Canonical WNT pathway is activated in the airway epithelium in chronic obstructive pulmonary disease
Ontology highlight
ABSTRACT:
PROVIDER: PRJNA650402 | ENA |
REPOSITORIES: ENA
Dataset's files
| Action | DRS | |||
|---|---|---|---|---|
| SRR12372000.fastq.gz | Fastqsanger.gz | |||
| SRR12372001.fastq.gz | Fastqsanger.gz | |||
| SRR12372002.fastq.gz | Fastqsanger.gz | |||
| SRR12372003.fastq.gz | Fastqsanger.gz | |||
| SRR12372004.fastq.gz | Fastqsanger.gz |
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Project description:We report that the canonical WNT pathway is upregulated in the proximal epithelium of patients with chronic obstructive pulmonary disease. Our data were obtained by using redifferentiated airway epithelium in air/liquid interface, and sequencing the transcriptional activity of components of the WNT signalling pathway
2020-08-04 | GSE155588 | GEO
Project description:BackgroundChronic obstructive pulmonary disease (COPD) is a devastating lung disease, mainly due to cigarette smoking, which represents the third cause of mortality worldwide. The mechanisms driving its epithelial salient features remain largely elusive. We aimed to evaluate the activation and the role of the canonical, β-catenin-dependant WNT pathway in the airway epithelium from COPD patients.MethodsThe WNT/β-catenin pathway was first assessed by WNT-targeted RNA sequencing of the air/liquid interface-reconstituted bronchial epithelium from COPD and control patients. Airway expression of total and active β-catenin was assessed in lung sections, as well as WNT components in laser-microdissected airway epithelium. Finally, we evaluated the role of WNT at the bronchial epithelial level by modulating the pathway in the reconstituted COPD epithelium.FindingsWe show that the WNT/β-catenin pathway is upregulated in the COPD airway epithelium as compared with that of non-smokers and control smokers, in targeted RNA-sequencing of in vitro reconstituted airway epithelium, and in situ in lung tissue and laser-microdissected epithelium. Extrinsic activation of this pathway in COPD-derived airway epithelium inhibited epithelial differentiation, polarity and barrier function, and induced TGF-β-related epithelial-to-mesenchymal transition (EMT). Conversely, canonical WNT inhibition increased ciliated cell numbers, epithelial polarity and barrier function, whilst inhibiting EMT, thus reversing COPD features.InterpretationIn conclusion, the aberrant reactivation of the canonical WNT pathway in the adult airway epithelium recapitulates the diseased phenotype observed in COPD patients, suggesting that this pathway or its downstream effectors could represent a future therapeutic target.FundingThis study was supported by the Fondation Mont-Godinne, the FNRS and the WELBIO.
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Project description:The proximal-distal patterning program determines unique structural and functional properties of proximal and distal airways in the adult lung. Based on the knowledge that remod-eling of distal airways is the major pathologic feature of chronic obstructive pulmonary disease (COPD), and that small airway epithelium (SAE), which covers distal airways, is the primary site of the initial smoking-induced changes relevant to COPD pathogenesis, we hypothesized that in COPD smokers, the SAE transcriptome loses its region-specific biologic identity and takes on the transcriptional pattern of the proximal airways. By analyzing human airway epithelium col-lected by bronchoscopic brushings from proximal and distal airways of healthy smokers, proxi-mal and distal airway epithelial transcriptome signatures were identified. Dramatic smoking-dependent suppression of distal signature paralleled by acquisition of the proximal airway epithe-lial phenotype was found in the SAE of COPD smokers. Distal-proximal re-patterning observed in the SAE of smokers in vivo was reproduced in vitro by stimulating SAE basal cells (BC), the stem/progenitor cells of the SAE, with EGF, a growth factor up-regulated in airway epithelium by smoking. Together, this study identifies distal-proximal SAE re-patterning as a characteristic feature of small airway disordering in COPD smokers potentially driven by EGF/EGFR-mediated reprogramming of SAE BC stem/progenitor cells.
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Project description:There is a gradient of M-NM-2-catenin expression along the colonic crypt axis with the highest levels at the crypt bottom. However, it remains unclear whether different levels of canonical Wnt signaling exert distinct roles in the colonic epithelium. In the present study, we first showed that the canonical Wnt signaling is active in the proliferative compartment of normal colonic crypts by separating actively proliferating progenitor cells from non-proliferating cells in the colon using transgenic mice expressing a histone H2B-green fluorescent protein (GFP) fusion protein under the control of a tetracycline responsive regulatory element. Subsequently, we investigated the dose-dependent effect of canonical Wnt activation on colonic epithelial differentiation by controlling the expression levels of stabilized M-NM-2-catenin using a doxycycline-inducible transgenic system in mice. We show that elevated levels of Wnt signaling induce the amplification of Lgr5+ cells, which is accompanied by crypt fission and a reduction in cell proliferation among progenitor cells. In contrast, lower levels of M-NM-2-catenin induction enhanced cell proliferation rates of epithelial progenitors without affecting crypt fission rates. Notably, slow-cycling cells produced by M-NM-2-catenin activation exhibit activation of Notch signaling and the treatment of M-NM-2-catenin expressing mice with a Notch inhibitor turned such slow-cycling cells into actively proliferating cells. Our results indicate that the activation of the canonical Wnt signaling pathway is sufficient for de novo crypt formation, and suggest that different levels of canonical Wnt activations, in cooperation with Notch signaling, establish a hierarchy of slower-cycling stem cells and faster-cycling progenitor cells characteristic for the colonic epithelium. To separate actively proliferating cells from non-proliferating cells in normal colon, we used transgenic mice expressing a histone H2B-GFP fusion protein under the control of a tetracycline responsive regulatory element (H2B-GFP mice). In H2B-GFP mice, all colonic crypt cells exhibited strong nuclear GFP signal 7 days after doxycycline administration. When doxycycline was withdrawn for 2 days after the labeling period, nuclear GFP signal was diluted in proliferating cells whereas non-proliferating cells retained GFP. GFPhigh non-proliferating and GFPlow proliferating epithelial cells were sorted from the isolated crypts by FACS for microarray analysis. In addition, to investigate the effects of acute Wnt activation in colon, we generated doxycycline-inducible M-NM-2-catenin mice. Colonic crypts were isolated from untreated mice and mice fed doxycycline in the drinking water (2.0 mg/ml) for 5 days and subjected to microarray analysis.
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Project description:<p>The mechanistic role of the airway microbiome in chronic obstructive pulmonary disease (COPD) remains largely unexplored. We present a landscape of airway microbe-host interactions in COPD by an in-depth profiling of sputum metagenome, metabolome, host transcriptome and proteome from 99 COPD patients and 36 healthy individuals. Multi-omic data were integrated using a sequential mediation analysis, to assess in silico associations of the microbiome with neutrophilic or eosinophilic inflammation, two primary COPD inflammatory endotypes, mediated through microbial metabolic interaction with host gene expression. Mechanistic links of microbiome-metabolite-host interaction were identified leveraging microbial genetic information and established metabolite-human gene pairs. The strongest link for neutrophil-predominant COPD was altered tryptophan metabolism driven by airway lactobacilli resulting in reduced indole-3-acetic acid (IAA), which was in turn linked to perturbed host IL-22 signaling and epithelial cell apoptosis pathways. In vivo and in vitro studies showed that airway microbiome-derived IAA mitigates neutrophilic inflammation, apoptosis, emphysema, and lung function decline, via IL-22-mediated macrophage-epithelial cell crosstalk. Intranasal inoculation of two airway lactobacilli restored IAA and recapitulated its protective effects in mice. These findings provide the rationale for therapeutically targeting microbe-host interaction in COPD.</p><p><br></p><p><strong>Linked studies:</strong></p><p><strong>UPLC-MS/MS assays</strong> of original cohort human samples are reported in this study.</p><p><strong>UPLC-MS/MS assays</strong> of more recent cohort human samples are reported in <a href='https://www.ebi.ac.uk/metabolights/MTBLS5423' rel='noopener noreferrer' target='_blank'><strong>MTBLS5423</strong></a>.</p><p><strong>UPLC-MS/MS assays</strong> of more recent murine samples are reported in <a href='https://www.ebi.ac.uk/metabolights/MTBLS6894' rel='noopener noreferrer' target='_blank'><strong>MTBLS6894</strong></a>.</p>
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Project description:There is a gradient of β-catenin expression along the colonic crypt axis with the highest levels at the crypt bottom. However, it remains unclear whether different levels of canonical Wnt signaling exert distinct roles in the colonic epithelium. In the present study, we first showed that the canonical Wnt signaling is active in the proliferative compartment of normal colonic crypts by separating actively proliferating progenitor cells from non-proliferating cells in the colon using transgenic mice expressing a histone H2B-green fluorescent protein (GFP) fusion protein under the control of a tetracycline responsive regulatory element. Subsequently, we investigated the dose-dependent effect of canonical Wnt activation on colonic epithelial differentiation by controlling the expression levels of stabilized β-catenin using a doxycycline-inducible transgenic system in mice. We show that elevated levels of Wnt signaling induce the amplification of Lgr5+ cells, which is accompanied by crypt fission and a reduction in cell proliferation among progenitor cells. In contrast, lower levels of β-catenin induction enhanced cell proliferation rates of epithelial progenitors without affecting crypt fission rates. Notably, slow-cycling cells produced by β-catenin activation exhibit activation of Notch signaling and the treatment of β-catenin expressing mice with a Notch inhibitor turned such slow-cycling cells into actively proliferating cells. Our results indicate that the activation of the canonical Wnt signaling pathway is sufficient for de novo crypt formation, and suggest that different levels of canonical Wnt activations, in cooperation with Notch signaling, establish a hierarchy of slower-cycling stem cells and faster-cycling progenitor cells characteristic for the colonic epithelium.
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