Abstract
α-Mangostin is a dietary xanthone that has been shown to have anti-cancer and anti-proliferative properties in various types of human cancer cells. This study investigates the molecular mechanism of the apoptosis-inducing effects of α-mangostin on human hepatocellular carcinoma (HCC) cells. We observed that α-mangostin reduces the viability of HCC cells in a dose- and time-dependent manner. α-Mangostin mediated apoptosis of SK-Hep-1 cells is accompanied by nuclear chromatin condensation and cell cycle arrest in the sub-G1 phases as well as phosphatidylserine exposure. Furthermore, α-mangostin triggered the mitochondrial caspase apoptotic pathway, as indicated by the loss of mitochondrial membrane potential, the release of cytochrome c from mitochondria, and the regulation of B cell lymphoma 2 family member expression. Moreover, α-mangostin inhibited a sustained activation of p38 mitogen-activated protein kinase (MAPK) phosphorylation, and treatment with a p38 MAPK inhibitor enhanced α-mangostin-induced caspase activation and apoptosis in SK-Hep-1 cells. In vivo xenograft mice experiments revealed that α-mangostin significantly reduced tumor growth and weight in mice inoculated with SK-Hep-1 cells. These findings demonstrate that α-mangostin induces mitochondria-mediated apoptosis through inactivation of the p38 MAPK signaling pathway and that α-mangostin inhibits the in vivo tumor growth of SK-Hep-1 xenograft mice.
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Abbreviations
- HCC:
-
Human hepatocellular carcinoma
- MMP:
-
Mitochondrial membrane potential
- MTT:
-
3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyl-tetrazolium bromide
- JC-1:
-
5,5′,6,6′-Tetrachloro-1,1′,3,3′-tetraethylbenzimidazol-carbocyanine iodide
- MAPK:
-
Mitogen-activated protein kinase
- FBS:
-
Fetal bovine serum
- PI:
-
Propidium iodide
- PARP:
-
Poly(ADP-ribose) polymerase
- Bcl-2:
-
B cell lymphoma 2
- Bax:
-
B cell lymphoma 2-associated X protein
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Acknowledgments
This work was supported by Grants from National Science Council, Taiwan (NSC100-2313-B-040-001 and NSC101-2313-B-040-001) and Chung Shan Medical Hospital, Taichung, Taiwan (CSH-2011-C-026).
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The authors declare that there are no conflicts of interest.
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Shun-Fa Yang and Yi-Hsien Hsieh contributed equally to this work.
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Hsieh, SC., Huang, MH., Cheng, CW. et al. α-Mangostin induces mitochondrial dependent apoptosis in human hepatoma SK-Hep-1 cells through inhibition of p38 MAPK pathway. Apoptosis 18, 1548–1560 (2013). https://doi.org/10.1007/s10495-013-0888-5
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DOI: https://doi.org/10.1007/s10495-013-0888-5