Name: isolation of atrial cardiomyocytes from a rat model of metabolic syndrome-related heart failure with preserved ejection fraction
Uploaded: 2018-07-26T14:00:00
Description: Watch this Scientific Journal Video about Isolation of Atrial Cardiomyocytes from a Rat Model of Metabolic Syndrome-related Heart Failure with Preserved Ejection Fraction at JoVE.com

This research was supported by the DZHK (German Centre for Cardiovascular Research, D.B.), the EKFS (Else-Kr&#246;ner-Fresenius Stiftung, F.H.), and by the BMBF (German Ministry of Education and Research), as well as the BIH-Charit&#233; clinical scientist program funded by the Charit&#233; - Universit&#228;tsmedizin Berlin and the Berlin Institute of Health (F.H.).

All experiments were approved by the local Ethics Committee (TVA T0060/15 and T0003-15) and performed in agreement with the Guidelines for the Care and Use of Laboratory Animals (National Institute of Health, U.S.A.).
NOTE: A simplified flowchart of the procedure is shown in Figure 1.
1. Prearrangements
<ol>
	<li>Prepare the buffers according to Table 1.</li>
</ol>
<table border="1" fo:keep-together.within-page="1" fo...

<ol>
	<li>Alberti, K. G., 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=Harmonizing+the+metabolic+syndrome:+a+joint+interim+statement+of+the+International+Diabetes+Federation+Task+Force+on+Epidemiology+and+Prevention;+National+Heart,+Lung,+and+Blood+Institute;+American+Heart+Association;+World+Heart+Federation;+International+Atherosclerosis+Society;+and+International+Association+for+the+Study+of+Obesity.">Harmonizing the metabolic syndrome: a joint interim statement of the International Diabetes Federation Task Force on Epidemiology and Prevention; National Heart, Lung, and Blood Institute; American Heart Association; World Heart Federation; International Atherosclerosis Society; and International Association for the Study of Obesity.</a> Circulation. 120 (16), 1640-1645 (2009).</li><li>. IDF Consensus Worldwide Definition of the Metabolic Syndrome Available from: <a target="_blank" href="https://www.idf.org/e-library/consensus-statements/60-idfconsensus-worldwide-definitionof-the-metabolic-syndrome.html">https://www.idf.org/e-library/consensus-statements/60-idfconsensus-worldwide-definitionof-the-metabolic-syndrome.html</a> (2006)</li><li>Melenovsky, V., 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=Left+atrial+remodeling+and+function+in+advanced+heart+failure+with+preserved+or+reduced+ejection+fraction.">Left atrial remodeling and function in advanced heart failure with preserved or reduced ejection fraction.</a> Circulation: Heart Failure. 8 (2), 295-303 (2015).</li><li>Goette, A., 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=EHRA/HRS/APHRS/SOLAECE+expert+consensus+on+atrial+cardiomyopathies:+definition,+characterization,+and+clinical+implication.">EHRA/HRS/APHRS/SOLAECE expert consensus on atrial cardiomyopathies: definition, characterization, and clinical implication.</a> EP Europace. 18 (10), 1455-1490 (2016).</li><li>Schotten, U., Verheule, S., Kirchhof, P., Goette, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Pathophysiological+mechanisms+of+atrial+fibrillation:+a+translational+appraisal.">Pathophysiological mechanisms of atrial fibrillation: a translational appraisal.</a> Physiological Reviews. 91 (1), 265-325 (2011).</li><li>Hohendanner, F., DeSantiago, J., Heinzel, F. 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A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Dyssynchronous+calcium+removal+in+heart+failure-induced+atrial+remodeling.">Dyssynchronous calcium removal in heart failure-induced atrial remodeling.</a> American Journal of Physiology-Heart and Circulatory Physiology. 311 (6), H1352-H1359 (2016).</li><li>Hohendanner, F., 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=Inositol-1,4,5-trisphosphate+induced+Ca2++release+and+excitation-contraction+coupling+in+atrial+myocytes+from+normal+and+failing+hearts.">Inositol-1,4,5-trisphosphate induced Ca2+ release and excitation-contraction coupling in atrial myocytes from normal and failing hearts.</a> The Journal of Physiology. 593 (6), 1459-1477 (2015).</li><li>Tada, 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=Role+of+mineralocorticoid+receptor+on+experimental+cerebral+aneurysms+in+rats.">Role of mineralocorticoid receptor on experimental cerebral aneurysms in rats.</a> Hypertension. 54 (3), 552-557 (2009).</li><li>Iwasaki, Y. 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R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Isolation+and+physiological+analysis+of+mouse+cardiomyocytes.">Isolation and physiological analysis of mouse cardiomyocytes.</a> Journal of Visualized Experiments. (91), e51109 (2014).</li><li>Thum, T., Borlak, J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Isolation+and+cultivation+of+Ca2++tolerant+cardiomyocytes+from+the+adult+rat:+improvements+and+applications.">Isolation and cultivation of Ca2+ tolerant cardiomyocytes from the adult rat: improvements and applications.</a> Xenobiotica. 30 (11), 1063-1077 (2000).</li><li>Egorova, M. V., Afanas'ev, S. A., Popov, S. V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+simple+method+for+isolation+of+cardiomyocytes+from+adult+rat+heart.">A simple method for isolation of cardiomyocytes from adult rat heart.</a> Bulletin of Experimental Biology and Medicine. 140 (3), 370-373 (2005).</li><li>Kohncke, 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=Isolation+and+Kv+channel+recordings+in+murine+atrial+and+ventricular+cardiomyocytes.">Isolation and Kv channel recordings in murine atrial and ventricular cardiomyocytes.</a> Journal of Visualized Experiments. (73), e50145 (2013).</li><li>Wagner, E., Brandenburg, S., Kohl, T., Lehnart, S. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Analysis+of+tubular+membrane+networks+in+cardiac+myocytes+from+atria+and+ventricles.">Analysis of tubular membrane networks in cardiac myocytes from atria and ventricles.</a> Journal of Visualized Experiments. (92), e51823 (2014).</li><li>Hohendanner, F., 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=Cellular+mechanisms+of+metabolic+syndrome-related+atrial+decompensation+in+a+rat+model+of+HFpEF.">Cellular mechanisms of metabolic syndrome-related atrial decompensation in a rat model of HFpEF.</a> Journal of Molecular and Cellular Cardiology. 115, 10-19 (2017).</li><li>Seluanov, A., Vaidya, A., Gorbunova, V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Establishing+primary+adult+fibroblast+cultures+from+rodents.">Establishing primary adult fibroblast cultures from rodents.</a> Journal of Visualized Experiments. (44), e2033 (2010).</li><li>Bootman, M. D., Higazi, D. R., Coombes, S., Roderick, H. 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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=Diastolic+dysfunction+and+left+atrial+volume:+a+population-based+study.">Diastolic dysfunction and left atrial volume: a population-based study.</a> Journal of the American College of Cardiology. 45 (1), 87-92 (2005).</li><li>Linz, 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=Cathepsin+A+mediates+susceptibility+to+atrial+tachyarrhythmia+and+impairment+of+atrial+emptying+function+in+Zucker+diabetic+fatty+rats.">Cathepsin A mediates susceptibility to atrial tachyarrhythmia and impairment of atrial emptying function in Zucker diabetic fatty rats.</a> Cardiovascular Research. 110 (3), 371-380 (2016).</li><li>Ackers-Johnson, 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=A+Simplified,+Langendorff-Free+Method+for+Concomitant+Isolation+of+Viable+Cardiac+Myocytes+and+Nonmyocytes+From+the+Adult+Mouse+Heart.">A Simplified, Langendorff-Free Method for Concomitant Isolation of Viable Cardiac Myocytes and Nonmyocytes From the Adult Mouse Heart.</a> Circulation Research. 119 (8), 909-920 (2016).</li><li>Ramanathan, T., Skinner, H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Coronary+blood+flow.">Coronary blood flow.</a> Continuing Education in Anaesthesia Critical Care &amp; Pain. 5 (2), 61-64 (2005).</li><li>Bond, M. 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G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=[On+the+Quantitative+Determination+of+Collagenase].">[On the Quantitative Determination of Collagenase].</a> Hoppe-Seyler's Zeitschrift f&#252;r physiologische Chemie. 333, 149-151 (1963).</li><li>Conceicao, G., Heinonen, I., Lourenco, A. P., Duncker, D. 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Here, we first described a protocol for the isolation of single-cell ACMs from a rat model of MetS-related HFpEF that shows marked atrial remodeling22. The procedure is uniquely challenging as excessive fatty tissue can make the surgical preparation, as well as the cannulation of the aorta, increasingly difficult. The troubleshooting guide provided in Table 2 addresses the most common issues of the isolation procedure.
<table border="1" fo:keep-together.within-page="1" fo:keep...

MetS describes a cluster of risk factors for diabetes mellitus type-2 and cardiovascular disease and includes an increased arterial blood pressure, dyslipidemia (raised triglycerides and lowered high-density lipoprotein cholesterol), increased fasting glucose, and central obesity1. The worldwide prevalence of MetS is estimated to be 25&#8211;30% and constantly rising2. HFpEF is a heterogenous clinical syndrome often associated with MetS. The cardiac remodeling during HFpEF and its preceding phases (i.e., hypertensive heart disease) is also accompanied by a remodeling of the atria3. Reduced contractile function and structural changes of the left atrium have been associated with increased mortality, atrial fibrillation, and new-onset heart failure4. Atrial remodeling is characterized by changes in the ion channel function, Ca2+ homeostasis, atrial structure, fibroblast activation, and tissue fibrosis5. Left atrial remodeling in MetS-related HFpEF and its underlying pathological mechanisms are still poorly understood and require a further in-depth investigation. Animal models have proven to be a valuable tool and lead to many advances in the field of atrial cardiomyopathies6,7,8,9.
Studies with isolated single-cell cardiomyocytes are frequently used to corroborate and complement in vivo findings. An isolation, and the potential subsequent cell culture, allow for the investigation of signaling pathways, ionic channel currents, and excitation-contraction-coupling. Under physiologic conditions, cardiomyocytes do not proliferate. The fusion between the transcriptional regulatory sequences of an atrial natriuretic factor and a simian virus 40 large T antigen in transgenic mice led to the creation of the first immortalized ACMs, named AT-110. The further development of AT-1 cells gave rise to HL-1 cells, which cannot only be serially passaged but also contract spontaneously11. They do, however, show structural and functional differences compared to freshly isolated cells, such as a less organized ultrastructure, a high occurrence of developing myofibrils11, and a hyperpolarization-activated inward current12. The isolation of ventricular cardiomyocytes (VCM) in rats and mice from a variety of models is well established13,14,15,16,17,18,19. Generally, the excised heart is mounted to a Langendorff apparatus and retrogradely perfused with a Ca2+-free buffer containing digestive enzymes, such as collagenases and proteases. Calcium is then reintroduced in a stepwise manner to the physiological conditions. However, even though protocols dedicated to the isolation of ACMs are available20,21, due to increased fibrosis and pressure-related differences, their usefulness in disease models with atrial remodeling is limited.
In this article, we have implemented a protocol for the isolation of atrial single-cell cardiomyocytes from animals that show atrial remodeling (i.e., in particular for the ZFS1 rat model for MetS-related HFpEF)22. Existing isolation protocols were optimized and complemented by a simple, custom-made device to control and modify the intraluminal pressure of the cardiac cavities, leading to higher yields of morphologically and functionally intact cardiomyocytes. The following protocol provides the researcher with a step-by-step guide, a detailed description of the custom-made equipment, a list of solutions, as well as a comprehensive troubleshooting guide.

<table border="0" cellpadding="0" cellspacing="0" width="935">
	<tbody>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">ZSF-1 Obese rat</td>
			<td style="width:292px;">Charles River Laboratories, Inc.</td>
			<td style="width:136px;"></td>
			<td style="width:227px;">21 weeks old</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Fine Iris Scissors</td>
			<td style="width:292px;">Fine Science Tools GmbH</td>
			<td style="width:136px;">14094-11</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Surgical Scissors</td>
			<td style="width:292px;">Fine Science Tools GmbH</td>
			<td style="width:136px;">14001-18</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Micro Dressing Forceps (curved, serrated)</td>
			<td style="width:292px;">Aesculap, Inc.</td>
			<td style="width:136px;">BD312R</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Tissue Forceps (straight, 1 x 2 teeth)</td>
			<td style="width:292px;">Aesculap, Inc.</td>
			<td style="width:136px;">BD537R</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Tying Forceps (angled)</td>
			<td style="width:292px;">Aesculap, Inc.</td>
			<td style="width:136px;">MA624R</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Rodent and Small Animal Guillotine</td>
			<td style="width:292px;">Kent Scientific Corp.</td>
			<td style="width:136px;">DCAP</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Low Cost Induction Chamber 3.0 L</td>
			<td style="width:292px;">Kent Scientific Corp.</td>
			<td style="width:136px;">SOMNO-0730&#160;</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Butterfly Winged Infusion Set 21 G</td>
			<td style="width:292px;">Hospira, Inc.</td>
			<td style="width:136px;">181106101</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Abbocath 16 G</td>
			<td style="width:292px;">Hospira, Inc.</td>
			<td>0G7149702</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Microlance Hypodermic Needle</td>
			<td style="width:292px;">Becton Dickinson GmbH</td>
			<td style="width:136px;">301300</td>
			<td>modify needle to make cannula</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Braun Original Perfusor Syringe 50 ml</td>
			<td style="width:292px;">B. Braun Melsungen AG</td>
			<td style="width:136px;">8728810F</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Braun Inject Solo Syringe 10 ml</td>
			<td style="width:292px;">B. Braun Melsungen AG</td>
			<td style="width:136px;">2057926</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Beaker 50ml</td>
			<td style="width:292px;">Duran Group (DWK Life Sciences GmbH)</td>
			<td>21 106 17</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Duroplan petri dish (100 x 20 mm)</td>
			<td style="width:292px;">Duran Group (DWK Life Sciences GmbH)</td>
			<td style="width:136px;">21 755 48</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Seraflex Suture USP 3/0</td>
			<td style="width:292px;">SERAG-WIESSNER GmbH &#38; Co. KG</td>
			<td style="width:136px;">IC208000</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">VWR disposable Square Weighin Boats 100ml</td>
			<td style="width:292px;">VWR, Inc.</td>
			<td style="width:136px;">10803-148</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Styrofoam surface</td>
			<td style="width:292px;"></td>
			<td style="width:136px;"></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Sodium chloride</td>
			<td style="width:292px;">Sigma-Aldrich, Inc.</td>
			<td style="width:136px;">71380</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Potassium chloride</td>
			<td style="width:292px;">Sigma-Aldrich, Inc.</td>
			<td style="width:136px;">P4504</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Potassium phosphate monobasic</td>
			<td style="width:292px;">Sigma-Aldrich, Inc.</td>
			<td style="width:136px;">P5379</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Sodium phosphate dibasic</td>
			<td style="width:292px;">Sigma-Aldrich, Inc.</td>
			<td style="width:136px;">S0876</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Magensium sulfate heptahydrate</td>
			<td style="width:292px;">Sigma-Aldrich, Inc.</td>
			<td style="width:136px;">230391</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Magensium chloride</td>
			<td style="width:292px;">Sigma-Aldrich, Inc.</td>
			<td style="width:136px;">M8266</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">HEPES</td>
			<td style="width:292px;">Sigma-Aldrich, Inc.</td>
			<td style="width:136px;">H3375</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Taurine</td>
			<td style="width:292px;">Sigma-Aldrich, Inc.</td>
			<td style="width:136px;">T0625</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Glucose</td>
			<td style="width:292px;">Sigma-Aldrich, Inc.</td>
			<td style="width:136px;">G7528</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">2,3-Butanedione monoxime</td>
			<td style="width:292px;">Sigma-Aldrich, Inc.</td>
			<td style="width:136px;">B0753</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Calcium chloride solution (1 M)</td>
			<td style="width:292px;">Sigma-Aldrich, Inc.</td>
			<td style="width:136px;">21115</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Bovine Serum Albumin</td>
			<td style="width:292px;">Sigma-Aldrich, Inc.</td>
			<td style="width:136px;">A9647</td>
			<td style="width:227px;"></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Liberase</td>
			<td style="width:292px;">Roche (Sigma-Aldrich, Inc.)</td>
			<td style="width:136px;">LIBTM-RO</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Heparin</td>
			<td style="width:292px;">Rotexmedica GmbH</td>
			<td style="width:136px;">3862357</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Forene (Isoflurane)</td>
			<td style="width:292px;">Abbvie Deutschland GmbH &#38; Co. KG</td>
			<td style="width:136px;">10182054</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Laminin from Engelbreth-Holm-Swarm murine sarcoma basement membrane</td>
			<td style="width:292px;">Sigma-Aldrich, Inc.</td>
			<td style="width:136px;">L2020</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">WillCo glass-bottom dish 500&#181;l 0.005mm</td>
			<td style="width:292px;">WillCo Wells B.V.</td>
			<td style="width:136px;">HBST-3522</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Fluo4 AM</td>
			<td style="width:292px;">Invitrogen (Thermo Fisher Scientific, Inc.)</td>
			<td>F14201</td>
			<td>5&#181;M for 20min at RT</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Di-8-ANNEPS</td>
			<td style="width:292px;">Invitrogen (Thermo Fisher Scientific, Inc.)</td>
			<td>D3167</td>
			<td>10&#181;M for 45 min at 37&#176; C&#160;</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Mitotracker RED FM</td>
			<td style="width:292px;">Invitrogen (Thermo Fisher Scientific, Inc.)</td>
			<td style="width:136px;">M22425</td>
			<td>20nM for 30 min at 37&#176; C</td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Jacketed reaction vessel 500 ml</td>
			<td style="width:292px;">Gebr. Rettberg GmbH</td>
			<td>107024414</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Jacketed reaction vessel 1000 ml</td>
			<td style="width:292px;">Gebr. Rettberg GmbH</td>
			<td>107025414</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Jacketed bubble trap</td>
			<td style="width:292px;">Gebr. Rettberg GmbH</td>
			<td>134720001</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">ED heating immersion circulator</td>
			<td style="width:292px;">Julabo GmbH</td>
			<td>9116000</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Reglo Digital MS-2/6 peristaltic pump</td>
			<td style="width:292px;">Ismatec (Cole-Parmer Gmbh)</td>
			<td style="width:136px;">ISM 831</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Voltcraft Thermometer 302 K/J</td>
			<td style="width:292px;">Conrad Electronic SE</td>
			<td style="width:136px;">030300546</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Tubing</td>
			<td style="width:292px;"></td>
			<td style="width:136px;"></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">LSM 700 microscope</td>
			<td style="width:292px;">Carl Zeiss, Inc.</td>
			<td style="width:136px;"></td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">ZEN 2.3 imaging software</td>
			<td style="width:292px;">Carl Zeiss, Inc.</td>
			<td style="width:136px;">410135-1011-240&#160;</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">Single channel heater controller TC-324B</td>
			<td style="width:292px;">Warner Instruments, LLC</td>
			<td style="width:136px;">64-2400</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">8 channel perfusion system</td>
			<td style="width:292px;">Warner Instruments, LLC</td>
			<td style="width:136px;">64-0185</td>
			<td></td>
		</tr>
		<tr height="20">
			<td height="20" style="height:20px;width:281px;">8 channel Multi-Line In-Line Solution Heaters</td>
			<td style="width:292px;">Warner Instruments, LLC</td>
			<td style="width:136px;">64-0105</td>
			<td></td>
		</tr>
	</tbody>
</table>

isolation of atrial cardiomyocytes from a rat model of metabolic syndrome-related heart failure with preserved ejection fraction

In this article, we describe an optimized, Langendorff-based procedure for the isolation of single-cell atrial cardiomyocytes (ACMs) from a rat model of metabolic syndrome (MetS)-related heart failure with preserved ejection fraction (HFpEF). The prevalence of MetS-related HFpEF is rising, and atrial cardiomyopathies associated with atrial remodeling and atrial fibrillation are clinically highly relevant as atrial remodeling is an independent predictor of mortality. Studies with isolated single-cell cardiomyocytes are frequently used to corroborate and complement in vivo findings. Circulatory vessel rarefication and interstitial tissue fibrosis pose a potentially limiting factor for the successful single-cell isolation of ACMs from animal models of this disease.
We have addressed this issue by employing a device capable of manually regulating the intraluminal pressure of cardiac cavities during the isolation procedure, substantially increasing the yield of morphologically and functionally intact ACMs. The acquired cells can be used in a variety of different experiments, such as cell culture and functional Calcium imaging (i.e., excitation-contraction-coupling).
We provide the researcher with a step-by-step protocol, a list of optimized solutions, thorough instructions to prepare the necessary equipment, and a comprehensive troubleshooting guide. While the initial implementation of the procedure might be rather difficult, a successful adaptation will allow the reader to perform state-of-the-art ACM isolations in a rat model of MetS-related HFpEF for a broad spectrum of experiments.

At 21 weeks of age, 60&#8211;90% of viable ACMs (estimated as described in step 6.1), after the calcium re-adaptation (step 5.4&#8211;5.7), can be isolated from ZSF-1 obese rats by this method (Figure 4A). In rats, ACMs are characterized by a different and more heterogenous phenotype compared to VCMs24,25. Figure 4B shows an individual ACM with preserved membranes and sar...

Watch this Scientific Journal Video about Isolation of Atrial Cardiomyocytes from a Rat Model of Metabolic Syndrome-related Heart Failure with Preserved Ejection Fraction at JoVE.com 

Isolation of Atrial Cardiomyocytes from a Rat Model of Metabolic Syndrome-related Heart Failure with Preserved Ejection Fraction (Video) | JoVE 

Here, we describe an optimized, Langendorff-based procedure for the isolation of single-cell atrial cardiomyocytes from a rat model of metabolic syndrome-related heart failure with preserved ejection fraction. A manual regulation of intraluminal pressure of cardiac cavities is implemented to yield functionally intact myocytes suitable for excitation-contraction-coupling studies.

Isolation of Atrial Cardiomyocytes from a Rat Model of Metabolic Syndrome-related Heart Failure with Preserved Ejection Fraction

In this article, we describe an optimized, Langendorff-based procedure for the isolation of single-cell atrial cardiomyocytes (ACMs) from a rat model of ...

Research

JoVE Journal

Medicine

Gene Transfer for Ischemic Heart Failure in a Preclinical Model

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Isolation and Cultivation of Adult Rat Cardiomyocytes

Isolation and Cultivation of Adult Rat Cardiomyocytes (Video) | JoVE 

In an intact heart, adjacent cells influence adult cardiomyocytes. With the method of isolation and cultivation of adult cardiomyocytes, a precise ...

Tachycardia-Induced Cardiomyopathy As a Chronic Heart Failure Model in Swine

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A stable and reliable model of chronic heart failure is required for many experiments to understand hemodynamics or to test effects of new treatment ...

Isolation of Atrial Myocytes from Adult Mice

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Generation of a Rat Model of Acute Liver Failure by Combining 70% Partial Hepatectomy and Acetaminophen

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Acute liver failure (ALF) is a clinical condition caused by various etiologies resulting in the loss of metabolic, biochemical, synthesizing, and ...

Establishing a Swine Model of Post-myocardial Infarction Heart Failure for Stem Cell Treatment

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