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Microbial metabolic reprogramming regulates intraspecific competition of Enterobacteriaceae in the inflamed gut

ABSTRACT: Microbial metabolic reprogramming regulates intraspecific competition of Enterobacteriaceae in the inflamed gut

PROVIDER: PRJNA416785 | ENA |

REPOSITORIES: ENA

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Microbial metabolic reprogramming regulates intraspecific competition of Enterobacteriaceae in the inflamed gut

Project description:Imbalance in beneficial and harmful bacteria underlies gastrointestinal diseases, such as inflammatory bowel disease. Here, we demonstrated that certain E. coli strains, specifically adherent-invasive E. coli (AIEC), utilize a serine metabolism pathway to outcompete other E. coli strains in the inflamed gut. In contrast, amino acid metabolism has a minimal effect on their competitive fitness in the healthy gut. The availability of luminal serine used for the competition of E. coli is largely dependent on dietary intake, as the inflammation-induced blooms of AIEC are significantly blunted when amino acids, particularly serine, are removed from the diet. Thus, intestinal inflammation regulates the intraspecific competition between Enterobacteriaceae by eliciting their metabolic reprogramming.

2019-09-06 | GSE106412 | GEO

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Project description:Patient-derived intestinal organoids provide an excellent tool to unravel mechanisms underlying ulcerative colitis (UC). Fresh biopsies, to isolate crypts and culture organoids, were obtained from both inflamed and non-inflamed regions from eight patients with active UC (Mayo endoscopic subscore ≥2), and from eight non-IBD controls.To address the inflammatory character of ex vivo organoids, we compared the transcriptome of biopsies, crypts and organoids derived from inflamed, and non-inflamed regions and aimed to (re-)induce inflammation ex vivo.

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First dataset - bacterial proteome of carbapanemase-producing Escherichia coli and other Enterobacteriaceae under antibiotic pressure

Project description:Antibiotic resistance associated with the expression of the clinically significant carbapenemases, IMP, KPC, and NDM and OXA-48 in Enterobacteriaceae is emerging as a worldwide calamity to health care. In Australia, IMP-producing Enterobacteriaceae is the most prevalent carbapenemase-producing Enterobacteriaceae (CPE). Genomic characteristics of such carbapenemase-producing Enterobacteriaceae (CPE) are well described, but the corresponding proteome is poorly characterised. We have thus developed a method to analyse dynamic changes in the proteome of CPE under antibiotic pressure. Specifically, we have investigated the effect of meropenem at sub-lethal concentrations to develop a better understanding of how antibiotic pressure leads to resistance. Escherichia coli, producing either NDM, IMP or KPC type carbapenemase were included in this study, and their proteomes were analysed in growth conditions with or without meropenem.

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