title: Rationale for antiangiogenic cancer therapy with vaccination using epitope peptides derived from human vascular endothelial growth factor receptor 2.
abstract: Angiogenesis is a critical mechanism for tumor progression. Multiple studies have suggested that tumor growth can be suppressed if tumor angiogenesis can be inhibited using various types of antiangiogenic agents. Recent studies in mouse systems have shown that tumor angiogenesis can also be inhibited if cellular immune response could be induced against vascular endothelial growth factor receptor 2 (VEGFR2), which is one of the key factors in tumor angiogenesis. In this study, we examined the possibility of developing this novel immunotherapy in clinical setting. We first identified the epitope peptides of VEGFR2 and showed that stimulation using these peptides induces CTLs with potent cytotoxicity in the HLA class I-restricted fashion against not only peptide-pulsed target cells but also endothelial cells endogenously expressing VEGFR2. In A2/Kb transgenic mice that express alpha1 and alpha2 domains of human HLA-A*0201, vaccination using these epitope peptides in vivo was associated with significant suppression of the tumor growth and prolongation of the animal survival without fatal adverse effects. In antiangiogenesis assay, tumor-induced angiogenesis was significantly suppressed with the vaccination using these epitope peptides. Furthermore, CTLs specific to the epitope peptides were successfully induced in cancer patients, and the specificities of the CTLs were confirmed using functional and HLA-tetramer analysis. These results in vitro and in vivo strongly suggest that the epitope peptides derived from VEGFR2 could be used as the agents for antiangiogenic immunotherapy against cancer in clinical settings.
authors.affiliation: Department of Surgery and Bioengineering, Advanced Clinical Research Center, Institute of Medical Science, University of Tokyo, Tokyo, Japan.
authors.forename: Satoshi
authors.initials: S
authors.lastname: Wada
authors.forename: Takuya
authors.initials: T
authors.lastname: Tsunoda
authors.forename: Toshiyuki
authors.initials: T
authors.lastname: Baba
authors.forename: F James
authors.initials: FJ
authors.lastname: Primus
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Kuwano
authors.forename: Masabumi
authors.initials: M
authors.lastname: Shibuya
authors.forename: Hideaki
authors.initials: H
authors.lastname: Tahara
mesh_terms: D000595:Amino Acid Sequence; D020533:Angiogenesis Inhibitors / Q000276:immunology*; D000818:Animals; D019496:Cancer Vaccines / Q000276:immunology*; D000939:Epitopes / Q000276:immunology; D015234:HLA-A Antigens / Q000276:immunology; D015789:HLA-A2 Antigen; D019073:HT29 Cells; D006801:Humans; D007963:Leukocytes, Mononuclear / Q000276:immunology; D008546:Melanoma, Experimental / Q000276:immunology / Q000628:therapy; D051379:Mice; D008822:Mice, Transgenic; D009842:Oligopeptides / Q000276:immunology; D010446:Peptide Fragments / Q000276:immunology*; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology; D040301:Vascular Endothelial Growth Factor Receptor-2 / Q000276:immunology*
chemical_list: D020533:Angiogenesis Inhibitors; D019496:Cancer Vaccines; D000939:Epitopes; D015234:HLA-A Antigens; C435939:HLA-A*02:01 antigen; D015789:HLA-A2 Antigen; D009842:Oligopeptides; D010446:Peptide Fragments; D040301:Vascular Endothelial Growth Factor Receptor-2