净化IgG2二硫化物异型体的pH梯度阴离子交换净化
Mark Chipley1, Kristine Wells1, James L DuMontelle1
1Analytical Research and Development, Biotherapeutics Pharmaceutical Sciences, Pfizer Inc., Chesterfield, MO 63017, USA.
概括
一种新的pH梯度方法净化免疫球蛋白G2 (IgG2) 二硫化异型,揭示它们对治疗抗体功能的影响. 这种技术可以更好地理解和开发基于IgG2的药物.
科学领域:
- 生物化学 生物化学
- 蛋白质化学 蛋白质化学
- 生物制药开发 生物制药开发
背景情况:
- 免疫球蛋白 (IgG) 疗法对于治疗各种疾病至关重要.
- IgG2亚类在其链区域表现出可变的二硫化物键连接性,产生不同的异构体.
- 这些异构体,特别是连锁二硫化物结合变异,可以影响Fab臂结构,并最终影响治疗功效.
研究的目的:
- 开发和演示一种新的净化方法,用于原生IgG2二硫化物异型.
- 分析IgG2单体对治疗性抗体功能的丰度和影响.
- 解决针对特定IgG2单克隆抗体 (mAbs) 的现有净化技术的局限性.
主要方法:
- 开发了一种pH梯度离子交换分离方法,用于原生净化IgG2二硫化物异型体.
- 高分辨率的变质逆相色谱被用于异构体含量分析.
- 收集的分数被组合在一起,以创建具有受控IgG2-B异形百分比的溶液.
主要成果:
- 开发的方法成功地净化了IgG2二硫化物异型,达到以前的盐梯度方法无法达到的mAb.
- 用光检测精确确定异形含量.
- 生成的溶液涵盖了20.3%至80.8%的IgG2-B异型,产品质量和功效测定适用性一致.
结论:
- 一种新的pH梯度阴离子交换方法使IgG2二硫化物异型体的原生分离成为可能.
- 这种方法对IgG2mAbs有效,这些IgG2mAbs对先前的净化技术具有抗性.
- 了解和控制IgG2异型的丰富性对于开发有效的IgG2基疗法至关重要.
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