alexa Resting dendritic cells induce peripheral CD8+ T cell tolerance through PD-1 and CTLA-4.
Reproductive Medicine

Reproductive Medicine

Journal of Fertilization: In Vitro - IVF-Worldwide, Reproductive Medicine, Genetics & Stem Cell Biology

Author(s): Probst HC, McCoy K, Okazaki T, Honjo T, van den Broek M

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Abstract T cells recognizing self proteins exist without causing autoimmunity in healthy individuals. These autoreactive T cells are kept in check by peripheral tolerance. Using a model for peripheral CD8(+) T cell tolerance resulting from antigen presentation by resting dendritic cells in vivo, we show here that CD8(+) T cell tolerance operates through T cell-intrinsic mechanisms such as deletion or functional inactivation. Peripheral CD8(+) T cell tolerance depended on signaling via the costimulatory molecule PD-1, as an absence of PD-1 converted tolerance induction into priming. Blocking of the costimulatory molecule CTLA-4 resulted in impaired tolerance and enhanced the effect of the absence of PD-1, suggesting that PD-1 and CTLA-4 act synergistically. Thus PD-1 and CTLA-4 are crucial molecules for peripheral CD8(+) T cell tolerance induced by resting dendritic cells. This article was published in Nat Immunol and referenced in Journal of Fertilization: In Vitro - IVF-Worldwide, Reproductive Medicine, Genetics & Stem Cell Biology

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