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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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