Upregulation of basement membrane-degrading metalloproteinase secretion after balloon injury of pig carotid arteries

Circulation Research
K M SouthgateA C Newby

Abstract

Basement membrane-degrading metalloproteinases (gelatinases) appear necessary for vascular smooth muscle cell migration and proliferation in culture and for intimal migration of cells after balloon injury to the rat carotid artery. We investigated in the present study the secretion of gelatinases from pig carotid artery tissue after balloon injury. Segments of injured artery and segments proximal and distal to the area of injury were removed 3, 7, and 21 days after balloon dilatation. Medial explants from these segments were then cultured for 3 days, and the serum-free conditioned media were subjected to gelatin zymography. Production of 72- and 95-kD gelatinases was quantified by densitometry. Balloon-injured segments secreted significantly more 72- and 95-kD gelatinase than did paired distal segments at all time points. Release of both gelatinase activities was increased at 3 and 7 days relative to segments from uninjured arteries but declined again by 21 days after balloon injury. Similar results were found for gelatinase levels in extracts of arterial tissue. Consistent with the protein secretion data, in situ hybridization demonstrated that the mRNAs for both gelatinases were upregulated after balloon injury. Expression wa...Continue Reading

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