title: Enhancement of MHC class I-stimulated alloresponses by TNF/TNF receptor (TNFR)1 interactions and of MHC class II-stimulated alloresponses by TNF/TNFR2 interactions.
abstract: In vivo TNF inhibition has been observed to ameliorate the disease process attributed to T cell-dependent immune responses such as those generated during graft-vs.-host disease. The present studies were designed to evaluate whether TNF/TNF receptor (TNFR)1 and TNF/TNFR2 interactions were involved in the generation of allospecific T cell responses. Splenic lymphocyte populations were obtained from TNFR1- or TNFR2-deficient B6 mice and from control B6 mice. These responder cells were cultured with irradiated MHC class II-disparate B6.C-H-2bm12 (bm12) or MHC class I-disparate B6.C-H-2bm1 (bm1) or irradiated syngeneic stimulator cells for 3 days before assay of [3H]thymidine incorporation. IL-2 levels of the mixed lymphocyte culture (MLC) supernatants were assessed by enzyme-linked immunosorbent assay. With MHC class II-disparate bm12 stimulator cells, a significant reduction in T cell proliferation was observed utilizing TNFR2-deficient CD4+ responder T cells, but not when using TNFR1 -deficient CD4+ responder T cells. A significant decrease in proliferation of TNFR1-deficient CD8+ responder cells, but not of TNFR2-deficient CD8 responder T cells was observed after stimulation with MHC class I-disparate bm1 stimulator cells. IL-2 levels were lower in MLC utilizing MHC class I stimulators and TNFR1-deficient responders or MHC class II stimulators and TNFR2-deficient responders. These results indicate that TNF/TNFR2 interactions promote MHC class II-stimulated alloresponses, while TNF/TNFR1 interactions promote MHC class I-stimulated alloresponses.
authors.affiliation: Department of Internal Medicine, University of Texas Southwestern Medical Center at Dallas, 75390-9151, USA. geri.brown@email.swmed.edu
authors.forename: G R
authors.initials: GR
authors.lastname: Brown
authors.forename: D L
authors.initials: DL
authors.lastname: Thiele
mesh_terms: D000818:Animals; D015703:Antigens, CD / Q000235:genetics / Q000276:immunology*; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology; D002478:Cells, Cultured; D005260:Female; D006183:H-2 Antigens / Q000276:immunology*; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D007143:Immunoglobulin Heavy Chains / Q000737:chemistry; D007142:Immunoglobulin gamma-Chains; D007376:Interleukin-2 / Q000378:metabolism; D008213:Lymphocyte Activation / Q000187:drug effects; D007959:Lymphocyte Culture Test, Mixed; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D018124:Receptors, Tumor Necrosis Factor / Q000737:chemistry / Q000235:genetics / Q000276:immunology*; D047888:Receptors, Tumor Necrosis Factor, Type I; D047889:Receptors, Tumor Necrosis Factor, Type II; D011993:Recombinant Fusion Proteins / Q000737:chemistry / Q000494:pharmacology; D016176:T-Lymphocyte Subsets / Q000276:immunology*; D014409:Tumor Necrosis Factor-alpha / Q000037:antagonists & inhibitors / Q000502:physiology*
chemical_list: D015703:Antigens, CD; D006183:H-2 Antigens; D000949:Histocompatibility Antigens Class II; D007143:Immunoglobulin Heavy Chains; D007142:Immunoglobulin gamma-Chains; D007376:Interleukin-2; D018124:Receptors, Tumor Necrosis Factor; D047888:Receptors, Tumor Necrosis Factor, Type I; D047889:Receptors, Tumor Necrosis Factor, Type II; D011993:Recombinant Fusion Proteins; D014409:Tumor Necrosis Factor-alpha; C099374:Ro 45-2081