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저자정보
(Pusan National University) (Pusan National University) (Pusan National University) (Cheju National University) (Pusan National University) (Pusan National University College of Medicine)
저널정보
대한의학회 Journal of Korean Medical Science Journal of Korean Medical Science Vol.20 No.4
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    초록·키워드

    Intestinal epithelial cells (IECs) have been known to produce galactose- 1,4-galac-tose- 1,4-glucose ceramide (Gb3) that play an important role in the mucosal immune response. The regulation of Gb3 is important to prevent tissue damage causing shiga like toxin. Epigallocatechin-3-gallate (EGCG) has been studied as anti-car-cinogenic, anti-oxidant, anti-angiogenic, and anti-viral activities, and anti-diabetic. However, little is known between the expressions of Gb3 on IECs. The aim of this study was to examine the inhibitory effect of EGCG, a major ingredient of green tea, on Gb3 production via mitogen-activated protein kinases (MAPKs) and nuclear factor-kappa B (NF- B) in the TNF- stimulated human colon epithelial cells, HT29. To investigate how Gb3 is regulated, ceramide glucosyltransferase (CGT), lactosylce-ramide synthase (GalT2), and Gb3 synthase (GalT6) were analyzed by RT-PCR in HT 29 cells exposed to TNF- in the presence or absence of EGCG. EGCG dose-dependently manner, inhibits TNF- induced Gb3 expression by blocking in both the MAPKs and NF- B pathways in HT29 cells. TNF- enhanced CGT, GalT2 and GalT6 mRNA levels and EGCG suppressed the level of these enzymes enhanced by TNF- treatment.

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