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Blood:功能异常的FIX可干扰正常的FIX发挥止血作用

2019-04-18 MedSci MedSci原创

IX因子(FIX)可与内皮细胞下基底膜的胶原IV (Col4)结合。在B型血友病中,FIX-Col4的结合可减少输注的FIX的血浆回收率,在止血过程中具有重要意义。在交联反应阴性(cross-reactive material negative, CRM-)的B型血友病小鼠模型中评估输注的BeneFix(FIXWT)的回收情况的研究表明Col4结合FIX的适合浓度为~405 nM(95% CI 3

IX因子(FIX)可与内皮细胞下基底膜的胶原IV (Col4)结合。在B型血友病中,FIX-Col4的结合可减少输注的FIX的血浆回收率,在止血过程中具有重要意义。

在交联反应阴性(cross-reactive material negative, CRM-)的B型血友病小鼠模型中评估输注的BeneFix(FIXWT)的回收情况的研究表明Col4结合FIX的适合浓度为~405 nM(95% CI 374-436 nM)。因此,与Col4结合的FIX量(血管储存量)是血浆FIX水平的几倍。

预防疗法的小鼠模型(输注150 IU/kg FIX后7天,检测隐静脉出血后的止血情况)中,FIXWT和半衰期延长的FIXs Alprolix(FIXFC)和Idelvion(FIXAIb)在CRM-小鼠中可产生相似的止血效果。

在流血的CRM- B型血友病小鼠中,输注FIX药物后,隐静脉受损部位形成第一个血栓的时间有明显差异:FIXWT &It; FIXFC &It; FIX AIb。但在大部分B型血友病(CRM+)患者的血液循环中都存在功能异常的FIX。在预防疗法的小鼠模型中 ,FIX的所有制剂都不能改善表达功能异常的FIX(FIXR333Q)的CRM+小鼠的止血作用;FIXR333Q可与功能正常的FIX竞争性结合Col4,FIX可能还通过其他通路发挥作用。

总而言之,CRM+ B型血友病小鼠模型提示内源性表达的功能异常的FIX可干扰FIX预防疗法的止血反应。

原始出处:

Brian Cooley, et al.Dysfunctional Endogenous FIX Impairs Prophylaxis in a Mouse Hemophilia B Model.Blood 2019 :blood.2018884015; doi: https://doi.org/10.1182/blood.2018884015 

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    2019-04-20 jeanqiuqiu
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    2019-04-20 fengting8

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