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Cellular and Molecular Biology Letters

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Volume 12, Issue 1 (Mar 2007)

Ischemic heart failure enhances endogenous myocardial apelin and APJ receptor expression

Pavan Atluri
  • Division of Cardiothoracic Surgery, Department of Surgery, University of Pennsylvania, Silverstein 4, 3400 Spruce St., Philadelphia, PA, 19104, USA
  • Email:
/ Kevin Morine
  • Division of Cardiothoracic Surgery, Department of Surgery, University of Pennsylvania, Silverstein 4, 3400 Spruce St., Philadelphia, PA, 19104, USA
  • Email:
/ George Liao
  • Division of Cardiothoracic Surgery, Department of Surgery, University of Pennsylvania, Silverstein 4, 3400 Spruce St., Philadelphia, PA, 19104, USA
  • Email:
/ Corinna Panlilio
  • Division of Cardiothoracic Surgery, Department of Surgery, University of Pennsylvania, Silverstein 4, 3400 Spruce St., Philadelphia, PA, 19104, USA
  • Email:
/ Mark Berry
  • Division of Cardiothoracic Surgery, Department of Surgery, University of Pennsylvania, Silverstein 4, 3400 Spruce St., Philadelphia, PA, 19104, USA
  • Email:
/ Vivian Hsu
  • Division of Cardiothoracic Surgery, Department of Surgery, University of Pennsylvania, Silverstein 4, 3400 Spruce St., Philadelphia, PA, 19104, USA
  • Email:
/ William Hiesinger
  • Division of Cardiothoracic Surgery, Department of Surgery, University of Pennsylvania, Silverstein 4, 3400 Spruce St., Philadelphia, PA, 19104, USA
  • Email:
/ Jeffrey Cohen
  • Division of Cardiothoracic Surgery, Department of Surgery, University of Pennsylvania, Silverstein 4, 3400 Spruce St., Philadelphia, PA, 19104, USA
  • Email:
/ Y. Joseph Woo
  • Division of Cardiothoracic Surgery, Department of Surgery, University of Pennsylvania, Silverstein 4, 3400 Spruce St., Philadelphia, PA, 19104, USA
  • Email:
Published Online: 2006-11-19 | DOI: https://doi.org/10.2478/s11658-006-0058-7


Apelin interacts with the APJ receptor to enhance inotropy. In heart failure, apelin-APJ coupling may provide a means of enhancing myocardial function. The alterations in apelin and APJ receptor concentrations with ischemic cardiomyopathy are poorly understood. We investigated the compensatory changes in endogenous apelin and APJ levels in the setting of ischemic cardiomyopathy.

Male, Lewis rats underwent LAD ligation and progressed into heart failure over 6 weeks. Corresponding animals underwent sham thoracotomy as control. Six weeks after initial surgery, the animals underwent hemodynamic functional analysis in the presence of exogenous apelin-13 infusion and the hearts were explanted for western blot and enzyme immunoassay analysis.

Western blot analysis of myocardial APJ concentration demonstrated increased APJ receptor protein levels with heart failure (1890750±133500 vs. 901600±143120 intensity units, n=8, p=0.00001). Total apelin protein levels increased with ischemic heart failure as demonstrated by enzyme immunoassay (12.0±4.6 vs. 1.0±1.2 ng/ml, n=5, p=0.006) and western blot (1579400±477733 vs. 943000±157600 intensity units, n=10, p=0.008). Infusion of apelin-13 significantly enhanced myocardial function in sham and failing hearts. We conclude that total myocardial apelin and APJ receptor levels increase in compensation for ischemic cardiomyopathy.

Keywords: Apelin; G protein coupled receptor; APJ; Inotrope

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About the article

Published Online: 2006-11-19

Published in Print: 2007-03-01

Citation Information: Cellular and Molecular Biology Letters, ISSN (Online) 1689-1392, DOI: https://doi.org/10.2478/s11658-006-0058-7. Export Citation

© 2006 University of Wrocław, Poland. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License. (CC BY-NC-ND 3.0)

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