Gut microbiota and motility
Ontology highlight
ABSTRACT:
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| Other | ||||
| CXPF01.dat.gz | Other | |||
| CXPF01.fasta.gz | Fasta.gz | |||
| CXPF01.master.dat | Other | |||
| CXPH01.dat.gz | Other |
Items per page: 5 1 - 5 of 2575 |
Similar Datasets
Project description:We illustrate an approach for integrating preclinical gnotobiotic animal models with human studies to understand the contributions of perturbed gut microbiota development to childhood undernutrition, and to identify new microbiota-directed therapeutic concepts/leads. Combining metabolomic and proteomic analyses of serially collected plasma samples with metagenomic analyses of serially collected fecal samples, we characterized the biological state of Bangladeshi children with severe acute malnutrition (SAM) as they transitioned to moderate acute malnutrition (MAM) after standard treatment. Gnotobiotic mice were subsequently colonized with a defined consortium of bacterial strains representing different stages of microbiota development in healthy children from Bangladesh. Administering different combinations of Bangladeshi complementary food ingredients to colonized mice and germ-free controls revealed diet-dependent changes in representation and metabolism of targeted weaning-phase strains, including accompanying increases in branched-chain amino acids, plus diet- and colonization-dependent augmentation of IGF-1/mTOR signaling. Host and microbial effects of microbiota-directed complementary food (MDCF) prototypes were subsequently examined in gnotobiotic mice colonized with post-SAM MAM microbiota and in gnotobiotic piglets colonized with a defined consortium of targeted age- and growth-discriminatory bacteria. Finally, ar andomized, double-blind study revealed a lead MDCF that affected the representation of targeted bacterial taxa and increased levels of biomarkers and mediators of growth, bone formation, neurodevelopment, and immune function.
2019-08-20 | GSE119641 | GEO
Project description:Gastrointestinal microbes modulate peristalsis and stimulate the enteric nervous system (ENS), whose development, as in the central nervous system (CNS), continues into the murine postweaning period. Given that adult CNS function depends on stimuli received during critical periods of postnatal development, we hypothesized that adult ENS function, namely motility, depends on microbial stimuli during similar critical periods. We gave fecal microbiota transplantation (FMT) to germ-free mice at weaning or as adults and found that only the mice given FMT at weaning recovered normal transit, while those given FMT as adults showed limited improvements. RNAseq of colonic muscularis propria revealed enrichments in neuron developmental pathways in mice exposed to gut microbes earlier in life, while mice exposed later – or not at all – showed exaggerated expression of inflammatory pathways. These findings highlight a microbiota-dependent sensitive period in ENS development, pointing to potential roles of the early life microbiome in later life dysmotility.
2024-10-15 | GSE241697 | GEO
Project description:Microbiota-dependent early life programming of gastrointestinal motility
| PRJNA1009128 | ENA
Project description:The human gut microbiota is an important metabolic organ, yet little is known about how its individual species interact, establish dominant positions, and respond to changes in environmental factors such as diet. In this study, gnotobiotic mice were colonized with an artificial microbiota comprising 12 sequenced human gut bacterial species and fed oscillating diets of disparate composition. Rapid, reproducible, and reversible changes in the structure of this assemblage were observed. Time-series microbial RNA-Seq analyses revealed staggered functional responses to diet shifts throughout the assemblage that were heavily focused on carbohydrate and amino acid metabolism. High-resolution shotgun metaproteomics confirmed many of these responses at a protein level. One member, Bacteroides cellulosilyticus WH2, proved exceptionally fit regardless of diet. Its genome encoded more carbohydrate active enzymes than any previously sequenced member of the Bacteroidetes. Transcriptional profiling indicated that B. cellulosilyticus WH2 is an adaptive forager that tailors its versatile carbohydrate utilization strategy to available dietary polysaccharides, with a strong emphasis on plant-derived xylans abundant in dietary staples like cereal grains. Two highly expressed, diet-specific polysaccharide utilization loci (PULs) in B. cellulosilyticus WH2 were identified, one with characteristics of xylan utilization systems. Introduction of a B. cellulosilyticus WH2 library comprising >90,000 isogenic transposon mutants into gnotobiotic mice, along with the other artificial community members, confirmed that these loci represent critical diet-specific fitness determinants. Carbohydrates that trigger dramatic increases in expression of these two loci and many of the organism’s 111 other predicted PULs were identified by RNA-Seq during in vitro growth on 31 distinct carbohydrate substrates, allowing us to better interpret in vivo RNA-Seq and proteomics data. These results offer insight into how gut microbes adapt to dietary perturbations at both a community level and from the perspective of a well-adapted symbiont with exceptional saccharolytic capabilities, and illustrate the value of artificial communities. 611 samples total (221 from experiment 1, 390 from experiment 2). Evaluation of changes in an artificial gut community's structure over time as a result of dietary oscillation.
2013-08-20 | E-GEOD-48193 | biostudies-arrayexpress
Project description:The human gut microbiota is an important metabolic organ, yet little is known about how its individual species interact, establish dominant positions, and respond to changes in environmental factors such as diet. In this study, gnotobiotic mice were colonized with an artificial microbiota comprising 12 sequenced human gut bacterial species and fed oscillating diets of disparate composition. Rapid, reproducible, and reversible changes in the structure of this assemblage were observed. Time-series microbial RNA-Seq analyses revealed staggered functional responses to diet shifts throughout the assemblage that were heavily focused on carbohydrate and amino acid metabolism. High-resolution shotgun metaproteomics confirmed many of these responses at a protein level. One member, Bacteroides cellulosilyticus WH2, proved exceptionally fit regardless of diet. Its genome encoded more carbohydrate active enzymes than any previously sequenced member of the Bacteroidetes. Transcriptional profiling indicated that B. cellulosilyticus WH2 is an adaptive forager that tailors its versatile carbohydrate utilization strategy to available dietary polysaccharides, with a strong emphasis on plant-derived xylans abundant in dietary staples like cereal grains. Two highly expressed, diet-specific polysaccharide utilization loci (PULs) in B. cellulosilyticus WH2 were identified, one with characteristics of xylan utilization systems. Introduction of a B. cellulosilyticus WH2 library comprising >90,000 isogenic transposon mutants into gnotobiotic mice, along with the other artificial community members, confirmed that these loci represent critical diet-specific fitness determinants. Carbohydrates that trigger dramatic increases in expression of these two loci and many of the organism’s 111 other predicted PULs were identified by RNA-Seq during in vitro growth on 31 distinct carbohydrate substrates, allowing us to better interpret in vivo RNA-Seq and proteomics data. These results offer insight into how gut microbes adapt to dietary perturbations at both a community level and from the perspective of a well-adapted symbiont with exceptional saccharolytic capabilities, and illustrate the value of artificial communities. 116 samples total. In 26 of these samples, we evaluated community-wide gene expression using RNA isolated from the feces of a gnotobiotic mouse harboring an artificial community comprised of 12 human gut microbes. For these samples, we sought to determine the extent to which community gene expression is altered as a result of dietary oscillation. In the other 90 samples, we evaluated gene expression in a single species (B. cellulosilyticus WH2) grown in a defined medium supplemented with a single mono-, oligo-, or polysaccharide. For these samples, we sought to identify genes (particularly polysaccharide utilization loci) whose expression was significantly increased as a result of exposure to particular carbohydrates.
2013-08-20 | E-GEOD-48993 | biostudies-arrayexpress
Project description:Many bacteria convert bicyclic compounds, such as indole and naphthalene, to oxidized compounds, including hydroxyindoles and naphthols. Pseudomonas aeruginosa, a ubiquitous bacterium that inhabits diverse environments, shows pathogenicity against animals, plants and other microorganisms, and increasing evidence has shown that several bicyclic compounds alter the virulence-related phenotypes of P. aeruginosa. Here, we revealed that hydroxyindoles (4- and 5-hydroxyindoles) and naphthalene derivatives bearing hydroxyl groups specifically inhibit swarming motility but have minor effects on other motilities, including swimming and twitching, in P. aeruginosa. Further analyses using 1-naphthol showed that this effect is also associated with clinically isolated hyper swarming P. aeruginosa cells. Swarming motility is associated with the dispersion of cells from biofilms, and the addition of 1-naphthol maintained biofilm biomass without cell dispersion. Swarming inhibition did not mediate rhamnolipid production, which regulates swarming motility in P. aeruginosa. Transcriptome analyses revealed that 1-naphthol increases gene expression associated with multidrug efflux and represses gene expression associated with aerotaxis and pyochelin, flagellar, and pili synthesis. In the present study, we showed that several bicyclic compounds bearing hydroxyl groups inhibit the swarming motility of P. aeruginosa, and these results provide new insight into the chemical structures that inhibit the specific phenotypes of P. aeruginosa. In total 4 samples: gene expressions of P. aeruginosa with (2 samples) or without (2 samples) 1-naphthol
2015-02-20 | E-GEOD-60343 | biostudies-arrayexpress
Project description:Biophysical features of the microenvironment such as stiffness of extracellular matrix (ECM), nanotopography, and biomechanical force are critical regulators of cellular potential and behavior, yet the effects of extrinsic mechanical cues on tumor cells remain poorly understood. Here we demonstrate that frictional force, or wall shear stress (WSS), caused by fluid flow supports invasive behavior in cancer cells through activation of negative effectors of the Hippo tumor suppressor pathway, YAP and TAZ. In biomimetic models of lymphatic vasculature, WSS stimulated motility. These effects were accompanied by YAP dephosphorylation at ser-127, YAP and TAZ nuclear localization, and transactivation of YAP/TAZ downstream targets, including CTGF, AMOTL2, and ANKRD1. YAP, but not TAZ, was strictly required for WSS-enhanced motility, as knockdown of YAP or blockade of YAP-TEAD interactions by a small molecule inhibitor, verteporfin, reduced cellular velocity to levels observed in static controls. YAP-mediated effects on motility were dependent upon Rho-associated kinase (ROCK) and LIM-domain kinase (LIMK), as pharmacological inhibition of their activity led to activation of the actin-severing protein cofilin and blocked YAP dephosphorylation by WSS, thereby impairing migration. These data provide a signaling mechanism whereby biomechanical forces may influence cancer cell metastasis and implicate YAP as a core component of mechanosensitive machinery that modulates cancer progression.
2017-03-08 | GSE73284 | GEO
Project description:Purpose: Pseudomonas aeruginosa is a Gram-negative opportunistic pathogen that undergoes swarming motility in response to semisolid conditions with amino acids as a nitrogen source. With a genome encoding hundreds of potential intergenic small RNAs (sRNAs), P. aeruginosa can easily adapt to different conditions and stresses. We previously identified 20 sRNAs dysregulated under swarming conditions and here provide phenotypic characterization for these sRNAs. Methods: Here, these sRNA were overexpressed in strain PAO1 and subjected to an array of phenotypic screens. Results: Overexpression of prrH resulted in decreased swimming motility, while a ∆prrH mutant had decreased cytotoxicity and increased pyoverdine production. Overexpression of the previously uncharacterized PA2952.1 resulted in decreased swarming and swimming motility, increased gentamicin and tobramycin resistance under swarming conditions, and increased trimethoprim susceptibility. RNA-Seq and proteomics were performed on the wildtype overexpressing PA2952.1 cf. the empty vector control under swarming conditions, and revealed the differential expression of 784 genes and differential abundance of 445 proteins. Amongst these were found 82 transcriptional regulators, two-component systems, sigma and anti-sigma factors. Downstream effectors included downregulated pili, dysregulated flagellar genes, the upregulated efflux pump MexGHI-OpmD, the upregulated arn operon, and downregulated DNA synthesis genes. Genes involved in iron and zinc uptake were also dysregulated, and certain pyoverdine and phenazine genes were upregulated. Conclusions: Overall, the sRNAs PA2952.1 and prrH appeared to be involved in regulating virulence-related programs in P. aeruginosa, including iron acquisition and motility.
2020-11-04 | GSE146765 | GEO
Project description:Pseudomonas protegens Pf-5 motility TraDIS
| PRJEB56281 | ENA