Activation of PI3 kinase/Akt/HIF-1α pathway contributes to hypoxia-induced epithelial-mesenchymal transition and chemoresistance in hepatocellular carcinoma

  • Authors:
    • Min Jiao
    • Ke-Jun Nan
  • View Affiliations

  • Published online on: September 12, 2011     https://doi.org/10.3892/ijo.2011.1197
  • Pages: 461-468
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Abstract

Hypoxia is known to promote malignant progression and to induce chemoresistance in cancer. However, the exact mechanisms driving hypoxia induced malignance remain elusive. We found that with exposure to hypoxic condition, hepatocellular carcinoma (HCC) cells experienced epithelial-mesenchymal transition (EMT), with increased cell migration and invasion, and exhibited high resistance to chemotherapy. We demonstrated that hypoxia-induced EMT and chemoresistance were accompanied by increased HIF-1α expression and activation of Akt. HIF-1α could be blocked by PI3K inhibitor LY294002, indicating HIF-1α activation was regulated by PI3K/Akt pathway. Furthermore, we showed that inhibition of PI3K/Akt and HIF-1α enhanced the therapeutic efficacy of hypoxic chemotherapy in the HCC xenograft model. Our findings indicate that the activation of PI3K/Akt/HIF-1α pathway plays a critical role in mediating hypoxia-induced EMT and drug resistance leading to unfavorable treatment outcome. Our study provides novel insights into the malignant progression triggered by hypoxic microenvironment in HCC cells.

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February 2012
Volume 40 Issue 2

Print ISSN: 1019-6439
Online ISSN:1791-2423

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APA
Jiao, M., & Jiao, M. (2012). Activation of PI3 kinase/Akt/HIF-1α pathway contributes to hypoxia-induced epithelial-mesenchymal transition and chemoresistance in hepatocellular carcinoma. International Journal of Oncology, 40, 461-468. https://doi.org/10.3892/ijo.2011.1197
MLA
Jiao, M., Nan, K."Activation of PI3 kinase/Akt/HIF-1α pathway contributes to hypoxia-induced epithelial-mesenchymal transition and chemoresistance in hepatocellular carcinoma". International Journal of Oncology 40.2 (2012): 461-468.
Chicago
Jiao, M., Nan, K."Activation of PI3 kinase/Akt/HIF-1α pathway contributes to hypoxia-induced epithelial-mesenchymal transition and chemoresistance in hepatocellular carcinoma". International Journal of Oncology 40, no. 2 (2012): 461-468. https://doi.org/10.3892/ijo.2011.1197