title: Acid-degradable particles for protein-based vaccines: enhanced survival rate for tumor-challenged mice using ovalbumin model.
abstract: 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.
authors.affiliation: Center for New Directions in Organic Synthesis and Departments of Chemistry and Molecular and Cellular Biology, University of California, Berkeley, California 94720-1460, USA.
authors.forename: Stephany M
authors.initials: SM
authors.lastname: Standley
authors.forename: Young Jik
authors.initials: YJ
authors.lastname: Kwon
authors.forename: Niren
authors.initials: N
authors.lastname: Murthy
authors.forename: Jun
authors.initials: J
authors.lastname: Kunisawa
authors.forename: Nilabh
authors.initials: N
authors.lastname: Shastri
authors.forename: Steven J
authors.initials: SJ
authors.lastname: Guillaudeu
authors.forename: Lana
authors.initials: L
authors.lastname: Lau
authors.forename: Jean M J
authors.initials: JM
authors.lastname: Fréchet
mesh_terms: D000818:Animals; D019496:Cancer Vaccines / Q000008:administration & dosage / Q000737:chemistry / Q000378:metabolism*; D003432:Cross-Linking Reagents / Q000008:administration & dosage / Q000737:chemistry / Q000378:metabolism*; D016503:Drug Delivery Systems / Q000379:methods*; D005260:Female; D006863:Hydrogen-Ion Concentration; D051379:Mice; D008810:Mice, Inbred C57BL; D010047:Ovalbumin / Q000008:administration & dosage / Q000378:metabolism*; D015996:Survival Rate
chemical_list: D019496:Cancer Vaccines; D003432:Cross-Linking Reagents; D010047:Ovalbumin