title: Both CD4+ and CD8+ T-cells in syngeneic islet grafts in NOD mice produce interferon-gamma during beta-cell destruction.
abstract: Syngeneic pancreatic islet grafts in diabetic NOD mice are infiltrated by mononuclear leukocytes, beta-cells are selectively destroyed, and autoimmune diabetes recurs. This model was used to identify islet graft-infiltrating mononuclear leukocytes associated with beta-cell destruction and diabetes recurrence. We compared cell surface antigen and cytokine-producing phenotypes of mononuclear leukocytes in islet grafts from NOD mice that were protected from diabetes recurrence by complete Freund's adjuvant (CFA) administration (beta-cell nondestructive insulitis) and in islet grafts from control phosphate-buffered saline (PBS)-injected NOD mice (beta-cell destructive insulitis). Islet grafts from CFA-injected mice contained fewer CD4+ and CD8+ cells and more B cells; also fewer interferon gamma (IFN-gamma), interleukin-2 (IL-2), and tumor necrosis factor alpha (TNF-alpha)-positive cells and more IL-4 and IL-10 positive cells. By performing two-color immunostaining of cell surface antigens and intracellular IFN-gamma, we found that IFN-gamma positive cells in islet grafts from CFA- and PBS-injected mice were approximately equally divided between CD4+ and CD8+ T-cell subsets. Also, the frequencies of both CD4+ IFN-gamma + and CD8+ IFN-gamma + cells were decreased in islet grafts from CFA-injected mice. These findings suggest that destruction of beta-cells in syngeneic islets transplanted into NOD mice is promoted by cells producing Th1-type cytokines (IFN-gamma, IL-2, and TNF-alpha) and prevented by cells producing TH2-type cytokines (IL-4 and IL-10). Furthermore, both CD4+ and CD8+ IFN-gamma-producing T-cells in the islet grafts appear to be involved in beta-cell destruction and diabetes recurrence.
authors.affiliation: Department of Medicine, University of Alberta, Edmonton, Canada.
authors.forename: W
authors.initials: W
authors.lastname: Suarez-Pinzon
authors.forename: R V
authors.initials: RV
authors.lastname: Rajotte
authors.forename: T R
authors.initials: TR
authors.lastname: Mosmann
authors.forename: A
authors.initials: A
authors.lastname: Rabinovitch
mesh_terms: D000818:Animals; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology* / Q000473:pathology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology* / Q000473:pathology; D016207:Cytokines / Q000032:analysis*; D003922:Diabetes Mellitus, Type 1 / Q000188:drug therapy / Q000276:immunology* / Q000601:surgery*; D005260:Female; D005434:Flow Cytometry; D007004:Hypoglycemic Agents / Q000627:therapeutic use; D007150:Immunohistochemistry; D049528:Insulin, Long-Acting / Q000627:therapeutic use; D007371:Interferon-gamma / Q000032:analysis / Q000096:biosynthesis*; D016753:Interleukin-10 / Q000032:analysis; D007376:Interleukin-2 / Q000032:analysis; D015847:Interleukin-4 / Q000032:analysis; D016381:Islets of Langerhans Transplantation / Q000276:immunology* / Q000473:pathology; D051379:Mice; D016688:Mice, Inbred NOD; D012016:Reference Values; D013154:Spleen / Q000276:immunology; D016176:T-Lymphocyte Subsets / Q000276:immunology; D014185:Transplantation, Isogeneic; D014409:Tumor Necrosis Factor-alpha / Q000032:analysis
chemical_list: D016207:Cytokines; D007004:Hypoglycemic Agents; D049528:Insulin, Long-Acting; D007376:Interleukin-2; D014409:Tumor Necrosis Factor-alpha; D016753:Interleukin-10; D015847:Interleukin-4; D007371:Interferon-gamma