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2016 ; 17
(7
): 1783-1794
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Programmed Death-1 Culls Peripheral Accumulation of High-Affinity Autoreactive
CD4 T Cells to Protect against Autoimmunity
#MMPMID27829150
Jiang TT
; Martinov T
; Xin L
; Kinder JM
; Spanier JA
; Fife BT
; Way SS
Cell Rep
2016[Nov]; 17
(7
): 1783-1794
PMID27829150
show ga
Self-reactive CD4 T cells are incompletely deleted during thymic development, and
their peripheral seeding highlights the need for additional safeguards to avert
autoimmunity. Here, we show an essential role for the coinhibitory molecule
programmed death-1 (PD-1) in silencing the activation of high-affinity
autoreactive CD4 T cells. Each wave of self-reactive CD4 T cells that escapes
thymic deletion autonomously upregulates PD-1 to maintain self-tolerance. By
tracking the progeny derived from individual autoreactive CD4 T cell clones, we
demonstrate that self-reactive cells with the greatest autoimmune threat and
highest self-antigen affinity express the most PD-1. Reciprocally, PD-1
deprivation unleashes high-affinity self-reactive CD4 T cells in target tissues
to exacerbate neuronal inflammation and autoimmune diabetes. Reliance on PD-1 to
actively maintain self-tolerance may explain why exploiting this pathway by
cancerous cells and invasive microbes efficiently subverts protective immunity,
and why autoimmune side effects can develop after PD-1-neutralizing checkpoint
therapies.
|*Autoimmunity
[MESH]
|Animals
[MESH]
|Autoantigens/immunology
[MESH]
|CD4-Positive T-Lymphocytes/*immunology
[MESH]
|Cell Proliferation
[MESH]
|Clone Cells
[MESH]
|Lymphocyte Activation/immunology
[MESH]
|Mice, Inbred C57BL
[MESH]
|Programmed Cell Death 1 Receptor/*metabolism
[MESH]