期刊
AMERICAN JOURNAL OF PHYSIOLOGY-HEART AND CIRCULATORY PHYSIOLOGY
卷 299, 期 5, 页码 H1515-H1524出版社
AMER PHYSIOLOGICAL SOC
DOI: 10.1152/ajpheart.00585.2010
关键词
oxidative damage; redox balance; antioxidants; heat shock protein
资金
- American Heart Association
- National Institutes of Health [R01HL-067855]
- Research Service of the Department of Veterans Affairs
Kavazis AN, Smuder AJ, Min K, Tumer N, Powers SK. Short-term exercise training protects against doxorubicin-induced cardiac mitochondrial damage independent of HSP72. Am J Physiol Heart Circ Physiol 299: H1515-H1524, 2010. First published September 10, 2010; doi:10.1152/ajpheart.00585.2010.-Doxorubicin (Dox) is an antitumor agent used in cancer treatment, but its clinical use is limited due to cardiotoxicity. Although exercise training can defend against Dox-mediated cardiac damage, the means for this cardioprotection remain unknown. To investigate the mechanism(s) responsible for exercise training-induced cardioprotection against Dox-mediated cardiotoxicity, we tested a two-pronged hypothesis: 1) exercise training protects against Dox-induced cardiotoxicity by preventing Dox-mediated mitochondrial damage/dysfunction and increased oxidative stress and 2) exercise training-induced cardiac expression of the inducible isoform of the 70-kDa heat shock protein 72 (HSP72) is essential to achieve exercise training-induced cardioprotection against Dox toxicity. Animals were randomly assigned to sedentary or exercise groups and paired with either placebo or Dox treatment (i.e., 20 mg/kg body wt ip Dox hydrochloride 24 h before euthanasia). Dox administration resulted in cardiac mitochondrial dysfunction, activation of proteases, and apoptosis. Exercise training increased cardiac antioxidant enzymes and HSP72 protein abundance and protected cardiac myocytes against Dox-induced mitochondrial damage, protease activation, and apoptosis. To determine whether exercise-induced expression of HSP72 in the heart is required for this cardioprotection, we utilized an innovative experimental strategy that successfully prevented exercise-induced increases in myocardial HSP72 levels. However, prevention of exercise-induced increases in myocardial HSP72 did not eliminate the exercise-induced cardioprotective phenotype that is resistant to Dox-mediated injury. Our results indicate that exercise training protects against the detrimental side effects of Dox in cardiac myocytes, in part, by protecting mitochondria against Dox-mediated damage. However, this exercise-induced cardioprotection is independent of myocardial HSP72 levels. Finally, our data are consistent with the concept that increases in cardiac mitochondrial antioxidant enzymes may contribute to exercise-induced cardioprotection.
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