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To evaluate the antioxidative and whitening effects of Houttuynia cordata Thunb (HCT) extract on lead acetate (LA), hair dye component, cell viability was measured by colorimetric assay after NIH3T3 fibroblasts were cultured in media containing various concentrations of LA. And also, the effect of antioxidant, vitamin E on LA-induced cytotoxicity was analysed. For the protective effect of HCT extract on LA-induced cytotoxicity, NIH3T3 fibroblasts were pretreated with 110 or 130μg/mL of HCT extract for 2 h before the treatment of LA. And also, the antioxidative and melanogenic effects of HCT extract were assessed by superoxide dismutase (SOD)-like activity, total amount of melanin and tyrosinase activity. In this study, LA significantly decreased cell viability in dose-dependent manner. And the XTT50 value was calculated at 48.3μM of LA. In the effect of antioxidant, vitamin E, it effectively prevented LA-induced cytotoxicity by the significant increase of cell viability. In the protective effect of HCT extract on LA-induced cytotoxicity, HCT extract significantly increased cell viability which was decreased by the cytotoxicity induced by LA, and also it showed the antioxidative effect by SOD-like activity. In the melanogenesis, HCT extract showed the decreased of amount of melanin and tyrosinase activity. From these results, it is suggested that the cytotoxicity of LA is involved in oxidative stress, and HCT extract effectively prevented the cytotoxicity and the melanogenesis induced by LA.

Antioxidative and Whitening Effects of Houttuynia cordata Extract on Lead Acetate of Hair Dye Component