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Article

KLF5 promotes hypoxia-induced survival and inhibits apoptosis in non-small cell lung cancer cells via HIF-1α

  • Authors:
    • Xiaochen Li
    • Xiansheng Liu
    • Yongjian Xu
    • Jin Liu
    • Min Xie
    • Wang Ni
    • Shixin Chen
  • View Affiliations / Copyright

    Affiliations: Department of Respiratory and Critical Care Medicine, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, P.R. China
  • Pages: 1507-1514
    |
    Published online on: July 17, 2014
       https://doi.org/10.3892/ijo.2014.2544
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Abstract

Transcription factor Krüppel-like factors 5 (KLF5) is overexpressed in a wide range of tumor tissues and acts as a prognostic factor in cancer. However, the role of KLF5 in non-small cell lung cancer is not clear. Hypoxia plays a vital part in the development of cancer via hypoxia-inducible factor 1 (HIF-1). Our study showed that hypoxia (1% O2) increased cell viability, clonality and proliferation and inhibited cell apoptosis in A549 cells. The expression of HIF-1α and KLF5 was increased time-dependently in hypoxia. Using small interfering RNA (siRNA) targeting KLF5 or HIF-1α, we demonstrated that KLF5 or HIF-1α knockdown inhibited hypoxia-induced cell survival and promoted cell apoptosis by actively downregulating cyclin B1, survivin and upregulating caspase-3. Given the similar effect of KLF5 and HIF-1α on cell survival, an attempt was made to investigate the putative interaction of them in hypoxia. KLF5 was revealed to co-immunoprecipitate with HIF-1α and hypoxia increased the amount of KLF5 and HIF-1α complex. Moreover, silencing of KLF5 decreased HIF-1α expression while KLF5 was not affected by HIF-1α inhibition in hypoxia, confirming the effect of KLF5 on upregulation of HIF-1α. In conclusion, this study identified hypoxia as a tumor promoter by triggering KLF5 → HIF-1α → cyclin B1/survivin/caspase-3 in lung cancer cells.
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Copy and paste a formatted citation
Spandidos Publications style
Li X, Liu X, Xu Y, Liu J, Xie M, Ni W and Chen S: KLF5 promotes hypoxia-induced survival and inhibits apoptosis in non-small cell lung cancer cells via HIF-1α. Int J Oncol 45: 1507-1514, 2014.
APA
Li, X., Liu, X., Xu, Y., Liu, J., Xie, M., Ni, W., & Chen, S. (2014). KLF5 promotes hypoxia-induced survival and inhibits apoptosis in non-small cell lung cancer cells via HIF-1α. International Journal of Oncology, 45, 1507-1514. https://doi.org/10.3892/ijo.2014.2544
MLA
Li, X., Liu, X., Xu, Y., Liu, J., Xie, M., Ni, W., Chen, S."KLF5 promotes hypoxia-induced survival and inhibits apoptosis in non-small cell lung cancer cells via HIF-1α". International Journal of Oncology 45.4 (2014): 1507-1514.
Chicago
Li, X., Liu, X., Xu, Y., Liu, J., Xie, M., Ni, W., Chen, S."KLF5 promotes hypoxia-induced survival and inhibits apoptosis in non-small cell lung cancer cells via HIF-1α". International Journal of Oncology 45, no. 4 (2014): 1507-1514. https://doi.org/10.3892/ijo.2014.2544
Copy and paste a formatted citation
x
Spandidos Publications style
Li X, Liu X, Xu Y, Liu J, Xie M, Ni W and Chen S: KLF5 promotes hypoxia-induced survival and inhibits apoptosis in non-small cell lung cancer cells via HIF-1α. Int J Oncol 45: 1507-1514, 2014.
APA
Li, X., Liu, X., Xu, Y., Liu, J., Xie, M., Ni, W., & Chen, S. (2014). KLF5 promotes hypoxia-induced survival and inhibits apoptosis in non-small cell lung cancer cells via HIF-1α. International Journal of Oncology, 45, 1507-1514. https://doi.org/10.3892/ijo.2014.2544
MLA
Li, X., Liu, X., Xu, Y., Liu, J., Xie, M., Ni, W., Chen, S."KLF5 promotes hypoxia-induced survival and inhibits apoptosis in non-small cell lung cancer cells via HIF-1α". International Journal of Oncology 45.4 (2014): 1507-1514.
Chicago
Li, X., Liu, X., Xu, Y., Liu, J., Xie, M., Ni, W., Chen, S."KLF5 promotes hypoxia-induced survival and inhibits apoptosis in non-small cell lung cancer cells via HIF-1α". International Journal of Oncology 45, no. 4 (2014): 1507-1514. https://doi.org/10.3892/ijo.2014.2544
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