Oxidized low density lipoprotein activates peroxisome proliferator-activated receptor-alpha (PPARalpha) and PPARgamma through MAPK-dependent COX-2 expression in macrophages

The Journal of Biological Chemistry
Kayo TaketaEiichi Araki

Abstract

It has been reported that oxidized low density lipoprotein (Ox-LDL) can activate both peroxisome proliferator-activated receptor-alpha (PPARalpha) and PPARgamma. However, the detailed mechanisms of Ox-LDL-induced PPARalpha and PPARgamma activation are not fully understood. In the present study, we investigated the effect of Ox-LDL on PPARalpha and PPARgamma activation in macrophages. Ox-LDL, but not LDL, induced PPARalpha and PPARgamma activation in a dose-dependent manner. Ox-LDL transiently induced cyclooxygenase-2 (COX-2) mRNA and protein expression, and COX-2 specific inhibition by NS-398 or meloxicam or small interference RNA of COX-2 suppressed Ox-LDL-induced PPARalpha and PPARgamma activation. Ox-LDL induced phosphorylation of ERK1/2 and p38 MAPK, and ERK1/2 specific inhibition abrogated Ox-LDL-induced COX-2 expression and PPARalpha and PPARgamma activation, whereas p38 MAPK-specific inhibition had no effect. Ox-LDL decreased the amounts of intracellular long chain fatty acids, such as arachidonic, linoleic, oleic, and docosahexaenoic acids. On the other hand, Ox-LDL increased intracellular 15-deoxy-Delta(12,14)-prostaglandin J(2) (15d-PGJ(2)) level through ERK1/2-dependent overexpression of COX-2. Moreover, 15d-PGJ(2) i...Continue Reading

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Citations

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