Cardiac-dead mouse lungs may remain transplantable at 37ºC for 4 hours if gas exchange is preserved
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ABSTRACT:
PROVIDER: PRJNA647906 | ENA |
REPOSITORIES: ENA
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Project description:Despite a potentially huge number, uncontrolled donation after circulatory death contributed little to alleviating donor lung shortage due to rapidly progressive warm ischemia. Many methods have been studied in animals, but the tolerable warm ischemic time (WIT) remains less than 90 minutes. Using a refined mouse model of pulmonary artery ligation (PAL), we firstly determined the maximum tolerable WIT. 4-hour PAL caused mild lung infiltration without dysfunction upon reperfusion, whereas 5-hour PAL triggered arterial endothelium injury and more significant infiltration with dysfunction. Transcriptional profiling showed a myeloid-dominant inflammation with mild injury in 4-hour PAL. The maximum WIT was then adapted in a clinically relevant scenario. Donor mice died of circulatory arrest without heparization and remained at 37ºC for 4 hours, followed by isogenic transplantation. As observed in 4-hour PAL, nonhypoxic warm ischemia-reperfusion hardly affected graft function and histology, no matter if warm ischemic lung preserved gas exchange by spontaneously breathing or by postmortem protective ventilation. If the dead donors were left untouched, however, the grafted lungs suffered severe hypoxic warm ischemia-reperfusion injury, varying from partially aerated totally lost. Taken together, the retrieval time can be extended to 4 hours at 37ºC by preventing cardiac-dead donor lung hypoxia.
2022-03-30 | GSE154939 | GEO
Project description:Background: HIV infection is associated with impaired gas transfer in the lung as indicated by a low diffusing capacity (DLCO). Mechanisms for reduced DLCO in the setting of HIV infection are not well understood. We hypothesized that HIV-associated gas exchange impairment is indicative of system-wide perturbations that could be reflected by alterations in peripheral blood gene expression. Methods: A total of 40 HIV-infected (HIV+) and uninfected (HIV-) men with preserved versus reduced DLCO were selected from a larger cohort study of lung function. All subjects were current smokers and those with acute illness, lung diseases other than COPD or asthma were excluded. Total RNA was extracted from peripheral blood leukocytes (PBLs) and hybridized to whole-genome microarrays. Gene set enrichment analysis (GSEA) was performed between HIV+ vs. HIV- subjects with preserved DLCO and those with impaired DLCO to identify differentially activated pathways. Results: Using pathway-based analyses we found that in subjects with preserved DLCO, HIV infection is associated with activation of processes involved in immunity, cell cycle, and apoptosis. When we applied a similar analysis to subjects with low DLCO, we identified a much broader repertoire of inflammatory and immune-related pathways in HIV+ patients relative to HIV- subjects, with up-regulation of multiple interleukin pathways, interferon signaling, Toll-like receptor signaling, and T cell/B cell receptor signaling. We confirmed elevated circulating levels of IL-6 in HIV+ patients with reduced DLCO relative to the other groups. Conclusions: Our findings reveal that PBLs of subjects with HIV infection and low DLCO are distinguished by widespread enrichment of immuno-inflammatory programs. Activation of these pathways may alter the biology of circulating leukocytes and play a role in the pathogenesis of HIV-associated pulmonary gas exchange impairment. Total RNA was isolated from peripheral blood leukocytes in four subject groups: 1. HIV-, low DLCO (N = 11); 2. HIV+, low DLCO (N = 10); 3. HIV-, preserved DLCO (N = 9); 4. HIV+, preserved DLCO (N = 9). Each sample was hybridized to an Affymetrix PrimeView Human Gene Expression microarray for a total of 39 experiments.
2016-04-01 | E-GEOD-76403 | biostudies-arrayexpress
Project description:Background: HIV infection is associated with impaired gas transfer in the lung as indicated by a low diffusing capacity (DLCO). Mechanisms for reduced DLCO in the setting of HIV infection are not well understood. We hypothesized that HIV-associated gas exchange impairment is indicative of system-wide perturbations that could be reflected by alterations in peripheral blood gene expression. Methods: A total of 40 HIV-infected (HIV+) and uninfected (HIV-) men with preserved versus reduced DLCO were selected from a larger cohort study of lung function. All subjects were current smokers and those with acute illness, lung diseases other than COPD or asthma were excluded. Total RNA was extracted from peripheral blood leukocytes (PBLs) and hybridized to whole-genome microarrays. Gene set enrichment analysis (GSEA) was performed between HIV+ vs. HIV- subjects with preserved DLCO and those with impaired DLCO to identify differentially activated pathways. Results: Using pathway-based analyses we found that in subjects with preserved DLCO, HIV infection is associated with activation of processes involved in immunity, cell cycle, and apoptosis. When we applied a similar analysis to subjects with low DLCO, we identified a much broader repertoire of inflammatory and immune-related pathways in HIV+ patients relative to HIV- subjects, with up-regulation of multiple interleukin pathways, interferon signaling, Toll-like receptor signaling, and T cell/B cell receptor signaling. We confirmed elevated circulating levels of IL-6 in HIV+ patients with reduced DLCO relative to the other groups. Conclusions: Our findings reveal that PBLs of subjects with HIV infection and low DLCO are distinguished by widespread enrichment of immuno-inflammatory programs. Activation of these pathways may alter the biology of circulating leukocytes and play a role in the pathogenesis of HIV-associated pulmonary gas exchange impairment.
2016-04-01 | GSE76403 | GEO
Project description:Limiting fluid in lung is critical for efficient gas exchange. Here we discovered a mechanism of neuropeptidergic control of lung fluid balance by pulmonary neuroendocrine cells (PNECs), potent sensors of chemical and mechanical cues. We studied the first animal model of neuroendocrine cell hyperplasia of infancy (NEHI), which faithfully recapitulated patient phenotypes including PNEC hyperplasia and impaired gas exchange. Double mutants showed that increased PNECs and excess PNEC products such as CGRP are responsible for poor gas exchange, acting through downregulating endothelial junctions, increasing vessel leakage and fluid accumulation. Endothelium-specific inactivation of CGRP receptor, or treatment with CGRP receptor antagonist reduced fluid and improved gas exchange. In lungs with acute respiratory distress syndrome (ARDS), including those caused by COVID-19, there was a striking increase of CGRP-expressing PNECs. These findings raise the possibility that increased neuropeptides would contribute to excess extravascular lung fluid and antagonizing their function may improve gas exchange.
2022-02-18 | GSE171907 | GEO
Project description:The lung alveolus is the functional unit of the respiratory system required for gas exchange. During the transition to air breathing at birth, biophysical forces are thought to shape the emerging tissue niche. However, the intercellular signaling that drives these processes remain poorly understood. Applying a multimodal approach, we identify alveolar type 1 (AT1) epithelial cells as a distinct signaling hub. Lineage tracing demonstrates that AT1 progenitors align with receptive, force-exerting, myofibroblasts in a spatial and temporal manner. Through single cell chromatin accessibility and pathway expression (SCAPE) analysis, we demonstrate that AT1-restricted ligands are required for myofibroblasts and alveolar formation. These studies show that the alignment of cell fates, mediated by biophysical and AT1-derived paracrine signals, drives the extensive tissue remodeling required for postnatal respiration.
2021-03-11 | GSE149563 | GEO
Project description:Apical progenitors remain multipotent throughout cortical neurogenesis
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Project description:To delineate gene expression levels in whole non-metastatic and metastatic transplantable primary mouse mammary tumour allografts Abstract to be provided from publication
2013-01-01 | GSE42272 | GEO
Project description:Pulmonary Neuroendocrine Cells Regulate Gas Exchange Through Controlling Lung Fluid Balance
| PRJNA721382 | ENA
Project description:Nucleosome exchange in budding yeast
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Project description:Cortical diurnal rhythms remain intact with microglial depletion
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