Macrophages modulate cardiac function in lipotoxic cardiomyopathy

Joel D. Schilling, Heather M. Machkovech, Alfred H.J. Kim, Reto Schwedwener, Jean E. Schaffer

Research output: Contribution to journalArticlepeer-review

32 Scopus citations

Abstract

Diabetes is associated with myocardial lipid accumulation and an increased risk of heart failure. Although cardiac myocyte lipid overload is thought to contribute to the pathogenesis of cardiomyopathy in the setting of diabetes, the mechanism(s) through which this occurs is not well understood. Increasingly, inflammation has been recognized as a key pathogenic feature of lipid excess and diabetes. In this study, we sought to investigate the role of inflammatory activation in the pathogenesis of lipotoxic cardiomyopathy using the α-myosin heavy chain promoter-driven long-chain acylCoA synthetase 1 (MHC-ACS) transgenic mouse model. We found that several inflammatory cytokines were upregulated in the myocardium of MHC-ACS mice before the onset of cardiac dysfunction, and this was accompanied by macrophage infiltration. Depletion of macrophages with liposomal clodrolip reduced the cardiac inflammatory response and improved cardiac function. Thus, in this model of lipotoxic cardiac injury, early induction of inflammation and macrophage recruitment contribute to adverse cardiac remodeling. These findings have implications for our understanding of heart failure in the setting of obesity and diabetes.

Original languageEnglish
Pages (from-to)H1366-H1373
JournalAmerican Journal of Physiology - Heart and Circulatory Physiology
Volume303
Issue number11
DOIs
StatePublished - Dec 1 2012

Keywords

  • Diabetes
  • Heart failure
  • Inflammation

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