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Decreased sensitivity of neonatal rabbit sarcoplasmic reticulum to anthracycline cardiotoxicity

Brian E Burke1, Phillip S Mushlin, Barry J Cusack

  • 1Medical Research Service, Department of Veterans Affairs Medical Center, Boise, ID 83702, USA. drq10@iglide.net

Cardiovascular Toxicology
|August 22, 2002
PubMed

Insights

Pediatric patients show increased sensitivity to anthracycline cardiotoxicity. This study found neonatal rabbit hearts resistant to anthracyclines, suggesting different mechanisms of cardiac damage in developing versus adult hearts.

Area of Science:

  • Cardiovascular Pharmacology
  • Pediatric Oncology
  • Molecular Cardiology

Background:

  • Anthracyclines are vital chemotherapy drugs, but their use is limited by cardiotoxicity.
  • Pediatric patients exhibit heightened sensitivity to anthracycline-induced cardiotoxicity, with underlying mechanisms remaining unclear.
  • The sarcoplasmic reticulum (SR) is implicated in adult anthracycline cardiotoxicity, but its role in developing myocardium is unexamined.

Purpose of the Study:

  • To investigate the acute effects of anthracyclines on cardiac contractility in adult and neonatal rabbit models.
  • To compare the impact of anthracyclines on sarcoplasmic reticulum (SR) function in developing versus mature myocardium.
  • To elucidate potential differences in mechanisms of cardiotoxicity between pediatric and adult populations.

Main Methods:

  • Compared acute effects of doxorubicin, daunorubicin, and caffeine on contractile function in adult and neonatal rabbit myocardium.
  • Assessed concentration-dependent inhibition of frequency-dependent contractility, relaxation times, and post-rest potentiation.
  • Evaluated the role of sarcoplasmic reticulum (SR) calcium stores and function.

Main Results:

  • Adult myocardium showed concentration-dependent inhibition of contractile function and impaired SR function with anthracyclines and caffeine.
  • Neonatal myocardium demonstrated resistance to the acute cardiotoxic effects of anthracyclines and caffeine.
  • Contractile dysfunction correlated with differences in SR maturation between adult and neonatal hearts.

Conclusions:

  • Anthracyclines induce acute cardiac lesions in adults via effects on the sarcoplasmic reticulum (SR).
  • Developing myocardium appears resistant to anthracycline-induced SR dysfunction, suggesting alternative mechanisms for cardiotoxicity.
  • Findings highlight potential age-dependent differences in anthracycline cardiotoxicity mechanisms, crucial for pediatric treatment strategies.

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