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Basic Research in Cardiology

, Volume 105, Issue 2, pp 205–218 | Cite as

Anti-inflammatory effect of oxytocin in rat myocardial infarction

  • Marek Jankowski
  • Vickram Bissonauth
  • Lan Gao
  • Marius Gangal
  • Donghao Wang
  • Bogdan Danalache
  • Yang Wang
  • Ekatherina Stoyanova
  • Guy Cloutier
  • Gilbert Blaise
  • Jolanta Gutkowska
Original Contribution

Abstract

While an increasing amount of evidence demonstrates the homeostatic functions of the cardiac oxytocin (OT) system, less is known about the role of this hormone in the injured heart. The current study examined the effect of OT infusion on cell apoptosis, expression of proliferating cell nuclear antigen (PCNA) and inflammation in the acute and subacute phases of myocardial infarction (MI). Prior MI male Sprague-Dawley rats were infused subcutaneously with OT 25 or 125 ng/(kg h) for 3 or 7 days. Saline-treated MI and sham-operated rats served as controls. Echocardiography and analysis of cardiac sections were used to disclose OT actions. Left ventricular fractional shortening, estimated to be 46.0 ± 1.8% in sham controls, declined to 21.1 ± 3.3% in vehicle-treated MI rats and was improved to 34.2 ± 2.1 and to 30.9 ± 2.5% after treatment with OT 25 and 125 ng/(kg h), respectively. OT infusion resulted in: (1) increase of cells expressing PCNA in the infarct zone, diminished cell apoptosis and fibrotic deposits in the remote myocardium; (2) suppression of inflammation by reduction of neutrophils, macrophages and T lymphocytes; (3) depression of the expression of proinflammatory cytokines tumor necrosis factor-alpha and interleukin-6 with promotion of transforming growth factor-beta. OT treatment reduced expression of atrial and brain natriuretic peptides in the infarcted ventricle, as well as the concentration of both peptides in the circulation. These results indicate that continuous OT delivery reduces inflammation and apoptosis in infarcted and remote myocardium, thus improving function in the injured heart.

Keywords

Oxytocin Myocardial infarction Inflammation Apoptosis 

Notes

Acknowledgments

We appreciate the editorial assistance of Ovid da Silva (Research Support Office, CHUM, Hôtel-Dieu Research Center) as well as the secretarial help of Jennifer Lelievre. This work was supported by the Canadian Institutes of Health Research (MOP-53217 to J. G., G. B. and M. J.); and the Canadian Heart and Stroke Foundation (NET SRD-63193 to J. G., G. B. and M. J.).

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Copyright information

© Springer-Verlag 2009

Authors and Affiliations

  • Marek Jankowski
    • 1
  • Vickram Bissonauth
    • 1
  • Lan Gao
    • 1
  • Marius Gangal
    • 1
  • Donghao Wang
    • 1
  • Bogdan Danalache
    • 1
  • Yang Wang
    • 1
  • Ekatherina Stoyanova
    • 1
  • Guy Cloutier
    • 1
  • Gilbert Blaise
    • 1
  • Jolanta Gutkowska
    • 1
  1. 1.Centre de RechercheCentre Hospitalier de l’Université de Montréal (CRCHUM), Hôtel-DieuMontrealCanada

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