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疫苗诱导的免疫血栓性血栓性缺血中的抗体表位
Angela Huynh1, John G Kelton1,2, Donald M Arnold1,2
1Department of Medicine, Michael G. DeGroote School of Medicine, McMaster University, Hamilton, Ontario, Canada.
Nature
|July 7, 2021
概括
疫苗诱导的免疫血栓性血栓缺血 (VITT) 涉及针对肝素结合部位的血小板因子4 (PF4) 的抗体. 这些抗体激活血小板,导致类似于肝素诱导的血小板缩 (HIT) 的血栓形成.
科学领域:
- 免疫学
- 血液学
- 疫苗学
背景情况:
- 疫苗诱发的免疫血栓性血栓缺血 (VITT) 是一种罕见但严重的与COVID-19腺病毒载体疫苗相关的不良反应.
- VITT与氨酸诱导的血小板缩 (HIT) 有相似之处,涉及对血小板激活因子4 (PF4) 的抗体,但没有氨酸暴露.
研究的目的:
- 为了确定PF4的VITT患者的抗体的特定结合部位.
- 将VITT相关抗体的结合特性与HIT中发现的抗体进行比较.
主要方法:
- 使用氨酸扫描突变生成来绘制PF4的抗体结合部位.
- 使用生物层干扰测量来评估抗体与PF4和PF4- 肝素复合物的结合亲和力和动力学.
主要成果:
- 来自VITT患者的抗体 (n=5) 完全与PF4的肝素结合部位中的八种氨基酸结合,这种结合被肝素抑制.
- 来自HIT患者的抗体 (n=10) 结合到PF4上不同的部位.
- 与HIT抗体相比,VITT抗PF4抗体对PF4和PF4- 肝素复合物的结合反应更强.
结论:
- VITT抗体结合到PF4上模仿肝素的部位,促进四聚体聚合和免疫复合体的形成.
- 这种结合导致FcγRIIa依赖的血小板激活,解释了VITT诱导的血栓形成机制.
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