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Aging is associated with an overt inflammatory phenotype and physiological decline. Specialized proresolving lipid mediators (SPMs) are endogenous autacoids that actively promote resolution of inflammation. In this study, we investigated resolution of acute inflammation in aging and the roles of SPMs. Using a self-resolving peritonitis and resolution indices coupled with lipid mediator metabololipidomics, we found that aged mice had both delayed resolution and reduced SPMs. The SPM precursor docosahexaenoic acid accelerated resolution via increased SPMs and promoted human monocyte reprogramming. In aged mice, novel nano-proresolving medicines carrying aspirin-triggered resolvins D1 and D3 reduced inflammation by promoting efferocytosis. These findings provide evidence for age-dependent resolution pathways in acute inflammation and novel means to activate resolution.

Aging Delays Resolution of Acute Inflammation in Mice: Reprogramming the Host Response with Novel Nano-Proresolving Medicines