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on December 31, 2001

Circulation. 2001
Published online before print December 31, 2001, doi: 10.1161/hc0602.103674
A more recent version of this article appeared on February 12, 2002
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Submitted on September 18, 2001
Revised on November 29, 2001
Accepted on December 14, 2001

Selective Matrix Metalloproteinase Inhibition Reduces Left Ventricular Remodeling but Does Not Inhibit Angiogenesis After Myocardial Infarction

Merry L. Lindsey PhD, Joseph Gannon , Masanori Aikawa MD, PhD, Frederick J. Schoen MD, PhD, Elena Rabkin MD, PhD, Lori Lopresti-Morrow BS, Jamie Crawford , Shawn Black PhD, Peter Libby MD, Peter G. Mitchell MD, and Richard T. Lee MD*

From the Leducq Center for Cardiovascular Research (M.L.L., J.G., M.A., P.L., R.T.L.), Cardiovascular Division, Department of Medicine, and the Department of Pathology (F.J.S., E.R.), Brigham and Women's Hospital, Harvard Medical School, Boston, Mass; and Pfizer Central Research (L.L.-M., J.C., S.B., P.G.M.), Groton, Conn.

* To whom correspondence should be addressed. E-mail: rlee{at}rics.bwh.harvard.edu.

Background—Broad inhibition of matrix metalloproteinases (MMPs) attenuates left ventricular remodeling after myocardial infarction (MI). However, it is not clear if selective MMP inhibition strategies will be effective or if MMP inhibition will impair angiogenesis after MI.

Methods and Results—We used a selective MMP inhibitor (MMPi) that does not inhibit MMP-1 in rabbits, which, like humans but unlike rodents, express MMP-1 as a major collagenase. On day 1 after MI, rabbits were randomized to receive either inhibitor (n=10) or vehicle (n=8). At 4 weeks after MI, there were no differences in infarct size or collagen fractional area. However, MMPi reduced ventricular dilation. The increase in end-diastolic dimension from day 1 to week 4 was 3.1±0.5 mm for vehicle versus 1.3±0.3 mm for MMPi (P<0.01). The increase in end-systolic dimension was 2.8±0.5 mm for vehicle and 1.3±0.4 mm for MMPi (P<0.05). Furthermore, MMPi reduced infarct wall thinning; the minimal infarct thickness was 0.8±0.1 mm for vehicle and 1.6±0.3 mm for MMPi (P<0.05). Interestingly, the MMPi group had increased numbers of vessels in the subendocardial layer of the infarct; the number of capillaries was increased in the subendocardial layer (46±4 vessels/field versus 17±3 vessels/field for vehicle; P<0.001), and the number of arterioles was also increased (4.0±0.8 vessels/field versus 2.0±0.4 vessels/field for vehicle; P<0.05).

Conclusions—MMP inhibition attenuates left ventricular remodeling even when the dominant collagenase MMP-1 is not inhibited; furthermore, this selective MMP inhibition appears to increase rather than decrease neovascularization in the subendocardium.


Key words: ventricles • myocardial infarction • metalloproteinases • remodeling




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