Functional and Lymphocytic Markers of Respiratory Morbidity in Hyperoxic Preemies
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PROVIDER: PRJNA374916 | ENA |
REPOSITORIES: ENA
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Project description:Functional and Lymphocytic Markers of Respiratory Morbidity in Hyperoxic Preemies
| PRJNA374917 | ENA
Project description:<p>Approximately 550,000 babies born prematurely each year in the United States suffer from birth at a time in development when the respiratory tract and immune system would normally be protected and maintained in a naïve state. This project is a component of the NIH Prematurity and Respiratory Outcomes Program (PROP) whose goals are the identification of disease mechanisms and biomarkers to stratify premature infants, at the time of discharge, for their risk of subsequent pulmonary morbidity. This Clinical Research Center (CRC) project will investigate prematurity-dependent alterations in cellular innate and adaptive immune systems resulting in increased susceptibility to respiratory infections and environmental irritants, and leading to respiratory morbidity in the first year of life. Prior studies have established developmental (maturity) and disease-related changes in circulating and pulmonary lymphocyte populations, but a comprehensive assessment of their relationship to disease risk/outcome has not been undertaken. We hypothesize that cellular and molecular immuno-maturity is altered due to intrinsic and extrinsic factors presented by premature birth in such a way as to reduce resistance to viral infections and to promote cytotoxic damage to the lung. We will evaluate immunologic maturity by comprehensively phenotyping lymphocyte populations in peripheral blood sampled at premature delivery, at the time of discharge from the hospital and at twelve months corrected age. The lymphocytic phenotype will be analyzed particularly in the context of gestational age and maternal-fetal stressors capable of modulating oxidative stress (oxygen exposure, infection and environmental tobacco smoke exposure). Additionally, we will assess changes in the molecular phenotype of isolated CD8 lymphocytes, a cell type preferentially recruited to the lungs of premature infants and capable of contributing to disease pathogenesis, by genome-wide expression profiling, in order to uncover novel disease pathways and define a gene expression signature associated with disease risk. We propose to build a statistical model, using cellular and molecular phenotypes and additional clinical variables, for stratifying risk of lung morbidity within the first year of life. Finally, we will assess the development of the gut microbiome in the preterm subjects to correlate with the observation of development of the adaptive immune system.</p>
| phs001297 | dbGaP
Project description:Nrf2 is a transcription factor that binds to antioxidant response elements of the regulatory region of a number of antioxidant genes. A mutation in the Nrf2 gene increases susceptibility to hyperoxic lung injury. This project examines expression differences between wild type and Nrf2 knock out mice with the hope of providing insight to the downstream effector genes regulated by Nrf2. Keywords: other
2003-07-16 | GSE495 | GEO
Project description:Role and diagnostic performance of host epigenome in respiratory morbidity after RSV infection: the EPIRESVi study
| PRJNA819413 | ENA
Project description:To determine cardiac transcription profile in cyanotic Tetralogy of Fallot patients subjected to hyperoxic/standard cardiopulmonary bypass, we collected myocardial samples at the end of the ischemic time. The transcriptional profile of the mRNA in these samples was measured with gene array technology Myocardial samples were collected at the end of ischemic time from cyanotic Tetralogy of Fallot patients undergoing corrective surgery using hyperoxic/standard cardiopulmonary bypass
2012-12-06 | E-GEOD-38161 | biostudies-arrayexpress
Project description:Background: Obesity has become a worldwide concern. Acute respiratory distress syndrome (ARDS) comprises 10.4% of total intensive care unit admissions and is associated with very high mortality. ARDS incidence is increased in obese patients. Exposure of rodents to hyperoxia mimics many of the clinical and pathologic features observed in patients with ARDS. The aim of this study was to determine the impact of high fat diet-induced obesity on the susceptibility to hyperoxic acute lung injury in mice. Methods: Male C57BL/6 mice received 60% fat versus ingredient matched 10% fat diet. Mice were exposed to >95% oxygen to induce lung damage. RNA was isolated from lung homogenates and by comparing RNA sequencing results with mouse Mitocarta, an inventory of genes encoding proteins with mitochondrial localization, we identified fatty acid synthase (FASN), an enzyme catalyzing de novo fatty acid synthesis, as one of the mitochondrial genes significantly changed with diet and with hyperoxia. We generated mice deficient in FASN in alveolar epithelial cells by using a tamoxifen inducible Cre recombinase construct (FASNflox/flox SPC Cre+/-) and subjected them to hyperoxia and high fat diet. Results: Mice receiving 60% fat diet had significantly higher weight, serum cholesterol and fasting glucose. High fat diet mice had significantly reduced survival and increased lung damage, as assessed by BAL protein and LDH, histology and TUNEL staining. By RNA sequencing of lung homogenates we identified FASN as one of the mitochondrial genes significantly reduced in mice receiving 60% compared to 10% fat diet and further reduced with hyperoxia. We confirmed that FASN protein levels in the lung of high fat diet mice were lower by immunoblotting and immunohistochemistry. After 48 hours of hyperoxia FASNflox/flox SPC Cre+/- mice displayed increased levels of BAL protein and LDH and more severe histologic lung injury. FASNflox/flox SPC Cre+/- mice remained more prone to lung injury after hyperoxic exposure even when they received 60% fat diet. Conclusions: These results demonstrate that obesity increases the severity of hyperoxia induced acute lung injury in mice by altering FASN levels in the lung of high fat diet fed rodents. To our knowledge, this is the first study to show that high fat diet leads to altered FASN expression in the lung and that both high fat diet and reduced FASN in alveolar epithelial cells lead to increased lung injury under hyperoxic conditions.
2019-07-25 | GSE123938 | GEO
Project description:Cellular senescence in hyperoxic neonatal rat lung
| PRJNA1013085 | ENA
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.
2023-07-20 | GSE211744 | GEO
Project description:Role of Gdf15 in neonatal hyperoxic lung injury
| PRJNA871940 | ENA
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.
2024-09-15 | GSE276575 | GEO