1. Direct recognition of hepatocyte-expressed MHC class I alloantigens is required for tolerance induction.
- Author
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Paul-Heng M, Leong M, Cunningham E, Bunker DLJ, Bremner K, Wang Z, Wang C, Tay SS, McGuffog C, Logan GJ, Alexander IE, Hu M, Alexander SI, Sparwasser TD, Bertolino P, Bowen DG, Bishop GA, and Sharland A
- Subjects
- Allografts cytology, Allografts immunology, Allografts metabolism, Animals, CD8-Positive T-Lymphocytes immunology, Dependovirus genetics, Disease Models, Animal, Epitopes, T-Lymphocyte genetics, Epitopes, T-Lymphocyte immunology, Epitopes, T-Lymphocyte metabolism, Genetic Vectors genetics, Graft Survival immunology, Hepatocytes metabolism, Histocompatibility Antigens Class I genetics, Histocompatibility Antigens Class I metabolism, Humans, Isoantigens genetics, Isoantigens metabolism, Liver cytology, Liver immunology, Liver metabolism, Liver Transplantation adverse effects, Male, Mice, Mice, Transgenic, Point Mutation, T-Lymphocytes, Regulatory immunology, Transduction, Genetic, Graft Rejection immunology, Hepatocytes immunology, Histocompatibility Antigens Class I immunology, Immune Tolerance, Isoantigens immunology
- Abstract
Adeno-associated viral vector-mediated (AAV-mediated) expression of allogeneic major histocompatibility complex class I (MHC class I) in recipient liver induces donor-specific tolerance in mouse skin transplant models in which a class I allele (H-2Kb or H-2Kd) is mismatched between donor and recipient. Tolerance can be induced in mice primed by prior rejection of a donor-strain skin graft, as well as in naive recipients. Allogeneic MHC class I may be recognized by recipient T cells as an intact molecule (direct recognition) or may be processed and presented as an allogeneic peptide in the context of self-MHC (indirect recognition). The relative contributions of direct and indirect allorecognition to tolerance induction in this setting are unknown. Using hepatocyte-specific AAV vectors encoding WT allogeneic MHC class I molecules, or class I molecules containing a point mutation (D227K) that impedes direct recognition of intact allogeneic MHC class I by CD8+ T cells without hampering the presentation of processed peptides derived from allogeneic MHC class I, we show here that tolerance induction depends upon recognition of intact MHC class I. Indirect recognition alone yielded a modest prolongation of subsequent skin graft survival, attributable to the generation of CD4+ Tregs, but it was not sufficient to induce tolerance.
- Published
- 2018
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