Ontology highlight
ABSTRACT:
PROVIDER: PRJNA1131789 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR29705465_1.fastq.gz | Fastqsanger.gz | |||
| SRR29705465_2.fastq.gz | Fastqsanger.gz | |||
| SRR29705466_1.fastq.gz | Fastqsanger.gz | |||
| SRR29705466_2.fastq.gz | Fastqsanger.gz | |||
| SRR29705467_1.fastq.gz | Fastqsanger.gz |
Items per page: 5 1 - 5 of 24 |
Similar Datasets
Project description:<p>BACKGROUND: The gut microbiome and the host immune system interact synergistically to maintain intestinal health and defend against infections. Toll-like receptor 5 (TLR5), known for recognizing bacterial flagellin, plays a pivotal role in this regulatory network. Despite significant advances in understanding the gut microbiome and TLR5, the precise role of TLR5 in gut health and infection resistance remains unclear. This study aimed to elucidate the role of TLR5 in regulating gut microbiota and metabolites and their impact on resistance to Salmonella infection using a TLR5 intestinal-specific overexpression mouse model. </p><p>METHODS: Fecal microbiota and metabolite transplantation experiments were conducted using feces from TLR5-overexpressing mice (TLR5+/+ group) and wild-type mice (WT group) into C57 mice, creating four experimental groups: Flora-TLR5-C57, Metabolite-TLR5-C57, Flora-WT-C57 and Metabolite-WT-C57. Mice were infected with Salmonella, and various parameters including survival time, fecal Salmonella load, and alterations in gut microbiota and metabolites were assessed. </p><p>RESULTS: Despite notable shifts in gut microbiota composition and metabolite profiles induced by TLR5 overexpression, no significant differences in fecal Salmonella load or survival time were observed across the experimental groups. TLR5-overexpressing mice exhibited an enrichment of beneficial bacterial taxa and significant changes in metabolites; however, these alterations did not correlate with enhanced resistance to Salmonella infection. </p><p>CONCLUSION: Our findings suggest that while TLR5 overexpression significantly modifies gut microbiota and metabolite profiles, these changes do not directly enhance resistance to Salmonella infection. The immune response to Salmonella is multifaceted and involves various components beyond the gut microbiota and metabolites. Further research is required to elucidate the detailed molecular pathways through which TLR5 influences infection outcomes and to explore potential combined therapeutic strategies for enhancing host defenses against enteric pathogens.</p>
2024-07-25 | MTBLS10592 | MetaboLights
Project description:Flagellins from commensal bacteria can be weak Toll-like receptor (TLR)5 agonists despite high affinity binding to TLR5, ligands we termed “silent flagellins”. To determine if silent flagellins are detectable in the human gut, endogenous flagellins produced by the microbiota were isolated from stool obtained from a healthy adult female donor. TLR5 was used as bait to enrich for silent flagellins and TLR5-bound flagellins were identified by searching peptides against a custom flagellin database built from metagenome sequences.
2022-10-12 | PXD033249 | Pride
Project description:Increased researches show that complement, the codominant central mediator of humoral immunity, is a critical factor in tumor initiation, development, and chemotherapy resistance. C5a/C5aR1 signaling has been shown to promote tumor progression by recruiting MDSCs in breast malignancies And blockade of C5aR1 resets M1 via gut microbiota-mediated PFKM stabilization in a TLR5-dependent manner. We here report that TLR5 as a key regulator of tumor associated macrophages M1 polarization. Flagellin, the protein subunit of the bacterial flagellum, stimulates the innate immune receptor Toll-like receptor 5 (TLR5) after pattern recognition. Receptor activity was turned by a TLR5-flagellin interaction distal to the site of pattern recognition. Thus, activation of downstream signaling pathway is promoted.
2024-01-20 | GSE252048 | GEO
Project description:The healthy gut microbiota is composed of three different functional subgroups, symbionts, commensals and pathobionts. Additionally, infection with pathogenic bacteria can occur. Microbe Associated Molecular Patterns (MAMPs) are expressed by most members of both, microbiota and pathogens and interact with Pattern Recognition Receptors (PRRs), resulting in activation of the innate immune system. It is still unclear whether the interaction of PRRs with MAMPs of different origin, leads to a differential activation of innate immunity and whether thereby, distinction can be made between symbionts, commensals, pathobionts and pathogens. Here we addressed the question whether the interaction of flagellin with Toll-like receptor 5 (TLR5) might be a possible mechanism of the innate immune system to distinguish between the different microbial subgroups and initiate the respective immune response. To characterize distinct cellular immune responses to symbiont or pathogen derived flagellin we run transcriptomics, phosphoproteomics and proteomics of TLR5 overexpressing cells. Responses to different flagellins were characterized by differential kinetics and regulation of protein phosphorylation as well as variant protein expression patterns. In vivo experiments revealed that commensal derived flagellin mediated an inert TLR5 signal, thus not affecting Dextran-Sodium-Sulfate (DSS) induced intestinal inflammation. In vitro pathogenic derived flagellin induced a strong pro-inflammatory TLR5 response and did not ameliorate intestinal inflammation. In contrast, symbiont derived flagellin revealed an intermediate TLR5 activation and clearly ameliorated DSS induced intestinal inflammation thus shifting the host immune response in favor of mucosal immune balance. Bone marrow chimeric mice proofed that CD11c+TLR5+ intestinal lamina propria cells mediate the anti-inflammatory symbiotic effect of flagellin. We suggest that the quality of flagellin-induced TL signal might determine the balance between homeostasis and intestinal inflammation and may help the innate immune system to distinguish between symbionts, commensals, pathobionts and pathogenic microbes. We used microarrays to analyze differential expression of genes between treatments with flagellins of E. coli Nissle (EcN) and Salmonella Typhimurium SL1344 (ST).
2020-12-01 | GSE71660 | GEO
Project description:Transcriptional profiling of mouse gut wall tissue following infection with Salmonella or treatment with Probiotics to see the role of probiotics in preventing salmonella infection through gut mucosal route of mouse.
2018-06-18 | GSE98353 | GEO
Project description:Salmonella enterica serovar Typhimurium is a gram-negative bacterium that can colonize the gut of humans and several species of food producing farm animals to cause enteric or septicaemic salmonellosis. Besides compromising public health and food safety, sub-clinical salmonellosis is also believed to be a major problem affecting the profitability of the pig industry. Distinct responses to Salmonella infection have been observed in pigs, some recovering faster and shedding lower levels of Salmonella in faeces than others (low shedders, LS versus persistent shedders, PS). This trait variation could indicate the existence of a genetic component to Salmonella shedding and resistance that may be exploited in animal breeding and disease diagnostics. The study aimed to characterize changes in miRNA expression in response to Salmonella infection.
2015-10-22 | E-MTAB-2286 | biostudies-arrayexpress
Project description:Autophagy, a cytoprotective mechanism in intestinal epithelial cells, plays a crucial role in maintaining intestinal homeostasis. Beyond its cell-autonomous effects, the significance of autophagy in these cells is increasingly acknowledged in the dynamic interplay between the microbiota and the immune response. In the context of colon cancer, intestinal epithelium disruption of autophagy has been identified as a critical factor influencing tumor development. This disruption modulates the composition of the gut microbiota, eliciting an anti-tumoral immune response. Here, we report that Atg7 deficiency in intestinal epithelial cells shapes the intestinal microbiota leading to an associated limitation of colitis induced by Citrobacter rodentium infection. Mice with an inducible, intestinal epithelial-cell-specific deletion of the autophagy gene, Atg7, exhibited enhanced clearance of C. rodentium, mitigated hyperplasia, and reduced pathogen-induced goblet cell loss. This protective effect is associated with the downregulation of pro-inflammatory pathways and an increase in Th17 and Treg responses—known protective immune responses against C. rodentium infection that are influenced by specific gut microbiota. Fecal microbiota transplantation and antibiotic treatment approaches revealed that the Atg7-deficiency-shapped microbiota, especially Gram-positive bacteria, plays a central role in driving resistance to C. rodentium infection. In summary, our findings highlight that inhibiting autophagy in intestinal epithelial cells contributes to maintaining homeostasis and preventing detrimental intestinal inflammation through microbiota-mediated colonization resistance against C. rodentium. This underscores the central role played by autophagy in shaping the microbiota in promoting immune-mediated resistance against enteropathogens
2025-02-26 | GSE279997 | GEO
Project description:Systemic infection induces conserved physiological responses that include both resistance and ‘tolerance of infection’ mechanisms. Among these responses, temporary anorexia associated with an infection is often beneficial. It poses, however, a problem for the trillions of microbes residing in the gastrointestinal tract, as they also experience reduced substrate availability. We hypothesized that under anorectic conditions caused by infection, the host might activate protective mechanisms to support the gut microbiota during the acute phase of the disease. Here, we report that systemic exposure to Toll-like receptor (TLR) ligands causes rapid α1,2-fucosylation of the small intestine epithelial cells (IEC). The process requires sensing of TLR agonists and production of IL-23 by dendritic cells, activation of innate lymphoid cells and expression of α1,2-Fucosyltransferase-2 (Fut2) by IL-22-stimulated IECs. Fucosylated proteins are shed into the lumen and fucose is utilized by microbiota, as shown using reporter bacteria and by transcriptional profiling of the gut microbiome. Fucosylation also reduces the expression of bacterial virulence genes within the commensal gut microbiome and improves host tolerance of the mild pathogen Citrobacter rodentium. Thus, rapid IEC fucosylation appears to be a protective mechanism that utilizes the host’s resources to maintain host-microbial interactions during pathogen-induced stress. RNA-Seq analysis of the murine gut microbiome following LPS exposure. Fut2-/- (B6.129X1-Fut2tm1Sdo/J) mice were backcrossed greater than 7 generations to BALB/c. Fut2-/- (KO) and Fut2+/- (Het) animals were analyzed.
2014-10-24 | E-GEOD-60874 | biostudies-arrayexpress
Project description:Gut microbiota contributes to the regulation of host immune response and homeostasis. Bile acid (BA) derivatives from gut microbiota can affect the differentiation and function of the immune cells. However, it is incompletely clear for the regulation of BA metabolites in the macrophages. We here find that BA metabolites can regulate sensitivity of macrophages to LPS and or Gram-negative bacteria. BA derivatives could induce lncRNA57RIK expression through sphingosine-1-phosphate receptor 2 (S1PR2) in the macrophages of mice and humans, which play a critical role in Gram-negative bacteria mediated IL-1β maturation and pyroptosis of macrophages. This lncRNA57RIK could bind intracellular proteases caspase-4/11 with guanylate-binding protein 1 (GBP1) in the human and mice together to cause LPS mediated activation of caspase-4/11. Murine or human lncRNA57RIK knockout (KO) macrophages did not produce response(s) to LPS or gram negative bacteria. LncRNA57RIK KO mice had also reduced inflammatory responses to LPS or Salmonella typhimurium (S.T) infection. Taken together, gut microbiota derived BA metabolites mediated lncRNA57RIK is necessary for LPS induced caspase-4/11 activation.
2024-09-21 | GSE277195 | GEO
Project description:Salmonella enterica serovar Typhimurium is a gram-negative bacterium that can colonize the gut of humans and several species of food producing farm animals to cause enteric or septicaemic salmonellosis. Besides compromising public health and food safety, sub-clinical salmonellosis is also believed to be a major problem affecting the profitability of the pig industry. Distinct responses to Salmonella infection have been observed in pigs, some recovering faster and shedding lower levels of Salmonella in faeces than others (low shedders, LS versus persistent shedders, PS). This trait variation could indicate the existence of a genetic component to Salmonella shedding and resistance that may be exploited in animal breeding and disease diagnostics. The study aimed to identify porcine genes and gene co-expression networks that differentiate distinct responses to Salmonella challenge with respect to faecal Salmonella shedding.
2014-06-11 | E-MTAB-2234 | biostudies-arrayexpress