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. 2025 Jul 18;10(109):eadm6843.
doi: 10.1126/sciimmunol.adm6843. Epub 2025 Jul 18.

OTUD3 prevents ulcerative colitis by inhibiting microbiota-mediated STING activation

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OTUD3 prevents ulcerative colitis by inhibiting microbiota-mediated STING activation

Bo Li et al. Sci Immunol. .

Abstract

Ulcerative colitis (UC) develops through a complicated interaction between the host and microbiota. Intestinal fibroblasts are believed to play crucial roles in the pathogenesis of UC, but the influence of the host-microbiota interaction on the pathophysiology of intestinal fibroblasts remains poorly understood. Here, we demonstrate that OTU deubiquitinase 3 (OTUD3) suppresses pathologic activation of fibroblasts exposed to microbial cyclic GMP-AMP (3'3'-cGAMP) in the colon by deubiquitinating stimulator of interferon genes (STING). Mice harboring a UC risk missense variant in the Otud3 gene showed pathological features of UC in the colon after transplantation of a fecal microbiota with the potential to produce excessive cGAMP from patients with UC. Collectively, these results highlight a mechanism of the interaction between OTUD3 in host fibroblasts and STING-activating microbiota in UC development.

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