MCIP1 overexpression suppresses left ventricular remodeling and sustains cardiac function after myocardial infarction

Eva van Rooij, Pieter A. Doevendans, Harry J G M Crijns, Sylvia Heeneman, Daniel J. Lips, Marc van Bilsen, R. Sanders Williams, Eric N. Olson, Rhonda Bassel-Duby, Beverly A. Rothermel, Leon J. De Windt

Research output: Contribution to journalArticlepeer-review

100 Scopus citations

Abstract

Pathological remodeling of the left ventricle (LV) after myocardial infarction (MI) is a major cause of heart failure. Although cardiac hypertrophy after increased loading conditions has been recognized as a clinical risk factor for human heart failure, it is unknown whether post-MI hypertrophic remodeling of the myocardium is beneficial for cardiac function over time, nor which regulatory pathways play a crucial role in this process. To address these questions, transgenic (TG) mice engineered to overexpress modulatory calcineurin-interacting protein-1 (MCIP1) in the myocardium were used to achieve cardiac-specific inhibition of calcineurin activation. MCIP1-TG mice and their wild-type (WT) littermates, were subjected to MI and analyzed 4 weeks later. At 4 weeks after MI, calcineurin was activated in the LV of WT mice, which was significantly reduced in MCIP1-TG mice. WT mice displayed a 78% increase in LV mass after MI, which was reduced by 38% in MCIP1-TG mice. Echocardiography indicated marked LV dilation and loss of systolic function in WT-MI mice, whereas TG-MI mice displayed a remarkable preservation of LV geometry and contractility, a pronounced reduction in myofiber hypertrophy, collagen deposition, and β-MHC expression compared with WT-MI mice. Together, these results reveal a protective role for MCIP1 in the post-MI heart and suggest that calcineurin is a crucial regulator of postinfarction-induced pathological LV remodeling. The improvement in functional, structural, and molecular abnormalities in MCIP1-TG mice challenges the adaptive value of post-MI hypertrophy of the remote myocardium. The full text of this article is available online at http://circres.ahajournals.org.

Original languageEnglish (US)
Pages (from-to)e18-e26
JournalCirculation research
Volume94
Issue number3
DOIs
StatePublished - Feb 20 2004

Keywords

  • Calcineurin
  • Heart failure
  • Hypertrophy
  • Myocardial infarction
  • Signaling

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine

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