轻链同型和抗体特异性对病毒中和的影响
Lin Sun1, Roman Palt1, Georg Schütz2
1Department of Biotechnology and Food Sciences, Institute of Plant Biotechnology and Cell Biology, BOKU University, Muthgasse 18, 1190 Vienna, Austria.
Antibodies (Basel, Switzerland)
|June 25, 2025
概括
使用兰巴光链 (λ-Abs) 的治疗抗体不如卡帕光链 (κ-Abs) 常见. 这项研究发现,与lambda变种相比,kappa变种的稳定性略高,对于一个抗体来说,对SARS-CoV-2的活性增加.
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:
- 治疗性抗体是关键的生物药物,但与卡帕轻链抗体 (κ-Abs) 相比,兰巴轻链抗体 (λ-Abs) 代表性不足.
- 了解轻链同型对抗体功能的影响对于优化治疗性抗体开发至关重要.
研究的目的:
- 为了比较SARS-CoV-2特定单克隆抗体 (mAbs) 与kappa (κ) 与lambda (λ) 轻链的表达,糖化,稳定性,抗原结合和功能活性.
- 研究轻链同型对抗体效应器功能的影响,包括中和和免疫复合体的形成.
主要方法:
- 两个SARS-CoV-2 mAbs (P5C3和H4) 的表达,分别具有高和低抗原结合,作为 glycoengineered *Nicotiana benthamiana*.中的 κ 和 λ 变体.
- 对mAbs的表达水平,糖化,热力学稳定性和抗原结合亲和力的表征.
- 评估SARS-CoV-2中和活性和IgG-FcγR免疫复合体的形成对 κ 和 λ 变体.
主要成果:
- 两种mAbs的 κ和 λ变体之间没有观察到表达水平,糖化或抗原结合的显著差异.
- 与兰巴轻链抗体 (λ-Abs) 相比,卡帕轻链抗体 (κ-Abs) 的热力学稳定性略有提高.
- 与其H4 λ对应物相比,H4 κ抗体变异体表现出增强的SARS-CoV-2中和IgG-FcγR免疫复合物的活性,而P5C3变异体显示没有差异.
结论:
- 恒定光链异型影响抗体的稳定性和功能活性,特别是对抗体具有较低抗原结合亲和度的抗体.
- 轻链变异性和抗体特异性都是在设计治疗抗体时需要考虑的关键因素.
- 这些发现强调了在开发新型抗体治疗中评估卡帕和兰巴光链的重要性.
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