University of Chicago - Department of Medicine; University of Chicago - Committee on Immunology; University of Chicago - Department of Pathology; University of Chicago - Division of Gastroenterology, Hepatology, and Nutrition
Autoimmune hepatitis (AIH) is a progressive, auto-inflammatory liver disorder mediated by interferon-γ (IFNγ)-producing CD8 T cells (Tc1-cells). Here we show that the absence of hematopoietic Tet-methylcytosine-dioxygenase2 (Tet2, Tet2ΔVAV mice), an epigenetic regulator associated with autoimmunity, results in the development of microbiota-dependent AIH-like pathology, accompanied by a hepatic enrichment of aryl-hydrocarbon-receptor (AhR) ligand-producing pathobionts. We identified that blocking IFNγ reverts ongoing AIH in Tet2ΔVAV mice, and further show that the absence of Tet2 in T cells, which are required for this condition, is sufficient to drive AIH. Further, AIH-like disease only developed in liver-dysbiotic Tet2ΔVAV mice and hepatic translocation of AhR ligand-producing Lactobacillus reuteri (L.reuteri), but not non-AhR-ligand producing L.johnsonii, was sufficient to selectively trigger Tc1-cell-mediated AIH in symptom-free Tet2ΔVAV mice. Furthermore, Tet2 within CD8 T cells antagonized L.reuteri-induced Tc1-cell fate in an AhR-dependent manner in-vitro. Our study may contribute to the development of novel therapeutic avenues that alleviate human AIH.
Pandey, Surya P. and Bender, Mackenzie J. and McPherson, Alex C. and Phelps, Catherine M. and Rana, Mohit and Hedden, Lee and Sangani, Kishan and Chen, Li and Siller, Magdalena and Goel, Chhavi and Verdú, Elena F. and Jabri, Bana and Tilstra, Jeremy S. and Pierre, Joseph, F. and Arteel, Gavin E. and Hinterleitner, Reinhard and Meisel, Marlies, Loss Of Tet2 In T Cells Drives Translocated Pathobiont Derived Aryl Hydrocarbon Receptor Agonist-Induced Tc1 Cell Autoimmune Hepatitis. Available at SSRN: https://ssrn.com/abstract=3942586 or http://dx.doi.org/10.2139/ssrn.3942586
This version of the paper has not been formally peer reviewed.
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