探索IgG1-scFv双特异抗体的分子决定因素和药物动力学特性
Kristina M J Aertker1, Minu Ravindra Pilvankar2, Tobias M Prass3
1Analytical Development Biologicals, Boehringer Ingelheim Pharma GmbH & Co. KG, Biberach an der Riss, Germany.
mAbs
|March 6, 2024
概括
具有不利的药理动力学 (PK) 的双特异性抗体 (BsAbs) 由于非特异性相互作用和独特的FcRn结合,显示出快速清除. 了解这些分子因素是开发有效BsAb疗法的关键.
科学领域:
- 生物制药开发 生物制药开发
- 免疫学 免疫学 免疫学
- 蛋白质工程是指蛋白质工程.
背景情况:
- 双特异性抗体 (BsAbs) 通过向多种疾病途径,提供治疗潜力.
- 类似于单克隆抗体 (mAbs) 的有利的药理动力学 (PK) 特性对于BsAb的安全性和有效性至关重要.
- 许多BsAbs表现出不利的PK,阻碍了它们的临床发展.
研究的目的:
- 调查负责三个IgG1-单链可变片段 (scFv) BsAbs.bs的独特PK配置文件的分子决定因素.
- 确定导致某些BsAbs.观察到的快速清除的因素.
- 探索新生儿Fc受体 (FcRn) 相互作用的作用和BsAb PK中的in silico特性.
主要方法:
- 三种IgG1-scFv BsAbs的表征,具有不同的PK配置文件.
- 用FcRn染色学来评估FcRn相互作用.
- 分子动力学 (MD) 模拟来分析分子相互作用.
- 评估在中的特性,如同电点 (pI) 和二极矩与疏水矩 (RM) 的比率.
主要成果:
- 高的非特异性相互作用,升高的PI和增加的正电荷补丁与快速的BsAb清除相关.
- 在IgG1-scFv BsAbs中发现了独特的scFv-FcRn相互作用,与典型的mAb相互作用不同.
- 这些独特的相互作用可能会在生理pH下破坏FcRn介导的循环.
- 在的特性,包括PI差异和RM比率,与观察到的清除率有相关性.
结论:
- BsAbs的PK可以受到独特的分子决定因素的影响,这些因素超出了影响传统mAbs的因素.
- BsAbs的结构复杂性引入了管理其清除和FcRn相互作用的新因素.
- 结果为优化BsAb设计提供了洞察力,以实现治疗应用的有利PK配置文件.
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