Inhibition of matrix metalloproteinase activity inhibits smooth muscle cell migration but not neointimal thickening after arterial injury

Circulation Research
M P BendeckM A Reidy

Abstract

Smooth muscle cell (SMC) migration and replication are important for neointimal formation after arterial injury. Migration of SMCs requires degradation of basement membrane and extracellular matrix surrounding the cell, and our previous work has shown a correlation between expression of two matrix-degrading metalloproteinases (MMPs), MMP-2 and MMP-9, and smooth muscle migration into the intima in the balloon catheter-injured rat carotid artery. In the present study, an MMP inhibitor, GM 6001, was administered to rats for various times after balloon injury of the carotid artery. Inhibition of MMP activity resulted in a 97% decrease in the number of SMCs that migrated into the intima by 4 days after injury, and lesions growth was retarded by continuous treatment with GM 6001-treated rats was 0.035 +/- 0.008 mm2 compared with 0.095 +/- mm2 in the control group. Neither intimal nor medical SMC replication rates were decreased by GM 6001 treatment, supporting our hypothesis that the decrease in lesion size was due to inhibition of MMP-mediated migration and not inhibition of replication. By 14 days after injury, however, intimal area and SMC number were the same control and inhibitor-treated rats. An increased rate of SMC replicatio...Continue Reading

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