7α, 25-二羟基胆固醇(7α,25-OHC)是孤儿 GPCR 受体 EBI2 (GPR183) 的有效选择性激动剂和内源性配体。它能够强烈激活 EBI2 (EC50=140 pM; Kd=450 pM),并作为一种趋化因子,引导 B 细胞、T 细胞和树突状细胞的迁移。
靶点Human Endogenous Metabolite
体外研究在体外实验中,7α, 25-二羟基胆固醇(7α,25-OHC)能够刺激表达 EBI2 的小鼠 B 和 T 细胞的迁移,半最大效应浓度值约为 500 pM。然而,在 EBI2 缺失细胞上没有观察到这种效应。
体内研究EBI2 缺失的 B 细胞或预先用 1 μM 7α,25-二羟基胆固醇(1.5 小时)处理过的正常 B 细胞,其归巢至脾脏滤泡区的能力会显著降低。
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
25-羟基胆甾醇 | 25-hydroxychlolesterol | 2140-46-7 | C27H46O2 | 402.661 |
—— | cholest-5-ene-3β,7α,25-triol 3β,25-dibenzoate | 306288-44-8 | C41H54O5 | 626.877 |
—— | cholest-5-ene-3β,25-diyl dibenzoate | 64164-61-0 | C41H54O4 | 610.877 |
中文名称 | 英文名称 | CAS号 | 化学式 | 分子量 |
---|---|---|---|---|
—— | 7α,25-dihydroxy-4-cholesten-3-one | 98774-41-5 | C27H44O3 | 416.645 |
▪ Abstract The synthesis and excretion of bile acids comprise the major pathway of cholesterol catabolism in mammals. Synthesis provides a direct means of converting cholesterol, which is both hydrophobic and insoluble, into a water-soluble and readily excreted molecule, the bile acid. The biosynthetic steps that accomplish this transformation also confer detergent properties to the bile acid, which are exploited by the body to facilitate the secretion of cholesterol from the liver. This role in the elimination of cholesterol is counterbalanced by the ability of bile acids to solubilize dietary cholesterol and essential nutrients and to promote their delivery to the liver. The synthesis of a full complement of bile acids requires 17 enzymes. The expression of selected enzymes in the pathway is tightly regulated by nuclear hormone receptors and other transcription factors, which ensure a constant supply of bile acids in an ever changing metabolic environment. Inherited mutations that impair bile acid synthesis cause a spectrum of human disease; this ranges from liver failure in early childhood to progressive neuropathy in adults.