ScRNA-seq and bulk RNA-seq analysis of normoxic and hyperoxic lung in mice [scRNA-seq]
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ABSTRACT:
ORGANISM(S): Mus musculus
PROVIDER: GSE217488 | GEO | 2022/11/07
REPOSITORIES: GEO
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Project description:To explore the key molecules and mechanisms involved in the occurrence and development of BPD by using a hyperoxia-based BPD model in neonatal mice, providing new ideas for discovering new therapeutic target to approach the clinical prevention and treatment for BPD. We performed whole transcriptome sequencing (RNA-seq) profiling analysis of lung endothelial cells from mouse normoxic or hyperoxic mice
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Project description:Bronchopulmonary dysplasia (BPD), a chronic pulmonary sequela of preterm birth, increases susceptibility to respiratory viral infection. Exposure to hyperoxia of neontal mice (a model of BPD) increases the number of activated, IL-12 producing lung CD103+ dendritic cells (DCs) and augments the inflammatory response to rhinovirus infection. We used microarray analysis to detail the effect of hyperoxia on the gene expression of the two main subsets of lung cDC, including CD103+ DCs and CD11bhi DC. We identified distinct up- and down-regulated genes in response to hyperoxia in both cDC subclasses.
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Project description:Transcriptional profiling of P. falciparum comparing parasites exposed to 5% and 21% oxygen environmental conditions in the late ring stage. Two experimental conditions: 5% vs 21%. Biological replicates: 3 normoxia and 3 hyperoxia replicates
2010-06-20 | E-GEOD-18831 | biostudies-arrayexpress
Project description:Oxidative stress (OS), inflammation, and endoplasmic reticulum (ER) stress sequentially occur in the rat model of hyperoxia (HOX) induced bronchopulmonary dysplasia (BPD), and they all increase DNA damage. Tumor suppressors increase after DNA damage, followed by apoptosis or cellular senescence when the damage becomes irreparable. Although cellular senescence contributes to wound healing, its persistence will inhibit growth potential. Therefore, we hypothesized that the persistence of cellular senescence plays a role in BPD progression. We detected evidence of increased cellular senescence in rat and human BPD lungs. Foxo4-p53 binding was increased in BPD rat lungs, and inhibition of this binding attenuated BPD severity, indicating that such binding contributes to BPD's cellular senescence. Treatment with tauroursodeoxycholic acid (TUDCA) decreases ER stress. N-Acetyl-lysyltyrosylcysteine-amide (KYC) reduced toxic oxidant production by myeloperoxidase (MPO) and subsequent OS and inflammation. Both agents effectively decreased cellular senescence. Concomitantly, alveolar complexity and the number of type 2 alveolar cells increased, indicating that MPO-mediated OS and ER stress preceded cellular senescence in BPD rat pup lungs. These data suggest that cellular senescence plays an essential role in BPD progression. Reducing MPO toxic oxidant production, ER stress, and attenuating cellular senescence are potential therapeutic strategies for halting BPD progression. Using multiomic data to investigate the role of cellular senescence in the development of BPD in rat model.
2024-01-01 | GSE223745 | GEO
Project description:Growth Differentiation Factor 15 (GDF15) is a divergent member of the TGF-β superfamily, and its expression increases under various stress conditions, including inflammation, hyperoxia, and senescence. GDF15 expression is increased in neonatal murine BPD models, and GDF15 loss exacerbates oxidative stress and decreases viability in vitro in pulmonary epithelial and endothelial cells. Our overall hypothesis is that the loss of GDF15 will exacerbate hyperoxic lung injury in the neonatal lung in vivo. We exposed neonatal Gdf15-/- mice and wild-type (WT) controls on a similar background to room air or hyperoxia (95% O2) for 5 days after birth. The mice were euthanized on PND 21. Gdf15 -/- mice had higher mortality and lower body weight than WT mice after exposure to hyperoxia. Upon exposure to hyperoxia, female mice had higher alveolar simplification in the Gdf15-/- group than the female WT group. Gdf15-/- and WT mice showed no difference in the degree of the arrest in angiogenesis upon exposure to hyperoxia. Gdf15-/- mice showed lower macrophage count in the lungs compared to WT mice. Our results suggest that Gdf15 deficiency decreases the tolerance to hyperoxic lung injury with evidence of sex-specific differences.
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Project description:The goal of the project was to delineate sex-specific differences in the neonatal lung exposed to postnatal hyperoxia to model the pathophysiologic mechanisms in the human disease; bronchopulmonary dysplasia (BPD).
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Project description:Impaired angiogenesis characterized by the reduced proliferation of pulmonary endothelial cells leads to reduced capillary density in patients with bronchopulmonary dysplasia (BPD). In a mouse model of BPD, perinatal hyperoxic injury decreases the number of the recently identified lung capillary stem cells termed as general capillary (gCap) cells, along with the specific reduction of Ntrk2, which encodes for Tropomyosin receptor kinase B (TRKB) within this subpopulation. Herein, we determine whether TRKB signaling is required for perinatal gCap cell proliferation and further promoting pulmonary angiogenesis using the hyperoxia mouse BPD model. TRKB activation by BDNF treatment led to enhanced tube-forming ability of endothelial cells in vitro. In vivo treatment of mice with BDNF increased the proliferation of gCap cells and alleviated capillary loss caused by hyperoxic injury. Conversely, inhibition of TRKB signaling disrupted the tube formation of endothelial cells and exaggerated the vascular endothelial damage caused by hyperoxia. We further show that MAPK/ERK signaling might act downstream of TRKB to modulate pulmonary angiogenesis. These data indicate that TRKB signaling play a critical role in pulmonary angiogenesis upon perinatal lung injury, supporting the concept that TRKB activation might be a potential therapeutic for preserving endothelial cells for lung diseases associated with prematurity.
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Project description:Bronchopulmonary dysplasia (BPD) is characterized by an arrest in alveolarization, abnormal vascular development and variable interstitial fibroproliferation in the premature lung. Endothelial to mesenchymal transition (Endo-MT) may be a source of pathologic fibrosis in many organ systems. Whether Endo-MT contributes to the pathogenesis of BPD is not known. We tested the hypothesis that pulmonary endothelial cells will show increased expression of Endo-MT markers upon exposure to hyperoxia and that sex as a biological variable will modulate differences in expression. WT and Cdh5-PAC CreERT2 (endothelial reporter) neonatal male and female mice (C57BL6) were exposed to hyperoxia (0.95 FiO2) either during the saccular stage of lung development (95% FiO2; PND1-5) or through the saccular and early alveolar stages of lung development (75% FiO2; PND1-14). Expression of Endo-MT markers were measured in whole lung and endothelial cell mRNA. Sorted lung endothelial cells were subjected to bulk RNA-Seq. We show that exposure of the neonatal lung to hyperoxia leads to upregulation of key markers of EndoMT Neonatal male mice show higher expression of genes related to EndoMT. Furthermore, using lung sc-RNAseq data from neonatal lung we were able to show that xxx. Markers related to Endo-MT are upregulated in the neonatal lung upon exposure to hyperoxia and show sex-specific differences. Mechanisms mediating EndoMT in the injured neonatal lung can modulate the response of the neonatal lung to hyperoxic injury and need further investigation.
2023-11-08 | GSE230672 | GEO
Project description:Previously, we have shown that a synthesized peptide originated from high mobility group box-1 protein (HMGB1) induces a regenerative cascade via activating endogenous mesenchymal stem cells in the body. Here, we have tested whether the HMGB1 peptide can ameliorate BPD related manifestations. In a mouse BPD model established by hyperoxia exposure, three shots of the HMGB1 peptide significantly improved the survival and lung function. Single-cell RNA-seq analysis on the lung showed that an inflammatory signature in macrophages and a fibrotic signature in fibroblasts induced by hyperoxia exposure were significantly suppressed by the HMGB1 peptide. These changes in transcriptome were also confirmed at the protein level. Together, the HMGB1 peptide treatment prevented the progression of BPD by suppressing inflammation and fibrosis. Our data serve as a foundation to develop new effective therapies for BPD.
2024-11-12 | GSE181497 | GEO
Project description:This study examines differential effects of immersion, elevated oxygen partial pressure, and exercise on pulmonary function after series of five daily six-hour dives at 130 kPa (1.3 ATA), with 18 hours between dives. Five cohorts of 10 to 14 divers participated. The exposure phases were resting while breathing O2 or air in the water ("wetO2", "wetAir") or O2 in the hyperbaric chamber ("dryO2"), and exercise in the water while breathing O2 or air ("wetO2X", "wetAirX"). Respiratory symptoms were recorded during and after each dive, and pulmonary function (forced flow-volume) was measured twice at baseline before diving, after each dive both immediately and on the following morning, and three days post diving ("Day+3"). The incidences of symptoms and of flow volume changes from baseline greater than normal limits ("ΔFV") were assessed, as were mean ΔFV. The parameters examined were forced vital capacity (FVC), forced expired volume in 1 second (FEV1), and forced expired flow from 25% to 75% volume expired (FEF25-75). The phases ranked from greatest to least fraction of diver-days with symptoms were wetO2X (56%) > dryO2 (42%) > wetO2 (13%) > [wetAir (2%) or wetAirX (1%)] (p<0.05). FEV1 and FEF25-75 were depressed in the morning following wetO2 and wetO2X and on Day+3 after and wetO2X, but increased immediately following each wetAirX dive. O2 exposures caused symptoms and ΔFV suggestive of pulmonary oxygen toxicity,exacerbated by exercise. Indices of small airway function showed late (17-hour) post-O2 exposure deficits, but, particularly with exercise, improvement was evident early after exposure with or without O2. FEF25-75 and FEV1 remained depressed on Day+3 after wetO2 and wetO2X.
| S-EPMC6128531 | biostudies-literature