Name: determination of lipid raft partitioning of fluorescently-tagged probes in living cells by fluorescence correlation spectroscopy (fcs)
Uploaded: 2012-04-06T13:00:00
Description: Watch this Scientific Journal Video about Determination of Lipid Raft Partitioning of Fluorescently-tagged Probes in Living Cells by Fluorescence Correlation Spectroscopy FCS at JoVE.com

Dit werk werd ondersteund door een subsidie ​​van Agence Nationale de la Recherche (Choad). We zijn ook dankbaar voor de Fondation ICM (Institut du Cerveau et de la Moelle) voor hun financiële steun.

1. Kalibratie van de FCS Setup <ol><li> Start de confocale microscoop, lasers, computers, incubator voor temperatuur-en CO 2-controle. </li><li> Zorg ervoor dat de SPAD (Single Photon Avalanche Diode) is ingeschakeld en de fluorescentie filter in de SPAD is zeer geschikt voor uw monster. Controleer of de SPAD wordt gesynchroniseerd in de tijd. Let op alleen begin je FCS-software zodra je SPAD instellingen zijn klaar voor overname. </li><li> Bereid een verse oplossing van cholera toxine Alexa488 verdund in P...

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De FCS hier gepresenteerde methode zorgt voor een gevoelige en snelle analyse van de lipid raft verdeling van fluorescerende probes van belang in levende cellen. FCS combineert de nauwkeurigheid van de lokalisatie van confocale microscopie met de gevoeligheid van single photon tellen. Het belangrijkste verschil tussen FCS en standaard technieken is dat biochemische FCS de absolute bepaling van de rafts verdeling van het doel en niet de relatieve verdeling kan zoals het geval is DRM isolatie of co-patching. <p class=...

<html><table border="1"><tbody><tr><td> Naam van het serum </td><td> Vennootschap </td><td> Catalogusnummer </td><td> Reacties </td></tr><tr><td> Cholera toxine subunit B-Alexa 488 </td><td> Invitrogen </td><td> C-34775 </td><td> MW (pentameer) = 57 kg / mol </td></tr><tr><td> Confocale microscoop </td><td> Leica </td><td> SP5 </td><td></td></tr><tr><td> Incubator voor temperatuur-en CO 2-controle </td><td> Life imaging-diensten </td><td> De Cube en de Box </td><td></td></tr><tr><td> SPAD (Single Photon Avalanche Diode) </td><td> MPD (Micro Devices Photon) </td><td> PDM serie (100 micrometer gevoelig gebied) </td><td></td></tr><tr><td> High-pass filter 488 nm </td><td> Semrock </td><td> 488 nm blokkeren rand BrightLine lange-pass-filter Part #ails.aspx? id = FF01-488/LP-25 &quot;target =&quot; _blank &quot;&gt; FF01-488/LP-25 </td><td></td></tr><tr><td> FCS-eenheid </td><td> Picoquant </td><td> Picoharp 300 module </td><td></td></tr><tr><td> Aan-en auto-correlatie-software </td><td> Picoquant </td><td> SymPhoTime </td><td></td></tr><tr><td> Aanpassoftware </td><td> OriginLab </td><td> OriginPro8 </td><td></td></tr></tbody></table>

determination of lipid raft partitioning of fluorescently-tagged probes in living cells by fluorescence correlation spectroscopy (fcs)

In de afgelopen vijftien jaar het idee dat de celmembranen niet homogeen zijn en vertrouwen op microdomeinen om hun taken uit te oefenen is op grote schaal geaccepteerd. Lipid rafts zijn membraan microdomeinen verrijkt in cholesterol en sfingolipiden. Ze spelen een rol in de cellulaire fysiologische processen, zoals het signaleren, en de handel 1,2, maar wordt ook gedacht dat de belangrijkste spelers in een aantal ziekten, waaronder virale of bacteriële infecties en neurodegeneratieve ziekten 3. Maar hun bestaan ​​is nog steeds onderwerp van controverse 4,5. Inderdaad, lipid raft grootte van naar schatting rond de 20 nm 6 te zijn, ver onder de resolutie limiet van conventionele microscopie (ongeveer 200 nm), waardoor zich verzet tegen hun directe beeldvorming. Tot nu toe de belangrijkste technieken gebruikt om de verdeling van eiwitten van belang in lipid rafts te beoordelen waren reinigingsmiddelenbestendige Membranen (DRM&#39;s) isolatie en co-patching met antilichamen. Hoewel gebruikte becahet gebruik van hun vrij makkelijk de uitvoering, deze technieken waren gevoelig voor artefacten en dus kritiek op 7,8. Technische verbeteringen waren daarom noodzakelijk om deze artefacten te overwinnen en om te kunnen lipid rafts partitie sonde in levende cellen. Hier presenteren we een methode voor de gevoelige analyse van lipide rafts verdeling van fluorescent-gemerkte eiwitten of lipiden in het plasmamembraan van levende cellen. Deze methode genoemd Fluorescentie Correlatie Spectroscopie (FCS), gebaseerd op het verschil in diffusie tijden fluorescerende probes binnen of buiten rafts. In feite, zoals blijkt uit zowel kunstmatige membranen en celculturen, zou probes verspreiden veel sneller buiten dan binnen dichte lipid rafts 9,10. Diffusie tijd te bepalen, worden minuten fluorescentie schommelingen gemeten als functie van de tijd in een knooppunt (ongeveer 1 femtoliter), gelegen aan de plasmamembraan van cellen met een confocale microscoop (Fig.1). De auto-correlatie curves kan vervolgens worden getrokken uit deze schommelingen en met de juiste wiskundige diffusiemodellen 11. FCS kan worden aan de lipide vlot verdeling van verschillende probes, zolang zij fluorescent gelabeld bepalen. Fluorescerende labels kan worden bereikt door de expressie van fluorescerende fusie-eiwitten of door binding van fluorescerende liganden. Bovendien kan FCS niet alleen worden gebruikt in kunstmatige membranen en cellijnen, maar ook in primaire kweken zoals beschreven onlangs 12. Het kan ook worden gebruikt om de dynamiek van lipide vlot afscherming volgen verslavingen membraan lipiden verandering 12.

Watch this Scientific Journal Video about Determination of Lipid Raft Partitioning of Fluorescently-tagged Probes in Living Cells by Fluorescence Correlation Spectroscopy FCS at JoVE.com

Determination of Lipid Raft Partitioning of Fluorescently-tagged Probes in Living Cells by Fluorescence Correlation Spectroscopy FCS

Een techniek om de lipid raft verdeling van fluorescerende eiwitten in de plasmamembraan van levende cellen sonde wordt beschreven. Het maakt gebruik van de verschillen in verspreiding tijden van eiwitten die gelegen zijn binnen of buiten van lipide rafts. Overname kan dynamisch worden uitgevoerd in controle omstandigheden of na drugsverslaving.

Bepaling van de lipid raft van afscherming van fluorescent-gelabelde probes in levende cellen met behulp van fluorescentie Correlatie Spectroscopie (FCS)

In the past fifteen years the notion that cell membranes are not homogenous and rely on microdomains to exert their functions has become widely accepted. ...

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Determination of Lipid Raft Partitioning of Fluorescently-tagged Probes in Living Cells by Fluorescence Correlation Spectroscopy (FCS)

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