Regulation of arterial thrombolysis by plasminogen activator inhibitor-1 in mice

Circulation
P M FarrehiWilliam P Fay

Abstract

Platelet-rich arterial thrombi are resistant to lysis by plasminogen activators. However, the mechanisms underlying thrombolysis resistance are poorly defined. Plasminogen activator inhibitor-1 (PAI-1), which is present in plasma, platelets, and vascular endothelium, may be an important determinant of the resistance of arterial thrombi to lysis. However, in vitro studies examining the regulation of platelet-rich clot lysis by PAI-1 have yielded inconsistent results. We developed a murine arterial injury model and applied it to wild-type (PAI-1 [+/+]) and PAI-1-deficient (PAI-1 [-/-]) animals. FeCl3 was used to induce carotid artery thrombosis. Thrombi consisted predominantly of dense platelet aggregates, consistent with the histology of thrombi in large-animal arterial injury models and human acute coronary syndromes. To examine the role of PAI-1 in regulating endogenous clearance of platelet-rich arterial thrombi, thrombi were induced in 22 PAI-1 (+/+) mice 14 PAI-1 (-/-) mice. Twenty-four hours later, the amount of residual thrombus was determined by histological analysis of multiple transverse sections of each artery. Residual thrombus was detected in 55 of 85 sections (64.7%) obtained from PAI-1 (+/+) mice compared with 19 ...Continue Reading

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