title: Cytokine-mediated programmed proliferation of virus-specific CD8(+) memory T cells.
abstract: During infection, CD8(+) T cells not only respond to antigenic signals through their T cell receptor (TCR) but also incorporate inflammatory signals from cytokines produced in the local infected microenvironment. Transient TCR-mediated stimulation will result in programmed proliferation that continues despite removal of the antigenic stimulus, but it remains unclear whether brief exposure to specific cytokines will elicit similar effects. Here, we have demonstrated that brief stimulation of memory T cells with interleukin-12 (IL-12) and interleukin-18 (IL-18) results in tightly regulated programmed proliferation, in addition to acquisition of enhanced virus-specific cytokine production and cytolytic activity. CD8(+) T cells briefly exposed to IL-12 and IL-18 in vitro showed improved antiviral activity in vivo, as demonstrated by increased proliferation and reduced viremia. These results indicate that even transitory exposure to inflammatory cytokines can provide a selective advantage to infiltrating CD8(+) T cells by triggering a developmental program that is initiated prior to direct contact with virus-infected cells.
authors.affiliation: Oregon National Primate Research Center, Oregon Health & Science University, 505 NW 185th Avenue, Beaverton, OR 97006, USA.
authors.forename: Hans-Peter
authors.initials: HP
authors.lastname: Raué
authors.forename: Carol
authors.initials: C
authors.lastname: Beadling
authors.forename: Jennifer
authors.initials: J
authors.lastname: Haun
authors.forename: Mark K
authors.initials: MK
authors.lastname: Slifka
mesh_terms: D000818:Animals; D000956:Antigens, Viral / Q000276:immunology*; D018414:CD8-Positive T-Lymphocytes / Q000166:cytology / Q000187:drug effects / Q000276:immunology*; D002454:Cell Differentiation / Q000187:drug effects / Q000276:immunology; D016207:Cytokines / Q000276:immunology* / Q000494:pharmacology; D018984:Epitopes, T-Lymphocyte / Q000276:immunology*; D007156:Immunologic Memory; D020382:Interleukin-18 / Q000276:immunology / Q000494:pharmacology; D008213:Lymphocyte Activation / Q000187:drug effects / Q000276:immunology*; D008217:Lymphocytic choriomeningitis virus / Q000276:immunology; D051379:Mice; D010455:Peptides / Q000276:immunology; D013602:T-Lymphocytes, Cytotoxic / Q000166:cytology / Q000187:drug effects / Q000276:immunology; D014780:Viruses / Q000276:immunology*
chemical_list: D000956:Antigens, Viral; D016207:Cytokines; D018984:Epitopes, T-Lymphocyte; D020382:Interleukin-18; D010455:Peptides