The Effect of Protein PEGylation on Physical Stability in Liquid Formulation

Louise Stenstrup Holm, Aaron Mcumber, Jakob Ewald Rasmussen, Marc Obiols-Rabasa, Peter W. Thulstrup, Marina R. Kasimova, Theodore W. Randolph, Marco van de Weert*

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

19 Citations (Scopus)

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 egg-white 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 small-angle X-ray scattering and dynamic light scattering measurements. Thus, PEGylation may significantly reduce, but not prevent, micron aggregate formation of a protein during typical handling stresses.

Original languageEnglish
JournalJournal of Pharmaceutical Sciences
Volume103
Issue number10
Pages (from-to)3043-3054
Number of pages11
ISSN0022-3549
DOIs
Publication statusPublished - 21 Aug 2014

Keywords

  • Calorimetry (DSC)
  • Circular dichroism
  • Light scattering
  • Microflow imaging
  • PEGylation
  • Physical stability
  • Protein aggregation
  • Proteins
  • Silicone oil
  • Small-angle X-ray scattering

Cite this