Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
2484656 | Journal of Pharmaceutical Sciences | 2014 | 12 Pages |
Abstract
The presence of micron aggregates in protein formulations has recently attracted increased interest from regulatory authorities, industry, and academia because of the potential undesired side effects of their presence. In this study, we characterized the micron aggregate formation of hen eggâwhite lysozyme (Lyz) and its diPEGylated (5 kDa) analog as a result of typical handling stress conditions. Both proteins were subjected to mechanical stress in the absence and presence of silicone oil (SO), elevated temperatures, and freeze-thaw cycles. Flow imaging microscopy showed that PEGylated Lyz formed approximately half as many particles as Lyz, despite its lower apparent thermodynamic stability and more loose protein fold. Further characterization showed that the PEGylation led to a change from attractive to repulsive protein-protein interactions, which may partly explain the reduced particle formation. Surprisingly, the PEGylated Lyz adsorbed an order of magnitude faster onto SO, despite being much larger in size, as determined by smallâangle Xâray scattering and dynamic light scattering measurements. Thus, PEGylation may significantly reduce, but not prevent, micron aggregate formation of a protein during typical handling stresses. © 2014 Wiley Periodicals, Inc. and the American Pharmacists Association J Pharm Sci 103:3043-3054, 2014
Keywords
Related Topics
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Pharmacology, Toxicology and Pharmaceutical Science
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Authors
Louise Stenstrup Holm, Aaron Mcumber, Jakob Ewald Rasmussen, Marc ObiolsâRabasa, Peter W. Thulstrup, Marina R. Kasimova, Theodore W. Randolph, Marco van de Weert,