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DOI: 10.1160/TH07-07-0453
Construction and functional evaluation of hirudin derivatives with low bleeding risk
Financial support: This research is supported by HI-TECH Research and Development Program of China (2007AA02Z158).Publication History
Received: 15 July 2007
Accepted after major revision: 20 January 2007
Publication Date:
24 November 2017 (online)
![](https://www.thieme-connect.de/media/10.1055-s-00035024/200802/lookinside/thumbnails/10-1160-th07-07-0453-1.jpg)
Summary
The purpose of this study was to design and evaluate hirudin (HIR) derivatives with low bleeding risk. In these derivatives, the factor (F) XIa, FXa, and thrombin recognition peptides (EPR, GVYAR, and LGPR, respectively) were linked to the N-terminus of HIR. The intact derivatives have no anticoagulant activity because of the extension of the N-terminus of HIR. After cleavage by the corresponding coagulation factor that occurs on the activation of the coagulation system and in the presence of the thrombus, its activity is released. This limited the anticoagulant activity of these derivatives to the vicinity of the thrombus, and as a result, systemic bleeding complications were avoided. The definite antithrombotic effect and low bleeding parameters of these derivatives were investigated in rat carotid artery and inferior vena cava thrombosis models. In both models, the three derivatives showed significant antithrombotic effects, indicating that anticoagulant activity could be successfully released in vivo. Moreover, the bleeding parameters of these derivatives were lower than that of HIR as indicated by the values of activated partial thromboplastin time (APTT) and thrombin time (TT). To further assess the safety of these derivatives, bleeding time was measured in a mouse tail-cut model. Although the derivatives had obvious effects on bleeding at a dose of 6 mg/kg, the effect of these derivatives on bleeding was significantly weaker than that of HIR at a dose of 1.5 mg/kg. Thus, the benefit-to-risk profiles of the derivatives were superior to that of HIR.
* These authors contribute equally to this work.
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