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CD4+ regulatory T cells control Th17 responses in a Stat3-dependent manner #MMPMID19797626
Chaudhry A; Rudra D; Treuting P; Samstein RM; Liang Y; Kas A; Rudensky AY
Science 2009[Nov]; 326 (5955): 986-91 PMID19797626show ga
Distinct classes of protective immunity are guided by activation of STAT transcription factor (TF) family members in response to environmental cues. CD4+ regulatory T cells (Tregs) suppress excessive immune responses, and their deficiency results in a lethal, multi-organ autoimmune syndrome characterized by T helper 1 (Th1) and T helper 2 (Th2) CD4+ T cell-dominated lesions. Here we show that pathogenic Th17 responses in mice are also restrained by Tregs. This suppression was lost upon Treg-specific ablation of Stat3, a TF critical for Th17 differentiation, and resulted in the development of a fatal intestinal inflammation. These findings suggest that Tregs adapt to their environment by engaging distinct effector response-specific suppression modalities upon activation of STAT proteins that direct the corresponding class of the immune response.