Strategies to Control Therapeutic Antibody Glycosylation during Bioprocessing: Synthesis and Separation
Glycosylation can be a critical quality attribute (CQA) in biologic manufacturing. In particular, it has implications on the half?life, immunogenicity and pharmacokinetics of therapeutic monoclonal antibodies (mAbs) and must be closely monitored throughout drug development and manufacturing. To address this, advances have been made primarily in upstream processing, including mammalian cell line engineering to yield more predictably glycosylated mAbs, and the addition of media supplements during fermentation to manipulate the metabolic pathways involved in glycosylation. A more robust approach would be a conjoined upstream?downstream processing strategy. This could include implementing novel downstream technologies, such as the use of Fc gamma?based affinity ligands for the separation of mAb glycovariants. This review highlights the importance of controlling therapeutic antibody glycosylation patterns, the challenges faced in terms of glycosylation during mAb biosimilar development, current efforts both upstream and downstream to control glycosylation and their limitations, and the need for research in the downstream space in order to establish holistic and consistent manufacturing processes for the production of antibody therapies.This article is protected by copyright. All rights reserved.