Préparation de Synaptoneurosomes de Mouse Cortex en utilisant un gradient de densité discontinu de Percoll-sucrose
Summary
Une méthode pour préparer translation active, synaptoneurosomes intacte (SNS) de la souris cortex cérébral est décrite. La méthode utilise un gradient de densité discontinu de Percoll-sucrose permettant la préparation rapide de SNS active.
Abstract
Synaptoneurosomes (SNS) sont obtenus après homogénéisation et fractionnement de cortex cérébral de la souris. Ils sont refermés vésicules ou des terminaux isolés que rompre avec terminaisons axonales lorsque le tissu cortical est homogénéisé. Le SNS conserver des caractéristiques pré-et post-synaptiques, ce qui les rend utiles dans l'étude de la transmission synaptique. Ils conservent la machinerie moléculaire utilisée dans la signalisation neuronale et sont capables d'absorption, le stockage et la libération de neurotransmetteurs.
La production et l'isolement de SNS active peut être problématique médias utilisant comme Ficoll, qui peuvent être cytotoxiques et nécessitent une centrifugation prolongée due à haute densité, et la filtration et des méthodes de centrifugation, ce qui peut entraîner une faible activité en raison de dommages mécaniques de la SNS. Cependant, l'utilisation des gradients de densité discontinu de Percoll-sucrose pour isoler SN fournit une méthode rapide pour produire de bons rendements de SNS translation active. La méthode du gradient Percoll-sucrose est rapide et en douceur car il emploie des conditions isotoniques, a fait tourner la centrifugation moins nombreux et plus courts et évite les étapes de centrifugation que les SRS granulés et causer des dommages mécaniques.
Protocol
Discussion
La préparation gradient discontinu de Percoll-sucrose décrite ici est une méthode rapide et fiable d'isoler actifs SN, qui peut être utilisé dans une variété d'expériences de la transmission synaptique. Cette méthode de gradient, qui est basé sur la méthode développée par Dunkley et al., 3,4 est une procédure cerveau subcellulaire fractionnement qui isole à la fois pré-et post-synaptiques à la membrane des vésicules dérivées qui sont associés à un autre. Sans autre purification d…
Disclosures
The authors have nothing to disclose.
Acknowledgements
Nous tenons à remercier BK août de l'Université de Wisconsin-Madison Facilité microscope électronique pour la microscopie électronique. Ce travail a été soutenu par des subventions du NIH R01-DA026067 et P30-HD03352 (pour la JSM).
Materials
| Name of the reagent | Company | Catalogue number | Comments (optional) |
|---|---|---|---|
| Micro BCA Protein Assay Kit | Pierce | 23235 | |
| CaCl2 | Fisher | C79-500 | |
| CO2 gas | Airgas (UW-MDS) | CD 50 | |
| EDTA | RPI | E57020 | |
| EtOH | Fisher | A407SK-4 | |
| HCl | Fisher | A142-212 | |
| Percoll | GE Healthcare | 17-0891-01 | |
| KH2PO4 | Fisher | P285-500 | |
| PierceSDS-PAGE Sample Prep Kit | Pierce | 89888 | |
| NaCl | RPI | S23020 | |
| NaHCO3 | Fisher | BP328-500 | |
| Na2PHO4 | Fisher | S381-500 | |
| Sucrose | RPI | S24060 | |
| Tris Base | RPI | T60040 | |
| Tetrodotoxin | Sigma | T5651 | |
| Express Pro Label Mix S35 Easy Tag | Perkin Elmer | NEG772 | |
| Equipment | Company | Catalogue number | Comments (optional) |
| Dissection tools | |||
| Dounce homogenizer, 7 mL (comes with two glass pestles labled ” A” and “B”) | Wheaton | ||
| P1000 Gilson Pipetman | Gilson | F123602 | |
| Allegra 6KR Centrifuge | Beckman Coulter | 366830 | |
| GH 3.8 Rotor, Swinging bucket rotor | Beckman Coulter | 360581 | |
| Beckman J2-21 Centrifuge | Beckman | ||
| Beckman tubes with caps | Beckman | 355672 | |
| White walled adapters | Beckman | 342327 | |
| Blue walled adapters | Beckman | ||
| JA-17 Rotor, Fixed-angle rotor | Beckman | 369691 |
Table of antibodies used for western blots:
| Name of Antibody | Company | Catalogue number | Host Species | Dilution Factor |
|---|---|---|---|---|
| β-Actin | Sigma | A5441 | mouse | 1:2000 |
| GFAP | Santa Cruz | sc-65343 | mouse | 1:200 |
| GP73 | Santa Cruz | Sc-134509 | rabbit | 1:200 |
| HSC70 | Santa Cruz | sc-7298 | mouse | 1:200 |
| Laminβ | Santa Cruz | Sc-6261 | goat | 1:200 |
| Prohibitin | Santa Cruz | sc-28259 | rabbit | 1:200 |
| PSD95 | Millipore | MAB1596 | mouse | 5 μg/μL |
| SNAP25 | AbCam | ab5666-100 | rabbit | 1:2000 |
| Synaptophysin | Millipore | MAB368 | mouse | 1:500 |
| β-3-Tubulin | Santa Cruz | sc-80016 | mouse | 1:200 |
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