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Translating Blue Light Stimulation From Batch to Perfusion: Process and Intracellular Metabolic Analysis
Stefanie Föller1, Attila Teleki1, Ralf Takors1
1Institute of Biochemical Engineering, University of Stuttgart, Stuttgart, Baden-Württemberg, Germany.
Biotechnology and Bioengineering
|June 29, 2026
Summary
Blue light illumination boosts monoclonal antibody production in CHO cells by up to 37% in biomanufacturing. This non-invasive method enhances productivity without causing significant metabolic stress, offering a promising strategy for process intensification.
Area of Science:
- Biotechnology
- Cell Biology
- Bioprocess Engineering
Background:
- Cell-specific productivity is critical for efficient biopharmaceutical manufacturing.
- Chinese Hamster Ovary (CHO) cells are widely used for producing monoclonal antibodies like IgG1.
- Optimizing cell culture conditions is essential for maximizing therapeutic protein yields.
Purpose of the Study:
- To investigate the impact of blue light illumination on IgG1 production in CHO DP-12 cells.
- To evaluate the effects of blue light across different bioprocess modes: batch, fed-batch, and perfusion.
- To analyze the metabolic responses of cells to blue light exposure.
Main Methods:
- Controlled 3L bioreactor systems were used for cell cultivation.
- Blue light exposure was applied to CHO DP-12 cell cultures.
- Cell-specific productivity, growth, viable cell density, and metabolic parameters were analyzed.
- Metabolic characterization included analysis of lactate, glucose, amino acid pools, adenylate energy charge, and redox status.
Main Results:
- Blue light consistently increased cell-specific monoclonal antibody productivity by 30%-37% in batch/fed-batch and up to 13% overall in perfusion cultures.
- Illumination led to increased lactate production with unchanged glucose consumption.
- Reduced amino acid pools and a more reduced intracellular environment (glutathione ratios, redox potential) were observed.
- No significant perturbations in central carbon metabolism or detrimental metabolic stress were detected.
Conclusions:
- Blue light illumination enhances cell-specific productivity in CHO cells without inducing significant metabolic stress.
- The observed metabolic phenotype is characterized by increased protein synthesis and a more reduced intracellular environment.
- Optimized blue light exposure is a promising, non-invasive strategy for biopharmaceutical process intensification.
