ApplicationNotes | SUGGESTEDPROTOCOLFORUSINGFLUORO-JADE®C
Processing:Halfofeachgroupofbrainswereparaffinembeddedandcutonarotarymicrotomewhiletheremainderwerecutonafreezingslidingmicrotome.Paraffinsectionswere10uminthicknesswhilefrozensectionswerecutatathicknessof25um.Priortostaining,sectionsweremountedfromdistilledwaterontogelledslides.Gelatincoatedslideswerepreparedbyimmersionina60degreeCsolutionof1%pigskingelatin(Sigma;typeA,300Bloom)andthenovendriedovernightatthesametemperature.Thesectionsweremountedontotheslidesfromdistilledwaterandthenairdriedforatleast30minonaslidewarmerat50degreesC.Slidesbearingfrozencuttissuesectionswerefirstimmersedinabasicalcoholsolutionconsistingof1%sodiumhydroxidein80%ethanolfor5min.Theywerethenrinsedfor2minin70%ethanol,for2minindistilledwater,andthenincubatedin0.06%potassiumpermanganatesolutionfor10min.Followinga1-2minwaterrinse,theslideswerethentransferredfor10mintoa0.0001%solutionofFluoro-Jade®Cdissolvedin0.1%aceticacidvehicle.Theproperdilutionwasaccomplishedbyfirstmakinga0.01%stocksolutionofthedyeindistilledwaterandthenadding1mLofthestocksolutionto99mLof0.1%aceticacidvehicle.Theworkingsolutionwasusedwithin2hofpreparation.Thestocksolution,whenrefrigerated,canbekeptforlongperiodsbutshouldbediscardedifthesolutionbecomescloudy.Theslideswerethenrinsedthroughthreechangesofdistilledwaterfor1minperchange.Excesswaterwasdrainedontoapapertowel,andtheslideswerethenairdriedonaslidewarmerat50degreesCforatleast5min.Theairdriedslideswerethenclearedinxyleneforatleast1minandthencoverslippedwithDPX(FlukaorSigma)nonfluorescentmountingmedia.Polarcoverslippingmedia,suchasthosethatcontainwater,alcoholorglycerolwereneverused.Forcomparativepurposes,someslideswerestainedwithFluoro-Jade®Baccordingtothepreviouslydescribedprocedure.Whenworkingwithparaffinprocessedtissue,thesectionsarefirstdeparaffinizedthroughtwo10minchangesofxyleneandthenthesectionsarerehydratedthroughagraduatedalcoholseries,omittingthebasicalcoholsolution.Onceindistilledwater,thesectionsaretransferredtothepotassiumpermanganatesolutionatwhichpointthestainingprocedureisidenticaltothatdescribedforfrozensections.Multiplelabeling:Fluoro-Jade®CcanreadilybecombinedwithotherfluorescentMarkers.Multiplelabelingwasachievedusinganti-glialfibrillaryacidicprotein(GFAP)immunocytochemistrytolabelactivatedastrocyteswhileusingDAPItolabelnuclearDNA.Incorporating4",6-diamidino-2-phenylindole(DAPI;Sigma,St.LouisMO)asafluorescentnuclearstainisaccomplishedbysimplyincorporating0.0001%intotheFluoro-Jade®Cstainingsolution.Thisisaccomplishedbytheadditionof1mlof0.01%DAPIstocksolutionto99mlof0.1%aceticacid.Fluoro-Jade®CwasalsocombinedwithimmunofluorescentlabelingofGFAPaccordingtothefollowingprocedure.Loosefrozentissuesectionswereincubatedinapredilutedsolutionofanti-GFAP(ChemiconhasanumberofdifferentantibodiestoGFAP)atabout5degreesCintherefrigeratorfor1-3days.Itshouldbementionedthatalthoughinthisstudyallimmunocytochemistrywasperformedonfrozensections,themethodsarefullycompatiblewithparaffinprocessedtissueaswell.Sectionswererinsedintwochangesofbufferedsalinefor10mineachandthentransferredtoatetramethylrhodamineisothiocynate(TRITC)labeledsecondaryantibody(ChemiconhasanumberofdifferentTRITClabeledsecondaryantibodies),diluted1:100inbufferedsaline,for1hatroomtemperature.Sectionswererinsedintwochangesofbufferedsalinefor10mineachandthenthesectionsweremountedontogelledslidesfromdistilledwaterandairdriedonaslidewarmerat50degreesCfor30min.TocombinewithFluoro-Jade®C,theslidemountedsectionswererehydratedfor2minindistilledwaterandthentransferredtothe0.06%potassiumpermanganatesolutionfor10min.Itisworthmentioningthattheincubationtimeinpotassiumpermanganatemayneedtobereducedwhenco-localizingthoseantigenicepitopessusceptibletochemicaloxidation.Theslideswerethenrinsedfor2minindistilledwater,transferredtotheFluoro-Jade®Cworkingsolutionfor10minandthenrinsed,airdehydrated,xyleneclearedandcoverslippedwithDPX,aspreviouslydescribed.ThebluenuclearlabelconferredbyDAPIisvisualizedviaultravioletlightexcitation,whiletheredTRITClabeledantibodyisvisualizedbygreenlightexcitation. |