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Local synthesis of immunosuppressive glucocorticoids in the intestinal epithelium regulates anti-viral immune responses.
Cellular Immunology 2018 December
The nuclear receptor Small Heterodimer Partner (SHP) is a transcriptional target and inhibitor of Liver Receptor Homolog 1 (LRH-1), the transcriptional regulator of intestinal glucocorticoid (GC) synthesis. The role of SHP in the regulation of intestinal GC synthesis and its impact on T cell-mediated anti-viral immune responses in the intestinal mucosa are currently not understood. Lymphocytic choriomeningitis virus (LCMV) infection promoted intestinal GC synthesis, which was enhanced in SHP-deficient mice. Intestinal GC suppressed the expansion and altered the activation of virus-specific T cells. In contrast, deletion of LRH-1 reduced intestinal GC synthesis and accelerated the expansion of cytotoxic T cells post LCMV infection. These findings show that virus-induced intestinal GC synthesis is controlled by LRH-1 and SHP, and that local steroidogenesis contributes to the maintenance of intestinal immune homeostasis. Thus, LRH-1-regulated intestinal GC synthesis could represent an interesting therapeutic target in the treatment of inflammatory disorders.
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