Journal
LIFE SCIENCES
Volume 92, Issue 6-7, Pages 352-358Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.lfs.2013.01.013
Keywords
Curcumin; Apoptosis; FasL; p38; Huh7 cells
Funding
- National Natural Science Foundation of China [81100369]
- China Postdoctoral Science Foundation [2012M521583]
- Medical Scientific Research Foundation of Guangdong Province [A2009318]
- Administration of Traditional Chinese Medicine of Guangdong Province [2009415]
- Scientific Research Foundation of Guangdong Pharmaceutical University [2009JCX01]
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Aim: The aim of this study is to explore the underlying molecular mechanism of curcumin-induced apoptosis in human hepatocellular carcinoma (HCC) Huh7 cells. Main methods: Fas and FasL mRNA expression was analyzed by reverse transcription PCR. Western blot was applied to detect the protein expression of Bcl-2 family members, MAPK family members, c-Jun, c-Fos, ATF-2, caspase-3, PARP, TNF receptor family members and the respective ligands. Apoptotic cells were assayed with annexin V/PI double staining and flow cytometry. Key findings: Curcumin treatment resulted in a fast and significant increase of Fas and Fas ligand (FasL) along with activation of caspase-3 and cleavage of PARP in Huh7 cells. Inhibition of caspase-3 activity by the specific inhibitor Z-DEVD-FMK rescued Huh7 cells from curcumin-induced apoptosis. Neutralization of FasL significantly protected the cells from curcumin-induced caspase-3 activation and apoptosis in a dose-dependent manner. Moreover, p38 was rapidly activated in response to curcumin, and inactivation of p38 by pharmacologic inhibitor SB203580 dramatically suppressed curcumin-induced FasL expression and apoptosis. Significance: Our results demonstrated that curcumin induces apoptosis through p38-denpendent up-regulation of FasL in Huh7 cells. (c) 2013 Elsevier Inc. All rights reserved.
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