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Sulfation of 25-hydroxycholesterol by SULT2B1b decreases cellular lipids via the LXR/SREBP-1c signaling pathway in human aortic endothelial cells.

Abstract：

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 (3)H-25HC was sulfated in 24h 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.

journal_name

Atherosclerosis

journal_title

Atherosclerosis

authors

Bai Q,Xu L,Kakiyama G,Runge-Morris MA,Hylemon PB,Yin L,Pandak WM,Ren S

doi

10.1016/j.atherosclerosis.2010.11.021

subject

Has Abstract

pub_date

2011-02-01 00:00:00

pages

350-6

issue

2

eissn

0021-9150

issn

1879-1484

pii

S0021-9150(10)00959-7

journal_volume

214

pub_type

杂志文章

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