title: In vitro antioxidation activity and genoprotective effect of selected Chinese medicinal herbs.
abstract: Some traditional Chinese medicinal seeds and fruits are well known for their antioxidant properties. This research aims to investigate whether Fructus Lycii, Fructus Schisandrae Chinensis, Fructus Ligustri Lucidi and Semen Cuscutae protect DNA from oxidant challenge by hydrogen peroxide (H(2)O(2)). The standard comet assay was used to assess the genoprotective effect of these medicinal herbs. Blood was taken from three healthy adults, aged from 36 to 42. Lymphocytes were isolated and treated with different concentrations of aqueous herbal extracts, while controls were treated with phosphate buffered saline. The lymphocytes were stressed with 50 μM H(2)O(2). Treated cells were embedded in agarose and layered on slides. These sandwiched lymphocytes were lysed and afterwards subjected to an electric field in an alkaline environment. Damaged DNA was pulled out from the nucleus towards the positive electrode as a comet tail; its density was related to the degree of DNA damage. Finally, the slides were stained with fluorescence dye and tails were visually scored for 100 cells. The experiment was repeated three times and DNA damage in treated cells was compared to the controls. There was no statistical difference in DNA damage among the herb treated cells and untreated cells in the comet assay. Our data demonstrated that the selected medicinal herbs did not show in vitro DNA protection in the comet assay against oxidant challenge.
authors: Department of Applied Science, Hong Kong Institute of Vocational Education (Shatin), Sha Tin, New Territories, Hong Kong. savio.yim.tong.szeto@inet.polyu.edu.hk
authors: Yim Tong
authors: YT
authors: Szeto
authors: Shirley Ching Yee
authors: SC
authors: Wong
authors: Julia Wai Ming
authors: JW
authors: Wong
authors: Wouter
authors: W
authors: Kalle
authors: Sok Cheon
authors: SC
authors: Pak
mesh_terms: D000975:Antioxidants / Q000494:pharmacology*; D020552:Comet Assay; D034182:Cuscuta; D004249:DNA Damage; D004365:Drugs, Chinese Herbal / Q000494:pharmacology*; D005638:Fruit; D006801:Humans; D006861:Hydrogen Peroxide; D031659:Ligustrum; D032305:Lycium; D008214:Lymphocytes / Q000187:drug effects*; D016877:Oxidants; D018384:Oxidative Stress / Q000187:drug effects*; D010946:Plants, Medicinal; D032141:Schisandra; D012639:Seeds
chemical_list: D000975:Antioxidants; D004365:Drugs, Chinese Herbal; D016877:Oxidants; D006861:Hydrogen Peroxide