在抗PF4阴性血栓症和血小板活化组合的组合基因组/抗基因组IgG和血小板活化组合和血小板缺血综合征
Max Esefeld1, Stefan Handtke2, Rainer Kaiser3
1Universitätsmedizin Greifswald, Greifswald, Germany.
Blood advances
|April 3, 2025
概括
新的研究发现,在mRNACOVID-19疫苗接种后,一种独特的类型的血栓与血栓细胞衰竭综合征 (TTS) 发生. 这种TTS涉及激素/抗激素IgG复合体激活血小板,不同于以前已知的疫苗诱导的免疫血栓性血栓性缺血症 (VITT).
科学领域:
- 免疫学 免疫学 免疫学
- 血液学 血液学 血液学
- 疫苗学 疫苗学 疫苗学
背景情况:
- 血栓塞栓症候群 (TTS) 伴随的血栓形成是COVID-19疫苗接种后的免疫中介反应.
- 与腺病毒载体疫苗相关的疫苗诱发性免疫血栓性血栓性缺血 (VITT),涉及抗血小板因子4 (PF4) 抗体.
- 在mRNA疫苗接种后,TTS病例的一个子集需要进一步描述.
研究的目的:
- 在用mRNACOVID-19疫苗接种疫苗的患者中调查TTS的临床和血清学特征.
- 确定与mRNA疫苗相关的TTS相关的特定免疫机制和自身抗体.
- 为了探索素/抗素复合体在血小板激活中的作用.
主要方法:
- 对18名接受了mRNA疫苗接种后TTS患者的临床数据的分析.
- 对抗PF4/肝素抗体和其他血小板自身抗体进行血清检测.
- 评估患者血清诱导的血小板激活 (脂胺暴露,CD62P表达)
- 通过IgG和抗激素抗体结合,对基因组沉的研究.
- 活体实验研究,使用基质子/抗基质子IgG复合体和血小板激活试验.
主要成果:
- 18名患者在mRNA COVID-19疫苗接种后出现了TTS症状 (血小板减少,静脉/动脉血栓症).
- 在所有患者中,抗PF4/肝素ELISA检测结果均为阴性.
- 十二种血清诱导了FcγRIIa-依赖的血小板激活.
- 在8/12激活血清和强烈激活血小板中确定了基因组/抗基因组IgG复合体.
- 在 2/114 个健康接种疫苗的人群中,在接种疫苗后开发出抗素抗体.
结论:
- 与mRNACOVID-19疫苗接种相关的TTS的一个新型子实体的特征是血小板激活质/抗质IgG复合体.
- 这种TTS变异与VITT不同,VITT是由抗PF4抗体介导的.
- 需要进一步的研究来阐明疫苗接种后抗原抗体的生物学和临床意义.
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