title: CD8(+) T cells regulate immune responses in a murine model of allergen-induced sensitization and airway inflammation.
abstract: The role of CD8(+) T cells in the development of allergic airway disease is controversial. On the one hand, CD8(+) T cells are known to inhibit the development of airway hyperreactivity (AHR) in murine models of asthma. In humans, IL-10-producing CD8(+) T cells were shown to act as regulatory cells, inhibiting both proliferation and cytokine secretion of T cells. On the other hand, CD8(+) T cells can promote IL-5-mediated eosinophilic airway inflammation and the development of AHR in animal models. To examine this, we investigated the role of CD8(+) T cells during the induction of allergen-induced AHR and demonstrated a protective effect of CD8(+) T cells. Depletion of CD8(+) T cells prior to the immunization led to increased Th2 responses and increased allergic airway disease. However, after development of AHR, CD8(+) T cells that infiltrated the lungs secreted high levels of IL-4, IL-5 and IL-10, but little IFN-gamma, whereas CD8(+) T cells in the peribronchial lymph nodes or spleen produced high levels of IFN-gamma, but little or no Th2 cytokines. These data demonstrate protective effects of CD8(+)T cells against the induction of immune responses and show a functional diversity of CD8(+) T cells in different compartments of sensitized mice.
authors.affiliation: Department of Pediatrics, Stanford University, Stanford, CA 94305-5208, USA. pstock@stanford.edu
authors.forename: Philippe
authors.initials: P
authors.lastname: Stock
authors.forename: Tilmann
authors.initials: T
authors.lastname: Kallinich
authors.forename: Omid
authors.initials: O
authors.lastname: Akbari
authors.forename: David
authors.initials: D
authors.lastname: Quarcoo
authors.forename: Kerstin
authors.initials: K
authors.lastname: Gerhold
authors.forename: Ulrich
authors.initials: U
authors.lastname: Wahn
authors.forename: Dale T
authors.initials: DT
authors.lastname: Umetsu
authors.forename: Eckard
authors.initials: E
authors.lastname: Hamelmann
mesh_terms: D000485:Allergens / Q000276:immunology*; D000818:Animals; D000906:Antibodies / Q000097:blood / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D002478:Cells, Cultured; D004195:Disease Models, Animal; D005260:Female; D006967:Hypersensitivity / Q000276:immunology* / Q000503:physiopathology; D007249:Inflammation / Q000276:immunology / Q000503:physiopathology; D008168:Lung / Q000276:immunology* / Q000503:physiopathology; D051379:Mice; D008807:Mice, Inbred BALB C
chemical_list: D000485:Allergens; D000906:Antibodies