Preparando E18 neurônios de rato Fetal Cortical para Compartimentação Antes de começar, é importante para aquecer todos os meios necessários e reagentes para 37 ° C. Também é importante para esterilizar tudo o que é usado para preparar as células (por exemplo, lâmpadas de borracha, suportes de tubos, frascos de mídia, etc), e aquilo que é colocado na capa, limpando-se com etanol 70%. <ol><li> Coloque dois pedaços de E18 Cortex Rato Fetal (um cérebro, previamente dissecado) em um tubo de 15 ml contendo 1 ml gelada de cálcio sem magnésio livre de buffer de dissecção. </li><li> Adicionar 1 ml de 0,25% Tripsina-EDTA para o córtex em tampão dissecção, elevando o volume final de 2 ml de tripsina e concentração final de 0,125%. </li><li> Colocar o tubo de 15 ml em um banho de água 37 ° C por 8 minutos. </li><li> Durante este tempo, o fogo polonês 3 pipetas de vidro Pasteur, formando aberturas sucessivamente menores, em um armário de biossegurança para ajudar a manter a esterilidade. </li><li> Após a incubação 8 minutos do córtex, adicione 10 ml de DMEM contendo 10% FBS para o córtex para ajudar a parar a reação de tripsina. </li><li> Centrifugar o tubo contendo 15 ml do córtex e DMEM/10% FBS a 2500 rpm por 2 minutos. </li><li> No armário de biossegurança, remover o sobrenadante do córtex usando um copo pipeta Pasteur com sucção a vácuo em anexo. Tenha cuidado para não perturbar ou deslocar o pellet. </li><li> Adicionar 1 ml da NMB ao pellet córtex e gentilmente pipeta cima e para baixo. É muito importante para evitar a criação de bolhas de ar enquanto pipetagem cima e para baixo, como as bolhas de ar podem danificar as células por oxidação. </li><li> Use o fogo-polido pipeta Pasteur com a mais ampla abertura para triturar o córtex, anexando um bulbo de borracha estéreis até o fim e pipetagem cima e para baixo 5 vezes, novamente tomando cuidado para não introduzir bolhas de ar. Continue esse processo com as outras duas pipetas de vidro, cada uma com um tamanho de abertura diminuiu. </li><li> Após a trituração, centrifugação as células novamente a 2500 rpm por 2 minutos. </li><li> Após a centrifugação, uma vez remover o sobrenadante e ressuspender o pellet celular em 2 ml de NBM. </li><li> Filtrar a solução de células ressuspenso através de um filtro de células 45 um. </li><li> Mancha as células com Trypan Blue, contados, e carregado no dispositivos. Normalmente, carga de 20 ul de células por dispositivo. </li></ol> Nota: a concentração final de células é tipicamente entre 2,5 milhões de células / ml e 8 milhões de células / ml Carregando as células Depois que as células foram contadas, é hora de carregar as pilhas no dispositivo: <ol><li> Traga os dispositivos previamente preparado contendo NBM para a cabine de segurança biológica para manter a esterilidade. </li><li> Retire o excesso de mídia dos poços por sucção a vácuo. No entanto, ter cuidado para evitar a remoção de todos os meios de comunicação - deve haver alguns meios de comunicação no canal principal. </li><li> Aplicar 20 ul de células para o reservatório superior esquerdo do dispositivo (veja o diagrama se necessário). O fluxo de células dentro do dispositivo e anexar à superfície PLL tratada. </li><li> Depois de carregar, colocar os dispositivos contendo células de volta em uma incubadora por 10 minutos para permitir que as células para anexar. </li><li> Após 10 minutos, preencher os reservatórios com a mídia e dispositivos lugar de volta na incubadora. </li></ol>

<ol>
	<li>Park, J. W., Vahidi, B., Taylor, A. M., Rhee, S. W., Jeon, N. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Microfluidic+culture+platform+for+neuroscience+research.">Microfluidic culture platform for neuroscience research.</a> Nat Protoc. 1, 2128-2136 (2006).</li><li>Taylor, A. M., Blurton-Jones, M., Rhee, S. W., Cribbs, D. H., Cotman, C. W., Jeon, N. L. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+microfluidic+culture+platform+for+CNS+axonal+injury,+regeneration+and+transport.">A microfluidic culture platform for CNS axonal injury, regeneration and transport.</a> Nat Methods. 2, 599-605 (2005).</li></ol>

Densidades de células pode ser variado, dependendo da aplicação. No entanto, a semeadura em neurônios primários muito baixa de uma densidade normalmente leva à morte celular. Dependendo da incubadora e do nível de umidade, a mídia pode ter de ser alterado nos dispositivos a cada 2 a 3 dias. Ao mudar de mídia, é importante após a remoção da mídia a partir dos reservatórios, para nunca remover a mídia dos canais principais. Além disso, é boa prática colocar novas mídias nos poços superior e permitir que alguns meios de comunicação fresca a fluir através do dispositivo e para os principais canais antes de encher todos os reservatórios.

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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">	
		
		<div>
		<table border="1">
		<thead>
		<tr>
		<th>Material Name</th>
		<th>Type</th>
		<th>Company</th>
		<th>Catalogue Number</th>
		<th>Comment</th>
		</tr>
		</thead>
		<tbody>
		
<tr>
<td>NBM</td>
<td>medium</td>
<td>Invitrogen</td>
<td>21103-049</td>
<td>Neural Basal Media is obtained by Invitrogen under their Gibco line of cell culture reagents.</td>
</tr>
<tr>
<td>E18 rat embryos</td>
<td>Animal</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>Obtained from pregnant Sprague Dawley Rats. The pregnant rat is sacrificed and the E18 fetal rat pups dissected to obtain the E18 fetal rat cortex.</td>
</tr>
<tr>
<td>CMFM dissection buffer HBSS</td>
<td>buffer</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>ice-cold Calcium-free Magnesium-free dissection buffer HBSS based.</td>
</tr>
<tr>
<td>15 ml Tube</td>
<td>Tool</td>
<td>BD Falcon</td>
<td>Falcon No. 352097</td>
<td>Available through Fisher Scientific catalog number 14-959-70C</td>
</tr>
<tr>
<td>0.25% Trypsin-EDTA</td>
<td>Reagent</td>
<td>Invitrogen</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>37&#x02DA;C water bath</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>Pasteur pipets</td>
<td>&nbsp;</td>
<td>Fisher Scientific</td>
<td>&nbsp;</td>
<td>glass</td>
</tr>
<tr>
<td>DMEM</td>
<td>medium</td>
<td>Invitrogen</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<tr>
<td>FBS</td>
<td>Reagent</td>
<td>Invitrogen</td>
<td>&nbsp;</td>
<td>serum, used at 10% in DMEM</td>
</tr>
<tr>
<td>centrifuge</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>&nbsp;</td>
<td>set at 2500 rpm </td>
</tr>
<tr>
<td>Trypan Blue</td>
<td>&nbsp;</td>
<td>Invitrogen</td>
<td>&nbsp;</td>
<td>for counting live/dead cells</td>
</tr>
<tr>
<td>BD Falcon Cell Strainer 40 um</td>
<td>Tool</td>
<td>BD Falcon</td>
<td>Falcon cat# 352340</td>
<td>Available through Fisher Scientific. Fisher catalog# 08-771-1</td>
</tr>
<tr>
<td>B27</td>
<td>Reagent</td>
<td>Invitrogen</td>
<td>17504-044</td>
<td>B27 is a proprietary supplement available through Invitrogen under their Gibco line of cell culture reagents.</td>
</tr>
<tr>
<td>Glutamax</td>
<td>Reagent</td>
<td>Invitrogen</td>
<td>35050-061</td>
<td>Glutamax is available through Invitrogen under their Gibco line of celll culture reagents.</td>
</tr>		</tbody>
		</table>
		</div>

preparing e18 cortical rat neurons for compartmentalization in a microfluidic device

Neste vídeo, demonstramos a preparação de E18 neurônios de rato cortical. E18 neurônios de rato cortical são obtidos a partir E18 córtex do rato fetal previamente dissecados e preparados. O córtex é E18, à dissecção, imediatamente dissociado em neurônios individuais. É possível armazenar E18 córtex em Hibernate tampão contendo B27 E a 4 ° C por até uma semana antes da dissociação é realizada. No entanto, haverá uma queda na viabilidade celular. Normalmente obtemos o nosso E18 Cortex fresco. Ele é transportado para o laboratório em gelo frio livre de buffer Cálcio Magnésio dissecção livre (CMFM). Após a chegada, a tripsina é adicionado ao córtex para uma concentração final de 0,125%. O córtex é, então, incubados a 37 ° C por 8 minutos. DMEM contendo 10% FBS é adicionado ao córtex para parar a reação. O córtex é então centrifugado a 2500 rpm por 2 minutos. O sobrenadante é removido e 2 ml de Neural Mídia Basal (NBM) que contenha 2% B27 (vol / vol) e 0,25% Glutamax (vol / vol) é adicionado para o córtex, que é então re-suspenso por pipetando para cima e para baixo. Em seguida, o córtex é triturado previamente fogo com pipetas de vidro polido, cada um com uma abertura sucessivas menores. Após trituração, o córtex é mais uma vez centrifugado a 2500 rpm por 2 minutos. O sobrenadante é então removido eo pellet córtex re-suspenso com 2 ml de NBM contendo B27 e Glutamax. A suspensão de células é então passado através de um filtro de células 40 hum nylon. Em seguida as células são contadas. Os neurônios estão agora prontos para carregar no dispositivo micro neurônio.

Watch this Scientific Journal Video about Preparing E18 Cortical Rat Neurons for Compartmentalization in a Microfluidic Device at JoVE.com

Preparing E18 Cortical Rat Neurons for Compartmentalization in a Microfluidic Device

Neste vídeo mostramos a preparação de E18 neurônios de rato Cortical.

Preparando E18 neurônios de rato para Cortical Compartimentação em um dispositivo micro

In this video, we demonstrate the preparation of E18 cortical rat neurons. E18 cortical rat neurons are obtained from E18 fetal rat cortex previously ...

preparing-e18-cortical-rat-neurons-for-compartmentalization

Research

JoVE Journal

Biology

19.6K visualizações.  University of California, Irvine (UCI). Neste vídeo mostramos a preparação de E18 neurônios de rato Cortical.

Vídeo: Preparing E18 Cortical Rat Neurons for Compartmentalization in a Microfluidic Device

Organotypic Slice Culture of E18 Rat Brains

Organotypic slice cultures from embryonic rodent brains are widely used to study brain development. While there are often advantages to an in-vivo system, organotypic slice cultures allow one to perform a number of manipulations that are not presently feasible in-vivo. To date, organtotypic embryonic brain slice cultures have been used to follow individual cells using time-lapse microscopy, manipulate the expression of genes in the ganglionic emanances (a region that is hard to target by in-utero electroporation), as well as for pharmacological studies. In this video protocol we demonstrate how to make organotypic slice cultures from rat embryonic day 18 embryos. The protocol involves dissecting the embryos, embedding them on ice in low melt agarose, slicing the embedded brains on the vibratome, and finally plating the slices onto filters in culture dishes. This protocol is also applicable in its present form to making organotypic slice cultures from different embryonic ages for both rats and mice. 

Cultura Slice organotípicas de E18 cérebros de ratos

Organotypic slice cultures from embryonic rodent brains are widely used to study brain development. While there are often advantages to an in-vivo system, ...

Biologia

Fabrication of a Microfluidic Device for the Compartmentalization of Neuron Soma and Axons

In this video, we demonstrate the technique of soft lithography with polydimethyl siloxane (PDMS) which we use to fabricate a microfluidic device for culturing neurons. Previously, a silicon wafer was patterned with the design for the neuron microfluidic device using SU-8 and photolithography to create a master mold, or what we simply refer to as a "master". Next, we pour the silicon polymer PDMS on top of the master which is then cured by heating the PDMS to 80&deg;C for 1 hour. The PDMS forms a negative mold of the device. The PDMS is then carefully cut and lifted away from the master. Holes are punched where the reservoirs will be and the excess PDMS trimmed away from the device. Nitrogen is used to blow away any excess debris from the device. At this point the devices are now ready for use and can either bonded to corning No. 1 cover glass with a plasma sterilizer/cleaner or can be reversibly bound to the cover glass by simply placing the device on top of the cover glass. The reversible bonding of the device to glass is covered in a separate video and requires first that the device be sterilized either with 70% ethanol or by autoclaving. Plasma treating sterilizes the devices so no further treatment is necessary. It is, however, important, when plasma-treating the devices, to add liquid to the devices within 10 minutes of the plasma treatment while the surfaces are still hydrophilic. Waiting longer than 10 minutes to add liquid to the device makes it difficult for the liquid to enter the device. The neuron devices are typically plasma-bound to cover glass and 0.5 mg/ml poly-L-lysine (PLL) in pH 8.5 borate buffer is immediately added to the device. After a minimum of 3 hours incubating with PLL, the devices are washed with dH2O water a minimum of 3 times with at least 15 minutes between each wash. Next, the water is removed and fresh media is added to the device. At this point the device is ready for use. It is important to remember at this point to never remove all the media from the device. Always leave media in the main channel.

In this video we demonstrate the technique of soft lithography with polydimethyl siloxane (PDMS) which we use to farbricate a microfluidic device for culturing neurons.

Fabricação de um dispositivo micro para a compartimentação de Neuron Soma e axônios

In this video, we demonstrate the technique of soft lithography with polydimethyl siloxane (PDMS) which we use to fabricate a microfluidic device for ...

A Microfluidic Device with Groove Patterns for Studying Cellular Behavior

We describe a microfluidic device with microgrooved patterns for studying cellular behavior. This microfluidic platform consists of a top fluidic channel and a bottom microgrooved substrate. To fabricate the microgrooved channels, a top poly(dimethylsiloxane) (PDMS) mold containing the impression of the microfluidic channels was aligned and bonded to a microgrooved substrate. Using this device, mouse fibroblast cells were immobilized and patterned within microgrooved substrates (25, 50, 75, and 100 &mu;m wide). To study apoptosis in a microfluidic device, media containing hydrogen peroxide, Annexin V, and propidium iodide was perfused into the fluidic channel for 2 hours. We found that cells exposed to the oxidative stress became apoptotic. These apoptotic cells were confirmed by Annexin V that bound to phosphatidylserine at the outer leaflet of the plasma membrane during the apoptosis process. Using this microfluidic device with microgrooved patterns, the apoptosis process was observed in real-time and analyzed by using an inverted microscope containing an incubation chamber (37&deg;C, 5% CO2). Therefore, this microfluidic device incorporated with microgrooved substrates could be useful for studying the cellular behavior and performing high-throughput drug screening.

We describe a protocol for the fabrication of microfluidic devices that can enable cell capture and culture. In this approach patterned microstructures such as grooves within microfluidic channels are used to create low shear stress regions within which cell can dock.

Um dispositivo micro com padrões Groove para estudar o comportamento celular

We describe a microfluidic device with microgrooved patterns for studying cellular behavior.  This microfluidic platform consists of a top fluidic channel ...

A Gradient-generating Microfluidic Device for Cell Biology

 The fabrication and operation of a gradient-generating microfluidic device for studying cellular behavior is described.  A microfluidic platform is an enabling experimental tool, because it can precisely manipulate fluid flows, enable high-throughput experiments, and generate stable soluble concentration gradients.  Compared to conventional gradient generators, poly(dimethylsiloxane) (PDMS)-based  microfluidic devices can generate stable concentration gradients of growth factors with well-defined profiles.  Here, we developed simple gradient-generating microfluidic devices with three separate inlets.  Three microchannels combined into one microchannel to generate concentration gradients.  The stability and shape of growth factor gradients were confirmed by fluorescein isothyiocyanate (FITC)-dextran with a molecular weight similar to epidermal growth factor (EGF).  Using this microfluidic device, we demonstrated that fibroblasts exposed to concentration gradients of EGF migrated toward higher concentrations.  The directional orientation of cell migration and motility of migrating cells were quantitatively assessed by cell tracking analysis.  Thus, this gradient-generating microfluidic device might be useful for studying and analyzing the behavior of migrating cells.

We describe a protocol for the microfabrication of the gradient-generating microfluidic device that can generate spatial and temporal gradients in well-defined microenvironment. In this approach, the gradient-generating microfluidic device can be used to study directed cell migration, embryogenesis, wound healing, and cancer metastasis.

Um dispositivo de geração de Gradient microfluídicos de Biologia Celular

 The fabrication and operation of a gradient-generating microfluidic device for studying cellular behavior is described.  A microfluidic platform is an ...

CD4+ T-Lymphocyte Capture Using a Disposable Microfluidic Chip for HIV

CD4 + T-linfócitos Captura Usando um chip descartável microfluídicos para HIV

Cell Capture Using a Microfluidic Device

Captura de célula usando um dispositivo micro

Preparing T Cell Growth Factor from Rat Splenocytes

Maintenance of antigen-specific T cell lines or clones in culture requires rounds of antigen-induced activation separated by phases of cell expansion 1,2. Addition of interleukin 2 to the culture media during the expansion phase is necessary to prevent cell death and sufficient to maintain short-term T cell lines but has been shown to increase Th1 polarization 3. Replacement of interleukin 2 by T cell growth factor (TCGF) which contains a mix of cytokines is more effective than interleukin 2 in maintaining long-term T cell lines in vitro 3. Moreover, TCGF can easily be prepared in large amounts in the laboratory and is much cheaper than recombinant interleukin 2. 
Here, we show how to prepare TCGF from rat splenocyte culture supernatants. For this procedure, we harvest spleens from naive Lewis rats euthanized for thymus and blood collection. We prepare single-cell suspensions from the spleens, lyze the red blood cells by osmotic shock, and seed the splenocytes in culture medium. The cells are stimulated with concanavalin A, a mitogen that non-selectively activates all rat T lymphocytes, inducing the production of cytokines. The culture supernantant is collected 48 hours later andexcess concanavalin A is bound to alpha methyl mannoside to prevent it from activating T cell lines to which TCGF will be added. The TCGF is then sterile-filtered, aliquoted, and stored at -20&deg;C.

We describe the preparation of T cell growth factor used for the in vitro expansion of antigen-specific rat T lymphocyte lines.

Preparando-se Fator de Crescimento de Células T esplenócitos Rat

Maintenance of antigen-specific T cell lines or clones in culture requires rounds of antigen-induced activation separated by phases of cell expansion 1,2. ...

Assessing Neural Stem Cell Motility Using an Agarose Gel-based Microfluidic Device

While microfluidic technology is reaching a new level of maturity for macromolecular assays, cell-based assays are still at an infant stage1. This is largely due to the difficulty with which one can create a cell-compatible and steady microenvironment using conventional microfabrication techniques and materials. We address this problem via the introduction of a novel microfabrication material, agarose gel, as the base material for the microfluidic device. Agarose gel is highly malleable, and permeable to gas and nutrients necessary for cell survival, and thus an ideal material for cell-based assays. We have shown previously that agarose gel based devices have been successful in studying bacterial and neutrophil cell migration2. In this report, three parallel microfluidic channels are patterned in an agarose gel membrane of about 1mm thickness. Constant flows with media/buffer are maintained in the two side channels using a peristaltic pump. Cells are maintained in the center channel for observation. Since the nutrients and chemicals in the side channels are constantly diffusing from the side to center channel, the chemical environment of the center channel is easily controlled via the flow along the side channels. Using this device, we demonstrate that the movement of neural stem cells can be monitored optically with ease under various chemical conditions, and the experimental results show that the over expression of epidermal growth factor receptors (EGFR) enhances the motility of neural stem cells. Motility of neural stem cells is an important biomarker for assessing cells aggressiveness, thus tumorigenic factor3. Deciphering the mechanism underlying NSC motility will yield insight into both disorders of neural development and into brain cancer stem cell invasion.

We demonstrate that the over expression of epidermal growth factor receptors (EGFR) enhances the motility of neural stem cells(NSCs) using a novel agarose gel based microfluidic device. This technology can be readily adaptable to other mammalian cell systems where cell sources are scarce, such as human neural stem cells, and the turn around time is critical.

Avaliar motilidade celular Neural Stem Usando um dispositivo Agarose Gel baseado microfluídicos

While microfluidic technology is reaching a new level of maturity for macromolecular assays, cell-based assays are still at an infant stage1. This is ...

Protocol for Culturing Sympathetic Neurons from Rat Superior Cervical Ganglia (SCG)

The superior cervical ganglia (SCG) in rats are small, glossy, almond-shaped structures that contain sympathetic neurons.  These neurons provide sympathetic innervations for the head and neck regions and they constitute a well-characterized and relatively homogeneous population (4).  Sympathetic neurons are dependent on nerve growth factor (NGF) for survival, differentiation and axonal growth and the wide-spread availability of NGF facilitates their culture and experimental manipulation (2, 3, 6).  For these reasons, cultured sympathetic neurons have been used in a wide variety of studies including neuronal development and differentiation, mechanisms of programmed and pathological cell death, and signal transduction (1, 2, 5, and 6).  Dissecting out the SCG from newborn rats and culturing sympathetic neurons is not very complicated and can be mastered fairly quickly.  In this article, we will describe in detail how to dissect out the SCG from newborn rat pups and to use them to establish cultures of sympathetic neurons.  The article will also describe the preparatory steps and the various reagents and equipment that are needed to achieve this.

Protocol for Culturing Sympathetic Neurons from Rat Superior Cervical Ganglia SCG

This is a protocol describing how to isolate and culture primary sympathetic neurons from superior cervical ganglia (SCG) of newborn rat pups.

Protocolo para Neurônios Cultivar Sympathetic de Gânglios Superior Rat Cervical (SCG)

The superior cervical ganglia (SCG) in rats are small, glossy, almond-shaped structures that contain sympathetic neurons.  These neurons provide ...

Calcium Imaging of Cortical Neurons using Fura-2 AM

Calcium imaging is a common technique that is useful for measuring calcium signals in cultured cells. Calcium imaging techniques take advantage of calcium indicator dyes, which are BAPTA-based organic molecules that change their spectral properties in response to the binding of Ca2+ ions. Calcium indicator dyes fall into two categories, ratio-metric dyes like Fura-2 and Indo-1 and single-wavelength dyes like Fluo-4. Ratio-metric dyes change either their excitation or their emission spectra in response to calcium, allowing the concentration of intracellular calcium to be determined from the ratio of fluorescence emission or excitation at distinct wavelengths.  The main advantage of using ratio-metric dyes over single wavelength probes is that the ratio signal is independent of the dye concentration, illumination intensity, and optical path length allowing the concentration of intracellular calcium to be determined independently of these artifacts. One of the most common calcium indicators is Fura-2, which has an emission peak at 505 nM and changes its excitation peak from 340 nm to 380 nm in response to calcium binding.  Here we describe the use of Fura-2 to measure intracellular calcium elevations in neurons and other excitable cells.

Calcium signals play a key role in many cellular processes including gene expression, survival and differentiation. Here we demonstrate how to perform calcium imaging using Fura-2 AM. Calcium imaging is a valuable tool to study the regulation of intracellular calcium in real time and its regulation of signaling cascades.

Imagem de cálcio dos neurônios corticais usando Fura-02:00

Calcium imaging is a common technique that is useful for measuring calcium signals in cultured cells. Calcium imaging techniques take advantage of calcium ...