title: Chimeric peptides: a new approach to enhancing the immunogenicity of peptides with low MHC class I affinity: application in antiviral vaccination.
abstract: Recruitment of the CTL repertoire specific for subdominant epitopes that have a low MHC class I-binding affinity could be the way to achieve an efficient protective immunity against spontaneous tumors and viruses with high mutation rate. However, we have reported recently that subdominant peptides of influenza A Puerto Rico/8/34 (flu PR8) nucleoprotein (NP) with low Db affinity are only partially able to protect mice against lethal influenza infection. This seems to be due to their inability to recruit the specific CTL repertoire, and suggests that subdominant peptides could be used for vaccination only if they become highly immunogenic. In this work, we describe an approach that allows enhancement of the immunogenicity of every low affinity peptide presented by the Db molecule. It consists in producing chimeric peptides composed by amino acids from a high Db affinity peptide (NP366) in positions that interact with the MHC, and amino acids from low Db affinity nonimmunogenic influenza NP-derived peptides (NP17, NP97, NP330, and NP469) in positions that are exposed to the TCR. All chimeric peptides tested exhibited a high Db affinity and efficiently recruited the CTL repertoire specific for the corresponding low Db affinity peptide. Furthermore, vaccination with chimeric peptides that corresponded to subdominant NP17 and NP97 peptides induced a very potent anti-flu PR8 protective immunity.
authors.affiliation: INSERM Unité 267, Immunogénetique des Allogreffes, Villejuif, France.
authors.forename: S
authors.initials: S
authors.lastname: Tourdot
authors.forename: M
authors.initials: M
authors.lastname: Oukka
authors.forename: J C
authors.initials: JC
authors.lastname: Manuguerra
authors.forename: V
authors.initials: V
authors.lastname: Magafa
authors.forename: I
authors.initials: I
authors.lastname: Vergnon
authors.forename: N
authors.initials: N
authors.lastname: Riché
authors.forename: M
authors.initials: M
authors.lastname: Bruley-Rosset
authors.forename: P
authors.initials: P
authors.lastname: Cordopatis
authors.forename: K
authors.initials: K
authors.lastname: Kosmatopoulos
mesh_terms: D000071181:ATP Binding Cassette Transporter, Subfamily B, Member 2; D000071450:ATP Binding Cassette Transporter, Subfamily B, Member 3; D018528:ATP-Binding Cassette Transporters / Q000235:genetics / Q000502:physiology; D000818:Animals; D003602:Cytotoxicity, Immunologic; D009980:Influenza A virus / Q000276:immunology* / Q000502:physiology; D007252:Influenza Vaccines / Q000737:chemistry / Q000276:immunology*; D016399:Lymphoma, T-Cell / Q000473:pathology; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009363:Neoplasm Proteins / Q000235:genetics / Q000502:physiology; D019590:Nucleocapsid Proteins; D009698:Nucleoproteins; D009976:Orthomyxoviridae Infections / Q000276:immunology / Q000517:prevention & control; D010446:Peptide Fragments / Q000276:immunology*; D011948:Receptors, Antigen, T-Cell / Q000276:immunology; D011993:Recombinant Fusion Proteins / Q000276:immunology*; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D014407:Tumor Cells, Cultured; D014614:Vaccines, Synthetic / Q000737:chemistry / Q000276:immunology; D014758:Viral Core Proteins / Q000276:immunology*; D014765:Viral Vaccines / Q000276:immunology*
chemical_list: D000071181:ATP Binding Cassette Transporter, Subfamily B, Member 2; D000071450:ATP Binding Cassette Transporter, Subfamily B, Member 3; D018528:ATP-Binding Cassette Transporters; D007252:Influenza Vaccines; D009363:Neoplasm Proteins; D019590:Nucleocapsid Proteins; D009698:Nucleoproteins; D010446:Peptide Fragments; D011948:Receptors, Antigen, T-Cell; D011993:Recombinant Fusion Proteins; C073119:TAP1 protein, human; C486171:Tap1 protein, mouse; C489516:Tap2 protein, mouse; D014614:Vaccines, Synthetic; D014758:Viral Core Proteins; D014765:Viral Vaccines; C071692:TAP2 protein, human