Ir-CPI, a coagulation contact phase inhibitor from the tick Ixodes ricinus, inhibits thrombus formation without impairing hemostasis.

Ir-CPI, a coagulation contact phase inhibitor from the tick Ixodes ricinus, inhibits thrombus formation without impairing hemostasis.
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Ir-CPI 是一种来自蓖麻蜱的凝血接触相抑制剂,可抑制血栓形成而不损害止血。

DOI:
10.1084/jem.20091007
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发表时间:
2009-10-26
期刊:
The Journal of experimental medicine
影响因子:
--
通讯作者:
Godfroid E
Godfroid E
中科院分区:
其他
文献类型:
--
作者:
Decrem Y;Rath G;Blasioli V;Cauchie P;Robert S;Beaufays J;Frère JM;Feron O;Dogné JM;Dessy C;Vanhamme L;Godfroid E

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血管内皮损伤后血液立即开始凝固。该系统对于最大限度地减少受损血管的失血至关重要,但也会导致血管血栓形成。尽管长期以来人们一直认为内在凝血途径对于体内凝血并不重要,但最近从基因改造小鼠中获得的数据表明接触相蛋白似乎对于血栓形成至关重要。我们发现,重组蓖麻硬蜱接触相抑制剂(Ir-CPI)是由蓖麻硬蜱唾液腺表达的库尼兹型蛋白,在体外与激活的人类接触相因子(FXIIa、FXIa和激肽释放酶)特异性相互作用,并延长激活的部分凝血活酶时间(aPTT)。还使用静脉和动脉血栓形成模型在体内检查了 Ir-CPI 的影响。大鼠和小鼠静脉注射 Ir-CPI 会引起静脉血栓形成的剂量依赖性减少,并揭示动脉闭塞血栓形成的缺陷。此外,注射 Ir-CPI 的小鼠可以免受胶原蛋白和肾上腺素诱导的血栓栓塞。值得注意的是,有效抗血栓剂量的 Ir-CPI 不会促进出血或损害凝血参数。总之,我们的结果表明接触相抑制剂是一种有效且安全的体内抗血栓剂。
Blood coagulation starts immediately after damage to the vascular endothelium. This system is essential for minimizing blood loss from an injured blood vessel but also contributes to vascular thrombosis. Although it has long been thought that the intrinsic coagulation pathway is not important for clotting in vivo, recent data obtained with genetically altered mice indicate that contact phase proteins seem to be essential for thrombus formation. We show that recombinant Ixodes ricinus contact phase inhibitor (Ir-CPI), a Kunitz-type protein expressed by the salivary glands of the tick Ixodes ricinus, specifically interacts with activated human contact phase factors (FXIIa, FXIa, and kallikrein) and prolongs the activated partial thromboplastin time (aPTT) in vitro. The effects of Ir-CPI were also examined in vivo using both venous and arterial thrombosis models. Intravenous administration of Ir-CPI in rats and mice caused a dose-dependent reduction in venous thrombus formation and revealed a defect in the formation of arterial occlusive thrombi. Moreover, mice injected with Ir-CPI are protected against collagen- and epinephrine-induced thromboembolism. Remarkably, the effective antithrombotic dose of Ir-CPI did not promote bleeding or impair blood coagulation parameters. To conclude, our results show that a contact phase inhibitor is an effective and safe antithrombotic agent in vivo.
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