title: A CTL-based liposomal vaccine capable of inducing protection against heterosubtypic influenza viruses in HLA-A*0201 transgenic mice.
abstract: The current vaccination strategy against influenza is to induce the production of antibodies directed against surface antigens of viruses. However, the frequent changes in the surface antigens of influenza viruses allow the viruses to avoid antibody-mediated immunity. On the other hand, it is known that cytotoxic T-lymphocyte (CTL) populations directed against internal antigens of influenza A virus are broadly cross-reactive to influenza virus subtypes. In the present study, liposomal conjugates with CTL epitope peptides derived from highly conserved internal antigens of influenza viruses were evaluated for their ability to protect against infection with influenza viruses. Liposomal conjugates with peptide M1 58-66, an HLA-A*0201-binding CTL epitope present within the amino-acid sequence of the M1 coding region, successfully induced antigen-specific CD8(+) T-cells and CTLs in HLA-A*0201-transgenic mice. Moreover, after nasal infection with either the H1N1 or H3N2 virus, viral replication in the lung was significantly inhibited in the immunized mice. These protective activities lasted at least 6months after the immunization. Thus, these results suggest that liposome-coupled CTL epitope peptides derived from highly conserved internal antigens of influenza viruses might be applicable to the development of vaccines that induce protection against infection with heterosubtypic influenza viruses.
authors.affiliation: Department of Microbiology, Faculty of Medicine, Saitama Medical University, Saitama, Japan.
authors.forename: Masanori
authors.initials: M
authors.lastname: Matsui
authors.forename: Shunsuke
authors.initials: S
authors.lastname: Kohyama
authors.forename: Tatsuya
authors.initials: T
authors.lastname: Suda
authors.forename: Shoichi
authors.initials: S
authors.lastname: Yokoyama
authors.forename: Masahito
authors.initials: M
authors.lastname: Mori
authors.forename: Akiharu
authors.initials: A
authors.lastname: Kobayashi
authors.forename: Maiko
authors.initials: M
authors.lastname: Taneichi
authors.forename: Tetsuya
authors.initials: T
authors.lastname: Uchida
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D018984:Epitopes, T-Lymphocyte / Q000008:administration & dosage / Q000276:immunology*; D015234:HLA-A Antigens / Q000235:genetics; D015789:HLA-A2 Antigen; D006801:Humans; D053118:Influenza A Virus, H1N1 Subtype / Q000276:immunology*; D053122:Influenza A Virus, H3N2 Subtype / Q000276:immunology*; D053124:Influenza A Virus, H5N1 Subtype / Q000276:immunology*; D007252:Influenza Vaccines / Q000008:administration & dosage / Q000276:immunology*; D007251:Influenza, Human / Q000276:immunology / Q000517:prevention & control* / Q000821:virology; D008081:Liposomes; D051379:Mice; D008822:Mice, Transgenic; D010446:Peptide Fragments / Q000008:administration & dosage / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*
chemical_list: D018984:Epitopes, T-Lymphocyte; D015234:HLA-A Antigens; C435939:HLA-A*02:01 antigen; D015789:HLA-A2 Antigen; D007252:Influenza Vaccines; D008081:Liposomes; D010446:Peptide Fragments