title: Phenotypic and functional analysis of LCMV gp33-41-specific CD8 T cells elicited by multiple peptide immunization in mice revealed the up-regulation of PD-1 expression on antigen-specific CD8 T cells.
abstract: The phenotype and function of antigen-specific CD8 T cells are closely associated with the efficacy of a therapeutic vaccination. Here we showed that multiple immunizations with LCMV gp33-41 peptide (KAV) in Freund's adjuvant could induce KAV-specific CD8 T cells with low expression of CD127 and CD62L molecules. The inhibitory receptor PD-1 was also expressed on a substantial part of KAV-specific CD8 T cells, and its expression level on KAV-specific CD8 T cells in spleen and lymph nodes was much higher when compared to those in peripheral blood. Furthermore, KAV-specific CD8 T cells could specifically kill KAV-pulsed target cells in vivo but the efficiency was low. These data suggest that prime-boost vaccination schedule with peptide in Freund's adjuvant can elicit antigen-specific CD8 T cells of effector-like phenotype with partial functional exhaustion, which may only provide short-term protection against the pathogen.
authors.affiliation: Institute of Dermatology, Chinese Academy of Medical Sciences & Peking Union Medical College, Nanjing 210042, China.
authors.forename: Yi
authors.initials: Y
authors.lastname: Liu
authors.forename: Lihui
authors.initials: L
authors.lastname: Xu
authors.forename: Yiqun
authors.initials: Y
authors.lastname: Jiang
authors.forename: Jianfang
authors.initials: J
authors.lastname: Sun
authors.forename: Xianhui
authors.initials: X
authors.lastname: He
mesh_terms: D000276:Adjuvants, Immunologic; D000818:Animals; D000956:Antigens, Viral / Q000276:immunology; D001117:Arenaviridae Infections / Q000517:prevention & control; D016827:CD8 Antigens; D003602:Cytotoxicity, Immunologic / Q000235:genetics; D018984:Epitopes, T-Lymphocyte / Q000276:immunology / Q000378:metabolism; D005260:Female; D005786:Gene Expression Regulation / Q000276:immunology*; D007117:Immunization, Secondary / Q000379:methods*; D016130:Immunophenotyping; D053699:Interleukin-7 Receptor alpha Subunit / Q000276:immunology; D019041:L-Selectin / Q000276:immunology; D008217:Lymphocytic choriomeningitis virus / Q000235:genetics / Q000276:immunology / Q000378:metabolism; D051379:Mice; D008810:Mice, Inbred C57BL; D061026:Programmed Cell Death 1 Receptor; D011971:Receptors, Immunologic / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology*; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology / Q000378:metabolism; D022223:Vaccines, Subunit
chemical_list: D000276:Adjuvants, Immunologic; D000956:Antigens, Viral; D016827:CD8 Antigens; D018984:Epitopes, T-Lymphocyte; D053699:Interleukin-7 Receptor alpha Subunit; C491383:Pdcd1 protein, mouse; D061026:Programmed Cell Death 1 Receptor; D011971:Receptors, Immunologic; D022223:Vaccines, Subunit; D019041:L-Selectin