title: Secondary replicative function of CD8+ T cells that had developed an effector phenotype.
abstract: Models of the differentiation of memory CD8+ T cells that replicate during secondary infections differ over whether such cells had acquired effector function during primary infections. We created a transgenic mouse line that permits mapping of the fate of granzyme B (gzmB)-expressing CD8+ T cells and their progeny by indelibly marking them with enhanced yellow fluorescent protein (EYFP). Virus-specific CD8+ T cells express gzmB within the first 2 days of a primary response to infection with influenza, without impairment of continued primary clonal expansion. On secondary infection, virus-specific CD8+ T cells that became EYFP+ during a primary infection clonally expand as well as all virus-specific CD8+ T cells. Thus, CD8+ T cells that have acquired an effector phenotype during primary infection may function as memory cells with replicative function.
authors.affiliation: Wellcome Trust Immunology Unit, Department of Medicine, University of Cambridge, Medical Research Council Centre, Hills Road, Cambridge CB2 2QH, UK.
authors.forename: Oliver
authors.initials: O
authors.lastname: Bannard
authors.forename: Matthew
authors.initials: M
authors.lastname: Kraman
authors.forename: Douglas T
authors.initials: DT
authors.lastname: Fearon
mesh_terms: D000818:Animals; D018414:CD8-Positive T-Lymphocytes / Q000166:cytology* / Q000276:immunology*; D002454:Cell Differentiation; D002455:Cell Division; D053804:Granzymes / Q000235:genetics / Q000378:metabolism; D007156:Immunologic Memory; D053118:Influenza A Virus, H1N1 Subtype / Q000276:immunology; D053122:Influenza A Virus, H3N2 Subtype / Q000276:immunology; D008164:Luminescent Proteins / Q000235:genetics / Q000378:metabolism; D008168:Lung / Q000276:immunology; D051379:Mice; D008822:Mice, Transgenic; D009976:Orthomyxoviridae Infections / Q000276:immunology*; D010641:Phenotype; D013154:Spleen / Q000276:immunology; D016176:T-Lymphocyte Subsets / Q000166:cytology / Q000276:immunology
chemical_list: D008164:Luminescent Proteins; D053804:Granzymes