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Adaptive immunity is essentially required to control acute infection with enteropathogenic Yersinia pseudotuberculosis (Yptb). We have recently demonstrated that Yptb can directly modulate naïve CD4 + T cell differentiation. However, whether fully differentiated forkhead box protein P3 (Foxp3 + ) regulatory T cells (Tregs), fundamental key players to maintain immune homeostasis, are targeted by Yptb remains elusive. Here, we demonstrate that within the CD4 + T cell compartment Yptb preferentially targets Tregs and injects Yersinia outer proteins (Yops) in a process that depends on the type III secretion system and invasins. Remarkably, Yop-translocation into ex vivo isolated Foxp3 + Tregs resulted in a substantial downregulation of Foxp3 expression and a decreased capacity to express the immunosuppressive cytokine interleukin-10 (IL-10). Together, these findings highlight that invasins are critically required to mediate Yptb attachment to Foxp3 + Tregs, which allows efficient Yop-translocation and finally enables the modulation of the Foxp3 + Tregs' suppressive phenotype.

european journal of microbiology and immunology

<i>Yersinia pseudotuberculosis</i>modulates regulatory T cell stability via injection of yersinia outer proteins in a type III secretion system-dependent manner

Yersinia pseudotuberculosismodulates regulatory T cell stability via injection of yersinia outer proteins in a type III secretion system-dependent manner