© 1997 American Heart Association, Inc.
Articles |
Expression of Matrix Metalloproteinases and Their Inhibitor TIMP-1 in the Rat Carotid Artery After Balloon Injury
Correspondence to Karen Webb, PhD, The Centre for Genetics of Cardiovascular Disorders, University College London Medical School, 5 University Street, London WC1E 6JJ, United Kingdom. E mail k.webb@med.ucl.ac.uk
Abstract The temporal relationship of matrix metalloproteinases (MMPs) and a specific tissue inhibitor (TIMP-1) has been examined by reverse transcription-polymerase chain reaction and substrate zymography, after balloon catheter angioplasty of the rat carotid artery. The contralateral uninjured carotid artery was used as a comparative control. Of the MMPs examined, only MMP-2 (72-kDa gelatinase) was produced constitutively by normal uninjured arteries. After injury, MMP-2 mRNA levels fell compared with the uninjured arteries; by 24 hours, levels had increased 2-fold. Zymography showed that the inactive form of MMP-2 predominated in uninjured vessels, but after injury, the level of the active form was increased. MMP-9 (92-kDa gelatinase) mRNA levels and activity peaked at 6 hours after injury and were still detectable at 7 days. MMP-3 (stromelysin) expression was detectable at low levels as early as 2 hours after injury and showed an approximate 2-fold increase of expression at 7 days. The presence of the active protein paralleled the mRNA expression. The inhibitor TIMP-1 mRNA was first detected 6 hours after injury and showed a marked peak of expression at 24 hours; however, no expression was detected by 7 days. The presence of a constitutively expressed, low molecular weight caseinolytic enzyme (27 kDa) was observed, and the induction of a caseinolytic enzyme (30 kDa) was noted that was induced as early as 2 hours after injury, peaked at 6 hours, and was barely detectable by 7 days. These results demonstrate that the process of extracellular matrix breakdown by MMPs after balloon catheter-induced injury is controlled by a tightly regulated temporal response by the genes responsible for the production of these enzymes and their inhibitor and by post-translational activation of the proenzymes.
Key Words: matrix metalloproteinases • RT-PCR • rat • carotid artery • injury
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