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ABSTRACT:
PROVIDER: PRJNA208972 | ENA |
REPOSITORIES: ENA
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Project description:Aryl hydrocarbon receptor senses bacterial pigmented virulence factors and orchestrates anti-bacterial defenses (part 1)
| PRJNA208973 | ENA
Project description:Aryl hydrocarbon receptor senses bacterial pigmented virulence factors and orchestrates anti-bacterial defenses (part 2)
| PRJNA209088 | ENA
Project description:The aryl hydrocarbon receptor (AhR) is a highly conserved ligand-dependent transcription factor that senses environmental toxins and endogenous ligands, thereby inducing detoxifying enzymes and modulating immune cell differentiation and responses. We hypothesized that AhR not only evolved to sense pollutants from the environment, but also insults of microbial origin. We demonstrate that bacterial pigmented virulence factors, namely the phenazines pyocyanin and 1-hydroxyphenazine from Pseudomonas aeruginosa and the naphthoquinone phthiocol from Mycobacterium tuberculosis, are ligands of AhR. AhR activation leads to degradation of these virulence factors and regulated cytokine and chemokine production. The relevance of AhR to host defense is underlined by heightened susceptibility of AhR-deficient mice, both to P. aeruginosa and M. tuberculosis. Our data demonstrate that AhR senses distinct bacterial virulence factors and controls anti-bacterial responses. We provide evidence for a previously unidentified role for AhR as an intracellular pattern recognition receptor, and identify bacterial pigmented virulence factors as a new class of pathogen-associated molecular patterns.
2014-01-01 | GSE48132 | GEO
Project description:The aryl hydrocarbon receptor (AhR) is a highly conserved ligand-dependent transcription factor that senses environmental toxins and endogenous ligands, thereby inducing detoxifying enzymes and modulating immune cell differentiation and responses. We hypothesized that AhR not only evolved to sense pollutants from the environment, but also insults of microbial origin. We demonstrate that bacterial pigmented virulence factors, namely the phenazines pyocyanin and 1-hydroxyphenazine from Pseudomonas aeruginosa and the naphthoquinone phthiocol from Mycobacterium tuberculosis, are ligands of AhR. AhR activation leads to degradation of these virulence factors and regulated cytokine and chemokine production. The relevance of AhR to host defense is underlined by heightened susceptibility of AhR-deficient mice, both to P. aeruginosa and M. tuberculosis. Our data demonstrate that AhR senses distinct bacterial virulence factors and controls anti-bacterial responses. We provide evidence for a previously unidentified role for AhR as an intracellular pattern recognition receptor, and identify bacterial pigmented virulence factors as a new class of pathogen-associated molecular patterns.
2014-01-01 | GSE48130 | GEO
Project description:The aryl hydrocarbon receptor (AhR) is a highly conserved ligand-dependent transcription factor that senses environmental toxins and endogenous ligands, thereby inducing detoxifying enzymes and modulating immune cell differentiation and responses. We hypothesized that AhR not only evolved to sense pollutants from the environment, but also insults of microbial origin. We demonstrate that bacterial pigmented virulence factors, namely the phenazines pyocyanin and 1-hydroxyphenazine from Pseudomonas aeruginosa and the naphthoquinone phthiocol from Mycobacterium tuberculosis, are ligands of AhR. AhR activation leads to degradation of these virulence factors and regulated cytokine and chemokine production. The relevance of AhR to host defense is underlined by heightened susceptibility of AhR-deficient mice, both to P. aeruginosa and M. tuberculosis. Our data demonstrate that AhR senses distinct bacterial virulence factors and controls anti-bacterial responses. We provide evidence for a previously unidentified role for AhR as an intracellular pattern recognition receptor, and identify bacterial pigmented virulence factors as a new class of pathogen-associated molecular patterns. Microarray experiments were performed as single-color hybridizations. Quality control and quantification of total RNA amount was assessed using an Agilent 2100 Bioanalyzer (Agilent Technologies) and a NanoDrop 1000 spectrophotometer (Kisker).
2014-01-01 | E-GEOD-48130 | biostudies-arrayexpress
Project description:The aryl hydrocarbon receptor (AhR) is a highly conserved ligand-dependent transcription factor that senses environmental toxins and endogenous ligands, thereby inducing detoxifying enzymes and modulating immune cell differentiation and responses. We hypothesized that AhR not only evolved to sense pollutants from the environment, but also insults of microbial origin. We demonstrate that bacterial pigmented virulence factors, namely the phenazines pyocyanin and 1-hydroxyphenazine from Pseudomonas aeruginosa and the naphthoquinone phthiocol from Mycobacterium tuberculosis, are ligands of AhR. AhR activation leads to degradation of these virulence factors and regulated cytokine and chemokine production. The relevance of AhR to host defense is underlined by heightened susceptibility of AhR-deficient mice, both to P. aeruginosa and M. tuberculosis. Our data demonstrate that AhR senses distinct bacterial virulence factors and controls anti-bacterial responses. We provide evidence for a previously unidentified role for AhR as an intracellular pattern recognition receptor, and identify bacterial pigmented virulence factors as a new class of pathogen-associated molecular patterns. Microarray experiments were performed as dual-color hybridizations. To compensate for dye-specific effects, a dye-reversal color-swap was applied. Quality control and quantification of total RNA amount was assessed using an Agilent 2100 Bioanalyzer (Agilent Technologies) and a NanoDrop 1000 spectrophotometer (Kisker).
2014-01-01 | E-GEOD-48132 | biostudies-arrayexpress
Project description:Pseudomonas aeruginosa, the type species of the Pseudomonas genus, is an environmental Gram negative bacterium, well-known for its ability to produce toxins, resist antibiotics, and opportunistically colonize various niches, including invertebrate and vertebrate hosts. P. aeruginosa produces redox active secondary metabolites called phenazines involved in quorum sensing, biofilm formation, virulence, and iron acquisition. Moreover, these colorful pigmented virulence factors act as ligands for the highly conserved aryl hydrocarbon receptor (AhR) thereby regulating antibacterial defenses in vertebrates. Pseudomonas spp. are some of the most frequently identified bacteria in larval and adult stages of wild mosquito populations. Here we investigated global transcriptional changes induced in A. coluzzii third instar larvae incubated with a sublethal concentration (50 µM) of 1-hydroxyphenazine (1-HP) or pyocyanin (Pyo) at 4 h and 8 h of continuous incubation by whole-genome DNA microarrays.
2018-03-01 | GSE89829 | GEO
Project description:Pattern recognition of bacterial products by host receptors is essential for pathogen sensing in many metazoans. Caenorhabditis elegans, however, do not utilize canonical pattern recognition receptors to activate innate immunity toward bacterial pathogens. Whether other mechanisms evolved in nematodes to directly sense pathogens is not known. Here, we characterize the first bacterial pattern recognition receptor and its natural ligand in C. elegans. We show that the C. elegans nuclear hormone receptor NHR-86/HNF4 senses phenazine-1-carboxamide (PCN), a metabolite produced by pathogenic strains of Pseudomonas aeruginosa, to activate protective anti-pathogen defenses in the intestine. PCN binds to the ligand binding domain of NHR-86/HNF4, a ligand-gated transcription factor, which engages a transcriptional program in intestinal epithelial cells that promotes metabolism of toxic phenazines to provide protection against P. aeruginosa. These data de-orphan a nuclear hormone receptor and demonstrate that sensing a metabolite signal of bacterial virulence allows nematodes to detect pathogens in its environment that are poised to cause disease.
2023-02-07 | GSE202258 | GEO
Project description:The transcriptional program of early embryonic development is tightly regulated by a set of well-defined transcription factors that suppress premature expression of differentiation genes and sustain the pluripotent identity. It is generally accepted that this program can be perturbed by environmental factors such as chemical pollutants, however the precise molecular mechanisms remain unknown. The Aryl Hydrocarbon Receptor (AHR) is a widely expressed nuclear receptor that senses environmental stimuli and modulates target gene expression. Here, we show that ectopic activation of AHR during early differentiation disrupts the differentiation program via the chromatin remodeling complex NuRD. The activated AHR/NuRD complex altered the expression of differentiation-specific genes that control the first two developmental decisions without affecting the pluripotency program. These findings identify a novel mechanism that allows environmental stimuli to disrupt embryonic development through AHR signaling.
2018-02-26 | PXD006089 | Pride
Project description:This SuperSeries is composed of the following subset Series: GSE15857: The Aryl Hydrocarbon Receptor Regulates Tissue-Specific Dioxin-Dependent and Dioxin-Independent Gene Batteries: Kidney GSE15858: The Aryl Hydrocarbon Receptor Regulates Tissue-Specific Dioxin-Dependent and Dioxin-Independent Gene Batteries: Liver Refer to individual Series
2010-05-05 | E-GEOD-15859 | biostudies-arrayexpress