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(Circulation. 2002;105:753.)
© 2002 American Heart Association, Inc.
Basic Science Reports |
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 Womens Hospital, Harvard Medical School, Boston, Mass; and Pfizer Central Research (L.L.-M., J.C., S.B., P.G.M.), Groton, Conn.
Correspondence to Richard T. Lee, MD, Cardiovascular Division, Partners Research Facility, Room 279, 65 Landsdowne St, Cambridge, MA 02139. 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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