Deciphering Metabolic Pathways in High-Seeding-Density Fed-Batch Processes for Monoclonal Antibody Production: A...

Area of Science:

• Biotechnology
• Cell Culture Engineering
• Metabolic Engineering

Background:

• Monoclonal antibodies (mAbs) are critical therapeutics, with production efficiency significantly impacted by cell culture processes.
• High-seeding-density (HSD) strategies have emerged as a key advancement for improving mAb titers in Chinese hamster ovary (CHO) cell cultures.
• Understanding cellular metabolism under HSD conditions is essential for further process optimization.

Purpose of the Study:

• To investigate the metabolic effects of high seeding processes for mAb production in CHO cells.
• To identify key metabolites and their interactions influencing mAb titers under HSD conditions.
• To compare metabolic profiles of standard fed-batch (STD FB) and HSD cultivations.

Main Methods:

• Cultivation of CHO cells using standard fed-batch and high-seeding-density strategies.
• Metabolic flux analysis using reconstructed metabolic networks and kinetic models.
• Analysis of key metabolites, including amino acids and organic acids, under different feeding strategies (e.g., bolus medium addition).

Main Results:

• HSD cultivations exhibited high glycolytic fluxes, asparagine depletion, and a shift from lactate production to consumption.
• Addition of a bolus medium (BM) enriched with asparagine improved final mAb titers.
• Elevated asparagine concentrations in the feed hindered the beneficial lactate shift, indicating a metabolic trade-off.

Conclusions:

• Optimizing asparagine availability is critical for maximizing mAb production titers in HSD CHO cell cultures.
• A balance must be struck between supplementing asparagine to overcome limitations and maintaining metabolic shifts for optimal cell performance.
• Metabolic network analysis provides valuable insights for refining feeding strategies in biopharmaceutical manufacturing.