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Inhibition of cardiac myocyte apoptosis improves cardiac function and abolishes mortality in the peripartum cardiomyopathy of Galpha(q) transgenic mice

  • 0Program in Molecular Cardiology, Department of Medicine, Albert Einstein College of Medicine, Bronx, NY 10461, USA.
Circulation +

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November 26, 2003

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November 26, 2003

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Summary

This summary is machine-generated.

Inhibiting cardiac myocyte apoptosis via caspase inhibition significantly improved heart function and survival in a mouse model of peripartum cardiomyopathy. These findings suggest that targeting apoptosis could be a novel therapeutic strategy for heart failure.

Area Of Science

  • Cardiology
  • Molecular Biology
  • Pathophysiology

Background

  • Cardiac myocyte apoptosis is observed in heart failure, but its pathogenic role remains unclear.
  • Transgenic mice overexpressing Galpha(q) develop lethal peripartum cardiomyopathy with significant apoptosis.
  • This study investigates if inhibiting apoptosis can ameliorate cardiac dysfunction and improve survival in this model.

Purpose Of The Study

  • To determine the causal role of cardiac myocyte apoptosis in Galpha(q)-induced peripartum cardiomyopathy.
  • To evaluate the efficacy of caspase inhibition in improving cardiac function and survival.

Main Methods

  • Administration of a potent polycaspase inhibitor (IDN-1965) or vehicle via osmotic minipump to Galpha(q) mice during pregnancy.
  • Assessment of cardiac caspase-3-like activity and myocyte apoptosis frequency.
  • Evaluation of left ventricular function (dimensions, fractional shortening, dP/dt) and survival rates.

Main Results

  • IDN-1965 significantly suppressed cardiac caspase activity and reduced myocyte apoptosis.
  • Caspase inhibition led to marked improvements in left ventricular dimensions and function (fractional shortening, dP/dt).
  • Treatment with IDN-1965 completely prevented mortality in the Galpha(q) mice.

Conclusions

  • Reducing cardiac myocyte apoptosis through caspase inhibition improves cardiac function and survival in a model of peripartum cardiomyopathy.
  • These results establish a causal link between cardiac myocyte apoptosis and cardiomyopathy pathogenesis in this model.
  • Caspase inhibition emerges as a potential novel therapeutic target for heart failure treatment.

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