Name: a small animal model of ex vivo normothermic liver perfusion
Uploaded: 2018-06-27T14:00:00
Description: Watch this Scientific Journal Video about A Small Animal Model of Ex Vivo Normothermic Liver Perfusion at JoVE.com

This work was supported by NIH T32AI 106704-01A1 and the T. Flesch Fund for Organ Transplantation, Perfusion, Engineering and Regeneration at The Ohio State University.

All procedures were performed according to the guidelines of the Institutional Animal Care and National Research Council&#8217;s Guide for the Humane Care and Use of Laboratory Animals (IACUC) and has undergone approval by the Ohio State University IACUC committee.
1. Initial Set-up
<ol>
	<li>Prepare the perfusion solution by combining the following: 86 mL of 25% albumin, 184 mL of Williams&#8217; media, 30 mL of penicillin/streptomycin (10 U/mL penicillin and 0.01 mg/mL streptomycin...

<ol>
	<li>. National Data. Overall by Organ. Current U.S. Waiting List. Based on OPTN data as of October 19, 2017 Available from: <a target="_blank" href="https://optn.transplant.hrsa.gov/data/view-data-reports/national-data/">https://optn.transplant.hrsa.gov/data/view-data-reports/national-data/</a> (2017)</li><li>. National Data, Transplants by Donor Type, U.S. Transplants Performed January 1, 1988 - December 31, 2016, For Organ = Liver Available from: <a target="_blank" href="https://optn.transplant.hrsa.gov/data/view-data-reports/national-data/">https://optn.transplant.hrsa.gov/data/view-data-reports/national-data/</a> (2017)</li><li>Nemes, B., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Extended+criteria+donors+in+liver+transplantation+Part+I:+reviewing+the+impact+of+determining+factors.">Extended criteria donors in liver transplantation Part I: reviewing the impact of determining factors.</a> Expert Rev Gastroenterol Hepatol. 10 (7), 827-839 (2016).</li><li>Nemes, B., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Extended-criteria+donors+in+liver+transplantation+Part+II:+reviewing+the+impact+of+extended-criteria+donors+on+the+complications+and+outcomes+of+liver+transplantation.">Extended-criteria donors in liver transplantation Part II: reviewing the impact of extended-criteria donors on the complications and outcomes of liver transplantation.</a> Expert Rev Gastroenterol Hepatol. 10 (7), 841-859 (2016).</li><li>Pezzati, D., Ghinolfi, D., De Simone, P., Balzano, E., Filipponi, F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Strategies+to+optimize+the+use+of+marginal+donors+in+liver+transplantation.">Strategies to optimize the use of marginal donors in liver transplantation.</a> World J Hepatol. 7 (26), 2636-2647 (2015).</li><li>Marecki, H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Liver+ex+situ+machine+perfusion+preservation:+A+review+of+the+methodology+and+results+of+large+animal+studies+and+clinical+trials.">Liver ex situ machine perfusion preservation: A review of the methodology and results of large animal studies and clinical trials.</a> Liver Transpl. 23 (5), 679-695 (2017).</li><li>Barbas, A. S., Knechtle, S. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Expanding+the+Donor+Pool+With+Normothermic+Ex+Vivo+Liver+Perfusion:+The+Future+Is+Now.">Expanding the Donor Pool With Normothermic Ex Vivo Liver Perfusion: The Future Is Now.</a> Am J Transplant. 16 (11), 3075-3076 (2016).</li><li>Dries, S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ex+vivo+normothermic+machine+perfusion+and+viability+testing+of+discarded+human+donor+livers.">Ex vivo normothermic machine perfusion and viability testing of discarded human donor livers.</a> Am J Transplant. 13 (5), 1327-1335 (2013).</li><li>Westerkamp, A. C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=End-ischemic+machine+perfusion+reduces+bile+duct+injury+in+donation+after+circulatory+death+rat+donor+livers+independent+of+the+machine+perfusion+temperature.">End-ischemic machine perfusion reduces bile duct injury in donation after circulatory death rat donor livers independent of the machine perfusion temperature.</a> Liver Transpl. 21 (10), 1300-1311 (2015).</li><li>Selzner, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Normothermic+ex+vivo+liver+perfusion+using+steen+solution+as+perfusate+for+human+liver+transplantation:+First+North+American+results.">Normothermic ex vivo liver perfusion using steen solution as perfusate for human liver transplantation: First North American results.</a> Liver Transpl. 22 (11), 1501-1508 (2016).</li><li>Whitson, B. A., Black, S. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Organ+assessment+and+repair+centers:+The+future+of+transplantation+is+near.">Organ assessment and repair centers: The future of transplantation is near.</a> World J Transplant. 4 (2), 40-42 (2014).</li><li>Tolboom, H., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Subnormothermic+machine+perfusion+at+both+20&#176;C+and+30&#176;C+recovers+ischemic+rat+livers+for+successful+transplantation.">Subnormothermic machine perfusion at both 20&#176;C and 30&#176;C recovers ischemic rat livers for successful transplantation.</a> J Surg Res. 175 (1), 149-156 (2012).</li><li>Nagrath, D., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Metabolic+preconditioning+of+donor+organs:+defatting+fatty+livers+by+normothermic+perfusion+ex+vivo.">Metabolic preconditioning of donor organs: defatting fatty livers by normothermic perfusion ex vivo.</a> Metab Eng. 11 (4-5), 274-283 (2009).</li><li>Boehnert, M. U., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Normothermic+acellular+ex+vivo+liver+perfusion+reduces+liver+and+bile+duct+injury+of+pig+livers+retrieved+after+cardiac+death.">Normothermic acellular ex vivo liver perfusion reduces liver and bile duct injury of pig livers retrieved after cardiac death.</a> Am J Transplant. 13 (6), 1441-1449 (2013).</li><li>Sch&#246;n, M. R., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Liver+transplantation+after+organ+preservation+with+normothermic+extracorporeal+perfusion.">Liver transplantation after organ preservation with normothermic extracorporeal perfusion.</a> Ann Surg. 233 (1), 114-123 (2001).</li><li>Reddy, S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Non-heart-beating+donor+porcine+livers:+the+adverse+effect+of+cooling.">Non-heart-beating donor porcine livers: the adverse effect of cooling.</a> Liver Transpl. 11 (1), 35-38 (2005).</li><li>Banan, B., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Novel+strategy+to+decrease+reperfusion+injuries+and+improve+function+of+cold-preserved+livers+using+normothermic+ex+vivo+liver+perfusion+machine.">Novel strategy to decrease reperfusion injuries and improve function of cold-preserved livers using normothermic ex vivo liver perfusion machine.</a> Liver Transpl. 22 (3), 333-343 (2016).</li><li>Held, P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> An Introduction to Reactive Oxygen Species: Measurement of ROS in Cells. , 1-14 (2012).</li><li>Chen, C. 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S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Polyethylene+glycol-conjugated+superoxide+dismutase+in+focal+cerebral+ischemia-reperfusion.">Polyethylene glycol-conjugated superoxide dismutase in focal cerebral ischemia-reperfusion.</a> Am J Physiol. 265 (1 Pt 2), H252-H256 (1993).</li><li>I&#351;lekel, S., I&#351;lekel, H., G&#252;ner, G., Ozdamar, N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Alterations+in+superoxide+dismutase,+glutathione+peroxidase+and+catalase+activities+in+experimental+cerebral+ischemia-reperfusion.">Alterations in superoxide dismutase, glutathione peroxidase and catalase activities in experimental cerebral ischemia-reperfusion.</a> Res Exp Med (Berl). 199 (3), 167-176 (1999).</li><li>Li, G., Chen, Y., Saari, J. T., Kang, Y. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Catalase-overexpressing+transgenic+mouse+heart+is+resistant+to+ischemia-reperfusion+injury.">Catalase-overexpressing transgenic mouse heart is resistant to ischemia-reperfusion injury.</a> Am J Physiol. 273 (3 Pt 2), H1090-H1095 (1997).</li><li>Nowak, K., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Immunotargeting+of+catalase+to+lung+endothelium+via+anti-angiotensin-converting+enzyme+antibodies+attenuates+ischemia-reperfusion+injury+of+the+lung+in+vivo.">Immunotargeting of catalase to lung endothelium via anti-angiotensin-converting enzyme antibodies attenuates ischemia-reperfusion injury of the lung in vivo.</a> Am J Physiol Lung Cell Mol Physiol. 293 (1), L162-L169 (2007).</li><li>Beckman, J. S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Superoxide+dismutase+and+catalase+conjugated+to+polyethylene+glycol+increases+endothelial+enzyme+activity+and+oxidant+resistance.">Superoxide dismutase and catalase conjugated to polyethylene glycol increases endothelial enzyme activity and oxidant resistance.</a> J Biol Chem. 263 (14), 6884-6892 (1988).</li><li>Yabe, Y., Nishikawa, M., Tamada, A., Takakura, Y., Hashida, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Targeted+delivery+and+improved+therapeutic+potential+of+catalase+by+chemical+modification:+combination+with+superoxide+dismutase+derivatives.">Targeted delivery and improved therapeutic potential of catalase by chemical modification: combination with superoxide dismutase derivatives.</a> J Pharmacol Exp Ther. 289 (2), 1176-1184 (1999).</li><li>Yabe, Y., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Prevention+of+neutrophil-mediated+hepatic+ischemia/reperfusion+injury+by+superoxide+dismutase+and+catalase+derivatives.">Prevention of neutrophil-mediated hepatic ischemia/reperfusion injury by superoxide dismutase and catalase derivatives.</a> J Pharmacol Exp Ther. 298 (3), 894-899 (2001).</li><li>Ushitora, M., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Prevention+of+hepatic+ischemia-reperfusion+injury+by+pre-administration+of+catalase-expressing+adenovirus+vectors.">Prevention of hepatic ischemia-reperfusion injury by pre-administration of catalase-expressing adenovirus vectors.</a> J Control Release. 142 (3), 431-437 (2010).</li><li>Kakizaki, Y., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+Effects+of+Short-Term+Subnormothermic+Perfusion+after+Cold+Preservation+on+Liver+Grafts+from+Donors+after+Cardiac+Death:+An+Ex+Vivo+Rat+Model.">The Effects of Short-Term Subnormothermic Perfusion after Cold Preservation on Liver Grafts from Donors after Cardiac Death: An Ex Vivo Rat Model.</a> Transplantation. , (2018).</li><li>Kumar, R., Chung, W. Y., Dennison, A. R., Garcea, G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ex+Vivo+Porcine+Organ+Perfusion+Models+as+a+Suitable+Platform+for+Translational+Transplant+Research.">Ex Vivo Porcine Organ Perfusion Models as a Suitable Platform for Translational Transplant Research.</a> Artif Organs. , (2017).</li><li>Nativ, N. I., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Liver+defatting:+an+alternative+approach+to+enable+steatotic+liver+transplantation.">Liver defatting: an alternative approach to enable steatotic liver transplantation.</a> Am J Transplant. 12 (12), 3176-3183 (2012).</li><li>Yeung, J. C., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ex+vivo+adenoviral+vector+gene+delivery+results+in+decreased+vector-associated+inflammation+pre-+and+post-lung+transplantation+in+the+pig.">Ex vivo adenoviral vector gene delivery results in decreased vector-associated inflammation pre- and post-lung transplantation in the pig.</a> Mol Ther. 20 (6), 1204-1211 (2012).</li><li>Goldaracena, N., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Inducing+Hepatitis+C+Virus+Resistance+After+Pig+Liver+Transplantation-A+Proof+of+Concept+of+Liver+Graft+Modification+Using+Warm+Ex+Vivo+Perfusion.">Inducing Hepatitis C Virus Resistance After Pig Liver Transplantation-A Proof of Concept of Liver Graft Modification Using Warm Ex Vivo Perfusion.</a> Am J Transplant. 17 (4), 970-978 (2017).</li><li>Van Raemdonck, D., Neyrinck, A., Rega, F., Devos, T., Pirenne, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Machine+perfusion+in+organ+transplantation:+a+tool+for+ex+vivo+graft+conditioning+with+mesenchymal+stem+cells?.">Machine perfusion in organ transplantation: a tool for ex vivo graft conditioning with mesenchymal stem cells?.</a> Curr Opin Organ Transplant. 18 (1), 24-33 (2013).</li><li>Pratschke, S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Results+of+the+TOP+Study:+Prospectively+Randomized+Multicenter+Trial+of+an+Ex+Vivo+Tacrolimus+Rinse+Before+Transplantation+in+EDC+Livers.">Results of the TOP Study: Prospectively Randomized Multicenter Trial of an Ex Vivo Tacrolimus Rinse Before Transplantation in EDC Livers.</a> Transplant Direct. 2 (6), e76 (2016).</li><li>Pratschke, S., et al. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Protocol+TOP-Study+(tacrolimus+organ+perfusion):+a+prospective+randomized+multicenter+trial+to+reduce+ischemia+reperfusion+injury+in+transplantation+of+marginal+liver+grafts+with+an+ex+vivo+tacrolimus+perfusion.">Protocol TOP-Study (tacrolimus organ perfusion): a prospective randomized multicenter trial to reduce ischemia reperfusion injury in transplantation of marginal liver grafts with an ex vivo tacrolimus perfusion.</a> Transplant Res. 2 (1), 3 (2013).</li><li>Nativ, N. 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There is a significant shortage of liver allografts available for transplantation and in response donor criteria have been expanded1,2,3,4,5. As a result of the donor shortage, NEVLP has been introduced as a method to evaluate and modify organ function6,7. We have designed a rat model of NEVLP. Further...

There are 14,578 patients on the waiting list for liver transplantation and approximately 7,000 transplants are performed per year1,2. In response to this significant donor shortage, the criteria for liver donors have expanded; these are often referred to as marginal organs or extended criteria donors and are expected to perform less well after transplantation than standard criteria allografts, with higher rates of primary graft dysfunction and delayed graft function3,4,5,6. As a result, NEVLP has been introduced as a method to evaluate and modify organ function6,7. We have designed a rat model of NEVLP and used this model to demonstrate one of its important potential applications &#8211; the testing of novel molecule additives to liver perfusate.
NEVLP has been evaluated in both murine (rat) and porcine models, as well as in discarded human organs6,8,9. The results of the first human trials of NEVLP have also recently been published10. Although hypothermic machine perfusion has clearly become the standard for kidney preservation, the temperature at which liver machine perfusion should occur is still controversial. NEVLP has many proposed advantages in comparison to hypothermic and subnormothermic perfusion. These include reduced preservation injury, restoration of normal organ function under physiologic conditions, the ability to assess organ performance, and as a platform for organ repair, remodeling, and modification7,11,12,13,14,15,16,17.
A significant number of studies have been completed using porcine NEVLP models. Although these models are comparatively inexpensive when considering models using discarded human organs or human clinical trials, they are very expensive when compared to our small animal NEVLP model. A significant component of the per experiment cost is the perfusate. We are able to complete a 4 h perfusion with 300 mL of perfusate at a relatively low cost. Additionally, the cost of small animals including rats is very low in comparison to the cost of pigs.
In comparison to other models of NEVLP in the rat, the model presented here is relatively simple to implement and has a broad range of applications. The perfusion circuit can be seen in Figure 1. The perfusate starts in the perfusate reservoir (1), which is a water jacketed container. Perfusate is pulled from the reservoir by a roller pump (2) and pushed into a windkessel (3) and then the oxygenator (4). The oxygenator is set for countercurrent gas and perfusate flow to provide maximum gas exchange. The perfusate then proceeds to a heating coil (5) inside the perfusion chamber to ensure it is at physiologic temperature, and a bubble trap (6) to prevent perfusion of air bubbles There are pre-organ (7) and post-organ (8) sample ports, which allow the perfusate to be sampled. The perfusate then enters the liver through the portal vein cannula. The portal vein cannula is attached to a pressure monitor that charts the values on the data collection software. The perfusate then exits the liver through the IVC cannula and flows into the pressure equalizer block (9). Finally, the perfusate is pulled from the pressure block back through the roller pump and emptied into the reservoir. This model includes continuous perfusion to the portal vein and leaves out the pulsatile flow to the hepatic artery and dialysis used in some other models, each of which requires a separate and additional circuit, but have previously been demonstrated to not be required9,13.
To explore the addition of a novel therapeutic molecule to the perfusate, we chose the enzyme catalase. Catalase is an endogenous ROS scavenger that is part of the cells internal defense mechanism to mitigate the effects of ROS18. Catalase expression is increased in hepatic ischemia reperfusion injury19. Experimental addition of catalase has been demonstrated to decrease ischemia-reperfusion in the eye, brain, and lung20,21,22,23,24. Pegylation has been shown to target catalase to the endothelium and aid in catalase uptake into endothelial cells25. PEG-CAT has been administered systemically with limited efficacy in reducing hepatic ischemia-reperfusion injury; however, we hypothesized that adding PEG-CAT to an isolated organ perfusion circuit would lead to improved results26,27,28. Here, we add PEG-CAT to our base perfusate and demonstrate its ability mitigate liver preservation injury.

<table>
	<tbody>
		<tr>
			<td>Perfusate</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>8% Albumin</td>
			<td>CLS Behring, King of Prussia, PA</td>
			<td>0053-7680-32</td>
			<td></td>
		</tr>
		<tr>
			<td>Williams Media</td>
			<td>Sigma Aldrich, St. Louis, MO</td>
			<td>W1878</td>
			<td></td>
		</tr>
		<tr>
			<td>Penicillin/Streptomycin</td>
			<td>Sigma Aldrich, St. Louis, MO</td>
			<td>P4333</td>
			<td></td>
		</tr>
		<tr>
			<td>Insulin</td>
			<td>Eli Lilly, Indianapolis, IL</td>
			<td>0002-8215-91</td>
			<td></td>
		</tr>
		<tr>
			<td>Heparin</td>
			<td>Fresnius Lab, Lake Zurich, IL</td>
			<td>C504701</td>
			<td></td>
		</tr>
		<tr>
			<td>L-glutamine</td>
			<td>Sigma Aldrich, St. Louis, MO</td>
			<td>G3126</td>
			<td></td>
		</tr>
		<tr>
			<td>Hydrocortisone</td>
			<td>Sigma Aldrich, St. Louis, MO</td>
			<td>H0888</td>
			<td></td>
		</tr>
		<tr>
			<td>THAM</td>
			<td>Hospira, Inc,</td>
			<td>0409-1593-04</td>
			<td></td>
		</tr>
		<tr>
			<td>Polyethylene Glycol - Catalase</td>
			<td>Sigma Aldrich</td>
			<td>S9549 SIGMA</td>
			<td></td>
		</tr>
		<tr>
			<td>Personal Protective Equipment </td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Surgical Mask</td>
			<td>Generic</td>
			<td>N/A</td>
			<td></td>
		</tr>
		<tr>
			<td>Protective Gown</td>
			<td>Generic</td>
			<td>N/A</td>
			<td></td>
		</tr>
		<tr>
			<td>Surgical Gloves</td>
			<td>Generic</td>
			<td>N/A</td>
			<td></td>
		</tr>
		<tr>
			<td>Liver Procurement</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Sprague-Dawley Rat</td>
			<td>Harlan Sprague Dawley Inc.</td>
			<td>250 -350 grams</td>
			<td></td>
		</tr>
		<tr>
			<td>Surgical Microscope</td>
			<td>Leica</td>
			<td>M500-N w/ OHS</td>
			<td></td>
		</tr>
		<tr>
			<td>Charcoal Canisters</td>
			<td>Kent Scientific</td>
			<td>SOMNO-2001-8</td>
			<td></td>
		</tr>
		<tr>
			<td>Isoflurane</td>
			<td>Piramal Healthcare</td>
			<td>N/A</td>
			<td></td>
		</tr>
		<tr>
			<td>Pressure-Lok Precision Analytical Syringe&#160;</td>
			<td>Valco Instruments Co, Inc.</td>
			<td>SOMNO-10ML</td>
			<td></td>
		</tr>
		<tr>
			<td>Electrosurgical Unit</td>
			<td>Macan</td>
			<td>MV-7A</td>
			<td></td>
		</tr>
		<tr>
			<td>Warming Pad</td>
			<td>Braintree Scientific</td>
			<td>HHP2</td>
			<td></td>
		</tr>
		<tr>
			<td>SomnoSuite Small Animal Anesthesia System</td>
			<td>Kent Scientific</td>
			<td>SS-MVG-Module</td>
			<td></td>
		</tr>
		<tr>
			<td>PhysioSuite</td>
			<td>Kent Scientific</td>
			<td>PS-MSTAT-RT</td>
			<td></td>
		</tr>
		<tr>
			<td>Isoflurane chamber</td>
			<td>Kent Scientific</td>
			<td>SOMNO-0530LG</td>
			<td></td>
		</tr>
		<tr>
			<td>SurgiVet</td>
			<td>Isotec</td>
			<td>CDS 9000 Tabletop</td>
			<td></td>
		</tr>
		<tr>
			<td>Oxygen</td>
			<td>Praxair</td>
			<td>98015</td>
			<td></td>
		</tr>
		<tr>
			<td>Rib retractors</td>
			<td>Kent Scientific</td>
			<td>INS600240</td>
			<td></td>
		</tr>
		<tr>
			<td>GenieTouch</td>
			<td>Kent Scientific</td>
			<td>GenieTouch</td>
			<td></td>
		</tr>
		<tr>
			<td>Normal Saline</td>
			<td>Baxter</td>
			<td>NDC 0338-0048-04</td>
			<td></td>
		</tr>
		<tr>
			<td>4x4 Non-Woven Sponges</td>
			<td>Criterion</td>
			<td>104-2411</td>
			<td></td>
		</tr>
		<tr>
			<td>Sterile Q-Tips</td>
			<td>Henry Schein Animal Health</td>
			<td>1009175</td>
			<td></td>
		</tr>
		<tr>
			<td>U-100 27 Gauge Insulin Syringe</td>
			<td>Terumo</td>
			<td>22-272328</td>
			<td></td>
		</tr>
		<tr>
			<td>5mL Syringe</td>
			<td>BD</td>
			<td>REF 309603</td>
			<td></td>
		</tr>
		<tr>
			<td>4-0 Braided Silk Suture</td>
			<td>Deknatel, Inc.</td>
			<td>198737LP</td>
			<td></td>
		</tr>
		<tr>
			<td>7-0 Braided Silk Suture</td>
			<td>Teleflex Medical</td>
			<td>REF 103-S</td>
			<td></td>
		</tr>
		<tr>
			<td>16 gauge Catheters</td>
			<td>BBraun Introcan Safety</td>
			<td>4252586-02</td>
			<td></td>
		</tr>
		<tr>
			<td>14 gauge Catheters</td>
			<td>BBraun Introcan Safety</td>
			<td>4251717-02</td>
			<td></td>
		</tr>
		<tr>
			<td>Bile Duct Cannular Tubing</td>
			<td>Altec</td>
			<td>01-96-1727&#160;&#160;&#160;&#160;&#160; &#160;</td>
			<td></td>
		</tr>
		<tr>
			<td>Liver Perfusion Circuit Components </td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Water Bath Warmer</td>
			<td>Lauda Ecoline Staredition</td>
			<td>E103</td>
			<td></td>
		</tr>
		<tr>
			<td>Data Collection Software</td>
			<td>ADInstruments&#160;</td>
			<td>Labchart 7</td>
			<td></td>
		</tr>
		<tr>
			<td>Liver Perfusion Circuit</td>
			<td>Harvard Apparatus</td>
			<td>73-2901</td>
			<td></td>
		</tr>
		<tr>
			<td>Membrane Oxygenator</td>
			<td>Mediac SPA</td>
			<td>M03069</td>
			<td></td>
		</tr>
		<tr>
			<td>Roller Pump</td>
			<td>Ismatec</td>
			<td>ISM827B</td>
			<td></td>
		</tr>
		<tr>
			<td>Gas (95% oxygen and 5% carbon dioxide)</td>
			<td>Praxair</td>
			<td>98015</td>
			<td></td>
		</tr>
		<tr>
			<td>Organ Chamber</td>
			<td>Harvard Apparatus</td>
			<td>ILP-2</td>
			<td></td>
		</tr>
		<tr>
			<td>1.8 mL Arcticle Cryogenic Tube</td>
			<td>USA Scientific</td>
			<td>1418-7410</td>
			<td></td>
		</tr>
		<tr>
			<td>Mucasol</td>
			<td>Sigma-Aldrich</td>
			<td>Z637181</td>
			<td></td>
		</tr>
		<tr>
			<td>Microsurgical Instruments</td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Small Scissors</td>
			<td>Roboz</td>
			<td>RS-5610</td>
			<td></td>
		</tr>
		<tr>
			<td>Large Scissors</td>
			<td>S&#38;T</td>
			<td>SAA-15</td>
			<td></td>
		</tr>
		<tr>
			<td>Forceps - Large Angled</td>
			<td>S&#38;T</td>
			<td>JFCL-7</td>
			<td></td>
		</tr>
		<tr>
			<td>Forceps - Small Angled</td>
			<td>S&#38;T</td>
			<td>FRAS-15 RM-8</td>
			<td></td>
		</tr>
		<tr>
			<td>Clip Applier</td>
			<td>ROBOZ</td>
			<td>RS-5440</td>
			<td></td>
		</tr>
		<tr>
			<td>Scissors - non micro</td>
			<td>FST 14958-11</td>
			<td>14958-11</td>
			<td></td>
		</tr>
		<tr>
			<td>Forceps - Straight Tip</td>
			<td>S&#38;T</td>
			<td>FRS-15 RM8TC</td>
			<td></td>
		</tr>
		<tr>
			<td>Large Microsurgical Clip</td>
			<td>Fine Scientific Tools</td>
			<td>18055-01</td>
			<td></td>
		</tr>
		<tr>
			<td>Small Microsurgical Clip</td>
			<td>Fine Scientific Tools</td>
			<td>18055-01</td>
			<td></td>
		</tr>
		<tr>
			<td>Small Microsurgical Clip</td>
			<td>Fine Scientific Tools</td>
			<td>18055-02</td>
			<td></td>
		</tr>
		<tr>
			<td>Small Microsurgical Clip</td>
			<td>Fine Scientific Tools</td>
			<td>18055-03</td>
			<td></td>
		</tr>
		<tr>
			<td>Small Mosquito Clamps</td>
			<td>Generic</td>
			<td>N/A</td>
			<td></td>
		</tr>
		<tr>
			<td>Post-Experiment Analysis </td>
			<td></td>
			<td></td>
			<td></td>
		</tr>
		<tr>
			<td>Alanine Aminotransferase (ALT) Activity Colorimetric/Fluorometric Assay Kit</td>
			<td>BioVision</td>
			<td>K752</td>
			<td></td>
		</tr>
		<tr>
			<td>Adenosine Triphosphate (ATP) Colorimetric/Fluorometric Assay Kit</td>
			<td>BioVision</td>
			<td>K354</td>
			<td></td>
		</tr>
		<tr>
			<td>Glutathione Assay Kit</td>
			<td>Cayman Chemical</td>
			<td>703002</td>
			<td></td>
		</tr>
		<tr>
			<td>Lipid Peroxidation (MDA) Assay Kit</td>
			<td>Abcam</td>
			<td>ab118970</td>
			<td></td>
		</tr>
		<tr>
			<td>Caspase-Glo 3/7 Assay Systems</td>
			<td>Promega</td>
			<td>G8090</td>
			<td></td>
		</tr>
		<tr>
			<td>POLARstar OMEGA Microplate Reader</td>
			<td>BMG LABTECH</td>
			<td>N/A</td>
			<td></td>
		</tr>
	</tbody>
</table>

a small animal model of ex vivo normothermic liver perfusion

There is a significant shortage of liver allografts available for transplantation, and in response the donor criteria have been expanded. As a result, normothermic ex vivo liver perfusion (NEVLP) has been introduced as a method to evaluate and modify organ function. NEVLP has many advantages in comparison to hypothermic and subnormothermic perfusion including reduced preservation injury, restoration of normal organ function under physiologic conditions, assessment of organ performance, and as a platform for organ repair, remodeling, and modification. Both murine and porcine NEVLP models have been described. We demonstrate a rat model of NEVLP and use this model to show one of its important applications &#8212; the use of a therapeutic molecule added to liver perfusate. Catalase is an endogenous reactive oxygen species (ROS) scavenger and has been demonstrated to decrease ischemia-reperfusion in the eye, brain, and lung. Pegylation has been shown to target catalase to the endothelium. Here, we added pegylated-catalase (PEG-CAT) to the base perfusate and demonstrated its ability to mitigate liver preservation injury. An advantage of our rodent NEVLP model is that it is inexpensive in comparison to larger animal models. A limitation of this study is that it does not currently include post-perfusion liver transplantation. Therefore, prediction of the function of the organ post-transplantation cannot be made with certainty. However, the rat liver transplant model is well established and certainly could be used in conjunction with this model. In conclusion, we have demonstrated an inexpensive, simple, easily replicable NEVLP model using rats. Applications of this model can include testing novel perfusates and perfusate additives, testing software designed for organ evaluation, and experiments designed to repair organs.

A sample size of three rats per group was used. ALT was measured at 0, 30, 60, 90, 120, 150, 180, 210, and 240 min of perfusion. We used Student&#39;s t-tests to compare results between the base perfusate and base perfusate plus PEG-CAT groups at each time point. In comparing the base perfusate and base perfusate plus PEG-CAT groups, there is significantly less (p &#60;0.05) ALT in the base perfusate plus PEG-CAT group at 150, 180, 210, and 240 min (...

Watch this Scientific Journal Video about A Small Animal Model of Ex Vivo Normothermic Liver Perfusion at JoVE.com

A Small Animal Model of Ex Vivo Normothermic Liver Perfusion

There is a significant liver donor shortage, and criteria for liver donors have been expanded. Normothermic ex vivo liver perfusion (NEVLP) has been developed to evaluate and modify organ function. This study demonstrates a rat model of NEVLP and tests the ability of pegylated-catalase, to mitigate liver preservation injury.

A Small Animal Model of Ex Vivo Normothermic Liver Perfusion

There is a significant shortage of liver allografts available for transplantation, and in response the donor criteria have been expanded. As a result, ...

Research

JoVE Journal

Medicine

Technique of Subnormothermic Ex Vivo Liver Perfusion for the Storage, Assessment, and Repair of Marginal Liver Grafts

Technique of Subnormothermic Ex Vivo Liver Perfusion for the Storage, Assessment, and Repair of Marginal Liver Grafts

The success of liver transplantation has resulted in a dramatic organ shortage. In most transplant regions 20-30% of patients on the waiting list for ...

Procedure for Human Saphenous Veins Ex Vivo Perfusion and External Reinforcement

Procedure for Human Saphenous Veins Ex Vivo Perfusion and External Reinforcement

The mainstay of contemporary therapies for extensive occlusive arterial disease is venous bypass graft. However, its durability is threatened by intimal ...

Method of Isolated Ex Vivo Lung Perfusion in a Rat Model: Lessons Learned from Developing a Rat EVLP Program

Method of Isolated Ex Vivo Lung Perfusion in a Rat Model: Lessons Learned from Developing a Rat EVLP Program

The number of acceptable donor lungs available for lung transplantation is severely limited due to poor quality. Ex-Vivo Lung Perfusion (EVLP) has allowed ...

Ex Situ Normothermic Machine Perfusion of Donor Livers

Ex Situ Normothermic Machine Perfusion of Donor Livers

In contrast to conventional static cold preservation (0-4 &#176;C), ex situ machine perfusion may provide better preservation of donor livers. Continuous ...

Normothermic Ex Vivo Kidney Perfusion for the Preservation of Kidney Grafts prior to Transplantation

Normothermic Ex Vivo Kidney Perfusion for the Preservation of Kidney Grafts prior to Transplantation

Kidney transplantation has become a well-established treatment option for patients with end-stage renal failure. The persisting organ shortage remains a ...

Method of Direct Segmental Intra-hepatic Delivery Using a Rat Liver Hilar Clamp Model

Major hepatic surgery with inflow occlusion, and liver transplantation, necessitate a period of warm ischemia, and a period of reperfusion leading to ...

Assessment of Plasma Coagulation on Liver Tissue in a Large Animal Model In Vivo

Assessment of Plasma Coagulation on Liver Tissue in a Large Animal Model In Vivo

Plasma coagulation as a form of electrocautery is used in liver surgery for decades to seal the large liver cut surface after major hepatectomy to prevent ...

Isometric Contractility Measurement of the Mouse Mesenteric Artery Using Wire Myography

The wire myograph technique is used to assess the contractility of vascular smooth muscles in response to depolarization, GPCR agonists/inhibitors and ...

Normothermic Ex Situ Heart Perfusion in Working Mode: Assessment of Cardiac Function and Metabolism

The current standard method for organ preservation (cold storage, CS), exposes the heart to a period of cold ischemia that limits the safe preservation ...

Murine Precision-Cut Liver Slices as an Ex Vivo Model of Liver Biology

Understanding the mechanisms of liver injury, hepatic fibrosis, and cirrhosis that underlie chronic liver diseases (i.e., viral hepatitis, non-alcoholic ...