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Related Experiment Video

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A Doxorubicin-induced Cardiomyopathy Model in Adult Zebrafish
08:09

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Published on: June 7, 2018

Exercise preconditioning protects against doxorubicin-induced cardiac dysfunction.

David S Hydock1, Chia-Ying Lien, Carole M Schneider

  • 1School of Sport and Exercise Science, University of Northern Colorado, Greeley, CO 80639, USA.

Medicine and Science in Sports and Exercise
|April 15, 2008
PubMed
Summary

Endurance exercise training before doxorubicin (DOX) treatment protects against heart damage for up to 10 days. This cardioprotection is linked to maintaining myosin heavy chain (MHC) isoform balance.

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Area of Science:

  • Cardiology
  • Exercise Physiology
  • Pharmacology

Background:

  • Doxorubicin (DOX) chemotherapy causes dose-dependent cardiotoxicity, limiting its clinical use.
  • Exercise is increasingly recognized for its protective effects against DOX-induced cardiac dysfunction.
  • Endurance training may offer a defense mechanism against DOX cardiotoxicity.

Purpose of the Study:

  • To investigate the cardioprotective effects of exercise preconditioning against acute doxorubicin (DOX)-induced cardiotoxicity.
  • To determine if myosin heavy chain (MHC) isoform alterations mediate exercise-induced cardioprotection.

Main Methods:

  • Male Sprague-Dawley rats underwent 10 weeks of treadmill training, voluntary running, or sedentary conditions.
  • Animals received saline or 10 mg/kg doxorubicin (DOX) injection.
  • Cardiac function was assessed using echocardiography and isolated working heart preparations at 5 and 10 days post-injection.
  • Left ventricular MHC isoform expression was analyzed.

Main Results:

  • DOX induced significant cardiac dysfunction in sedentary rats at 5 and 10 days post-injection.
  • This DOX-induced dysfunction correlated with an upregulation of the beta-MHC isoform.
  • Exercise preconditioning attenuated DOX-induced cardiac dysfunction and beta-MHC upregulation.

Conclusions:

  • Endurance training provides significant protection against acute doxorubicin (DOX) cardiotoxicity for up to 10 days.
  • This protective effect is associated with the preservation of myosin heavy chain (MHC) isoform distribution.