Name: single-cell microinjection for cell communication analysis
Uploaded: 2017-02-26T13:00:00
Description: Watch this Scientific Journal Video about Single-cell Microinjection for Cell Communication Analysis at JoVE.com

The authors dedicate this paper in honor of Prof. Gilberto Oliveira-Castro who introduced research in intercellular communication by gap junctions in Brazil. This work was funded by Capes, CNPQ and Faperj.

<html> 1. Bereiding van Cellen <ol><li> Handhaaf een kweek van een thymus epitheelcellijn (IT76M1) of te testen cel in een incubator (37 ° C / 5% CO 2). </li><li> Was de cellen met PBS 1x (herhaal dit item 3x). </li><li> Trypsine toevoegen aan de cellen gedurende 5 min. </li><li> voeg medium (tweemaal de hoeveelheid trypsine toegevoegd punt 1,3) met 10% FBS (foetaal runderserum) aan de cellen met trypsine en gecentrifugeerd (800 xg gedurende 5 minuten). </li><li> Tel de cellen in een hemocytometer. </li><li...

<ol>
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Om de aanwezigheid van functionele intercellulaire gap junction, het gebruik van tracers die ondoorlaatbaar membraan zijn te verifiëren, maar permeabel door intercellulaire kanalen 16 vereist. Fluoresceïne, de eerste fluorescerende kleurstof te observeren cel-cel koppeling 22, permeabel tussen niet junctional 3 membranen en is derhalve vervangen door Lucifer Yellow 15 kleurstof. Op dit moment, op zoek naar de beste keuze ui...

Gap junctions zijn intercellulaire kanalen die de onderlinge communicatie mogelijk maken tussen naburige cellen 1. Deze mededeling verbindt twee of meer naburige cellen, waarbij elk bijdraagt ​​met een connexon of hemikanaal aan de intercellulaire kanaal te vormen. In zoogdiercellen is de connexon gevormd door zes connexines, monomeren met vier transmembraandomeinen en een C- en N-terminale binnen het cytoplasma 2. Gap junctions niet alleen mogelijk de stroom van ionen, second messengers en kleine metabolieten, maar ook bij vele vormen van cellulaire communicatie in vele fysiologische processen, zoals synaptische transmissie, hart contractie, celgroei en differentiatie 3, 4, 5, 6, 7, 8. Daarnaast zijn gap junctions geassocieerd metveel ziekten waaronder kanker 9, 10, 11 spieratrofie, sommige genetische ziekten en demyelineringsziekten 12. Dit type intercellulaire overspraak kan worden geëvalueerd door verscheidene werkwijzen 13, 14, 15, 16. In dit artikel laten we zien hoe een eencellige micro-injectie van Lucifer Yellow uit te voeren om cellulaire communicatie via gap-junctions te visualiseren in levende cellen. We bespreken hoe de cellen en de micropipet, het gebruik van de micromanipulator en de injectie van Lucifer Yellow kleurstof in een thymus epitheelcellijn bereiden. Meestal kan deze experimentele procedure wordt geanalyseerd door de gemiddelde geschakelde cellen met de cel geladen met kleurstof. Bovendien kan deze methode worden gebruikt met andere fluorescente kleurstoffen met een molecuulgewicht onder de spleetknooppunten cut-off die ongeveer 1.000 dalton.

<table border="0" cellpadding="0" cellspacing="0" width="1228">
	<tbody>
		<tr height="21">
			<td height="21" style="height:21px;width:195px;">Lucifer yellow</td>
			<td style="width:71px;">Sigma</td>
			<td style="width:137px;">L0259</td>
			<td style="width:827px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:195px;">Lithium Chloride</td>
			<td style="width:71px;">Sigma</td>
			<td style="width:137px;">L4408</td>
			<td style="width:827px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:195px;">PBS tablets</td>
			<td style="width:71px;">Sigma&#160;</td>
			<td style="width:137px;">P4417</td>
			<td style="width:827px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:195px;">RPMI</td>
			<td style="width:71px;">Sigma</td>
			<td style="width:137px;">R4130</td>
			<td style="width:827px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:195px;">Bovine fetal serum</td>
			<td style="width:71px;">Cultilab</td>
			<td style="width:137px;"></td>
			<td style="width:827px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;width:195px;">Trypsin</td>
			<td style="width:71px;">Sigma</td>
			<td style="width:137px;">T4799</td>
			<td style="width:827px;"></td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Microscope</td>
			<td style="width:71px;">Nikon</td>
			<td style="width:137px;">TE-2000</td>
			<td>For microinjection experiments, one needs an inverted fluorescence microscope and &#64257;lters for &#64258;uorescent microscopy</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">vibration-insulated table&#160;</td>
			<td style="width:71px;">Newport</td>
			<td style="width:137px;">VH3036W-OPT</td>
			<td>A vibration-insulated table is needed to protect the experiments from vibration and avoid cell damage</td>
		</tr>
		<tr height="21">
			<td height="21" style="height:21px;">Micromanipulator</td>
			<td style="width:71px;">Narishige</td>
			<td style="width:137px;">MMO-203</td>
			<td>This equipment allows precision adjustments of the micropipette, which is needed for cell micro injection.</td>
		</tr>
		<tr height="100">
			<td height="100" style="height:100px;">Current Generator&#160;</td>
			<td style="width:71px;">Digitimer</td>
			<td style="width:137px;">DS2</td>
			<td>To produce the dye flow through the micropipette, a current below one nano ampere was given using a current generator with an electrode inside the micropipette or an amplifier which has a capacitance compensation circuit (old electrometer) or current injection functions of new patch clamp amplifiers, and the ground wire submersed in the plate dish. Alternatively, the dye can be injected by a pneumatic microinjector, following the factory recommendations.&#160;&#160;&#160;</td>
		</tr>
	</tbody>
</table>

single-cell microinjection for cell communication analysis

Gap junctions are intercellular channels that allow the communication of neighboring cells. This communication depends on the contribution of a hemichannel by each neighboring cell to form the gap junction. In mammalian cells, the hemichannel is formed by six connexins, monomers with four transmembrane domains and a C and N terminal within the cytoplasm. Gap junctions permit the exchange of ions, second messengers, and small metabolites. In addition, they have important roles in many forms of cellular communication within physiological processes such as synaptic transmission, heart contraction, cell growth and differentiation. We detail how to perform a single-cell microinjection of Lucifer Yellow to visualize cellular communication via gap-junctions in living cells. It is expected that in functional gap junctions, the dye will diffuse from the loaded cell to the connected cells. It is a very useful technique to study gap junctions since you can evaluate the diffusion of the fluorescence in real time. We discuss how to prepare the cells and the micropipette, how to use a micromanipulator and inject a low molecular weight fluorescent dye in an epithelial cell line.

Thymus epitheel cellijn IT-76MI werden gebruikt om kleurstof koppeling te evalueren door gap junctions als deze cellen werden beschreven functionele gap junctions gevormd door connexine 43 21 uit te drukken. Figuur 1 toont de injectie van Lucifer Yellow wanneer toegepast in een cel onder de punt van de pipet. Na enkele minuten, verbonden cellen fluorescentie (sterretjes) die de diffusie van de fluorescerende kleurstof via gap junctions. Het aantal cellen en de tij...

Watch this Scientific Journal Video about Single-cell Microinjection for Cell Communication Analysis at JoVE.com

Single-cell Microinjection for Cell Communication Analysis

We beschrijven hier hoe je een eencellige micro-injectie van Lucifer Yellow uit te voeren om cellulaire communicatie via gap-junctions te visualiseren in levende cellen, en een aantal nuttige tips. We verwachten dat dit artikel iedereen zal helpen om de mate van cellulaire koppeling te evalueren door functionele gap junctions. Alles hier beschreven kan zijn, in principe, aangepast aan andere fluorescente kleurstoffen met een molecuulgewicht onder 1000 Dalton.

Eencellige micro-injectie voor mobiele Communicatie Analyse

Gap junctions are intercellular channels that allow the communication of neighboring cells. This communication depends on the contribution of a ...

Hi, my name is Anael. I work at Oswaldo Cruz Foundation at Cellular Communication Laboratory. We study here P2 Receptors and gap injection in the context of immune system and liver.Today, I will present you the microinjection of cell. Gap injections play some physiological roles as synapse transmission, heart contractions, and others. For this technique, we can study if the gap injections are functional or not.Okay, let's see the base components of the microinjection setup. Here we have the inverted fluorescence microscope where we will see the cells. This is a CCD camera to record the results.We have here the current generator that we will introduce the dye into the cell. Next we have the holder where the microelectrode is connected. And the micro-manipulator that's connected to the holder and allow the movement of the microelectrode in the three axis, Z, Y, and X.Before start the experiment, we have to make the microelectrode.We use this borosilicate glass capillary and this equipment named polar. We attach the borosilicate capillary here. This tungsten filament we will heat to make two microelectrodes.Now the tungsten filament's heating and the wave here we will pull down to make the two microelectrodes.Easy. Our first step is to fill the microelectrode with the dye. One tip here is that you have to fill only the tip with a few microliters to do the experiment.It's not necessary to fill everything. Note with more details. Fill only the tip.Let's start an experiment. We have here the cells in the petri dish, in a sodium solution. The silver wire connected to the current generator.We have now to attach the microelectrodes in the head stage. Here in the head stage we have another silver wire also connected to the current generator. Once the microelectrode is attached, we can put it inside of the bath.Note that the tip of the pipette is carefully touching the bath. This procedure is make very carefully to avoid the crash of the tip in the bottom of the petri dish. Once inside of the bath, we can go to the microscope to look for the shadow of the micropipette.We recommend we start looking in the magnification lens. When we find the shadow of the pipette, we can move the microelectrode toward the cell using the micromanipulator. Once it's very close to the cell, we can do a test post to verify if the microelectrode's not obstructed.How we will see next. Here we are seeing the micropipette and we are adjusting the micropipette very close to the cell. We can see cell movement right and left.Then we change to the filter, fluorescence filter. We can apply hyperpolarizing pulse to test if the tip of the pipette is not obstructed. Since the micropipette is inside of the cell, we can apply hyperpolarizing pulse to load the cell with the dye.We use here the loose free yellow dye. After loading the cell with the dye, if the neighbor cells are connected by gap injections, we wait some minutes and we will see neighbor cells brightening by the diffusion of the dye by these gap injections. In our experiment we can see five cells, marked with stars, showing fluorescence.Here there is a good example of an experiment of microinjection in thymic epithelial cells, in A and B.In the figures C and D, shows a microinjection in thymic inert cell of loose free yellow and another dye, not permeable to gap injection showed in the insert. The figure E and F thymic epithelial cell line microinjected with loose free yellow and in the insert loose free yellow and a gap injection block. The results show that loose free yellow did not spread to the neighbor cells.Next we see a microinjection in thymic epithelial cells, in presence of dexamethasone and the quantification in B.Dexamethasone increased the degree of coupling, as showed in the figure B.Of 100 injections, the number of three or four cells connected was more frequent in the presence of this drug. I hope I could help beginners to do this important technique to cellular communication study. Thanks and bye bye.

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