Article ID Journal Published Year Pages File Type
1992326 The Journal of Steroid Biochemistry and Molecular Biology 2007 7 Pages PDF
Abstract
Microsomal prostaglandin E synthase (mPGES)-1, which is dramatically induced in macrophages by inflammatory stimuli such as lipopolysaccharide (LPS), catalyzes the conversion of cyclooxygenase-2 (COX-2) reaction product prostaglandin H2 (PGH2) into prostaglandin E2 (PGE2). The mPGES-1-derived PGE2 is thought to help regulate inflammatory responses. On the other hand, excess PGE2 derived from mPGES-1 contributes to the development of inflammatory diseases such as arthritis and inflammatory pain. Here, we examined the effects of liver X receptor (LXR) ligands on LPS-induced mPGES-1 expression in murine peritoneal macrophages. The LXR ligands 22(R)-hydroxycholesterol (22R-HC) and T0901317 reduced LPS-induced expression of mPGES-1 mRNA and mPGES-1 protein as well as that of COX-2 protein. However, LXR ligands did not influence the expression of microsomal PGES-2 (mPGES-2) or cytosolic PGES (cPGES) protein. Consequently, LXR ligands suppressed the production of PGE2 in macrophages. These results suggest that LXR ligands diminish PGE2 production by inhibiting the LPS-induced gene expression of the COX-2-mPGES-1 axis in LPS-activated macrophages.
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Life Sciences Biochemistry, Genetics and Molecular Biology Biochemistry
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