IgG1与IgG3:抗体特异性和全型变异对病毒中和有效性的影响
Somanath Kallolimath1, Lin Sun1, Roman Palt1
1Institute of Plant Biotechnology and Cell Biology, Department of Applied Genetics and Cell Biology, BOKU University, Vienna, Austria.
Frontiers in immunology
|November 8, 2024
概括
我们设计了IgG3抗体,以提高治疗潜力,克服表达和半衰期的挑战. 一种特定的变种显示出增强的SARS-CoV-2中和和病毒抑制,提供了一个有前途的新疗法策略.
科学领域:
- 生物技术是生物技术.
- 免疫学 免疫学 免疫学
- 分子生物学分子生物学
背景情况:
- 免疫球蛋白G子类3 (IgG3) 提供了独特的优势,如增强的效应器功能和抗原结合灵活性.
- 治疗IgG3的应用受到重组表达困难和短血半衰期的限制.
- 基于植物的表达系统为生产治疗性抗体提供了一个新的平台.
研究的目的:
- 设计和生产IgG3格式的SARS-CoV-2中和单克隆抗体 (mAbs),具有改进的生产和药理动力学 (PK) 特性.
- 评估全型变异对植物表达的IgG3抗体功能的影响.
- 为了比较工程IgG3变体及其IgG1对应物的疗效.
主要方法:
- 两个SARS-CoV-2中和的mAbs (P5C3和H4) 被转换为IgG3的子类,并被设计成全型变异 (-WT, -H, -KVH).
- 在糖基工程植物中产生了抗体,合成了同质的,无糖的N-甘氨酸.
- 进行了结合试验 (抗原,FcγR,补充) 和功能试验 (中和,抗体依赖细胞介导病毒抑制 - ADCVI).
主要成果:
- 在工厂中成功生产了八种不同的mAbs.
- 所有工程化IgG3变体都显示了可比抗原,FcγR,并与对照组结合.
- 与其他H4变体相比,H4 IgG3 H变体表现出优越的SARS-CoV-2中和和ADCVI强度.
结论:
- 基因工程IgG3抗体的植物性生产是可行的,产生具有增强稳定性和与IgG1.1相似的PK配置文件的变体.
- H4 IgG3 H 变体表现出强大的抗病毒活性,表明其作为治疗候选者的潜力.
- 抗体特异性和全型变异都对优化治疗抗体功能至关重要.
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