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Resveratrol has been shown to possess antioxi-dant and anticancer activities, but litle is known on the effect of resveratrol derivatives. Recently we have isolated resveratrol and its dimers and trimers from peony (Paeonia lactiflora) seeds, and reported their strong antioxidant and cytotoxic activity. In the present study, we have evaluated celular efects of resveratrol derivatives; viniferin, and apoptosis in HL-60 cels in vitro. All resvera-trol and its derivatives reduced viability of HL-60 cels in a dose-dependent maner with their IC50 values of 20-90 M. Ascending orders of IC50 val-ues were sufruticosol B, gnetin H, viniferin and resveratrol respectively. HL-60 cels treated with the four stilbenes exhibited the distinct morpholo-gical changes characteristics of cell apoptosis such as chromatin condensation, apoptotic bodies, and of the celular DNA analyzed by flow cytometry revealed a rapid increase in subdiploid cells and a concomitant decrease in diploid cells exposed to 100 M resveratrol for 0-24 h. Cels treated with 25 M of resveratrol, viniferin, gnetin H, and suf-fruticosol B for 24 h resulted increment of sub-G1 population by 51, 5, 11 and 59%, respec-tively. Treatment of cels with 0-20 M resveratrol for 5 h produced a concentration-dependent decre-ase in cytochrome P450 (CYP) 1B1 mRNA levels. pression. These results demonstrated that resver-atrol oligomers also strongly supressed HL-60 cel proliferation, and induced DNA damage. In addition, CYP1B1 gene supression may sugest an involvement in the resveratrol-induced apop-tosis in HL-60 cells.

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