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Mouse intestinal epithelial cells in the deficiency of Foxo1

ABSTRACT: Mouse intestinal epithelial cells in the deficiency of Foxo1

PROVIDER: PRJNA739893 | ENA |

REPOSITORIES: ENA

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			Action	DRS
	SRR14877337.fastq.gz	Fastqsanger.gz
	SRR14877338.fastq.gz	Fastqsanger.gz
	SRR14877339.fastq.gz	Fastqsanger.gz
	SRR14877340.fastq.gz	Fastqsanger.gz
	SRR14877341.fastq.gz	Fastqsanger.gz

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Mouse intestinal epithelial cells in the deficiency of Foxo1

Project description:Mucus produced by goblet cells in the gastrointestinal (GI) tract forms a biological barrier that protects the intestine from invasion by commensals and pathogens. However, the host-derived regulatory network that controls mucus secretion and thereby changing gut microbiota has not been well studied. We found Forkhead box protein O1 (Foxo1) regulates mucus secretion by goblet cells and determines intestinal homeostasis. Loss of Foxo1 in intestinal epithelial cells (IECs) results in a defect in goblet cell autophagy and mucus secretion, leading to impaired gut microenvironment and dysbiosis.

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Project description:Mouse intestinal epithelial cells in the deficiency of Foxo1

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Intestinal epithelial GR in the regulation of intestinal inflammation and colon cancer

Project description:The goal of this project is to investigate the role of glucocorticoids and their receptor, glucocorticoid receptor (GR), in intestinal stress response and tissue homeostasis. Using a mouse model with specific deletion of GR in intestinal epithelium (GR iKO mice), we recently discovered that intestinal epithelial GR deficiency deteriorates acute colitis while reducing chronic inflammation-associated colon cancer formation in mice. To understand the molecular mechanisms underlying these phenotypes, we examined colonic transcriptomes of Flox control and GR iKO mice treated with or without dextran sulfate sodium (DSS) for 7 days by microarray analysis.

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Project description:Tight regulation of Toll-like receptor (TLR)-mediated inflammatory responses is important in innate immunity. Here, we show that T cell death-associated gene 51 (TDAG51/PHLDA1) is a novel coactivator of the transcription factor FoxO1, regulating inflammatory mediator production in the lipopolysaccharide (LPS)-induced inflammatory response. TDAG51 induction by LPS stimulation was mediated by the TLR2/4 signaling pathway in bone marrow-derived macrophages (BMMs). LPS-induced inflammatory mediator production was significantly decreased in TDAG51-deficient BMMs. In TDAG51-deficient mice, LPS- or pathogenic Escherichia coli infection-induced lethal shock was reduced by decreasing serum proinflammatory cytokine levels. The recruitment of 14-3-3 to FoxO1 was competitively inhibited by the TDAG51-FoxO1 interaction, leading to blockade of FoxO1 cytoplasmic translocation and thereby strengthening FoxO1 nuclear accumulation. TDAG51/FoxO1 double-deficient BMMs showed significantly reduced inflammatory mediator production compared with TDAG51- or FoxO1-deficient BMMs. TDAG51/FoxO1 double deficiency protected mice against LPS- or pathogenic E. coli infection-induced lethal shock by weakening the systemic inflammatory response. Thus, these results indicate that TDAG51 acts as a coactivator of the transcription factor FoxO1, leading to strengthened FoxO1 activity in the LPS-induced inflammatory response.

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