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Javad Behravan,Fatemeh Mosafa,Negar Soudmand,Elahe Taghiabadi,Bibi Marjan Razavi,Gholamreza Karimi 사단법인약침학회 2011 Journal of Acupuncture & Meridian Studies Vol.4 No.3
The comet assay is a standard method for measuring DNA damage. In this study, the protective effects of ethanolic and aqueous extracts of Portulaca oleracea L. (P. oleracea)on human lymphocyte DNA lesions were evaluated with the comet assay. Lymphocytes were isolated from blood samples taken from healthy volunteers. Human lymphocytes were incubated in H_2O_2 (50,100, and 200 mM), aqueous extract (0.05, 0.1,0.5, 1, and 2.5 mg/ml), and ethanolic extracts (0.05, 0.1, 0.5, 1, and 2.5 mg/ml) of P. oleraceae aerial parts alone with a combination of H_2O_2 (100 mM) with either 1 or 2.5 mg/ml of both extracts at 4℃ for 30 minutes. The extent of DNA migration was measured using the alkaline single cell gel electrophoresis approach assay, and DNA damage was expressed as percentage tail DNA. We found that the aqueous extract of P. oleracea significantly inhibited DNA damage, while there was no effect of the ethanolic extract. These data suggest that the aqueous extract of P. oleracea can prevent oxidative DNA damage to human lymphocytes, which is likely due to antioxidant constituents in the extract.