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Journal of Dental Research
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Eugenol Triggers Different Pathobiological Effects on Human Oral Mucosal Fibroblasts 1

J.H. Jeng

School of Dentistry, National Taiwan University, 1 Chang-Te Street, Taipei, Taiwan 10016, ROC

L.J. Hahn

School of Dentistry, National Taiwan University, 1 Chang-Te Street, Taipei, Taiwan 10016, ROC

EJ Lu

Graduate Institute of Biochemistry, College of Medicine, National Taiwan University, 1 Chang-Te Street, Taipei, Taiwan 10016, ROC

YJ Wang

Graduate Institute of Biochemistry, College of Medicine, National Taiwan University, 1 Chang-Te Street, Taipei, Taiwan 10016, ROC

M.Y.P. Kuo

School of Dentistry, National Taiwan University, 1 Chang-Te Street, Taipei, Taiwan 10016, ROC

Pathobiological effects of eugenol (4-allyl-2-methoxyphenol), a major constituent of betel quid (BQ), were studied on oral mucosal fibroblasts. At a concentration higher than 3 mmol/L, eugenol was cytotoxic to oral mucosal fibroblasts in a concentration-and time-dependent manner. Cell death was associated with intracellular depletion of glutathione (GSH). Most of the GSH was depleted prior to the onset of cell death. At concentrations of 3 mmol/L and 4 mmol/L, eugenol depleted about 45% and 77% of GSH after one-hour incubation. In addition, eugenol decreased cellular ATP level in a concentration- and time-dependent manner. Eugenol also inhibited lipid peroxidation. Inhibition of lipid peroxidation was partially explained by its dose-dependent inhibition of xanthine oxidase activity. The IC50 of eugenol on xanthine oxidase activity was about 0.3 mmol/L. No DNA strand break activity for eugenol was found at concentrations between 0.5 and 3 mmol/L. Taken together, frequent exposure of oral mucosa to a high concentration of eugenol during the chewing of BQ might be involved in the pathogenesis of oral submucous fibrosis and oral cancer via its cytotoxicity. In contrast, eugenol at a concentration less than 1 mmol/L might protect cells from the genetic attack of reactive oxygen species via inhibition of xanthine oxidase activity and lipid peroxidation.

Key Words: Eugenol • Betel Quid Chewing • Cytotoxicity • Glutathione Depletion • Fibroblast.

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Journal of Dental Research, Vol. 73, No. 5, 1050-1055 (1994)
DOI: 10.1177/00220345940730050601


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This Article
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