Add time:08/22/2019         Source:sciencedirect.com

Liver alcohol dehydrogenase (EC 1.1.1.1) is believed to catalyze the oxidation of 26-hydroxylated intermediates in the biosynthesis of bile acids from cholesterol. We have therefore analyzed the composition and size of the bile acid pool in deermice genetically lacking alcohol dehydrogenase. Cholic acid was found to be the major primary bile acid accompanied by small amounts of Chenodeoxycholic acid. Variable amounts of secondary bile acids were also present, mainly deoxycholic acid and 3α,12α-dihydroxy-7-oxo-5β-cholanoic acid. The same bile acids were found in animals with normal levels of alcohol dehydrogenase. The pool of bile acids in the gallbladder, small intestine and large intestine varied between 4.2 and 8.4 μ mol in four animals lacking alcohol dehydrogenase and between 6.0 and 8.4 μ mol in four control animals. Ethanol did not influence pool size or composition of bile acids in the animal studied. It is concluded that alcohol dehydrogenase is not obligatory for normal bile acid biosynthesis.

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