Withaferin A induces apoptosis through the generation of thiol oxidation in human head and neck cancer cells

  • Authors:
    • Jong Won Park
    • Kyoung-Jin Min
    • Dong Eun Kim
    • Taeg Kyu Kwon
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  • Published online on: October 27, 2014     https://doi.org/10.3892/ijmm.2014.1983
  • Pages: 247-252
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Abstract

Withaferin A is a steroidal lactone purified from the Indian medicinal plant, Withania somnifera. Withaferin A has been shown to inhibit the proliferation, metastasis, invasion and angiogenesis of cancer cells. In the present study, we investigated whether withaferin A induces apoptosis in the human head and neck cancer cells, AMC-HN4. Withaferin A markedly increased the sub-G1 cell population and the cleavage of poly(ADP-ribose) polymerase (PARP), which are markers of apoptosis. Pan-caspase inhibitor, z-VAD-fmk (z-VAD), markedly inhibited the withaferin A-induced apoptosis. However, the withaferin A-induced increase in the expression of COX-2 was not affected by treatment with z-VAD. Furthermore, withaferin A upregulated cyclooxygenase-2 (COX-2) expression. The COX-2 inhibitor, NS-398, reduced the withaferin A-induced production of prostaglandin E2. However, treatment with NS-398 did not affect the sub-G1 population and the cleavage of PARP. In addition, the withaferin A-induced apoptosis was independent of reactive oxygen species production. Thiol donors [N-acetylcysteine (NAC) and dithiothreitol (DTT)] reversed withaferin A-induced apoptosis. Therefore, our data suggest that withaferin A induces apoptosis through the mechanism of thiol oxidation in head and neck carcinoma cells.
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January-2015
Volume 35 Issue 1

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Online ISSN:1791-244X

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Spandidos Publications style
Park JW, Min K, Kim DE and Kwon TK: Withaferin A induces apoptosis through the generation of thiol oxidation in human head and neck cancer cells. Int J Mol Med 35: 247-252, 2015.
APA
Park, J.W., Min, K., Kim, D.E., & Kwon, T.K. (2015). Withaferin A induces apoptosis through the generation of thiol oxidation in human head and neck cancer cells. International Journal of Molecular Medicine, 35, 247-252. https://doi.org/10.3892/ijmm.2014.1983
MLA
Park, J. W., Min, K., Kim, D. E., Kwon, T. K."Withaferin A induces apoptosis through the generation of thiol oxidation in human head and neck cancer cells". International Journal of Molecular Medicine 35.1 (2015): 247-252.
Chicago
Park, J. W., Min, K., Kim, D. E., Kwon, T. K."Withaferin A induces apoptosis through the generation of thiol oxidation in human head and neck cancer cells". International Journal of Molecular Medicine 35, no. 1 (2015): 247-252. https://doi.org/10.3892/ijmm.2014.1983