The Journal of Experimental Medicine
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Published online 8 March 2004 doi:10.1084/jem.20031619
Rockefeller University Press, 0022-1007 $8.00
JEM, Volume 199, Number 6, 763-774
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Lysophosphatidic Acid Induces Neointima Formation Through PPAR{gamma} Activation

Chunxiang Zhang1, Daniel L. Baker1,2,3, Satoshi Yasuda3, Natalia Makarova3, Louisa Balazs4, Leonard R. Johnson3, Gopal K. Marathe5, Thomas M. McIntyre6, Yong Xu6, Glenn D. Prestwich6, Hoe-Sup Byun7, Robert Bittman7, and Gabor Tigyi3

1 The University of Tennessee Health Science Center, Vascular Biology Center or Excellence, 2 Genomics and Bioinformatics Center of Excellence, 3 Department of Physiology and 4 Department of Pathology, Memphis, TN 38163
5 The University of Utah, Program in Human Molecular Biology and Genetics, and 6 Department of Medicinal Chemistry and Center for Cell Signaling, Salt Lake City, UT 84108
7 Queens College of City University of New York, Department of Chemistry and Biochemistry, Flushing, NY 11367

Address correspondence to Gabor Tigyi, University of Tennessee Health Science Center, Dept. of Physiology, 894 Union Ave., Memphis, TN 38163. Phone: (901) 448-4793; Fax: (901) 448-7126; email: gtigyi{at}physio1.utmem.edu

Neointimal lesions are characterized by accumulation of cells within the arterial wall and are a prelude to atherosclerotic disease. Here we report that a brief exposure to either alkyl ether analogs of the growth factor–like phospholipid lysophosphatidic acid (LPA), products generated during the oxidative modification of low density lipoprotein, or to unsaturated acyl forms of LPA induce progressive formation of neointima in vivo in a rat carotid artery model. This effect is completely inhibited by the peroxisome proliferator-activated receptor (PPAR){gamma} antagonist GW9662 and mimicked by PPAR{gamma} agonists Rosiglitazone and 1-O-hexadecyl-2-azeleoyl-phosphatidylcholine. In contrast, stearoyl-oxovaleryl phosphatidylcholine, a PPAR{alpha} agonist and polypeptide epidermal growth factor, platelet-derived growth factor, and vascular endothelial growth factor failed to elicit neointima. The structure-activity relationship for neointima induction by LPA analogs in vivo is identical to that of PPAR{gamma} activation in vitro and disparate from that of LPA G protein–coupled receptor activation. Neointima-inducing LPA analogs up-regulated the CD36 scavenger receptor in vitro and in vivo and elicited dedifferentiation of cultured vascular smooth muscle cells that was prevented by GW9662. These results suggest that selected LPA analogs are important novel endogenous PPAR{gamma} ligands capable of mediating vascular remodeling and that activation of the nuclear transcription factor PPAR{gamma} is both necessary and sufficient for neointima formation by components of oxidized low density lipoprotein.

Key Words: neointima • LPA • PPAR • atherogenesis • lipid mediator


Abbreviations used in this paper: 1AGP, 1-octadecenyl-glycerophosphate; 3AGP, 3-O-octadecenyl-glycerophosphate; Acox, acyl-CoA oxidase; alkyl-GP, alkyl ether glycerophosphate; AZ-PC, 1-O-hexadecyl-2-azeleoyl-phosphatidylcholine; CCA, common carotid artery; cPA, 2,3-cyclic phosphatidic acid; DGPP, dioctylglycerol pyrophosphate; EGF, epidermal growth factor; GPCR, G protein–coupled receptor; hCAD, heavy caldesmon; IGF, insulin-like growth factor; LDL, low density lipoprotein; LPA, lysophosphatidic acid; moxLDL, minimally oxidized LDL; nLDL, native LDL; PAF, platelet-activating factor; PDGF, platelet-derived growth factor; PPAR, peroxisome proliferator-activated receptor; PPRE, PPAR response element; PTX, pertussis toxin; Rluc, renilla luciferase; Rosi, Rosiglitazone; S1P, sphingosine 1-phosphate; SOV-PC, stearoyl-oxovaleryl phosphatidylcholine; TZD, thiazolidinedione; VEGF, vascular endothelial growth factor; VSMC, vascular smooth muscle cell; XY-4, 1,1-difluorodeoxy-(2R)-palmitoyl-sn-glycero-3-phosphate; XY-8, 1-palmitoyl-(2R)-fluorodeoxy-sn-glycero-3-phosphate.

C. Zhang and D.L. Baker contributed equally to this work.


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