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Canova CT, Inguva PK, Braatz RD. Mechanistic modeling of viral particle production. Biotechnol Bioeng 2023; 120:629-641. [PMID: 36461898 DOI: 10.1002/bit.28296] [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: 09/18/2022] [Revised: 11/29/2022] [Accepted: 11/30/2022] [Indexed: 12/05/2022]
Abstract
Viral systems such as wild-type viruses, viral vectors, and virus-like particles are essential components of modern biotechnology and medicine. Despite their importance, the commercial-scale production of viral systems remains highly inefficient for multiple reasons. Computational strategies are a promising avenue for improving process development, optimization, and control, but require a mathematical description of the system. This article reviews mechanistic modeling strategies for the production of viral particles, both at the cellular and bioreactor scales. In many cases, techniques and models from adjacent fields such as epidemiology and wild-type viral infection kinetics can be adapted to construct a suitable process model. These process models can then be employed for various purposes such as in-silico testing of novel process operating strategies and/or advanced process control.
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Affiliation(s)
- Christopher T Canova
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Pavan K Inguva
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Richard D Braatz
- Department of Chemical Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
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2
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Szkodny AC, Lee KH. Biopharmaceutical Manufacturing: Historical Perspectives and Future Directions. Annu Rev Chem Biomol Eng 2022; 13:141-165. [PMID: 35300518 DOI: 10.1146/annurev-chembioeng-092220-125832] [Citation(s) in RCA: 15] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
This review describes key milestones related to the production of biopharmaceuticals-therapies manufactured using recombinant DNA technology. The market for biopharmaceuticals has grown significantly since the first biopharmaceutical approval in 1982, and the scientific maturity of the technologies used in their manufacturing processes has grown concomitantly. Early processes relied on established unit operations, with research focused on process scale-up and improved culture productivity. In the early 2000s, changes in regulatory frameworks and the introduction of Quality by Design emphasized the importance of developing manufacturing processes to deliver a desired product quality profile. As a result, companies adopted platform processes and focused on understanding the dynamic interplay between product quality and processing conditions. The consistent and reproducible manufacturing processes of today's biopharmaceutical industry have set high standards for product efficacy, quality, and safety, and as the industry continues to evolve in the coming decade, intensified processing capabilities for an expanded range of therapeutic modalities will likely become routine. Expected final online publication date for the Annual Review of Chemical and Biomolecular Engineering, Volume 13 is October 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.
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Affiliation(s)
- Alana C Szkodny
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, USA; ;
| | - Kelvin H Lee
- Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, Delaware 19716, USA; ;
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Kyriakopoulos S, Ang KS, Lakshmanan M, Huang Z, Yoon S, Gunawan R, Lee DY. Kinetic Modeling of Mammalian Cell Culture Bioprocessing: The Quest to Advance Biomanufacturing. Biotechnol J 2017; 13:e1700229. [DOI: 10.1002/biot.201700229] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2017] [Revised: 09/27/2017] [Accepted: 10/11/2017] [Indexed: 12/15/2022]
Affiliation(s)
- Sarantos Kyriakopoulos
- Bioprocessing Technology Institute, Agency for Science; Technology and Research (A*STAR); Singapore
| | - Kok Siong Ang
- Bioprocessing Technology Institute, Agency for Science; Technology and Research (A*STAR); Singapore
| | - Meiyappan Lakshmanan
- Bioprocessing Technology Institute, Agency for Science; Technology and Research (A*STAR); Singapore
| | - Zhuangrong Huang
- Department of Chemical Engineering; University of Massachusetts Lowell; Lowell MA USA
| | - Seongkyu Yoon
- Department of Chemical Engineering; University of Massachusetts Lowell; Lowell MA USA
| | - Rudiyanto Gunawan
- Institute for Chemical and Bioengineering; ETH Zurich; Zurich Switzerland
| | - Dong-Yup Lee
- Bioprocessing Technology Institute, Agency for Science; Technology and Research (A*STAR); Singapore
- Department of Chemical and Biomolecular Engineering; National University of Singapore; Singapore
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5
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Sou SN, Jedrzejewski PM, Lee K, Sellick C, Polizzi KM, Kontoravdi C. Model-based investigation of intracellular processes determining antibody Fc-glycosylation under mild hypothermia. Biotechnol Bioeng 2017; 114:1570-1582. [PMID: 27869292 PMCID: PMC5485029 DOI: 10.1002/bit.26225] [Citation(s) in RCA: 31] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Revised: 09/23/2016] [Accepted: 11/14/2016] [Indexed: 02/03/2023]
Abstract
Despite the positive effects of mild hypothermic conditions on monoclonal antibody (mAb) productivity (qmAb) during mammalian cell culture, the impact of reduced culture temperature on mAb Fc‐glycosylation and the mechanism behind changes in the glycan composition are not fully established. The lack of knowledge about the regulation of dynamic intracellular processes under mild hypothermia restricts bioprocess optimization. To address this issue, a mathematical model that quantitatively describes Chinese hamster ovary (CHO) cell behavior and metabolism, mAb synthesis and mAb N‐linked glycosylation profile before and after the induction of mild hypothermia is constructed. Results from this study show that the model is capable of representing experimental results well in all of the aspects mentioned above, including the N‐linked glycosylation profile of mAb produced under mild hypothermia. Most importantly, comparison between model simulation results for different culture temperatures suggests the reduced rates of nucleotide sugar donor production and galactosyltransferase (GalT) expression to be critical contributing factors that determine the variation in Fc‐glycan profiles between physiological and mild hypothermic conditions in stable CHO transfectants. This is then confirmed using experimental measurements of GalT expression levels, thereby closing the loop between the experimental and the computational system. The identification of bottlenecks within CHO cell metabolism under mild hypothermic conditions will aid bioprocess optimization, for example, by tailoring feeding strategies to improve NSD production, or manipulating the expression of specific glycosyltransferases through cell line engineering. Biotechnol. Bioeng. 2017;114: 1570–1582. © 2016 The Authors. Biotechnology and Bioengineering Published by Wiley Periodicals Inc.
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Affiliation(s)
- Si Nga Sou
- Department of Life Sciences, Imperial College London, London, United Kingdom.,Centre for Synthetic Biology and Innovation, Imperial College London, London, United Kingdom.,Department of Chemical Engineering, Centre for Process Systems Engineering, Imperial College London, London SW7 2AZ, United Kingdom
| | - Philip M Jedrzejewski
- Department of Chemical Engineering, Centre for Process Systems Engineering, Imperial College London, London SW7 2AZ, United Kingdom
| | - Ken Lee
- Cell Culture and Fermentation Sciences, MedImmune, Granta Park, Cambridge, United Kingdom
| | - Christopher Sellick
- Cell Culture and Fermentation Sciences, MedImmune, Granta Park, Cambridge, United Kingdom
| | - Karen M Polizzi
- Department of Life Sciences, Imperial College London, London, United Kingdom.,Centre for Synthetic Biology and Innovation, Imperial College London, London, United Kingdom
| | - Cleo Kontoravdi
- Department of Chemical Engineering, Centre for Process Systems Engineering, Imperial College London, London SW7 2AZ, United Kingdom
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6
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Harreither E, Hackl M, Pichler J, Shridhar S, Auer N, Łabaj PP, Scheideler M, Karbiener M, Grillari J, Kreil DP, Borth N. Microarray profiling of preselected CHO host cell subclones identifies gene expression patterns associated with increased production capacity. Biotechnol J 2015; 10:1625-38. [PMID: 26315449 DOI: 10.1002/biot.201400857] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2014] [Revised: 06/22/2015] [Accepted: 08/21/2015] [Indexed: 01/02/2023]
Abstract
Over the last three decades, product yields from CHO cells have increased dramatically, yet specific productivity (qP) remains a limiting factor. In a previous study, using repeated cell-sorting, we have established different host cell subclones that show superior transient qP over their respective parental cell lines (CHO-K1, CHO-S). The transcriptome of the resulting six cell lines in different biological states (untransfected, mock transfected, plasmid transfected) was first explored by hierarchical clustering and indicated that gene activity associated with increased qP did not stem from a certain cellular state but seemed to be inherent for a high qP host line. We then performed a novel gene regression analysis identifying drivers for an increase in qP. Genes significantly implicated were first systematically tested for enrichment of GO terms using a Bayesian approach incorporating the hierarchical structure of the GO term tree. Results indicated that specific cellular components such as nucleus, ER, and Golgi are relevant for cellular productivity. This was complemented by targeted GSA that tested functionally homogeneous, manually curated subsets of KEGG pathways known to be involved in transcription, translation, and protein processing. Significantly implicated pathways included mRNA surveillance, proteasome, protein processing in the ER and SNARE interactions in vesicular transport.
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Affiliation(s)
- Eva Harreither
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Matthias Hackl
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Johannes Pichler
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Smriti Shridhar
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
| | | | - Paweł P Łabaj
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Marcel Scheideler
- RNA Biology Group, Institute for Genomics and Bioinformatics, Graz University of Technology, Graz, Austria
| | - Michael Karbiener
- RNA Biology Group, Institute for Genomics and Bioinformatics, Graz University of Technology, Graz, Austria
| | - Johannes Grillari
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - David P Kreil
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Nicole Borth
- Department of Biotechnology, University of Natural Resources and Life Sciences, Vienna, Austria. .,ACIB GmbH, Graz, Austria.
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Klein T, Niklas J, Heinzle E. Engineering the supply chain for protein production/secretion in yeasts and mammalian cells. J Ind Microbiol Biotechnol 2015; 42:453-64. [PMID: 25561318 DOI: 10.1007/s10295-014-1569-2] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2014] [Accepted: 12/16/2014] [Indexed: 12/14/2022]
Abstract
Metabolic bottlenecks play an increasing role in yeasts and mammalian cells applied for high-performance production of proteins, particularly of pharmaceutical ones that require complex posttranslational modifications. We review the present status and developments focusing on the rational metabolic engineering of such cells to optimize the supply chain for building blocks and energy. Methods comprise selection of beneficial genetic modifications, rational design of media and feeding strategies. Design of better producer cells based on whole genome-wide metabolic network analysis becomes increasingly possible. High-resolution methods of metabolic flux analysis for the complex networks in these compartmented cells are increasingly available. We discuss phenomena that are common to both types of organisms but also those that are different with respect to the supply chain for the production and secretion of pharmaceutical proteins.
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Affiliation(s)
- Tobias Klein
- Research Area Biochemical Engineering, Institute of Chemical Engineering, Vienna University of Technology, Gumpendorfer Strasse 1a, 1060, Vienna, Austria
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8
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Vishwanathan N, Le H, Jacob NM, Tsao YS, Ng SW, Loo B, Liu Z, Kantardjieff A, Hu WS. Transcriptome dynamics of transgene amplification in Chinese hamster ovary cells. Biotechnol Bioeng 2013; 111:518-28. [DOI: 10.1002/bit.25117] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2013] [Revised: 08/16/2013] [Accepted: 09/09/2013] [Indexed: 12/14/2022]
Affiliation(s)
- Nandita Vishwanathan
- Department of Chemical Engineering and Materials Science; University of Minnesota; 421 Washington Avenue S.E. Minneapolis Minnesota 55455-0132
| | - Huong Le
- Department of Chemical Engineering and Materials Science; University of Minnesota; 421 Washington Avenue S.E. Minneapolis Minnesota 55455-0132
| | - Nitya M. Jacob
- Department of Chemical Engineering and Materials Science; University of Minnesota; 421 Washington Avenue S.E. Minneapolis Minnesota 55455-0132
| | | | - Sze-Wai Ng
- Bioprocessing Technology Institute; Singapore Singapore
| | - Bernard Loo
- Bioprocessing Technology Institute; Singapore Singapore
| | - Zhong Liu
- Bioprocess Development; Merck & Co.; Union New Jersey
| | - Anne Kantardjieff
- Department of Chemical Engineering and Materials Science; University of Minnesota; 421 Washington Avenue S.E. Minneapolis Minnesota 55455-0132
| | - Wei-Shou Hu
- Department of Chemical Engineering and Materials Science; University of Minnesota; 421 Washington Avenue S.E. Minneapolis Minnesota 55455-0132
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9
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Bhoskar P, Belongia B, Smith R, Yoon S, Carter T, Xu J. Free light chain content in culture media reflects recombinant monoclonal antibody productivity and quality. Biotechnol Prog 2013; 29:1131-9. [DOI: 10.1002/btpr.1767] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2012] [Revised: 04/29/2013] [Indexed: 11/07/2022]
Affiliation(s)
- Prachi Bhoskar
- Dept. of Chemistry; University of Massachusetts Lowell; Lowell MA
| | - Brett Belongia
- Bioreactor Process Development; EMD Millipore; Bedford MA
| | - Robert Smith
- Process Analytical Technologies; EMD Millipore; Bedford MA
| | - Seongkyu Yoon
- Dept. of Chemical Engineering; University of Massachusetts Lowell; Lowell MA
| | - Tyler Carter
- Dept. of Chemistry; University of Massachusetts Lowell; Lowell MA
| | - Jin Xu
- Dept. of Chemistry; University of Massachusetts Lowell; Lowell MA
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10
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Harraghy N, Buceta M, Regamey A, Girod PA, Mermod N. Using matrix attachment regions to improve recombinant protein production. Methods Mol Biol 2012; 801:93-110. [PMID: 21987249 DOI: 10.1007/978-1-61779-352-3_7] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Chinese hamster ovary (CHO) cells are the system of choice for the production of complex molecules, such as monoclonal antibodies. Despite significant progress in improving the yield from these cells, the process to the selection, identification, and maintenance of high-producing cell lines remains cumbersome, time consuming, and often of uncertain outcome. Matrix attachment regions (MARs) are DNA sequences that help generate and maintain an open chromatin domain that is favourable to transcription and may also facilitate the integration of several copies of the transgene. By incorporating MARs into expression vectors, an increase in the proportion of high-producer cells as well as an increase in protein production are seen, thereby reducing the number of clones to be screened and time to production by as much as 9 months. In this chapter, we describe how MARs can be used to increase transgene expression and provide protocols for the transfection of CHO cells in suspension and detection of high-producing antibody cell clones.
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Affiliation(s)
- Niamh Harraghy
- Laboratory of Molecular Biotechnology, University of Lausanne, Lausanne, Switzerland
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11
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Davies SL, O'Callaghan PM, McLeod J, Pybus LP, Sung YH, Rance J, Wilkinson SJ, Racher AJ, Young RJ, James DC. Impact of gene vector design on the control of recombinant monoclonal antibody production by Chinese hamster ovary cells. Biotechnol Prog 2011; 27:1689-99. [PMID: 21882365 DOI: 10.1002/btpr.692] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2011] [Revised: 05/17/2011] [Indexed: 01/17/2023]
Abstract
In this study, we systematically compare two vector design strategies for recombinant monoclonal antibody (Mab) synthesis by Chinese hamster ovary (CHO) cells; a dual open reading frame (ORF) expression vector utilizing separate cytomegalovirus (CMV) promoters to drive heavy chain (HC) and light chain (LC) expression independently, and a single ORF vector design employing a single CMV promoter to drive HC and LC polypeptide expression joined by a foot and mouth disease virus F2A polypeptide self-cleaving linker sequence. Initial analysis of stable transfectants showed that transfectants utilizing the single ORF vector designs exhibited significantly reduced Mab production. We employed an empirical modeling strategy to quantitatively describe the cellular constraints on recombinant Mab synthesis in all stable transfectants. In all transfectants, an intracellular molar excess of LC polypeptide over HC polypeptide was observed. For CHO cells transfected with the single ORF vectors, model-predicted, and empirical intracellular intermediate levels could only be reconciled by inclusion of nascent HC polypeptide degradation. Whilst a local sensitivity analysis showed that qMab of all transfectants was primarily constrained by recombinant mRNA translation rate, our data indicated that all single ORF transfectants exhibited a reduced level of recombinant gene transcription and that Mab folding and assembly reactions generically exerted greater control over qMab. We infer that the productivity of single ORF transfectants is limited by ER processing/degradation "capacity" which sets a limit on transcriptional input. We conclude that gene vector design for oligomeric recombinant proteins should be based on an understanding of protein-specific synthetic kinetics rather than polypeptide stoichiometry.
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Affiliation(s)
- Sarah L Davies
- Dept. of Chemical and Biological Engineering, University of Sheffield, Mappin St., Sheffield, U.K
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12
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Process analysis of reduced specific productivity of TNFR-Fc in Chinese hamster ovary cells at high cell density. Process Biochem 2011. [DOI: 10.1016/j.procbio.2011.04.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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13
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McLeod J, O'Callaghan PM, Pybus LP, Wilkinson SJ, Root T, Racher AJ, James DC. An empirical modeling platform to evaluate the relative control discrete CHO cell synthetic processes exert over recombinant monoclonal antibody production process titer. Biotechnol Bioeng 2011; 108:2193-204. [PMID: 21445882 DOI: 10.1002/bit.23146] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2010] [Revised: 01/31/2011] [Accepted: 03/14/2011] [Indexed: 12/16/2022]
Abstract
In this study we have combined empirically derived mathematical models of intracellular Mab synthesis to quantitatively compare the degree to which individual cellular processes limit recombinant IgG(4) monoclonal antibody production by GS-CHO cells throughout a state-of-the-art industrial fed-batch culture process. Based on the calculation of a production process control coefficient for each stage of the intracellular Mab synthesis and secretion pathway, we identified the major cellular restrictions on Mab production throughout the entire culture process to be recombinant heavy chain gene transcription and heavy chain mRNA translation. Surprisingly, despite a substantial decline in the rate of cellular biomass synthesis during culture, with a concomitant decline in the calculated rate constants for energy-intensive Mab synthetic processes (Mab folding/assembly and secretion), these did not exert significant control of Mab synthesis at any stage of production. Instead, cell-specific Mab production was maintained by increased Mab gene transcription which offset the decline in cellular biosynthetic rates. Importantly, this study shows that application of this whole-process predictive modeling strategy should rationally precede and inform cell engineering approaches to increase production of a recombinant protein by a mammalian host cell--where control of productivity is inherently protein product and cell line specific.
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Affiliation(s)
- Jane McLeod
- Department of Chemical and Biological Engineering, University of Sheffield, Mappin St., Sheffield S1 3JD, UK
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14
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Kou TC, Fan L, Zhou Y, Ye ZY, Liu XP, Zhao L, Tan WS. Detailed understanding of enhanced specific productivity in Chinese hamster ovary cells at low culture temperature. J Biosci Bioeng 2011; 111:365-9. [DOI: 10.1016/j.jbiosc.2010.11.016] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2010] [Revised: 11/09/2010] [Accepted: 11/20/2010] [Indexed: 11/29/2022]
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Xing Z, Bishop N, Leister K, Li ZJ. Modeling kinetics of a large-scale fed-batch CHO cell culture by Markov chain Monte Carlo method. Biotechnol Prog 2010; 26:208-19. [PMID: 19834967 DOI: 10.1002/btpr.284] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Markov chain Monte Carlo (MCMC) method was applied to model kinetics of a fed-batch Chinese hamster ovary cell culture process in 5,000-L bioreactors. The kinetic model consists of six differential equations, which describe dynamics of viable cell density and concentrations of glucose, glutamine, ammonia, lactate, and the antibody fusion protein B1 (B1). The kinetic model has 18 parameters, six of which were calculated from the cell culture data, whereas the other 12 were estimated from a training data set that comprised of seven cell culture runs using a MCMC method. The model was confirmed in two validation data sets that represented a perturbation of the cell culture condition. The agreement between the predicted and measured values of both validation data sets may indicate high reliability of the model estimates. The kinetic model uniquely incorporated the ammonia removal and the exponential function of B1 protein concentration. The model indicated that ammonia and lactate play critical roles in cell growth and that low concentrations of glucose (0.17 mM) and glutamine (0.09 mM) in the cell culture medium may help reduce ammonia and lactate production. The model demonstrated that 83% of the glucose consumed was used for cell maintenance during the late phase of the cell cultures, whereas the maintenance coefficient for glutamine was negligible. Finally, the kinetic model suggests that it is critical for B1 production to sustain a high number of viable cells. The MCMC methodology may be a useful tool for modeling kinetics of a fed-batch mammalian cell culture process.
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Affiliation(s)
- Zizhuo Xing
- Biotechnology Process Development, Bristol-Myers Squibb Company, Syracuse, NY 13057, USA
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O'Callaghan PM, McLeod J, Pybus LP, Lovelady CS, Wilkinson SJ, Racher AJ, Porter A, James DC. Cell line-specific control of recombinant monoclonal antibody production by CHO cells. Biotechnol Bioeng 2010; 106:938-51. [DOI: 10.1002/bit.22769] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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17
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Shen D, Kiehl TR, Khattak SF, Li ZJ, He A, Kayne PS, Patel V, Neuhaus IM, Sharfstein ST. Transcriptomic responses to sodium chloride-induced osmotic stress: A study of industrial fed-batch CHO cell cultures. Biotechnol Prog 2010; 26:1104-15. [DOI: 10.1002/btpr.398] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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18
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Whiteley EM, Hsu TA, Betenbaugh MJ. Modeling assembly, aggregation, and chaperoning of immunoglobulin G production in insect cells. Biotechnol Bioeng 2009; 56:106-16. [PMID: 18636615 DOI: 10.1002/(sici)1097-0290(19971005)56:1<106::aid-bit12>3.0.co;2-i] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
A model for immunoglobulin G (IgG) production in the baculovirus-insect cell system was developed that incorporates polypeptide synthesis, oligomer assembly, protein aggregation, and protein secretion. In addition, the capacity of a chaperone to protect heavy and light chain polypeptides from protein aggregation was considered by including in vitro chaperone-peptide binding and dissociation kinetic constants from the literature. Model predictions were then compared to experiments in which the chaperone immunoglobulin heavy chain binding protein, BiP, was coexpressed by coinfecting insect cells with BiP-containing baculovirus. The model predicted a nearly twofold increase in intracellular and secreted IgG that was similar to the behavior observed experimentally after approximately 3 days of coexpressing heterologous IgG and BiP. However, immunoglobulin aggregation was still significant in both the model simulation and experiments, so the model was then used to predict the effect of strategies for improving IgG production even further. Increasing expression of the chaperone BiP by 10-fold over current experimental levels provided a 2.5-fold increase in secreted IgG production over IgG assembly without BiP. Alternatively, the expression of BiP earlier in the baculovirus infection cycle achieved a twofold increase in protein secretion without requiring excessive BiP production. The potential effect of cochaperones on BiP activity was considered by varying the BiP binding and release constants. The utilization of lower binding and release kinetic constants led to a severalfold increase in IgG secretion because the polypeptides were protected from aggregation for greater periods. An optimized strategy for chaperone action would include the rapid peptide binding of a BiP-ATP conformation along with the slow peptide release of a BiP-ligand conformation. However, even with an optimized chaperoning system, limitations in the secretion kinetics can result in the accumulation of intracellular IgG. Thus, the entire secretory pathway must be considered when enhanced secretion of heterologous proteins is desired.
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Affiliation(s)
- E M Whiteley
- Department of Chemical Engineering, Johns Hopkins University, Baltimore, Maryland 21218, USA
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Khoo SHG, Al-Rubeai M. Detailed understanding of enhanced specific antibody productivity in NS0 myeloma cells. Biotechnol Bioeng 2009; 102:188-99. [DOI: 10.1002/bit.22041] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
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20
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Engineering Mammalian Cells for Recombinant Monoclonal Antibody Production. CELL ENGINEERING 2009. [DOI: 10.1007/978-90-481-2245-5_8] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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21
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Sun Z, Zhou R, Liang S, McNeeley KM, Sharfstein ST. Hyperosmotic Stress in Murine Hybridoma Cells: Effects on Antibody Transcription, Translation, Posttranslational Processing, and the Cell Cycle. Biotechnol Prog 2008; 20:576-89. [PMID: 15059005 DOI: 10.1021/bp0342203] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Mechanisms for increased antibody production in batch cultures of murine hybridoma cells in response to hyperosmotic stress were investigated. The rates of immunoglobulin transcription and protein translation and posttranslational processing were determined in control and hyperosmotic cultures. Changes in immunoglobulin transcription played a minor role in the increase in antibody production in response to hyperosmotic stress. In contrast, protein translation increased substantially in response to osmotic stress. However, the antibody translation rate remained relatively constant after correcting for the overall increase in protein translation. Cell size and intracellular antibody pool also increased in response to hyperosmolarity. The intracellular antibody pool increased proportionately with the increase in cell size, indicating that hyperosmotic cultures do not selectively increase their intracellular antibody population. Changes in cell cycle distribution in response to osmotic stress and the relationship between the cell cycle and antibody production were also evaluated. Hyperosmotic stress altered the cell cycle distribution, increasing the fraction of the cells in S-phase. However, this change was uncorrelated with the increase in antibody production rate. Immunoglobulin degradation was relatively low ( approximately 15%) and remained largely unchanged in response to hyperosmotic stress. There was no apparent increase in immunoglobulin stability as a result of osmotic stress. Antibody secretion rates increased approximately 50% in response to osmotic stress, with a commensurate increase in the antibody assembly rate. The rate of transit through the entire posttranslational processing apparatus increased, particularly for immunoglobulin light chains. The levels of endoplasmic reticulum chaperones did not increase as a fraction of the total cellular protein but were increased on a per cell basis as the result of an increase in total cellular protein. A difference in the interactions between the immunoglobulin heavy chains and BiP/GRP78 was observed in response to hyperosmotic conditions. This change in interaction may be correlated with the decrease in transit time through the posttranslational pathways. The increase in the posttranslational processing rate appears to be commensurate with the increase in antibody production in response to hyperosmotic stress.
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Affiliation(s)
- Zhe Sun
- Department of Bioengineering, University of Toledo, Toledo, Ohio 43606, USA
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Schlatter S, Stansfield SH, Dinnis DM, Racher AJ, Birch JR, James DC. On the Optimal Ratio of Heavy to Light Chain Genes for Efficient Recombinant Antibody Production by CHO Cells. Biotechnol Prog 2008; 21:122-33. [PMID: 15903249 DOI: 10.1021/bp049780w] [Citation(s) in RCA: 159] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Monoclonal antibodies (Mab) are heterotetramers consisting of an equimolar ratio of heavy chain (HC) and light chain (LC) polypeptides. Accordingly, most recombinant Mab expression systems utilize an equimolar ratio of heavy chain (hc) to light chain (lc) genes encoded on either one or two plasmids. However, there is no evidence to suggest that this gene ratio is optimal for stable or transient production of recombinant Mab. In this study we have determined the optimal ratio of hc:lc genes for production of a recombinant IgG4 Mab, cB72.3, by Chinese hamster ovary (CHO) cells using both empirical and mathematical modeling approaches. Polyethyleneimine-mediated transient expression of cB72.3 at varying ratios of hc:lc genes encoded on separate plasmids yielded an optimal Mab titer at a hc:lc gene ratio of 3:2; a conclusion confirmed by separate mathematical modeling of the Mab folding and assembly process using transient expression data. On the basis of this information, we hypothesized that utilization of hc genes at low hc:lc gene ratios is more efficient. To confirm this, cB72.3 Mab was transiently produced by CHO cells at constant hc and varying lc gene dose. Under these conditions, Mab yield was increased with a concomitant increase in lc gene dose. To determine if the above findings also apply to stably transfected CHO cells producing recombinant Mab, we compared the intra- and extracellular ratios of HC and LC polypeptides for three GS-CHO cells lines transfected with a 1:1 ratio of hc:lc genes and selected for stable expression of the same recombinant Mab, cB72.3. Intra- and extracellular HC:LC polypeptide ratios ranged from 1:2 to 1:5, less than that observed on transient expression of the same Mab in parental CHO cells using the same vector. In conclusion, our data suggest that the optimal ratio of hc:lc genes used for transient and stable expression of Mab differ. In the case of the latter, we infer that optimal Mab production by stably transfected cells represents a compromise between HC abundance limiting productivity and the requirement for excess LC to render Mab folding and assembly more efficient.
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Affiliation(s)
- Stefan Schlatter
- School of Engineering, University of Queensland, QLD 4072, Australia, and Lonza Biologics plc, 228 Bath Road, Slough SL1 4DX, UK
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Stansfield SH, Allen EE, Dinnis DM, Racher AJ, Birch JR, James DC. Dynamic analysis of GS-NS0 cells producing a recombinant monoclonal antibody during fed-batch culture. Biotechnol Bioeng 2007; 97:410-24. [PMID: 17115445 DOI: 10.1002/bit.21263] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
In this study we have analyzed the dynamic covariation of the mammalian cell proteome with respect to functional phenotype during fed-batch culture of NS0 murine myeloma cells producing a recombinant IgG(4) monoclonal antibody. GS-NS0 cells were cultured in duplicate 10 L bioreactors (36.5 degrees C, 15% DOT, pH 7.0) for 335 h and supplemented with a continuous feed stream after 120 h. Cell-specific growth rate declined continuously after 72 h of culture. Cell-specific recombinant monoclonal antibody production rate (qP) varied sixfold through culture. Whilst qP correlated with relative recombinant heavy chain mRNA abundance up to 216 h, qP subsequently declined, independent of recombinant heavy chain or light chain mRNA abundance. GS-NS0 cultures were sampled at 48 h intervals between 24 and 264 h of culture for proteomic analyses. Total protein abundance and nascent polypeptide synthesis was determined by 2D PAGE of unlabeled proteins visualized by SYPRO Ruby and autoradiography of (35)S-labeled polypeptides, respectively. Covariation of nascent polypeptide synthesis and abundance with biomass-specific cell growth, glucose and glutamate consumption, lactate and Mab production rates were then examined using two partial least squares regression models. Most changes in polypeptide synthesis or abundance for proteins previously identified by mass spectrometry were positively correlated with biomass-specific growth rate. We conclude that the substantial transitions in cell physiology and qP that occur during culture utilize a relatively constant complement of the most abundant host cell machines that vary primarily with respect to induced changes in cell growth rate.
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Teixeira AP, Carinhas N, Dias JML, Cruz P, Alves PM, Carrondo MJT, Oliveira R. Hybrid semi-parametric mathematical systems: bridging the gap between systems biology and process engineering. J Biotechnol 2007; 132:418-25. [PMID: 17870200 DOI: 10.1016/j.jbiotec.2007.08.020] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2007] [Revised: 07/22/2007] [Accepted: 08/03/2007] [Indexed: 01/23/2023]
Abstract
Systems biology is an integrative science that aims at the global characterization of biological systems. Huge amounts of data regarding gene expression, proteins activity and metabolite concentrations are collected by designing systematic genetic or environmental perturbations. Then the challenge is to integrate such data in a global model in order to provide a global picture of the cell. The analysis of these data is largely dominated by nonparametric modelling tools. In contrast, classical bioprocess engineering has been primarily founded on first principles models, but it has systematically overlooked the details of the embedded biological system. The full complexity of biological systems is currently assumed by systems biology and this knowledge can now be taken by engineers to decide how to optimally design and operate their processes. This paper discusses possible methodologies for the integration of systems biology and bioprocess engineering with emphasis on applications involving animal cell cultures. At the mathematical systems level, the discussion is focused on hybrid semi-parametric systems as a way to bridge systems biology and bioprocess engineering.
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Affiliation(s)
- Ana P Teixeira
- IBET/ITQB, Instituto de Biologia Experimental e Tecnológica/Instituto de Tecnologia Química e Biológica, Apartado 12, 2781-901 Oeiras, Portugal
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25
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De Alwis DM, Dutton RL, Scharer J, Moo-Young M. Statistical methods in media optimization for batch and fed-batch animal cell culture. Bioprocess Biosyst Eng 2007; 30:107-13. [PMID: 17242929 DOI: 10.1007/s00449-006-0107-7] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2006] [Revised: 11/16/2006] [Accepted: 12/12/2006] [Indexed: 12/21/2022]
Abstract
Hybridoma 130-8F producing anti-F monoclonal antibodies (MAb) were grown in batch and fed-batch mode with glutamine as the limiting substrate. The initial concentration of glucose varied between 10 and 25 mM but was not growth limiting. Monoclonal antibody production was identified as being partially growth associated. Employing the cumulative cell hour concept, external metabolic flux estimates were calculated during the exponential growth phase for MAb, glucose, amino acids, ammonia and lactate. Through nutritional profiling using principal component analysis (PCA) followed by partial least squares regression (PLS), key metabolites were identified and grouped for significant positive, significant negative, low level, and negligible correlation to MAb production, cellular growth, glucose consumption, and ammonia and lactate production. Significant relationships peculiar to Hybridoma 130-8F were identified, such as demand for two normally non-essential amino acids (asparagine and aspartic acid), and the positive correlation between MAb and ammonia production.
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Affiliation(s)
- Diliny M De Alwis
- Department of Chemical Engineering, University of Waterloo, Waterloo, ON, Canada
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26
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Zhou F, Bi JX, Zeng AP, Yuan JQ. A macrokinetic and regulator model for myeloma cell culture based on metabolic balance of pathways. Process Biochem 2006. [DOI: 10.1016/j.procbio.2006.08.001] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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27
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Gasser B, Maurer M, Gach J, Kunert R, Mattanovich D. Engineering of Pichia pastoris for improved production of antibody fragments. Biotechnol Bioeng 2006; 94:353-61. [PMID: 16570317 DOI: 10.1002/bit.20851] [Citation(s) in RCA: 157] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
The methylotrophic yeast Pichia pastoris has been used for the expression of many proteins, including antibody fragments. However, limitations became obvious especially when secreting heterodimeric Fab fragments. Up-to-date, antibody fragments have only been expressed under control of the strong inducible alcohol oxidase 1 (AOX1) promoter, which may stress the cells by excessive transcription. Here, we examined the secretion characteristics of single chain and Fab fragments of two different monoclonal anti-HIV1 antibodies (2F5 and 2G12) with both the AOX1 and the glyceraldehyde-3-phosphate dehydrogenase (GAP) promoter. Also, the influences of different secretion leaders and strains were evaluated. Interestingly, secretion was only achieved when using the GAP promoter and the Saccharomyces cerevisiae mating factor alpha (MFalpha leader), whereas there was no difference between the two P. pastoris strains. During fed batch fermentation of a 2F5 Fab expressing strain, intracellular retention of Fab heavy chains was observed, while both intact Fab and single light chain molecules were only detected in the supernatants. This led to the conclusion that protein folding and heterodimer assembly in the ER are rate limiting steps in Fab secretion. To alleviate this limitation, S. cerevisiae protein disulfide isomerase (PDI) and the unfolded protein response (UPR) transcription factor HAC1 were constitutively overexpressed in P. pastoris. While the overexpression of HAC1 led to a moderate increase of Fab secretion of 1.3-fold, PDI enabled an increase of the Fab level by 1.9-fold. Hence, the formation of interchain disulfide bonds can be seen as a major rate limiting factor to Fab assembly and subsequent secretion.
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Affiliation(s)
- Brigitte Gasser
- Institute of Applied Microbiology, BOKU University of Natural Resources and Applied Life Sciences Vienna, Muthgasse 18, A-1190 Vienna, Austria
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Ho Y, Varley J, Mantalaris A. Development and Analysis of a Mathematical Model for Antibody-Producing GS-NS0 Cells Under Normal and Hyperosmotic Culture Conditions. Biotechnol Prog 2006. [DOI: 10.1002/bp060032b] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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29
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Rounseville KJ, Chau PC. Three-dimensional cell cycle model with distributed transcription and translation. Med Biol Eng Comput 2005; 43:155-61. [PMID: 15742735 DOI: 10.1007/bf02345138] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A computational cell cycle model that can describe three state properties, cell maturation age, specific mRNA and protein content, has been developed. Cell cycle progression is monitored by maturation age, and population heterogeneity is generated by the introduction of a probable random event embedded in the G1 phase. Specific mRNA is generated with a constant transcription rate at the single-cell level, and its turnover is governed by a first-order decay. Translation is modelled as a first-order dependence on the transcripts, and the protein product is subsequently exported. Dynamic chemostat simulations are used to demonstrate the ability of the model to track evolving parent and daughter subpopulations in maturation and cellular contents. The cell subpopulations eventually converge to an equilibrium distribution corresponding to the steady state of a chemostat, and halving of cellular content at cell division is the dominant driving force leading towards the population equilibrium state.
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Affiliation(s)
- K J Rounseville
- Chemical Engineering Program, University of California, San Diego La Jolla, California, USA
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30
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Shen D, Sharfstein ST. Genome-wide analysis of the transcriptional response of murine hybridomas to osmotic shock. Biotechnol Bioeng 2005; 93:132-45. [PMID: 16196057 DOI: 10.1002/bit.20691] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Hyperosmotic stress has been shown to increase specific antibody productivity in murine hybridoma systems; however, the mechanisms underlying this phenomenon are still poorly understood. To elucidate the mechanisms for this phenomenon as well as other physiological changes that occur in response to hyperosmotic stress, we performed a genome-wide analysis of the transcriptional response of murine hybridoma OKT3 toward hyperosmotic stress using DNA microarrays. GeneChip MOE430A from Affymetrix was used to determine the differences in transcription patterns between OKT3 in hyperosmotic culture (approximately 100 mOsm above control) and control culture. The chip contains 22,690 probe sets for over 14,000 known genes and more than 4,000 ESTs. Signals were normalized using the GC-RMA algorithm and the effectiveness of hyperosmotic stress in altering the expression of each gene was evaluated using one-way ANOVA. 2,793 probe sets on the chip were differentially expressed with a P < 0.05. Among them, 349 probe sets exhibited a two-fold or greater change (with 202 up-regulated and 147 down-regulated) at one or more time points. Within the 215 characterized, differentially expressed genes, many are involved in metabolism/catabolism (19 induced, 12 repressed), cell-cycle regulation (10 induced, 5 repressed) and apoptosis (8 induced, 2 repressed), regulation of transcription (18 induced, 13 repressed) and translation (2 induced, 2 repressed), transport and signaling pathways (24 induced, 12 repressed). Surprisingly, there were very few changes within the stress-response genes. Interestingly, the transcription levels of both the immunoglobulin kappa and lambda light chains showed a significant change in response to hyperosmotic stress, although there is no detectable lambda chain in the immunoglobulin produced in this cell line. Quantitative PCR assays with TaqMan probes were applied to selected genes to validate the results obtained from microarray analysis.
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Affiliation(s)
- Duan Shen
- Department of Chemical and Biological Engineering, Rensselaer Polytechnic Institute, Troy, New York 12180, USA
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31
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Böhm E, Voglauer R, Steinfellner W, Kunert R, Borth N, Katinger H. Screening for improved cell performance: Selection of subclones with altered production kinetics or improved stability by cell sorting. Biotechnol Bioeng 2004; 88:699-706. [PMID: 15532061 DOI: 10.1002/bit.20271] [Citation(s) in RCA: 35] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
One of the major problems in the biotechnology industry is the selection of cell lines well suited for production of biopharmaceutical proteins. Usually, the most important selection criterion is the cell specific production rate. Nevertheless, a good producer cell line should have a number of additional advantageous properties, which allow the cell line to perform well in the type of bioreactor chosen for the process. However, the time and work required to select for high production rates as well as the lack of methods to specifically select for other cellular properties, usually prevents researchers from including such criteria into their screening program. With the Single Cell Secretion Assay it is possible to measure the specific production rates of individual cells by catching secreted product in an artificial matrix applied to the cell surface. Flow cytometric cell sorting then allows selection of rare cells with high production rates, which occur at frequencies as low as 10(-6). By combining this method with culture conditions that bring out a desired cellular property, we were able to isolate subclones with similar production rates, but improved performance from a recombinant Chinese hamster ovary cell line producing a human monoclonal antibody. The two desired cellular properties screened for were a non-growth associated production kinetic and improved stability in the absence of selective pressure.
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Affiliation(s)
- Ernst Böhm
- Institute of Applied Microbiology, University of Agricultural Sciences, Muthgasse 18, 1190 Vienna, Austria
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32
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Merten OW, Moeurs D, Keller H, Leno M, Palfi GE, Cabanié L., Couvé E. Modified monoclonal antibody production kinetics kappa/gamma mRNA levels, and metabolic activities in a murine hybridoma selected by continuous Culture. Biotechnol Bioeng 2004; 44:753-64. [DOI: 10.1002/bit.260440612] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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33
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Simmons LC, Reilly D, Klimowski L, Raju TS, Meng G, Sims P, Hong K, Shields RL, Damico LA, Rancatore P, Yansura DG. Expression of full-length immunoglobulins in Escherichia coli: rapid and efficient production of aglycosylated antibodies. J Immunol Methods 2002; 263:133-47. [PMID: 12009210 DOI: 10.1016/s0022-1759(02)00036-4] [Citation(s) in RCA: 221] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Abstract
Many research and clinical applications require large quantities of full-length antibodies with long circulating half-lives, and production of these complex multi-subunit proteins has in the past been restricted to eukaryotic hosts. In this report, we demonstrate that efficient secretion of heavy and light chains in a favorable ratio leads to the high-level expression and assembly of full-length IgGs in the Escherichia coli periplasm. The technology described offers a rapid, generally applicable and potentially inexpensive method for the production of full-length therapeutic antibodies, as verified by the expression of several humanized IgGs. One E. coli-derived antibody in particular, anti-tissue factor IgG1, has been thoroughly evaluated and has all of the expected properties of an aglycosylated antibody, including tight binding to antigen and the neonatal receptor. As predicted, the protein lacks binding to C1q and the FcgammaRI receptor, making it an ideal candidate for research purposes and therapeutic indications where effector functions are either not required or are actually detrimental. In addition, a limited chimpanzee study suggests that the E. coli-derived IgG1 retains the long circulating half-life of mammalian cell-derived antibodies.
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Affiliation(s)
- Laura C Simmons
- Department of Molecular Biology, Genentech, Inc., 1 DNA Way, South San Francisco, CA 94080, USA
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34
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Gonz lez R, Andrews BA, Asenjo JA. Kinetic model of BiP- and PDI-mediated protein folding and assembly. J Theor Biol 2002; 214:529-37. [PMID: 11851365 DOI: 10.1006/jtbi.2001.2478] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A mechanism for heavy chain binding protein (BiP)- and protein disulfide isomerase (PDI)- mediated protein folding and assembly has been proposed. It considers BiP chaperoning action and PDI catalytic activity. A kinetic model has been developed based on the proposed mechanism. The model was used for quantifying the influence of polypeptide concentration and ratio, and the effect of BiP and PDI concentration on the kinetics of folding and assembly. An optimum value for polypeptide concentration that minimizes assembly times was found, and different kinetic behaviors were identified for polypeptide concentrations higher or lower than the optimum. Pulse-chase experiments and the dependence of assembly time on unassembled polypeptides ratio predicted by the model are similar to those found during in vitro and in vivo folding and assembly of antibodies and human chorionic gonadotropin (hCG), as well as bovine pancreatic trypsin inhibitor (BPTI) folding. The model also explains the increase in folding and assembly rates during overexpression of BiP and PDI.
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Affiliation(s)
- Ramon Gonz lez
- Centre for Biochemical Engineering and Biotechnology, Department of Chemical Engineering, Millenium Institute for Advanced Studies in Cell Biology and Biotechnology, University of Chile, Beauchef 861, Santiago, Chile
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35
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Gonzalez R, Andrews BA, Asenjo JA. Metabolic control analysis of monoclonal antibody synthesis. Biotechnol Prog 2001; 17:217-26. [PMID: 11312697 DOI: 10.1021/bp000165b] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A general route for protein synthesis in eukaryotic cells has been proposed and applied to monoclonal antibody (MAb) synthesis. It takes into account transcription of the gene, binding of ribosomes to mRNA, and polypeptide elongation including binding to SRP (signal recognition particles) and SRP-receptor, competing translocation, folding and glycosylation, assembly of the heavy and light chains in a tetrameric protein and Golgi processing and secretion. A comprehensive model was built on the basis of the proposed pathway. The model takes into account the mechanism of each step. Metabolic control analysis (MCA) principles were applied to the general pathway using the proposed model, and control coefficients were calculated. The results show a shared flux control (of both pathway flux and flux ratio at the branch) among different steps, i.e., transcription, folding, glycosylation, translocation and building blocks synthesis. The steps sharing the control depend on the concentration of building blocks, pathway flux and levels of OST (oligosacharyl transferase), BiP (heavy chain binding protein) and PDI (protein disulfide isomerase). Model predictions compare well with experimental data for MAb synthesis, explaining the control structure of the route and the heterogeneity of the product and also addressing future targets for improvement of the production rate of MAbs.
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Affiliation(s)
- R Gonzalez
- Millenium Institute for Advanced Studies in Cell Biology and Biotechnology, Centre for Biochemical Engineering and Biotechnology, Department of Chemical Engineering, University of Chile, Beauchef 861, Santiago, Chile
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Abstract
When subjected to hyperosmotic pressure resulting from NaCl addition, KR12H-2 transfectoma, like most hybridomas, displayed a decrease in specific growth rate (mu) and an increase in specific antibody productivity (q(Ab)). Elevation of medium osmolality from 285 to 425 mOsm/kg decreased mu by 20%, while it increased q(Ab) by 376%. Although cell mass also increased at higher osmolality, it was not the main factor in increasing q(Ab). Hyperosmotic pressure was found to enhance transcription levels of immunoglobulin (Ig) mRNAs preferentially, compared with non-IgG mRNA. The transcription levels of both heavy chain (HC) and light chain (LC) mRNAs were enhanced as much as q(Ab). This result suggests that enhanced q(Ab) at higher osmolality was mainly due to enhanced transcription levels of Ig mRNA. However, these increased transcription levels of Ig mRNAs were not due to the enhanced stability of Ig mRNA. In fact, the stability of Ig mRNAs decreased at higher osmolality. Elevation of osmolality from 285 mOsm/kg to 425 mOsm/kg decreased the half-lives of HC and LC mRNAs by 37% and 36%, respectively. A simple mathematical model revealed that transcription rates of Ig mRNAs increased by more than 476% at 425 mOsm/kg. These elevated transcription levels could, in turn, increase the translation rates of Ig polypeptides. However, the translation rates of Ig polypeptides were not enhanced as much as the transcription levels of Ig mRNAs and q(Ab). The elevation of osmolality from 285 mOsm/kg to 425 mOsm/kg increased HC and LC mRNA specific translation rates by 172% and 240%, respectively. Taken together, the data suggest that (1) enhanced q(Ab) of KR12H-2 transfectoma at higher osmolality is due to elevated transcription rates of Ig mRNAs and expedited post-translational processing of Ig, and (2) antibody secretion by KR12H-2 transfectoma is most likely controlled at the level of Ig translation, particularly HC translation.
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Affiliation(s)
- M S Lee
- Department of Biological Sciences, Korea Advanced Institute of Science and Technology 373-1, Kusong-Dong, Yusong-Gu, Taejon 305-701, Korea
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37
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Effects of high cell density on growth-associated monoclonal antibody production by hybridoma T0405 cells immobilized in macroporous cellulose carriers. BIOTECHNOL BIOPROC E 2000. [DOI: 10.1007/bf02931881] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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38
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An unstructured kinetic model of macromolecular metabolism in batch and fed-batch cultures of hybridoma cells producing monoclonal antibody. Biochem Eng J 2000. [DOI: 10.1016/s1369-703x(99)00041-8] [Citation(s) in RCA: 53] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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39
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40
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Fann CH, Guarna MM, Kilburn DG, Piret JM. Relationship between recombinant activated protein C secretion rates and mRNA levels in baby hamster kidney cells. Biotechnol Bioeng 1999; 63:464-72. [PMID: 10099627 DOI: 10.1002/(sici)1097-0290(19990520)63:4<464::aid-bit10>3.0.co;2-h] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
Analysis of 12 baby hamster kidney (BHK) clones in exponential growth revealed a linear relationship between cell-specific recombinant activated protein C (APC) production rates and APC mRNA levels. This correlation indicated that mRNA levels limited APC productivity. Two strategies were employed to increase APC mRNA levels and APC productivity. First, sodium butyrate was added to increase mRNA levels by two- to sixfold in five APC-producing clones to obtain up to 2.7-fold increase in APC production rate. The second strategy was to retransfect an APC-producing BHK cell line with a vector containing additional APC cDNA and a mutant DHFR. This mutant DHFR gene allowed the selection of retransfected clones in higher MTX concentrations. Over two-fold higher mRNA levels were obtained in these retransfected clones and the cell-specific APC production rate increased twofold. At the highest level of APC secretion, increases in mRNA levels did not result in higher rates of APC production. Analysis of the intracellular APC content revealed a possible saturation in the secretory pathway at high mRNA levels. The relation between mRNA level and APC secretion rate was also investigated in batch culture. The levels of total cellular RNA, APC mRNA, and beta-actin mRNA were relatively stable while cells were in the exponential growth phase, but rapidly decreased when cells reached the stationary phase. The decline of cell-specific APC mRNA levels correlated with a decline in APC secretion rates, which indicated that the mRNA levels continued to limit the rates beyond the exponential phase and into the declining growth and stationary phases of batch APC production.
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Affiliation(s)
- C H Fann
- Biotechnology Laboratory and Department of Chemical & Bio-Resource Engineering 237-6174 University Boulevard, University of British Columbia, Vancouver, British Columbia V6T 1Z3, Canada
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41
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Martial-Gros A, Sarin KK, Mukhopadhyay A, Ghosh S. Feasibility studies of large scale production of human anti-tetanus toxoid monoclonal antibodies. J Biotechnol 1999; 67:205-16. [PMID: 9990734 DOI: 10.1016/s0168-1656(98)00182-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The feasibility of large scale production of human anti-tetanus toxoid monoclonal antibody for therapeutic use was evaluated using a human heterohybridoma. The effects of duration of subculture, transition from static to agitated culture conditions and the level of serum concentration were studied. The level of antibody secreted by the clone decreased with increasing length of subculture and decreasing serum concentration. The clone exhibited heterogeneity in expression of surface IgG after 2 or 7 weeks of subculture in static culture conditions irrespective of the serum concentration. However, a prolonged duration of subculture (9 weeks) in 3% serum medium had an effect on the expression of surface IgG both in static and agitated culture conditions. With respect to total (surface and intracellular) IgG, two distinct cell populations were observed. On long term subculture (9 weeks) in low serum medium (3% FCS), there was a decrease in the population which was the high synthesizer. In addition, when these cells were cultivated in agitated spinner flasks, a defect in secretion of antibodies was observed. Thus a general fall in the amount of antibody in the supernatant of agitated cultures was due to decrease in antibody synthesis as well as the defect in secretion of antibodies.
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Affiliation(s)
- A Martial-Gros
- National Institute of Immunology, Aruna Asaf Ali Marg, New-Delhi, India
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43
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Lambert N, Merten OW. Effect of serum-free and serum-containing medium on cellular levels of ER-based proteins in various mouse hybridoma cell lines. Biotechnol Bioeng 1997; 54:165-80. [DOI: 10.1002/(sici)1097-0290(19970420)54:2<165::aid-bit8>3.0.co;2-j] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
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44
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Pörtner R, Schäfer T. Modelling hybridoma cell growth and metabolism--a comparison of selected models and data. J Biotechnol 1996; 49:119-35. [PMID: 8879168 DOI: 10.1016/0168-1656(96)01535-0] [Citation(s) in RCA: 98] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Unstructured models for cell growth (cell specific growth and death rate) and metabolism (cell specific substrate uptake and metabolite production rates) of hybridoma cell lines were compared with special respect to significance, analytical error and range of validity. The diversity of the unstructured models cited reveals their mostly descriptive character compared to structured models. Bearing in mind this limited knowledge, empirical models can still serve as a valuable tool for process design. For understanding of the cell metabolism itself they might have been overemphasized in the past. For proper model design, care has to be taken to cover the whole range of process conditions. In particular if a process is to be run at very low substrate and high metabolite concentrations, chemostat cultures which have mostly been used for the model formulations, are not sufficient and have to be completed by, for example, fed-batch cultures.
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Affiliation(s)
- R Pörtner
- Department of Bioprocess and Biochemical Engineering, Technical University Hamburg-Harburg, Germany
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Subramanian S, Srienc F. Quantitative analysis of transient gene expression in mammalian cells using the green fluorescent protein. J Biotechnol 1996; 49:137-51. [PMID: 8879169 DOI: 10.1016/0168-1656(96)01536-2] [Citation(s) in RCA: 70] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
The green fluorescent protein (Gfp) has been used as a reporter, along with flow cytometric analysis, to follow the dynamics of gene expression in transiently transfected mammalian cells. Gene transfer conditions for lipofection were optimized. The highest fraction of transfectants were obtained when lipid-DNA complexes were formed with 6 microliters lipid and 1 microgram DNA for chinese hamster ovary (CHO) cells and with 9 microliters lipid and 2 micrograms DNA for NIH/3T3 cells. Chinese hamster ovary cells were monitored for Gfp expression and growth for 6 days following transfection. An initial decrease in viability for 36 h was observed after which cell growth followed exponential kinetics with increasing viability. Intracellular accumulation of recombinant protein peaked at 24 h post-transfection and then decreased with first order kinetics at a rate comparable to the specific growth rate. It appears that dilution by growth accounts for the decrease of Gfp in the biomass. Immunofluorescent staining of Gfp and subsequent flow cytometric analysis of transfected cells revealed a linear correlation between the green fluorescence and immunofluorescence. This indicates that green fluorescence is a quantitative measure of intracellular Gfp in single cells in spite of the dynamics of post-translational modifications involved in the conversion of expressed protein into its fluorescent form. A structured model has been formulated to describe the observed kinetics of gene expression and fluorophore formation. The model accurately predicts experimental trends and suggests that the fraction of non-fluorescent Gfp is significant only during the initial period of gene expression.
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Affiliation(s)
- S Subramanian
- Institute for Advanced Studies in Biological Process Technology, University of Minnesota, St. Paul 55108, USA
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Structured modelling of animal cells. Cytotechnology 1996; 21:149-53. [DOI: 10.1007/bf02215664] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/1994] [Accepted: 07/15/1995] [Indexed: 11/25/2022] Open
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Yang X, Oehlert GW, Flickinger MC. Use of the weighted jackknife method to calculate the variance in cellular-specific protein secretion rate: Application to monoclonal antibody secretion rate kinetics in response to osmotic stress. Biotechnol Bioeng 1996; 50:184-96. [DOI: 10.1002/(sici)1097-0290(19960420)50:2<184::aid-bit7>3.0.co;2-i] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Mukhopadhyay A, Mukhopadhyay SN, Talwar GP. Studies on the synthesis of ?hCG hormone in vero cells by recombinant vaccinia virus. Biotechnol Bioeng 1995; 48:158-68. [DOI: 10.1002/bit.260480210] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Martens DE, Sipkema EM, de Gooijer CD, Beuvery EC, Tramper J. A combined cell-cycle and metabolic model for the growth of hybridoma cells in steady-state continuous culture. Biotechnol Bioeng 1995; 48:49-65. [DOI: 10.1002/bit.260480109] [Citation(s) in RCA: 20] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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