Add time:08/12/2019         Source:sciencedirect.com

Cerebrotendinous xanthomatosis (CTX) is a lipid storage disease where the basic defect is a lack of the mitochondrial C27-steroid 26-hydroxylase involved in bile acid synthesis (EC 1.14.13.15). Cholestanol and cholesterol accumulate in all tissues. At least part of the accumulation of cholestanol is due to a 7α-dehydroxylation of early bile acid intermediates. Cholesta-4,6-dien-3-one, a proposed intermediate in this pathway, is found in increased concentrations in serum of the patients. This study shows that cholesta-4,6-dien-3-one may be metabolized to 4-cholesten-3-one and cholestanol by liver, adrenals and brain. No conversion was found in intestinal mucosa or in kidneys. The capacity to convert cholesta-4,6-dien-3-one into 4-cholesten-3-one and cholestanol varied in different tissues as well as in different species. The results are discussed in relation to the cholestanol accumulation in CTX.

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