J Clin Invest. 1974 May;53(5):1393-401.

A biochemical abnormality in cerebrotendinous xanthomatosis. Impairment of bile acid biosynthesis associated with incomplete degradation of the cholesterol side chain.

Setoguchi T, Salen G, Tint GS, Mosbach EH.

Abstract

Bile acid production in cerebrotendinous xanthomatosis (CTX) is subnormal, yet the activity of cholesterol 7alpha-hydroxylase, the rate-determining enzyme of bile acid synthesis, is elevated. To explain this discrepancy, bile acid precursors were sought in bile and feces of three CTX subjects. Over 10% of the total sterols excreted in bile and feces consisted of compounds more polar than cholesterol. Chromatographic analysis of the polar fractions in conjunction with gasliquid chromatography (GLC)-mass spectrometry indicated two major constituents, 5beta-cholestane-3alpha,7alpha,12alpha,25-tetrol and 5beta-cholestane-3alpha,7alpha,12alpha,24xi,25-pentol. After i.v. injection of [4-(14)C]cholesterol both bile alcohols were radioactive proving that they were derived from cholesterol. The accumulation of alcohols hydroxylated at C-25 and C-24,25 suggests that decreased bile acid synthesis in CTX results from impaired oxidation of the cholesterol side chain. This finding and the virtual absence of intermediates hydroxylated at C-26 indicate that current views of the major pathway of bile acid synthesis may require revision.

PMID:: 4825231; [PubMed - indexed for MEDLINE]
PMCID: PMC302628

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A biochemical abnormality in cerebrotendinous xanthomatosis. Impairment of bile acid biosynthesis associated with incomplete degradation of the cholesterol side chain.

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