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Am J Physiol Heart Circ Physiol (May 29, 2003). doi:10.1152/ajpheart.00207.2003
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Submitted on March 13, 2003
Accepted on May 21, 2003

Targeted Deletion of Matrix Metalloproteinase-2 Attenuates Early Left Ventricular Rupture and Late Remodeling After Experimental Myocardial Infarction

Shunji Hayashidani1, Hiroyuki Tsutsui1*, Masaki Ikeuchi1, Tetsuya Shiomi1, Hidenori Matsusaka1, Toru Kubota1, Kyoko Imanaka-Yoshida2, Takeshi Itoh3, and Akira Takeshita1

1 Department of Cardiovascular Medicine, Kyushu University, Fukuoka, Japan
2 Department of Pathology, Mie University, Tsu, Japan
3 Discovery Research Laboratories, Shionogi and Co., Ltd, Osaka, Japan

* To whom correspondence should be addressed. E-mail: prehiro{at}cardiol.med.kyushu-u.ac.jp.

Matrix metalloproteinase-2 (MMP-2) is prominently overexpressed both after myocardial infarction (MI) and in heart failure. However, its pathophysiological significance in these conditions is still unclear. We thus examined the effects of targeted deletion of MMP-2 on post-MI left ventricular (LV) remodeling and failure. Anterior MI was produced in 10-12 week-old male MMP-2 knockout (KO) and sibling wild-type (WT) mice by ligating the left coronary artery. By day 28, MI resulted in a significant increase in mortality in association with LV cavity dilatation and dysfunction. The MMP-2 KO mice had a significantly better survival rate than WT mice (56% vs 85%, P<0.05), despite a comparable infarct size (50±3% vs 51±3%, P=NS), heart rate, and arterial blood pressure. The KO mice had a significantly lower incidence of LV rupture (10% vs 39%, P<0.05), which occurred within 7 days of MI. The KO mice exerted less LV cavity dilatation and an improved fractional shortening after MI by echocardiography. The LV zymographic MMP-2 level significantly increased in the WT mice after a coronary artery ligation, however, this was completely prevented in KO mice. In contrast, the increase in LV zymographic MMP-9 level after MI was similar between KO and WT. MMP-2 activation is therefore considered to contribute to an early cardiac rupture as well as late LV remodeling after MI. The inhibition of MMP-2 activation may therefore be a potentially useful therapeutic strategy to manage post-MI hearts.




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