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Article

Ethanol extract of Kalopanax septemlobus leaf induces caspase-dependent apoptosis associated with activation of AMPK in human hepatocellular carcinoma cells

  • Authors:
    • Cheol Park
    • Ji-Suk Jeong
    • Jin-Woo Jeong
    • Yong-Joo Kim
    • Yeon-Kwon Jung
    • Geun-Bae Go
    • Sung Ok Kim
    • Gi-Young Kim
    • Su-Hyun Hong
    • Young Hyun Yoo
    • Yung Hyun Choi
  • View Affiliations / Copyright

    Affiliations: Department of Molecular Biology, College of Natural Sciences and Human Ecology, Dongeui University, Busan 614-714, Republic of Korea, Anti-Aging Research Center, Dongeui University, Busan 614-714, Republic of Korea, Gurye Wild Flower Institute, Gurye 504-805, Republic of Korea, Gurye-gun Agricultural Center, Gurye 504-805, Republic of Korea, Department of Food Science and Biotechnology, College of Engineering, Kyungsung University, Busan 608-736, Republic of Korea, Laboratory of Immunobiology, Department of Marine Life Sciences, Jeju National University, Jeju 690-756, Republic of Korea, Department of Biochemistry, Dongeui University College of Korean Medicine, Busan 614-714, Republic of Korea, Department of Anatomy and Cell Biology, Dong-A University College of Medicine and Mitochondria Hub Regulation Center, Busan 602-714, Republic of Korea
  • Pages: 261-270
    |
    Published online on: November 5, 2015
       https://doi.org/10.3892/ijo.2015.3233
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Abstract

The Kalopanax septemlobus leaf (Thunb.) Koidz. has been used as a traditional medicine herb for the treatment of various human diseases for hundreds of years. In this study, we investigated the mechanism underlying the inhibitory effects of an ethanol extract of K. septemlobus leaf (EEKS) on proliferation of HepG2 hepatocellular carcinoma cells. For this study, cell viability and apoptosis were evaluated using the MTT [3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide] assay, DAPI (4,6-diamidino-2-phenylindole) staining, agarose gel electrophoresis, and flow cytometry. Measurements of the mitochondrial membrane potential (MMP), caspase activity assays and western blots were conducted to determine whether HepG2 cell death occurred by apoptosis. Treatment of HepG2 cells with EEKS concentration-dependently reduced cell survival while significantly increasing the ratio of apoptotic cells. EEKS treatment increased the levels of the death receptors (DRs), DR4 and DR5, and activated caspases, as well as promoting proteolytic degradation of poly(ADP-ribose)-polymerase associated with the downregulation of protein expression of members of the inhibitor of apoptosis protein family. Treatment with EEKS also caused truncation of Bid, translocation of pro-apoptotic Bax to the mitochondria, and loss of mitochondrial membrane permeabilization, thereby inducing the release of cytochrome c into the cytosol. However, treatment of HepG2 cells with a pan-caspase inhibitor reversed EEKS-induced apoptosis and growth suppression, indicating that EEKS appears to induce apoptosis though a caspase-dependent mechanism involving both intrinsic and extrinsic apoptotic pathways. In addition, the phosphorylation level of AMP-activated protein kinase (AMPK) was elevated when cells were exposed to EEKS. A specific inhibitor for AMPK attenuated the EEKS-induced activation of caspases, and consequently prevented the EEKS-induced apoptosis and reduction in cell viability. Overall, our findings suggest that EEKS inhibits the growth of HepG2 cells by inducing AMPK-mediated caspase-dependent apoptosis, suggesting the potential therapeutic application of EEKS in the treatment or prevention of cancers.
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Copy and paste a formatted citation
Spandidos Publications style
Park C, Jeong J, Jeong J, Kim Y, Jung Y, Go G, Kim SO, Kim G, Hong S, Yoo YH, Yoo YH, et al: Ethanol extract of Kalopanax septemlobus leaf induces caspase-dependent apoptosis associated with activation of AMPK in human hepatocellular carcinoma cells. Int J Oncol 48: 261-270, 2016.
APA
Park, C., Jeong, J., Jeong, J., Kim, Y., Jung, Y., Go, G. ... Choi, Y.H. (2016). Ethanol extract of Kalopanax septemlobus leaf induces caspase-dependent apoptosis associated with activation of AMPK in human hepatocellular carcinoma cells. International Journal of Oncology, 48, 261-270. https://doi.org/10.3892/ijo.2015.3233
MLA
Park, C., Jeong, J., Jeong, J., Kim, Y., Jung, Y., Go, G., Kim, S. O., Kim, G., Hong, S., Yoo, Y. H., Choi, Y. H."Ethanol extract of Kalopanax septemlobus leaf induces caspase-dependent apoptosis associated with activation of AMPK in human hepatocellular carcinoma cells". International Journal of Oncology 48.1 (2016): 261-270.
Chicago
Park, C., Jeong, J., Jeong, J., Kim, Y., Jung, Y., Go, G., Kim, S. O., Kim, G., Hong, S., Yoo, Y. H., Choi, Y. H."Ethanol extract of Kalopanax septemlobus leaf induces caspase-dependent apoptosis associated with activation of AMPK in human hepatocellular carcinoma cells". International Journal of Oncology 48, no. 1 (2016): 261-270. https://doi.org/10.3892/ijo.2015.3233
Copy and paste a formatted citation
x
Spandidos Publications style
Park C, Jeong J, Jeong J, Kim Y, Jung Y, Go G, Kim SO, Kim G, Hong S, Yoo YH, Yoo YH, et al: Ethanol extract of Kalopanax septemlobus leaf induces caspase-dependent apoptosis associated with activation of AMPK in human hepatocellular carcinoma cells. Int J Oncol 48: 261-270, 2016.
APA
Park, C., Jeong, J., Jeong, J., Kim, Y., Jung, Y., Go, G. ... Choi, Y.H. (2016). Ethanol extract of Kalopanax septemlobus leaf induces caspase-dependent apoptosis associated with activation of AMPK in human hepatocellular carcinoma cells. International Journal of Oncology, 48, 261-270. https://doi.org/10.3892/ijo.2015.3233
MLA
Park, C., Jeong, J., Jeong, J., Kim, Y., Jung, Y., Go, G., Kim, S. O., Kim, G., Hong, S., Yoo, Y. H., Choi, Y. H."Ethanol extract of Kalopanax septemlobus leaf induces caspase-dependent apoptosis associated with activation of AMPK in human hepatocellular carcinoma cells". International Journal of Oncology 48.1 (2016): 261-270.
Chicago
Park, C., Jeong, J., Jeong, J., Kim, Y., Jung, Y., Go, G., Kim, S. O., Kim, G., Hong, S., Yoo, Y. H., Choi, Y. H."Ethanol extract of Kalopanax septemlobus leaf induces caspase-dependent apoptosis associated with activation of AMPK in human hepatocellular carcinoma cells". International Journal of Oncology 48, no. 1 (2016): 261-270. https://doi.org/10.3892/ijo.2015.3233
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