Bovine model of doxorubicin-induced cardiomyopathy.

Academic Article

Abstract

  • Left ventricular assist devices (LVADs) constitute a recent advance in heart failure (HF) therapeutics. As the rigorous experimental assessment of LVADs in HF requires large animal models, our objective was to develop a bovine model of cardiomyopathy. Male calves (n = 8) were used. Four animals received 1.2 mg/kg intravenous doxorubicin weekly for seven weeks and four separate animals were studied as controls. Doxorubicin-treated animals were followed with weekly echocardiography. Target LV dysfunction was defined as an ejection fraction ≤ 35%. Sixty days after initiating doxorubicin, a terminal study was performed to determine hemodynamic, histological, biochemical, and molecular parameters. All four doxorubicin-treated animals exhibited significant (P < 0.05) contractile dysfunction, with target LV dysfunction achieved in three animals. Doxorubicin-treated hearts exhibited significantly reduced coronary blood flow and interstitial fibrosis and significantly increased apoptosis and myocyte size. Gene expression of atrial natriuretic factor increased more than 3-fold. Plasma norepinephrine and epinephrine levels were significantly increased early and late during the development of cardiomyopathy, respectively. We conclude that sequential administration of intravenous doxorubicin in calves induces a cardiomyopathy with many phenotypic hallmarks of the failing human heart. This clinically-relevant model may be useful for testing pathophysiologic responses to LVADs in the context of HF.
  • Keywords

  • Animals, Apoptosis, Cardiomyopathies, Cattle, Coronary Circulation, Disease Models, Animal, Doxorubicin, Epinephrine, Fibrosis, Gene Expression Regulation, Hemodynamics, Male, Myocardium, Myocytes, Cardiac, Norepinephrine, RNA, Messenger, Ultrasonography
  • Digital Object Identifier (doi)

    Author List

  • Bartoli CR; Brittian KR; Giridharan GA; Koenig SC; Hamid T; Prabhu SD
  • Start Page

  • 758736
  • Volume

  • 2011