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Updated: May 19, 2026
Rapid Antibody Glycoengineering in Chinese Hamster Ovary Cells
Published on: June 2, 2022
Determination of Chinese hamster ovary cell line stability and recombinant antibody expression during long-term
Laura A Bailey1, Diane Hatton, Ray Field
1Faculty of Life Sciences, University of Manchester, Manchester, UK.
Abstract:
Chinese hamster ovary (CHO) cell lines are frequently used as hosts for the production of recombinant therapeutics, such as monoclonal antibodies, due to their ability to perform correct post-translational modifications. A potential issue when utilizing CHO cells for therapeutic protein production is the selection of cell lines that do not retain stable protein expression during long-term culture (LTC). Instability of expression impairs process yields, effective usage of time and money, and regulatory approval for the desired therapeutic. In this study, we investigated a model unstable GS-CHO cell line over a continuous period of approximately 100 generations to determine markers of mechanisms that underlie instability. In this cell line, stability of expression was retained for 40-50 generations after which time a 40% loss in antibody production was detected. The instability observed within the cell line was not due to a loss in recombinant gene copy number or decreased expression of mRNA encoding for recombinant antibody H or L chain, but was associated with lower cumulative cell time values and an apparent increased sensitivity to cellular stress (exemplified by increased mRNA expression of the stress-inducible gene GADD153). Changes were also noted in cellular metabolism during LTC (alterations to extracellular alanine accumulation, and enhanced rates of glucose and lactate utilization, during the exponential and decline phase of batch culture, respectively). Our data indicates the breadth of changes that may occur to recombinant CHO cells during LTC ranging from instability of recombinant target production at a post-mRNA level to metabolic events. Definition of the mechanisms, regulatory events, and linkages underpinning cellular phenotype changes require further detailed analysis at a molecular level.
Insights
Chinese hamster ovary (CHO) cell lines can lose therapeutic protein production stability over time. This study identified cellular stress and metabolic changes, not gene loss, as key factors in expression instability during long-term culture.
Area of Science:
- Biotechnology
- Cell Biology
- Bioprocessing
Background:
- Chinese hamster ovary (CHO) cells are vital for recombinant therapeutic production, including monoclonal antibodies.
- Maintaining stable protein expression during long-term culture (LTC) is crucial for process efficiency and regulatory approval.
- Expression instability in CHO cell lines can significantly reduce process yields and economic viability.
Purpose of the Study:
- To investigate the mechanisms underlying expression instability in a model unstable GS-CHO cell line over approximately 100 generations.
- To identify molecular and metabolic markers associated with the loss of stable protein production during LTC.
- To elucidate the factors contributing to recombinant protein expression decline in CHO cells.
Main Methods:
- Long-term culture (LTC) of a model unstable GS-CHO cell line for ~100 generations.
- Monitoring antibody production levels over culture duration.
- Analysis of recombinant gene copy number and mRNA expression.
- Assessment of cellular stress markers (e.g., GADD153 mRNA).
- Evaluation of metabolic changes, including extracellular alanine and glucose/lactate utilization.
Main Results:
- A 40% loss in antibody production was observed after 40-50 generations in the unstable GS-CHO cell line.
- Instability was not linked to reduced gene copy number or antibody chain mRNA levels.
- Expression instability correlated with lower cumulative cell time and increased sensitivity to cellular stress (elevated GADD153 mRNA).
- Significant metabolic alterations were detected during LTC, including changes in alanine accumulation and glucose/lactate utilization rates.
Conclusions:
- Recombinant CHO cell instability during LTC involves complex changes beyond gene copy number or mRNA expression.
- Increased cellular stress and metabolic dysregulation are key factors contributing to reduced therapeutic protein production.
- Further molecular-level analysis is required to fully understand the regulatory events and mechanisms driving CHO cell phenotype changes during LTC.
