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Atherogenic   ω  -6 lipids are physiological ligands of peroxisome proliferator-activated receptors (PPARs) and elicit pro- and antiatherogenic responses in vascular cells. The objective of this study was to investigate if   ω  -6 lipids modulated the early growth response-1 (Egr-1)/PPAR crosstalk thereby altering vascular function. Rat aortic smooth muscle cells (RASMCs) were exposed to   ω  -6 lipids, linoleic acid (LA), or its oxidized form, 13-HPODE (OxLA) in the presence or absence of a PPAR  α   antagonist (MK886) or PPAR  γ   antagonist (GW9662) or PPAR-specific siRNA. Our results demonstrate that   ω  -6 lipids, induced Egr-1 and monocyte chemotactic protein-1 (MCP-1) mRNA and protein levels at the acute phase (1–4 hrs) when PPAR  α   was downregulated and at subacute phase (4–12 hrs) by modulating PPAR  γ  , thus resulting in altered monocyte adhesion to RASMCs. We provide novel insights into the mechanism of action of   ω  -6 lipids on Egr-1/PPAR interactions in vascular cells and their potential in altering vascular function.

Atherogenic ω-6 Lipids Modulate PPAR- EGR-1 Crosstalk in Vascular Cells