title: Concurrent naive and memory CD8(+) T cell responses to an influenza A virus.
abstract: Memory Thy-1(+)CD8(+) T cells specific for the influenza A virus nucleoprotein (NP(366-374)) peptide were sorted after staining with the D(b)NP(366) tetramer, labeled with CFSE, and transferred into normal Thy-1.2(+) recipients. The donor D(b)NP(366)(+) T cells recovered 2 days later from the spleens of the Thy-1.2(+) hosts showed the CD62L(low)CD44(high)CD69(low) phenotype, characteristic of the population analyzed before transfer, and were present at frequencies equivalent to those detected previously in mice primed once by a single exposure to an influenza A virus. Analysis of CFSE-staining profiles established that resting tetramer(+) T cells divided slowly over the next 30 days, while the numbers in the spleen decreased about 3-fold. Intranasal infection shortly after cell transfer with a noncross-reactive influenza B virus induced some of the donor D(b)NP(366)(+) T cells to cycle, but there was no increase in the total number of transferred cells. By contrast, comparable challenge with an influenza A virus caused substantial clonal expansion, and loss of the CFSE label. Unexpectedly, the recruitment of naive Thy-1.2(+)CD8(+)D(b)NP(366)(+) host D(b)NP(366)(+) T cells following influenza A challenge was not obviously diminished by the presence of the memory Thy-1.1(+)CD8(+)D(b)NP(366)(+) donor D(b)NP(366)(+) set. Furthermore, the splenic response to an epitope (D(b)PA(224)) derived from the influenza acid polymerase (PA(224-233)) was significantly enhanced in the mice given the donor D(b)NP(366)(+) memory population. These experiments indicate that an apparent recall response may be comprised of both naive and memory CD8(+) T cells.
authors.affiliation: Department of Immunology, St. Jude Children's Research Hospital, Memphis, TN 38105, USA.
authors.forename: S J
authors.initials: SJ
authors.lastname: Turner
authors.forename: R
authors.initials: R
authors.lastname: Cross
authors.forename: W
authors.initials: W
authors.lastname: Xie
authors.forename: P C
authors.initials: PC
authors.lastname: Doherty
mesh_terms: D000818:Animals; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000637:transplantation; D005260:Female; D007156:Immunologic Memory; D009980:Influenza A virus / Q000276:immunology*; D009981:Influenza B virus / Q000276:immunology; D008168:Lung / Q000276:immunology / Q000821:virology; D051379:Mice; D020297:Mice, Congenic; D019590:Nucleocapsid Proteins; D009698:Nucleoproteins / Q000276:immunology; D009976:Orthomyxoviridae Infections / Q000276:immunology / Q000821:virology; D010446:Peptide Fragments / Q000276:immunology; D010641:Phenotype; D016601:RNA-Binding Proteins; D014758:Viral Core Proteins / Q000276:immunology
chemical_list: C048842:NP protein, Influenza A virus; D019590:Nucleocapsid Proteins; D009698:Nucleoproteins; D010446:Peptide Fragments; D016601:RNA-Binding Proteins; D014758:Viral Core Proteins