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Essential roles of sphingosine 1-phosphate receptor types 1 and 3 in human hepatic stellate cells motility and activation.

Abstract：

:The biological roles of sphingosine 1-phosphate (S1P) and S1P receptors (S1PRs) have been broadly investigated. However, at present pathophysiological roles of S1P/S1PRs axis in liver fibrosis are not well defined. Here, we investigated the functions of S1P/S1PRs axis in human hepatic stellate cells (HSC) line, LX-2 cells. We found that S1PR types 1, 2 and 3 (S1PR1-3) are clearly detected in LX-2 cells, as determined by RT-PCR, Western blot and immunocytochemistry analysis. S1P exerted a powerful migratory action on LX-2 cells, as determined in Boyden chambers, and stimulated fibrogenic activity of LX-2 cells, as demonstrated by increase of expression of smooth muscle α-actin, procollagen α1(I) and α1(III) and total hydroxyproline content. Moreover, the effects of S1P were mimicked by S1PR1 agonist SEW2871, and abrogated by W146 (S1PR1 antagonist) and/or silencing S1PR1, three expression with small interfering RNA, suggesting the main roles of S1PR1 and 3. However, studies with S1PR2 antagonist JTE-013 and silencing S1PR2 expression indicated that S1PR2 negatively regulated S1P-induced cell migration. Interestingly, exogenously added S1P induced significant up-regulation of sphingosine kinase-1 and the synthesis of additional S1P, and expression of S1PR1,3, but not S1PR2. In conclusion, our data have identified an additional function regulated by S1P/S1PR1,3 axis involving migration and fibrogenic activation of HSCs. These results suggest that selective modulation of S1PR activity may represent a new antifibrotic strategy.

journal_name

J Cell Physiol

journal_title

Journal of cellular physiology

authors

Liu X,Yue S,Li C,Yang L,You H,Li L

doi

10.1002/jcp.22572

subject

Has Abstract

pub_date

2011-09-01 00:00:00

pages

2370-7

issue

9

eissn

0021-9541

issn

1097-4652

journal_volume

226

pub_type

杂志文章

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