title: Breaking of CD8+ T cell tolerance through in vivo ligation of CD40 results in inhibition of chronic graft-versus-host disease and complete donor cell engraftment.
abstract: In the DBA/2 --> unirradiated (C57BL/6 x DBA/2)F(1) model of chronic graft-vs-host disease (cGVHD), donor CD4(+) T cells play a critical role in breaking host B cell tolerance, while donor CD8(+) T cells are rapidly removed and the remaining cells fall into anergy. Previously we have demonstrated that in vivo ligation of GITR (glucocorticoid-induced TNF receptor-related gene) can activate donor CD8(+) T cells, subsequently converting the disease pattern from cGVHD to an acute form. In this study, we investigated the effect of an agonistic mAb against CD40 on cGVHD. Treatment of anti-CD40 mAb inhibited the production of anti-DNA IgG1 autoantibody and the development of glomerulonephritis. The inhibition of cGVHD occurred because anti-CD40 mAb prevented donor CD8(+) T cell anergy such that subsequently activated donor CD8(+) T cells deleted host CD4(+) T cells and host B cells involved in autoantibody production. Additionally, functionally activated donor CD8(+) T cells induced full engraftment of donor hematopoietic cells and exhibited an increased graft-vs-leukemia effect. However, induction of acute GVHD by donor CD8(+) T cells seemed to be not so apparent. Further CTL analysis indicated that there were lower levels of donor CTL activity against host cells in mice that received anti-CD40 mAb, compared with mice that received anti-GITR mAb. Taken together, our results suggest that a different intensity of donor CTL activity is required for removal of host hematopoietic cells, including leukemia vs induction of acute GVHD.
authors.affiliation: Biomedical Research Center, Ulsan University Hospital, School of Medicine, University of Ulsan, Ulsan, Republic of Korea.
authors.forename: Juyang
authors.initials: J
authors.lastname: Kim
authors.forename: Keunhee
authors.initials: K
authors.lastname: Park
authors.forename: Hyun J
authors.initials: HJ
authors.lastname: Kim
authors.forename: Jiyoung
authors.initials: J
authors.lastname: Kim
authors.forename: Hyun-A
authors.initials: HA
authors.lastname: Kim
authors.forename: Daehee
authors.initials: D
authors.lastname: Jung
authors.forename: Hye J
authors.initials: HJ
authors.lastname: Kim
authors.forename: Hye-Jeong
authors.initials: HJ
authors.lastname: Choi
authors.forename: Suck-Young
authors.initials: SY
authors.lastname: Choi
authors.forename: Kwang W
authors.initials: KW
authors.lastname: Seo
authors.forename: Hong R
authors.initials: HR
authors.lastname: Cho
authors.forename: Byungsuk
authors.initials: B
authors.lastname: Kwon
mesh_terms: D000818:Animals; D000974:Antibodies, Antinuclear / Q000097:blood / Q000276:immunology; D000911:Antibodies, Monoclonal / Q000276:immunology; D001324:Autoantigens / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D019013:CD40 Antigens / Q000037:antagonists & inhibitors*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D002908:Chronic Disease; D017635:Clonal Anergy / Q000276:immunology*; D003602:Cytotoxicity, Immunologic; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D005434:Flow Cytometry; D006086:Graft vs Host Disease / Q000276:immunology*; D020544:Graft vs Leukemia Effect / Q000276:immunology; D007150:Immunohistochemistry; D051379:Mice; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: D000974:Antibodies, Antinuclear; D000911:Antibodies, Monoclonal; D001324:Autoantigens; D019013:CD40 Antigens