Les auteurs remercient Christiane Pahrmann pour son aide technique et l&#39;histologie du spectacle.

<html> Souris Balb / C d&#39;un poids minimum de 20g à l&#39;âge de 8 à 12 semaines sont achetés auprès de Charles River (Sandhofer Weg 7, D-97633 Sulzfeld). Les souris sont logées dans des conditions classiques, nourris avec des granulés de souris standard et eau ad libitum. Anesthetize souris avec l&#39;isoflurane (2%) en utilisant une chambre d&#39;induction. <ol><li> Rasez la zone du cou et le côté gauche de la cage thoracique et de désinfecter à l&#39;aide d&#39;éthanol à 80%. </li><li> Placez la souris sur son dos et placer un masque sur sa bouche et le nez pour maintenir l&#39;anesthésie. </li><li> Vérifiez les réflexes pincer la queue et les pattes arrières pour être sûr que la souris est suffisant anesthésiés. </li><li> Sous vue microscopique effectuer une incision médiane cervical séparant la peau, des muscles et du tissu couvrant la trachée. </li><li> Lorsque la trachée est exposé couper un petit trou dans le tissu entre deux anneaux cartouche en dessous de la glotte pour insérer la sonde endotrachéale (figure 1). Insérez la sonde endotrachéale tenant la partie crânienne de la trachée à l&#39;aide de micro forecepts chirurgicale. Vérifiez le mouvement thoracique pour être sûr que les deux poumons sont bien aérés. </li><li> Le taux de respiration (RR) devrait être d&#39;environ 110 par minute, avec une pression inspiratoire de 17 à 18cm H 2 O. Retournez la souris attentivement, couché sur son côté droit, face à son côté gauche. Effectuer une thoracotomie leftsided entre le 3 ème et 4 ème de la côte, et de disséquer les tissus et les muscles soigneusement, en utilisant une Cauter pour prévenir les saignements. </li><li> Ouvrez le thorax attentivement, une fois le thorax est ouvert, trouver le cœur, sans toucher le poumon avec un objet pointu. Maintenant, enlevez la partie du sac péricardique qui recouvre le cœur. </li><li> Le DAL est situé entre l&#39;artère pulmonaire et l&#39;oreillette gauche. Utilisez un 8-0 Prolène suture (Ethicon, Norderstedt, Allemagne) pour ligaturer l&#39;artère interventriculaire antérieure proximale avec une suture simple (figure 2). </li><li> Placer un drain thoracique (28G, un cathéter veineux), entre le 4 ème et 5 ème de la côte. </li><li> Fermer l&#39;incision thoracique en couches, en utilisant 6-0 Prolène sutures course (Ethicon, Norderstedt, Allemagne) pour adapter les côtes et les points de suture Prolène 4-0 fonctionnement (Ethicon, Norderstedt, Allemagne) pour fermer la peau. </li><li> Égoutter le thorax à l&#39;aide d&#39;une seringue 2ml soigneusement (figure 3). Placez la souris sur son dos. Maintenant, prenez la sonde endotrachéale et d&#39;adapter les anneaux cartouche trachéale avec un point unique à l&#39;aide des sutures 7-0 Prolène (Ethicon, Norderstedt, Allemagne). </li><li> Placez le masque sur la souris et fermer la peau à l&#39;aide Prolène 4-0 courir sutures (Ethicon, Norderstedt, Allemagne). </li></ol> Validation Il existe différentes possibilités pour confirmer le succès de la LAD-ligature. Le test de la troponine peut être effectuée 6 à 18 heures après la chirurgie, en utilisant seulement 150 L de sang, sans la nécessité d&#39;euthanasier l&#39;animal. Le sang est appliqué à un kit de test personnalisés troponine (T TROP sensible, Roche, Mannheim) (figure 4). La troponine est une protéine régulatrice dans les filaments d&#39;actine de la cellule musculaire, il ya différents isotypes dans les trois types de muscles. La cTnI et de cTnT isotypes sont trouvés dans le cœur et sont libérés des lésions tissulaires. Le test normalisé pour la troponine T (cTnT) est basé sur deux anticorps monoclonaux spécifiques du cœur, l&#39;un des pièges de la troponine dans l&#39;échantillon de sang, le second est un marqueur. La zone infarcie peut être identifiée macroscopiquement après 3 jours (figure 5). TTC (2,3,5-triphényltétrazolium chlorure) la viabilité des tissus coloration des mesures utilisées pour évaluer la taille d&#39;infarctus. Bleu Evans (1,5%, 1,0 ml) dans un tampon phosphate salin (PBS) est injecté dans la cavité ventriculaire gauche à mesurer la surface du myocarde ischémique. La souris est euthanasié et le cœur est récolté et sectionnés en tranches. Les tranches de tissu sont incubés dans une solution de PBS% TTC, pH 7,4 à 37 ° C pendant 20min. Les tissus sont fixés dans 10% de PBS-formol tamponné nuit à 2-8 ° C. TTC est administré ex vivo pour la teinture bleu Evans-négatif domaines (figure 6). Pour l&#39;histologie de la souris doit être euthanasié et le cœur doit être intégré pour un traitement ultérieur. Après avoir effectué des coupes en paraffine, les lames sont colorées au H &amp; E (hématoxyline-éosine) ou trichrome de visualiser les tissus fibreux (figure 7). <img src="/files/ftp_upload/1438/1438fig1.jpg" alt="Figure 1" /> Figure 1: tube trachéal. 1A: Exposed trachée, après incision cervicale ventrale. 1B: trachée est ouvert deux anneaux cartilagineux caudale au larynx. 1C: tube trachéal est insérée dans la trachée. <img src="/files/ftp_upload/1438/1438fig2.jpg" alt="Figure 2" /> Figure 2: Le coeur est exposée à travers une thoracotomie du côté gauche, le DAL est ligaturé. t &quot;&gt; <img src="/files/ftp_upload/1438/1438fig3.jpg" alt="Figure 3" /> Figure 3: Après le thorax est fermé, un drain pleural est effectué. La souris est toujours sous anesthésie. <img src="/files/ftp_upload/1438/1438fig4.jpg" alt="Figure 4" /> Figure 4: Deux lignes apparaissent après quelques minutes lorsque le test est positif de troponine. <img src="/files/ftp_upload/1438/1438fig5.jpg" alt="Figure 5" /> Figure 5: Affiche le coeur explanté. 5A: Vue macroscopique du cœur avec la zone ischémique avec une couleur fanée blanchâtre. 5B: Coupe transversale du cœur infarci, la zone ischémique montre dans le coin supérieur droit.

<ol>
	<li>Atkins, B. Z., Hueman, M. T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cellular+cardiomyoplasty+improves+diastolic+properties+of+injured+Heart.">Cellular cardiomyoplasty improves diastolic properties of injured Heart.</a> J Surg Res. 85 (2), 234-242 (1999).</li><li>Jaquet, K., KT, K. r. a. u. 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=Reduction+of+myocardial+scar+size+after+implantation+of+mesenchymal+stem+cells+in+rats:+what+is+the+mechanism.">Reduction of myocardial scar size after implantation of mesenchymal stem cells in rats: what is the mechanism.</a> Stem Cells Dev. 14 (3), 299-309 (2005).</li><li>Joung, B., Kim, I. K. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Bone+marrow+mononuclear+stem+cells+transplanted+in+rat+infarct+myocardium+improved+the+electrical+conduction+without+evidence+of+proarrhythmic+effects.">Bone marrow mononuclear stem cells transplanted in rat infarct myocardium improved the electrical conduction without evidence of proarrhythmic effects.</a> Yonsei Med J. 48 (5), 754-764 (2007).</li></ol>

Financement La présente étude a été soutenue par l&#39;Université de Hambourg Hôpital (MK, Femme Habilitation Grant), DFG (SS, SCHR992/3-1), ISHLT (TD, 2009 Prix de recherche). Déclaration Tous les animaux ont reçu des soins humains en conformité avec les Principes de protection des animaux de laboratoire, des expériences sur les animaux ont été effectuées en conformité avec les directives et règlements établis par la Société nationale pour la recherche médicale et le Guide pour les soins et l&#39;utilisation des animaux de laboratoire publié par le National Institutes of Health (Instituts nationaux de santé de publication 85-23, révisée en 1985). Tous les animaux ont été obtenus à partir de Charles River Laboratories (Sulzfeld, Allemagne) et ont été maintenus dans les installations de soins aux animaux de l&#39;Hôpital universitaire Eppendorf à Hambourg. Les animaux ont reçu la norme chow et eau ad libitum.

En résumé, cette vidéo permet de visualiser le modèle DAL-ligature, étape par étape, et identifie les données DAL-ligature des souris aussi facilement réalisables procédures chirurgicales.

lad-ligation: a murine model of myocardial infarction

Les modèles de recherche de l&#39;infarctus et l&#39;ischémie myocardique sont indispensables pour étudier les processus aigus et chroniques pathobiologiques et physiopathologiques de l&#39;ischémie myocardique et de développer et d&#39;optimiser le traitement futur. Deux méthodes différentes de créer une ischémie myocardique sont effectuées sur des rongeurs de laboratoire. La première méthode est de créer cryo infarctus, une technique rapide mais inexacte, où un cryo-plume est appliqué sur la surface du cœur (1-3). En utilisant cette méthode, le chercheur ne peut garantir que la cryo-cicatriciel entraîne une ischémie, également une blessure vastes du myocarde est créé, qui montre que les effets secondaires physiopathologiques sont pas liés à un infarctus du myocarde. La deuxième méthode est la ligature permanente de l&#39;artère interventriculaire antérieure (AIA). Ici, le DAL est ligaturé avec un point unique, formant une ischémie qui peut être vu presque immédiatement. En fermant la DAL, aucun flux sanguin supplémentaire est permise dans cette zone, tandis que les tissus environnants du myocarde est presque pas affecté. Cette intervention chirurgicale imite les aspects pathobiologiques et physiopathologiques se produisant dans l&#39;infarctus liés à l&#39;ischémie myocardique. La méthode introduite dans cette vidéo démontre la procédure chirurgicale d&#39;un modèle de souris infarctus par ligature de la LAD. Ce modèle est pratique pour les études pathobiologiques et physiopathologiques ainsi que sur les immunobiologiques infarctus du myocarde. La technique montrée offre une grande précision et une bonne corrélation avec les coupes histologiques.

Watch this Scientific Journal Video about LAD-Ligation: A Murine Model of Myocardial Infarction at JoVE.com

LAD-Ligation: A Murine Model of Myocardial Infarction

Cette vidéo montre comment utiliser un modèle rapide et fiable pour étudier les processus pathobiologiques et physiopathologiques de l&#39;ischémie myocardique.

DAL-Ligature: un modèle murin d&#39;infarctus du myocarde

Research models of infarction and myocardial ischemia are essential to investigate the acute and chronic pathobiological and pathophysiological processes ...

lad-ligation-a-murine-model-of-myocardial-infarction

Research

JoVE Journal

Biology

44.4K vues.  University Heart Center Hamburg. Cette vidéo montre comment utiliser un modèle rapide et fiable pour étudier les processus pathobiologiques et physiopathologiques de l'ischémie myocardique.

Vidéo: LAD-Ligation: A Murine Model of Myocardial Infarction

Murine Pancreatic Islet Isolation

Isolement murin îlots pancréatiques

Recherche

Biologie

Murine Model of Hindlimb Ischemia 

In the United States, peripheral arterial disease (PAD) affects about 10 million individuals, and is also prevalent worldwide. Medical therapies for symptomatic relief are limited. Surgical or endovascular interventions are useful for some individuals, but long-term results are often disappointing. As a result, there is a need for developing new therapies to treat PAD. The murine hindlimb ischemia preparation is a model of PAD, and is useful for testing new therapies. When compared to other models of tissue ischemia such as coronary or cerebral artery ligation, femoral artery ligation provides for a simpler model of ischemic tissue. Other advantages of this model are the ease of access to the femoral artery and low mortality rate. 
In this video, we demonstrate the methodology for the murine model of unilateral hindimb ischemia. The specific materials and procedures for creating and evaluating the model will be described, including the assessment of limb perfusion by laser Doppler imaging. This protocol can also be utilized for the transplantation and non-invasive tracking of cells, which is demonstrated by Huang et al.1.

Murine Model of Hindlimb Ischemia

The surgical procedure for induction of unilateral hindlimb ischemia is demonstrated, with confirmation of ischemia by laser Doppler perfusion imaging.

Modèle murin d&#39;ischémie des membres postérieurs

In the United States, peripheral arterial disease (PAD) affects about 10 million individuals, and is also prevalent worldwide.  Medical therapies for ...

Murine Renal Transplantation Procedure

Renal orthotopic transplantation in mice is a technically challenging procedure. Although the first kidney transplants in mice were performed by Russell et al over 30 years ago (1) and refined by Zhang et al years later (2), few people in the world have mastered this procedure. In our laboratory we have successfully performed 1200 orthotopic kidney transplantations with &gt; 90% survival rate. The key points for success include stringent control of reperfusion injury, bleeding and thrombosis, both during the procedure and post-transplantation, and use of 10-0 instead of 11-0 suture for anastomoses.
Post-operative care and treatment of the recipient is extremely important to transplant success and evaluation. All renal graft recipients receive antibiotics in the form of an injection of penicillin immediately post-transplant and sulfatrim in the drinking water continually. Overall animal health is evaluated daily and whole blood creatinine analyses are performed routinely with a portable I-STAT machine to assess graft function.

Renal transplantation in mice is a technically challenging procedure that requires careful post-operative care and treatment for success.

Murin procédure transplantation rénale

Renal orthotopic transplantation in mice is a technically challenging procedure. Although the first kidney transplants in mice were performed by Russell ...

Efficient Production and Purification of Recombinant Murine Kindlin-3 from Insect Cells for Biophysical Studies

Kindlins are essential coactivators, with talin, of the cell surface receptors&#160;integrins and also participate in integrin outside-in signalling, and the control of gene transcription in the cell nucleus. The kindlins are ~75 kDa multidomain proteins and bind to an NPxY motif and upstream T/S cluster of the integrin &#946;-subunit cytoplasmic tail. The hematopoietically-important kindlin isoform, kindlin-3, is critical for platelet aggregation during thrombus formation, leukocyte rolling in response to infection and inflammation and osteoclast podocyte formation in bone resorption. Kindlin-3&#39;s role in these processes has resulted in extensive cellular and physiological studies. However, there is a need for an efficient method of acquiring high quality milligram quantities of the protein for further studies. We have developed a protocol, here described, for the efficient expression and purification of recombinant murine kindlin-3 by use of a baculovirus-driven expression system in Sf9 cells yielding sufficient amounts of high purity full-length protein to allow its biophysical characterization. The same approach could be taken in the study of the other mammalian kindlin isoforms.

Kindlins are fundamental to cell adhesion through integrins but studies of them have been hampered by the difficulty encountered in expressing them recombinantly in bacterial hosts. We describe here methods for their efficient production in baculovirus-infected insect cells.

La production efficace et purification de recombinant murin Kindlin-3 à partir de cellules d&#39;insectes pour les études biophysiques

Kindlins are essential coactivators, with talin, of the cell surface receptors&#160;integrins and also participate in integrin outside-in signalling, and ...

Isolation of Murine Coronary Vascular Smooth Muscle Cells

While the isolation and culture of vascular smooth muscle cells (VSMCs) from large vessels is well established, we sought to isolate and culture VSMCs from the coronary circulation. Hearts with intact aortic arches were removed and perfused via retrograde Langendorff with digestion solution containing 300 Units/ml of collagenase type II, 0.1 mg/ml soybean trypsin inhibitor and 1 M CaCl2. The perfusates were collected at 15 min intervals for 90 min, pelleted by centrifugation, resuspended in plating media, and plated on tissue culture dishes. VSMCs were characterized by presence of SM22&#945;, &#945;-SMA, and vimentin. One of the main advantages of using this technique is the ability to isolate VSMCs from the coronary circulation of mice. Although the small number of cells obtained can limit some of the applications for which the cells can be utilized, isolated coronary VSMCs can be used in a variety of well-established cell culture techniques and assays. Studies investigating VSMCs from genetically modified mice can provide further information about structure-function and signaling processes associated with vascular pathologies.

The purpose of this protocol is to demonstrate the isolation and culture techniques of murine primary vascular smooth muscle cells (VSMCs) from the coronary circulation. Once VSMCs have been isolated, they can be used for many standard culture techniques.

Isolement de murin coronaire vasculaires cellules de muscle lisse

While the isolation and culture of vascular smooth muscle cells (VSMCs) from large vessels is well established, we sought to isolate and culture VSMCs ...

Rodent Working Heart Model for the Study of Myocardial Performance and Oxygen Consumption

Isolated working heart models have been used to understand the effects of loading conditions, heart rate and medications on myocardial performance in ways that cannot be accomplished in vivo. For example, inotropic medications commonly also affect preload and afterload, precluding load-independent assessments of their myocardial effects in vivo. Additionally, this model allows for sampling of coronary sinus effluent without contamination from systemic venous return, permitting assessment of myocardial oxygen consumption. Further, the advent of miniaturized pressure-volume catheters has allowed for the precise quantification of markers of both systolic and diastolic performance. We describe a model in which the left ventricle can be studied while performing both volume and pressure work under controlled conditions. 
In this technique, the heart and lungs of a Sprague-Dawley rat (weight 300-500 g) are removed en bloc under general anesthesia. The aorta is dissected free and cannulated for retrograde perfusion with oxygenated Krebs buffer. The pulmonary arteries and veins are ligated and the lungs removed from the preparation. The left atrium is then incised and cannulated using a separate venous cannula, attached to a preload block. Once this is determined to be leak-free, the left heart is loaded and retrograde perfusion stopped, creating the working heart model. The pulmonary artery is incised and cannulated for collection of coronary effluent and determination of myocardial oxygen consumption. A pressure-volume catheter is placed into the left ventricle either retrograde or through apical puncture. If desired, atrial pacing wires can be placed for more precise control of heart rate. This model allows for precise control of preload (using a left atrial pressure block), afterload (using an afterload block), heart rate (using pacing wires) and oxygen tension (using oxygen mixtures within the perfusate).

Isolated working heart models can be used to measure the effect of loading conditions, heart rate, and medications on myocardial performance and oxygen consumption. We describe methods for preparation of a rodent left heart working model that permits study of systolic and diastolic performance and oxygen consumption under various conditions.

Rongeur de travail Modèle de coeur pour l&#39;étude de la performance myocardique et la consommation d&#39;oxygène

Isolated working heart models have been used to understand the effects of loading conditions, heart rate and medications on myocardial performance in ways ...

The Murine Choline-Deficient, Ethionine-Supplemented (CDE) Diet Model of Chronic Liver Injury

Chronic liver diseases, such as viral hepatitis, alcoholic liver disease, or non-alcoholic fatty liver disease, are characterized by continual inflammation, progressive destruction and regeneration of the hepatic parenchyma, liver progenitor cell proliferation, and fibrosis. The end-stage of every chronic liver disease is cirrhosis, a major risk factor for the development of hepatocellular carcinoma. To study processes regulating disease initiation, establishment, and progression, several animal models are used in laboratories. Here we describe a six-week time course of the choline-deficient and ethionine-supplemented (CDE) mouse model, which involves feeding six-week old male C57BL/6J mice with choline-deficient chow and 0.15% DL-ethionine-supplemented drinking water. Monitoring of animal health and a typical body weight loss curve are explained. The protocol demonstrates the gross examination of a CDE-treated liver and blood collection by cardiac puncture for subsequent serum analyses. Next, the liver perfusion technique and collection of different hepatic lobes for standard evaluations are shown, including liver histology assessments by hematoxylin and eosin or Sirius Red stainings, immunofluorescent detection of hepatic cell populations as well as transcriptome profiling of the liver microenvironment. This mouse model is suitable for studying inflammatory, fibrogenic, and liver progenitor cell dynamics induced through chronic liver disease and can be used to test potential therapeutic agents that may modulate these processes.

The Murine Choline-Deficient, Ethionine-Supplemented CDE Diet Model of Chronic Liver Injury

Here we describe a common method to induce chronic liver injury in mice by feeding of a choline-deficient and ethionine-supplemented (CDE) diet. We demonstrate health monitoring, liver perfusion, isolation, and preservation. A time course of six weeks can inform about liver injury, pathohistology, fibrosis, inflammatory, and liver progenitor cell responses.

Le murin déficients en Choline, additionné d’éthionine (CDE) alimentation modèle d’atteinte hépatique chronique

Chronic liver diseases, such as viral hepatitis, alcoholic liver disease, or non-alcoholic fatty liver disease, are characterized by continual ...

A Murine Model of Vertical Sleeve Gastrectomy

Bariatric surgery, such as vertical sleeve gastrectomy (VSG), is a surgery of the gastrointestinal tract that is performed for the purpose of weight loss. Bariatric surgery is currently the most effective long-term treatment for obesity. In addition to weight loss, bariatric surgery produces additional health benefits such as remission of type 2 diabetes, remission of hypertension, and decreased risk of developing certain types of cancer. The mechanisms beyond weight loss for these benefits remain incompletely defined. Therefore, animal models of bariatric surgery are being developed and validated to identify the mechanisms leading to these benefits, with the goal of improving understanding of gastrointestinal physiology and identifying new therapeutic targets. VSG has become the most commonly performed bariatric procedure in the clinic in the United States because it is highly effective at producing weight loss and metabolic improvement, and is simpler to perform than other bariatric procedures. Therefore, we have developed and validated a murine model of VSG. This murine VSG model recapitulates many of the effects of VSG seen in humans, including improved glucose and blood pressure regulation. The method is based on isolation of the stomach, ligation of gastric vessels, and removal of 70% of the stomach by transecting along the greater curvature of the stomach. We have successfully applied this surgical protocol to various genetically modified mouse lines to define the mechanistic contributors to the benefits of VSG. Furthermore, this murine VSG model has been combined with other surgical techniques, to achieve deeper mechanistic insight. Therefore, this is a simple and versatile model for studying gastrointestinal physiology and the health benefits of bariatric surgery.

The following describes the performance of vertical sleeve gastrectomy in mice. This is a type of weight-loss surgery that involves removal of approximately 70% of the stomach.

Un modèle murin de gastrectomie verticale

Bariatric surgery, such as vertical sleeve gastrectomy (VSG), is a surgery of the gastrointestinal tract that is performed for the purpose of weight loss. ...

Mass Spectrometry Analysis to Identify Ubiquitylation of EYFP-tagged CENP-A (EYFP-CENP-A)

Studying the structure and the dynamics of kinetochores and centromeres is important in understanding chromosomal instability (CIN) and cancer progression. How the chromosomal location and function of a centromere (i.e., centromere identity) are determined and participate in accurate chromosome segregation is a fundamental question. CENP-A is proposed to be the non-DNA indicator (epigenetic mark) of centromere identity, and CENP-A ubiquitylation is required for CENP-A deposition at the centromere, inherited through dimerization between cell division, and indispensable to cell viability.
Here we describe mass spectrometry analysis to identify ubiquitylation of EYFP-CENP-A K124R mutant suggesting that ubiquitylation at a different lysine is induced because of the EYFP tagging in the CENP-A K124R mutant protein. Lysine 306 (K306) ubiquitylation in EYFP-CENP-A K124R was successfully identified, which corresponds to lysine 56 (K56) in CENP-A through mass spectrometry analysis. A caveat is discussed in the use of GFP/EYFP or the tagging of high molecular weight protein as a tool to analyze the function of a protein. Current technical limit is also discussed for the detection of ubiquitylated bands, identification of site-specific ubiquitylation(s), and visualization of ubiquitylation in living cells or a specific single cell during the whole cell cycle.
The method of mass spectrometry analysis presented here can be applied to human CENP-A protein with different tags and other centromere-kinetochore proteins. These combinatory methods consisting of several assays/analyses could be recommended for researchers who are interested in identifying functional roles of ubiquitylation.

Mass Spectrometry Analysis to Identify Ubiquitylation of EYFP-tagged CENP-A EYFP-CENP-A

CENP-A ubiquitylation is an important requirement for CENP-A deposition at the centromere, inherited through dimerization between cell division, and indispensable to cell viability. Here we describe mass spectrometry analysis to identify ubiquitylation of EYFP-tagged CENP-A (EYFP-CENP-A) protein.

Analyse de spectrométrie de masse pour identifier l’ubiquité de cenp-A marqué par EYFP (EYFP-CENP-A)

Studying the structure and the dynamics of kinetochores and centromeres is important in understanding chromosomal instability (CIN) and cancer ...

Isolation of Human Ventricular Cardiomyocytes from Vibratome-Cut Myocardial Slices

The isolation of ventricular cardiac myocytes from animal and human hearts is a fundamental method in cardiac research. Animal cardiomyocytes are commonly isolated by coronary perfusion with digestive enzymes. However, isolating human cardiomyocytes is challenging because human myocardial specimens usually do not allow for coronary perfusion, and alternative isolation protocols result in poor yields of viable cells. In addition, human myocardial specimens are rare and only regularly available at institutions with on-site cardiac surgery. This hampers the translation of findings from animal to human cardiomyocytes. Described here is a reliable protocol that enables efficient isolation of ventricular myocytes from human and animal myocardium. To increase the surface-to-volume ratio while minimizing cell damage, myocardial tissue slices 300 &#181;m thick are generated from myocardial specimens with a vibratome. Tissue slices are then digested with protease and collagenase. Rat myocardium was used to establish the protocol and quantify yields of viable, calcium-tolerant myocytes by flow-cytometric cell counting. Comparison with the commonly used tissue-chunk method showed significantly higher yields of rod-shaped cardiomyocytes (41.5 &#177; 11.9 vs. 7.89 &#177; 3.6%, p &#60; 0.05). The protocol was translated to failing and non-failing human myocardium, where yields were similar as in rat myocardium and, again, markedly higher than with the tissue-chunk method (45.0 &#177; 15.0 vs. 6.87 &#177; 5.23 cells/mg, p &#60; 0.05). Notably, with the protocol presented it is possible to isolate reasonable numbers of viable human cardiomyocytes (9&#8211;200 cells/mg) from minimal amounts of tissue (&#60;50 mg). Thus, the method is applicable to healthy and failing myocardium from both human and animal hearts. Furthermore, it is possible to isolate excitable and contractile myocytes from human tissue specimens stored for up to 36 h in cold cardioplegic solution, rendering the method particularly useful for laboratories at institutions without on-site cardiac surgery.

Presented is a protocol for the isolation of human and animal ventricular cardiomyocytes from vibratome-cut myocardial slices. High yields of calcium-tolerant cells (up to 200 cells/mg) can be obtained from small amounts of tissue (&#60;50 mg). The protocol is applicable to myocardium exposed to cold ischemia for up to 36 h.

Isolement des cardiomyocytes ventriculaires humains des tranches myocardales vibratoires-cut

The isolation of ventricular cardiac myocytes from animal and human hearts is a fundamental method in cardiac research. Animal cardiomyocytes are commonly ...