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Characterization of operating parameters for XMuLV inactivation by low pH treatment

机译:低pH处理Xmulv失活的操作参数的表征

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To ensure the viral safety of protein therapeutics made in mammalian cells, purification processes include dedicated viral clearance steps to remove or inactivate adventitious and endogenous viruses. One such dedicated step is low pH treatment, a robust and effective method commonly used in monoclonal antibody production to inactivate enveloped viruses. To characterize the operating space for low pH viral inactivation, we performed a statistically designed experiment evaluating the effect of pH, temperature, hold duration, acid type, and buffer concentration on inactivation of the retrovirus model, XMuLV. An additional single factor experiment was performed to study the effect of protein concentration. These data were used to generate predictive models of inactivation at each time point studied, which can be used to identify conditions for robust and effective XMuLV inactivation. At pH 3.6, XMuLV inactivation was rapid, robust, and relatively unaffected by the other factors studied, providing support for this as a generic viral inactivation condition for products that can tolerate this low pH. At pH 3.7 and 3.8, other factors besides pH affected XMuLV inactivation. By understanding the impact of each factor on inactivation, the factors can be manipulated within the operating space to ensure effective inactivation while achieving desired product quality goals. (c) 2015 American Institute of Chemical Engineers Biotechnol. Prog., 32:89-97, 2016
机译:为确保哺乳动物细胞中蛋白质治疗剂的病毒安全性,纯化方法包括专用的病毒清除步骤,以除去或灭活不征区和内源性病毒。一种这样的专用步骤是低pH处理,一种常用于单克隆抗体产生的稳健且有效的方法,以灭活包膜病毒。为了表征低pH病毒失活的操作空间,我们进行了统计设计的实验,评估了pH,温度,保持持续时间,酸类型和缓冲浓度对逆转录病毒模型的失活的影响,Xmulv。进行另外的单因素实验以研究蛋白质浓度的影响。这些数据用于在所研究的每个时间点产生预测的失活模型,其可用于识别鲁棒性和有效的Xmulv失活的条件。在pH 3.6,Xmulv失活迅速,稳健,并且由所研究的其他因素相对不受影响,为此提供支持,作为能够耐受该低pH的产品的通用病毒灭活条件。在pH 3.7和3.8,除了pH受影响外,其他因素影响Xmulv灭活。通过了解每个因素对失活的影响,可以在操作空间内操纵因素,以确保有效的灭活,同时实现所需的产品质量目标。 (c)2015美国化学工程研究所生物科技。 Prog。,32:89-97,2016

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