Identification of monoclonal antibody variants involved in aggregate formation – Part 1: Charge variants

生物制药 单克隆抗体 化学 蛋白质稳定性 药品 蛋白质聚集 电荷(物理) 计算生物学 静电 理论(学习稳定性) 产量(工程) 生物物理学 色谱法 抗体 生物化学 生物 遗传学 药理学 材料科学 计算机科学 物理 冶金 机器学习 量子力学
作者
Robina M. Meyer,Lukas Berger,Joerg Nerkamp,Stefan Scheler,Sebastian Nehring,Wolfgang Frieß
出处
期刊:European Journal of Pharmaceutics and Biopharmaceutics [Elsevier BV]
卷期号:158: 123-131 被引量:14
标识
DOI:10.1016/j.ejpb.2020.10.020
摘要

Biopharmaceutical products contain conformational and chemical variants, that are typically well characterized regarding identity and activity. However, little is known about their self-interaction propensity and tendency to unfold, which are critical characteristics for drug stability and safety. This study aimed to separate and compare charge variants of a monoclonal antibody (mAb) and to identify aggregation prone species. We show a semi-preparative cation exchange method, that we developed to separate the individual acidic and basic variants from the naïve mAb. Additionally, we demonstrate, that the yield and purity of the fractionated charge species, extracted by that method, were sufficient for subsequent analysis of aggregate content, conformation stability and self-interaction. Our analysis revealed a differently behaving acidic variant and confirmed its increased aggregation propensity by molecular modeling. During a stability study, the potentially aggregation prone charge variant posed a limited risk to the drug substance (DS). We are the first to look at the stability of single charge variants of biopharmaceuticals, and thus present manufacturers and regulatory authorities with a method to enhance drug safety.
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