Preparación de Synaptoneurosomes de ratón con una corteza discontinua de Percoll-sacarosa gradiente de densidad
Summary
Un método para preparar translationally activa, synaptoneurosomes intacta (SN) de la corteza cerebral del ratón se describe. El método utiliza una discontinua de Percoll-sacarosa gradiente de densidad que permite la rápida preparación de los ganglios centinela activa.
Abstract
Synaptoneurosomes (SN) se obtienen después de la homogeneización y fraccionamiento de la corteza cerebral del ratón. Que se hara vesículas o terminales aislados que rompen con terminales de los axones en el tejido cortical se homogeneiza. El SNS conservar las características pre-y post-sináptica, lo que hace que sean útiles en el estudio de la transmisión sináptica. Conservan la maquinaria molecular utilizados en la señalización neuronal y que son capaces de captación, almacenamiento y liberación de neurotransmisores.
La producción y el aislamiento de ganglios centinela activa puede ser problemático, utilizando como medios de Ficoll, que pueden ser citotóxicos y requieren centrifugación extendido debido a la alta densidad, y la filtración y el método de centrifugado, que puede resultar en una baja actividad debido a los daños mecánicos del SNS. Sin embargo, el uso de gradientes de densidad de sacarosa discontinua de Percoll para aislar SN proporciona un método rápido para producir un buen rendimiento del SNS translationally activo. El método del gradiente de Percoll-sacarosa es rápida y suave, ya que emplea a condiciones isotónicas, tiene menos y más cortas tiradas centrifugación y evita pasos de centrifugación que la SNS pellet y causar daños mecánicos.
Protocol
Discussion
Lo discontinuo de Percoll-sacarosa gradiente de preparación descrito en este documento es un método rápido y fiable para aislar activos del SNS, que se puede utilizar en una variedad de experimentos de transmisión sináptica. Este método del gradiente, que se basa en el método desarrollado por Dunkley et al. 3,4, es un procedimiento de fraccionamiento subcelular cerebro que aísla tanto de pre-y post-sinápticas derivados vesículas de membrana que se asocian unas con otras. Sin más purificación estos…
Disclosures
The authors have nothing to disclose.
Acknowledgements
Nos gustaría agradecer a BK agosto en la Universidad de Wisconsin-Madison Fondo microscopio electrónico para la microscopía electrónica. Este trabajo fue apoyado por subvenciones del NIH R01-DA026067 y P30 HD03352 (a 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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