Proteomic analysis of lung tissue from pulmonary ischemia-reperfusion injury in mice
Ontology highlight
ABSTRACT:
ORGANISM(S): Mus Musculus
SUBMITTER: 
Fuxiang Liang
PROVIDER: PXD044899 | iProX | Mon Aug 28 00:00:00 BST 2023
REPOSITORIES: iProX
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Project description:Ischemia-reperfusion injury (IRI) is a well-known model for acute kidney injury (AKI).
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Project description:Experiments in rodents have shown that kidney ischemia/reperfusion injury (IRI) facilitates lung injury and inflammation. To identify potential ischemia-specific lung molecular pathways involved, we conducted global gene expression profiling of lung 6 or 36 hours following 1) bilateral kidney IRI, 2) bilateral nephrectomy (BNx), and 3) sham laparotomy in C57BL/6J mice. Total RNA from whole lung was isolated and hybridized to 430MOEA (22,626 genes) GeneChips (n=3/group). Experiment Overall Design: All procedures were approved by the Johns Hopkins Animal Care and Use Committee, and were consistent with the National Institutes of Health (NIH) Guide for the Care and Use of Laboratory Animals. Male 6-8 week-old mice (C57BL6/J), weighing approximately 25-30 grams were obtained from Jackson Laboratory (Bar Harbor, ME) and housed under pathogen-free conditions according to NIH guidelines at least five days prior to operative procedures. Experiment Overall Design: Animals were placed on a heating blanket and underwent midline laparotomy with isolation of bilateral renal pedicles. For mice assigned to experimental ischemia-reperfusion injury (IRI), a non-traumatic microvascular clamp was applied across both renal pedicles for 60 minutes. After the allotted ischemia time, the clamps were gently removed, the animals administered 1 ml of sterile saline intraperitoneally, and the incision closed in two layers with 4-0 silk suture. The animals were then allowed to recover with free access to food and water. Sham animals underwent the identical procedure without placement of the vascular clamps. The mice assigned to bilateral nephrectomy (BNx) underwent similar procedures except both renal pedicles were ligated with 5-0 silk suture and the kidneys removed. At 6 or 36 hours following the experimental procedure, the mice were euthanized by exsanguination under pentobarbital anesthesia and lung tissues collected for analysis.
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Project description:Hepatic ischemia reperfusion injury is a dynamic process consisting of two stages: ischemia and reperfusion, and triggers a cascade of physiological and biochemical events. Given the important role of microRNAs in regulating gene expression, we analyzed gene expression changes in mouse livers at sham control, ischemia stage, and reperfusion stage. We generated global expression profiles of microRNA and mRNA genes in mouse livers subjected to ischemia reperfusion injury at the three stages, respectively. Comparison analysis showed that reperfusion injury had a distinct expression profile whereas the ischemia sample and the sham control were clustered together. Consistently, there are 69 differentially expressed microRNAs between the reperfusion sample and the sham control whereas 28 differentially expressed microRNAs between the ischemia sample and the sham control. We further identified two modes of microRNA expression changes in ischemia reperfusion injury. Functional analysis of both the differentially expressed microRNAs in the two modes and their target mRNAs revealed that ischemia injury impaired mitochondria function, nutrient consumption, and metabolism process. In contrast, reperfusion injury led to severe tissue inflammation that is predominantly an innate-immune response in the ischemia reperfusion process. Our staged analysis of gene expression profiles provides new insights into regulatory mechanisms of microRNAs in mouse hepatic ischemia reperfusion injury.
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Project description:This study was a part of a larger study assessing the response of young pigs to cardiac ischemia/reperfusion (IR) injury. A mild cardiac injury approach (IR) was used in post-weaned pigs (1-month), to assess regenerative repair in young large mammals after transient ischemic injury. Female and male postnatal day (P)30 pigs were subjected to cardiac ischemia (1-hour) by occlusion of the left anterior descending artery followed by reperfusion (IR), or to sham operation. In pigs subjected to IR, myocardial damage occurred, indicated by increased circulating cardiac troponin I 2-hours post-ischemia. In addition, cardiac ejection fraction (EF) was significantly decreased 2-hours post-ischemia and reduced EF was maintained to the 4-week study end-point. Histology demonstrated evidence of CM cell cycling at 2-months of age in multinucleated CMs in both sham-operated and IR pigs. Following IR, regional scar formation and inflammation in the epicardial region proximal to injury were observed 4-weeks post-IR. Sex differences in cardiac function and collagen deposition were found, highlighting the importance of representing both sexes in cardiac injury studies. Together, our results describe an effective novel cardiac injury model in 1-month old swine, at a time when CM are still cycling. However, pigs subjected to IR show a prolonged decrease in cardiac function, and the formation of a small, regional scar with increased inflammation. Together, these data demonstrate that 1-month old pigs do not regenerate myocardium, but form a scar, after transient IR injury.
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Project description:Ischemia-reperfusion injury (IRI) is a major cause of morbidity and mortality following conventional lung transplantation and warm ischemia may limit success of transplanting lungs from non-heart-beating donors. We sought to determine alterations in gene expression in rat lung tissue subjected to warm ischemia in vivo followed by reperfusion. Keywords: time course
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