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Rheumatic Heart Disease I: Introduction01:23

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Rheumatic heart disease or RHD is a chronic condition that results from rheumatic fever, causing permanent damage to the heart valves.Etiology and Risk FactorsIt primarily arises from rheumatic fever, an inflammatory disease that can develop after untreated or inadequately treated group A streptococcal (GAS) pharyngitis. Streptococcus spreads through direct contact with oral or respiratory secretions. While the bacteria are the causative agents, factors like malnutrition, overcrowding, poor...

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Runx1 in Postn-Expressing Fibroblasts But Not Cardiomyocytes Exacerbates Adverse Cardiac Remodeling Post-Myocardial

Kaelin A Akins1, Anooj Arkatkar1, Michael A Flinn2

  • 1Department of Cell Biology, Neurobiology, and Anatomy, Medical College of Wisconsin, Milwaukee, Wisconsin, USA.

JACC. Basic to Translational Science
|January 14, 2026
PubMed
Summary

Runx1 is induced in the heart after injury, worsening outcomes. Inhibiting Runx1 in fibroblasts, but not cardiomyocytes, protects the heart from adverse remodeling following myocardial infarction.

Keywords:
Runx1adverse remodelingcardiomyocytefibroblastfibrosismyocardial infarction

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Area of Science:

  • Cardiovascular biology
  • Molecular cardiology
  • Cardiac remodeling

Background:

  • Runx1 expression is upregulated in the heart following acute injury and in chronic disease.
  • High Runx1 expression correlates with poor cardiac outcomes.
  • Previous studies indicate that Runx1 inhibition confers a protective effect.

Purpose of the Study:

  • To identify the specific cell types responsible for adverse cardiac remodeling due to Runx1 induction.
  • To investigate the role of Runx1 in cardiomyocytes versus fibroblasts in the context of heart injury.

Main Methods:

  • Utilized distinct Cre driver lines to specifically ablate Runx1 in cardiomyocytes and fibroblasts.
  • Induced experimental myocardial infarction to model heart injury.
  • Assessed the impact of Runx1 ablation in different cell types on cardiac remodeling.

Main Results:

  • Loss of Runx1 in fibroblasts significantly protected the heart from adverse remodeling post-myocardial infarction.
  • Ablation of Runx1 in cardiomyocytes did not confer similar protective effects.
  • This suggests fibroblasts are key mediators of Runx1-driven adverse cardiac remodeling.

Conclusions:

  • Fibroblast-specific Runx1 is a critical driver of adverse cardiac remodeling after myocardial infarction.
  • Targeting Runx1 in fibroblasts may represent a novel therapeutic strategy for heart disease.
  • Runx1's role in cardiac pathophysiology is cell-type dependent.