title: 4-Hydroxynonenal enhances MMP-9 production in murine macrophages via 5-lipoxygenase-mediated activation of ERK and p38 MAPK.
abstract: Exaggerated levels of 4-hydroxynonenal (HNE) and 5-lipoxygenase (5-LO) co-exist in macrophages in atherosclerotic lesions, and activated macrophages produce MMP-9 that degrades atherosclerotic plaque constituents. This study investigated the effects of HNE on MMP-9 production, and the potential role for 5-LO derivatives in MMP-9 production in murine macrophages. Stimulation of J774A.1 cells with HNE led to activation of 5-LO, as measured by leukotriene B(4) (LTB(4)) production. This was associated with an increased production of MMP-9, which was blunted by inhibition of 5-LO with MK886, a 5-LO inhibitor or with 5-LO siRNA. A cysteinyl-LT(1) (cysLT(1)) receptor antagonist, REV-5901 as well as a BLT(1) receptor antagonist, U-75302, also attenuated MMP-9 production induced by HNE. Furthermore, LTB(4) and cysLT (LTC(4) and LTD(4)) enhanced MMP-9 production in macrophages, suggesting a pivotal role for 5-LO in HNE-mediated production of MMP-9. Among the MAPK pathways, LTB(4) and cysLT enhanced phosphorylation of ERK and p38 MAPK, but not JNK. Linked to these results, a p38 MAPK inhibitor as well as an ERK inhibitor blunted MMP-9 production induced by LT. Collectively, these data suggest that 5-LO-derived LT mediates HNE-induced MMP-9 production via activation of ERK and p38 MAPK pathways, consequently leading to plaque instability in atherosclerosis.
authors.affiliation: Department of Pharmacology and BK21 Medical Science Education Center, School of Medicine, Pusan National University, Yangsan, Gyeongnam 626-870, Korea.
authors.forename: Seung J
authors.initials: SJ
authors.lastname: Lee
authors.forename: Chae E
authors.initials: CE
authors.lastname: Kim
authors.forename: Mi R
authors.initials: MR
authors.lastname: Yun
authors.forename: Kyo W
authors.initials: KW
authors.lastname: Seo
authors.forename: Hye M
authors.initials: HM
authors.lastname: Park
authors.forename: Jung W
authors.initials: JW
authors.lastname: Yun
authors.forename: Hwa K
authors.initials: HK
authors.lastname: Shin
authors.forename: Sun S
authors.initials: SS
authors.lastname: Bae
authors.forename: Chi D
authors.initials: CD
authors.lastname: Kim
mesh_terms: D000447:Aldehydes / Q000633:toxicity*; D000818:Animals; D001094:Arachidonate 5-Lipoxygenase / Q000378:metabolism*; D001483:Base Sequence; D017931:DNA Primers; D048049:Extracellular Signal-Regulated MAP Kinases / Q000378:metabolism*; D017737:Macrophages, Peritoneal / Q000187:drug effects* / Q000201:enzymology; D020780:Matrix Metalloproteinase 9 / Q000096:biosynthesis*; D051379:Mice; D008810:Mice, Inbred C57BL; D020133:Reverse Transcriptase Polymerase Chain Reaction; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism*
chemical_list: D000447:Aldehydes; D017931:DNA Primers; D001094:Arachidonate 5-Lipoxygenase; D048049:Extracellular Signal-Regulated MAP Kinases; D048051:p38 Mitogen-Activated Protein Kinases; D020780:Matrix Metalloproteinase 9; C027576:4-hydroxy-2-nonenal