Glucocorticoid Receptor-Deficient Foxp3+ Regulatory T Cells Fail to Control Experimental Inflammatory Bowel Disease.

Abstract

Activation of the immune system increases systemic adrenal-derived glucocorticoid (GC) levels which downregulate the immune response as part of a negative feedback loop. While CD4+ T cells are essential target cells affected by GC, it is not known whether these hormones exert their major effects on CD4+ helper T cells, CD4+Foxp3+ regulatory T cells (Treg cells), or both. Here, we generated mice with a specific deletion of the glucocorticoid receptor (GR) in Foxp3+ Treg cells. Remarkably, while basal Treg cell characteristics and in vitro suppression capacity were unchanged, Treg cells lacking the GR did not prevent the induction of inflammatory bowel disease in an in vivo mouse model. Under inflammatory conditions, GR-deficient Treg cells acquired Th1-like characteristics and expressed IFN-gamma, but not IL-17, and failed to inhibit pro-inflammatory CD4+ T cell expansion in situ. These findings reveal that the GR is critical for Foxp3+ Treg cell function and suggest that endogenous GC prevent Treg cell plasticity toward a Th1-like Treg cell phenotype in experimental colitis. When equally active in humans, a rationale is provided to develop GC-mimicking therapeutic strategies which specifically target Foxp3+ Treg cells for the treatment of inflammatory bowel disease.

• Authors: Lourdes Rocamora-Reverte, Selma Tuzlak, Laura von Raffay, Marcel Tisch, Heidi Fiegl, Mathias Drach, Holger M Reichardt, Andreas Villunger, Denise Tischner, G Jan Wiegers
• Journal: Frontiers in immunology (Front Immunol) Vol. 10 Pg. 472 ( 2019) ISSN: 1664-3224 [Electronic] Switzerland
• PMID: 30936873 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)

Chemical References

• Antibodies, Antinuclear
• Cytokines
• Forkhead Transcription Factors
• Foxp3 protein, mouse
• Glucocorticoids
• Receptors, Glucocorticoid

Topics

• Adoptive Transfer (adverse effects)
• Animals
• Antibodies, Antinuclear (biosynthesis)
• CD4-Positive T-Lymphocytes (immunology)
• Cell Survival
• Colitis (etiology, immunology)
• Cytokines (biosynthesis)
• Disease Models, Animal
• Female
• Forkhead Transcription Factors (analysis)
• Gene Knockdown Techniques
• Glucocorticoids (physiology)
• Inflammatory Bowel Diseases (immunology)
• Lymphocyte Activation
• Male
• Mice
• Organ Specificity
• Receptors, Glucocorticoid (deficiency, genetics, physiology)
• Self Tolerance
• Spleen (immunology, pathology)
• T-Lymphocyte Subsets (immunology, transplantation)
• T-Lymphocytes, Regulatory (chemistry, immunology)
• Thymus Gland (immunology, pathology)