A tea catechin, epigallocatechin-3-gallate, is a unique modulator of the farnesoid X receptor.

A tea catechin, epigallocatechin-3-gallate, is a unique modulator of the farnesoid X receptor.
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DOI:
10.1016/j.taap.2011.11.006
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发表时间:
2012-01-15
影响因子:
3.8
通讯作者:
Guo, Grace L.
Guo, Grace L.
中科院分区:
医学3区
文献类型:
--
作者:
Li, Guodong;Lin, Wenwei;Araya, Juan J.;Chen, Taosheng;Timmermann, Barbara N.;Guo, Grace L.

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Farnesoid X 受体 (FXR) 是一种配体激活的核受体,是维持肝脏和肠道健康的关键调节因子。胆汁酸是 FXR 的内源性配体,人们越来越努力地鉴定 FXR 调节剂作为生物探针和/或药剂。从植物中分离的天然 FXR 配体可以作为合成新型 FXR 调节剂的模型。在这项研究中,我们证明了表没食子儿茶素-3-没食子酸酯 (EGCG)(一种主要的茶儿茶素)能够特异性且剂量依赖性地激活 FXR。此外,EGCG 在体外诱导 FXR 靶基因表达。令人惊讶的是,在共激活剂 (SRC2) 招募测定中,我们发现 EGCG 不会将 SRC2 招募到 FXR,但它剂量依赖性地抑制 GW6064(一种有效的 FXR 合成配体)将 SRC2 招募到 FXR(IC50,1 μM)。此外,EGCG 在体外抑制 GW4064 或鹅去氧胆酸诱导的 FXR 靶基因表达。此外,用急性剂量的 EGCG 处理的野生型和 FXR 敲除小鼠在肠道中诱导了 FXR 靶基因子集的 mRNA 表达,但在肝脏中却没有。总之,EGCG是肠道内独特的FXR调节剂,可能作为FXR调节剂未来开发的重要模型。
Farnesoid X receptor (FXR) is a ligand-activated nuclear receptor and serves as a key regulator to maintain health of the liver and intestine. Bile acids are endogenous ligands of FXR, and there are increasing efforts to identify FXR modulators to serve as biological probes and/or pharmaceutical agents. Natural FXR ligands isolated from plants may serve as models to synthesize novel FXR modulators. In this study, we demonstrated that epigallocatechin-3-gallate (EGCG), a major tea catechin, specifically and dose-dependently activates FXR. In addition, EGCG induced FXR target gene expression in vitro. Surprisingly, in a co-activator (SRC2) recruitment assay, we found that EGCG does not recruit SRC2 to FXR, but it dose-dependently inhibits recruitment of SRC2 to FXR (IC50, 1 μM) by GW6064, which is a potent FXR synthetic ligand. In addition, EGCG suppressed FXR target gene expression induced by either GW4064 or chenodeoxycholic acid in vitro. Furthermore, wild-type and FXR knockout mice treated with an acute dose of EGCG had induced mRNA expression in a subset of FXR target genes in the intestine but not in the liver. In conclusion, EGCG is a unique modulator of FXR in the intestine and may serve as an important model for future development of FXR modulators.
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