Name: isolation of human myoblasts, assessment of myogenic differentiation, and store-operated calcium entry measurement
Uploaded: 2017-07-26T12:30:00
Description: Watch this Scientific Journal Video about Isolation of Human Myoblasts, Assessment of Myogenic Differentiation, and Store-operated Calcium Entry Measurement at JoVE.com

Este trabalho foi apoiado pela Fundação Nacional de Ciência da Suíça (número de subvenção 310030-166313), a &quot;Fundação Suisse para a pesquisa sobre les maladies musculaires&quot;, a &quot;Fundação Marcel Levaillant&quot; e a &quot;Fundação para a pesquisa ostéo-articular&quot;.

As amostras musculares humanas (tecidos obtidos a partir de músculos semitendinosos) foram coletadas durante a cirurgia ortopédica em pacientes saudáveis ​​como resíduos cirúrgicos. Todos os métodos relacionados ao estudo humano foram realizados de acordo com as diretrizes e regulamentos das Autoridades Regulatórias de Saúde da Suíça e aprovados pela Comissão Cantonale d&#39;Ethique de Recherche dos Governos Cantonais de Genebra, Suíça (protocolo CER n ° 12-259) . Foram obtidos consentimentos informado...

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O isolamento e a cultura dos mioblastos humanos do músculo esquelético adulto oferecem um modelo in vitro para estudar a diferenciação muscular e a regeneração muscular. Neste artigo, fornecemos um protocolo que permite a purificação de altos rendimentos de mioblastos humanos de maneira simples e limitada em termos de custo. Além disso, esta técnica fornece resultados confiáveis ​​e reprodutíveis em termos de porcentagem de mioblastos isolados e sua eficiência d...

Os músculos esqueletais humanos são compostos de grupos de fibras musculares contrácteis e multinucleadas resultantes da fusão de células precursoras miogênicas. Os músculos esqueléticos têm a capacidade de regenerar após lesão graças à presença de SCs, as células estaminais do músculo esquelético localizadas entre a membrana plasmática das miofibras (sarcolemma) e a lâmina basal. Em músculos não feridos, os SCs estão principalmente presentes em um estado quiescente. Em resposta ao estresse ou lesão mecânica, os SCs se tornam ativados (mioblastos), proliferam e sofrem qualquer diferenciação para formar novas miofibras ou auto-renovação para reabastecer o SC pool 1 , 2 . Ao longo dos anos, várias técnicas foram desenvolvidas para isolar SCs e sua progênie, os mioblastos, a partir de biópsias de músculo esquelético. Com a maior compreensão dos marcadores de superfície celular expressados ​​nessas células e a metodologia de triagem celular ativada por fluorescência (FACS) 3, 4 , 5 , agora é possível isolar populações puras de mioblastos humanos a partir de amostras musculares. A sinalização de cálcio rege o desenvolvimento do músculo esquelético, a homeostase e a regeneração. Em particular, a entrada Ca 2+ que é ativada após a depleção da loja intracelular, chamada SOCE, é de grande importância 6 para esses processos. Após a estimulação celular, o nível de Ca 2 + no retículo endo / sarcoplasmático (ER / SR) diminui, o que, por sua vez, ativa os canais de Ca 2+ da membrana plasmática que permitem a entrada de Ca 2+ para reabastecer o ER / SR 7 . As duas principais proteínas envolvidas em SOCE são a proteína 1 (STIM1) da molécula de interação estromal sensível ao ER / SR Ca 2 + e o canal Ca 2+ da membrana plasmática Orai1. O músculo esquelético expressa abundantemente essas duas proteínas, bem como outras proteínas das mesmas famílias (STIM2 aNd Orai2-Orai3) 8 , 9 e vários canais permeáveis ​​a Ca 2+ da família canônica potencial de receptor transitório (TRPC) 10 , 11 , 12 , 13 . A entrada de Ca 2+ através da via SOCE é de grande importância para a formação / regeneração muscular 14 . As mutações das proteínas STIM1 ou Orai1 têm efeitos deletérios sobre a função muscular, levando principalmente a hipotonia muscular 15 . Modelos de animais com deficiência de SOCE também apresentam massa muscular reduzida e força, juntamente com uma fatigabilidade melhorada 6 , 16 , 17 . Como mencionado, outras proteínas STIM e Orai, bem como muitos canais TRPC, são expressas no músculo esquelético, e seus respectivos papéis não foram determinados até agora. Ao bater dPossuem seu nível de expressão, é possível investigar suas implicações na SOCE e seus papéis durante a diferenciação muscular do esqueleto humano. A medição de SOCE pode ser realizada usando duas abordagens diferentes: gravações eletrofisiológicas atuais e medições de Ca 2+ . A eletrofisiologia é certamente um método mais direto, pois mede a atualidade de interesse e sua assinatura eletrofisiológica associada. No entanto, esta técnica é muito difícil de aplicar às células musculares, principalmente devido ao grande tamanho das células musculares e ao pequeno tamanho da corrente endógena da SOCE. A imagem citosólica do Ca 2 + é tecnicamente muito acessível, mas a medida é mais indireta, pois o nível de Ca 2+ medido no citosol reflete tanto a entrada de Ca 2 + quanto o re-bombeamento da célula ou nas lojas internas. Uma metodologia que inclui a isolação de mioblastos de pequenos pedaços de skel humanoO músculo etal após digestão enzimática, amplificação e FACS é explicado neste artigo. O processo de diferenciação muscular e o protocolo de imunofluorescência para seguir a expressão de marcadores de diferenciação ao longo do tempo são descritos 18 . Finalmente, são explicadas as medidas de SOCE e o papel de diferentes canais de íons na sinalização de Ca 2 + e diferenciação muscular esquelética.

<table border="0" cellpadding="0" cellspacing="0" width="944">
	<tbody>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Ham&#8217;s F10</td>
			<td style="width:235px;">ThermoFisher Scientific</td>
			<td style="width:187px;">31550-023</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">FCS</td>
			<td style="width:235px;">ThermoFisher Scientific</td>
			<td style="width:187px;">10270-106</td>
			<td style="width:201px;">Lot 41G5532K</td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">BSA</td>
			<td style="width:235px;">Sigma</td>
			<td style="width:187px;">O5482</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">fetuin</td>
			<td style="width:235px;">Sigma</td>
			<td style="width:187px;">F3385</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">EGF</td>
			<td style="width:235px;">Corning</td>
			<td style="width:187px;">354001</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Dexamethansone</td>
			<td style="width:235px;">Sigma</td>
			<td style="width:187px;">D1756</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Insulin</td>
			<td style="width:235px;">Sigma</td>
			<td style="width:187px;">I9278</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Creatine</td>
			<td style="width:235px;">Sigma</td>
			<td style="width:187px;">27900</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Pyruvate</td>
			<td style="width:235px;">Sigma</td>
			<td style="width:187px;">P4562</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Uridine</td>
			<td style="width:235px;">Sigma</td>
			<td style="width:187px;">U3003</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Gentamycin</td>
			<td style="width:235px;">ThermoFisher Scientific</td>
			<td style="width:187px;">15710-049</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Trypsin-EDTA 0.05%</td>
			<td style="width:235px;">ThermoFisher Scientific</td>
			<td style="width:187px;">25300-062</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">70 &#956;m cell strainer</td>
			<td style="width:235px;">Falcon</td>
			<td style="width:187px;">352350</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">40 &#956;m cell strainer</td>
			<td style="width:235px;">Falcon</td>
			<td style="width:187px;">352340</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Falcon 50&#160;ml tube</td>
			<td style="width:235px;">Falcon</td>
			<td style="width:187px;">352070</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Falcon 15&#160;ml tube</td>
			<td style="width:235px;">Falcon</td>
			<td style="width:187px;">352096</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Falcon 5&#160;ml tube (FACS)</td>
			<td style="width:235px;">Falcon</td>
			<td style="width:187px;">352058</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Culture medium: OPTI-MEM</td>
			<td style="width:235px;">ThermoFisher Scientific</td>
			<td style="width:187px;">31985-047</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Transfectant reagnt: RNAiMax</td>
			<td style="width:235px;">ThermoFisher Scientific</td>
			<td style="width:187px;">1756064</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">PBS</td>
			<td style="width:235px;">ThermoFisher Scientific</td>
			<td style="width:187px;">14190-094</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Mounting medium</td>
			<td style="width:235px;">Fluka</td>
			<td style="width:187px;">10981</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Mouse anti-MyHC *</td>
			<td style="width:235px;">DSHB</td>
			<td style="width:187px;">MF20&#160;</td>
			<td style="width:201px;">concentrate</td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Mouse anti-myogenin</td>
			<td style="width:235px;">BD Pharmigen</td>
			<td style="width:187px;">556358</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Rabbit anti-MEF2</td>
			<td style="width:235px;">Santa Cruz Biotech</td>
			<td style="width:187px;">C-21</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Goat anti-mouse Alexa488</td>
			<td style="width:235px;">ThermoFisher Scientific</td>
			<td style="width:187px;">A11029</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Goat anti-rabbit Alexa 546</td>
			<td style="width:235px;">ThermoFisher Scientific</td>
			<td style="width:187px;">A11035</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Mouse anti human CD56-Alexa488</td>
			<td style="width:235px;">BD Pharmingen</td>
			<td style="width:187px;">557699</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Mouse anti human CD146-PECy7</td>
			<td style="width:235px;">BD Pharmingen</td>
			<td style="width:187px;">562135</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Mouse anti human CD45-PE-CF594</td>
			<td style="width:235px;">BD Pharmingen</td>
			<td style="width:187px;">562279</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Mouse anti human CD34-APC</td>
			<td style="width:235px;">BD Pharmingen</td>
			<td style="width:187px;">345804</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Mouse anti human CD144-PE</td>
			<td style="width:235px;">BD Pharmingen</td>
			<td style="width:187px;">560410</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Alexa Fluor 488 mouse IgG1k</td>
			<td style="width:235px;">BD Pharmingen</td>
			<td style="width:187px;">557702</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">PECy7 mouse IgG1k</td>
			<td style="width:235px;">BD Pharmingen</td>
			<td style="width:187px;">557872</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">PE-CF594 mouse IgG1k</td>
			<td style="width:235px;">BD Pharmingen</td>
			<td style="width:187px;">562292</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">APC mouse IgG1k</td>
			<td style="width:235px;">BD Pharmingen</td>
			<td style="width:187px;">550854</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">PE mouse IgG1k</td>
			<td style="width:235px;">BD Pharmingen</td>
			<td style="width:187px;">556650</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="49">
			<td height="49" style="height:49px;width:321px;">DAPI</td>
			<td style="width:235px;">Sigma</td>
			<td style="width:187px;">D9542</td>
			<td style="width:201px;">CAUTION:&#160; toxic compound</td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Paraformaldehyde</td>
			<td style="width:235px;">Fluka</td>
			<td style="width:187px;">762400</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Fura-2 AM</td>
			<td style="width:235px;">ThermoFisher Scientific</td>
			<td style="width:187px;">F1201</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="25">
			<td height="25" style="height:25px;width:321px;">Pluronic F-127</td>
			<td style="width:235px;">ThermoFisher Scientific</td>
			<td style="width:187px;">P3000MP</td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="49">
			<td height="49" style="height:49px;width:321px;">Thapsigargin</td>
			<td style="width:235px;">Sigma</td>
			<td style="width:187px;">T9033</td>
			<td style="width:201px;">CAUTION&#160;: toxic compound&#160;</td>
		</tr>
		<tr height="49">
			<td height="49" style="height:49px;width:321px;">Ratio imaging acquisition software: Metafluor 6.3</td>
			<td style="width:235px;">Molecular Device</td>
			<td style="width:187px;"></td>
			<td style="width:201px;"></td>
		</tr>
		<tr height="24">
			<td colspan="2" height="24" style="height:24px;">*&#160;: MF 20 was deposited to the DSHB by Fischman, D.A.&#160;</td>
			<td></td>
			<td></td>
		</tr>
	</tbody>
</table>

isolation of human myoblasts, assessment of myogenic differentiation, and store-operated calcium entry measurement

As células satélites (SC) são células-tronco muscular localizadas entre a membrana plasmática das fibras musculares e a lâmina basal circundante. São essenciais para a regeneração muscular. Após lesão, que ocorre freqüentemente nos músculos esqueléticos, os SCs são ativados. Eles proliferam como mioblastos e se diferenciam para reparar lesões musculares. Entre muitos eventos que ocorrem durante a diferenciação muscular, os sinais citostáticos de Ca 2 + são de grande importância. Estes sinais de Ca2 + surgir de libertação de Ca2 + a partir de Ca 2+ lojas internos, bem como de Ca2 + entrada a partir do espaço extracelular, particularmente a entrada de Ca2 + operado por armazenamento (SOCE). Este artigo descreve uma metodologia utilizada para obter uma população pura de mioblastos humanos a partir de amostras musculares coletadas após a cirurgia ortopédica. O tecido é digerido mecanicamente e enzimaticamente, e as células são amplificadas e depois ordenadas por citometria de fluxo de acordo com a presença de especificaçãoMarcadores de membrana de fic. Uma vez obtidos, os mioblastos humanos são expandidos e comprometidos em se diferenciar removendo os fatores de crescimento do meio de cultura. Os níveis de expressão de fatores de transcrição específicos e imunofluorescência in vitro são utilizados para avaliar o processo de diferenciação miogênica em condições de controle e após o silenciamento de proteínas envolvidas na sinalização de Ca 2+ . Finalmente, detalhamos o uso de Fura-2 como uma sonda ratiométrica de Ca 2+ que fornece medidas confiáveis ​​e reprodutíveis de SOCE.

Após a dissociação enzimática de uma amostra de músculo humano, as células foram amplificadas em GM. Os mioblastos humanos, definidos como células CD56 + / CD146 + / CD45- / CD34- / CD144-, foram obtidos após FACS. Os mioblastos representaram mais de 60% da população analisada ( Figura 1 ). Os mioblastos humanos primários foram reaparecidos, cultivados em confluência e cultivados em DM por 48 h. Após a imunocoloração para a expressão do fator de transcrição MEF2 e da prote...

Watch this Scientific Journal Video about Isolation of Human Myoblasts, Assessment of Myogenic Differentiation, and Store-operated Calcium Entry Measurement at JoVE.com

Isolation of Human Myoblasts, Assessment of Myogenic Differentiation, and Store-operated Calcium Entry Measurement

Aqui, descrevemos uma metodologia para obter uma população pura de mioblastos humanos a partir do tecido muscular adulto. Essas células são usadas para estudar a diferenciação do músculo esquelético in vitro e, em particular, para estudar proteínas envolvidas na sinalização de Ca 2+ .

Isolamento de mioblastos humanos, avaliação da diferenciação miogênica e medição de entrada de cálcio armazenada

Satellite cells (SC) are muscle stem cells located between the plasma membrane of muscle fibers and the surrounding basal lamina. They are essential for ...

The overall goal of this procedure is to obtain a pure population of human myoblasts from adult skeletal muscle. These cells are used for functional studies such as assessment of myogenic differentiation and measurement of store-operated calcium entry. The main advantage of this technique is that it allows a rapid, simple and reproducible isolation of human primary myoblasts.These myoblasts are the new ex-vivo to study the calcium signaling during muscle regeneration. This method can help answer key questions in the muscle field such as, identifying the ionic channels and the transcription factors involved during muscle differentiation. For this method can provide insight into gene functions during human myogenic differentiation.It can also be applied to other studies such as, potential for using myogenic stem cells to treat muscular dystrophies. Transfer the muscle sample into a sterile six centimeter plate, wash the sample with PBS twice. Remove any remaining adipose tissue and weigh the sample.Next, add trypsin and mince the muscle into pieces smaller than two millimeters in size. Once minced, use a 10 milliliter pipette to transfer the tissue into a 200 milliliter dissociation bottle containing a stir bar, then continue collecting minced tissue in trypsin solution until the dissociation bottle is filled to 90 milliliters. Now, incubate the tissue in a water bath at 37 degrees celsius for 60 minutes with gentle stirring.After an hour, add 10 milliliters of FCS to stop the reaction and homogenize the mixture using trituration. Now, load 70 micron strainers onto two 50 milliliter tubes and pass half of the cell suspension through each strainer by pipetting the suspension into the filters. Next, make a suspension of the cells in growth medium and plate 200, 000 cells onto six centimeter plates with four milliliters of medium.Incubate the plates, changing the medium every third day. After five to seven days, the cells should be 70%to 80%confluent, then, stain them. To begin, rinse the plate of confluent cells with PBS.Then, add one milliliter of trypsin solution and let the enzyme work for three minutes. Stop the reaction by adding two milliliters of medium and collect the cells in a 15 milliliter tube. Then, spin the cells down and re-suspend them in one milliliter of medium.Next, take a cell count while storing the cells on ice. For the facts analysis, load seven tubes with 100, 000 cells each. Load the remaining cells into an eighth tube for sorting.Wash the cells with one milliliter of cold fax buffer, then, centrifuge the tubes and aspirate and discard the supernatant. Add back 200 microliters of fax buffer with the appropriate antibodies and let the cells incubate on ice for 30 minutes. After 30 minutes, wash the cells again and re-suspend them in 500 microliters of fax buffer, then sort the cells using a flow cytometer.After excluding the CD45 positive hematopoietic cells, separate the CD45 negative cells based on CD56 expression. Then, gate the CD56 positive population for CD34, CD144 and CD146. Re-analyse a fraction of the sorted population, to check the purity.Now, pull the human myoblasts and wash them with five milliliters of medium. Then re-suspend them in one milliliter of medium. Transfer the suspension to a six centimeter plate with four milliliters of medium and incubate the plate at 37 degrees celsius with 7%carbon dioxide.For this procedure, have cultured myoblasts and make fresh transvection medium. Incubate the medium at room temperature for 15 to 20 minutes. During the medium incubation, prepare the myoblasts.First, rinse them once with PBS. Then, trypsinise the adherent cells. Stop the reaction by adding two milliliters of medium.Then, collection the cells into a 50 milliliter tube. Spin them down and re-suspend them in one milliliter of medium. For each transvection, prepare 500, 000 cells in 200 microliters of medium.To each 500 microliters of transvection medium, add a 200 microliter aliquot of cells and then mix using only two strokes of the pipette gun. Then, let the reactions proceed for five minutes at room temperature. After five minutes, transfer the reactions to 3.5 centimeter culture dishes, each containing one glass cover slip.Next, add 1.3 milliliters of medium for a final volume of two milliliters and incubate the dishes. After 48 hours of differentiation, the cells can be immunostained or analyzed using calcium imaging. For either option, first carefully wash the cells twice using one milliliter of room temperature PBS to wash.Try to avoid detaching the myotubes. For a calcium imaging, cover the washed cells with two micromolar fura-2 AM plus one micromolar threonic acid in calcium containing medium. Then, let them incubate for about 30 minutes before mixing.Next, wash the cells twice with unmodified calcium containing medium and then, incubate them for 10 to 15 minutes for the esterification. Now, remove the cover slip from a culture plate and install it into the experimental chamber. Load the chamber with calcium containing medium, place it under a microscope, then, start the data recording.Fura-2 is excited alternately at 340 and 380 nanometers. The emission light is collected at 510 nanometers. Diving the 340 nanometer nanometer images by the 380 images, provides the image ratios as the fluctuations and calcium concentration are relatively low, acquire one image ratio every two seconds.After two or three minutes, replace the medium with calcium free medium. Then, for one or two minutes, monitor the activity of the store operated calcium in the cells. Next, add one micromolar thapsigargin to the cells to deplete their internal calcium stores.Wait eight to 10 minutes, then, rapidly replace the medium with the calcium containing medium and record for five minutes while calcium enters the cells via the suc e channels. After terminating the experiment, analyze the images. Select an area where there are no cells for region one, which defines the background, then, select an area in the cytoplasm for region two.The two regions can be drawn on any of the images in the series. Next, go to the run experiments tab and select reference images for the 340 and 380 channels, select region one, then click on subtract background. Now, run the entire experiment to remove the background from all the images.Once completed, click log data option to open a spreadsheet in which the time and the ratio data are logged. Muscle cells were grown up, expanded and sorted using fax. Myoblasts represented more than 60%of the analyzed population.The primary human myoblasts were then cultured in differentiation medium and immunostained for the transcription factor of MEF2 and myosin heavy chain proteins. A majority of cells expressed myosin heavy chain and formed myotubes with fusion index values of about 60%the other 40%of the cells remained undifferentiated mononucleated cells, also known as reserve cells. The described store operated calcium entry experiment were successfully performed on the differentiated cells.Performing the same experiment to on cells transvected with small interfering RNA, directed against calcium permeable channels of the TRPC family, shows that the knockdown had a measurable impact on store operated calcium entry. After watching this video, you should have a good understanding of how to isolate human myoblasts from adult skeletal muscle. We use these cells to study the successive steps of muscle differentiation and in particular, deactivation of the transcription factors and calcium channels.Once mastered, this technique can be done in less than three hours if it is performed properly. It is a rapid, simple, reproducible method that obtains the yield of human myoblasts. While attempting this procedure, it is important to prevent the myoblast cultures from reaching full confidence, as there will be unwanted spontaneous differentiation.

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