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Ou J, Cui W, Zhao Y, Tang Y, Williams A, Wasalathanthri D, Xu J, Lee J, Borys MC, Khetan A. Use of spectroscopic process analytical technology for rapid quality evaluation during preparation of CHO cell culture media. Biotechnol Prog 2024:e3477. [PMID: 38699906 DOI: 10.1002/btpr.3477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2024] [Revised: 03/27/2024] [Accepted: 04/22/2024] [Indexed: 05/05/2024]
Abstract
Media preparation parameters contribute significantly to media quality, cell culture performance, productivity, and product quality. Establishing proper media preparation procedures is critical for ensuring a robust CHO cell culture process. Process analytical technology (PAT) enables unique ways to quantify assessments and improve media quality. Here, cell culture media were prepared under a wide range of temperatures (40-80°C) and pH (7.6-10.0). Media quality profiles were compared using three real-time PATs: Fourier-transform infrared (FTIR) spectroscopy, Raman spectroscopy, and excitation-emission matrix (EEM) spectroscopy. FTIR and Raman spectroscopies identified shifts in media quality under high preparation temperature (80°C) and at differing preparation pH which negatively impacted monoclonal antibody (mAb) production. In fed-batch processes for production of three different mAbs, viable cell density (VCD) and cell viability were mostly unaffected under all media preparation temperatures, while titer and cell specific productivity of mAb decreased when cultured in basal and feed media prepared at 80°C. High feed preparation pH alone was tolerated but cell growth and productivity profiles deviated from the control condition. Further, charge variants (main, acidic, basic species) and glycosylation (G0F, afucosylation, and high mannose) were examined. Statistically significant differences were observed for one or more of these quality attributes with any shifts in media preparation. In this study, we demonstrated strong associations between media preparation conditions and cell growth, productivity, and product quality. The rapid evaluation of media by PAT implementation enabled more comprehensive understanding of different parameters on media quality and consequential effects on CHO cell culture.
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Affiliation(s)
- Jianfa Ou
- Biologics Development, Global Product Development and Supply, Bristol Myers Squibb, Devens, Massachusetts, USA
| | - Wanyue Cui
- Biologics Development, Global Product Development and Supply, Bristol Myers Squibb, Devens, Massachusetts, USA
| | - Yuxiang Zhao
- Biologics Development, Global Product Development and Supply, Bristol Myers Squibb, Devens, Massachusetts, USA
| | - Yawen Tang
- Biologics Development, Global Product Development and Supply, Bristol Myers Squibb, Devens, Massachusetts, USA
| | - Alexander Williams
- Biologics Development, Global Product Development and Supply, Bristol Myers Squibb, Devens, Massachusetts, USA
| | - Dhanuka Wasalathanthri
- Biologics Development, Global Product Development and Supply, Bristol Myers Squibb, Devens, Massachusetts, USA
| | - Jianlin Xu
- Biologics Development, Global Product Development and Supply, Bristol Myers Squibb, Devens, Massachusetts, USA
| | - Jongchan Lee
- Biologics Development, Global Product Development and Supply, Bristol Myers Squibb, Devens, Massachusetts, USA
| | - Michael C Borys
- Biologics Development, Global Product Development and Supply, Bristol Myers Squibb, Devens, Massachusetts, USA
| | - Anurag Khetan
- Biologics Development, Global Product Development and Supply, Bristol Myers Squibb, Devens, Massachusetts, USA
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Xu J, Santos J, Anderson NS, Borys MC, Pendse G, Li ZJ. Antibody charge variant modulation by in vitro enzymatic treatment in different CHO cell cultures. Biotechnol Prog 2022; 38:e3268. [PMID: 35536540 DOI: 10.1002/btpr.3268] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2021] [Revised: 05/06/2022] [Accepted: 05/07/2022] [Indexed: 11/10/2022]
Abstract
Charge variants represent a critical quality attribute that must be controlled during the development and manufacturing of monoclonal antibodies (mAb). Previously, we reported the development of a cost-effective enzymatic treatment capable of removing the C-terminal lysine from a mAb produced by a Chinese hamster ovary (CHO) GS cell line. This treatment resulted in a significant decrease in basic charge variants and a corresponding improvement in the main peak, enabling a longer cell culture production duration for titer improvement. Here, we describe this enzymatic treatment protocol in detail and demonstrate its applicability to two additional mAbs produced by distinct industrial cell lines. The simple addition of carboxypeptidase B (CpB) at a ratio of 1:10,000 (w/w) to whole cell cultures significantly improved the main peaks for both mAbs without affecting other critical quality attributes, including size exclusion chromatography impurities and N-glycans. Our results demonstrate that this in vitro CpB treatment protocol can be used as a platform strategy to improve main peak for mAbs that exhibit high levels of basic variants attributable to C-terminal lysines. An in vitro enzymatic treatment in general may be another good addition to existing in vivo CHO cell culture strategies for titer improvement and control of critical quality attributes. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Jianlin Xu
- Biologics Development, Global Product Development and Supply, Bristol-Myers Squibb Company, Devens, MA, United States
| | - Johanna Santos
- Biologics Development, Global Product Development and Supply, Bristol-Myers Squibb Company, Devens, MA, United States
| | - Nadine S Anderson
- Biologics Development, Global Product Development and Supply, Bristol-Myers Squibb Company, Devens, MA, United States
| | - Michael C Borys
- Biologics Development, Global Product Development and Supply, Bristol-Myers Squibb Company, Devens, MA, United States
| | - Girish Pendse
- Biologics Development, Global Product Development and Supply, Bristol-Myers Squibb Company, Devens, MA, United States
| | - Zheng Jian Li
- Biologics Development, Global Product Development and Supply, Bristol-Myers Squibb Company, Devens, MA, United States
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Jing S, Shi C, Leong HY, Yuan J, Gao D, Wang H, Yao S, Lin D. A novel twin-column continuous chromatography approach for separation and enrichment of monoclonal antibody charge variants. Eng Life Sci 2021; 21:382-391. [PMID: 34140849 PMCID: PMC8182273 DOI: 10.1002/elsc.202000094] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Revised: 04/13/2021] [Accepted: 04/20/2021] [Indexed: 11/29/2022] Open
Abstract
Downstream processing of mAb charge variants is difficult owing to their similar molecular structures and surface charge properties. This study aimed to apply a novel twin-column continuous chromatography (called N-rich mode) to separate and enrich acidic variants of an IgG1 mAb. Besides, a comparison study with traditional scaled-up batch-mode cation exchange (CEX) chromatography was conducted. For the N-rich process, two 3.93 mL columns were used, and the buffer system, flow rate and elution gradient slope were optimized. The results showed that 1.33 mg acidic variants with nearly 100% purity could be attained after a 22-cycle accumulation. The yield was 86.21% with the productivity of 7.82 mg/L/h. On the other hand, for the batch CEX process, 4.15 mL column was first used to optimize the separation conditions, and then a scaled-up column of 88.20 mL was used to separate 1.19 mg acidic variants with the purity of nearly 100%. The yield was 59.18% with the productivity of 7.78 mg/L/h. By comparing between the N-rich and scaled-up CEX processes, the results indicated that the N-rich method displays a remarkable advantage on the product yield, i.e. 1.46-fold increment without the loss of productivity and purity. Generally, twin-column N-rich continuous chromatography displays a high potential to enrich minor compounds with a higher yield, more flexibility and lower resin cost.
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Affiliation(s)
- Shu‐Ying Jing
- Key Laboratory of Biomass Chemical Engineering of Ministry of EducationCollege of Chemical and Biological EngineeringZhejiang UniversityHangzhouP. R. China
| | - Ce Shi
- Key Laboratory of Biomass Chemical Engineering of Ministry of EducationCollege of Chemical and Biological EngineeringZhejiang UniversityHangzhouP. R. China
| | - Hui Yi Leong
- Key Laboratory of Biomass Chemical Engineering of Ministry of EducationCollege of Chemical and Biological EngineeringZhejiang UniversityHangzhouP. R. China
| | - Jun‐Jie Yuan
- BioRay Pharmaceutical Co., Ltd.TaizhouP. R. China
| | - Dong Gao
- BioRay Pharmaceutical Co., Ltd.TaizhouP. R. China
| | - Hai‐Bin Wang
- BioRay Pharmaceutical Co., Ltd.TaizhouP. R. China
| | - Shan‐Jing Yao
- Key Laboratory of Biomass Chemical Engineering of Ministry of EducationCollege of Chemical and Biological EngineeringZhejiang UniversityHangzhouP. R. China
| | - Dong‐Qiang Lin
- Key Laboratory of Biomass Chemical Engineering of Ministry of EducationCollege of Chemical and Biological EngineeringZhejiang UniversityHangzhouP. R. China
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