N-glycosylation as novel strategy to improve pharmacokinetic properties of bispecific single-chain diabodies

The Journal of Biological Chemistry
Roland StorkRoland E Kontermann

Abstract

The therapeutic efficacy of recombinant antibodies such as single-chain Fv fragments and small bispecific or bifunctional molecules is often limited by rapid elimination from the circulation because of their small size. Here, we have investigated the effects of N-glycosylation on the activity and pharmacokinetics of a small bispecific single-chain diabody (scDb CEACD3) developed for the retargeting of cytotoxic T cells to CEA-expressing tumor cells. We could show that the introduction of N-glycosylation sequons into the flanking linker and a C-terminal extension results in the production of N-glycosylated molecules after expression in transfected HEK293 cells. N-Glycosylated scDb variants possessing 3, 6, or 9 N-glycosylation sites, respectively, retained antigen binding activity and bispecificity for target and effector cells as shown in a target cell-dependent IL-2 release assay, although activity was reduced approximately 3-5-fold compared with the unmodified scDb. All N-glycosylated scDb variants exhibited a prolonged circulation time compared with scDb, leading to a 2-3-fold increase of the area under curve (AUC). In comparison, conjugation of a branched 40-kDa PEG chain increased AUC by a factor of 10.6, while a chimeric ...Continue Reading

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Citations

Jan 19, 2013·BioDrugs : Clinical Immunotherapeutics, Biopharmaceuticals and Gene Therapy·Philippe Fournier, Volker Schirrmacher
Jul 25, 2009·The Journal of Biological Chemistry·Roland StorkRoland E Kontermann
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