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- W4385612168 abstract "ABSTRACT Foxp3 + Treg cells of thymic (tTreg) and peripheral (pTreg) developmental origin are thought to synergistically act to ensure immune homeostasis, with self-reactive tTreg cells primarily constraining autoimmune responses. We exploited tTreg-specific GFP/Cre recombinase activity to selectively ablate either tTreg (ΔtTreg) or pTreg (ΔpTreg) cell development. In contrast to the tTreg cell behavior in ΔpTreg mice, pTreg cells with a highly activated suppressor phenotype replenished the Treg cell pool of C57BL/6.ΔtTreg mice, preventing early mortality and fatal autoimmunity. Even with advancing age, pTreg cells largely maintained immune tolerance in C57BL/6.ΔtTreg mice. However, only two generations of (C57BL/6>NOD) backcrossing precipitated severe disease lethality associated with a distinct, partially overlapping pattern of organ-specific autoimmunity. Genetic association studies defined a small set of autoimmune risk loci sufficient to unleash a particularly severe form of diabetes, including genes known to impinge on Treg cell biology. Thus, pTreg cells exhibit an unexpectedly high functional adaptability, emphasizing their importance as mediators of bystander effects to ensure self-tolerance. SUMMARY This study in complementary loss-of-function mouse models uncovers an unexpected functional plasticity of pTreg cells in constraining systemic autoimmune responses in the absence of tTreg cells and identifies tTreg cells as primary regulators of β-cell autoimmunity in type 1 diabetes." @default.
- W4385612168 created "2023-08-06" @default.
- W4385612168 creator A5031798521 @default.
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- W4385612168 date "2023-08-06" @default.
- W4385612168 modified "2023-09-27" @default.
- W4385612168 title "Selective ablation of thymic and peripheral Foxp3<sup>+</sup>regulatory T cell development" @default.
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