title: T-cell activation and differentiation are regulated by TNF during murine DBA/2-->B6D2F1 intestinal graft-versus-host disease.
abstract: Administration of a tumor necrosis factor (TNF) inhibitor-encoding adenoviral vector decreases the severity of colonic inflammation in a DBA/2-->B6D2F1 murine model of colonic graft-versus-host disease (GVHD). The present studies evaluated the effect of TNF blockade on the splenic and colonic T-cell responses. cDNA encoding an artificial fusion protein consisting of the extracellular domain of the human 55-kDa receptor for TNF fused to a mouse IgG heavy chain was subcloned into an E1a-deficient adenoviral vector. Following transfer of DBA/2 T cells and bone marrow cells into irradiated B6D2F1 mice, the mice then received either the control adenovirus or the TNF inhibitor-encoding adenovirus. Splenic and colonic lymphocytes were isolated, stained with anti-H-2b, anti-H-2d, anti-CD3, anti-CD4, anti-CD8, and anti-CD45RB antibodies, and analyzed by flow cytometry. Splenic and colonic lymphocyte cytokine profiles also were assessed. More colonic T cells of donor origin were isolated from the control adenovirus recipients than from recipients of the TNF inhibitor encoding adenovirus (P = .027). Fewer CD4+ and CD8+ T cells were observed in colon but not in the spleen in the TNF inhibitor recipients. Fewer CD45RBlow (memory) T cells were observed in the CD4+ colonic lymphocytes isolated from the TNF inhibitor recipients than from controls. Importantly, lower levels of interleukin-2(IL-2) and interferon-gamma (INF-gamma) but not of IL-4 were observed in the lamina propria lymphocyte RNA isolated from the TNF inhibitor recipients. Infiltration and expansion of donor T cells and T-cell activation in the colon appear to be regulated by TNF during murine DBA/2 --> B6D2F1 gut GVHD.
authors.affiliation: Department of Internal Medicine, University of Texas Southwestern Medical Center at Dallas, 75390-9151, USA.
authors.forename: G R
authors.initials: GR
authors.lastname: Brown
authors.forename: D L
authors.initials: DL
authors.lastname: Thiele
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D002454:Cell Differentiation; D003001:Cloning, Molecular; D003106:Colon / Q000276:immunology*; D006086:Graft vs Host Disease / Q000276:immunology*; D007371:Interferon-gamma / Q000378:metabolism; D007376:Interleukin-2 / Q000378:metabolism; D007413:Intestinal Mucosa / Q000276:immunology; D008213:Lymphocyte Activation; D018655:Lymphocyte Count; D051379:Mice; D008811:Mice, Inbred DBA; D013154:Spleen / Q000166:cytology / Q000276:immunology; D016176:T-Lymphocyte Subsets / Q000276:immunology; D013601:T-Lymphocytes / Q000166:cytology / Q000276:immunology* / Q000378:metabolism / Q000637:transplantation; D014409:Tumor Necrosis Factor-alpha / Q000037:antagonists & inhibitors / Q000502:physiology*
chemical_list: D007376:Interleukin-2; D014409:Tumor Necrosis Factor-alpha; D007371:Interferon-gamma