Cutting Edge: Dual TCRα Expression Poses an Autoimmune Hazard by Limiting Regulatory T Cell Generation.

Cutting Edge: Dual TCRα Expression Poses an Autoimmune Hazard by Limiting Regulatory T Cell Generation.
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DOI:
10.4049/jimmunol.1700406
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发表时间:
2017-07-01
期刊:
Journal of immunology (Baltimore, Md. : 1950)
影响因子:
--
通讯作者:
Binstadt BA
Binstadt BA
中科院分区:
其他
文献类型:
--
作者:
Schuldt NJ;Auger JL;Spanier JA;Martinov T;Breed ER;Fife BT;Hogquist KA;Binstadt BA

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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 (T1D). We bred NOD mice hemizygous at both TCRα and β (TCRα+/− β+/−) loci, rendering them incapable of producing dual TCR T cells. We found that the lack of dual TCRα expression skewed the insulin-specific thymocyte population toward greater regulatory T (Treg) cell commitment, resulting in a more tolerogenic Treg to conventional T (Tconv) 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 Treg cell lineage.
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