病原性抗体的结构性表征 疫苗诱导的免疫性血栓性血栓性缺血 (VITT) 的基础
Son N Nguyen1, Si-Hung Le1, Daniil G Ivanov1
1Department of Chemistry, University of Massachusetts-Amherst, Amherst, Massachusetts 01003, United States.
Analytical chemistry
|April 12, 2024
概括
这项研究描述了疫苗诱导的免疫血栓性血栓性缺血症 (VITT) 患者的抗体. 质谱学揭示了一种单克隆抗体上的新型N-糖化位点,为VITT的病原性提供了洞察力.
科学领域:
- 免疫学 免疫学 免疫学
- 质谱测量质量谱测量
- 疫苗学 疫苗学 疫苗学
背景情况:
- 疫苗诱导的免疫血栓性血栓性缺血症 (VITT) 是一种罕见但严重的不良事件,与腺病毒载体COVID-19疫苗有关.
- 在VITT的发病过程中,自身抗体会向血小板因子4 (PF4).
研究的目的:
- 从VITT患者血液中鉴定出抗PF4自身抗体的特征.
- 通过质谱学阐明这些致病性抗体的结构和序列特征.
主要方法:
- 抗体的完整质量测量.抗体的完整质量测量.
- 大型抗体碎片 (光链,Fc/2,Fd) 的中向下质谱.
- 从底部向上的质谱学 (用补充蛋白酶和LC-MS/MS进行片映射).
- 酶去N-糖化加上基映射.
主要成果:
- 很大一部分抗PF4抗体是单克隆的,属于IgG2亚类,具有λ型轻链.
- 在单克隆抗体的VH域的框架3区域中确定了一个新的N-糖化位点,它来自单个生殖基因突变.
- 还检测到较低丰度的多克隆抗体 (所有IgG子类,λ和 κ轻链).
结论:
- 这项研究表明,与VITT相关的致病性抗PF4抗体中存在一种新的N-糖基化位点.
- 结合完整的,中向下的和自下而上的质谱法,对于表征低丰度病原体抗体具有强大作用.
- 结果提供了对VITT的结构基础的见解,并强调了先进的MS技术在临床免疫学中的实用性.
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