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Related Experiment Videos

Decrease in sarcoglycans and dystrophin in failing heart following acute myocardial infarction.

Hiroyuki Yoshida1, Masaya Takahashi, Miki Koshimizu

  • 1Department of Pharmacology, Tokyo University of Pharmacy and Life Science, 1432-1 Horinouchi, Hachioji, Tokyo 192-0392, Japan.

Cardiovascular Research
|August 12, 2003
PubMed
Summary

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In chronic heart failure (CHF) from myocardial infarction, sarcoglycans (SGs) and dystrophin (Dys) decrease. Increased calpain activity contributes to this degradation, suggesting a role in heart failure pathophysiology.

Area of Science:

  • Cardiovascular Research
  • Molecular Biology
  • Pathophysiology

Background:

  • Genetic defects in sarcoglycans (SGs) and dystrophin (Dys) are linked to cardiomyopathy.
  • Chronic heart failure (CHF) can arise from acute myocardial infarction (AMI) without genetic defects.

Purpose of the Study:

  • To investigate changes in SGs and Dys in a rat model of CHF induced by AMI.
  • To explore the role of calpain and calpastatin in these molecular changes.

Main Methods:

  • Acute myocardial infarction (AMI) was induced in rats via coronary artery ligation (CAL).
  • Hemodynamic parameters were measured at 2 and 8 weeks post-CAL.
  • Western blotting assessed myocardial levels of SGs, Dys, calpain, and calpastatin.

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Main Results:

  • 8-week CAL rats exhibited increased left ventricular end-diastolic pressure and reduced cardiac output index.
  • Significant decreases in alpha-SG and dystrophin were observed in the viable left and right ventricles of 8-week CAL rats.
  • Myocardial m-calpain levels increased, while calpastatin remained unchanged, suggesting calpain-mediated degradation of SGs and Dys.

Conclusions:

  • Reduced levels of SGs and Dys are implicated in the pathophysiology of CHF following AMI.
  • Calpain activation appears to contribute to the degradation of these proteins in this model.