Pretreatment Effect of Running Exercise on HSP70 and DOX-Induced Cardiotoxicity

Shirinbayan, Vahid;Roshan, Valiollah Dabidi

  • Published : 2012.11.30


Objective: The purpose of this study was to determine pretreatment effects of moderate-term endurance training before the various dosages (10 and $20{_{}}^{-1}$) of DOX on a heat shock protein ($HSP_{70kda}$) and cardiotoxicity in heart tissue. Methods: Forty-eight male rats were randomly assigned to nontraining (NT) and training (T) groups and three subgroups; $DOX{_{}}^{-1}$ and $DOX{_{}}^{-1}$ and saline treatment. The training program included treadmill running between 25-39 min/day and 15-17 m/min, 5 days/wk for 3 wk. Result: DOX administration, in particularly with $20{_{}}^{-1}$, caused up-regulation of oxidants and cardiac damage (MDA, CK, CPK-MB and CK/CPK-MB) and down-regulation of cardioprotection ($HSP_{70}$, SOD) markers, as compared to NT+saline group. Pretreatment effect of treadmill running endurance exercise in the presence of DOX with $10{_{}}^{-1}$ caused a significant increase in $HSP_{70}$, SOD and a significant decrease in MDA and insignificant decrease in CK, CPK-MB and CK/CPK-MB, in comparison $T+DOX_{10}$ with $NT+DOX_{10}$ group. However, there was no significant difference between $T+DOX{_{}}^{-1}$ and $T+DOX{_{}}^{-1}$ in the aforesaid markers. Conclusion: Dox-induced cardiotoxicity is related to oxidative stress. Our study suggests that pretreatment with endurance exercise may be considered as a potentially useful strategy to improve myocardial tolerance against single dose DOX-induced oxidative damage.


Doxorubicin;cancer;cardiotoxicity;endurance exercise


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