期刊
ATHEROSCLEROSIS
卷 214, 期 2, 页码 350-356出版社
ELSEVIER IRELAND LTD
DOI: 10.1016/j.atherosclerosis.2010.11.021
关键词
Cytosolic sulfotransferase (SULT2B1b); 25-Hydroxycholesterol (25HC); 25-Hydroxycholesterol-3-sulfate (25HC3S); Oxysterol sulfation; Lipid metabolism
资金
- National Institutes of Health [R01 HL078898]
- Veterans Administration Department
- NIEHS [ES005823]
Objective: 25-Hydroxycholesterol (25HC) and its sulfated metabolite, 25-hydroxycholesterol-3-sulfate (25HC3S), regulate certain aspects of lipid metabolism in opposite ways. Hence, the enzyme for the biosynthesis of 25HC3S, oxysterol sulfotransferase (SULT2B1b), may play a crucial role in regulating lipid metabolism. We evaluate the effect of 25HC sulfation on lipid metabolism by overexpressing the gene encoding SULT2B1b in human aortic endothelial cells (HAECs) in culture. Methods and results: The human SULT2B1b gene was successfully overexpressed in HAECs following infection using a recombinant adenovirus. HPLC analysis demonstrated that more than 50% of H-3-25HC was sulfated in 24 h following overexpression of the SULT2B1b gene. In the presence of 25HC, SULT2B1b overexpression significantly decreased mRNA and protein levels of LXR, ABCA1, SREBP-1c, ACC-1, and FAS, which are key regulators of lipid biosynthesis and transport; and subsequently reduced cellular lipid levels. Overexpression of the gene encoding SULT2B1b gave similar results as adding exogenous 25HC3S. However, in the absence of 25HC or in the presence of T0901317, synthetic liver oxysterol receptor (LXR) agonist, SULT2B1b overexpression had no effect on the regulation of key genes involved in lipid metabolism. Conclusions: Our data indicate that sulfation of 25HC by SULT2B1b plays an important role in the maintenance of intracellular lipid homeostasis via the LXR/SREBP-1c signaling pathway in HAECs. (C) 2010 Elsevier Ireland Ltd. All rights reserved.
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