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Ex vivo perfusion

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https://www.readbyqxmd.com/read/28325895/simulation-assisted-design-of-microfluidic-sample-traps-for-optimal-trapping-and-culture-of-non-adherent-single-cells-tissues-and-spheroids
#1
Nassim Rousset, Frédéric Monet, Thomas Gervais
This work focuses on modelling design and operation of "microfluidic sample traps" (MSTs). MSTs regroup a widely used class of microdevices that incorporate wells, recesses or chambers adjacent to a channel to individually trap, culture and/or release submicroliter 3D tissue samples ranging from simple cell aggregates and spheroids, to ex vivo tissue samples and other submillimetre-scale tissue models. Numerous MST designs employing various trapping mechanisms have been proposed in the literature, spurring the development of 3D tissue models for drug discovery and personalized medicine...
March 21, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28323904/pyrrolidine-dithiocarbamate-administered-during-ex-vivo-lung-perfusion-promotes-rehabilitation-of-injured-donor-rat-lungs-obtained-after-prolonged-warm-ischemia
#2
Cyril Francioli, Xingyu Wang, Roumen Parapanov, Etienne Abdelnour, Jérôme Lugrin, Fabrizio Gronchi, Jean Perentes, Philippe Eckert, Hans-Beat Ris, Lise Piquilloud, Thorsten Krueger, Lucas Liaudet
Damaged lung grafts obtained after circulatory death (DCD lungs) and warm ischemia may be at high risk of reperfusion injury after transplantation. Such lungs could be pharmacologically reconditioned using ex-vivo lung perfusion (EVLP). Since acute inflammation related to the activation of nuclear factor kappaB (NF-κB) is instrumental in lung reperfusion injury, we hypothesized that DCD lungs might be treated during EVLP by pyrrolidine dithiocarbamate (PDTC), an inhibitor of NF-κB. Rat lungs exposed to 1h warm ischemia and 2 h cold ischemia were subjected to EVLP during 4h, in absence (CTRL group, N = 6) or in presence of PDTC (2...
2017: PloS One
https://www.readbyqxmd.com/read/28322021/cytoprotective-and-antioxidant-effects-of-steen-solution-on-human-lung-spheroids-and-human-endothelial-cells
#3
Francesca Pagano, Cristina Nocella, Sebastiano Sciarretta, Luca Fianchini, Camilla Siciliano, Giorgio Mangino, Mohsen Ibrahim, Elena De Falco, Roberto Carnevale, Isotta Chimenti, Giacomo Frati
Respiratory diseases represent a major healthcare burden worldwide. Lung transplantation (LTx) is the gold-standard for end-stage patients, strongly limited by shortage of available/suitable donor lungs. Normothermic ex vivo lung perfusion (EVLP) has significantly increased the number of lungs suitable for transplantation. Steen solution is used for EVLP, but the mechanisms involved in its beneficial properties remain to be clarified. We investigated the effects of Steen solution in an in vitro protocol of cold starvation and normothermic recovery (CS/NR) on human lung spheroids, named pneumospheres (PSs), containing epithelial/basal cells, and on endothelial HUVEC cells...
March 20, 2017: American Journal of Transplantation
https://www.readbyqxmd.com/read/28319030/ischemic-small-intestine-in-vivo-versus-ex-vivo-bioimpedance-measurements
#4
Runar James Strand-Amundsen, Henrik Reims, Christian Tronstad, Havard Kalvoy, Orjan Martinsen, Jan Hogetveit, Tom Erik Ruud, Tor Inge Tønnessen
Bioimpedance has been used to investigate changes in electrical parameters during ischemia in various tissues. The small intestine is a multi-layered structure, with several distinct tissue types, and ischemia related changes occur at different times in the different intestinal layers. When investigating how the electrical properties in the small intestine is affected by ischemia, some researchers have used ex-vivo models while others have used in-vivo models. In this study, we compare ischemic time development of electrical parameters in ischemic in-vivo versus ex-vivo small intestine...
March 20, 2017: Physiological Measurement
https://www.readbyqxmd.com/read/28314503/standard-donor-lung-procurement-with-normothermic-ex-vivo-lung-perfusion-a-prospective-randomized-clinical-trial
#5
Alexis Slama, Lukas Schillab, Maximilian Barta, Aris Benedek, Andreas Mitterbauer, Konrad Hoetzenecker, Shahrokh Taghavi, Gyoergy Lang, Jose Matilla, Hendrik Ankersmit, Helmut Hager, Georg Roth, Walter Klepetko, Clemens Aigner
BACKGROUND: Ex vivo lung perfusion (EVLP) was primarily developed for evaluation of impaired donor lungs. The good clinical results raise the question for its possible impact on lungs meeting standard criteria. Before application of EVLP on such lungs enters routine clinical practice, it must be demonstrated whether EVLP would affect or improve outcome when used in standard donor lungs. We performed a prospective randomized trial to investigate the role of EVLP in standard lung transplantation (Tx)...
February 20, 2017: Journal of Heart and Lung Transplantation
https://www.readbyqxmd.com/read/28306670/innovations-in-cardiac-transplantation
#6
Reema Hasan, Ashraf Abou El Ela, Daniel Goldstein
PURPOSE OF REVIEW: As the number of people living with heart failure continues to grow, future treatments will focus on efficient donor organ donation and ensuring safe and durable outcomes. This review will focus on organ procurement, graft surveillance and emerging therapies. RECENT FINDINGS: Preliminary studies into donation after cardiac death have indicated that this may be an effective means to increase the donor pool. Novel preservation techniques that include ex-vivo perfusion to improve donor metabolic stabilization prior to implantation may also expand the donor pool...
March 16, 2017: Current Opinion in Cardiology
https://www.readbyqxmd.com/read/28301389/ex-vivo-lung-perfusion-the-model-for-the-organ-reconditioning-hub
#7
Jonathan C Yeung, Marcelo Cypel, Shaf Keshavjee
PURPOSE OF REVIEW: Lung evaluation and reconditioning by ex-vivo lung perfusion (EVLP) is becoming increasingly established. We review strategies for broader implementation of this technology to transplant centers worldwide. RECENT FINDINGS: The organ reconditioning hub model is a viable strategy for disseminating EVLP to small and large transplant centers given the well tolerated prolongation of preservation time afforded by EVLP. Regulatory and process issues remain hurdles to be overcome...
March 15, 2017: Current Opinion in Organ Transplantation
https://www.readbyqxmd.com/read/28299899/salivary-gland-hypofunction-in-kk-ay-type-2-diabetic-mice
#8
Takashi Munemasa, Taro Mukaibo, Yusuke Kondo, Chihiro Masaki, Yuichiro Kusuda, Yuta Miyagi, Shintaro Tsuka, Ryuji Hosokawa, Tetsuji Nakamoto
BACKGROUND: Diabetes mellitus induces several hypofunctions in the body, including in the oral cavity. It is often associated with xerostomia, however the detailed underlying mechanism is not well characterized. METHODS: We used KK-Ay mice, a model of type 2 diabetes, to analyze the mechanism of diabetes-induced xerostomia with the ex vivo glandular perfusion technique, histological analysis, immunohistochemically and intracellular signaling analysis. RESULTS: Ex vivo submandibular gland secretions from KK-Ay mice decreased by 30% when stimulated with moderate stimulation of cholinergic agonist 0...
March 16, 2017: Journal of Diabetes
https://www.readbyqxmd.com/read/28299825/fingolimod-gilenya-%C3%A2-in-multiple-sclerosis-bradycardia-atrioventricular-blocks-and-mild-effect-on-the-qtc-interval-something-to-do-with-the-l-type-calcium-channel
#9
Sylvie Pilote, Chantale Simard, Benoit Drolet
Cardiac arrhythmias and ECG abnormalities including bradycardia, prolongation of the QT interval and atrioventricular (AV) conduction blocks have been extensively observed with fingolimod, the first marketed oral drug for treating the relapsing-remitting form of multiple sclerosis. The present study was aiming to further elucidate the effects of fingolimod on cardiac electrophysiology at three different levels; 1) in vitro, 2) ex vivo and 3) in vivo. 1) Patch-clamp experiments in whole cell configuration were performed on Cav 1...
March 16, 2017: Fundamental & Clinical Pharmacology
https://www.readbyqxmd.com/read/28296232/inhibitors-of-soluble-epoxide-hydrolase-minimize-ischemia-reperfusion-induced-cardiac-damage-in-normal-hypertensive-and-diabetic-rats
#10
Oliul Islam, Prashanth Patil, Sumanta K Goswami, Rema Razdan, Mohammed N Inamdar, Mohammed Rizwan, Jubin Mathew, Bora Inceoglu, Kin S Stephen Lee, Sung H Hwang, Bruce D Hammock
AIM: We designed a study to evaluate the cardioprotective effect of two soluble epoxide hydrolase (sEH) inhibitors, 1-(1-propanoylpiperidin-4-yl)-3-(4-trifluoromethoxy)phenyl)urea (TPPU) and trans-4-{4-[3-(4-trifluoromethoxyphenyl)-ureido]cyclohexyloxy}benzoic acid (t-TUCB), in ischemia-reperfusion (IR) model. METHODS: Cardioprotective effects of the sEH inhibitors were evaluated against IR-induced myocardial damage in hearts from normal, hypertensive and diabetic rats using Langendorff's apparatus...
March 15, 2017: Cardiovascular Therapeutics
https://www.readbyqxmd.com/read/28291795/experimental-chronic-kidney-disease-attenuates-ischemia-reperfusion-injury-in-an-ex-vivo-rat-lung-model
#11
Chung-Kan Peng, Kun-Lun Huang, Chou-Chin Lan, Yu-Juei Hsu, Geng-Chin Wu, Chia-Hui Peng, Chin-Pyng Wu, Khee-Siang Chan
Lung ischemia reperfusion injury (LIRI) is one of important complications following lung transplant and cardiopulmonary bypass. Although patients on hemodialysis are still excluded as lung transplant donors because of the possible effects of renal failure on the lungs, increased organ demand has led us to evaluate the influence of chronic kidney disease (CKD) on LIRI. A CKD model was induced by feeding Sprague-Dawley rats an adenine-rich (0.75%) diet for 2, 4 and 6 weeks, and an isolated rat lung in situ model was used to evaluate ischemia reperfusion (IR)-induced acute lung injury...
2017: PloS One
https://www.readbyqxmd.com/read/28276718/insulin-and-gsk3%C3%AE-inhibition-abrogates-the-infarct-sparing-effect-of-ischemic-postconditioning-in-ex-vivo-rat-hearts
#12
Erik Helgeland, Anita Wergeland, Rune M Sandøy, Maren Askeland, Anne Aspevik, Lars Breivik, Anne K Jonassen
OBJECTIVES: Pharmacological treatment of reperfusion injury using insulin and GSK3β inhibition has been shown to be cardioprotective, however, their interaction with the endogenous cardioprotective strategy, ischemic postconditioning, is not known. DESIGN: Langendorff perfused ex vivo rat hearts were subjected to 30 min of regional ischemia and 120 min of reperfusion. For the first 15 min of reperfusion hearts received either vehicle (Ctr), insulin (Ins) or a GSK3β inhibitor (SB415286; SB41), with or without interruption of ischemic postconditioning (IPost; 3 × 30 s of global ischemia)...
February 13, 2017: Scandinavian Cardiovascular Journal: SCJ
https://www.readbyqxmd.com/read/28270638/a-haemocompatible-and-scalable-nanoporous-adsorbent-monolith-synthesised-using-a-novel-lignin-binder-route-to-augment-the-adsorption-of-poorly-removed-uraemic-toxins-in-haemodialysis
#13
Susan R Sandeman, Yishan Zheng, Ganesh Ingavle, Carol Howell, Sergey Mikhalovsky, Kolitha Basnayake, Owen Boyd, Andrew Davenport, Nigel Beaton, Nathan Davies
Nanoporous adsorbents are promising materials to augment the efficacy of haemodialysis for the treatment of end stage renal disease where mortality rates remain unacceptably high despite improvements in membrane technology. Complications are linked in part to inefficient removal of protein bound and high molecular weight uremic toxins including key marker molecules albumin bound indoxyl sulphate (IS) and p-cresyl sulphate (PCS) and large inflammatory cytokines such as IL-6. The following study describes the assessment of a nanoporous activated carbon monolith produced using a novel binder synthesis route for scale up as an in line device to augment haemodialysis through adsorption of these toxins...
March 8, 2017: Biomedical Materials
https://www.readbyqxmd.com/read/28266040/ex-vivo-porcine-organ-perfusion-models-as-a-suitable-platform-for-translational-transplant-research
#14
Rohan Kumar, Wen Yuan Chung, Ashley Robert Dennison, Giuseppe Garcea
In transplantation surgery, extending the criteria for organ donation to include organs that may have otherwise been previously discarded has provided the impetus to improve organ preservation. The traditional method of cold static storage (CS) has been tried and tested and is suitable for organs meeting standard criteria donation. Ex vivo machine perfusion is, however, associated with evidence suggesting that it may be better than CS alone and may allow for organ donation criteria to be extended. Much of our knowledge of organ preservation is derived from animal studies...
March 6, 2017: Artificial Organs
https://www.readbyqxmd.com/read/28259374/supplemental-oxygen-during-hypothermic-kidney-preservation-a-systematic-review
#15
REVIEW
J M O'Callaghan, K T Pall, Lhm Pengel
We reviewed the evidence for ex-vivo Supplemental Oxygen during Hypothermic preservation (SOH) for deceased donor kidneys. Bibliographic databases were searched for human and animal studies of SOH in kidney transplantation reporting on patient or animal survival rate, discard rate, technical complications or renal function outcomes. We make special reference to a specific subgroup: supplemental oxygen applied during cold perfusion, referred to as Hypothermic Oxygenated Perfusion (HOP). Four human and 25 animal studies were identified...
February 17, 2017: Transplantation Reviews
https://www.readbyqxmd.com/read/28258595/transgenic-expression-of-human-leukocyte-antigen-e-attenuates-galko-hcd46-porcine-lung-xenograft-injury
#16
Christopher T Laird, Lars Burdorf, Beth M French, Natalia Kubicki, Xiangfei Cheng, Gheorghe Braileanu, Wenji Sun, Natalie A O'Neill, Arielle Cimeno, Dawn Parsell, Edward So, Andrea Bähr, Nikolai Klymiuk, Carol J Phelps, David Ayares, Agnes M Azimzadeh, Richard N Pierson
BACKGROUND: Lung xenografts remain susceptible to loss of vascular barrier function within hours in spite of significant incremental advances based on genetic engineering to remove the Gal 1,3-αGal antigen (GalTKO) and express human membrane cofactor protein (hCD46). Natural killer cells rapidly disappear from the blood during perfusion of GalTKO.hCD46 porcine lungs with human blood and presumably are sequestered within the lung vasculature. Here we asked whether porcine expression of the human NK cell inhibitory ligand HLA-E and β2 microglobulin inhibits GalTKO...
March 3, 2017: Xenotransplantation
https://www.readbyqxmd.com/read/28251913/elevated-hematocrit-enhances-platelet-accumulation-following-vascular-injury
#17
Bethany L Walton, Marcus Lehmann, Tyler Skorczewski, Lori A Holle, Joan D Beckman, Jeremy A Cribb, Micah J Mooberry, Adam R Wufsus, Brian C Cooley, Jonathan W Homeister, Rafal Pawlinski, Michael R Falvo, Nigel S Key, Aaron L Fogelson, Keith B Neeves, Alisa S Wolberg
Red blood cells (RBCs) demonstrate procoagulant properties in vitro, and elevated hematocrit is associated with reduced bleeding and increased thrombosis risk in humans. These observations suggest RBCs contribute to thrombus formation. However, effects of RBCs on thrombosis are difficult to assess because humans and mice with elevated hematocrit typically have co-existing pathologies. Using an experimental model of elevated hematocrit in healthy mice, we measured effects of hematocrit in two in vivo clot formation models...
March 1, 2017: Blood
https://www.readbyqxmd.com/read/28244953/effect-of-clopidogrel-on-thrombus-formation-in-an-ex-vivo-parallel-plate-flow-chamber-model-cannot-be-reversed-by-addition-of-platelet-concentrates-or-vwf-concentrate
#18
Kira Jahn, Klaudiusz Suchodolski, Andreas Schäfer, Bianca Sahlmann, Uwe Küster, Frank Echtermeyer, Simone Calmer, Gregor Theilmeier, Kai Johanning
BACKGROUND: Hemorrhage is the most important complication of antithrombotic therapy with P2Y12 receptor blockers. The administration of platelet concentrates (PCs) and von Willebrand factor (vWF) concentrates are common procedures to normalize impaired primary hemostasis in bleeding patients. We tested whether this strategy reverses the effect of clopidogrel using a parallel plate flow chamber model. METHODS: Whole blood from patients, who received a loading dose of clopidogrel with 600 mg and an ongoing dual antiplatelet therapy with 75 mg/d clopidogrel and 100 mg/d acetyl salicylic acid, compared with blood from healthy volunteers was examined in a collagen-coated parallel plate flow chamber...
April 2017: Anesthesia and Analgesia
https://www.readbyqxmd.com/read/28242077/ex%C3%A2-vivo-lung-perfusion-model-to-study-pulmonary-tissue-extracellular-microvesicle-profiles
#19
Prashanth Vallabhajosyula, Laxminarayana Korutla, Andreas Habertheuer, Sanjana Reddy, Christian Shaufler, Jared Lasky, Joshua Diamond, Edward Cantu
BACKGROUND: Extracellular microvesicles (EVs) are being increasingly studied for their diagnostic potential. We investigated the feasibility of studying the kinetics and tissue-specific profiles of pulmonary EVs in the context of ex vivo lung perfusion (EVLP) used for salvaging marginal lungs for transplantation. METHODS: Perfusate from six marginal donor lungs placed on EVLP was collected at the following time points: 0, 10, and 60 minutes after and after perfusate exchange with Steen Solution; 120 and 180 minutes...
February 24, 2017: Annals of Thoracic Surgery
https://www.readbyqxmd.com/read/28241986/short-fasting-does-not-protect-perfused-ex%C3%A2-vivo-rat-liver-against-ischemia-reperfusion-on-the-importance-of-a-minimal-cell-energy-charge
#20
Bérengère Papegay, Michaela Stadler, Vincent Nuyens, Véronique Kruys, Jean G Boogaerts, Joseph Vamecq
OBJECTIVE: Dietary restriction or reduced food intake was supported to protect against renal and hepatic ischemic injury. In this vein, short fasting was recently shown to protect in situ rat liver against ischemia-reperfusion. Here, perfused ex vivo instead of in situ livers were exposed to ischemia-reperfusion to study the impact of disconnecting liver from extrahepatic supply in energetic substrates on the protection given by short-term fasting. METHODS: Perfused ex vivo livers using short (18 h) fasted compared with fed rats were submitted to ischemia-reperfusion and studied for release of cytolysis markers in the perfusate...
March 2017: Nutrition
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