Abstract
Glycation of therapeutic proteins occurs during mammalian cell culture expression and upon administration to patients. Since the chemical attachment of mannose or other sugars via a chemical linker has been shown to increase a protein’s clearance rate in mice through the mannose receptor, we explored the effect of mannose glycation on the clearance of an IgG in mice. An IgG decorated with high levels of mannose (~18 mol/mol protein) through glycation did not clear faster in mice than the underivatized protein, whereas the same IgG decorated with mannose attached in a way to maintain the normal glycosidic bond (2-imino-2-methoxyethyl-1-thiomannoside, or IMT-mannose) at similar derivatization levels cleared significantly faster. Surface plasmon resonance studies revealed that the IgG derivatized with IMT-mannose bound tightly to the mannose receptor (KD = 20 nM) but the IgG glycated with mannose did not bind. These results indicate that glycation, even at unnaturally elevated levels, does not appear to be a clearance concern for therapeutic proteins.
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Abbreviations
- AUC:
-
area under the curve
- BSA:
-
bovine serum albumin
- CHO:
-
Chinese hamster ovary
- CRD:
-
carbohydrate recognition domain
- IMT:
-
2-imino-2-methoxyethyl-1-thio-
- LC:
-
liquid chromatography
- mAb:
-
monoclonal antibody
- MR:
-
mannose receptor
- MRT:
-
mean residence time
- MS:
-
mass spectrometry
- PK:
-
phamacokinetics
- RU:
-
resonance units
- SPR:
-
surface plasmon resonance
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Acknowledgments
We thank Guna Kannan, John McCarter, Andy Goetze, and Diana Liu for helpful discussions, Michael Shearer, Kiani Maryam, and Toung-vi Don for technical assistance and Fuat Doymaz for statistics advice.
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Yang, J., Primack, R., Frohn, M. et al. Impact of Glycation on Antibody Clearance. AAPS J 17, 237–244 (2015). https://doi.org/10.1208/s12248-014-9694-4
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DOI: https://doi.org/10.1208/s12248-014-9694-4