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Mutation of the Foxp3 transcription factor in Scurfy (Sf) mice results in complete absence of the CD4+Foxp3+ regulatory T cells (Tregs), severe multiorgan autoimmune syndrome, and early death at 4 wk of age. However, Sf mice simultaneously bearing the Il2-/- (Sf.Il2-/-) or Faslpr/lpr gene (Sf.Faslpr/lpr) have extended lifespan despite totally lacking Tregs, indicating a role of IL-2 and CD95 (Fas) signaling pathways in the multiorgan autoimmune syndrome beyond the Treg checkpoint. IL-2 has been implicated in regulating lymphoproliferation and CD178 (FasL) expression. However, Sf.Il2-/- mice have increased lymphoproliferation and FasL expression. Importantly, the pattern of organ-specific autoimmune response of Sf.Il2-/-mice resembled IL-2 knockout mice whereas that of Sf.Faslpr/lpr was similar to Sf mice, indicating that the distinct and weakened autoimmune manifestation in IL-2 knockout mice was not caused by the residual Tregs. Our study demonstrated a novel role of IL-2 in regulating multiorgan autoimmune inflammation beyond the Treg checkpoint and indicated that both Il2-/- and Faslpr/lpr genes prolong the lifespan of Sf mice but by different mechanisms.

the journal of immunology/the journal of immunology

A Novel Role of IL-2 in Organ-Specific Autoimmune Inflammation beyond Regulatory T Cell Checkpoint: Both IL-2 Knockout and Fas Mutation Prolong Lifespan of Scurfy Mice but by Different Mechanisms