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Abstract Title:

Curcumin induces cell cycle arrest and apoptosis in human osteosarcoma (HOS) cells.

Abstract Source:

Anticancer Res. 2009 Dec;29(12):5039-44. PMID: 20044614

Abstract Author(s):

Duk Su Lee, Mi Kyoung Lee, Jeong Hee Kim

Article Affiliation:

Department of Biochemistry, School of Dentistry, Kyung Hee University, 1 Hoeki-Dong, Dongdaemoon-Ku, Seoul 130-701, Korea.

Abstract:

BACKGROUND: Curcumin is a major component of Curcuma longa rhizome and has been used as a traditional medicine for centuries. In this study, we showed that curcumin induced cell cycle arrest followed by antiproliferation and apoptosis in human osteosarcoma (HOS) cells.

MATERIALS AND METHODS: Antiproliferative activity was measured with the 3-(4,5-Dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT) assay. Nuclear fragmentation was observed with a fluorescence microscope. Flow cytometry was performed to observe cell cycle distribution and apoptotic body appearance. Changes in cell cycle regulatory and apoptosis-related proteins were investigated by Western blot analysis.

RESULTS: The IC(50) value of curcumin was approximately 4.0 microg/ml. Induction of apoptosis was evidenced by apoptotic body appearance and chromosomal DNA degradation. Flow-cytometric analysis indicated that curcumin induced successive G(1)/S and G(2)/M phase arrest followed by apoptosis in HOS cells. The G(1)/S and G(2)/S phase arrest was accompanied by down-regulation of cyclin D1, cdc2 and cyclin B1, respectively. Apoptosis was induced by capspase-3 activation and poly(ADP-ribosyl)polymerase (PARP) cleavage.

CONCLUSION: Our results demonstrated that curcumin caused death of HOS cells by blocking cells successively in G(1)/S and G(2)/M phases and activating the caspase-3 pathway.

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Sayer Ji
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