摘要
Antigenotoxic properties and the possible mechanisms of water extracts from Cassia tora L. (WECT) treated with different degrees of roasting (unroasted and roasted at 150 and 250°C) were evaluated by the Ames Salmonella/microsome test and the Comet assay. Results indicated that WECT, especially unroasted C. tora (WEUCT), markedly suppressed the mutagenicity of 2-amino-6- methyldipyrido(1,2-a:3′:2′-d)imidazole (Glu-P-1) and 3-amino-1,4-dimethyl-5H-pyrido(4,3-b)indole (Trp-P-1). In the Comet assay performed on human lymphocytes, WECT exhibited significant protective effect on Trp-P-1-mediated DNA damage followed the order of unroasted (55%) > roasted at 150°C (42%) > roasted at 250°C (29%). Pre-treatment of the lymphocytes with WEUCT resulted in 30% repression of DNA damage. However, no significant effect on excision-repair system was found during DNA damage expression time in post-treatment scheme (p>0.05). WEUCT showed 84% scavenging effect on oxygen free radicals generated in the activation process of mutagen detected by electron paramagentic resonance system. Two possible mechanisms were considered: (1) neutralization the reactive intermediate of Trp-P-1; and (2) protecting cells directly as an antioxidant that scavenge the oxygen radicals from the activation process of mutagen. The individual anthraquinone content in extracts of C. tora was measured by HPLC. Three anthraquinones, chrysophanol, emodin and rhein, have been detected under experimental conditions. The anthraquinone content decreased with increased roasting temperature. Each of these anthraquinones demonstrated significant antigenotoxicity against Trp-P-1 in the Comet assay. In conclusion, our data suggest that the decrease in antigenotoxic potency of roasted C. tora was related to the reduction in their anthraquinones.
原文 | 英語 |
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頁(從 - 到) | 85-101 |
頁數 | 17 |
期刊 | Life Sciences |
卷 | 76 |
發行號 | 1 |
DOIs | |
出版狀態 | 已發佈 - 11月 19 2004 |
對外發佈 | 是 |
ASJC Scopus subject areas
- 生物化學、遺傳與分子生物學 (全部)
- 藥理學、毒理學和藥劑學 (全部)