Blood:FVIII-纳米抗体融合蛋白与VWF形成稳定的相互作用,可延长FVIII的作用时间、减弱FVIII的免疫反应

2018-08-02 MedSci MedSci原创

中心点:VIII因子与抗VWF纳米抗体融合可增强VWF的亲和力,高达25倍,而且不影响FVIII活性。稳定的VWF结合可使FVIII的循环存活率提高达2倍,并可减少抗FVIII抗体的产生。摘要:血管性血友病因子(VWF)调节VIII因子(FVIIII)的清除和抗FVIII免疫反应。虽然FVIII/VWF相互作用具有高亲和力,但结合和解离动力学显示有2-5%的FVIII处于游离状态。为了避免在体内研

中心点:

VIII因子与抗VWF纳米抗体融合可增强VWF的亲和力,高达25倍,而且不影响FVIII活性。

稳定的VWF结合可使FVIII的循环存活率提高达2倍,并可减少抗FVIII抗体的产生。

摘要:

血管性血友病因子(VWF)调节VIII因子(FVIIII)的清除和抗FVIII免疫反应。虽然FVIII/VWF相互作用具有高亲和力,但结合和解离动力学显示有2-5%的FVIII处于游离状态。为了避免在体内研究FVIII-VWF复合物时受到游离FVIII的干扰,Vincent Muczynski等人设计了FVIII-纳米抗体融合蛋白,纳米部分可靶向VWF。该融合蛋白,被命名为FVIII-KB012bv,与B-domainless FVIII(BDD-FVIII)相比,其与VWF的亲和力增加25倍。

体外分析显示单期凝血和显色法均存在全辅助因子活性(活性/抗原比分别是1.0±0.3和1.1±0.3)。在体内,与BDD-FVIII相比,FVIII-013bv的平均滞留时间延长2倍(3.0h vs 1.6h)。尾部钳夹出血实验显示,输注FVIII后24小时内,输注FVIII-013bv的小鼠明显比输注BDD-FVIII的小鼠失血量减少(15±7ul vs 194±146ul;p=0.0043)。

此外,研究人员在检测FVIII缺陷型小鼠的抗FVIII抗体形成时,意外发现针对FVIII-013bv的免疫应答反应明显较针对BDD-FVIII的反应弱(予以FVIII-013bv或BDD-FVIII治疗后分别有1/8和14/16的小鼠体内产生抗FVIII抗体)。

本研究表明FVIII可与VWF建立稳定的相互作用,进而延长FVIII的存活期,并可减轻针对FVIII的免疫反应。

原始出处:

Vincent Muczynski, et al. A factor VIII-nanobody fusion protein forming an ultra-stable complex with VWF: effect on clearance & antibody formation. Blood  2018  :blood-2018-01-829523;  doi: https://doi.org/10.1182/blood-2018-01-829523

本文系梅斯医学(MedSci)原创编译,转载需授权!

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    2019-03-24 juliusluan78
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    2019-04-24 wjcjjian
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    2018-08-04 sunmin0219
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    2018-08-04 ylz8405
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    2018-08-04 licz0427