Acid-degradable particles for protein-based vaccines: Enhanced survival rate for tumor-challenged mice using ovalbumin model

Stephany M. Standley, Young Jik Kwon, Niren Murthy, Jun Kunisawa, Nilabh Shastri, Steven J. Guillaudeu, Lana Lau, Jean Frechet*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

76 Scopus citations


Acid-degradable protein-loaded polymer particles show promise for antigen-based vaccines due to their ability to activate cytotoxic T lymphocytes (CTLs) in vitro. Protein loadings and cytotoxic T lymphocyte activation efficiencies have now been enhanced through novel delivery vehicle designs. In particular, the use of a more hydrophilic acid-degradable cross-linker leads to increased water dispersibility and increased protein loading efficiency for the particles. A 2.5-fold increase in protein encapsulation allows the delivery of more protein antigen to antigen presenting cells (APCs) leading to a 20-fold rise in antigen presentation levels. The mechanism by which APCs internalize these particles was explored using the phagocytosis inhibitor, cytochalasin B. In addition, preliminary in vivo experiments were conducted to investigate the ability of the protein-loaded particles to provide immunity against tumors in mice, and an enhanced survival rate over the use of protein alone was observed, indicating that this vaccine delivery strategy has great practical potential.

Original languageEnglish (US)
Pages (from-to)1281-1288
Number of pages8
JournalBioconjugate Chemistry
Issue number6
StatePublished - Nov 1 2004

ASJC Scopus subject areas

  • Biotechnology
  • Bioengineering
  • Biomedical Engineering
  • Pharmacology
  • Pharmaceutical Science
  • Organic Chemistry

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