title: Stimulation history dictates memory CD8 T cell phenotype: implications for prime-boost vaccination.
abstract: Heterologous prime-boost vaccination results in increased frequencies of memory T cells. Although these quantitative effects of reexposure to Ag are well documented, little is known about the impact of boosting on the functional qualities of memory T cells. To address this critical issue, we have used three different types of immunization regimens and examined how boosting effects the function and anatomic location of memory CD8 T cells. We found that memory T cell phenotype differed substantially depending on the number of immunizations and that secondary and tertiary responses resulted in the generation of memory CD8 T cells that retained effector-like properties and showed preferential accumulation in nonlymphoid tissues. These results show that memory differentiation is coupled to the history of Ag experience and that prime-boost vaccination strategies have important consequences on memory CD8 T cell quality and surveillance within mucosal tissues.
authors.affiliation: Emory Vaccine Center and Department of Microbiology and Immunology, Emory University School of Medicine, 1510 Clifton Road, Atlanta, GA 30322, USA. masopust@microbio.emory.edu
authors.forename: David
authors.initials: D
authors.lastname: Masopust
authors.forename: Sang-Jun
authors.initials: SJ
authors.lastname: Ha
authors.forename: Vaiva
authors.initials: V
authors.lastname: Vezys
authors.forename: Rafi
authors.initials: R
authors.lastname: Ahmed
mesh_terms: D000818:Animals; D018414:CD8-Positive T-Lymphocytes / Q000145:classification / Q000276:immunology* / Q000378:metabolism*; D049109:Cell Proliferation; D016207:Cytokines / Q000096:biosynthesis; D003602:Cytotoxicity, Immunologic / Q000235:genetics; D007117:Immunization, Secondary; D007156:Immunologic Memory / Q000235:genetics; D016130:Immunophenotyping; D018655:Lymphocyte Count; D051379:Mice; D008810:Mice, Inbred C57BL; D008822:Mice, Transgenic / Q000821:virology; D016176:T-Lymphocyte Subsets / Q000276:immunology / Q000378:metabolism / Q000821:virology; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology / Q000378:metabolism / Q000821:virology; D019444:Vaccines, DNA / Q000008:administration & dosage / Q000276:immunology; D014721:Vesicular stomatitis Indiana virus / Q000276:immunology*; D014765:Viral Vaccines / Q000008:administration & dosage* / Q000276:immunology*
chemical_list: D016207:Cytokines; D019444:Vaccines, DNA; D014765:Viral Vaccines