Thromb Haemost 1999; 81(04): 601-604
DOI: 10.1055/s-0037-1614532
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Schattauer GmbH

Differential Role of Components of the Fibrinolytic System in the Formation and Removal of Thrombus Induced by Endothelial Injury

Hiroyuki Matsuno
1   From the Department of Pharmacology, Gifu University School of Medicine, Gifu, Japan
2   Department of Physiology, Kinki University School of Medicine, Osakasayama City, Japan
,
Osamu Kozawa
1   From the Department of Pharmacology, Gifu University School of Medicine, Gifu, Japan
,
Masayuki Niwa
1   From the Department of Pharmacology, Gifu University School of Medicine, Gifu, Japan
,
Shigeru Ueshima
2   Department of Physiology, Kinki University School of Medicine, Osakasayama City, Japan
,
Osamu Matsuo
2   Department of Physiology, Kinki University School of Medicine, Osakasayama City, Japan
,
Désiré Collen
3   Center for Transgene Technology and Gene Therapy, Flanders Interuniversity Institute for Biotechnology, Leuven, Belgium
,
Toshihiko Uematsu
1   From the Department of Pharmacology, Gifu University School of Medicine, Gifu, Japan
› Author Affiliations
Further Information

Publication History

Received 14 August 1998

Accepted after resubmission 16 December 1998

Publication Date:
09 December 2017 (online)

Summary

The role of fibrinolytic system components in thrombus formation and removal in vivo was investigated in groups of six mice deficient in urokinase-type plasminogen activator (u-PA), tissue-type plasminogen activator (t-PA), or plasminogen activator inhibitor-1 (PAI-1) (u-PA-/-, t-PA-/- or PAI-1-/-, respectively) or of their wild type controls (u-PA+/+, t-PA+/+ or PAI-1+/+). Thrombus was induced in the murine carotid artery by endothelial injury using the photochemical reaction between rose bengal and green light (540 nm). Blood flow was continuously monitored for 90 min on day 0 and for 20 min on days 1, 2 and 3. The times to occlusion after the initiation of endothelial injury in u-PA+/+, t-PA+/+ or PAI-1+/+ mice were 9.4 ± 1.3, 9.8 ± 1.1 or 9.7 ± 1.6 min, respectively. u-PA-/- and t-PA-/- mice were indistinguishable from controls, whereas that of PAI-1-/- mice were significantly prolonged (18.4 ± 3.7 min). Occlusion persisted for the initial 90 min observation period in 10 of 18 wild type mice and was followed by cyclic reflow and reocclusion in the remaining 8 mice. At day 1, persistent occlusion was observed in 1 wild type mouse, 8 mice had cyclic reflow and reocclusion and 9 mice had persistent reflow. At day 2, all injured arteries had persistent reflow. Persistent occlusion for 90 min on day 0 was observed in 3 u-PA-/-, in all t-PA-/- mice at day 1 and in 2 of the t-PA-/-mice at day 2 (p <0.01 versus wild type mice). Persistent patency was observed in all PAI-1-/- mice at day 1 and in 5 of the 6 u-PA-/- mice at day 2 (both p <0.05 versus wild type mice). In conclusion, t-PA increases the rate of clot lysis after endothelial injury, PAI-1 reduces the time to occlusion and delays clot lysis, whereas u-PA has little effect on thrombus formation and spontaneous lysis.

 
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