出版社：American Society for Biochemistry and Molecular Biology
摘要：Using thin-layer chromatography, bile alcohol glucuronides were found with taurine- and glycine-conjugated bile acids in the bile of four patients with cerebrotendinous xanthomatosis. The concentration of the bile alcohol glucuronides was 1.7-5.2 times higher than that of the conjugated bile acids. Detectable amounts of unconjugated bile alcohols were not found in the bile of these patients. The bile alcohol glucuronides were isolated from the bile of one of the patients by means of preparative thin-layer chromatography. Treatment with beta-glucuronidase of the bile alcohol glucuronides liberated glucuronic acid and a mixture of bile alcohols. More than 90% of the liberated bile alcohols was 5 beta-cholestane-3 alpha, 7 alpha, 25-tetrol, and lesser amounts of 5 beta-cholestane-3 alpha, 7 alpha, 12 alpha, 23-tetrol, 5 beta-cholestane-3 alpha, 7 alpha, 12 alpha, 24-tetrol, 5 beta-cholestane-3 alpha, 7 alpha, 12 alpha, 23, 25-pentol, and 5 beta-cholestane-3 alpha,-7 alpha, 12 alpha, 24 alpha, 25-pentol were also obtained. The bile alcohol glucuronides were not oxidized by the treatment with 3 alpha-hydroxysteroid dehydrogenase, indicating that the glucuronide moiety was at 3 alpha-hydroxyl position of the bile alcohols. Comparison of the mass spectra of the acetylated and methylated derivatives of the natural glucuronides and the synthetic 7 alpha, 12 alpha, 25-triacetoxy-5 beta-cholestan-3 alpha-O-(methyl 2,3,4-tri-O-acetyl-beta-D-glucopyranosyluronate) also indicated that the bile alcohol glucuronides consisted of mainly 5 beta - cholestane - 3 alpha, 7 alpha, 12 alpha, 25 - tetrol - glucuronide.
