Abstract
In the process of physiological cardiac repair, splenic leukocyte-activated lipoxygenases (LOXs) are essential for the biosynthesis of specialized pro-resolving lipid mediators as a segment of an active process of acute inflammation in splenocardiac manner. In contrast, young 12/15LOX−/− mice use a compensatory mechanism that amplifies epoxyeicosatrienoic acid mediators after myocardial infarction, improving cardiac repair, function, and survival. Next, we tested whether deletion of 12/15LOX impacted the genesis of chronic inflammation in progressive aging. To test the risk factor of aging, we used the inter-organ hypothesis and assessed heart and spleen leukocyte population along with the number of inflammation markers in age-related 12/15LOX−/− aging mice (2 months, 6 months, 13 months) and compared with C57BL/6 J (WT; wild type) as controls (2 months). The 12/15LOX−/− aging mice showed an age-related increase in spleen mass (hypersplenism) and decreased marginal zone area. Results suggest increased interstitial fibrosis in the heart marked with the inflammatory mediator (PGD2) level in 12/15LOX−/− aging mice than WT controls. From a cellular perspective, the quantitative measurement of immune cells indicates that heart and spleen leukocytes (CD11b+ and F4/80+ population) were reduced in 12/15LOX−/− aging mice than WT controls. At the molecular level, analyses of cytokines in the heart and spleen suggest amplified IFN-γ, with reduced COX-1, COX-2, and ALOX5 expression in the absence of 12/15LOX-derived mediators in the spleen. Thus, aging of 12/15LOX−/− mice increased spleen mass and altered spleen and heart structure with activation of multiple molecular and cellular pathways contributing to age-related integrative and inter-organ inflammation.
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This work was supported in part by the National Institutes of Health (HL132989 and HL144788) to GVH.
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11357_2021_496_MOESM1_ESM.pptx
Fig. 1: Detailed flow cytometry strategy for LV and spleen mononuclear cells. Fig. 2: Aging of 12/15LOX-/- mice progressively increased fibrosis and cardiomyocyte area in the heart. (A). Scatter plot representing quantification of collagen density in left ventricular (LV) of 12/15LOX-/- aging mice. (B). Graph representing cardiomyocyte area of LV stained by wheat gram agglutinin (WGA). 4–5 images/mouse, n = 5 mice/group. Data is representative of average±SEM; *p<0.05 vs. WT (2mo), # p<0.05 vs. 12/15LOX-/- (2 mo) by one-way analysis of variance (ANOVA). (PPTX 99 KB)
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Kain, V., Mat, Y. & Halade, G.V. Interaction of aging with lipoxygenase deficiency initiates hypersplenism, cardiac dysfunction, and profound leukocyte directed non-resolving inflammation. GeroScience 44, 1689–1702 (2022). https://doi.org/10.1007/s11357-021-00496-x
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DOI: https://doi.org/10.1007/s11357-021-00496-x