自然获得的功能性抗体对A组Streptococcus的反应在主要菌株类型之间有所不同
Reuben McGregor1,2, Aimee Paterson1, Prachi Sharma1
1School of Medical Science, Faculty of Medical and Health Sciences, The University of Auckland , Auckland, New Zealand.
mSphere
|September 20, 2023
概括
根据菌株类型,A组链球菌 (GAS) 免疫力有所不同,这挑战了M蛋白教条. 静脉注射免疫球蛋白 (IVIG) 揭示M蛋白抗体对某些GAS菌株至关重要,但对其他菌株却不至关重要,影响了人群免疫力.
科学领域:
- 免疫学 免疫学 免疫学
- 微生物学 微生物学
- 疫苗学 疫苗学 疫苗学
背景情况:
- 甲型链球菌 (GAS) 是一个重要的人类病原体,缺乏经许可的疫苗.
- 了解人口对GAS的免疫力至关重要,特别是随着感染率的上升.
- 自然获得的免疫力被认为是M蛋白 (emm型) 特定的,但人们对此了解甚少.
研究的目的:
- 为了研究天然获得的抗体对GAS的反应,使用静脉注射免疫球蛋白 (IVIG) 作为人口免疫的替代品.
- 确定M蛋白特异抗体对不同GAS emm-模式类型的功能杀伤的贡献.
主要方法:
- 使用六种GAS菌株进行了子菌细胞杀死试验,这些菌株代表了三种主要的emm-pattern类型 (A-C,D和E).
- 静脉注射免疫球蛋白 (IVIG),含有来自健康捐赠者的聚合抗体,用于评估功能性抗体反应.
- 进行了特异性测定,以确定M蛋白向抗体对GAS杀伤的贡献.
主要成果:
- 所有测试的GAS菌株的IVIG介导的opsonofagocytic杀死.
- 针对M蛋白的抗体是杀死emm12 (AC模式) 和emm53 (D模式) 菌株的关键.
- 针对M蛋白特异性抗体对杀死emm75 (E型) 菌株没有显著的贡献,这表明了菌株特异性的免疫差异.
结论:
- 自然获得的GAS免疫力在主要的emm-pattern类型之间有很大的差异.
- 对于所有GAS菌株来说,M蛋白不是主要的保护抗原,这挑战了长期以来的科学教条.
- 这些发现对GAS疫苗的研发有影响,这表明需要针对菌株类型特定的抗原标.
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