Urinary excretion of bile acids in bile duct-ligated rats
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- 作者：Yukiko Takada ; Naoyo Sano and Hajime Takikawa
- 关键词：Key words ; bile acid ; bile duct ligation ; cholestasis ; jaundice ; urinary excretion
- 刊名：Journal of Gastroenterology
- 出版时间：June 2003
- 出版年：2003
- 期刊代码：122_0944-1174
- 类别：med
- 卷：38
- 期：6
- 页码：561-566
- 数据来源：sp
摘要
In patients with complete bile duct obstruction, the only pathway of bile acid elimination is through the urine. However, the urinary excretion of various bile acid conjugates in the presence of bile duct obstruction has not been clarified. Given this factor, the urinary excretion of various bile acids was compared in rats that were bile duct-ligated for 3 days. Methods. After urinary bladder cannulation, radiolabeled bile acids were intravenously injected, and urine samples were collected every 2 h for 6 h, and radioactivity was counted. Results. Urinary excretion (cumulative percent dose during 6 h) of taurocholate and cholate was similar (19.3%and 16.8%). Urinary excretion of tauroursodeoxycholate, lithocholate, and taurolithocholate-sulfate was less effective (12.7%, 9.8%and 2.1%, respectively). Cholate was mostly conjugated with taurine, and lithocholate was mostly conjugated with taurine and further hydroxylated. Conclusions. These results indicate that unconjugated bile acids were taken up by the liver and excreted into the blood after further biotransformation even under conditions of complete bile duct obstruction. Although bile acid sulfates are the major bile acids in the urine of patients with obstructive jaundice, monohydroxylated bile acids are considered not to be so effectively excreted into the urine, even with conjugation with taurine and sulfate, in rats.