Resolution Agonist 15-Epi-Lipoxin A4 Programs Early Activation of Resolving Phase in Post-Myocardial Infarction Healing
Digital Object Identifier (DOI)
Following myocardial infarction (MI), overactive inflammation remodels the left ventricle (LV) leading to heart failure coinciding with reduced levels of 15-epi-Lipoxin A4 (15-epi LXA4). However, the role of 15-epi LXA4 in post-MI acute inflammatory response and resolving phase is unclear. We hypothesize that liposomal fusion of 15-epi-LXA4 (Lipo-15-epi-LXA4) or free 15-epi-LXA4 will expedite the resolving phase in post-MI inflammation. 8 to 12-week-old male C57BL/6 mice were subjected to permanent coronary artery ligation. Lipo-15-epi-LXA4 or 15-epi-LXA4 (1 μg/kg/day) was injected 3 hours post-MI for (d)1 or continued daily till d5. 15-epi-LXA4 activated formyl peptide receptor (FPR2) and GPR120 on alternative macrophages but inhibited GPR40 on classical macrophages in-vitro. The 15-epi-LXA4 injected mice displayed reduced LV and lung mass to body weight ratios and improved ejection fraction at d5 post-MI. In the acute phase of inflammation-(d1), 15-epi-LXA4 primes neutrophil infiltration with a robust increase of Ccl2 and FPR2 expression. During the resolving phase-(d5), 15-epi-LXA4 initiated rapid neutrophils clearance with persistent activation of FPR2 in LV. Compared to MI-control, 15-epi-LXA4 injected mice showed reduced renal inflammation along with decreased levels of ngal and plasma creatinine. In summary, 15-epi-LXA4 initiates the resolving phase early to discontinue inflammation post-MI, thereby reducing LV dysfunction.
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Citation / Publisher Attribution
Scientific Reports, v. 7, issue 1, art. 9999
Scholar Commons Citation
Kain, Vasundhara; Liu, Fei; Kozlovskaya, Veronika; Ingle, Kevin A.; Bolisetty, Subhashini; Agarwal, Anupam; Khedkar, Santosh; Prabhu, Sumanth D.; Kharlampieva, Eugenia; and Halade, Ganesh V., "Resolution Agonist 15-Epi-Lipoxin A4 Programs Early Activation of Resolving Phase in Post-Myocardial Infarction Healing" (2017). Internal Medicine Faculty Publications. 31.