A plant-derived human monoclonal antibody induces an anti-carbohydrate immune response in rabbits

Glycobiology
Chunsheng JinHerta Steinkellner

Abstract

A common argument against using plants as a production system for therapeutic proteins is their inability to perform authentic N-glycosylation. A major concern is the presence of beta 1,2-xylose and core alpha 1,3-fucose residues on complex N-glycans as these nonmammalian N-glycan residues may provoke unwanted side effects in humans. In this study we have investigated the potential antigenicity of plant-type N-glycans attached to a human monoclonal antibody (2G12). Using glyco-engineered plant lines as expression hosts, four 2G12 glycoforms differing in the presence/absence of beta 1,2-xylose and core alpha 1,3-fucose were generated. Systemic immunization of rabbits with a xylose and fucose carrying 2G12 glycoform resulted in a humoral immune response to both N-glycan epitopes. Furthermore, IgE immunoblotting with sera derived from allergic patients revealed binding to plant-produced 2G12 carrying core alpha 1,3 fucosylated N-glycan structures. Our results provide evidence for the adverse potential of nonmammalian N-glycan modifications present on monoclonal antibodies produced in plants. This emphasizes the need for the use of glyco-engineered plants lacking any potentially antigenic N-glycan structures for the production of p...Continue Reading

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