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Hypoxia-sensing by Colitogenic CD4+ T cells Is Regulated by the Histone Demethylase UTX [RNA-seq]

ABSTRACT: Hypoxia exacerbates tissue damage in inflammatory bowel disease (IBD). To counteract the deleterious effects of oxygen deprivation, cells within hypoxic tissues activate multiple adaptive mechanisms. Much attention has focused on adaptive pathways regulated by HIF (hypoxia inducible factor) transcription factors, and pharmacologic HIF stabilization is a promising therapeutic approach for IBD. However, recent evidence suggests that hypoxia-induction of cellular transcriptional programs can be mediated not only by HIF transcription factors, but also by oxygen-sensing epigenetic regulator, UTX. Here, we identify a key role for an UTX in modulating colitis severity. Unlike HIF-mediated pathways that act on gut epithelial cells, UTX-mediated pathways function in a T cell-intrinsic manner to protect against colitis. Hypoxia impairs the histone demethylase activity of UTX, which leads to accumulation of repressive H3K27me3 marks at IL12/STAT4 pathway genes (Il12rb2, Tbx21, and Ifng), decreased CD4+ T cell IFN-γ production, and increased CD4+ regulatory T cells (Tregs). Moreover, T cell specific UTX deletion protects mice from autoimmune colitis, which demonstrates that deactivation of UTX restores immune regulation in hypoxia-associated inflammation. Together these findings suggest that modulating UTX’s histone demethylase activity in T cells may be a new pharmacologic target for harnessing hypoxia-induced adaptive pathways in colitis.

ORGANISM(S): Mus musculus

PROVIDER: GSE236299 | GEO | 2023/12/01

REPOSITORIES: GEO

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Project description:To investigate the detailed molecular mechanisms for the regulatory role of HIF-2α in experimental colitis, microarray gene expression analysis was performed on colon RNA isolated from 6- to 8-week-old Hif-2αF/F, Hif-2αlΔIE mice treated with 3%DSS for 3 days. Background & Aims: Hypoxic inflammation is characterized by decreased oxygen tension in inflammatory foci, and is a notable feature in inflammatory bowel disease (IBD). Hypoxic response is mediated by transcription factors hypoxia-inducible factor (HIF)-1α and HIF-2α, both of which are highly induced in IBD. HIF-1α is a protective factor that limits intestinal barrier dysfunction during inflammation. However, the role of HIF-2α has not been assessed in hypoxic inflammation and IBD. Methods: A hypoxia reporter mouse model was used to test the presence of hypoxia and HIF-2α in dextran sulfate sodium (DSS) and Citrobacter rodentium (C.rod)-induced colitis. The role of HIF-2α in these mouse models of colitis was further assessed in mice with an intestinal epithelium-specific gain- and loss-of-function of HIF-2α. Results: Induction of hypoxia and HIF-2α was confirmed in both murine experimental colitis models and human IBD samples. Disruption of HIF-2α attenuated colonic inflammation whereas stabilization of HIF-2α potentiated inflammation in mouse models of colitis. Interestingly, intestine specific overexpression of HIF-2α but not HIF-1α leads to spontaneous colitis and premature death in mice. Further mechanistic analysis showed that HIF-2α is a driver for pro-inflammatory response and is critical regulator of intestinal epithelial-derived tumor necrosis factor (TNF)-α. Blocking TNF-α completely ameliorated HIF-2α potentiated intestinal inflammation. Conclusions: These data demonstrate that HIF-2α is a critical transcription factor essential in intestinal epithelium elicited inflammatory response. Global gene expression profiling in colon RNAs isolated from 7-week-old Hif-2αF/F (n=6, Shah 007) and Hif-2αΔIE (n=5, Shah 008).

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Hypoxia-sensing by Colitogenic CD4+ T cells Is Regulated by the Histone Demethylase UTX [RNA-seq]

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