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(American Journal of Pathology. 2000;156:1865-1873.)
© 2000 American Society for Investigative Pathology

Regular Articles

Disruption of the Plasminogen Gene in Mice Abolishes Wound Healing after Myocardial Infarction

Esther Creemers*, Jack Cleutjens*, Jos Smits{dagger}, Stephane Heymans{ddagger}, Lieve Moons{ddagger}, Désiré Collen{ddagger}, Mat Daemen* and Peter Carmeliet{ddagger}

From the Departments of Pathology*
and Pharmacology,{dagger}
Cardiovascular Research Institute Maastricht, Universiteit Maastricht, The Netherlands; and the Center for Transgene Technology and Gene Therapy,{ddagger}
Katholieke Universiteit Leuven, Leuven, Belgium

The plasminogen system plays an important role in the proteolytic degradation of extracellular matrices during wound healing. In the present study we investigated the impact of the plasminogen system on cardiac wound healing and function after myocardial infarction. Myocardial infarction was induced in plasminogen-deficient mice (Plg-/-) and in wild-type controls (Plg+/+). Structural analysis 1, 2, and 5 weeks after infarction revealed that infarct healing was virtually abolished in Plg-/- mice, indicating that the plasminogen system is required for the repair process of the heart after infarction. In the absence of plasminogen, inflammatory cells did not migrate into the infarcted myocardium. Necrotic cardiomyocytes were not removed and the formation of granulation tissue and fibrous tissue did not occur. In these non-healing infarcted hearts, LV dilatation was not altered. In addition, gelatinolytic activity of MMP-2 and MMP-9 was depressed in the Plg-/- infarcted hearts, suggesting that the plasmin effect on infarct healing may be mediated by MMPs. Surprisingly, cardiac function was only attenuated to a rather small extent in the Plg-/- infarcted mice when compared to the wild-types. This study provides direct prove that plasmin-mediated proteolysis plays a central role in cardiac wound healing after myocardial infarction in mice.




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