Caveolin-1 deletion exacerbates cardiac interstitial fibrosis by promoting M2 macrophage activation in mice after myocardial infarction

Pooja Shivshankar, Ganesh V. Halade, Cheresa Calhoun, Gladys P. Escobar, Ali J. Mehr, Fabio Jimenez, Cindy Martinez, Harshita Bhatnagar, Corey H. Mjaatvedt, Merry L. Lindsey, Claude Jourdan Le Saux

Research output: Contribution to journalArticle

40 Scopus citations

Abstract

Adverse remodeling following myocardial infarction (MI) leading to heart failure is driven by an imbalanced resolution of inflammation. The macrophage cell is an important control of post-MI inflammation, as macrophage subtypes secrete mediators to either promote inflammation and extend injury (M1 phenotype) or suppress inflammation and promote scar formation (M2 phenotype). We have previously shown that the absence of caveolin-1 (Cav1), a membrane scaffolding protein, is associated with adverse cardiac remodeling in mice, but the mechanisms responsible remain to be elucidated. We explore here the role of Cav1 in the activation of macrophages using wild type C57BL6/J (WT) and Cav1tm1Mls/J (Cav1-/-) mice. By echocardiography, cardiac function was comparable between WT and Cav1-/- mice at 3days post-MI. In the absence of Cav1, there were a surprisingly higher percentage of M2 macrophages (arginase-1 positive) detected in the infarcted zone. Conversely, restoring Cav1 function after MI in WT mice by adding back the Cav1 scaffolding domain reduced the M2 activation profile. Further, adoptive transfer of Cav1 null macrophages into WT mice on d3 post-MI exacerbated adverse cardiac remodeling at d14 post-MI. In vitro studies revealed that Cav1 null macrophages had a more pronounced M2 profile activation in response to IL-4 stimulation. In conclusion, Cav1 deletion promotes an array of maladaptive repair processes after MI, including increased TGF-β signaling, increased M2 macrophage infiltration and dysregulation of the M1/M2 balance. Our data also suggest that cardiac remodeling can be improved by therapeutic intervention regulating Cav1 function during the inflammatory response phase.

Original languageEnglish (US)
Pages (from-to)84-93
Number of pages10
JournalCurrent Therapeutic Research - Clinical and Experimental
Volume76
DOIs
StatePublished - Nov 1 2014

Keywords

  • Caveolin-1
  • Inflammation
  • Interstitial fibrosis
  • Macrophage polarization
  • Myocardial infarction
  • Transforming growth factor β1 (TGF-β1)

ASJC Scopus subject areas

  • Pharmacology
  • Pharmacology (medical)

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    Shivshankar, P., Halade, G. V., Calhoun, C., Escobar, G. P., Mehr, A. J., Jimenez, F., Martinez, C., Bhatnagar, H., Mjaatvedt, C. H., Lindsey, M. L., & Le Saux, C. J. (2014). Caveolin-1 deletion exacerbates cardiac interstitial fibrosis by promoting M2 macrophage activation in mice after myocardial infarction. Current Therapeutic Research - Clinical and Experimental, 76, 84-93. https://doi.org/10.1016/j.yjmcc.2014.07.020