Name: live cell imaging of primary rat neonatal cardiomyocytes following adenoviral and lentiviral transduction using confocal spinning disk microscopy
Uploaded: 2014-06-24T14:00:00.000+00:00
Duration: 13 min 36 s
Description: Watch this Scientific Journal Video about Live Cell Imaging of Primary Rat Neonatal Cardiomyocytes Following Adenoviral and Lentiviral Transduction Using Confocal Spinning Disk Microscopy at JoVE.com

We would like to thank Dr. Alengo Nyamay'antu and Dr. Ilse Timmerman for their advices about lentiviral packaging. This work is supported by an American Heart Association Scientist Development Grant 10SDG4170137.

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The authors have nothing to disclose.

Neonatal sıçan izole edilmiş primer kardiyomiyositlerde uzun in vitro kardiyomiyosit fonksiyonlarını incelemek için kullanılmıştır. Bu protokol, ilk olarak 4 ° C&#39;de tripsin O / N ile sindirerek ve daha sonra saflaştırılmış kolajenaz, iki aşamalı bir enzim sindirimi yöntemi kullanılarak sıçan yavrularından neonatal kardiyomiyositlerde izolasyonu için bir yöntem tarif eder. Saflaştırılmış kolajenaz adımı kullanarak bir avantajı enzim aynı sınıf tüm izolasyon için kullanı...

İlköğretim sıçan yenidoğan kardiyomiyositler uzun vitro 1 kardiyomyosit fonksiyonlarını araştırmak için kullanılmıştır. Onlar birkaç iyi kurulmuş yöntemlerle 2-4 sıçan yavrular izole etmek kolaydır. En yaygın yöntem kolajenazı önce veya hücre izolasyonu için kalbin bağ dokusu sindirmek için tripsin kullanır. Araştırmacılar ayrıca yetişkin kemirgenler 5-8 yanı sıra yenidoğan farelerin 9,10 dan kardiyomiyositlerin izole etmek için yöntemler geliştirmişlerdir. Bu protokol, iki aşamalı bir prosedür kullanılarak enzim sindirimi, neonatal sıçan yavrularından kardiyomiyositlerde izole edilmesi için bir yöntem tarif eder. Tripsin ilk 4 ° C &#39;de O / N el ve 37 ° C sıcaklıkta ve sonra saf bir kolajenaz 4 ° C&#39;de tripsin O / N, kalp dokusu inkübasyonu sıcak bir enzim solüsyonu 2 ardışık inkübasyonlar kullanan yöntemleri ile karşılaştırıldığında hücre hasat için gerekli adımları azaltır. Buna ek olarak, saflaştırılmış co kullanarakllagenase daha basit bir enzimlere göre, çok partiye değişkenlik dolayısıyla daha tekrarlanabilirlik sağlayan, elimine edilebilir. , Belirli bir proteinin fonksiyonel çalışmalar, genellikle bir adenovirüs 11-13 ve / veya 14-16 lentivirüs kullanarak bir protein ifade sistemi kullanır. [Uyarıcı not] viral üretim ve manipülasyon NIH talimatlarına göre yapılmalıdır. Adenovirüs konakçı genomu içine entegre değildir. Bu bölünen hücreler ve bölünmeyen hücreleri de dahil olmak üzere pek çok hücre tipi, hem birincil hücre ve hücre serileri de transdüksiyon çok yüksek bir etkinliğe sahiptir. Bu, adenovirüs gen ifadesi için güvenilir bir vektör sağlar. Adenovirüs vektörü tarafından kodlanan proteinin yüksek seviyeleri transdüksiyonu takip eden 48 saat içinde gelişir ve bunlar birkaç hafta 17 sürebilir. Bununla birlikte, protein ekspresyonu için bir adenovirüs kullanımının bir dezavantajı olduğu bir yeniden birleştirici ade geliştirilmesiAdenovirüs karmaşık ve zaman alıcı hem de. Birçok araştırmacı rekombinant gen ifadesi için Lentivirüslerden dönüm edilmiştir neden bu dezavantajı kısmen açıklıyor. Adenoviral yapıları aksine, bir lentiviral yapı üreten hızlı ve kolaydır. Lentivirüsler genellikle her iki bölme ve bölünmeyen hücrelere adenovirüs daha düşük transdüksiyon verimliliği, sahip olmakla birlikte, bunlar bir konakçı genom içine entegre yok. Sonuç olarak, kalıt aktarılan genin ifadesi için adenovirüsler daha lentivirüsler daha kararlıdır. Nedeniyle mikroskopi alanındaki teknolojik gelişmeler, bu rekombinant proteinleri ifade eden hücrelerin, canlı hücre görüntülerini yakalamak için çok daha kolaydır. Bu bile edinimi video oranı hızlarda geçerlidir. Bu durum araştırmacı ilgilenilen proteinin, özellikle işlevsel değişiklikler, gerçek zamanlı olarak etki hücreyi belirlemek için izin verir. Konfokal dönen disk mikroskop o liv için optimal bir tekniktir yapmak birçok önemli özelliklere sahiptirE hücre görüntüleme 18,19. Aynı anda nokta tarama konfokal mikroskoplar çok daha az lazer güç kullanırken Yokogawa eğirme disk, çok daha hızlı görüntü elde etmek için izin verir. Bu özelliklerin her ikisi de lazer örnekler aynı zamanda geçtiği çok sayıda eş odaklı delik içeren dönen bir disk, kaynaklanmaktadır. Satın alma sırasında disk kendisini hızla ve sürekli olarak 18-20 spin. Mikroskop otofokus sistemi kullanarak, istikrarlı odak uzun süreler boyunca devam edilir. Bu araştırmacılar, iyi odaklanmış canlı hücre görüntü almasına izin veriyor. Edinsel Görüntülerin bir film dosyası olarak oynatılır. Görüntüleri, ImageJ 21,22, FIJI 23 ya da başka ticari olarak temin edilebilen yazılımı gibi görüntü analizi yazılımı kullanılarak analiz edilmiştir.

<table><tbody><tr><td>1 Scissors for decapitation</td><td>WPI</td><td>501749</td><td>Autoclave before use</td></tr><tr><td>1 Fine scissors for heart isolation and chopping</td><td>WPI</td><td>14393</td><td>Autoclave before use</td></tr><tr><td>2 Fine forceps (Dumont No. 5)</td><td>Sigma</td><td>F6521</td><td>Autoclave before use</td></tr><tr><td>3 Sterilized 10 cm plastic dishes</td><td>Sigma</td><td>CLS430165</td><td>For heart isolation</td></tr><tr><td>3.5 cm Glass bottom culture dishes</td><td>MatTek</td><td>P35G-1.5-20-C</td><td>For final plating of cardiomyocytes for future live cell imaging. Micro-Dishes from ibidi are an acceptable alternative.</td></tr><tr><td>3.5 cm Glass bottom culture dishes</td><td>MatTek</td><td>P35G-0.17-14-C</td><td>For TIRF or high resolution image</td></tr><tr><td>Ethanol solution, 70% (v/v) in water</td><td>Sigma</td><td>E7148</td><td></td></tr><tr><td>2% Gelatin</td><td>Sigma</td><td>G1393</td><td></td></tr><tr><td>1 Sterilized 10 cm plastic dish</td><td>Sigma</td><td>CLS430165</td><td>For trypsinization</td></tr><tr><td>Aluminium foil</td><td>Any brand</td><td></td><td></td></tr><tr><td>Parafilm</td><td>Sigma</td><td>P7543</td><td></td></tr><tr><td>Two 10 cm plastic cell culture dish</td><td>Sigma</td><td>CLS430165</td><td>For selection</td></tr><tr><td>Autopipette</td><td>Drummond Scientific</td><td>4-000-300</td><td>For trituration</td></tr><tr><td>Cell counter</td><td></td><td></td><td></td></tr><tr><td>Cellometer, automated cell counter</td><td>nexcelom</td><td></td><td>To check and count cells</td></tr><tr><td>Microscope and hematocytometer</td><td>Any brand</td><td></td><td>To check and count cells</td></tr><tr><td>Trypan blue solution, 0.4%</td><td>invitrogen</td><td>15250-061</td><td></td></tr><tr><td>CO&lt;sub&gt;2&lt;/sub&gt; incubator</td><td>Sanyo</td><td>MCO-19AIC</td><td></td></tr><tr><td>Incubating orbital shaker</td><td>Sigma</td><td>Z673129</td><td>To shake heart tissue with collagenase at 37 &amp;deg;C at 170-200 rpm</td></tr><tr><td>10 mg/ml BrdU solution</td><td>BD Pharmingen</td><td>550891</td><td></td></tr><tr><td>DMEM, high glucose</td><td>invitrogen</td><td>41965039</td><td>Mix medium as indicated in the protocol and warm before use</td></tr><tr><td>MEM</td><td>invitrogen</td><td>31095029</td><td>Mix medium as indicated in the protocol and warm before use</td></tr><tr><td>Fetal bovine serum</td><td>invitrogen</td><td>26140079</td><td></td></tr><tr><td>Penicillin-streptomycin (10,000 U/ml)&amp;nbsp;</td><td>invitrogen</td><td>15140-122</td><td></td></tr><tr><td>Section 2 Lentiviral transduction</td><td></td><td></td><td></td></tr><tr><td>3 Packaging plasmids</td><td></td><td></td><td></td></tr><tr><td>pMDLg/pRRE</td><td>Addgene</td><td>12251</td><td></td></tr><tr><td>pRSV-Rev</td><td>Addgene</td><td>12253</td><td></td></tr><tr><td>pMD2.G</td><td>Addgene</td><td>12259</td><td></td></tr><tr><td>The lentiviral transfer vector, pLVX-IRES-Puro</td><td>Clontech</td><td>632183</td><td></td></tr><tr><td>Opti-MEM (serum-free medium)</td><td>invitrogen</td><td>31985070</td><td></td></tr><tr><td>Transfection reagent</td><td></td><td></td><td></td></tr><tr><td>polyethyleneimine&amp;ldquo;Max&amp;rdquo;, (MW 40,000) - High Potency Linear PEI (Equivalent to Mw 25,000 in Free Base Form)&amp;nbsp;</td><td>Polysciences</td><td>24765-2</td><td>It can be substituted with X-tremeGENE 9 from Roche</td></tr><tr><td>X-tremeGENE 9</td><td>Roche</td><td>6365779001</td><td>substitute for PEI as transfection reagent</td></tr><tr><td>Chloroquine</td><td>Sigma</td><td>C6628</td><td>Dissolve in water and make 100 mM stock solution. Inhibition of endosomal acidification can be achieved with 10-100 &amp;mu;M Chloroquine.</td></tr><tr><td>HEPES</td><td>Sigma</td><td>H3375</td><td></td></tr><tr><td>10 ml Luer-Lok syringe, sterilized</td><td>BD</td><td>309604</td><td></td></tr><tr><td>0.45 &amp;mu;m filters</td><td>Sigma</td><td>F8677</td><td>Use only cellulose acetate or polyethersulfone (PES) (low protein binding) filters. Do not use nitrocellulose filters. Nitrocellulose binds surface proteins on the lentiviral envelope and destroys the virus.</td></tr><tr><td>Hexadimethrine bromide</td><td>Sigma</td><td>H9268</td><td>Dissolve in water and make 8 mg/ml stock solution, then filter it to sterilize.</td></tr><tr><td>Polyethylene glycol 6,000</td><td>Sigma</td><td>81260</td><td></td></tr><tr><td>Sodium chloride</td><td>Sigma</td><td>S9888</td><td></td></tr><tr><td>Sodium hydroxide</td><td>Sigma</td><td>S5881</td><td></td></tr><tr><td>Section 3 Adenoviral transduction</td><td></td><td></td><td></td></tr><tr><td>HEK 293T cells</td><td>ATCC</td><td>CRL-11268</td><td></td></tr><tr><td>Some 10 cm cell culture dishes</td><td>Sigma</td><td>CLS430165</td><td></td></tr><tr><td>96-Well microplate with lid, flat-bottom, tissue culture, sterile</td><td>BD Falcon</td><td>353072</td><td>For titration</td></tr><tr><td>Multichannel pipette, 10-100 &amp;mu;l, 8-channel</td><td>eppendorf</td><td>3122 000.035</td><td></td></tr><tr><td>Section 4 Live cell imaging</td><td></td><td></td><td></td></tr><tr><td>Spinning disk confocal microspopy</td><td>PerkinElmer</td><td>L7267000</td><td></td></tr><tr><td>A temperature-controlled chamber</td><td>Any brand</td><td></td><td>To keep temperature at 37 &amp;deg;C</td></tr><tr><td>A CO&lt;sub&gt;2&lt;/sub&gt; environmental system</td><td>Any brand</td><td></td><td>Optional to maintain CO&lt;sub&gt;2&lt;/sub&gt; concentration optimal</td></tr><tr><td>CO&lt;sub&gt;2&lt;/sub&gt; Independent medium, no glutamine</td><td>invitrogen</td><td>18045-054&amp;nbsp;&amp;nbsp;</td><td>For long time time-lapse imaging</td></tr><tr><td>DMEM, high glucose, HEPES, no phenol red</td><td>invitrogen</td><td>21063-029</td><td>For long time time-lapse imaging</td></tr></tbody></table>

live cell imaging of primary rat neonatal cardiomyocytes following adenoviral and lentiviral transduction using confocal spinning disk microscopy

Kolayca tek bir işlem içinde çok sayıda izole edilebilir, çünkü Birincil sıçan neonatal kardiyomiyositlerde vitro Kardiyovasküler araştırmalarda temel yararlıdır. Nedeniyle mikroskop teknolojisindeki ilerlemeler bu hücrelere fototoksisite ilişkin en az endişe ile gerçek zamanlı olarak hücresel olayları araştırmak amacıyla canlı hücre görüntülerini yakalamak için nispeten kolaydır. Bu protokol hücrenin özelliklerini modüle Lentiviral ve adenoviral transdüksiyon izleyen bir konfokal dönen disk mikroskop kullanılarak primer sıçan yenidoğan kardiyomiyositlerin canlı hücre timelapse görüntüleri çekmek için nasıl açıklar. Virüs iki farklı uygulama daha kolay iki farklı genler için uygun bir iletim hızı ve ekspresyon seviyelerini elde etmek için yapar. Peki odaklı canlı hücre görüntüleri uzun süreler boyunca istikrarlı odak tutar mikroskop otofokus sistemi kullanılarak elde edilebilir. Bu yöntemde, dışsal mühendisinin işlevlerikültürlenmiş primer hücrelerde ifade ed proteinlerin analiz edilebilir. Buna ek olarak, bu sistem siRNA&#39;lar kullanımı yoluyla hem de kimyasal modülatörlerinin genlerin fonksiyonlarını incelemek için kullanılabilir.

Teknik, lentivirüs encoding EGFP (gelişmiş yeşil floresan protein)-etiketli Cx43 (Connexin43) veya hücrelerde EGFP-etiketli proteinleri ifade etmek için kullanılan bir mutasyona uğramış Cx43 32 ve bir adenovirüs kodlama FGFR1DN (fibroblast büyüme faktörü reseptörü 1 baskın negatif açıklamak için ) hücrede 33-35 FGF sinyalizasyon kapatmaya kullanıldı. Kardiyomiyositlerde izolasyonu, aşağıdaki üç gün, izole edilmiş kardiyomiyositlerde hücrelerinde EGFP-etiketli protein...

Watch this Scientific Journal Video about Live Cell Imaging of Primary Rat Neonatal Cardiomyocytes Following Adenoviral and Lentiviral Transduction Using Confocal Spinning Disk Microscopy at JoVE.com

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

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.

İlköğretim Rat Yenidoğan kardiyomiyositlerin Canlı Hücre Görüntüleme Adenoviral izlenerek ve Lentiviral İletimi Confocal Disk Mikroskopi Spinning kullanma

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

live-cell-imaging-primary-rat-neonatal-cardiomyocytes-following

Research

JoVE Journal

Biology

13.5K Görüntüleme.  Max-Planck-Institute for Molecular Biomedicine and Institute of Cell Biology. 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.

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

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.

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.

İzolasyon ve Neonatal Rat kardiyomiyositlerde Kryoprezervasyon

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

Gelişim Biyolojisi

Visualization of Cell Cycle Variations and Determination of Nucleation in Postnatal Cardiomyocytes

Cardiomyocytes are prone to variations of the cell cycle, such as endoreduplication (continuing rounds of DNA synthesis without karyokinesis and cytokinesis) and acytokinetic mitosis (karyokinesis but no cytokinesis). Such atypical cell cycle variations result in polyploid and multinucleated cells rather than in cell division. Therefore, to determine cardiac turnover and regeneration, it is of crucial importance to correctly identify cardiomyocyte nuclei, the number of nuclei per cell, and their cell cycle status. This is especially true for the use of nuclear markers for identifying cell cycle activity, such as thymidine analogues Ki-67, PCNA, or pHH3. Here, we present methods for recognizing cardiomyocytes and their nuclearity and for determining their cell cycle activity. We use two published transgenic systems: the Myh6-H2B-mCh transgenic mouse line, for the unequivocal identification of cardiomyocyte nuclei, and the CAG-eGFP-anillin mouse line, for distinguishing cell division from cell cycle variations. Combined together, these two systems ease the study of cardiac regeneration and plasticity.

To distinguish cell division from cell cycle variations in cardiomyocytes, we present protocols using two transgenic mouse lines: Myh6-H2B-mCh transgenic mice, for the unequivocal identification of cardiomyocyte nuclei, and CAG-eGFP-anillin mice, for distinguishing cell division from cell cycle variations.

Doğum sonrası kardiyomiyositlerde Hücre Döngüsü Varyasyonları görselleştirme ve Çekirdeklenme Belirlenmesi

Cardiomyocytes are prone to variations of the cell cycle, such as endoreduplication (continuing rounds of DNA synthesis without karyokinesis and ...

Ex vivo Live Imaging of Single Cell Divisions in Mouse Neuroepithelium

We developed a system that integrates live imaging of fluorescent markers and culturing slices of embryonic mouse neuroepithelium. We took advantage of existing mouse lines for genetic cell lineage tracing: a tamoxifen-inducible Cre line and a Cre reporter line expressing dsRed upon Cre-mediated recombination. By using a relatively low level of tamoxifen, we were able to induce recombination in a small number of cells, permitting us to follow individual cell divisions. Additionally, we observed the transcriptional response to Sonic Hedgehog (Shh) signaling using an Olig2-eGFP transgenic line 1-3 and we monitored formation of cilia by infecting the cultured slice with virus expressing the cilia marker, Sstr3-GFP 4. In order to image the neuroepithelium, we harvested embryos at E8.5, isolated the neural tube, mounted the neural slice in proper culturing conditions into the imaging chamber and performed time-lapse confocal imaging. Our ex vivo live imaging method enables us to trace single cell divisions to assess the relative timing of primary cilia formation and Shh response in a physiologically relevant manner. This method can be easily adapted using distinct fluorescent markers and provides the field the tools with which to monitor cell behavior in situ and in real time.

Ex vivo Live Imaging of Single Cell Divisions in Mouse Neuroepithelium

Here we develop the tools necessary for ex vivo live imaging to trace single cell divisions in the mouse E8.5 neuroepithelium

Ex vivo Fare neuroepithelium Tek Hücre Bölümler Canlı Görüntüleme

We developed a system that integrates live imaging of fluorescent markers and culturing slices of embryonic mouse neuroepithelium. We took advantage of ...

Nörobilim

Isolation and Genetic Manipulation of Adult Cardiac Myocytes for Confocal Imaging

Cardiac myocytes isolated from adult hearts are widely accepted as a model somewhere half way between embryonic and neonatal muscle cells on one side and a working heart on the other. Thus, cardiomyocytes serve as good models for cardiac cellular physiology and pathophysiology, for pharmaceutical investigations as well as for the exploration of transgenic animal models. Here we describe a method of isolating the cells from the heart. Furthermore we show how a genetic manipulation on cardiac myocytes can be performed without breeding a transgenic animal: This is the combination of long term culture (1 week) and adenoviral gene transfer. The latter one is described from the construction of the virus to the transduction of the cells. It can be used for the expression of genetically encoded biosensors (GEBs), fluorescent fusion proteins, but also for protein over expression and down regulation, e.g. using RNAi. Here we provide an example for the expression of a fusion protein staining a subcellular structure (Golgi). Such protein expression can be visualized by confocal imaging of z-stacks for a 3D-reconstruction of subcellular structures. The protocol comprises state-of-the-art in cell culture, molecular biology and biophysics and thus provides an approach for exploring new horizons in cellular cardiology.

Adult cardiac myocytes are primary cells that can be isolated from animal hearts and cultured for several days. Within this culture period adenoviral gene transfer can be used to express genetically encoded biosensors (GEBs) or fluorescent fusion proteins. Both approaches allow cellular investigations by means of confocal microscopy.

Konfokal Görüntüleme İzolasyon ve Yetişkin kardiyak miyositler Genetik Manipülasyon

Cardiac myocytes isolated from adult hearts are widely accepted as a model somewhere half way between embryonic and neonatal muscle cells on one side and ...

Biyoloji

Live Imaging of Mitosis in the Developing Mouse Embryonic Cortex

Although of short duration, mitosis is a complex and dynamic multi-step process fundamental for development of organs including the brain. In the developing cerebral cortex, abnormal mitosis of neural progenitors can cause defects in brain size and function. Hence, there is a critical need for tools to understand the mechanisms of neural progenitor mitosis. Cortical development in rodents is an outstanding model for studying this process. Neural progenitor mitosis is commonly examined in fixed brain sections. This protocol will describe in detail an approach for live imaging of mitosis in ex vivo embryonic brain slices. We will describe the critical steps for this procedure, which include: brain extraction, brain embedding, vibratome sectioning of brain slices, staining and culturing of slices, and time-lapse imaging. We will then demonstrate and describe in detail how to perform post-acquisition analysis of mitosis. We include representative results from this assay using the vital dye Syto11, transgenic mice (histone H2B-EGFP and centrin-EGFP), and in utero electroporation (mCherry-&#945;-tubulin). We will discuss how this procedure can be best optimized and how it can be modified for study of genetic regulation of mitosis. Live imaging of mitosis in brain slices is a flexible approach to assess the impact of age, anatomy, and genetic perturbation in a controlled environment, and to generate a large amount of data with high temporal and spatial resolution. Hence this protocol will complement existing tools for analysis of neural progenitor mitosis.

Neural progenitor mitosis is a critical parameter of neurogenesis. Much of our understanding of neural progenitor mitosis is based on analysis of fixed tissue. Live imaging in embryonic brain slices is a versatile technique to assess mitosis with high temporal and spatial resolution in a controlled environment.

Gelişmekte Fare Embriyonik Cortex mitoz Canlı Görüntüleme

Although of short duration, mitosis is a complex and dynamic multi-step process fundamental for development of organs including the brain. In the ...

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.

Yalıtım ve yetişkin fare Cardiomyocytes tarımı

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

Tıp

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.

İzolasyon ve Kültür Yenidoğan Fare kardiyomiyositlerin

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

Time-Lapse Imaging of Neuronal Arborization using Sparse Adeno-Associated Virus Labeling of Genetically Targeted Retinal Cell Populations

Discovering mechanisms that pattern dendritic arbors requires methods to visualize, image, and analyze dendrites during development. The mouse retina is a powerful model system for the investigation of cell type-specific mechanisms of neuronal morphogenesis and connectivity. The organization and composition of retinal subtypes are well-defined, and genetic tools are available to access specific types during development. Many retinal cell types also constrain their dendrites and/or axons to narrow layers, which facilitates time-lapse imaging. Mouse retina explant cultures are well suited for live-cell imaging using confocal or multiphoton microscopy, but methods optimized for imaging dendrite dynamics with temporal and structural resolution are lacking. Presented here is a method to sparsely label and image the development of specific retinal populations marked by the Cre-Lox system. Commercially available adeno-associated viruses (AAVs) used here expressed membrane-targeted fluorescent proteins in a Cre-dependent manner. Intraocular delivery of AAVs in neonatal mice produces fluorescent labeling of targeted cell types by 4-5 days post-injection (dpi). The membrane fluorescent signals are detectable by confocal imaging and resolve fine branch structures and dynamics. High-quality videos spanning 2-4 h are acquired from imaging retinal flat-mounts perfused with oxygenated artificial cerebrospinal fluid (aCSF). Also provided is an image postprocessing pipeline for deconvolution and three-dimensional (3D) drift correction. This protocol can be used to capture several cellular behaviors in the intact retina and to identify novel factors controlling neurite morphogenesis. Many developmental strategies learned in the retina will be relevant for understanding the formation of neural circuits elsewhere in the central nervous system.

Here, we present a method for investigating neurite morphogenesis in postnatal mouse retinal explants by time-lapse confocal microscopy. We describe an approach for sparse labeling and acquisition of retinal cell types and their fine processes using recombinant adeno-associated virus vectors that express membrane-targeted fluorescent proteins in a Cre-dependent manner.

Genetik Olarak Hedeflenmiş Retinal Hücre Popülasyonlarının Seyrek Adeno İlişkili Virüs Etiketlemesi Kullanılarak Nöronal Arborizasyonun Hızlandırılmış Görüntülenmesi

Discovering mechanisms that pattern dendritic arbors requires methods to visualize, image, and analyze dendrites during development. The mouse retina is a ...

Isolation, Culture and Transduction of Adult Mouse Cardiomyocytes

Cultured cardiomyocytes can be used to study cardiomyocyte biology using techniques that are complementary to in vivo systems. For example, the purity and accessibility of in vitro culture enables fine control over biochemical analyses, live imaging, and electrophysiology. Long-term culture of cardiomyocytes offers access to additional experimental approaches that cannot be completed in short term cultures. For example, the in vitro investigation of dedifferentiation, cell cycle re-entry, and cell division has thus far largely been restricted to rat cardiomyocytes, which appear to be more robust in long-term culture. However, the availability of a rich toolset of transgenic mouse lines and well-developed disease models make mouse systems attractive for cardiac research. Although several reports exist of adult mouse cardiomyocyte isolation, few studies demonstrate their long-term culture. Presented here, is a step-by-step method for the isolation and long-term culture of adult mouse cardiomyocytes. First, retrograde Langendorff perfusion is used to efficiently digest the heart with proteases, followed by gravity sedimentation purification. After a period of dedifferentiation following isolation, the cells gradually attach to the culture and can be cultured for weeks. Adenovirus cell lysate is used to efficiently transduce the isolated cardiomyocytes. These methods provide a simple, yet powerful model system to study cardiac biology.

This protocol describes a step-by-step method for the reproducible isolation and long-term culture of adult mouse cardiomyocytes with high yield, purity, and viability.

İzolasyon, Kültür ve Yetişkin Fare kardiyomiyositlerde İletimi

Cultured cardiomyocytes can be used to study cardiomyocyte biology using techniques that are complementary to in vivo systems. For example, the purity and ...

Analysis of Cardiac Contractile Dysfunction and Ca2+ Transients in Rodent Myocytes

Contractile dysfunction and Ca2+ transients are often analyzed at the cellular level as part of a comprehensive assessment of cardiac-induced injury and/or remodeling. One approach for assessing these functional alterations utilizes unloaded shortening and Ca2+ transient analyses in primary adult cardiac myocytes. For this approach, adult myocytes are isolated by collagenase digestion, made Ca2+ tolerant, and then adhered to laminin-coated coverslips, followed by electrical pacing in serum-free media. The general protocol utilizes adult rat cardiac myocytes but can be readily adjusted for primary myocytes from other species. Functional alterations in myocytes from injured hearts can be compared to sham myocytes and/or to in vitro therapeutic treatments. The methodology includes the essential elements needed for myocyte pacing, along with the cell chamber and platform components. The detailed protocol for this approach incorporates the steps for measuring unloaded shortening by sarcomere length detection and cellular Ca2+ transients measured with the ratiometric indicator Fura-2 AM, as well as for raw data analysis.

Analysis of Cardiac Contractile Dysfunction and Ca2+ Transients in Rodent Myocytes

A set of protocols are presented that describe the measurement of contractile function via sarcomere length detection along with calcium (Ca2+) transient measurement in isolated rat myocytes. The application of this approach for studies in animal models of heart failure is also included.

Kemirgen Miyositlerde Kardiyak Kasılma Disfonksiyonu ve Ca2+ Geçicilerinin Analizi

Contractile dysfunction and Ca2+ transients are often analyzed at the cellular level as part of a comprehensive assessment of cardiac-induced injury ...