链设计的IgG1-IgG3杂交子类IgGh47有力地增强了Fc介导的抗链球菌和SARS-CoV-2抗体的功能
Arman Izadi1, Yasaman Karami2,3, Eleni Bratanis1
1Department of Clinical Sciences Lund, Infection Medicine, Faculty of Medicine, Lund University, Lund, Sweden.
Nature communications
|April 27, 2024
概括
工程抗体链提高了细菌清除和防治Streptococcus pyogenes的保护. 这种链工程抗体,IgGh47,显示出作为对侵入性细菌感染的治疗候选人的希望.
科学领域:
- 免疫学 免疫学 免疫学
- 传染性疾病 传染性疾病
- 蛋白质工程是指蛋白质工程.
背景情况:
- 斯氏菌 (Streptococcus pyogenes) 导致严重的侵袭性疾病,死亡率高,即使使用抗生素治疗.
- 一个现有的声IgG1单克隆抗体 (Ab25) 针对S. pyogenes的M蛋白.
- 工程抗体子类 (IgG2-4) 被探索以提高治疗疗效.
研究的目的:
- 为了设计抗M蛋白抗体Ab25的IgG2-4亚类.
- 调查链区域修改对抗体功能的影响,特别是细胞化和opsonization.
- 评估针对S. pyogenes和SARS-CoV-2的工程抗体的治疗潜力.
主要方法:
- Ab25的IgG2-4亚类的生成和表征.
- 原子模拟来分析Fc尾部动力学和链区域的灵活性.
- 通过结合IgG3-hinge段 (IgGhxx) 来进行IgG1的架工程.
- 试验室的细胞测定和S. pyogenes感染的体内小鼠模型.
- 测试针对各种S. pyogenes菌株和抗SARS-CoV-2抗体的工程抗体.
主要成果:
- 尽管结合率降低,但Ab25的IgG3版本增强了细菌细胞化.
- 原子模拟显示,IgG3的Fc尾部由于其延长的链而发生了广泛的Fc尾部运动.
- 杆工程IgG1 (IgGh47) 在不减少结合的情况下增强了声功能.
- 在小鼠模型中,IgGh47证明了对S. pyogenes的改善保护.
- 在各种S. pyogenes菌株和抗SARS-CoV-2抗体中验证了IgGh47增强的声功能.
结论:
- 抗体的架工程可以显著提高opsonic功能和治疗疗效.
- IgGh47亚类代表了侵入性S. pyogenes感染的前临床治疗候选人.
- 观察到的抗体功能的改善可以在不同的病原体和抗体标中推广.
- 这项研究为抗体结构-功能关系和抗体工程策略提供了新的见解.
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