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- W2106631347 abstract "Effective postinfarction repair requires timely suppression of innate immune signals to prevent the catastrophic consequences of uncontrolled inflammation on cardiac geometry and function. In macrophages, interleukin-1 receptor-associated kinase (IRAK)-M acts as a functional decoy preventing uncontrolled toll-like receptor /interleukin-1-mediated responses. Our study investigates the role of IRAK-M as a negative regulator of the postinfarction inflammatory response and as a modulator of cardiac remodeling.In wild-type mouse infarcts IRAK-M was upregulated in infiltrating macrophages and fibroblasts exhibiting a biphasic response. When compared with wild-type animals, infarcted IRAK-M(-/-) mice had enhanced adverse remodeling and worse systolic dysfunction; however, acute infarct size was comparable between groups. Adverse remodeling in IRAK-M(-/-) animals was associated with enhanced myocardial inflammation and protease activation. The protective actions of IRAK-M involved phenotypic modulation of macrophages and fibroblasts. IRAK-M(-/-) infarcts showed increased infiltration with proinflammatory CD11b+/Ly6C(hi) monocytes; leukocytes harvested from IRAK-M-null infarcts exhibited accentuated cytokine expression. In vitro, IRAK-M expression was upregulated in cytokine-stimulated murine cardiac fibroblasts and suppressed their matrix-degrading properties without affecting their inflammatory activity.Endogenous IRAK-M attenuates adverse postinfarction remodeling suppressing leukocyte inflammatory activity, while inhibiting fibroblast-mediated matrix degradation." @default.
- W2106631347 created "2016-06-24" @default.
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- W2106631347 date "2012-11-01" @default.
- W2106631347 modified "2023-10-15" @default.
- W2106631347 title "Endogenous IRAK-M Attenuates Postinfarction Remodeling Through Effects on Macrophages and Fibroblasts" @default.
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- W2106631347 doi "https://doi.org/10.1161/atvbaha.112.300310" @default.
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