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2018 ; 118
(ä): 70-80
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Genetic deletion of 12/15 lipoxygenase promotes effective resolution of
inflammation following myocardial infarction
#MMPMID29526491
Kain V
; Ingle KA
; Kabarowski J
; Barnes S
; Limdi NA
; Prabhu SD
; Halade GV
J Mol Cell Cardiol
2018[May]; 118
(ä): 70-80
PMID29526491
show ga
12/15 lipoxygenase (LOX) directs inflammation and lipid remodeling. However, the
role of 12/15LOX in post-myocardial infarction (MI) left ventricular remodeling
is unclear. To determine the role of 12/15LOX, 8-12?week-old C57BL/6?J wild-type
(WT; n?=?93) and 12/15LOX(-/-) (n?=?97) mice were subjected to permanent coronary
artery ligation and monitored at day (d)1 and d5 post-operatively. Post-MI d28
survival was measured in male and female mice. No-MI surgery mice were maintained
as d0 naïve controls. 12/15LOX(-/-) mice exhibited higher survival rates with
lower cardiac rupture and improved LV function as compared with WT post-MI.
Compared to WT, neutrophils and macrophages in 12/15LOX(-/-) mice were polarized
towards N2 and M2 phenotypes, respectively, with increased of expression mrc-1,
ym-1, and arg-1 post-MI. 12/15LOX(-/-) mice exhibited lower levels of
pro-inflammatory 12-(S)-hydroperoxyeicosatetraenoic acid (12(S)-HETE) and higher
CYP2J-derived epoxyeicosatrienoic acids (EETs) levels. CYP2J-derived 5,6-, 8,9-,
11,12-, and 14,15-EETs activated macrophage-specific hemeoxygenase (HO)-1 marked
with increases in F4/80(+)/Ly6C(low) and F4/80(+)/CD206(high) cells at d5 post-MI
in 12/15LOX(-/-) mice. In contrast, inhibition of HO-1 led to total mortality in
12/15LOX(-/-) mice by post-MI d5. 12/15LOX(-/-) mice exhibited reduced collagen
density and lower ?-smooth muscle actin (SMA) expression at d5 post-MI,
indicating delayed or limited fibroblast-to-myofibroblast differentiation. In
conclusion, genetic deletion of 12/15LOX reduces 12(S)-HETE and activates
CYP2J-derived EETs to promote effective resolution of inflammation post-MI
leading to reduced cardiac rupture, improved LV function, and better survival.