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2015 ; 43
(5
): 896-908
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gab.com Text
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English Wikipedia
CD4+ T Cell Tolerance to Tissue-Restricted Self Antigens Is Mediated by
Antigen-Specific Regulatory T Cells Rather Than Deletion
#MMPMID26572061
Legoux FP
; Lim JB
; Cauley AW
; Dikiy S
; Ertelt J
; Mariani TJ
; Sparwasser T
; Way SS
; Moon JJ
Immunity
2015[Nov]; 43
(5
): 896-908
PMID26572061
show ga
Deletion of self-antigen-specific T cells during thymic development provides
protection from autoimmunity. However, it is unclear how efficiently this occurs
for tissue-restricted self antigens, or how immune tolerance is maintained for
self-antigen-specific T cells that routinely escape deletion. Here we show that
endogenous CD4+ T cells with specificity for a set of tissue-restricted self
antigens were not deleted at all. For pancreatic self antigen, this resulted in
an absence of steady-state tolerance, while for the lung and intestine, tolerance
was maintained by the enhanced presence of thymically-derived antigen-specific
Foxp3+ regulatory T (Treg) cells. Unlike deletional tolerance, Treg cell-mediated
tolerance was broken by successive antigen challenges. These findings reveal that
for some tissue-restricted self antigens, tolerance relies entirely on
nondeletional mechanisms that are less durable than T cell deletion. This might
explain why autoimmunity is often tissue-specific, and it offers a rationale for
cancer vaccine strategies targeting tissue-restricted tumor antigens.