Project description:Transcriptional profile comparison of the pleural and ascites fluids in hydropic fetuses affected with chylothorax. Two-condition experiment, pleural fluid vs. ascites fluid. Comparison of the transcriptional profile between sample collected before and after OK-432 treatment and between fetuses with and without a G404S mutation in the ITGA9 gene
Project description:Analysis of the effect of human pleural fluid (HPF) or human serum albumin (HSA) on the transcriptome of Acinetobacter baumanii AB5075
Project description:We profiled scRNA-seq of 284 samples collected from 196 individuals, including 22 patients with mild/moderate symptoms, 54 hospitalized patients with severe symptoms, and 95 recovered convalescent persons, as well as 25 healthy controls. The samples were obtained from various tissue types, including human peripheral blood mononuclear cells (249), bronchoalveolar lavage fluid (12) and pleural pleural effusion (1)/sputum (22).
Project description:The opportunistic pathogen A. actinomycetemcomitans (Aa) expereinces fluctuating oxygen levels in its natural habitat, the gingival crevice of the human oral cavity. Since oxygen influences metabolic interactions between Aa and other oral microbes, we sought to characterize oxygen-dependent Aa gene expression.
Project description:Streptococcus pneumoniae is the dominant cause of community-acquired pneumonia world-wide. Invasion of the pleural space is common and results in increased mortality. We set out to determine the bacterial and host factors that influence invasion of the pleural space. In a murine model of pneumococcal infection, we isolated neutrophil-dominated samples of bronchoalveolar and pleural fluid containing bacteria 48 hours after infection. Using dual RNA-seq, we characterised bacterial and host transcripts that were differentially regulated between these compartments and bacteria in broth and resting neutrophils respectively. Pleural and lung samples showed upregulation of genes involved in positive regulation of neutrophil extravasation but down-regulation of genes mediating bacterial killing. Compared to the lung samples, cells within the pleural space showed marked upregulation of many genes induced by type I interferons, cytokines implicated in preventing bacterial transmigration across epithelial barriers. Differences in the bacterial transcripts between the infected samples and bacteria grown in broth showed upregulation of genes in the bacteriocin locus, the pneumococcal surface adhesin PsaA, and the glycopeptide resistance gene, vanZ; the gene encoding the ClpP protease was downregulated in infection. 169 intergenic putative small bacterial RNAs were also identified, of which 43 (25.4%) had been previously described. 42 of the small RNAs were upregulated in pleura compared to broth, including many previously identified as important in virulence. Our results have identified key host and bacterial responses to invasion of the pleural space that can be potentially exploited to develop alternative antimicrobial strategies for prevention and treatment of pneumococcal pleural disease.
Project description:The mammalian immune system is constantly challenged by signals from both pathogenic and non-pathogenic microbes. Many of these non-pathogenic microbes have pathogenic potential if the immune system is compromised. The importance of type I interferons (IFNs) in orchestrating innate immune responses to pathogenic microbes has become clear in recent years. However, the control of opportunistic pathogens – and especially intracellular bacteria – by type I IFNs remains less appreciated. In this study, we use the opportunistic, Gram-negative bacterial pathogen Burkholderia cenocepacia (Bc) to show that type I IFNs are capable of limiting bacterial replication in macrophages, preventing illness in immunocompetent mice. Sustained type I IFN signaling through cytosolic receptors allows for increased expression of autophagy and linear ubiquitination mediators, which slows bacterial replication. Transcriptomic analyses and in vivo studies also show that LPS stimulation does not replicate the conditions of intracellular Gram-negative bacterial infection as it pertains to type I IFN stimulation or signaling. This study highlights the importance of type I IFNs in protection against opportunistic pathogens through innate immunity, without the need for damaging inflammatory responses.
2021-01-19 | GSE165020 | GEO
Project description:Metagenomic and 16S metataxonomic sequencing of pleural fluid
| PRJNA972883 | ENA
Project description:Microecology of pleural fluid in patients with pneumonia
Project description:Background: Malignant pleural effusion (MPE) is a common condition that indicates advanced malignancy, incurability and short life expectancy. While MPE incidence is increasing worldwide, prognostic biomarkers to plan treatment and to understand the underlying mechanisms of disease progression remain unidentified. Objective: To discover, validate, and prospectively assess biomarkers of survival and pleurodesis response in MPE. To combine clinical, radiologic, and pleural fluid biologic parameters in order to build a score that forecasts survival. Conclusions: The PROMISE score is the first prospectively validated prognostic model for MPE that combines biological and clinical parameters to accurately estimate 3-month mortality.