Acrolein increases 5-lipoxygenase expression in murine macrophages through activation of ERK pathway.
Episodic exposure to acrolein-rich pollutants has been linked to acute myocardial infarction, and 5-lipoxygenase (5-LO) is involved in the production of matrix metalloproteinase-9 (MMP-9), which destabilizes atherosclerotic plaques. Thus, the present study determined the effect of acrolein on 5-LO/leukotriene B(4) (LTB(4)) production in murine macrophages. Stimulation of J774A.1 cells with acrolein led to increased LTB(4) production in association with increased 5-LO expression. Acrolein-evoked 5-LO expression was blocked by pharmacological inhibition of the ERK pathway, but not by inhibitors for JNK and p38 MAPK pathways. In line with these results, acrolein exclusively increased the phosphorylation of ERK among these MAPK, suggesting a role for the ERK pathway in acrolein-induced 5-LO expression with subsequent production of LTB(4). Among the receptor tyrosine kinases including epidermal growth factor receptor (EGFR) and platelet derived growth factor receptor (PDGFR), acrolein-evoked ERK phosphorylation was attenuated by AG1478, an EGFR inhibitor, but not by AG1295, a PDGFR inhibitor. In addition, acrolein-evoked 5-LO expression was also inhibited by inhibition of EGFR pathway, but not by inhibition of PDGFR pathway. These observations suggest that acrolein has a profound effect on the 5-LO pathway via an EGFR-mediated activation of ERK pathway, leading to acute ischemic syndromes through the generation of LTB(4), subsequent MMP-9 production and plaque rupture.
Department of Pharmacology, Pusan National University, Yangsan, Gyeongnam 626-870, Korea.
Chae E
CE
Kim
Seung J
SJ
Lee
Kyo W
KW
Seo
Hye M
HM
Park
Jung W
JW
Yun
Jin U
JU
Bae
Sun S
SS
Bae
Chi D
CD
Kim
D000171:Acrolein / Q000633:toxicity*; D000818:Animals; D001094:Arachidonate 5-Lipoxygenase / Q000378:metabolism*; D002460:Cell Line; D004785:Environmental Pollutants / Q000633:toxicity*; D066246:ErbB Receptors / Q000378:metabolism; D048049:Extracellular Signal-Regulated MAP Kinases / Q000037:antagonists & inhibitors / Q000378:metabolism*; D007975:Leukotriene B4 / Q000378:metabolism; D020935:MAP Kinase Signaling System; D008264:Macrophages / Q000187:drug effects / Q000201:enzymology*; D020780:Matrix Metalloproteinase 9 / Q000378:metabolism; D051379:Mice; D010766:Phosphorylation / Q000187:drug effects
D004785:Environmental Pollutants; D007975:Leukotriene B4; D000171:Acrolein; D001094:Arachidonate 5-Lipoxygenase; D066246:ErbB Receptors; D048049:Extracellular Signal-Regulated MAP Kinases; D020780:Matrix Metalloproteinase 9