Single-cell RNA-seq of human liver samples
Ontology highlight
ABSTRACT:
ORGANISM(S): Homo sapiens
PROVIDER: GSE216584 | GEO | 2023/02/15
REPOSITORIES: GEO
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Project description:Normothermic machine perfusion (NMP) after static cold storage is increasingly used for preservation and assessment of human donor livers prior to transplantation. Biliary viability assessment during NMP reduces the risk of post-transplant biliary complications. However, understanding molecular changes in the biliary system during NMP remains incomplete. Here, we performed RNA-seq analysis of donor livers undergoing NMP treatment and compared livers with biliary viability scores that were acceptable for transplantation vs those that were not.
2023-11-21 | E-MTAB-13501 | biostudies-arrayexpress
Project description:Acute rejection remains an important risk factor affecting the survival of recipients following transplantation. Bone marrow mesenchymal stem cells (BMMSCs) are used in the treatment of organ transplantation due to their immunomodulatory ability. BMMSCs were isolated from rat bone marrow and modified with the adenovirus for heme oxygenase 1 (HO-1) gene. Saline solution, BMMSCs or HO-1/BMMSCs were perfused into the donor liver in vitro using a normothermic machine perfusion (NMP) system, followed by liver transplantation. The liver grafts were collected at 7 days post-transplantation. Gene chip technology was used to detect differential gene expression.
2021-03-02 | GSE167980 | GEO
Project description:Access to liver transplantation is limited by a significant organ shortage. The recent introduction of machine perfusion technology allows surgeons to monitor and assess ex situ liver function prior to transplantation. However, many donated organs are of inadequate quality for transplant, though opportunities exist to rehabilitate organ function with adjunct therapeutics during normothermic machine perfusion. In this preclinical study, we targeted the apoptosis pathway as a potential method of improving hepatocellular function. Treatment of discarded human livers during normothermic perfusion with an irreversible pan-caspase inhibitor, emricasan, resulted in significant mitigation of ischemia-reperfusion injury at both the transcriptional and protein level. This was evidenced by significantly decreased circulating levels of the pro-inflammatory cytokines, interleukin-6, interleukin-8, and interferon-gamma, compared to control livers. Untreated livers also demonstrated transcriptional changes notable for enrichment in pathways involved in innate immunity, leukocyte migration, and cytokine-mediated signaling. Targeting of unregulated apoptosis may represent a viable therapeutic intervention for rehabilitating liver hepatocellular function during machine perfusion.
2022-07-11 | GSE202565 | GEO
Project description:We describe a proteomics analysis to determine the molecular differences between normothermically perfused (normothermic machine perfusion, NMP) human kidneys with urine recirculation (URC) and urine replacement (UR). Proteins were extracted from 16 kidney biopsies with URC (n=8 donors after brain death (DBD), n=8 donors after circulatory death (DCD)) and three with UR (n=2 DBD, n=1 DCD), followed by quantitative analysis by mass spectrometry. Damage-associated molecular patterns (DAMPs) were decreased in kidney tissue after six hours NMP with URC, suggesting reduced inflammation. Vasoconstriction was also attenuated in kidneys with URC as angiotensinogen levels were reduced. Strikingly, kidneys became metabolically active during NMP, which could be enhanced and prolonged by URC. For instance, mitochondrial succinate dehydrogenase enzyme levels as well as carbonic anhydrase were enhanced with URC, contributing to pH stabilisation. Levels of cytosolic and the mitochondrial phosphoenolpyruvate carboxykinase were elevated after 24 hours of NMP, more prevalent in DCD than DBD tissue. Key enzymes involved in glucose metabolism were also increased after twelve and 24 hours of NMP with URC, including mitochondrial malate dehydrogenase and glutamic-oxaloacetic transaminase, predominantly in DCD tissue. We conclude that NMP with URC permits prolonged preservation and revitalises metabolism to possibly minimize better cope with ischemia reperfusion injury in discarded kidneys.
2020-10-20 | PXD021507 | Pride
Project description:Background and Aims: Liver transplantation provides an effective cure for end-stage liver disease but is hampered by a severe organ shortage. Normothermic machine perfusion (NMP) of donor livers allows dynamic preservation in addition to viability assessment prior to transplantation. Little is known about the injury and repair mechanisms induced during NMP. Therefore, we examined gene and protein expression changes in a cohort of discarded human livers during NMP, stratified by liver viability. Approach and Results: 6 human livers from donation after circulatory death (DCD) underwent 12 hours of NMP, of which 3 met viability criteria. We applied bulk transcriptomics to evaluate differences in gene expression relating to injury, repair, and regenerative responses among livers based on viability. Viable livers demonstrated robust activation of innate immunity after 3 hours of NMP followed by enrichment of pro-repair and pro-survival mechanisms. Nonviable livers demonstrated delayed and persistent enrichment of innate immune responses. Viable livers demonstrated effective induction of autophagy, the cellular repair and homeostasis pathway, compared to nonviable livers. Enrichment of pro-survival signaling was also broader in these livers. Conclusions: NMP of discarded DCD human livers results in ischemia-reperfusion injury, but importantly activates autophagy as a means of cellular repair. More pronounced activation of autophagy was seen in livers that met viability criteria for transplantation. Therapeutic targeting of the autophagy mechanism may allow rehabilitation of nonviable livers for transplantation.
2022-01-25 | GSE165568 | GEO
Project description:Human kidneys which were accepted for transplantation and subsequently not used were subjected to ex vivo normothermic machine perfusion. During perfusion it was found the tubular epithelia synthesized fibrinogen which led to red blood cell aggregation and pathologic plugging of renal microvasculature. Sequential ex vivo delivery of plasminogen and tissue plasminogen activator (tPA) during normothermic machine perfusion effectively lyses these fibrinogen-mediated plugs.
2022-10-01 | GSE139017 | GEO
Project description:Background and Aims: Liver transplantation is a successful treatment for patients with liver failure. However, organ shortage results in over 11% of patients loosing their chance of a transplant due to worsening of their liver disease. Ischemia/reperfusion injury (IRI) is the major cause leading to graft loss after liver transplantation. Therefore, novel methods of organ-preservation have been developed in recent years to minimize IRI. One such device is the OrganOx metra, a normothermic machine perfusion (NMP) device providing oxygen and nutrition to allow aerobic metabolism and minimizing IRI. OrganOx metra has presented with several advantages compared to conventional cold storage (CS). We aimed to confirm the impact of NMP on reducing IRI and to define the underling mechanisms. Methods: We compared 12 NMP with 27 CS-preserved livers by performing gene microarray, immunoprofiling of hepatic lymphocytes and immunochemistry staining of liver tissues for assessing necrosis, platelet deposition and neutrophil infiltration, and the status of steatosis after NMP or CS pre- and post-reperfusion. Results: Recipients receiving NMP grafts showed significantly lower peak AST levels than those receiving CS grafts. NMP altered gene-expression profiles of liver tissue from pro-inflammation to pro-healing and regeneration. NMP also reduced the number of IFN- and IL-17 producing T cells and enlarged CD4posCD25highCD127negFOXP3pos Treg pool. NMP liver tissues showed less necrosis and apoptosis in the parenchyma and fewer neutrophils and platelet infiltration compared to CS liver tissues. Conclusion: Reduced IRI in NMP recipients was the consequence of the combination of inhibiting inflammation and promoting graft regeneration.
2019-04-10 | GSE112713 | GEO
Project description:Normothermic machine perfusion (NMP) inhibits proinflammatory responses in the liver and promotes regeneration
| PRJNA448772 | ENA
Project description:Pan-caspase inhibition during normothermic machine perfusion of discarded livers mitigates ischemia-reperfusion injury
| PRJNA836578 | ENA
Project description:To identify the main biological effects of the normothermic machine perfusion (NMP) in marginal kidneys, we measured, by mass spectrometry analysis, changes in the proteomic profile of kidney tissues and urines of eight organs reconditioned for 120 minutes (by a Kidney Assist device). Biopsy specimens were taken at the time of the pre-implantation histological evaluation (T-1), at the start of back table preparation (T0), and after 60 (T60) and 120(T120) minutes. Urine were collected at T0, T30, T60 and T120. Several bioinformatics/statistical algorithms (including SVM and PLS-DA) were used to select the most discriminative proteins. Bioinformatics analysis showed that, during NMP, a large number of proteins resulted down- or up-regulated in the kidneys (169 and 196, respectively). SVM and PLS-DA analysis restricted this panel to 50 top-discriminative proteins. Among these, 11 proteins resulted similarly up-regulated(LXN, ETFB, NUDT3, CYCS and UQCRC1)and down-regulated after NMP treatment (CFHR3, C1S, CFI, KNG1, SERPINC1, F9)in urine.Functional analysis, then, revealed that the most up-regulated proteins were involved in the oxidative phosphorylation system (OXPHOS) and ATPsynthesis, while thoseunder-expressed were implicated in the complement and coagulation cascade.Our proteomic analysis demonstrated that NMP (also for a brief period of time) may induce substantial metabolic and biochemical changes in marginal organs. This encourages use of this technology in clinic.
2023-05-10 | PXD036432 | Pride