Uncultured bacterium
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA420927 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR6379180.fastq.gz | Fastqsanger.gz | |||
| SRR6379190_1.fastq.gz | Fastqsanger.gz | |||
| SRR6379190_2.fastq.gz | Fastqsanger.gz | |||
| SRR6379200_1.fastq.gz | Fastqsanger.gz | |||
| SRR6379200_2.fastq.gz | Fastqsanger.gz |
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2016-03-27 | E-GEOD-79631 | biostudies-arrayexpress
Project description:Nlrp6-/- lamina propria Ly6C-hi monocytes in response to AOM/DSS have deficient TNFα production, but increased production of other pro-inflammatory cytokines as compared to WT NLRP6 is a member of the Nod-like receptor family, whose members are involved in the recognition of microbes and/or tissue injury. NLRP6 was previously demonstrated to regulate the production of IL-18 and is important for protecting mice against chemically-induced intestinal injury and colitis-associated colon cancer. However, the cellular mechanisms by which NLRP6 reduces susceptibility to colonic inflammation remain unclear. Here, we determined that NLRP6 expression is specifically upregulated in Ly6Chi inflammatory monocytes that infiltrate into the colon during dextran sulfate sodium (DSS)-induced inflammation. Adoptive transfer of WT Ly6Chi inflammatory monocytes into Nlrp6-/- mice was sufficient to protect them from mortality, significantly reducing intestinal permeability and damage. NLRP6-deficient inflammatory monocytes were specifically defective in TNFα production, which was important for reducing DSS-induced mortality and dependent on autocrine IL-18 signaling by inflammatory monocytes. Our data reveal a previously unappreciated role for NLRP6 in inflammatory monocytes, which are recruited during intestinal injury to promote barrier function and limit bacteria-driven inflammation. This study also highlights the importance of early cytokine responses, particularly NLRP6-dependent and IL-18-dependent TNFα production in preventing chronic dysregulated inflammation.
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Project description:Estrogen receptor β (ERβ) and NOD-, LRR- and pyrin domain-containing 6 (NLRP6) are highly expressed in intestinal tissues and reduce intestinal inflammation, but their underlying mechanisms are unclear. We found that ERβ and NLRP6 levels were reduced in patients with inflammatory bowel disease (IBD), and that deletion of ERβ or NLRP6 was exacerbated colitis in mouse models. We discovered that ERβ exerted its anti-inflammatory activity by inducing NLRP6-mediated autophagy. Specifically, ERβ directly regulated NLRP6 gene expression and NLRP6 inflammasome activation through genomic and non-genomic effects. NLRP6 directly interacted with multiple autophagy-related proteins (including ULK1, BECN1, ATG5-ATG12-ATG16L1 complex, p62, and PHB2). Autophagy stimulation suppresses the inflammatory response by eliminating excess ERβ, NLRP6, ASC, Casp-1, IL-1β, TNF-α and damaged mitochondria. These findings indicate that ERβ-NLRP6-autophagy forms a negative feedback loop to maintain intestinal epithelial cell homeostasis and facilitate tissue repair.
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Project description:Nutrition has a vital role in shaping the intestinal microbiome. The impact of nutrients and the consequences of enteral deprivation on the small intestinal mucosal microbiota, specifically in early life, has not been well described. Our aim was to study the impact of enteral deprivation on the small intestine mucosal microbiome and to search for factors that shape this interaction in early life. Host seem to be the most dominant factor in the structure of the early life mucosal microbial small intestine community. Under conditions of nutrient deprivation, there are specific changes in host proteomics. Further research is needed to better define and understand this host-microbe-nutrition interaction in the small intestine.
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