low miR-199a levels showed high HIF1α expression and high proliferation capacity. Moreover, HIF1α and glycolysis inhibitors suppress the proliferation of NSCLC cells. MiR-199a overexpression suppressed the hypoxia-induced proliferation of NSCLC cells through targeting elevated HIF1α and blocking the downstream upregulation of PDK1 without affecting AKT activation. Together, these results indicate that downregulation of miR-199a is essential for hypoxia-induced proliferation through derepressing the expression of HIF1α expression and affecting HIF1α mediated glycolytic pathway in NSCLC progression.
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This work was supported by the key projects of the Shanghai Municipal Science and Technology Commission (No. 10411956700).
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Ding, G., Huang, G., Liu, Hd. et al. MiR-199a suppresses the hypoxia-induced proliferation of non-small cell lung cancer cells through targeting HIF1α. Mol Cell Biochem 384, 173–180 (2013). https://doi.org/10.1007/s11010-013-1795-3
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DOI: https://doi.org/10.1007/s11010-013-1795-3