Specific suppression of T helper alloreactivity by allo-MHC class I-restricted CD8+CD28- T cells.
Specific suppression of the host's immune response to donor HLA antigens remains the ultimate goal for clinical transplantation. In spite of considerable effort, however, allospecific human suppressor T cells (Ts) have been difficult to generate. Here we show that allospecific and xenospecific Ts can be raised by multiple priming of human T cells in mixed lymphocyte cultures. Ts derive from the CD8+CD28- subset and recognize specifically the MHC class I antigens expressed by antigen-presenting cells (APC) used for in vitro immunization. Allospecific Ts prevent the up-regulation of B7 molecules on target APC, interfering with the CD28-B7 interaction required for T helper (Th) activation. These findings provide a basis for the development of specific immunosuppressive therapy.
Liu
Z
Z
College of Physicians and Surgeons of Columbia University, Department of Pathology, New York, NY 10032, USA.
Tugulea
S
S
Cortesini
R
R
Suciu-Foca
N
N
D000938:Antigen-Presenting Cells / Q000276:immunology; D015496:CD4-Positive T-Lymphocytes / Q000276:immunology; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology; D002460:Cell Line; D005434:Flow Cytometry; D006801:Humans; D007108:Immune Tolerance; D007959:Lymphocyte Culture Test, Mixed; D008285:Major Histocompatibility Complex / Q000276:immunology*; D016176:T-Lymphocyte Subsets / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*