Epigallocatechin gallate (EGCG) inhibits the sulfation of 1-naphthol in a human colon carcinoma cell line, Caco-2

T. Isozaki, H. O. Tamura

研究成果: Article

29 引用 (Scopus)


We have previously reported that epigallocatechin gallate (EGCG) strongly inhibits the in vitro phenol sulfo-transferase (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.

ジャーナルBiological and Pharmaceutical Bulletin
出版物ステータスPublished - 2001 10 4


ASJC Scopus subject areas

  • Pharmacology
  • Pharmaceutical Science