title: Lymphopenic mice reconstituted with limited repertoire T cells develop severe, multiorgan, Th2-associated inflammatory disease.
abstract: Lymphopenia and restricted T cell repertoires in humans are often associated with severe eosinophilic disease and a T cell Th2 bias. To examine the pathogenesis of this phenomenon, C57BL/6 Rag2-/- mice received limited (3 x 10(4)) or large (2 x 10(6)) numbers of CD4 T cells. Three to 5 months after transfer, mice that had received 3 x 10(4) T cells, but not those that received 2 x 10(6), developed fulminant macrophage pneumonia with eosinophilia, Ym1 deposition, and methacholine-induced airway hyperresponsiveness, as well as eosinophilic gastritis; esophagitis and other organ damage occurred in some cases. Donor cells were enriched for IL-4, IL-5, and IL-13 producers. When 3 x 10(4) cells were transferred into CD3epsilon-/- hosts, the mice developed strikingly elevated serum IgE. Prior transfer of 3 x 10(5) CD25+ CD4 T cells into Rag2-/- recipients prevented disease upon subsequent transfer of CD25- CD4 T cells, whereas 3 x 10(4) regulatory T cells (Tregs) did not, despite the fact that there were equal total numbers of Tregs in the host at the time of transfer of CD25- CD4 T cells. Limited repertoire complexity of Tregs may lead to a failure to control induction of immunopathologic responses, and limitation in repertoire complexity of conventional cells may be responsible for the Th2 phenotype.
authors.affiliation: Laboratory of Immunology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.
authors.forename: Joshua D
authors.initials: JD
authors.lastname: Milner
authors.forename: Jerrold M
authors.initials: JM
authors.lastname: Ward
authors.forename: Andrea
authors.initials: A
authors.lastname: Keane-Myers
authors.forename: William E
authors.initials: WE
authors.lastname: Paul
mesh_terms: D019264:Adoptive Transfer; D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology / Q000637:transplantation; D004268:DNA-Binding Proteins / Q000172:deficiency / Q000235:genetics; D007073:Immunoglobulin E / Q000097:blood; D007249:Inflammation / Q000209:etiology* / Q000276:immunology / Q000473:pathology; D008231:Lymphopenia / Q000150:complications / Q000276:immunology* / Q000628:therapy; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D008822:Mice, Transgenic; D010641:Phenotype; D050378:T-Lymphocytes, Regulatory / Q000276:immunology; D018418:Th2 Cells / Q000276:immunology*
chemical_list: D004268:DNA-Binding Proteins; C499308:Rag2 protein, mouse; D007073:Immunoglobulin E