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Role of PD-1 and Its Ligand, B7-H1, in Early Fate Decisions of CD8 T Cells

Abstract

Expression of the PD-1 receptor on T cells has been shown to provide an important inhibitory signal that down-modulates peripheral effector responses in normal tissues and tumors. Furthermore, PD-1 up-regulation on chronically activated T cells can maintain them in a partially reversible inactive state. The function of PD-1 in the very early stages of T-cell response to antigen in vivo has not been fully explored. In this study, we evaluate the role of PD-1 and its 2 B7 family ligands, B7-H1 (PD-L1) and B7-DC (PD-L2), in early fate decisions of CD8 T cells. We show that CD8 T cells specific for influenza hemagglutinin (HA) expressed as a self-antigen become functionally tolerized and express high levels of surface PD-1 by the time of their first cell division. Blockade of PD-1 or B7-H1, but not B7-DC, at the time of self-antigen encounter mitigates tolerance induction and results in CD8 T-cell differentiation into functional cytolytic T lymphocytes (CTLs). These findings demonstrate that, in addition to modulating effector functions in the periphery, B7-H1:PD-1 interactions regulate early T-cell-fate decisions.

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References
1.
Tivol E, Borriello F, Schweitzer A, Lynch W, Bluestone J, Sharpe A . Loss of CTLA-4 leads to massive lymphoproliferation and fatal multiorgan tissue destruction, revealing a critical negative regulatory role of CTLA-4. Immunity. 1995; 3(5):541-7. DOI: 10.1016/1074-7613(95)90125-6. View

2.
Morgan D, Liblau R, Scott B, Fleck S, McDevitt H, Sarvetnick N . CD8(+) T cell-mediated spontaneous diabetes in neonatal mice. J Immunol. 1996; 157(3):978-83. View

3.
Kurts C, Kosaka H, Carbone F, Miller J, Heath W . Class I-restricted cross-presentation of exogenous self-antigens leads to deletion of autoreactive CD8(+) T cells. J Exp Med. 1997; 186(2):239-45. PMC: 2198972. DOI: 10.1084/jem.186.2.239. View

4.
Thompson C, Allison J . The emerging role of CTLA-4 as an immune attenuator. Immunity. 1997; 7(4):445-50. DOI: 10.1016/s1074-7613(00)80366-0. View

5.
Adler A, Marsh D, Yochum G, Guzzo J, Nigam A, Nelson W . CD4+ T cell tolerance to parenchymal self-antigens requires presentation by bone marrow-derived antigen-presenting cells. J Exp Med. 1998; 187(10):1555-64. PMC: 2212299. DOI: 10.1084/jem.187.10.1555. View