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- W2043964123 abstract "The metabolism of intravenously infused bile salts, tauroursodeoxycholate, tauro-beta-muricholate and their corresponding unconjugated forms in the liver was investigated in bile salt-depleted bile fistula rats. The biliary bile salt composition was determined by gas chromatography-mass spectrometry using chemical positive ionization and electron-impact methods. For an infusion rate of 2 micromol/min/kg, all bile salts were efficiently secreted in bile, inducing similar choleresis. Only tauroconjugated bile salts were recovered; no glucuronide or glyco derivatives were detected. The infusion of free ursodeoxycholate led to the appearance of a metabolite identified as a Delta22 derivative (12%). A similar biotransformation rate (11%) was observed following free beta-muricholate infusion. In contrast, no metabolite was observed after infusion of the tauroconjugated form of ursodeoxycholate and beta-muricholate. The unsaturation process probably depends on the availability of the carboxyl group for the starting step of the beta-oxidation mechanism. In conclusion, the current in vivo study demonstrates a hepatic origin for Delta22 bile salts. It also shows that free bile salts were sensitive to Delta22 formation while conjugation with taurine totally prevented the side-chain oxidation of the two 7beta-hydroxylated bile salts." @default.
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- W2043964123 date "2004-08-01" @default.
- W2043964123 modified "2023-09-27" @default.
- W2043964123 title "Conjugation with taurine prevents side-chain desaturation of ursodeoxycholic and beta-muricholic acids in bile fistula rats" @default.
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- W2043964123 doi "https://doi.org/10.1111/j.1472-8206.2004.00266.x" @default.
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