Project description:Salmonella enterica serovar Typhimurium (S. Typhimurium) infection triggers an inflammatory response that changes the concentration of luminal metabolites in the gut, resulting in a distinct environment from a healthy one. We recently demonstrated that S. Typhimurium possesses the ability to form biofilms within the host environment and responds to nitrate as a signaling molecule, enabling it to modulate the transition between sessile and planktonic states. To investigate whether S. Typhimurium utilizes additional metabolites to regulate its behavior, our study delved into the impact of inflammatory metabolites on biofilm formation. Employing a transcriptomic approach we unveiled that lactate enhances the transcription of flagella and invasion genes, highlighting the active role of lactate in modulating the transition of S. Typhimurium from biofilm to motile states. All these findings propose that, as occurring with nitrate, lactate is an inflammatory metabolite being used by S. Typhimurium to support virulence.

2024-10-23 | GSE255285 | GEO

Reduction of alternative electron acceptors drives biofilm formation in Shewanella algae

Project description:Shewanella spp. possess a broad respiratory versatility, which contributes to the occupation of hypoxic/anoxic environmental or host-associated niches. Here we observed a strain-specific induction of biofilm formation in response to supplementation with the anaerobic electron acceptors dimethyl sulfoxide (DMSO) and nitrate in a panel of Shewanella algae isolates. The respiration-driven biofilm response is not observed in DMSO and nitrate reductase deletion mutants of the type strain S. algae CECT 5071, and can be restored upon complementation with the corresponding reductase operon(s) but not by an operon containing a catalytically inactive nitrate reductase. The distinct transcriptional changes, proportional to the effect of these compounds on biofilm formation, include cyclic di-GMP (c-di-GMP) turnover genes. In support, ectopic expression of the c-di-GMP phosphodiesterase YhjH of Salmonella Typhimurium but not its catalytically inactive variant decreased biofilm formation. The respiration-dependent biofilm response of S. algae may permit differential colonization of environmental or host niches.

2020-12-05 | GSE133627 | GEO

The glutathione-disrupted biofilm of clinical Pseudomonas aeruginosa strains: enhanced antibiotic affect and a novel biofilm transcriptome

Project description:Pseudomonas aeruginosa infections for individuals with Cystic Fibrosis (CF), result in high morbidity and mortality, with premature death often occurring. These infections are complicated by the formation of biofilms in the sputum. Antibiotic therapy is stymied by antibiotic resistance of the biofilm matrix, making novel anti-biofilm strategies highly desirable. Within the P. aeruginosa biofilm, the redox factor pyocyanin enhances biofilm integrity by intercalating with extracellular DNA. The antioxidant glutathione (GSH) reacts with pyocyanin to disrupt intercalation. This study investigated GSH disruption by assaying the physiological effects of GSH and DNase I on biofilms of clinical CF isolates grown in artificial CF sputum media (ASMDM+). Confocal scanning laser microscopy showed that 2mM GSH alone or combined with DNase I significantly disrupted the immature (24 hour) biofilms of Australian Epidemic Strain (AES) isogens AES-1R and AES-1M. GSH alone greatly disrupted the mature (72 hour) biofilm of AES-1R, resulting in significant differential expression of 587 genes, as evidenced by RNA-sequencing. Upregulated systems included cyclic diguanylate and pyoverdine biosynthesis, the Type VI secretion system, nitrate metabolism and translational machinery. Physiochemical biofilm disruption with GSH revealed a metabolically active cellular physiology distinct from either mature or dispersed biofilm physiology. RNA-seq results were validated by biochemical assay and qPCR. Biofilms of a range of CF isolates disrupted with GSH and DNase I were significantly more susceptible to ciprofloxacin, and increased antibiotic effectiveness was achieved at 10mM GSH. This study demonstrated that GSH alone or with DNase I represent effective anti-biofilm treatments when combined with appropriate antibiotics.

2016-02-01 | GSE75334 | GEO

biofilm metagenome

Project description:biofilm metagenome Raw sequence reads three carbon sources for denitrification

| PRJNA380320 | ENA

biofilm metagenome

Project description:Drinking water distribution system biofilm samples Metagenome

| PRJNA279206 | ENA

Project description:Microbial community and metabolic mechanism in the start-up period of PHBV solid-phase denitrification process treating high concentration of nitrate mariculture seawater

| PRJNA704773 | ENA

biofilm

Project description:biofilm Metagenome

| PRJNA897103 | ENA