Serum-glucocorticoid regulated kinase 1 regulates alternatively activated macrophage polarization contributing to angiotensin II-induced inflammation and cardiac fibrosis.

Arteriosclerosis, Thrombosis, and Vascular Biology
Min YangJie Du

Abstract

Inflammatory responses play a pivotal role in the pathogenesis of hypertensive cardiac remodeling. Macrophage recruitment and polarization contribute to the development of cardiac fibrosis. Although serum-glucocorticoid regulated kinase 1 (SGK1) is a key mediator of fibrosis, its role in regulating macrophage function leading to cardiac fibrosis has not been investigated. We aimed to determine the mechanism by which SGK1 regulates the cardiac inflammatory process, thus contributing to hypertensive cardiac fibrosis. After angiotensin II infusion in mice, cardiac hypertrophy and fibrosis developed in wild-type but not SGK1 knockout mice, with equal levels of hypertension in both groups. Compared with wild-type hearts, SGK1 knockout hearts showed less infiltration of leukocytes and macrophages. Importantly, SGK1 deficiency led to decreased proportion of alternatively activated (M2) macrophages and increased levels of profibrotic cytokines. Angiotensin II infusion induced phosphorylation and nuclear localization of signal transducer and activator of transcription 3 (STAT3) whereas SGK1 knockout hearts showed this effect attenuated. In a 3-dimensional peptide gel culture, inhibition of STAT3 suppressed differentiation into M2 macrop...Continue Reading

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