International Journal of Oral Biology

The Korean Academy of Oral Biology (대한구강생물학회)
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S Phase Cell Cycle Arrest and Apoptosis is Induced by Eugenol in G361 Human Melanoma Cells

  • Rachoi, Byul-Bo (Department of Oral Anatomy, School of Dentistry, Pusan National University) ;
  • Shin, Sang-Hun (Department of Oral & Maxillofacial Surgery, School of Dentistry, Pusan National University) ;
  • Kim, Uk-Kyu (Department of Oral & Maxillofacial Surgery, School of Dentistry, Pusan National University) ;
  • Hong, Jin-Woo (Department of Korean Internal Medicine, School of Korean Medicine, Pusan National University) ;
  • Kim, Gyoo-Cheon (Department of Oral Anatomy, School of Dentistry, Pusan National University)
  • Received : 2011.05.23
  • Accepted : 2011.08.23
  • Published : 2011.09.30
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Abstract

Eugenol is an essential oil found in cloves and cinnamon that is used widely in perfumes. However, the significant anesthetic and sedative effects of this compound have led to its use also in dental procedures. Recently, it was reported that eugenol induces apoptosis in several cancer cell types but the mechanism underlying this effect has remained unknown. In our current study, we examined whether the cytotoxic effects of eugenol upon human melanoma G361 cells are associated with cell cycle arrest and apoptosis using a range of methods including an XTT assay, Hoechst staining, immunocyto-chemistry, western blotting and flow cytometry. Eugenol treatment was found to decrease the viability of the G361 cells in both a time- and dose-dependent manner. The induction of apoptosis in eugenol-treated G361 cells was confirmed by the appearance of nuclear condensation, the release of both cytochrome c and AIF into the cytosol, the cleavage of PARP and DFF45, and the downregulation of procaspase-3 and -9. With regard to cell cycle arrest, a time-dependent decrease in cyclin A, cyclin D3, cyclin E, cdk2, cdk4, and cdc2 expression was observed in the cells after eugenol treatment. Flow cytometry using a FACScan further demonstrated that eugenol induces a cell cycle arrest at S phase. Our results thus suggest that the inhibition of G361 cell proliferation by eugenol is the result of an apoptotic response and an S phase arrest that is linked to the decreased expression of key cell cycle-related molecules.

Keywords

References

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