Name: preparation of synaptoneurosomes from mouse cortex using a discontinuous percoll-sucrose density gradient
Uploaded: 2011-09-17T14:00:00
Description: Watch this Scientific Journal Video about Preparation of Synaptoneurosomes from Mouse Cortex using a Discontinuous Percoll-Sucrose Density Gradient at JoVE.com

We would like to thank B. K. August from the University of Wisconsin-Madison Electron Microscope Facility for the electron microscopy. This work was supported by NIH grants R01-DA026067 and P30-HD03352 (to J.S.M.).

1. Preparations1-4
<ol>
 <li>Prepare 500 mL of gradient medium (GM) buffer by mixing 50 mL of a 2.5 M sucrose slurry, 2.5 mL of a 1M Tris-HCl, pH7.5 stock, and 0.1 mL of a 0.5 m EDTA, pH 8.0 stock with milli-Q water to volume. Filter sterilize the solution, aliquot and store frozen.</li>
 <li>Prepare a 1000x stock of tetrodotoxin (TTX) by making a 1 mM solution in milli-Q H2O. Aliquots of TTX can be stored at -20&deg;C.</li>
 <li>Prepare 10x Stimulation Buffer by making a solution of 100 mM Tris (...

<ol>
	<li>Westmark, C. J., Malter, J. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=FMRP+mediates+mGluR5-dependent+translation+of+amyloid+precursor+protein.">FMRP mediates mGluR5-dependent translation of amyloid precursor protein.</a> PLoS Biol. 5, e52-e52 (2007).</li><li>Westmark, P. R., Westmark, C. J., Wang, S., Levenson, J., O'Riordan, K. J., Burger, C., Malter, J. S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Pin1+and+PKMzeta+sequentially+control+dendritic+protein+synthesis.">Pin1 and PKMzeta sequentially control dendritic protein synthesis.</a> Sci Signal. 3, ra18-ra18 (2010).</li><li>Dunkley, P. R., Heath, J. W., Harrison, S. M., Jarvie, P. E., Glenfield, P. J., Rostas, J. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+rapid+Percoll+gradient+procedure+for+isolation+of+synaptosomes+directly+from+an+S1+fraction:+Homogeneity+and+morphology+of+subcellular+fractions.">A rapid Percoll gradient procedure for isolation of synaptosomes directly from an S1 fraction: Homogeneity and morphology of subcellular fractions.</a> Brain Res. 441, 59-71 (1988).</li><li>Dunkley, P. R., Jarvie, P. E., Robinson, P. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+rapid+Percoll+gradient+procedure+for+preparation+of+synaptosomes.">A rapid Percoll gradient procedure for preparation of synaptosomes.</a> Nat. Protoc. 3, 1718-1728 (2008).</li><li>Hollingsworth, E. B., McNeal, E. T., Burton, J. L., Williams, R. J., Daly, J. W., Creveling, C. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Biochemical+characterization+of+a+filtered+synaptoneurosome+preparation+from+guinea+pig+cerebral+cortex:+cyclic+adenosine+3':5'-monophosphate-generating+systems,+receptors,+and+enzymes.">Biochemical characterization of a filtered synaptoneurosome preparation from guinea pig cerebral cortex: cyclic adenosine 3':5'-monophosphate-generating systems, receptors, and enzymes.</a> J. Neurosci. 5, 2240-2253 (1985).</li><li>Yi, H., Leunissen, J., Shi, G., Gutekunst, C., Hersch, S. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=A+novel+procedure+for+pre-embedding+double+immunogold-silver+labeling+at+the+ultrastructural+level.">A novel procedure for pre-embedding double immunogold-silver labeling at the ultrastructural level.</a> J. Histochem. Cytochem. 49, 279-284 (2001).</li><li>Akins, M. R., Berk-Rauch, H. E., Fallon, J. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Presynaptic+translation:+stepping+out+of+the+postsynaptic+shadow.">Presynaptic translation: stepping out of the postsynaptic shadow.</a> Front. Neural Circuits. 3, (2009).</li><li>Jin, I., Kandel, E. R., Hawkins, R. D. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Whereas+short-term+facilitation+is+presynaptic,+intermediate-term+facilitation+involves+both+presynaptic+and+postsynaptic+protein+kinases+and+protein+synthesis.">Whereas short-term facilitation is presynaptic, intermediate-term facilitation involves both presynaptic and postsynaptic protein kinases and protein synthesis.</a> Learn. Mem. 18, 96-102 (2011).</li><li>Lyles, V., Zhao, Y., Martin, K. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Synapse+formation+and+mRNA+localization+in+cultured+Aplysia+neurons.">Synapse formation and mRNA localization in cultured Aplysia neurons.</a> Neuron. 49, 349-356 (2006).</li><li>Wagatsuma, A., Azami, S., Sakura, M., Hatakeyama, D., Aonuma, H., Ito, E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=De+Novo+synthesis+of+CREB+in+a+presynaptic+neuron+is+required+for+synaptic+enhancement+involved+in+memory+consolidation.">De Novo synthesis of CREB in a presynaptic neuron is required for synaptic enhancement involved in memory consolidation.</a> J. Neurosci. Res. 84, 954-9560 (2006).</li><li>Sutton, M. A., Schuman, E. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Local+translational+control+in+dendrites+and+its+role+in+long-term+synaptic+plasticity.">Local translational control in dendrites and its role in long-term synaptic plasticity.</a> J. Neurobiol. 64, 116-131 (2005).</li><li>Li, K. -. W., Hornshaw, M. P., Van der Schors, R. C., Watson, R., Tate, S., Casetta, B., Jimenez, C. R. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Proteomics+analysis+of+rat+brain+postsynaptic+density:+implications+of+the+diverse+protein+functional+groups+for+the+integration+of+synaptic+physiology.">Proteomics analysis of rat brain postsynaptic density: implications of the diverse protein functional groups for the integration of synaptic physiology.</a> J. Biol. Chem. 279, 987-1002 (2004).</li><li>Peng, J., Kim, M. J., Cheng, D., Duong, D. M., Gygi, S. P., Sheng, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Semi-quantitative+proteomic+analysis+of+rat+forebrain+postsynaptic+density+fractions+by+mass+spectrometry.">Semi-quantitative proteomic analysis of rat forebrain postsynaptic density fractions by mass spectrometry.</a> J. Biol. Chem. 279, 21003-21011 (2004).</li><li>Kim, S. H., Fraser, P. E., Westaway, D., St. George-Hyslop, P. H. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Group+II+metabotropic+glutamate+receptor+stimulation+triggers+production+and+release+of+Alzheimer's+amyloid+&#x03B2;42+from+isolated+intact+nerve+terminals.">Group II metabotropic glutamate receptor stimulation triggers production and release of Alzheimer's amyloid &#x03B2;42 from isolated intact nerve terminals.</a> J. Neurosci. 30, 3870-3875 (2010).</li><li>Weiler, I. J., Greenough, W. T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Potassium+ion+stimulation+triggers+protein+translation+in+synaptoneurosomal+poiyribosomes.">Potassium ion stimulation triggers protein translation in synaptoneurosomal poiyribosomes.</a> Mol. Cell. Neurosci. 2, 305-314 (1993).</li><li>Billard, J. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Ageing,+hippocampal+synaptic+activity+and+magnesium.">Ageing, hippocampal synaptic activity and magnesium.</a> Magnes Res. 19, 199-215 (2006).</li><li>Murphy, G. G., Fedorov, N. B., Giese, K. P., Ohno, M., Friedman, E., Chen, R., Silva, A. J. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Increased+neuronal+excitability,+synaptic+plasticity,+and+learning+in+aged+Kvbeta1.1+knockout+mice.">Increased neuronal excitability, synaptic plasticity, and learning in aged Kvbeta1.1 knockout mice.</a> Curr. Biol. 14, 1907-1915 (2004).</li><li>Norris, C. M., Halpain, S., Foster, T. C. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Reversal+of+Age-Related+Alterations+in+Synaptic+Plasticity+by+Blockade+of+L-Type+Ca21+Channels.">Reversal of Age-Related Alterations in Synaptic Plasticity by Blockade of L-Type Ca21 Channels.</a> J. Neurosci. 18, 3171-3179 (1998).</li><li>Sallert, M., Malkki, H., Segerstr&#228;lea, M., Tairaa, T., Lauri, S. E. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Effects+of+the+kainate+receptor+agonist+ATPA+on+glutamatergic+synaptic+transmission+and+plasticity+during+early+postnatal+development.">Effects of the kainate receptor agonist ATPA on glutamatergic synaptic transmission and plasticity during early postnatal development.</a> Neuropharm. 52, 1354-1365 (2007).</li><li>Quinlan, E. M., Philpot, B. D., Huganir, R. L., Bear, M. F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Rapid,+experience-dependent+expression+of+synaptic+NMDA+receptors+in+visual+cortex+in+vivo.">Rapid, experience-dependent expression of synaptic NMDA receptors in visual cortex in vivo.</a> Nat. Neurosci. 2, 357-35 (1999).</li><li>Scheetz, A. J., Nairn, A. C., Constantine-Patton, M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=NMDA+receptor-mediated+control+of+proteins+synthesis+at+developing+synapses.">NMDA receptor-mediated control of proteins synthesis at developing synapses.</a> Nat. Neurosci. 3, 211-216 (2000).</li><li>Villasana, L. E., Klann, E., Tejada-Simon, M. V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Rapid+isolation+of+synaptoneurosomes+and+postsynaptic+densities+from+adult+mouse+hippocampus.">Rapid isolation of synaptoneurosomes and postsynaptic densities from adult mouse hippocampus.</a> J. Neurosci. Methods. 158, 30-36 (2006).</li><li>Weiler, I. J., Greenough, W. T. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Metabotropic+glutamate+receptors+trigger+postsynaptic+protein+synthesis.">Metabotropic glutamate receptors trigger postsynaptic protein synthesis.</a> Proc. Natl. Acad. Sci. U.S.A. 90, 7168-7171 (1993).</li><li>Gray, E. G., Whittaker, V. P. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=The+isolation+of+nerve+endings+from+brain:+An+electron+microscopic+study+of+cell+fragments+derived+by+homogenization+and+centrifugation.">The isolation of nerve endings from brain: An electron microscopic study of cell fragments derived by homogenization and centrifugation.</a> J. Anat. 96, 79-88 (1962).</li><li>Gylys, K. H., Fein, J. A., Yang, F., Cole, G. M. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Enrichment+of+Presynaptic+and+Postsynaptic+Markers+by+Size-Based+Gating+Analysis+of+Synaptosome+Preparations+From+Rat+and+Human+Cortex.">Enrichment of Presynaptic and Postsynaptic Markers by Size-Based Gating Analysis of Synaptosome Preparations From Rat and Human Cortex.</a> Cytometry A. 60, 90-96 (2004).</li><li>Haj&#243;s, F. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=An+improved+method+for+the+preparation+of+synaptosomal+fractions+in+high+purity.">An improved method for the preparation of synaptosomal fractions in high purity.</a> Brain Res. 93, 485-489 (1975).</li><li>Bai, F., Witzmann, F. A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Synaptosome+Proteomics.">Synaptosome Proteomics.</a> Subcell. Biochem. 43, 77-98 (2007).</li><li>Rao, A., Steward, O. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Evidence+that+protein+constituents+of+postsynaptic+membrane+specializations+are+locally+synthesized:+analysis+of+proteins+synthesized+within+synaptosomes.">Evidence that protein constituents of postsynaptic membrane specializations are locally synthesized: analysis of proteins synthesized within synaptosomes.</a> J Neurosci. 11, 2881-2895 (1991).</li><li>Pertoft, H., Laurent, T. C., Catsimpoolas, N. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Isopycnic+separation+of+cells+and+cell+organelles+by+centrifugation+and+modified+colloidal+silica+gradients.">Isopycnic separation of cells and cell organelles by centrifugation and modified colloidal silica gradients.</a> Methods of Cell Separation. , 25-65 (1977).</li><li>Ramarao, C. S., Acharya, S. R., Krishnan, K. S., Kenkare, U. W. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=High+affinity+uptake+of+L-glutamate+and+&amp;gamma;-aminobutyric+acid+in+Drosophila+melanogaster.">High affinity uptake of L-glutamate and &amp;gamma;-aminobutyric acid in Drosophila melanogaster.</a> J. Biosci. 11, 119-135 (1987).</li><li>Munteanu, L. S., Dinu, A. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Fractionation+of+granulocytes+from+whole+human+blood+by+centrifugation.+Practical+hints.">Fractionation of granulocytes from whole human blood by centrifugation. Practical hints.</a> Romanian J. Biophys. 14, 53-58 (2004).</li><li>Vlasselaer, P., Van Palathumpat, V. <a target="_blank" href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?db=PubMed&cmd=Search&doptcmdl=Citation&defaultField=Title+Word&term=Cell+separation+composition,+kit+and+method.">Cell separation composition, kit and method.</a> US patent. , (1997).</li></ol>

The discontinuous Percoll-sucrose gradient preparation described herein is a quick, reliable method to isolate active SNs, which can be used in a variety of synaptic transmission experiments. This gradient method, which is based on the method developed by Dunkley et al.,3,4 is a subcellular brain fractionation procedure that isolates both pre- and postsynaptic membrane-derived vesicles that are associated with one another. Without further purification these SNs are compatible with a variety of molecular biolog...

<table border="1">
	<tbody>
		<tr>
			<th>
				Name of the reagent</th>
			<th>
				Company</th>
			<th>
				Catalogue number</th>
			<th>
				Comments (optional)</th>
		</tr>
		<tr>
			<td>Micro BCA Protein Assay Kit</td>
			<td>Pierce</td>
			<td>23235</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>CaCl2</td>
			<td>Fisher</td>
			<td>C79-500</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>CO2 gas</td>
			<td>Airgas (UW-MDS)</td>
			<td>CD 50</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>EDTA</td>
			<td>RPI</td>
			<td>E57020</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>EtOH</td>
			<td>Fisher</td>
			<td>A407SK-4</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>HCl</td>
			<td>Fisher</td>
			<td>A142-212</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Percoll</td>
			<td>GE Healthcare</td>
			<td>17-0891-01</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>KH2PO4</td>
			<td>Fisher</td>
			<td>P285-500</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>PierceSDS-PAGE Sample Prep Kit</td>
			<td>Pierce</td>
			<td>89888</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>NaCl</td>
			<td>RPI</td>
			<td>S23020</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>NaHCO3</td>
			<td>Fisher</td>
			<td>BP328-500</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Na2PHO4</td>
			<td>Fisher</td>
			<td>S381-500</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Sucrose</td>
			<td>RPI</td>
			<td>S24060</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Tris Base</td>
			<td>RPI</td>
			<td>T60040</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Tetrodotoxin</td>
			<td>Sigma</td>
			<td>T5651</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Express Pro Label Mix S35 Easy Tag</td>
			<td>Perkin Elmer</td>
			<td>NEG772</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>&nbsp;</td>
			<td>&nbsp;</td>
			<td>&nbsp;</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<th>
				Equipment</th>
			<th>
				Company</th>
			<th>
				Catalogue number</th>
			<th>
				Comments (optional)</th>
		</tr>
		<tr>
			<td>Dissection tools</td>
			<td>&nbsp;</td>
			<td>&nbsp;</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Dounce homogenizer, 7 mL (comes with two glass pestles labled " A" and "B")</td>
			<td>Wheaton</td>
			<td>&nbsp;</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>P1000 Gilson Pipetman</td>
			<td>Gilson</td>
			<td>F123602</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Allegra 6KR Centrifuge</td>
			<td>Beckman Coulter</td>
			<td>366830</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>GH 3.8 Rotor, Swinging bucket rotor</td>
			<td>Beckman Coulter</td>
			<td>360581</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Beckman J2-21 Centrifuge</td>
			<td>Beckman</td>
			<td>&nbsp;</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Beckman tubes with caps</td>
			<td>Beckman</td>
			<td>355672</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>White walled adapters</td>
			<td>Beckman</td>
			<td>342327</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>Blue walled adapters</td>
			<td>Beckman</td>
			<td>&nbsp;</td>
			<td>&nbsp;</td>
		</tr>
		<tr>
			<td>JA-17 Rotor, Fixed-angle rotor</td>
			<td>Beckman</td>
			<td>369691</td>
			<td>&nbsp;</td>
		</tr>
	</tbody>
</table>
Table of antibodies used for western blots:
<table border="1">
	<tbody>
		<tr>
			<th>
				Name of Antibody</th>
			<th>
				Company</th>
			<th>
				Catalogue number</th>
			<th>
				Host Species</th>
			<th>
				Dilution Factor</th>
		</tr>
		<tr>
			<td>&beta;-Actin</td>
			<td>Sigma</td>
			<td>A5441</td>
			<td>mouse</td>
			<td>1:2000</td>
		</tr>
		<tr>
			<td>GFAP</td>
			<td>Santa Cruz</td>
			<td>sc-65343</td>
			<td>mouse</td>
			<td>1:200</td>
		</tr>
		<tr>
			<td>GP73</td>
			<td>Santa Cruz</td>
			<td>Sc-134509</td>
			<td>rabbit</td>
			<td>1:200</td>
		</tr>
		<tr>
			<td>HSC70</td>
			<td>Santa Cruz</td>
			<td>sc-7298</td>
			<td>mouse</td>
			<td>1:200</td>
		</tr>
		<tr>
			<td>Lamin&beta;</td>
			<td>Santa Cruz</td>
			<td>Sc-6261</td>
			<td>goat</td>
			<td>1:200</td>
		</tr>
		<tr>
			<td>Prohibitin</td>
			<td>Santa Cruz</td>
			<td>sc-28259</td>
			<td>rabbit</td>
			<td>1:200</td>
		</tr>
		<tr>
			<td>PSD95</td>
			<td>Millipore</td>
			<td>MAB1596</td>
			<td>mouse</td>
			<td>5 &mu;g/&mu;L</td>
		</tr>
		<tr>
			<td>SNAP25</td>
			<td>AbCam</td>
			<td>ab5666-100</td>
			<td>rabbit</td>
			<td>1:2000</td>
		</tr>
		<tr>
			<td>Synaptophysin</td>
			<td>Millipore</td>
			<td>MAB368</td>
			<td>mouse</td>
			<td>1:500</td>
		</tr>
		<tr>
			<td>&beta;-3-Tubulin</td>
			<td>Santa Cruz</td>
			<td>sc-80016</td>
			<td>mouse</td>
			<td>1:200</td>
		</tr>
	</tbody>
</table>

preparation of synaptoneurosomes from mouse cortex using a discontinuous percoll-sucrose density gradient

Synaptoneurosomes (SNs) are obtained after homogenization and fractionation of mouse brain cortex. They are resealed vesicles or isolated terminals that break away from axon terminals when the cortical tissue is homogenized. The SNs retain pre- and postsynaptic characteristics, which makes them useful in the study of synaptic transmission. They retain the molecular machinery used in neuronal signaling and are capable of uptake, storage, and release of neurotransmitters.
The production and isolation of active SNs can be problematic using medias like Ficoll, which can be cytotoxic and require extended centrifugation due to high density, and filtration and centrifugation methods, which can result in low activity due to mechanical damage of the SNs. However, the use of discontinuous Percoll-sucrose density gradients to isolate SNs provides a rapid method to produce good yields of translationally active SNs. The Percoll-sucrose gradient method is quick and gentle as it employs isotonic conditions, has fewer and shorter centrifugation spins and avoids centrifugation steps that pellet SNs and cause mechanical damage.

Watch this Scientific Journal Video about Preparation of Synaptoneurosomes from Mouse Cortex using a Discontinuous Percoll-Sucrose Density Gradient at JoVE.com

Preparation of Synaptoneurosomes from Mouse Cortex using a Discontinuous Percoll-Sucrose Density Gradient

A method to prepare translationally active, intact synaptoneurosomes (SNs) from mouse brain cortex is described. The method uses a discontinuous Percoll-sucrose density gradient allowing for the quick preparation of active SNs.

Synaptoneurosomes (SNs) are obtained after homogenization and fractionation of mouse brain cortex. They are resealed vesicles or isolated terminals that ...

Research

JoVE Journal

Neuroscience

Chronic Imaging of Mouse Visual Cortex Using a Thinned-skull Preparation

In vivo imaging using two-photon laser scanning microscopy (2PLSM) allows the study of living cells and neuronal processes in the intact brain. The ...

Patch Clamp Recordings from Mouse Retinal Neurons in a Dark-adapted Slice Preparation

Our visual experience is initiated when the visual pigment in our retinal photoreceptors absorbs photons of light energy and initiates a cascade of ...

Correlating Behavioral Responses to fMRI Signals from Human Prefrontal Cortex: Examining Cognitive Processes Using Task Analysis

Korrelere adfærdsmæssige reaktioner på fMRI Signaler fra Menneskelig præfrontale cortex: Undersøgelse Kognitive processer ved hjælp af Task Analysis

The aim of this methods paper is to describe how to implement a neuroimaging technique to examine complementary brain processes engaged by two similar ...

Isolating LacZ-expressing Cells from Mouse Inner Ear Tissues using Flow Cytometry

Isolerende LacZ-udtrykkende celler fra mus indre øre Væv ved anvendelse af flowcytometri

Isolation of specific cell types allows one to analyze rare cell populations such as stem/progenitor cells. Such an approach to studying inner ear tissues ...

Visualization and Genetic Manipulation of Dendrites and Spines in the Mouse Cerebral Cortex and Hippocampus using In utero Electroporation

Visualization and Genetic Manipulation of Dendrites and Spines in the Mouse Cerebral Cortex and Hippocampus using In utero Electroporation

Visualisering og genetisk manipulering af dendritter og udløberne i mus cerebrale cortex og hippocampus under anvendelse<em&gt; I utero</em&gt; Elektroporation

In utero electroporation (IUE) has become a powerful technique to study the development of different regions of the embryonic nervous system 1-5. To date ...

Functional Imaging of Auditory Cortex in Adult Cats using High-field fMRI

Funktionel Imaging af Auditory Cortex i voksne katte ved hjælp af High-felt fMRI

Current knowledge of sensory processing in the mammalian auditory system is mainly derived from electrophysiological studies in a variety of animal ...

Live Imaging of Mitosis in the Developing Mouse Embryonic Cortex

Live-Imaging mitosens i udviklingslandene mus embryonale Cortex

Although of short duration, mitosis is a complex and dynamic multi-step process fundamental for development of organs including the brain. In the ...

Two-Photon in vivo Imaging of Dendritic Spines in the Mouse Cortex Using a Thinned-skull Preparation

Two-Photon in vivo Imaging of Dendritic Spines in the Mouse Cortex Using a Thinned-skull Preparation

To-foton<em&gt; In vivo</em&gt; Imaging af dendritiske spidser i Mouse Cortex Ved hjælp af en tyndere-kranium Forberedelse

In the mammalian cortex, neurons form extremely complicated networks and exchange information at synapses. Changes in synaptic strength, as well as ...

Preparation of Synaptic Plasma Membrane and Postsynaptic Density Proteins Using a Discontinuous Sucrose Gradient

Fremstilling af Synaptic plasmamembranen og postsynaptiske Density Proteiner hjælp af en Diskontinuerlig sucrosegradient

Neuronal subcellular fractionation techniques allow the quantification of proteins that are trafficked to and from the synapse. As originally described in ...

Investigating the Function of Deep Cortical and Subcortical Structures Using Stereotactic Electroencephalography: Lessons from the Anterior Cingulate Cortex

Undersøgelse Funktionen af ​​Deep subkortikale strukturer ved hjælp Stereotaktisk Elektroencefalografi: Erfaringer fra forreste cingulate Cortex

Stereotactic Electroencephalography (SEEG) is a technique used to localize seizure foci in patients with medically intractable epilepsy. This procedure ...