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Lysophosphatidic acid-induced arterial wall remodeling: requirement of PPARgamma but not LPA1 or LPA2 GPCR.

Abstract：

:Lysophosphatidic acid (LPA) and its ether analog alkyl-glycerophosphate (AGP) elicit arterial wall remodeling when applied intralumenally into the uninjured carotid artery. LPA is the ligand of eight GPCRs and the peroxisome proliferator-activated receptor gamma (PPARgamma). We pursued a gene knockout strategy to identify the LPA receptor subtypes necessary for the neointimal response in a non-injury model of carotid remodeling and also compared the effects of AGP and the PPARgamma agonist rosiglitazone (ROSI) on balloon injury-elicited neointima development. In the balloon injury model AGP significantly increased neointima; however, rosiglitazone application attenuated it. AGP and ROSI were also applied intralumenally for 1h without injury into the carotid arteries of LPA(1), LPA(2), LPA(1&2) double knockout, and Mx1Cre-inducible conditional PPARgamma knockout mice targeted to vascular smooth muscle cells, macrophages, and endothelial cells. The neointima was quantified and also stained for CD31, CD68, CD11b, and alpha-smooth muscle actin markers. In LPA(1), LPA(2), LPA(1&2) GPCR knockout, Mx1Cre transgenic, PPARgamma(fl/-), and uninduced Mx1CrexPPARgamma(fl/-) mice AGP- and ROSI-elicited neointima was indistinguishable in its progression and cytological features from that of WT C57BL/6 mice. In PPARgamma(-/-) knockout mice, generated by activation of Mx1Cre-mediated recombination, AGP and ROSI failed to elicit neointima and vascular wall remodeling. Our findings point to a difference in the effects of AGP and ROSI between the balloon injury- and the non-injury chemically-induced neointima. The present data provide genetic evidence for the requirement of PPARgamma in AGP- and ROSI-elicited neointimal thickening in the non-injury model and reveal that the overwhelming majority of the cells in the neointimal layer express alpha-smooth muscle actin.

journal_name

Cell Signal

journal_title

Cellular signalling

authors

Cheng Y,Makarova N,Tsukahara R,Guo H,Shuyu E,Farrar P,Balazs L,Zhang C,Tigyi G

doi

10.1016/j.cellsig.2009.08.003

subject

Has Abstract

pub_date

2009-12-01 00:00:00

pages

1874-84

issue

12

eissn

0898-6568

issn

1873-3913

pii

S0898-6568(09)00242-3

journal_volume

21

pub_type

杂志文章

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