title: Down-regulation of interleukin-1beta production and PGE2 accumulation by an indomethacin-phenylalanine derivative in human monocytes.
abstract: This study was initiated to investigate the mechanism of action of a new indomethacin derivative, indomethacin-phenylalanine (indo-Phe) in human monocytes. We determined the effect of indo-Phe on the induction by LPS of prostaglandin-E2 (PGE2) and interleukin-1beta (IL-1beta) production in human monocytes. Indomethacin and indo-Phe inhibited the PGE2 synthesis in treated and untreated IL-1beta or LPS-treated monocytes. Furthermore, in IL-1beta and LPS-treated monocytes, prostaglandin G/H synthase-1 (PGHS-1) protein expression was down-regulated with indomethacin or its indo-Phe analog whereas the level of the inducible protein (PGHS-2) was up-regulated. We analyzed the effect of indomethacin and indo-Phe on the expression of IL-1beta protein in LPS-treated monocytes and found that indo-Phe blocked the LPS-induction of IL-1beta synthesis while indomethacin did not. These differential effects of indomethacin and indo-Phe suggest that two independent ways are involved in the stimulation of monocytes by LPS: the PGHS-2 protein induction and the IL-1beta secretion.
authors.affiliation: Unité de Biotechnologie, Institut des Biomatériaux, CHUQ, Québec, Canada. patrick.poyet@bcx.ulaval.ca
authors.forename: P
authors.initials: P
authors.lastname: Poyet
authors.forename: F
authors.initials: F
authors.lastname: Doualla-Bell
authors.forename: D
authors.initials: D
authors.lastname: Lévesque
authors.forename: N
authors.initials: N
authors.lastname: Ritchot
authors.forename: J M
authors.initials: JM
authors.lastname: Guay
authors.forename: F
authors.initials: F
authors.lastname: Marceau
authors.forename: R C
authors.initials: RC
authors.lastname: Gaudreault
mesh_terms: D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000494:pharmacology*; D002478:Cells, Cultured; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; D015232:Dinoprostone / Q000378:metabolism*; D015536:Down-Regulation; D004797:Enzyme-Linked Immunosorbent Assay; D006801:Humans; D007213:Indomethacin / Q000031:analogs & derivatives / Q000494:pharmacology*; D007375:Interleukin-1 / Q000378:metabolism*; D007527:Isoenzymes / Q000378:metabolism; D008070:Lipopolysaccharides / Q000494:pharmacology; D008565:Membrane Proteins; D009000:Monocytes / Q000187:drug effects* / Q000378:metabolism; D010649:Phenylalanine / Q000494:pharmacology*; D011451:Prostaglandin-Endoperoxide Synthases / Q000378:metabolism
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D007375:Interleukin-1; D007527:Isoenzymes; D008070:Lipopolysaccharides; D008565:Membrane Proteins; D010649:Phenylalanine; D051545:Cyclooxygenase 1; D051546:Cyclooxygenase 2; C496511:PTGS1 protein, human; C496540:PTGS2 protein, human; D011451:Prostaglandin-Endoperoxide Synthases; D015232:Dinoprostone; D007213:Indomethacin