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Exercise and Cardiovascular Response01:20

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A Doxorubicin-Induced Murine Model of Dilated Cardiomyopathy In Vivo
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Doxorubicin-induced vascular dysfunction and its attenuation by exercise preconditioning.

Noah M Gibson1, Stephanie E Greufe, David S Hydock

  • 1School of Sport and Exercise Science and the Rocky Mountain Cancer Rehabilitation Institute, University of Northern Colorado, Greeley, CO.

Journal of Cardiovascular Pharmacology
|May 31, 2013
PubMed
Summary

Regular exercise training can protect against the vascular damage caused by the chemotherapy drug doxorubicin (DOX). Exercise improves vascular smooth muscle function, independent of DOX accumulation in tissues.

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Area of Science:

  • Cardiovascular Pharmacology
  • Exercise Physiology
  • Cancer Therapeutics

Background:

  • Doxorubicin (DOX) is a vital chemotherapy agent, but its use is limited by dose-dependent cardiovascular toxicity.
  • While exercise training shows promise in mitigating DOX-induced cardiotoxicity, its effects on vascular dysfunction remain unclear.

Purpose of the Study:

  • To investigate if chronic exercise training protects against doxorubicin-induced vascular dysfunction.
  • To determine if exercise-mediated changes in vascular function correlate with doxorubicin accumulation in vascular tissue.

Main Methods:

  • Male Sprague-Dawley rats underwent 14 weeks of sedentary (SED) or voluntary wheel running (WR) exercise.
  • Animals received either 15 mg/kg doxorubicin (DOX) or saline.
  • Aortic function and DOX accumulation were assessed 24 hours post-injection.

Main Results:

  • Exercise-trained rats (WR + DOX) exhibited significantly greater aortic contraction force compared to sedentary rats (SED + DOX).
  • Endothelium-independent relaxation was improved in WR + DOX animals versus SED + DOX.
  • No significant differences in endothelium-dependent function or aortic DOX accumulation were observed between groups.

Conclusions:

  • Chronic exercise training attenuates doxorubicin-induced vascular smooth muscle dysfunction.
  • The protective effects of exercise appear independent of doxorubicin accumulation within the vascular tissue.