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• W2017657602 abstract "Tissue plasminogen activator (t-PA) causes fibrinogen proteolysis when alpha 2-antiplasmin levels fall, and this may contribute to t-PA-induced hemorrhage. Because clot-bound plasmin is protected from alpha 2-antiplasmin inhibition, we tested the possibility that alpha 2-antiplasmin supplementation would block t-PA-induced fibrinogenolysis and bleeding without affecting thrombolysis. When added to human or rabbit plasma, alpha 2-antiplasmin inhibits t-PA-induced fibrinogenolysis, but hat little effect on the lysis of 125I-fibrin clots. To examine its effect in vivo, rabbits with preformed 125I-labeled-jugular vein thrombi were randomized to receive t-PA, t-PA and alpha 2-antiplasmin, or saline. alpha 2-Antiplasmin infusion produced a modest decrease in t-PA-induced thrombolysis (from 40.2% to 30.1%, P = 0.12), but reduced fibrinogen consumption from 87% to 27% (P = 0.0001), and decreased blood loss from standardized ear incisions from 5,594 to 656 microliter (P < 0.0001). We hypothesize that alpha 2-antiplasmin limits t-PA-induced hemorrhage by inhibiting fibrinogenolysis and subsequent fragment X formation because (a) SDS-PAGE and immunoblot analysis indicate less fragment X formation in alpha 2-antiplasmin treated animals, and (b) when added to a solution of fibrinogen and plasminogen clotted with thrombin in the presence of t-PA, fragment X shortens the lysis time in a concentration-dependent fashion. These findings suggest that fragment X incorporation into hemostatic plugs contributes to t-PA-induced bleeding. By blocking t-PA-mediated fibrinogenolysis, alpha 2-antiplasmin supplementation may improve the safety of fibrin-specific plasminogen activators." @default.
• W2017657602 created "2016-06-24" @default.
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• W2017657602 date "1993-04-01" @default.
• W2017657602 modified "2023-10-13" @default.
• W2017657602 title "Alpha 2-antiplasmin supplementation inhibits tissue plasminogen activator-induced fibrinogenolysis and bleeding with little effect on thrombolysis." @default.
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• W2017657602 doi "https://doi.org/10.1172/jci116335" @default.
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