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The temporal dynamics of differential gene expression in human alveolar epithelial and endothelial cells interacting with the human pathogenic mould Aspergillus fumigatus in vitro

ABSTRACT: Aspergillus fumigatus is the most relevant pathogenic mould in immunocompromised patients. Spores of A. fumigatus are inhaled and reach the lung alveoli, where they interact with the human immune system. In this set of experiments, we co-cultured with defined morphologies of Aspergillus fumigatus (Af293) for 0h, 3h and 6h with either cells representing human alveolar epithelium (A549) or human alveolar endothelium (HPAEC). We included either monocyte-derived or myeloid dendritic cells from volunteer donor blood to the epithelial layer to examine their effect on gene expression. RNA was extracted from both cell lines at each time point and hybridised to microarrays. Microarrays contain probes for approximately 110 selected human immune-relevant genes, including cytokine and chemokine genes, their receptors and downstream innate immunity genes.

ORGANISM(S): Homo sapiens

PROVIDER: GSE28806 | GEO | 2012/04/17

SECONDARY ACCESSION(S): PRJNA143091

REPOSITORIES: GEO

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The temporal dynamics of differential gene expression in human alveolar epithelial and endothelial cells interacting with the human pathogenic mould Aspergillus fumigatus in vitro

Project description:Aspergillus fumigatus is the most relevant pathogenic mould in immunocompromised patients. Spores of A. fumigatus are inhaled and reach the lung alveoli, where they interact with the human immune system. In this set of experiments, we co-cultured with defined morphologies of Aspergillus fumigatus (Af293) for 0h, 3h and 6h with either cells representing human alveolar epithelium (A549) or human alveolar endothelium (HPAEC). We included either monocyte-derived or myeloid dendritic cells from volunteer donor blood to the epithelial layer to examine their effect on gene expression. RNA was extracted from both cell lines at each time point and hybridised to microarrays. Microarrays contain probes for approximately 110 selected human immune-relevant genes, including cytokine and chemokine genes, their receptors and downstream innate immunity genes. We used microarrays to detail the gene expression of human alveloar epithelial and endothelials cells after 3h and 6h of co-cultivation with Aspergillus fumigatus and monocyte-derived or myeloid dendritic cells

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Project description:The cells of the airway epithelium play critical roles in host defense to inhaled irritants, and in asthma pathogenesis. These cells are constantly exposed to conidiospores of the ubiquitous mould Aspergillus fumigatus, which are small enough to reach the alveoli. This exposure is asymptomatic in most individuals but can be associated with a spectrum of diseases ranging from asthma and allergic bronchopulmonary aspergillosis to aspergilloma and invasive aspergillosis. Airway epithelial cells have been shown to internalize A. fumigatus conidiospores in vitro, but the implications of this process for pathogenesis remain unclear. We have developed a cell culture model for this interaction using the 16HBE cell line and a transgenic A. fumigatus strain expressing green fluorescent protein. The transcriptional profiles of A. fumigatus conidiospores incubated in the presence or absence of human cells were compared, revealing significant changes in fungal gene expression in response to conidial interaction with cells. Gene expression levels were investigated in A. fumigatus conidiospores incubated in the presence or absence of 16HBE cells for 6 hours. Four independent samples were analysed for each of these conditions, using JCVI PFGRC Aspergillus fumigatus Version 3 microarrays, with a dye-swap experimental design.

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Project description:The cells of the airway epithelium play critical roles in host defense to inhaled irritants, and in asthma pathogenesis. These cells are constantly exposed to conidiospores of the ubiquitous mould Aspergillus fumigatus, which are small enough to reach the alveoli. This exposure is asymptomatic in most individuals but can be associated with a spectrum of diseases ranging from asthma and allergic bronchopulmonary aspergillosis to aspergilloma and invasive aspergillosis. Airway epithelial cells have been shown to internalize A. fumigatus conidiospores in vitro, but the implications of this process for pathogenesis remain unclear. We have developed a cell culture model for this interaction using the 16HBE cell line and a transgenic A. fumigatus strain expressing green fluorescent protein. Using fluorescence-activated cell sorting (FACS), cells directly interacting with conidiospores and cells not associated with any conidiospores were sorted into separate samples. Transcriptional profiling of these samples using Agilent Whole Human Genome microarrays revealed significant changes in gene expression in response to interaction with conidiospores. The identification of biologically relevant responses validates this methodology, and motivates further work to characterize the interactions between A. fumigatus conidiospores and primary airway epithelial cells of normal and asthmatic origins. Four independent samples of 16HBE cells incubated with GFP-expressing Aspergillus fumigatus conidiospores for 6 hours were analyzed by flow cytometry and divided into negative and positive samples based on the presence of a GFP signal, representing cells with no direct contact with conidiospores and cells directly interacting with conidiospores, respectively. Gene expression was analyzed in these 8 samples using Agilent Whole Human Genome microarrays, with a one-colour experiemntal design.

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Functional genomics of human bronchial epithelial cells directly interacting with conidiospores of Aspergillus fumigatus

Project description:The cells of the airway epithelium play critical roles in host defense to inhaled irritants, and in asthma pathogenesis. These cells are constantly exposed to conidiospores of the ubiquitous mould Aspergillus fumigatus, which are small enough to reach the alveoli. This exposure is asymptomatic in most individuals but can be associated with a spectrum of diseases ranging from asthma and allergic bronchopulmonary aspergillosis to aspergilloma and invasive aspergillosis. Airway epithelial cells have been shown to internalize A. fumigatus conidiospores in vitro, but the implications of this process for pathogenesis remain unclear. We have developed a cell culture model for this interaction using the 16HBE cell line and a transgenic A. fumigatus strain expressing green fluorescent protein. Using fluorescence-activated cell sorting (FACS), cells directly interacting with conidiospores and cells not associated with any conidiospores were sorted into separate samples. Transcriptional profiling of these samples using Agilent Whole Human Genome microarrays revealed significant changes in gene expression in response to interaction with conidiospores. The identification of biologically relevant responses validates this methodology, and motivates further work to characterize the interactions between A. fumigatus conidiospores and primary airway epithelial cells of normal and asthmatic origins.

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