Name: isolation and cryopreservation of neonatal rat cardiomyocytes
Uploaded: 2015-04-09T14:00:00.000+00:00
Duration: 7 min 5 s
Description: Watch this Scientific Journal Video about Isolation and Cryopreservation of Neonatal Rat Cardiomyocytes at JoVE.com

This work was supported by funding from American Heart Association 12BGIA12040477, NC State University Chancellor&#8217;s Faculty Excellence Program, and National Natural Science Foundation of China H020381370216.

O protocolo a seguir é projetado para o isolamento dos cardiomiócitos de uma ninhada de filhotes de ratos neonatos (10-14 filhotes). Se o tamanho da leitegada é significativamente diferente, o procedimento pode ter de ser escalado para compensar. Os filhotes devem ser em torno de 48 ± 6 horas de idade. Todos os procedimentos aqui foram aprovados pela North Carolina State University Animal Care Institucional e Comitê de Uso (IACUC). 1. Preparação cela de isolamento NOTA: Execute as seguintes etapas no dia anterior isolamento. <ol><li> Autoclave os seguintes: grandes tesouras, tesouras pequenas, pequenas pinças afiadas, grandes fórceps. Use um ciclo de gravidade durante 60 minutos a um mínimo de 121 ° C e um tempo de secagem de 30 minutos. </li><li> Colocar 40 ml de solução de tripsina a 0,1% em frigorífico para descongelar S / N. Sais Equilibrados Solução de Refrigerar Hank (HBSS) se já não estiver frio. Prepare um soro de bovino (FBS) solução de mídia estoque fetal 20%. <ol><li> Em 400 ml de Iscmeios Dulbecco modificado por ove (IMDM) adicionar 100 ml de FBS, 5 mL de L-glutamina (200 mM), 2,5 ml de gentamicina (10 mg mL -1), e 0,9 ml de 2-mercaptoetanol. Esterilizar usando filtro de vácuo. Meios Armazenar a 4 ° C durante até 3 semanas e esta é escalável para volumes maiores ou menores. Dilui-se 20% de FBS meios estoque 1: 1 com IMDM para produzir 10% de meio de FBS NRCM. Apenas fazer em pequenos lotes para evitar um aquecimento e resfriamento de mídia repetido. </li></ol></li></ol> 2. cela de isolamento Dia 1 <ol><li> Execute o seguinte trabalho em uma capa de cultura para evitar a contaminação das amostras. Para melhor momento iniciar este trabalho no período da tarde uma vez que existe um O / N incubação. </li><li> Prepare espaço de trabalho dentro de uma capa de cultura estéril. Coloque pad banco na capa de cultura. Encha dois copos de 250 ml com 70% de etanol e coloque os instrumentos cirúrgicos por eles. Coloque pequeno balde de gelo no capô. Certifique-se de que é grande o suficiente para armazenar vários tubos e um prato de 150 milímetros. UV esterilizar o capô for 10 min. Colocar 40 ml de tripsina a 0,1% em gelo. </li><li> Recuperar filhotes de ratos recém-nascidos da mãe. Para manter os animais quente até uso, coloque-os em um recipiente isolado, como um balde de gelo envolto em um bloco de banco para mantê-los aquecidos. </li><li> Encha uma 150 milímetros prato de cultura com 25 ml de HBSS e colocar no gelo. Unwrap 2-3 compressas de gaze e coloque na área de trabalho. Segurando pup pela pele na parte de trás do pescoço, pulverizá-lo com etanol e 70%, em lugar do exaustor. NOTA: Para melhor manter a esterilidade, isto é pode ser feito por uma outra pessoa que, em seguida, coloca o filhote limpo no capô. </li><li> Segurar o cachorro pela pele na parte de trás do pescoço. Em seguida, usando as grandes tesouras, em um rápido corte forte, eutanásia por decapitação. Blot o sangue com gaze. NOTA: Devido a variações nas exigências IACUC, pode ser mais apropriado para limpar o filhote com um etanol em vez de limpar aspersão. Certifique-se de verificar com a universidade IACUC como às suas diretrizes para essa etapa. </li><li> Continuar a cortar face anterior da chest através da caixa torácica. Apertar a pele no pescoço para ajudar a abrir a caixa torácica até que o coração é visível. Usando as pequenas tesouras, remover o coração e o lugar em HBSS prato de cultura em gelo. Repita o procedimento para os outros filhotes. </li><li> Remova qualquer tecido não-cardíaca a partir das amostras e agite a HBSS suavemente para lavar os corações. Transferir o tecido do coração para outro prato de cultura contendo HBSS e lavar o tecido. Corte o tecido mais até que as peças são 1-3 mm 3, e depois transferir para a solução de tripsina. Coloque solução de tripsina no balancim em 4 ° C geladeira O / N. </li></ol> Isolamento celular Dia 2 NOTA: Enquanto a aspiração nas etapas seguintes, utilizar uma pipeta, em vez de uma linha de vácuo. O tecido se move com facilidade, e uma linha de vácuo vai entupir ou remover o tecido ainda contendo células. É melhor usar uma pipeta de aspiração em seu lugar. Se o tecido entra na pipeta, pipeta de volta para removê-lo. <ol><li> Faça três alíquotas de 10% NRCM Mídia: um com 25 ml e dois com 15 ml. Coloque um tubo de 25 ml de meios de comunicação em 37 ° C banho de água. Adicionar 4 ml HBSS para 5 diferentes 15 ml tubos cônicos e coloque tudo no gelo. Escreva em cada 15 ml tubo # 1-5. </li><li> Adicionar 40 ml de HBSS para um tubo cónico de 50 ml. Adicionar 10 ml de HBSS a colagenase, pipeta para suspender, e combinar as soluções para criar 50 ml de 1 mg ml -1 solução de colagenase. Esterilizar usando 0,22 um filtro de vácuo, e armazenar à temperatura ambiente. </li><li> Recuperar coração tubo de tecido / tripsina. Certifique-se de que a tripsina é clara, e o tecido aparece fofo. Permitir que o tecido para liquidar a esquina do tubo e aspirar o máximo de líquido possível. </li><li> Adicionar 25 ml quente 10% mídia FBS NRCM ao tubo e agite com a mão. Cap e rodar em 37 ° C num banho de água durante 2 min. Aspirar líquido novamente. O tecido deve flutuar nesta etapa; em caso afirmativo, aspirado a partir do fundo do tubo. </li><li> Adicionar 10 ml de colagenase. Gire em banho-maria por 2 min ou até que a solução está turva. Quickly aspirar o líquido. Adicionar 10 ml de colagenase fresco ao tubo contendo o tecido e rodar em banho de água durante 2 min. Pipeta para misturar, solução de transferência de tubo # 1, e colocar no gelo. Pode não ser possível retirar todo o líquido. Repita os passos de 3,2-3,6 para os outros três tubos de 15 ml cônicas. Transferir o líquido remanescente para tubo # 5. </li><li> Centrifugar tubos de 15 ml a 410 rcf durante 8 min. Enquanto centrifugação, coloque 15 ml de 10% tubo de mídia FBS NRCM em banho-maria. Colocar 40 um filtro de células no topo de um tubo cónico de 50 ml e molhado com 2 ml de HBSS frio. </li><li> Aspirar o sobrenadante a partir de células centrifugadas. Adicione 6 ml frio HBSS a cada tubo e ressuspender. As suspensões de células pipeta através do filtro em 50 ml cónico para remover qualquer tecido. Lavar os lados de cada tubo de 15 ml com 3 ml de HBSS frio e adicionar ao filtro. Centrifugar células a 410 rcf durante 10 min. Aspirar o sobrenadante. Ressuspender pellet celular em 10 ml 10% de media FBS NRCM e transferência para T-75 frasco. Enxágüe cônico com media de 5 ml e adicionar à flperguntar. </li><li> Incubar durante 1 h a 37 ° C e 5% de CO 2. Coloque últimos 15 ml 10% tubo de mídia FBS NRCM em banho-maria. Conteúdo de T-75 para um novo frasco T-175 Transferir, enxaguar T-75 com 15 ml de meio e adicionar a T-175. Incubar durante 1 h. </li></ol> 4. Criopreservação <ol><li> Coloque mídia congelamento no gelo. Transferência de mídia a partir de células T-175 a 50 ml tubo cônico, e coletar 10 ml de suspensão celular para celular contagem utilizando Trypan azul. Centrifugar a 410 rcf durante 5 min. Enquanto a centrifugação, contagem de células usando um contador de células. </li><li> Aspirar meios de cultura de células, e ressuspender em meio de congelação a uma concentração de 2-4.000.000 células por ml. Coloque 1 ml de suspensão de células em criotubo, então lugar frascos uma taxa controlada de refrigeração recipiente de congelamento, e coloque no freezer -80 ° C O / N. Dentro de 1-2 dias, transferem frascos em azoto líquido. </li></ol> 5. descongelamento de células <ol><li> Prato Brasão em fibronectina dissolvendo 250 ul60; de fibronectina (concentração de 1 mg ml-1) em 9,75 ml de água (concentração final de 0,025 mg mL -1). Adicionar solução suficiente para cobrir as placas de cultura e incuba-se a 37 ° C durante pelo menos 30 min. <ol><li> Em quatro de 15 ml tubos cônicos, fazer as misturas DMSO / mídia da seguinte forma adicionando DMSO a 20% de Mídia. Adicionar (5%) 9,5 ml de meio com 500 ul de DMSO. Adicionar (2,5%) 9,75 ml de meio com 250 ul de DMSO. Adicionar 10 ml de mídia (fazer duas delas). </li></ol></li><li> Aqueça as misturas de mídia acima mencionadas em 37 ° C banho de água. Remover as células a partir de azoto líquido e colocar em gelo seco. Quando misturas de mídia são quentes, descongelar as células em 37 ° C banho de água até pouco descongelado. Não deixe as células em banho-maria por muito tempo, pois isso pode causar danos às células. </li><li> Transferir conteúdo do frasco criogênico a 5% tubo de DMSO / media. Centrifugar a 410 rcf durante 8 min. Aspirar o sobrenadante deixando sedimento celular. Adicione o conteúdo do tubo de 2,5% DMSO / media para a célula pellet e resuspend. Centrifugar a 410 rcf durante 8 min. Aspirar o sobrenadante deixando sedimento celular. </li><li> Adicionar conteúdo de um tubo de 0% DMSO / media para a célula pellet e ressuspender. Centrifugar a 410 rcf durante 8 min. Aspirar o sobrenadante deixando sedimento celular. </li><li> Adicionar conteúdo da segunda 0% DMSO / media para pellet celular e ressuspender. Tome pequena amostra para contagem de células. Centrifugar a 410 rcf durante 8 min. Enquanto centrifugação células de contagem em um hemocitómetro utilizando Trypan Blue para rotular as células mortas. Quantidade de células Record, bem como a viabilidade. </li><li> Aspirar o sobrenadante deixando sedimento celular. Ressuspender em 10% mídia NRCM (opcional: adicionar 100 bromodeoxiuridina? M (BrdU)) e células da placa em pratos revestidos com fibronectina. </li></ol> Cultura 6. celular <ol><li> As células em placas a cerca de 100k células por cm2. Ajustar a densidade de revestimento com base na utilização prevista da cultura. Prepare a 2% de meio NRCM diluindo 20% em IMDM Meios numa proporção de 1:10. O que se segue é um esboço de uma cultura típica. &lt;/ Li&gt; <li> No dia 1, lavar as células mortas afastado com IMDM morna, adicione 10% NRCM (opcional 100 M BrdU). No dia 2, lavar as células mortas afastado com IMDM morna, adicione 10% NRCM. Dia 3-adicionar 2% NRCM. No dia 4, adicionar 2% NRCM. No dia 5, assegurar que as células estão confluentes e batimento. Manter as células em cultura durante cerca de uma semana. Nesse ponto fibroblastos podem começar a superar significativamente as NRCMs. </li></ol>

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The authors have nothing to disclose.

Este protocolo permite que os NRCMs a ser isolado, criopreservadas e descongeladas. A descongelação das células é uma parte essencial do processo. Uma série de diluições de DMSO é usado para remover lentamente DMSO a partir das células 14. É importante que a extracção de DMSO ser realizado mais rapidamente que as células são particularmente sensíveis a morrer imediatamente após a descongelação. Se as células mais ou menos são requeridos para a descongelação, os volumes das soluções em ...

Cultura de células de cardiomiócitos é uma ferramenta crítica na pesquisa cardíaca moderna. Cardiomiócitos de ratos neonatais (NRCMs) são comumente utilizados uma vez que o isolamento e a cultura é mais fácil do que a de cardiomiócitos de rato adulto 1. O método NRCM ainda tem várias limitações, incluindo um procedimento de isolamento e a proliferação celular a longo limitada no prato. Existem numerosos protocolos para o isolamento de NRCMs com mais geralmente requerem 4-48 horas de trabalho 2-6. Além disso, as células são frequentemente isoladas a partir de 1 a filhotes de 2 dias de idade de ratos 2,4-7; o momento do nascimento pode ser imprevisível e conflito com outro trabalho no laboratório. Os isolamentos pode ser ineficiente e dispendiosa se apenas uma pequena quantidade de células são necessários para as experiências. A maioria dos esforços na melhoria do fluxo de trabalho o foco na redução do tempo de isolamento, mas isso não resolve os problemas de cronometrar o nascimento dos filhotes. Como alternativas, muitos laboratórios utilizamcardiomiócitos derivados de células-tronco embrionárias (CES) ou células-tronco pluripotentes induzidas (iPSCs). No entanto, o processo de reprogramação e / ou a diferenciação pode ser muito demorado e dispendioso, bem. Podem existir outros problemas quando se utiliza estas células como modelos in vitro de miócitos. Ambos ESC- e iPSC- cardiomiócitos derivados têm sido mostrados para apresentar diferenças de eletrofisiologia de cardiomiócitos primários 8-10. NRCMs dissociadas são capazes de serem armazenados durante vários dias, usando refrigeração 11, no entanto, esta não permite a armazenagem a longo prazo. O nitrogénio líquido é tipicamente usado para preservar as células para um período de tempo maior, mas requer um crioprotector tal como sulfóxido de dimetilo (DMSO). Pesquisas anteriores mostraram que a concentração ideal entre 5-10% DMSO na mídia congelamento permite a criopreservação de NRCMs, mas mesmo assim a viabilidade permanece baixa 12. Embora DMSO ajuda a proteger as células durante a livreXing, que pode ser tóxico para células em concentrações acima de 1,5% 13. Estudos anteriores têm demonstrado que a remoção de DMSO lentamente a partir das células, pode melhorar a viabilidade celular 14. Procurou-se melhorar a eficiência de ensaios baseados em células NRCM por criopreservação das células após o isolamento. Isto permite que as células a ser descongelado e utilizado quando necessário, reduzindo a frequência de isolamento e o consumo dos animais. Usando este método, que mostram que é possível criopreservar NRCMs e descongelar-los para uso numa altura posterior. Depois de descongelar as células manter uma viabilidade aceitável e produzir culturas NRCM que são positivas para sarcomérica α-actinina (α-SA) e contraem espontaneamente.

<table><tbody><tr><td>IMDM (+25 mM HEPES +L-glutamine)</td><td>Gibco</td><td>12440-046</td><td>With added 25 mM HEPES and L-glutamine</td></tr><tr><td>L-glutamine</td><td>Gibco</td><td>25030-081</td><td></td></tr><tr><td>FBS</td><td>Hyclone</td><td>SH30070.03</td><td></td></tr><tr><td>Gentamicin</td><td>Gibco</td><td>15710-064</td><td></td></tr><tr><td>2-Mercaptoethanol</td><td>Gibco</td><td>21985-023</td><td></td></tr><tr><td>HBSS (+Ca +Mg)</td><td>Corning</td><td>21-020-CV</td><td>With added calcium and magnesium, pH 7.1-7.4</td></tr><tr><td>Trypsin 0.25%</td><td>Gibco</td><td>25300-056</td><td></td></tr><tr><td>Trypsin 0.05%</td><td>Gibco</td><td>25300-054</td><td></td></tr><tr><td>Cryostor CS5</td><td>BioLife Solutions</td><td>205102</td><td>Freezing media</td></tr><tr><td>Cryogenic Vial</td><td>Corning</td><td>430659</td><td></td></tr><tr><td>Collagenase</td><td>Sigma</td><td>C1889-50MG</td><td></td></tr><tr><td>40 &amp;mu;m Cell Strainer</td><td>Greiner Bio-One</td><td>542040</td><td></td></tr><tr><td>Sterilizing Vacuum Filter (0.22&amp;mu;m)</td><td>Corning</td><td>431118</td><td></td></tr><tr><td>50 ml Conical</td><td>Corning</td><td>430828</td><td></td></tr><tr><td>15 ml Conical</td><td>Corning</td><td>430790</td><td></td></tr><tr><td>trypan blue</td><td>Cellgro</td><td>25-900-CI</td><td></td></tr><tr><td>Mr Frosty Freezing Container</td><td>ThermoScientific</td><td>5100-0001</td><td></td></tr><tr><td>Millicell EZ&amp;nbsp;SLIDES</td><td>Millipore</td><td>PEZGS0416</td><td></td></tr><tr><td>&amp;alpha;-sarcomeric actinin antibody</td><td>Sigma</td><td>A7811</td><td></td></tr><tr><td>Fibronectin</td><td>Corning</td><td>356008</td><td></td></tr><tr><td>Bromodeoxyuridine</td><td>BD Biosciences</td><td>51-7581KZ</td><td></td></tr></tbody></table>

isolation and cryopreservation of neonatal rat cardiomyocytes

Cell culture has become increasingly important in cardiac research, but due to the limited proliferation of cardiomyocytes, culturing cardiomyocytes is difficult and time consuming. The most commonly used cells are neonatal rat cardiomyocytes (NRCMs), which require isolation every time cells are needed. The birth of the rats can be unpredictable. Cryopreservation is proposed to allow for cells to be stored until needed, yet freezing/thawing methods for primary cardiomyocytes are challenging due to the sensitivity of the cells. Using the proper cryoprotectant, dimethyl sulfoxide (DMSO), cryopreservation was achieved. By slowly extracting the DMSO while thawing the cells, cultures were obtained with viable NRCMs. NRCM phenotype was verified using immunocytochemistry staining for &#945;-sarcomeric actinin. In addition, cells also showed spontaneous contraction after several days in culture. Cell viability after thawing was acceptable at 40-60%. In spite of this, the methods outlined allow one to easily cryopreserve and thaw NRCMs. This gives researchers a greater amount of flexibility in planning experiments as well as reducing the use of animals.

Seguindo o isolamento dos cardiomiócitos de ratos neonatais, as células são congeladas até azoto líquido, e pode ser armazenado durante pelo menos vários meses. Tipicamente, durante o descongelamento, a viabilidade determinada por análise de Azul de Tripano será entre 40-60%. Embora este seja mais baixa do que outros tipos de células, com a sementeira e a cultura adequado as células irão proliferar (Figura 1). A fim de verificar a contractilidade, as células podem ser visualizados utilizando...

Watch this Scientific Journal Video about Isolation and Cryopreservation of Neonatal Rat Cardiomyocytes at JoVE.com

Isolation and Cryopreservation of Neonatal Rat Cardiomyocytes

The isolation of neonatal rat cardiomyocytes is a time consuming and unpredictable procedure. This study describes methods for cryopreservation and thawing of neonatal rat cardiomyocytes that allows for more efficient use of cells. The thawed NRCMs can be used for various experiments without the need for performing isolations each time.

O isolamento e criopreservação de Neonatais Rato Cardiomyocytes

Cell culture has become increasingly important in cardiac research, but due to the limited proliferation of cardiomyocytes, culturing cardiomyocytes is ...

isolation-and-cryopreservation-of-neonatal-rat-cardiomyocytes

Research

JoVE Journal

Developmental Biology

12.5K visualizações.  College of Veterinary Medicine, North Carolina State University. The isolation of neonatal rat cardiomyocytes is a time consuming and unpredictable procedure. This study describes methods for cryopreservation and thawing of neonatal rat cardiomyocytes that allows for more efficient use of cells. The thawed NRCMs can be used for various experiments without the need for performing isolations each time.

Vídeo: Isolation and Cryopreservation of Neonatal Rat Cardiomyocytes

Isolation of Neural Stem/Progenitor Cells from the Periventricular Region of the Adult Rat and Human Spinal Cord

Adult rat and human spinal cord neural stem/progenitor cells (NSPCs) cultured in growth factor-enriched medium allows for the proliferation of multipotent, self-renewing, and expandable neural stem cells. In serum conditions, these multipotent NSPCs will differentiate, generating neurons, astrocytes, and oligodendrocytes. The harvested tissue is enzymatically dissociated in a papain-EDTA solution and then mechanically dissociated and separated through a discontinuous density gradient to yield a single cell suspension which is plated in neurobasal medium supplemented with epidermal growth factor (EGF), basic fibroblast growth factor (bFGF), and heparin. Adult rat spinal cord NSPCs are cultured as free-floating neurospheres and adult human spinal cord NSPCs are grown as adherent cultures. Under these conditions, adult spinal cord NSPCs proliferate, express markers of precursor cells, and can be continuously expanded upon passage. These cells can be studied in vitro in response to various stimuli, and exogenous factors may be used to promote lineage restriction to examine neural stem cell differentiation. Multipotent NSPCs or their progeny can also be transplanted into various animal models to assess regenerative repair.

The adult mammalian spinal cord contains neural stem/progenitor cells (NSPCs) that can be isolated and expanded in culture. This protocol describes the harvesting, isolation, culture, and passaging of NSPCs generated from the periventricular region of the adult spinal cord from the rat and from human organ transplant donors.

Isolamento de Neural Stem / células progenitoras da Região Periventricular do rato adulto e Medula Espinhal Humano

Adult rat and human spinal cord neural stem/progenitor cells (NSPCs) cultured in growth factor-enriched medium allows for the proliferation of ...

Biologia do Desenvolvimento

Isolation and Culture of Rat Embryonic Neural Cells: A Quick Protocol

We are describing a quick method to dissociate and culture hippocampal or cortical neurons from E15-17 rat embryos. The procedure can be applied successfully to the isolation of mouse and human primary neurons and neural progenitors. Dissociated neurons are maintained in serum-free medium up to several weeks. These cultures can be used for nucleofection, immunocytochemistry, nucleic acids preparation, as well as electrophysiology. Older neuronal cultures can also be transfected with a good efficiency rate by lentiviral transduction and, less efficiently, with calcium phosphate or lipid-based methods such as lipofectamine.

We describe a rapid methodology to isolate and culture hippocampal and cortical neurons from rodent embryos. This protocol allows us to perform experiments in which nearly pure neuronal cultures are required.

Isolamento e cultivo de células neurais embrionárias de ratos: um protocolo rápido

We are describing a quick method to dissociate and culture hippocampal or cortical neurons from E15-17 rat embryos. The procedure can be applied ...

Neurociência

Isolation and Cultivation of Adult Rat Cardiomyocytes

In an intact heart, adjacent cells influence adult cardiomyocytes. With the method of isolation and cultivation of adult cardiomyocytes, a precise investigation of the behavior of these cells under specific treatments and environments is possible. This manuscript presents a protocol for successful isolation and cultivation of adult rat ventricular cardiomyocytes (ARVC).
The rat is sacrificed by cervical dislocation under deep anesthesia. Then, the heart is extracted and the aorta is uncovered. Subsequently, perfusion on the Langendorff perfusion system with calcium depletion and collagenase treatment is performed. Afterwards, ventricular tissue gets minced, re-circulated, and filtered, followed by three centrifugation steps with gradual addition of CaCl2 until physiological calcium concentration is reached. ARVC are plated on cell culture dishes. After refreshing the cell culture medium, ARVC can be cultivated for up to six days without changing the serum-containing culture medium. Isolation of ARVC is a calcium sensitive process. Small changes in the intracellular calcium concentration cause a decrease in the quality and viability of the isolated cells.
Freshly isolated ARVC are rod shaped. Within the first days of cultivation they lose the rod-shaped morphology and form pseudopodia-like structures (spreading). During this morphological formation ARVC initially degrade their contractile elements followed by a reformation through actin stress fibers and de novo sarcomerogenesis. After one week of cultivation, most ARVC show a widespread appearance with a clearly detectable cross striation. This process is sensitive to intracellular calcium concentration, as treatment with ionomycin attenuates spreading. Key markers in this process of de- and re-differentiation are &#946;-myosin heavy chain (&#946;-MHC), oncostatin M (OSM), and swiprosin-1 (EFHD2). Recent studies have suggested that cardiac re- and de-differentiation occurring under culture conditions mimics features seen in vivo during cardiac remodeling. Therefore, isolation and cultivation of ARVC play a key role in understanding the biology of cardiomyocytes.

Here, we present a protocol for the isolation and cultivation of adult rat ventricular cardiomyocytes (ARVC). Isolated ARVC can be used for short and long-term cultivation. The isolation and cultivation of ARVC can play a key role in developing new treatment regimens for cardiac diseases.

Isolamento e cultivo de rato adulto Cardiomyocytes

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

Medicina

Isolation and Culture of Neonatal Mouse Cardiomyocytes

Cultured neonatal cardiomyocytes have long been used to study myofibrillogenesis and myofibrillar functions. Cultured cardiomyocytes allow for easy investigation and manipulation of biochemical pathways, and their effect on the biomechanical properties of spontaneously beating cardiomyocytes.	
The following 2-day protocol describes the isolation and culture of neonatal mouse cardiomyocytes. We show how to easily dissect hearts from neonates, dissociate the cardiac tissue and enrich cardiomyocytes from the cardiac cell-population. We discuss the usage of different enzyme mixes for cell-dissociation, and their effects on cell-viability. The isolated cardiomyocytes can be subsequently used for a variety of morphological, electrophysiological, biochemical, cell-biological or biomechanical assays. We optimized the protocol for robustness and reproducibility, by using only commercially available solutions and enzyme mixes that show little lot-to-lot variability. We also address common problems associated with the isolation and culture of cardiomyocytes, and offer a variety of options for the optimization of isolation and culture conditions.

Primary mouse cardiomyocyte cultures are one of the pivotal tools for the investigation of myofibrillar organization and function. The following protocol describes the isolation and culture of primary cardiomyocytes from neonatal mouse hearts. The resulting cardiomyocyte cultures may be subsequently used for a variety of biomechanical, biochemical and cell-biological assays.

Isolamento e Cultura de Neonatais rato Cardiomyocytes

Cultured neonatal cardiomyocytes have long been used to study  myofibrillogenesis and myofibrillar functions. Cultured cardiomyocytes allow  for easy ...

Biologia

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.

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.

Isolamento dos Cardiomyocytes Atrial de um modelo do rato de metabólicas relacionadas com síndrome de insuficiência cardíaca com fração de ejeção preservada

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

Um novo método de injeção lenta minimamente invasivo para reduzir a lesão tecidual

A Novel Cell Injection Method with Minimum Invasion

Directly injecting cells into tissues is a necessary process in cell administration and/or replacement therapy. The cell injection requires a sufficient amount of suspension solution to allow the cells to enter the tissue. The volume of the suspension solution affects the tissue, and this can cause major invasive injury as a result of the cell injection. This paper reports on a novel cell injection method, called slow injection, that aims to avoid this injury. However, pushing out the cells from the needle tip requires a sufficiently high injection speed according to Newton's law of shear force. To solve the above contradiction, a non-Newtonian fluid, such as gelatin solution, was used as the cell suspension solution in this work. Gelatins solution have temperature sensitivity, as their form changes from gel to sol at approximately 20 &#176;C. Therefore, to maintain the cell suspension solution in the gel form, the syringe was kept cooled in this protocol; however, once the solution was injected into the body, the body temperature converted it to a sol. The interstitial tissue fluid flow can absorb excess solution. In this work, the slow injection technique allowed cardiomyocyte balls to enter the host myocardium and engraft without surrounding fibrosis. This study employed a slow injection method to inject purified and ball-formed neonatal rat cardiomyocytes into a remote area of myocardial infarction in the adult rat heart. At 2 months following the injection, the hearts of the transplanted groups showed significantly improved contractile function. Furthermore, histological analyses of the slow-injected hearts revealed seamless connections between the host and graft cardiomyocytes via intercalated disks containing gap junction connections. This method could contribute to next-generation cell therapies, particularly in cardiac regenerative medicine.

Autor em destaque: um novo método de injeção de células com invasão mínima  

This method eliminates any major invasion during cell injections caused by the cell suspension solution.

Um novo método de injeção de células com invasão mínima

Directly injecting cells into tissues is a necessary process in cell administration and/or replacement therapy. The cell injection requires a sufficient ...

Bioengenharia

Live Cell Imaging of Primary Rat Neonatal Cardiomyocytes Following Adenoviral and Lentiviral Transduction Using Confocal Spinning Disk Microscopy

Primary rat neonatal cardiomyocytes are useful in basic in vitro cardiovascular research because they can be easily isolated in large numbers in a single procedure. Due to advances in microscope technology it is relatively easy to capture live cell images for the purpose of investigating cellular events in real time with minimal concern regarding phototoxicity to the cells. This protocol describes how to take live cell timelapse images of primary rat neonatal cardiomyocytes using a confocal spinning disk microscope following lentiviral and adenoviral transduction to modulate properties of the cell. The application of two different types of viruses makes it easier to achieve an appropriate transduction rate and expression levels for two different genes. Well focused live cell images can be obtained using the microscope&#8217;s autofocus system, which maintains stable focus for long time periods. Applying this method, the functions of exogenously engineered proteins expressed in cultured primary cells can be analyzed. Additionally, this system can be used to examine the functions of genes through the use of siRNAs as well as of chemical modulators.

This protocol describes a method of live cell imaging using primary rat neonatal cardiomyocytes following lentiviral and adenoviral transduction using confocal spinning disk microscopy. This enables detailed observations of cellular processes in living cardiomyocytes.

Imagens de células vivas de primários de ratos neonatos Cardiomyocytes Após Adenoviral e Transdução Lentivirus Usando confocal Spinning Disk Microscopia

Primary rat neonatal cardiomyocytes are useful in basic in vitro cardiovascular research because they can be easily isolated in large numbers in a single ...

A Simple and Effective Method to Consistently Isolate Mouse Cardiomyocytes

The need for reproducible yet technically simple methods yielding high-quality cardiomyocytes is essential for research in cardiac biology. Cellular and molecular functional experiments (e.g., contraction, electrophysiology, calcium cycling, etc.) on cardiomyocytes are the gold standard for establishing mechanism(s) of disease. The mouse is the species of choice for functional experiments and the described technique is specifically for the isolation of mouse cardiomyocytes. Previous methods requiring a Langendorff apparatus require high levels of training and precision for aortic cannulation, often resulting in ischemia. The field is shifting toward Langendorff-free isolation methods that are simple, are reproducible, and yield viable myocytes for physiological data acquisition and culture. These methods greatly diminish ischemia time compared to aortic cannulation and result in reliably obtained cardiomyocytes. Our adaptation to the Langendorff-free method includes an initial perfusion with ice-cold clearing solution, use of a stabilizing platform that ensures a steady needle during perfusion, and additional digestion steps to ensure reliably obtained cardiomyocytes for use in functional measurements and culture. This method is simple and quick to perform and requires little technical skill.

The gold standard in cardiology for cellular and molecular functional experiments are cardiomyocytes. This article describes adaptations to the non-Langendorff technique to isolate mouse cardiomyocytes.

Um Método Simples e Eficaz para Isolar Consistentemente Cardiomiócitos de Camundongos

The need for reproducible yet technically simple methods yielding high-quality cardiomyocytes is essential for research in cardiac biology. Cellular and ...

O isolamento e criopreservação de Neonatais Rato Cardiomyocytes

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