Journal
JOURNAL OF LIPID RESEARCH
Volume 52, Issue 8, Pages 1509-1516Publisher
ELSEVIER
DOI: 10.1194/jlr.M014084
Keywords
cerebrotendinous xanthomatosis; cholesterol 25-hydroxylase; CYP3A4; CYP27A1; CYP46A1; 4 beta-hydroxycholesterol; 25-hydroxycholesterol; oxysterols
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Funding
- Japan Society for the Promotion of Science [20591309, 21790633, 22590747]
- Health Labour Sciences Research (the intractable hepato-biliary disease study group in Japan)
- Grants-in-Aid for Scientific Research [22590747, 20591309, 21790633] Funding Source: KAKEN
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To date, many studies have been conducted using 25-hydroxycholesterol, which is a potent regulator of lipid metabolism. However, the origins of this oxysterol have not been entirely elucidated. Cholesterol 25-hydroxylase is one of the enzymes responsible for the metabolism of 25-hydroxycholesterol, but the expression of this enzyme is very low in humans. This oxysterol is also synthesized by sterol 27-hydroxylase (CYP27A1) and cholesterol 24-hydroxylase(CYP46A1), but it is only a minor product of these enzymes. We now report that CYP3A synthesizes a significant amount of 25-hydroxycholesterol and may participate in the regulation of lipid metabolism. Induction of CYP3A by pregnenolone-16 alpha-carbonitrile caused the accumulation of 25-hydroxycholesterol in a cell line derived from mouse liver. Furthermore, treatment of the cells with troleandomycin, a specific inhibitor of CYP3A, significantly reduced cellular 25-hydroxycholesterol concentrations. In cells that overexpressed human recombinant CYP3A4, the activity of cholesterol 25-hydroxylation was found to be higher than that of cholesterol 4 beta-hydroxylation, a known marker activity of CYP3A4. In addition, 25-hydroxycholesterol concentrations in normal human sera correlated positively with the levels of 4 beta-hydroxycholesterol (r = 0.650, P < 0.0001, n = 78), but did not significantly correlate with the levels of 27-hydroxycholesterol or 24S-hydroxycholesterol. These results demonstrate the significance of CYP3A on the production of 25-hydroxycholesterol.-Honda, A., T. Miyazaki, T. Ikegami, J. Iwamoto, T. Maeda, T. Hirayama, Y. Saito, T. Teramoto, and Y. Matsuzaki. Cholesterol 25-hydroxylation activity of CYP3A. J. Lipid Res. 2011. 52: 1509-1516.
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