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Outer membrane vesicles secreted by pathogenic and nonpathogenic Bacteroides fragilis represent different metabolic activities

ABSTRACT: B.fragilis cell and OMVs HPLC-MS/MS metabolome results

INSTRUMENT(S): LC-QQQ Shimadzu 8030

ORGANISM(S): Bacteroides Fragilis (ncbitaxon:817)

SUBMITTER: N. Zakharzhevskaya

PROVIDER: MSV000080304 | MassIVE | Tue Nov 01 04:00:00 GMT 2016

REPOSITORIES: MassIVE

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Outer membrane vesicles secreted by pathogenic and nonpathogenic Bacteroides fragilis represent different metabolic activities.

Project description: Not available

| S-EPMC5503946 | biostudies-literature

Bacteroides fragilis outer membrane vesicles

Project description:Number of publications show that intestinal microflora vesicles secretion is essential for the maintaining homeostasis. Conducted comprehensive genomic, transcriptomic and proteomic studies of vesicles determine the nature and the basic mechanisms of bacterial influence to the host. The role of the vesicles to a greater extent is defined as carriers of virulence factors or enzymes determining the nutritional function. In addition some bacterial vesicles have a special mission. B.fragilis vesicles are providing anti-inflammatory effect on the colon immune cells. However there is no information about possible role of vesicles secreted by ETBF, contributing bowel disease development and colon cancer. To determine possible effects of ETBF vesicles to the host compared with NTBF, we performed comprehensive proteome and for the first time metabolome analysis and reconstructed pathways for vesicles of both strains with subsequent confirmation of the activity of one of the main pathway by fluxome analysis. A detailed analysis of the vesicles allowed us to discover a new quality of ETBF vesicles as intelligent systems capable of absorbing and processing of exogenous substrates. We believe that this property allows them to maintain stability for a long time and implement mechanisms of pathogenicity.

2017-11-13 | PXD005255 | Pride

Outer Membrane Vesicles Secreted by Bacteroides fragilis Inhibit CFTR Chloride Secretion by Human Colon Organoids

Project description:The goals of this study were to develop a model to study host pathogen interactions in primary human colon organoids and to test the hypothesis that Bacteroides fragilis toxin (BFT-2) secreted in outer membrane vesicles (OMVs) modulates mucosal immunity and CFTR Cl- secretion. Since Bacteroides species often resides in mucus, OMVs are likely to represent a mechanism of communication between Bacteroides and the host. Two strains of Bacteroides were studied, Enterotoxigenic Bacteroides fragilis (ETBF), which produces BFT-2, and the non-toxigenic Bacteroides fragilis strain NCTC 9343 (NTBF) that does not produce BFT-2. We also utilized two additional strains of Bacteroides fragilis: one in which bft-2 was knocked out (ETBF Δbft), and one that was engineered to contain bft-2 (NTBF+bft). We report that most Bacteroides fragilis OMVs reduced CFTR Cl- secretion but had no effect on tight junction or cell adhesion proteins, transepithelial resistance (TER) or cytokine secretion by primary human colon organoids. We conclude that OMVs secreted by Bacteroides can be an important mechanism of host pathogen interactions in the colon by reducing CFTR Cl- secretion.

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short RNA-Seq of Pseudomonas aeruginosa outer membrane vesicles (OMVs) and whole cells

Project description:Characterization of the sRNA content of P. aeruginosa OMVs compared to whole cells. Result: OMVs contain differentially packaged sRNAs. Whole cell PA14 and OMVs from 3 separate preparations.

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Transcriptomic remodeling of gastric cells by Helicobacter pylori Outer Membrane Vesicles

Project description:Helicobacter pylori, a bacterium that colonizes the human stomach, like all Gram-negative bacteria spontaneously shed outer membrane vesicles (OMVs). OMVs, which act as a delivery system for bacterial components, are involved in bacterial-host interactions and thus contribute to pathogenesis. In this study, to understand the gene expression changes that human gastric epithelial cells might undergo when exposed to H. pylori-OMVs, we profiled the transcriptomic changes of the MKN74 gastric cell line induced by OMVs compared to control cells and H. pylori-infected cells, using the Ion AmpliSeq™ Transcriptome Human Gene Expression Panel. The top enriched pathways in the OMVs challenge condition included amino acid-related metabolic pathways, mitogen-activated protein kinase signaling, autophagy, and ferroptosis. The cell cycle, DNA replication, and repair pathways were the top diminished pathways. The transcriptomic changes induced by OMVs were largely consistent with those of the bacteria, although often at low expression levels, suggesting that their effects will mostly reinforce those of the bacterium itself. Our data provide a valuable portrayal of the transcriptomic remodeling of gastric cells by H. pylori-OMVs, which can be further dissected regarding the underlying molecular mediators and explored to understand the pathobiology of the full-spectrum of H. pylori-mediated diseases.

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short RNA-Seq of Pseudomonas aeruginosa outer membrane vesicles (OMVs) and whole cells

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Haemophilus influenzae Outer membrane vesicles inhalation contributes to steroid-resistant asthma

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mRNA transcript distribution bias between Borrelia burgdorferi bacteria and their outer membrane vesicles

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Outer membrane vesicles of carbapenem-resistant Acinetobacter baumannii derive enhanced inflammatory response

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