Les auteurs ne ont aucun des accusés de réception.

Toutes les procédures d&#39;animaux ont été effectués avec l&#39;approbation du soin et l&#39;utilisation Commission institutionnelle animale de l&#39;Université de Cincinnati et en conformité avec le Guide de soin et l&#39;utilisation des animaux de laboratoire des National Institutes of Health (NIH Publication No. 85-23, révisée en 1996). 1. Préparation de la souris <ol><li> Euthanasier en exposant l&#39;animal à une dose d&#39;anesthésique suprathérapeutique, isoflurane inhalé à effet. Vérifiez l&#39;euthanasie primaire par pincement de l&#39;orteil comme un stimulus nociceptif. Méthode secondaire de l&#39;euthanasie, la coupe de la membrane, se produira dans une étape prochaine. D&#39;autres méthodes peuvent être utilisées euthanasie accordé est obtenu. </li><li> Sanitizie la surface externe de la souris par pulvérisation de la fourrure le long de la région abdominale, où les réductions initiales seront faites, avec 70% d&#39;éthanol au point d&#39;humidité, de sorte que la fourrure est mouillé avec de l&#39;éthanol et des poils / sec ne entrent pas la région. </li><li> Placez la souris sur une surgique conseil en décubitus dorsal avec des appendices supérieures et inférieures étendu vers l&#39;extérieur. </li><li> Appendices sécurisés au conseil l&#39;aide de ruban chirurgical. </li></ol> 2. Isolement du Cœur et de l&#39;aorte <ol><li> Après un bon positionnement de la souris, utiliser une pince pour localiser et isoler la peau abdominale juste inférieure à la pointe du sternum du sternum. </li><li> Créer des tensions en soulevant la peau vers le haut et utiliser des ciseaux pour enlever la peau superficielle, exposant la partie supérieure du péritoine et de la partie inférieure de la cavité thoracique. </li><li> Entrez la cavité péritonéale en soulevant le processus de xiphoïde et faire des incisions latérales juste inférieurs au processus le long des marges sous-costale. </li><li> Disséquer dans la cavité thoracique, en passant par le diaphragme, en étant sûr de ne pas déchirer le coeur ou des gros vaisseaux sanguins. </li><li> Étendre les incisions latérales faites à l&#39;étape 2.3 crânienne pour enlever la partie antérieure de la cage thoracique. Sinécessaire, libérer le cœur de la paroi thoracique antérieure utilisant dissection. </li><li> Nettoyez la cavité thoracique de sang étrangère et fluide en utilisant la gaze stérile pour absorber la matière. Une fois que la zone est plus visible, retirez les poumons afin de mieux exposer le coeur et l&#39;aorte. </li></ol> 3. perfusion du cœur et de l&#39;aorte NOTE: Pour obtenir le sang par ponction cardiaque, le faire juste avant cette étape. <ol><li> Remplir une seringue de 10 cc avec 10 ml de solution de tampon de phosphate de glace stérile 1x froid (PBS), et fixer une aiguille de calibre 25 à la seringue. </li><li> Insérez délicatement l&#39;aiguille dans le ventricule gauche du cœur. </li><li> Couper l&#39;oreillette droite pour atténuer l&#39;accumulation de la pression de perfusion. Perfuser le contenu de la seringue dans la souris sur 2-3 min. </li><li> Utilisation de la gaze stérile à l&#39;ouverture dans l&#39;oreillette droite à absorber le fluide de perfusion. </li></ol> 4. Isolement et Excision de l&#39;aorte <ol><li> À la fin de perfusion, utiliser une compresse stérile pour absorber tout liquide restant brouiller le champ de vision dans la cavité thoracique. </li><li> Exposer le contenu gastro-intestinaux en coupant caudalement travers la paroi abdominale, étendant l&#39;incision à la zone sus-pubienne. Elargir l&#39;incision de plus vers les membres inférieurs bilatérale pour créer lambeaux de peau qui peut être maintenu au sol ou excisées. </li><li> Retirez les lobes du foie, du pancréas, de l&#39;estomac, la rate, les intestins et de mieux visualiser l&#39;aorte. Faites attention lorsque vous disséquer près de la région péri-rénale, que l&#39;aorte est superficielle aux branches des artères rénales. REMARQUE: Effectuez cette étape dans un précis et immatriculer manière que le tractus gastro-intestinal est riche avec des bactéries qui augmente la propension à la contamination. </li><li> Rincer la zone avec PBS 1x et enlever tout le liquide par absorption avec une gaze stérile. </li><li> Utilisation microciseaux et microforceps stériles, séparer l&#39;aorte de la face dorsale de la colonne vertébrale et l&#39;œsophage ventrale.Il est préférable d&#39;utiliser dissection et en utilisant un microscope de dissection pour cela. NOTE: En isolant l&#39;aorte, commencer caudale à la bifurcation iliaque et déplacer crânialement nettoyage et la séparation de l&#39;aorte de la surface dorsale de la cavité crânienne ou commencer à les carotides et les artères de brachiocéphaliques dissection caudale. Chaque méthode est appropriée et à la chercheurs confort. </li><li> Retirez le tissu adipeux périvasculaire utilisant microciseaux fines en étant sûr de ne pas enlever une partie de la paroi aortique. Cela est essentiel pour minimiser le risque de contamination lors de la mise en culture de fibroblastes de cellules musculaires lisses aortiques. </li></ol>

<ol>
	<li>Go, A. 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=Heart+disease+and+stroke+statistics--2014+update:+a+report+from+the+American+Heart+Association.">Heart disease and stroke statistics--2014 update: a report from the American Heart Association.</a> Circulation. 129 (3), 28-292 (2014).</li><li>Ross, R., Harker, L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Hyperlipidemia+and+atherosclerosis.">Hyperlipidemia and atherosclerosis.</a> Science. 193 (4258), 1094-1100 (1976).</li><li>Clouse, W. 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=Acute+aortic+dissection:+population-based+incidence+compared+with+degenerative+aortic+aneurysm+rupture.">Acute aortic dissection: population-based incidence compared with degenerative aortic aneurysm rupture.</a> Mayo Clin Proc. 79 (2), 176-180 (2004).</li><li>Daugherty, A., Cassis, L. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Mouse+models+of+abdominal+aortic+aneurysms.">Mouse models of abdominal aortic aneurysms.</a> Arterioscler Thromb Vasc Biol. 24 (3), 429-434 (2004).</li><li>Pleumeekers, H. J., 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=Aneurysms+of+the+abdominal+aorta+in+older+adults.+The+Rotterdam+Study.">Aneurysms of the abdominal aorta in older adults. The Rotterdam Study.</a> Am J Epidemiol. 142 (12), 1291-1299 (1995).</li><li>Brophy, C. M., Reilly, J. M., Smit, G. J., Tilson, M. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+role+of+inflammation+in+nonspecific+abdominal+aortic+aneurysm+disease.">The role of inflammation in nonspecific abdominal aortic aneurysm disease.</a> Ann Vasc Surg. 5 (3), 229-233 (1991).</li><li>Ray, J. L., Leach, R., Herbert, J. M., Benson, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Isolation+of+vascular+smooth+muscle+cells+from+a+single+murine+aorta.">Isolation of vascular smooth muscle cells from a single murine aorta.</a> Methods Cell Sci. 23 (4), 185-188 (2001).</li><li>Weiss, R. G. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Imaging+the+murine+cardiovascular+system+with+magnetic+resonance.">Imaging the murine cardiovascular system with magnetic resonance.</a> Circ Res. 88 (6), 550-551 (2001).</li><li>Graham, E. L., Balla, C., Franchino, H., Melman, Y., del Monte, F., Das, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Isolation+culture,+and+functional+characterization+of+adult+mouse+cardiomyoctyes.">Isolation culture, and functional characterization of adult mouse cardiomyoctyes.</a> J Vis Exp. (79), 50289 (2013).</li><li>Wassef, M., Upchurch, G. R., Kuivaniemi, H., Thompson, R. W., Tilson, M. D. 3. r. d. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Challenges+and+opportunities+in+abdominal+aortic+aneurysm+research.">Challenges and opportunities in abdominal aortic aneurysm research.</a> J Vasc Surg. 45 (1), 192-198 (2007).</li></ol>

Les auteurs ne ont rien à divulguer.

Aortic disease can lead to significant systemic pathology and possibly death in severe cases. Treatment options are currently limited therefore continued research in the field is necessary10. Murine models are ideal to further study disease progression and potentially therapeutic options4. Therefore, the successful completion of the method described in this manuscript will provide investigators with the tools to measure disease progression and drug efficacy. 
This techniq...

L&#39;aorte joue un rôle pivot dans la fonction cardiovasculaire fournissant le corps avec le sang oxygéné et d&#39;autres parties semblables à de l&#39;organisme, est sensible à la maladie. Maladies aortiques communs incluent l&#39;athérosclérose et anévrisme, qui sont les résultats de facteurs génétiques et environnementaux, y compris l&#39;alimentation, le tabagisme et la sédentarité 1. L&#39;athérosclérose est le dépôt de calcium et une plaque à base de lipides sur la paroi aortique typiquement trouvés chez des patients atteints d&#39;hyperlipidémie chronique 2. Les anévrismes sont caractérisés par une dégradation des composants structuraux de l&#39;aorte et l&#39;amincissement de la paroi du vaisseau, suivie d&#39;une augmentation de diamètre qui peut finalement conduire à la rupture 3. Les modèles animaux sont des outils importants utilisés pour étudier le mécanisme de la maladie et l&#39;efficacité des traitements potentiels. Modèles animaux couramment utilisés en recherche cardiovasculaire, la recherche spécifiquement enquête vasculaires et métaboliquesinclure des souris génétiquement modifiées pour modifier les taux de lipides tels que le knock-out de gène de l&#39;apolipoprotéine E et de lipoprotéines de faible densité des souris knock-out du gène du récepteur 4. La majorité des méthodes pour évaluer les mécanismes de la maladie et l&#39;efficacité de la thérapie comprendrait l&#39;isolement et l&#39;excision de l&#39;aorte. Une fois que l&#39;aorte est localisé et isolé, l&#39;analyse morphométrique peut être déterminée, comme la présence de l&#39;anévrisme, généralement définie comme une augmentation supérieure à 50% dans 5 diamètre. Après nécessaire analyse in situ est terminée, l&#39;aorte peut être excisé pour une analyse ultérieure. Une aorte excisée peut être surgelé de mener des études moléculaires tels que les protéines et / ou des essais d&#39;expression génique ou fixe en utilisant 4% de paraformaldehyde, puis incorporé, en coupe et colorées pour l&#39;analyse histologique. L&#39;analyse histologique de l&#39;aorte peut démontrer des caractéristiques communes de la maladie aortique tels que la dégradation structurelle, la formation de plaque, et l&#39;infiltration de leucocytes &lt;sup&gt; 6,7. En outre, une aorte excisée peut être utilisé pour isoler des lignées de cellules primaires y compris des cellules endotheliales et des muscles lisses qui peuvent ensuite être utilisés pour une variété d&#39;études in vitro 7. Actuellement, il n&#39;y a pas d&#39;autres méthodes pour fournir cette caractérisation en profondeur de la maladie aortique ainsi que de fournir aux chercheurs des outils d&#39;étudier plus avant les maladies cardiovasculaires. Les modalités d&#39;imagerie telles que l&#39;imagerie par résonance magnétique, la tomodensitométrie et l&#39;échographie sont les plus proches des méthodes pour évaluer morphologiquement l&#39;aorte, mais ce est difficile chez les petits animaux et d&#39;obtenir un dispositif avec la technologie adéquate est cher 8. Les lignées cellulaires immortalisées peuvent être achetés pour étudier les mécanismes potentiels de la maladie et l&#39;efficacité des thérapies, mais le caractère artificiel de ces cellules limitent à étudier les effets sur le cycle de vie cellulaire et l&#39;apoptose neuf. L&#39;objectif global dece manuscrit est de démontrer l&#39;isolement stérile et l&#39;excision de l&#39;aorte murin dans l&#39;enquête sur les maladies cardiovasculaires.

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isolation and excision of murine aorta; a versatile technique in the study of cardiovascular disease

Cardiovascular disease is a broad term describing disease of the heart and/or blood vessels. The main blood vessel supplying the body with oxygenated blood is the aorta. The aorta may become affected in diseases such as atherosclerosis and aneurysm. Researchers investigating these diseases would benefit from direct observation of the aorta to characterize disease progression as well as to evaluate efficacy of potential therapeutics. The goal of this protocol is to describe proper isolation and excision of the aorta to aid investigators researching cardiovascular disease. Isolation and excision of the aorta allows investigators to look at gross morphometric changes as wells as allowing them to preserve and stain the tissue to look at histologic changes if desired. The aorta may be used for molecular studies to evaluate protein and gene expression to discover targets of interest and mechanisms of action. This technique is superior to imaging modalities as they have inherent limitations in technology and cost. Additionally, primary isolated cells from a freshly isolated and excised aorta can allowing researchers to perform further in situ and in vitro assays. The isolation and excision of the aorta has the limitation of having to sacrifice the animal however, in this case the benefits outweigh the harm as it is the most versatile technique in the study of aortic disease.

Après achèvement de la procédure, il y aura une aorte intacte provenant du cœur, diminuant dans les cavités thoracique et abdominale avec les artères rénales encore attachées (figure 1A). De là, l&#39;aorte peut être imagé in situ pour quantifier les changements morphométriques qui sont diagnostic dans l&#39;étude des anévrismes aortiques abdominaux (Figure 1B et 1C). Par la suite, l&#39;aorte peut être retiré, fixées et colorées d&#39;examine...

Watch this Scientific Journal Video about Isolation and Excision of Murine Aorta; A Versatile Technique in the Study of Cardiovascular Disease at JoVE.com

Isolation and Excision of Murine Aorta; A Versatile Technique in the Study of Cardiovascular Disease

Pathology of the aorta can lead to severe morbidity and mortality, therefore research of disease progression and potential therapies is warranted. Here, we present a protocol to isolate and excise the murine aorta to aid researchers in their investigation of cardiovascular disease.

Isolement et Excision de murin Aorte; Une technique polyvalente dans l&#39;étude des maladies cardiovasculaires

Cardiovascular disease is a broad term describing disease of the heart and/or blood vessels. The main blood vessel supplying the body with oxygenated ...

isolation-excision-murine-aorta-versatile-technique-study

Research

JoVE Journal

Medicine

32.0K vues.  University of Cincinnati College of Medicine. Pathology of the aorta can lead to severe morbidity and mortality, therefore research of disease progression and potential therapies is warranted. Here, we present a protocol to isolate and excise the murine aorta to aid researchers in their investigation of cardiovascular disease. 

Vidéo: Isolation and Excision of Murine Aorta; A Versatile Technique in the Study of Cardiovascular Disease

A Murine Model of Stent Implantation in the Carotid Artery for the Study of Restenosis

Despite the considerable progress made in the stent development in the last decades, cardiovascular diseases remain the main cause of death in western countries. Beside the benefits offered by the development of different drug-eluting stents, the coronary revascularization bears also the life-threatening risks of in-stent thrombosis and restenosis. Research on new therapeutic strategies is impaired by the lack of appropriate methods to study stent implantation and restenosis processes. Here, we describe a rapid and accessible procedure of stent implantation in mouse carotid artery, which offers the possibility to study in a convenient way the molecular mechanisms of vessel remodeling and the effects of different drug coatings.

A model of stent implantation in mouse carotid artery is described. Compared to other similar methods, this procedure is very rapid, simple and accessible, offering the possibility to study in a convenient way the vascular wall reaction to different drug-eluting stents and the molecular mechanisms of restenosis.

Un modèle murin d&#39;implantation d&#39;une endoprothèse dans l&#39;artère carotide pour l&#39;étude de la resténose

Despite  the considerable progress made in the stent development in the last decades,  cardiovascular diseases remain the main cause of death in western ...

Recherche

Médecine

Fundus Photography as a Convenient Tool to Study Microvascular Responses to Cardiovascular Disease Risk Factors in Epidemiological Studies

The microcirculation consists of blood vessels with diameters less than 150 &#181;m. It makes up a large part of the circulatory system and plays an important role in maintaining cardiovascular health. The retina is a tissue that lines the interior of the eye and it is the only tissue that allows for a non-invasive analysis of the microvasculature. Nowadays, high-quality fundus images can be acquired using digital cameras. Retinal images can be collected in 5 min or less, even without dilatation of the pupils. This unobtrusive and fast procedure for visualizing the microcirculation is attractive to apply in epidemiological studies and to monitor cardiovascular health from early age up to old age.
Systemic diseases that affect the circulation can result in progressive morphological changes in the retinal vasculature. For example, changes in the vessel calibers of retinal arteries and veins have been associated with hypertension, atherosclerosis, and increased risk of stroke and myocardial infarction. The vessel widths are derived using image analysis software and the width of the six largest arteries and veins are summarized in the Central Retinal Arteriolar Equivalent (CRAE) and the Central Retinal Venular Equivalent (CRVE). The latter features have been shown useful to study the impact of modifiable lifestyle and environmental cardiovascular disease risk factors.
The procedures to acquire fundus images and the analysis steps to obtain CRAE and CRVE are described. Coefficients of variation of repeated measures of CRAE and CRVE are less than 2% and within-rater reliability is very high. Using a panel study, the rapid response of the retinal vessel calibers to short-term changes in particulate air pollution, a known risk factor for cardiovascular mortality and morbidity, is reported. In conclusion, retinal imaging is proposed as a convenient and instrumental tool for epidemiological studies to study microvascular responses to cardiovascular disease risk factors.

Retinal image analysis is an unobtrusive procedure for visualizing the microcirculation. The impact of cardiovascular disease risk factors can result in changes of retinal vessel calibers. The procedures to acquire fundus images and the steps for calculating the vessel calibers are described.

Photographie fond comme un outil pratique pour étudier les réponses microvasculaires à des facteurs de risque de maladie cardiovasculaire dans les études épidémiologiques

The microcirculation consists of blood vessels with diameters less than 150 &#181;m. It makes up a large part of the circulatory system and plays an ...

Localization, Identification, and Excision of Murine Adipose Depots

Obesity has increased dramatically in the last few decades and affects over one third of the adult US population. The economic effect of obesity in 2005 reached a staggering sum of $190.2 billion in direct medical costs alone. Obesity is a major risk factor for a wide host of diseases. Historically, little was known regarding adipose and its major and essential functions in the body. Brown and white adipose are the two main types of adipose but current literature has identified a new type of fat called brite or beige adipose. Research has shown that adipose depots have specific metabolic profiles and certain depots allow for a propensity for obesity and other related disorders. The goal of this protocol is to provide researchers the capacity to identify and excise adipose depots that will allow for the analysis of different factorial effects on adipose; as well as the beneficial or detrimental role adipose plays in disease and overall health. Isolation and excision of adipose depots allows investigators to look at gross morphological changes as well as histological changes. The adipose isolated can also be used for molecular studies to evaluate transcriptional and translational change or for in vitro experimentation to discover targets of interest and mechanisms of action. This technique is superior to other published techniques due to the design allowing for isolation of multiple depots with simplicity and minimal contamination.

Due to the drastic and negative connection between obesity and other comorbidities, research on the role adipose plays in disease and overall health is warranted. We present a protocol for the isolation and excision of adipose depots allowing for the study of adipose using in situ and in vitro methods.

Localisation, identification, et l&#39;excision des dépôts adipeux murin

Obesity has increased dramatically in the last few decades and affects over one third of the adult US population. The economic effect of obesity in 2005 ...

Adapting Human Videofluoroscopic Swallow Study Methods to Detect and Characterize Dysphagia in Murine Disease Models

This study adapted human videofluoroscopic swallowing study (VFSS) methods for use with murine disease models for the purpose of facilitating translational dysphagia research. Successful outcomes are dependent upon three critical components: test chambers that permit self-feeding while standing unrestrained in a confined space, recipes that mask the aversive taste/odor of commercially-available oral contrast agents, and a step-by-step test protocol that permits quantification of swallow physiology. Elimination of one or more of these components will have a detrimental impact on the study results. Moreover, the energy level capability of the fluoroscopy system will determine which swallow parameters can be investigated. Most research centers have high energy fluoroscopes designed for use with people and larger animals, which results in exceptionally poor image quality when testing mice and other small rodents. Despite this limitation, we have identified seven VFSS parameters that are consistently quantifiable in mice when using a high energy fluoroscope in combination with the new murine VFSS protocol. We recently obtained a low energy fluoroscopy system with exceptionally high imaging resolution and magnification capabilities that was designed for use with mice and other small rodents. Preliminary work using this new system, in combination with the new murine VFSS protocol, has identified 13 swallow parameters that are consistently quantifiable in mice, which is nearly double the number obtained using conventional (i.e., high energy) fluoroscopes. Identification of additional swallow parameters is expected as we optimize the capabilities of this new system. Results thus far demonstrate the utility of using a low energy fluoroscopy system to detect and quantify subtle changes in swallow physiology that may otherwise be overlooked when using high energy fluoroscopes to investigate murine disease models.

This study successfully adapted human videofluoroscopic swallowing study (VFSS) methods for use with murine disease models for the purpose of facilitating translational dysphagia research.

Adaptation vidéofluoroscopie Swallow Méthodes étude humaine pour détecter et caractériser dysphagie dans les modèles murins de la maladie

This study adapted human videofluoroscopic swallowing study (VFSS) methods for use with murine disease models for the purpose of facilitating ...

A Versatile Murine Model of Subcortical White Matter Stroke for the Study of Axonal Degeneration and White Matter Neurobiology

Stroke affecting white matter accounts for up to 25% of clinical stroke presentations, occurs silently at rates that may be 5-10 fold greater, and contributes significantly to the development of vascular dementia. Few models of focal white matter stroke exist and this lack of appropriate models has hampered understanding of the neurobiologic mechanisms involved in injury response and repair after this type of stroke. The main limitation of other subcortical stroke models is that they do not focally restrict the infarct to the white matter or have primarily been validated in non-murine species. This limits the ability to apply the wide variety of murine research tools to study the neurobiology of white matter stroke. Here we present a methodology for the reliable production of a focal stroke in murine white matter using a local injection of an irreversible eNOS inhibitor. We also present several variations on the general protocol including two unique stereotactic variations, retrograde neuronal tracing, as well as fresh tissue labeling and dissection that greatly expand the potential applications of this technique. These variations allow for multiple approaches to analyze the neurobiologic effects of this common and understudied form of stroke.

Here we present methodology for the production of a focal stroke in murine white matter by local injection of an irreversible endothelial nitric oxide synthase (eNOS) inhibitor (L-Nio). Presented are two stereotactic variations, retrograde neuronal tracing, and fresh tissue labeling and dissection that expand the potential applications of this technique.

A Stroke Versatile modèle murin de Subcortical substance blanche pour l&#39;étude de axonale Degeneration et blanc Matière Neurobiologie

Stroke affecting white matter accounts for up to 25% of clinical stroke presentations, occurs silently at rates that may be 5-10 fold greater, and ...

Murine Echocardiography of Left Atrium, Aorta, and Pulmonary Artery

The present methodology teaches the investigator how to measure and use the LAV as a surrogate of chronic elevations in Left Ventricular diastolic pressure through echocardiography, as well as to obtain measurements of the Aorta and PA diameter in mice.
Mice older than 10 d of age can be analyzed using the present technique. The technique is composed of 3 main steps: set-up, image acquisition, and image analysis. The set-up step consists of getting the mouse anesthetized with 1% isoflurane, shaving it, and taping it in a supine position to a heated EKG board where the image acquisition will take place. The image acquisition step consists of learning to identify the cardiac structures and obtaining all the required images with its correspondent probe and axis in order to be able to calculate volumes and diameters. The image analysis step consists of measuring the previously acquired images with the aid of computer software.
Advantages of the proposed technique include a fast (15 min) procedure that would allow the researcher to evaluate interventions in a non-invasive, non-terminal approach and therefore follow the same mouse over time; each mouse can be used as its own control. This fact plus having the same operator perform all the acquisition and analysis for the entire experiment minimizes the limitation of operator-dependency. The present methodology is useful for mouse researchers in cardiovascular and pulmonary medicine.

The following protocol describes the methodology for the acquisition and analysis of echocardiographic images used to obtain the Left Atrial Volume (LAV), Aorta (Ao) diameter, and Pulmonary Artery (PA) diameter in mice. This technique is a non-invasive, non-terminal procedure that allows assessment of the cardiopulmonary function.

Murine échocardiographie de gauche Atrium, Aorte, et l&#39;artère pulmonaire

The present methodology teaches the investigator how to measure and use the LAV as a surrogate of chronic elevations in Left Ventricular diastolic ...

Balloon-based Injury to Induce Myointimal Hyperplasia in the Mouse Abdominal Aorta

The use of animal models is essential for a better understanding of MH, one major cause for arterial stenosis.In this article, we demonstrate a murine balloon denudation model, which is comparable with established vessel injury models in large animals. The aorta denudation model with balloon catheters mimics the clinical setting and leads to comparable pathobiological and physiological changes. Briefly, after performing a horizontal incision in the aorta abdominalis, a balloon catheter will be inserted into the vessel, inflated, and introduced retrogradely. Inflation of the balloon will lead to intima injury and overdistension of the vessel. After removing the catheter, the aortic incision will be closed with single stiches. The model shown in this article is reproducible, easy to perform, and can be established quickly and reliably. It is especially suitable for evaluating expensive experimental therapeutic agents, which can be applied in an economical fashion. By using different knockout-mouse strains, the impact of different genes on MH development can be assessed.

This article demonstrates a murine model to study the development of myointimal hyperplasia (MH) after aortic balloon injury.

Blessure axée sur le ballon pour provoquer l’hyperplasie Myointimal dans l’aorte abdominale de souris

The use of animal models is essential for a better understanding of MH, one major cause for arterial stenosis.In this article, we demonstrate a murine ...

Ultrasound Imaging of the Thoracic and Abdominal Aorta in Mice to Determine Aneurysm Dimensions

Contemporary high-resolution ultrasound instruments have sufficient resolution to facilitate the measurement of mouse aortas. These instruments have been widely used to measure aortic dimensions in mouse models of aortic aneurysms. Aortic aneurysms are defined as permanent dilations of the aorta, which occur most frequently in the ascending and abdominal regions. Sequential measurements of aortic dimensions by ultrasound are the principal approach for assessing the development and progression of aortic aneurysms in vivo. Although many reported studies used ultrasound imaging to measure aortic diameters as a primary endpoint, there are confounding factors, such as probe position and cardiac cycle, that may impact the accuracy of data acquisition, analysis, and interpretation. The purpose of this protocol is to provide a practical guide on the use of ultrasound to measure the aortic diameter in a reliable and reproducible manner. This protocol introduces the preparation of mice and instruments, the acquisition of appropriate ultrasound images, and data analysis.

Ultrasound imaging has become a common modality to determine the luminal dimensions of thoracic and abdominal aortic aneurysms in mice. This protocol describes the procedure to acquire reliable and reproducible two-dimensional ultrasound images of the ascending and abdominal aorta in mice.

Échographie de l’aorte thoracique et abdominale chez les souris pour déterminer les Dimensions de l’anévrisme

Contemporary high-resolution ultrasound instruments have sufficient resolution to facilitate the measurement of mouse aortas. These instruments have been ...

A Cryoinjury Model to Study Myocardial Infarction in the Mouse

The use of animal models is essential for developing new therapeutic strategies for acute coronary syndrome and its complications. In this article, we demonstrate a murine cryoinjury infarct model that generates precise infarct sizes with high reproducibility and replicability. In brief, after intubation and sternotomy of the animal, the heart is lifted from the thorax. The probe of a handheld liquid nitrogen delivery system is applied onto the myocardial wall to induce cryoinjury. Impaired ventricular function and electrical conduction can be monitored with echocardiography or optical mapping. Transmural myocardial remodeling of the infarcted area is characterized by collagen deposition and loss of cardiomyocytes. Compared to other models (e.g., LAD-ligation), this model utilizes a handheld liquid nitrogen delivery system to generate more uniform infarct sizes.

This article demonstrates a model to study cardiac remodeling after myocardial cryoinjury in mice.

Un modèle cryo-blessure pour étudier l'infarctus du myocarde chez la souris

The use of animal models is essential for developing new therapeutic strategies for acute coronary syndrome and its complications. In this article, we ...

Intramyocardial Transplantation of MSC-Loading Injectable Hydrogels after Myocardial Infarction in a Murine Model

One of the major issues facing current cardiac stem cell therapies for preventing postinfarct heart failure is the low retention and survival rates of transplanted cells within the injured myocardium, limiting their therapeutic efficacy. Recently, the use of scaffolding biomaterials has gained attention for improving and maximizing stem cell therapy. The objective of this protocol is to introduce a simple and straightforward technique to transplant bone marrow-derived mesenchymal stem cells (MSCs) using injectable hydroxyphenyl propionic acid (GH) hydrogels; the hydrogels are favorable as a cell delivery platform for cardiac tissue engineering applications due to their ability to be cross-linked in situ and high biocompatibility. We present a simple method to fabricate MSC-loading GH hydrogels (MSC/hydrogels) and evaluate their survival and proliferation in three-dimensional (3D) in vitro culture. In addition, we demonstrate a technique for intramyocardial transplantation of MSC/hydrogels in mice, describing a surgical procedure to induce myocardial infarction (MI) via left anterior descending (LAD) coronary artery ligation and subsequent MSC/hydrogels transplantation.

Stem cell-based therapy has emerged as an efficient strategy to repair injured cardiac tissues after myocardial infarction. We provide an optimal in vivo application for stem cell transplantation using gelatin hydrogels that are able to be enzymatically cross-linked.

Transplantation intramyocardique d’hydrogels injectables à chargement MSC après l’infarctus du myocarde dans un modèle murin

One of the major issues facing current cardiac stem cell therapies for preventing postinfarct heart failure is the low retention and survival rates of ...