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Overcoming PEG Antigenicity: Statistical PEG Isomers Reduce Antibody Binding.

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Randomized PEG (rPEG) reduces immune responses by disrupting antibody binding. This novel polymer prevents anti-PEG antibodies, offering a promising alternative for advanced biomedical applications.

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anti‐PEG antibodiescopolymerizationpoly(ethylene glycol)randomized PEGring‐opening polymerization

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Area of Science:

  • Polymer Chemistry
  • Immunology
  • Nanomedicine

Background:

  • Poly(ethylene glycol) (PEG) is crucial in bioconjugation and nanomedicine.
  • PEG exposure can trigger anti-PEG antibodies (APAs), leading to immune reactions and rapid clearance.
  • Developing PEG alternatives that evade immune recognition is essential.

Purpose of the Study:

  • To investigate the interaction between randomized PEG (rPEG) and anti-PEG antibodies (APAs).
  • To determine the efficacy of rPEG in preventing APA recognition and binding.
  • To establish rPEG as a viable alternative to conventional PEG for biomedical uses.

Main Methods:

  • Synthesis of rPEG via anionic ring-opening polymerization incorporating a glycidyl methyl ether comonomer.
  • Characterization of rPEG-APA interactions using microscale thermophoresis and fluorescence correlation spectroscopy.
  • Computational analysis using Monte Carlo simulations to assess PEG chain conformations.

Main Results:

  • Increasing comonomer content in rPEG significantly reduced APA binding.
  • rPEGs with 52 mol% comonomer effectively blocked APA interaction.
  • Simulations showed reduced consecutive ethylene glycol sequences, crucial for APA recognition.

Conclusions:

  • rPEG acts as a stealth polymer by hindering APA recognition.
  • rPEG demonstrates potential as a superior alternative to PEG in biomedical applications.
  • This work advances the development of biocompatible polymers with reduced immunogenicity.