Journal
JOURNAL OF PHARMACEUTICAL SCIENCES
Volume 108, Issue 3, Pages 1236-1245Publisher
ELSEVIER SCIENCE INC
DOI: 10.1016/j.xphs.2018.10.039
Keywords
antibody-drug conjugate(s) (ADC); stability; oxidation(s); protein aggregation; conjugation; protein formulation(s); HPLC (high-performance/pressure liquid chromatography); thermal analysis
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Oxidation of biopharmaceutics represents a major degradation pathway, which may impact bioactivity, serum half-life, and colloidal stability. This study focused on the quantification of oxidation and its effects on structure and colloidal stability for a model antibody and its lysine (ADC-L) and cysteine (ADC-C) conjugates. The effects of oxidation were evaluated by a forced degradation study using H2O2 and a shelf-life simulation, which used degrading polysorbate 80 as source for reactive oxygen species. Differential scanning fluorimetry revealed decreasing transition temperatures of the CH2 domain with rising oxidation, resulting in a loss of colloidal stability as assessed by size-exclusion high pressure liquid chromatography. The conjugation technique influences structural changes of the monoclonal antibody (mAb) and subsequently alters the impact of oxidation. ADC-C was most effected by oxidation as the CH2 domain showed the biggest destabilization on conjugation compared to the mAb and ADC-L. Quantification of Fc methionine oxidation by analytical protein A chromatography revealed 4-fold higher oxidation after 8 weeks for the ADC-C compared to the mAb. Payload degradation was observed independently of the conjugation technique used or if free in solution by ultraviolet-visible. In addition, adding antioxidants can be a suitable approach to prevent oxidation and achieve baseline stabilization of the proteins. (c) 2019 American Pharmacists Association (R). Published by Elsevier Inc. All rights reserved.
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