Design of fully synthetic, self-adjuvanting vaccine incorporating the tumor-associated carbohydrate Tn antigen and lipoamino acid-based Toll-like receptor 2 ligand

J Med Chem. 2012 Aug 9;55(15):6968-74. doi: 10.1021/jm300822g. Epub 2012 Jul 25.

Abstract

Overexpression of certain tumor-associated carbohydrate antigens (TACA) caused by malignant transformation offers promising targets to develop novel antitumor vaccines, provided the ability to break their inherent low immunogenicity and overcome the tolerance of the immune system. We designed, synthesized, and immunologically evaluated a number of fully synthetic new chimeric constructs incorporating a cluster of the most common TACA (known as Tn antigen) covalently attached to T-cell peptide epitopes derived from polio virus and ovalbumin and included a synthetic built-in adjuvant consisting of two 16-carbon lipoamino acids. Vaccine candidates were able to induce significantly strong antibody responses in mice without the need for any additional adjuvant, carrier protein, or special pharmaceutical preparation (e.g., liposomes). Vaccine constructs were assembled either in a linear or in a branched architecture, which demonstrated the intervening effects of the incorporation and arrangement of T-cell epitopes on antibody recognition.

MeSH terms

  • Adjuvants, Immunologic / chemistry*
  • Animals
  • Antigens, Tumor-Associated, Carbohydrate / chemistry*
  • Antigens, Tumor-Associated, Carbohydrate / immunology
  • Cancer Vaccines / chemical synthesis*
  • Cancer Vaccines / immunology
  • Epitopes, T-Lymphocyte
  • Female
  • Glycopeptides / chemistry*
  • Glycopeptides / immunology
  • HEK293 Cells
  • Humans
  • Ligands
  • Lipopeptides / chemistry*
  • Lipopeptides / immunology
  • Mice
  • Mice, Inbred BALB C
  • Toll-Like Receptor 2 / agonists*

Substances

  • Adjuvants, Immunologic
  • Antigens, Tumor-Associated, Carbohydrate
  • Cancer Vaccines
  • Epitopes, T-Lymphocyte
  • Glycopeptides
  • Ligands
  • Lipopeptides
  • Tn antigen
  • Toll-Like Receptor 2