Name: visualization and analysis of blood flow and oxygen consumption in hepatic microcirculation: application to an acute hepatitis model
Uploaded: 2012-08-04T17:00:00
Description: Watch this Scientific Journal Video about Visualization and Analysis of Blood Flow and Oxygen Consumption in Hepatic Microcirculation: Application to an Acute Hepatitis Model at JoVE.com

Authors thank Ms. Risa Otsuka for technical assistance and helping experiments. This research was partially supported by the Ministry of Education, Science, Sports and Culture, Grant-in-Aid for Young Scientists (B), 2010, 22700476, and Suzuken Memorial Foundation 2010 for K.T. And this study was supported by Research and Development of the Next-Generation Integrated Simulation of Living Matter, a part of the Development and Use of the Next-Generation Supercomputer Project of MEXT, and in part by JST ERATO Suematsu Gas Biology Project.

1. Labeling Erythrocytes with Fluorescein Isothiocyanate Isomer I (FITC)
All the experimental protocols we used were approved by the Animal Care Committee of Keio University School of Medicine.
<ol>
 <li> Anesthetize a donor mice, and after making a celiotomy incision withdraw whole blood from the inferior vena cava with a 1-ml syringe containing small amount of heparin. The mouse was immediately euthanized by sodium pentobarbital injection (100 mg/kg i.p.). </li>
 <li> Wash the whole b...

<ol>
	<li>Ishikawa, M., Sekizuka, E., Shimizu, K., Yamaguchi, N., Kawase, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Measurement+of+RBC+velocities+in+the+rat+pial+arteries+with+an+image-intensified+high-speed+video+camera+system.">Measurement of RBC velocities in the rat pial arteries with an image-intensified high-speed video camera system.</a> Microvasc. Res. 56, 166-172 (1998).</li><li>Tsukada, K., Sekizuka, E., Oshio, C., Tsujioka, K., Minamitani, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Red+blood+cell+velocity+and+oxygen+tension+measurement+in+cerebral+microvessels+by+double-wavelength+photoexcitation.">Red blood cell velocity and oxygen tension measurement in cerebral microvessels by double-wavelength photoexcitation.</a> J. Appl. Physiol. 96, 1561-1568 (2004).</li><li>Stern, O., Volmer, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=&#220;ber+die+Abklingzeit+der+Fluoreszenz.">&#220;ber die Abklingzeit der Fluoreszenz.</a> Physik. Zeitschr. 20, 183-188 (1919).</li><li>Rumsey, W. L., Vanderkooi, J. M., Wilson, D. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Imaging+of+phosphorescence:+a+novel+method+for+measuring+oxygen+distribution+in+perfused+tissue.">Imaging of phosphorescence: a novel method for measuring oxygen distribution in perfused tissue.</a> Science. 241, 1649-1651 (1988).</li><li>Soga, T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Differential+metabolomics+reveals+ophthalmic+acid+as+an+oxidative+stress+biomarker+indicating+hepatic+glutathione+consumption.">Differential metabolomics reveals ophthalmic acid as an oxidative stress biomarker indicating hepatic glutathione consumption.</a> J. Biol. Chem. 281, 16768-16776 (2006).</li><li>Goda, N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Distribution+of+heme+oxygenase+isoforms+in+rat+liver.+Topographic+basis+for+carbon+monoxide-mediated+microvascular+relaxation.">Distribution of heme oxygenase isoforms in rat liver. Topographic basis for carbon monoxide-mediated microvascular relaxation.</a> J. Clin. Invest. 101, 604-612 (1998).</li><li>Grote, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=.">.</a> Physiologie der Menschen. , 560 (1980).</li><li>Suganuma, K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Erythrocytes+with+T-state-stabilized+hemoglobin+as+a+therapeutic+tool+for+postischemic+liver+dysfunction.">Erythrocytes with T-state-stabilized hemoglobin as a therapeutic tool for postischemic liver dysfunction.</a> Antioxid Redox Signal. 8, 1847-1855 (2006).</li><li>Vanderkooi, J. M., Maniara, G., Green, T. J., Wilson, D. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=An+optical+method+for+measurement+of+dioxygen+concentration+based+upon+quenching+of+phosphorescence.">An optical method for measurement of dioxygen concentration based upon quenching of phosphorescence.</a> J. Biol. Chem. 262, 5476-5482 (1987).</li><li>Bernal, W., Auzinger, G., Dhawan, A., Wendon, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Acute+liver+failure.">Acute liver failure.</a> Lancet. 376, 190-201 (2010).</li><li>Hinson, J. A., Roberts, D. W., James, L. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mechanisms+of+acetaminophen-induced+liver+necrosis.">Mechanisms of acetaminophen-induced liver necrosis.</a> Handb. Exp. Pharmacol. 169, 369-405 (2010).</li><li>Hinson, J. A., Reid, A. B., McCullough, S. S., James, L. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Acetaminophen-induced+hepatotoxicity:+role+of+metabolic+activation,+reactive+oxygen/nitrogen+species,+and+mitochondrial+permeability+transition.">Acetaminophen-induced hepatotoxicity: role of metabolic activation, reactive oxygen/nitrogen species, and mitochondrial permeability transition.</a> Drug Metab. Rev. 36, 805-822 (2004).</li><li>Lieber, C. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Medical+disorders+of+alcoholism.">Medical disorders of alcoholism.</a> N. Engl. J. Med. 333, 1058-1065 (1995).</li><li>Zimmerman, H. J., Maddrey, W. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Acetaminophen+(paracetamol)+hepatotoxicity+with+regular+intake+of+alcohol:+analysis+of+instances+of+therapeutic+misadventure.">Acetaminophen (paracetamol) hepatotoxicity with regular intake of alcohol: analysis of instances of therapeutic misadventure.</a> Hepatology. 22, 767-773 (1995).</li></ol>

Delivering oxygen to tissues is an essential role of the microcirculation, and a lot of papers describe diseases related to microvessel anatomy and rheology6. Liver blood flow is a combination of arterial and venous blood. About 30% of the blood flow to the liver is well-oxygenated blood provided by the hepatic artery and the other 70%, provided by the portal vein, is the poorly oxygenated blood venous outflow from the spleen and gastrointestinal tract7. Liver diseases such as fatty liver, shock, or...

<table border="1">
<tbody>
 <tr>
 <td>Name 			of the reagent</td>
 <td>Company</td>
 <td>Catalogue number</td>
 </tr>
 <tr>
 <td>Pd(II) 			meso-Tetra(4-carboxyphenyl)porphine</td>
 <td>Frontier Scientific, Inc.</td>
 <td>PdT790</td>
 </tr>
 <tr>
 <td>Fluorescein isothiocyanate 			isomer I</td>
 <td>Sigma-Aldrich Co.</td>
 <td>F7250</td>
 </tr>
 <tr>
 <td>Acetaminophen</td>
 <td>Sigma-Aldrich Co.</td>
 <td>A7085</td>
 </tr>
 </tbody>
</table> 
<table border="1">
<tbody>
 <tr>
 <td>Name 			of the equipment</td>
 <td>Company</td>
 <td>Catalogue number</td>
 </tr>
 <tr>
 	<td>&nbsp;</td>
	<td>&nbsp;</td>
	<td>&nbsp;</td>
 <td>Equipment</td>
</tr> <tr>
 	<td>photomultiplier tube</td>
	<td>hamamatsu photonics k.k</td>
	<td>H10722-20 </td>
</tr>
</tbody>
</table>

visualization and analysis of blood flow and oxygen consumption in hepatic microcirculation: application to an acute hepatitis model

There is a considerable discrepancy between oxygen supply and demand in the liver because hepatic oxygen consumption is relatively high but about 70% of the hepatic blood supply is poorly oxygenated portal vein blood derived from the gastrointestinal tract and spleen. Oxygen is delivered to hepatocytes by blood flowing from a terminal branch of the portal vein to a central venule via sinusoids, and this makes an oxygen gradient in hepatic lobules. The oxygen gradient is an important physical parameter that involves the expression of enzymes upstream and downstream in hepatic microcirculation, but the lack of techniques for measuring oxygen consumption in the hepatic microcirculation has delayed the elucidation of mechanisms relating to oxygen metabolism in liver. We therefore used FITC-labeled erythrocytes to visualize the hepatic microcirculation and used laser-assisted phosphorimetry to measure the partial pressure of oxygen in the microvessels there. Noncontact and continuous optical measurement can quantify blood flow velocities, vessel diameters, and oxygen gradients related to oxygen consumption in the liver. In an acute hepatitis model we made by administering acetaminophen to mice we observed increased oxygen pressure in both portal and central venules but a decreased oxygen gradient in the sinusoids, indicating that hepatocyte necrosis in the pericentral zone could shift the oxygen pressure up and affect enzyme expression in the periportal zone. In conclusion, our optical methods for measuring hepatic hemodynamics and oxygen consumption can reveal mechanisms related to hepatic disease.

Watch this Scientific Journal Video about Visualization and Analysis of Blood Flow and Oxygen Consumption in Hepatic Microcirculation: Application to an Acute Hepatitis Model at JoVE.com

Visualization and Analysis of Blood Flow and Oxygen Consumption in Hepatic Microcirculation: Application to an Acute Hepatitis Model

An optical system was developed to visualize hepatic microcirculation with FITC-labeled erythrocytes and to measure the partial pressure of oxygen in the microvessels with laser-assisted phosphorimetry. This method can be used to investigate physiological and pathological mechanisms by analyzing microvascular structure, diameter, blood flow velocity, and oxygen tension.

There is a considerable discrepancy between oxygen supply and demand in the liver because hepatic oxygen consumption is relatively high but about 70% of ...

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