人体IgG亚类和全型对补充激活的影响
Timon Damelang1,2,3, Steven W de Taeye1,2, Rosa Rentenaar1
1Department of Immunopathology, Sanquin Research and Landsteiner Laboratory, Amsterdam UMC, University of Amsterdam, Amsterdam, the Netherlands.
Journal of immunology (Baltimore, Md. : 1950)
|October 16, 2023
概括
免疫球蛋白G (IgG) 类型的结构变异显著影响补充激活和补充依赖细胞毒性 (CDC). 特定的IgG2变体和IgG1和IgG3亚类之间的差异影响细胞解质,为治疗抗体设计提供了洞察力.
科学领域:
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
- 生物化学 生化学
背景情况:
- 通过经典途径的补充激活是通过C1结合目标表面的寡合体免疫球蛋白 (Igs) 来启动的.
- 抗体 (Ab) 结构,包括同型,子类和糖化,影响补充系统的激活.
- 多态的IgG变体可以影响Fc-依赖的效应器功能.
研究的目的:
- 评估27种已知具有抗三烯特异性的IgG全型的补充结合,沉积和补充依赖性细胞毒性 (CDC).
- 研究IgG子类内的结构变异对补体激活的影响.
- 阐明抗体介导疾病预防控制中心的上下文依赖性.
主要方法:
- 在27种IgG全型中对补体结合和沉积的评估.
- 使用各种细胞系 (人体红细胞,拉莫斯,拉吉,维恩133) 评估补充依赖细胞毒性 (CDC).
- 在不同的抗原密度下,在补充调节剂的存在/缺席下,IgG1和IgG3亚类的比较.
主要成果:
- 在IgG1,IgG3和IgG4全型之间观察到补体激活的微小差异,IgG2的变化更为显著.
- 与其他IgG2多态相比,等位基变异IGHG2*06显示补体激活和CDC减少.
- 细胞溶解在IgG1和IgG3之间有所不同,IgG3显示红细胞和拉莫斯细胞的优异溶解,而IgG1对Raji和Wien133细胞更有效.
- 抗原密度和抗体链长度,而不是补充调节器,决定了IgG1和IgG3的情境依赖的CDC活性.
结论:
- 单个氨基酸的变化和IgG全型的链长度差异可以改变它们激活补充的能力.
- 这些变异可能为人们对感染性,非免疫性和自身免疫性疾病的易感性提供新的见解.
- 了解这些结构功能关系可以有助于设计改进的基于抗体的治疗方法.
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