ApplicationNotes | Westernblotonhuman,ratandmousebrainhomogenate:Brainswereisolatedrodentsandhomogenizedat2,800rpmwithaPotter-Elvehjemtypehomogenizerafteradding3volof4°CBufferA(10mMHepes,pH7.2,25mMsucrose,and10mMEGTA)containingproteaseinhibitors(1mMphenylmethylsulfonylfluoride,100μg/mlsoybeantrypsininhibitor,10μg/mlleupeptin,10μg/mlp-toluenesulfonyl-L-argininemethylester,and5μg/mlpepstatinA).Thehomogenatewascentrifuged15minat13,000gthen1hat100,000g,andthesupernatantwascollectedascrudesynaptosomalfraction.ThisfractionwassubjectedtoSDS-PAGEandWesternblotanalysis.Detectsabandofapproximately100kDa(97.4kDa).
Immunofluorescenceonratbraintissuethathasbeenperfusedandfixedwithformaldehyde,7microncutsectionsfrozensections.Hasnotbeentestedonparaffinembeddedtissuesections.
ImmunoprecipitationonTritonX-100extractsofpost-nuclearsupernatantofratbrainhomogenate:brainsfrommaleSpragueDawleyratswerehomogenizedasdescribedabovein4volof4°CRIPAbuffer(50mMTris,pH8.0,150mMNaCl,1mMEDTA,1%TritonX-100,0.5%deoxycholate,and0.1%SDS)containingproteaseinhibitors.Thehomogenatewascentrifugedasaboveandthesupernatantcollectedastheclarifiedextract.Appropriateantibodies(5μg)wereincubatedwith1-mlfractions(15-25mg)oftheclarifiedextracts,andthenpreswollenproteinGbeads(5mg)wereaddedbeforeasecondincubation.Incubationswere2-12hat4°Cwithrotation.Beadsandimmunecomplexeswerecollectedbycentrifuging3minat7,000gandthenrinsed4×5minwiththestartingbufferbeforebeingsubjectedtoSDS-PAGEandWesternblotanalysis.
Optimalworkingdilutionsmustbedeterminedbyenduser. |