文章基本信息

标题：Epigallocatechin Gallate (EGCG) Inhibits the Sulfation of 1-Naphthol in a Human Colon Carcinoma Cell Line, Caco-2
本地全文：下载
作者：Takayo ISOZAKI ; Hiro-omi TAMURA
期刊名称：Biological and Pharmaceutical Bulletin
印刷版ISSN：0918-6158
电子版ISSN：1347-5215
出版年度：2001
卷号：24
期号：9
页码：1076-1078
DOI：10.1248/bpb.24.1076
出版社：The Pharmaceutical Society of Japan
摘要：We have previously reported that epigallocatechin gallate (EGCG) strongly inhibits the in vitro phenol sulfotransferase (P-ST) activity of a human colon carcinoma cell line, Caco-2. In the present study, we examined the ability of EGCG to inhibit the sulfation of 1-naphthol in intact Caco-2 cells. Sulfation of 1-naphthol was detected in Caco-2 cells after 2 h of incubation, and was observed to continue for 24 h, resulting in an accumulation of sulfated 1-naphthol. Sulfation was strongly inhibited by the addition of EGCG to the culture medium. The IC₅₀ of EGCG was calculated to be 20 μM; this value is similar to that obtained from in vitro assays (14 μM) [Ref. Tamura et al., Biol. Pharm. Bull., 23, 695, (2000)]. These results indicate that catechins are capable of inhibiting P-ST activity in intact cells as well as in vitro. We believe that the inhibitory activity of catechins might be the mechanism by which catechins (and green tea) exert anti-carcinogenic activity against procarcinogenic compounds that require P-ST activation in vivo.
关键词：sulfotransferase;inhibition;EGCG;Caco-2;green tea