Baicalin Promoted the Repair of DNA Single Strand Breakage Caused by H_2O_2 in Cultured NIH3T3 Fibroblasts

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The protective effect of Baicalin, a flavonoid isolated from the root of Scutellaria baicalensis G., on H_2O_2-induced DNA single strand break (SSB) was examined in NIH3T3 mouse fibroblasts by Comet assay (single cell gel electrophoresis technique). When the cells were pulse-chased with H_2O_2 (0.1-0.5mM) for 15 min in fetal bovine serum (FBS)-free Dulbecco's Modified Eagle's Medium (DMEM), SSB occurred in the DNA as reported elsewhere in dose-dependent manner. Baicalin (50, 100μm) which was incubated with the cells for 24h before the H_2O_2 chase did not give rise to significant protection against the SSB formation. However, when the time required to cause a change in the DNA damage histogram obtained by the Comet assay was precisely examined after the H_2O_2 chase, it was found that the H_2O_2 induced SSB was more promptly repaired in the cells pretreated with Baicalin prior to the H_2O_2 chase, compared to untreated control cells. At the same time, the cell viability examined by 3-(4,5-dimethylthiazol-2-yl) 2,5-diphenyltetrazolium bromide) (MTT) assay after the H_2O_2 abuse was moderately recovered in the Baicalin increased by the Baicalin treatment. It was thus concluded that Baicalin that was known as an antioxidant flavonoid in vitro also functions as a biological response modifier, improving the cellular repair potential of oxidatively damaged DNA.
公益社団法人日本薬学会の論文
2003-02-01