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2017 ; 199
(1
): 33-38
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Cutting Edge: Dual TCR? Expression Poses an Autoimmune Hazard by Limiting
Regulatory T Cell Generation
#MMPMID28539428
Schuldt NJ
; Auger JL
; Spanier JA
; Martinov T
; Breed ER
; Fife BT
; Hogquist KA
; Binstadt BA
J Immunol
2017[Jul]; 199
(1
): 33-38
PMID28539428
show ga
Despite accounting for 10-30% of the T cell population in mice and humans, the
role of dual TCR-expressing T cells in immunity remains poorly understood. It has
been hypothesized that dual TCR T cells pose an autoimmune hazard by allowing
self-reactive TCRs to escape thymic selection. We revisited this hypothesis using
the NOD murine model of type 1 diabetes. We bred NOD mice hemizygous at both TCR?
and ? (TCR?(+/-) ?(+/-)) loci, rendering them incapable of producing dual TCR T
cells. We found that the lack of dual TCR? expression skewed the insulin-specific
thymocyte population toward greater regulatory T (T(reg)) cell commitment,
resulting in a more tolerogenic T(reg) to conventional T cell ratio and
protection from diabetes. These data support a novel hypothesis by which dual TCR
expression can promote autoimmunity by limiting agonist selection of
self-reactive thymocytes into the T(reg) cell lineage.