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Polymer-mediated Flocculation of Transient CHO Cultures as a Simple, High Throughput Method to Facilitate Antibody Discovery

机译:聚合物介导的瞬态CHO培养物的絮凝作为一种简单,高通量的方法,以促进抗体发现

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摘要

Most biopharmaceutical drugs, especially monoclonal antibodies (mAbs), bispecific antibodies (BsAbs) and Fc-fusion proteins, are expressed using Chinese Hamster Ovary (CHO) cell lines. CHO cells typically yield high product titers and high product quality. Unfortunately, CHO cell lines also generate high molecular weight (HMW) aggregates of the desired product during cell culture along with CHO host cell protein (HCP) and CHO DNA. These immunogenic species, co-purified during Protein A purification, must be removed in a multi-step purification process. Our colleagues have reported the use of a novel polymer-mediated flocculation step to simultaneously reduce HMW, HCP and DNA from stable CHO cell cultures prior to Protein A purification. The objective of this study was to evaluate this novel "smart polymer" (SmP) in a high throughput antibody discovery workflow using transiently transfected CHO cultures. SmP treatment of 19 different molecules from four distinct molecular categories (human mAbs, murine mAbs, BsAbs and Fabs) with 0.1% SmP and 25 mM stimulus resulted in minimal loss of monomeric protein. Treatment with SmP also demonstrated a variable, concentration-dependent removal of HMW aggregates after Protein A purification. SmP treatment also effectively reduced HCP levels at each step of mAb purification with final HCP levels being several fold lower than the untreated control. Interestingly, SmP treatment was able to significantly reduce high concentrations of artificially spiked levels of endotoxin in the cultures. In summary, adding a simple flocculation step to our existing transient CHO process reduced the downstream purification burden to remove impurities and improved final product quality. (C) 2017 American Institute of Chemical Engineers
机译:使用中国仓鼠卵巢(CHO)细胞系表达大多数生物植物药物,尤其是单克隆抗体(MAB),双特异性抗体(BSAB)和FC融合蛋白。 CHO细胞通常产生高产品滴度和高产品质量。遗憾的是,CHO细胞系还在细胞培养期间产生高分子量(HMW)所需产物的聚集,以及CHO宿主细胞蛋白(HCP)和CHO DNA。这些免疫原性在蛋白质纯化期间共纯化,必须在多步纯化过程中除去。我们的同事们报道了使用新的聚合物介导的絮凝步骤,同时在蛋白质纯化之前同时从稳定的CHO细胞培养物中减少HMW,HCP和DNA。本研究的目的是利用瞬时转染的CHO培养,在高通量抗体发现工作流程中评估这种新的“智能聚合物”(SMP)。 SMP处理来自四种不同分子类别(人mAb,鼠mAb,Bsabs和Fab)的不同分子,其中0.1%SMP和25mM刺激导致单体蛋白质的损失最小。用SMP处理还证明了蛋白质纯化后的可变,浓度依赖性除去HMW聚集体。 SMP治疗还有效地降低了MAB纯化的每个步骤中的HCP水平,最终HCP水平比未处理的对照低几个折叠。有趣的是,SMP治疗能够显着降低培养物中的高浓度的人工掺入毒素。总之,向我们现有的瞬态CHO过程中增加了简单的絮凝步骤,降低了下游净化负担,以消除杂质和改善的最终产品质量。 (c)2017美国化学工程师研究所

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  • 来源
    《Biotechnology Progress》 |2017年第5期|共8页
  • 作者单位

    Eli Lilly &

    Co Lilly Res Labs Biotechnol Discovery Res Indianapolis IN 46285 USA;

    Eli Lilly &

    Co Lilly Res Labs Biotechnol Discovery Res Indianapolis IN 46285 USA;

    Eli Lilly &

    Co Lilly Res Labs Biotechnol Discovery Res Indianapolis IN 46285 USA;

    Eli Lilly &

    Co Lilly Res Labs Biotechnol Discovery Res Indianapolis IN 46285 USA;

    Eli Lilly &

    Co Lilly Res Labs Biotechnol Discovery Res Indianapolis IN 46285 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 生物科学;
  • 关键词

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