Fatty acid transduction of nitric oxide signaling: nitrolinoleic acid potently activates endothelial heme oxygenase 1 expression

Proceedings of the National Academy of Sciences of the United States of America
Marcienne M WrightAnupam Agarwal

Abstract

Nitroalkenes are a class of cell signaling mediators generated by NO and fatty acid-dependent redox reactions. Nitrated fatty acids such as 10- and 12-nitro-9,12-octadecadienoic acid (nitrolinoleic acid, LNO(2)) exhibit pluripotent antiinflammatory cell signaling properties. Heme oxygenase 1 (HO-1) is up-regulated as an adaptive response to inflammatory mediators and oxidative stress. LNO(2) (1-10 microM) induced HO-1 mRNA and protein up to 70- and 15-fold, respectively, in human aortic endothelial cells. This induction of HO-1 occurred within clinical LNO(2) concentration ranges, far exceeded responses to equimolar amounts of linoleic acid and oxidized linoleic acid, and rivaled that induced by hemin. Ex vivo incubation of rat aortic segments with 25 microM LNO(2) resulted in a 40-fold induction of HO-1 protein that localized to endothelial and smooth muscle cells. Actinomycin D inhibited LNO(2) induction of HO-1 in human aortic endothelial cells, and LNO(2) activated a 4.5-kb human HO-1 promoter construct, indicating transcriptional regulation of the HO-1 gene. The peroxisome proliferator-activated receptor gamma (PPARgamma) receptor antagonist GW9662 did not inhibit LNO(2)-mediated HO-1 induction, and a methyl ester derivati...Continue Reading

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