N-acetyltransferase is involved in gypenosides-induced N-acetylation of 2-aminofluorene and DNA adduct formation in human cervix epidermoid carcinoma cells (Ca ski)

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題名:	N-acetyltransferase is involved in gypenosides-induced N-acetylation of 2-aminofluorene and DNA adduct formation in human cervix epidermoid carcinoma cells (Ca ski)
作者:	Chiu, TH;Chen, JC;Chung, JG
貢獻者:	附設醫院婦產部;China Med Coll Hosp, Dept OBS GYN, Taichung, Taiwan;China Med Coll, Inst Integrat Chinese & Western Med, Taichung 404, Taiwan;China Med Coll, Dept Microbiol, Taichung 404, Taiwan;Show Chwan Mem Hosp, Dept Chinese Med, Chungfu, Taiwan
日期:	2003
上傳時間:	2010-09-24 14:49:11 (UTC+8)
出版者:	INT INST ANTICANCER RESEARCH
摘要:	The effects of curcumin on the N-acetyltransferase (NAT) activity, AF-DNA adduct formation and NAT gene expression were examined using the human colon tumor cell line (colo 205). Various concentrations of curcumin were added to the cytosols or to the medium of human colon tumor cells. The NAT activity was determined by high performance liquid chromatography assaying for the amounts of acetylated 2-aminofluorene (AAF) and p-aminobenzoic acid (N-Ac-PABA) and nonacetylated 2-aminofluorene (AF) and p-aminobenzoic acid (PABA). The NAT activity in the human colon tumor cells and cytosols was suppressed by curcumin in a dose-dependent manner. The results demonstrated that gene expression (NAT1 mRNA) in human colon tumor cells was inhibited by curcumin. The apparent values of Km and Vmax of NAT of human colon tumor cells were also decreased by curcumin in cytosols. Curcumin may act as a noncompetitive inhibitor. After the incubation of human colon tumor cells with AF with or without curcumin cotreatment, the cells were recovered and DNA was prepared, hydrolyzed to nucleotides, the adducted nucleotides were extracted into butanol and AF-DNA adducts analyzed by HPLC. The results also demonstrated that when curcumin was added to the media a decrease in AF-DNA adduct formation was seen in the human colon tumor cells. The finding of AF-DNA adduct formation in cultured human colon tumor cells suggests the usefulness of cultured cells for assessing arylamine-induced DNA damage.
關聯:	IN VIVO 17(3):281-288
顯示於類別:	[台中附設醫院] 期刊論文

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