AMPK interacts with β-catenin in the regulation of hepatocellular carcinoma cell proliferation and survival with selenium treatment

  • Authors:
    • Song Yi Park
    • Yun-Kyoung Lee
    • Hyun Jung Kim
    • Ock Jin Park
    • Young Min Kim
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  • Published online on: December 24, 2015     https://doi.org/10.3892/or.2015.4519
  • Pages: 1566-1572
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Abstract

Selenium has received much attention as an anticancer agent, although the mechanisms of action underlying its pro-apoptotic properties remain unclear. Tumors that respond well to antioxidant treatments, such as hepatocellular carcinoma (HCC), may benefit from treatment with selenium as this compound also has antioxidant properties. Furthermore, a major oncogenic driver in HCC is the nuclear transcription co-activator, β-catenin. In the present study, we examined the mechanism by which selenium reduces survival of HCC cells, and whether this was associated with modulation of the β-catenin pathway. Hep3B cell lines and cancer cell xenografted animals were treated with selenium, and apoptotic events or signals such as AMPK, β-catenin and GSK3β were determined. Further interactions among β-catenin, glycogen synthase kinase 3β (GSK3β), and AMPK were explored by applying AMPK small interfering RNA (siRNA) or GSK3β siRNA with western blotting or immunofluorescence microscopic observation. Selenium activated AMPK, which in turn suppressed β-catenin. Selenium induced the translocation of AMPK into the nucleus and prevented the accumulation of β-catenin therein. Upon inactivation of AMPK by AMPK siRNA, selenium no longer modulated β-catenin, implying that AMPK is an upstream signal for β-catenin. We found that the binding between AMPK and β-catenin occurs in the cytosolic fraction, and therefore concluded that the cancer cell antiproliferative effects of selenium are mediated by a GSK3β-independent AMPK/β-catenin pathway, although AMPK-mediated GSK3β regulation was also observed. We primarily discovered that AMPK is a crucial regulator initiating selenium-induced inhibition of β-catenin expression. Taken together, these novel findings help to illuminate the molecular mechanisms underlying the anticancer effect of selenium and highlight the regulation of β-catenin by selenium.
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March-2016
Volume 35 Issue 3

Print ISSN: 1021-335X
Online ISSN:1791-2431

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Spandidos Publications style
Park SY, Lee Y, Kim HJ, Park OJ and Kim YM: AMPK interacts with β-catenin in the regulation of hepatocellular carcinoma cell proliferation and survival with selenium treatment. Oncol Rep 35: 1566-1572, 2016
APA
Park, S.Y., Lee, Y., Kim, H.J., Park, O.J., & Kim, Y.M. (2016). AMPK interacts with β-catenin in the regulation of hepatocellular carcinoma cell proliferation and survival with selenium treatment. Oncology Reports, 35, 1566-1572. https://doi.org/10.3892/or.2015.4519
MLA
Park, S. Y., Lee, Y., Kim, H. J., Park, O. J., Kim, Y. M."AMPK interacts with β-catenin in the regulation of hepatocellular carcinoma cell proliferation and survival with selenium treatment". Oncology Reports 35.3 (2016): 1566-1572.
Chicago
Park, S. Y., Lee, Y., Kim, H. J., Park, O. J., Kim, Y. M."AMPK interacts with β-catenin in the regulation of hepatocellular carcinoma cell proliferation and survival with selenium treatment". Oncology Reports 35, no. 3 (2016): 1566-1572. https://doi.org/10.3892/or.2015.4519