Endo, JinSano, MotoakiIsobe, YosukeFukuda, KeiichiKang, JingArai, HiroyukiArita, Makoto2015-02-022014Endo, Jin, Motoaki Sano, Yosuke Isobe, Keiichi Fukuda, Jing X. Kang, Hiroyuki Arai, and Makoto Arita. 2014. “18-HEPE, an n-3 fatty acid metabolite released by macrophages, prevents pressure overload–induced maladaptive cardiac remodeling.” The Journal of Experimental Medicine 211 (8): 1673-1687. doi:10.1084/jem.20132011. http://dx.doi.org/10.1084/jem.20132011.0022-1007http://nrs.harvard.edu/urn-3:HUL.InstRepos:13890733N-3 polyunsaturated fatty acids (PUFAs) have potential cardiovascular benefit, although the mechanisms underlying this effect remain poorly understood. Fat-1 transgenic mice expressing Caenorhabditis elegans n-3 fatty acid desaturase, which is capable of producing n-3 PUFAs from n-6 PUFAs, exhibited resistance to pressure overload–induced inflammation and fibrosis, as well as reduced cardiac function. Lipidomic analysis revealed selective enrichment of eicosapentaenoic acid (EPA) in fat-1 transgenic bone marrow (BM) cells and EPA-metabolite 18-hydroxyeicosapentaenoic acid (18-HEPE) in fat-1 transgenic macrophages. BM transplantation experiments revealed that fat-1 transgenic BM cells, but not fat-1 transgenic cardiac cells, contributed to the antiremodeling effect and that the 18-HEPE–rich milieu in the fat-1 transgenic heart was generated by BM-derived cells, most likely macrophages. 18-HEPE inhibited macrophage-mediated proinflammatory activation of cardiac fibroblasts in culture, and in vivo administration of 18-HEPE reproduced the fat-1 mice phenotype, including resistance to pressure overload–induced maladaptive cardiac remodeling.en-USJournal Article2015-02-0210.1084/jem.20132011