A lipid peroxidation-derived inflammatory mediator: identification of 4-hydroxy-2-nonenal as a potential inducer of cyclooxygenase-2 in macrophages

The Journal of Biological Chemistry
T KumagaiKoji Uchida

Abstract

Cyclooxygenases (COXs) catalyze the conversion of arachidonic acid to eicosanoids, which mediate a variety of biological actions involved in vascular pathophysiology. In the present study, we investigated the role of lipid peroxidation products in the up-regulation of COX-2, an inducible isoform responsible for high levels of prostaglandin production during inflammation and immune responses. COX-2 was found to colocalize with 4-hydroxy-2-nonenal (HNE), a major lipid peroxidation-derived aldehyde, in foamy macrophages within human atheromatous lesions, suggesting that COX-2 expression may be associated with the accumulation of lipid peroxidation products within macrophages. To test the hypothesis that lipid peroxidation products might be involved in the regulation of prostanoid biosynthesis, we conducted a screen of oxidized fatty acid metabolites and found that, among the compounds tested, only HNE showed inducibility of the COX-2 protein in RAW264.7 macrophages. In addition, intraperitoneal administration of HNE resulted in an increase in cell numbers in the peritoneal cavity that was associated with significant increases in the peritoneal and tissue levels of COX-2 in mice. To understand the possible signaling mechanism under...Continue Reading

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