title: Memory CD8+ T cells in heterologous antiviral immunity and immunopathology in the lung.
abstract: A potent role for memory CD8+ T cells in heterologous immunity was shown with a respiratory mucosal model of viral infection. Memory CD8+ T cells generated after lymphocytic choriomeningitis virus (LCMV) infection were functionally activated in vivo to produce interferon-gamma (IFN-gamma) during acute infection with vaccinia virus (VV). Some of these antigen-specific memory cells selectively expanded in number, which resulted in modulation of the original LCMV-specific T cell repertoire. In addition, there was an organ-selective compartmental redistribution of these LCMV-specific T cells during VV infection. The presence of these LCMV-specific memory T cells correlated with enhanced VV clearance, decreased mortality and marked changes in lung immunopathology. Thus, the participation of pre-existing memory T cells specific to unrelated agents can alter the dynamics of mucosal immunity and disease course in response to a pathogen.
authors.affiliation: Department of Pathology, University of Massachusetts Medical School, Worcester, MA 01655, USA.
authors.forename: H D
authors.initials: HD
authors.lastname: Chen
authors.forename: A E
authors.initials: AE
authors.lastname: Fraire
authors.forename: I
authors.initials: I
authors.lastname: Joris
authors.forename: M A
authors.initials: MA
authors.lastname: Brehm
authors.forename: R M
authors.initials: RM
authors.lastname: Welsh
authors.forename: L K
authors.initials: LK
authors.lastname: Selin
mesh_terms: D000281:Administration, Intranasal; D000818:Animals; D000956:Antigens, Viral / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000145:classification / Q000276:immunology*; D002478:Cells, Cultured / Q000276:immunology / Q000378:metabolism; D016207:Cytokines / Q000096:biosynthesis; D006801:Humans; D007114:Immunization; D007156:Immunologic Memory; D007371:Interferon-gamma / Q000096:biosynthesis; D008168:Lung / Q000276:immunology / Q000473:pathology*; D008213:Lymphocyte Activation; D008216:Lymphocytic Choriomeningitis / Q000276:immunology* / Q000473:pathology / Q000821:virology; D008217:Lymphocytic choriomeningitis virus / Q000276:immunology* / Q000302:isolation & purification; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D009297:Nasal Mucosa / Q000276:immunology*; D009928:Organ Specificity; D012141:Respiratory Tract Infections / Q000276:immunology* / Q000473:pathology / Q000821:virology; D016176:T-Lymphocyte Subsets / Q000276:immunology*; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology; D014615:Vaccinia / Q000276:immunology* / Q000473:pathology / Q000821:virology; D014616:Vaccinia virus / Q000276:immunology* / Q000302:isolation & purification
chemical_list: D000956:Antigens, Viral; D016207:Cytokines; D007371:Interferon-gamma