| ApplicationNotes | Immunohistochemistry:(6μg/ml) 
 FlowCytometry:(0.2μg/100μl/10E6cells)Optimalworkingdilutionsmustbedeterminedbyenduser.
 
 APPLICATIONS
 
 Flowcytometry:ThemethodbelowisbasedonthatofM.Vanderlaanetal.(1986).Variationsofthismethodexistintheliterature,oneconsiderationbeingtheeffectvariousfixationprocedureshaveonthelight-scatteringpropertiesofdifferentcellpopulations.Procedure:
 
 1.Tolabelcells,pulsewith10μMbromodeoxyuridinefor30minutes.Harvestcellsfromculture.
 
 2.Fixcellsin70%ethanolat+2-8°Cforatleast30min.ExtracthistonesbyresUSPendingcellsin1mLchilled0.1MHCIcontaining0.5%TritonX-100;incubatethesuspensiononicefor10minutes.Diluteacidwith5mLdistilledwaterandcentrifugeat200xgfor10min.Resuspendcellsin2mLdistilledwater.
 
 3.DenaturecellularDNAbysubmergingthecellsuspensionintoaboilingwaterbathfor10min.Afterwards,quicklycoolbyplacingthecellsuspensioninaniceslurryforseveralminutes.WashcellsinPBSthatcontains0.5%TritonX-100.
 
 4.Resuspendthecells(1-2x106cells)in100μLofsolutioncontainingapproximately2μg/mLanti-bromodeoxyuridineantibodydilutedinPBScontaining0.1%BSA(0.2μg/test).Incubatefor30minatroomtemperature.WashcellswithPBS.
 
 5.Resuspendcellsin100μLofdilutedgoatanti-mouseIgG-FlTCWashcellswithPBS.
 
 APPLICATIONS(Cont.)
 
 Immunohistochemistry:BelowisaprocedureforstainingcellsthathavebeenlabeledwithBrdUinvivoorinvitro.TheprocedureisbasedonthemethodsofB.Schutteetal.(1987)andD.Campanaetal.(1988).
 
 Preparationoftissue:
 
 Injectanimalwith50mgBrdU/kgbodyweight.Sacrificeanimalonehourlaterandremoveorganortissueunderstudy.EmbedtissueinOCTmediumandsnap-freezebyimmersionintoliquidnitrogen.Cut4mmfrozensectionswithacryostat.Placesectionsoneitheralbumin-orgelatin-coatedslides.
 
 Preparationofcells:
 
 Pulsecellswith10mMBrdUfor60min.Cellsgrownoncoverslips,orcytocentrifugepreparationsmadefromcellsgrowninsuspension,canbeusedforanti-bromodeoxyuridinestainingaccordingtotheprocedurebelow.
 
 Procedure
 
 1.Fixtissuesectionsorcells(onslideorcoverglass)byimmersinginabsolutemethanolfor10minutesat+2-8°C.Airdryafterremovingfromfixative.Theslidescanbestoredat-20°Cinasealedbox,orrehydratedtopreparefortheassayprocedure.Torehydrate,immerseinPBSfor3min.
 
 2.DenatureDNAbyincubatingtheslidesin2NHCIfor60minat+37°C.
 
 3.Neutralizetheacidbyimmersingtheslidesin0.1Mboratebuffer,pH8.5.Changethebuffertwiceovera10minperiod.
 
 4.WashslideswithPBS,changingthesolutionthreetimesovera10minperiod.
 
 5.Placeslidesinahumidifiedchamber(e.g.,asealedplasticboxlayeredwithwetpapertowels)andcovercellswith150-300μLofsolutioncontainingapproximately6μg/mLanti-bromodeoxyuridineantibodydilutedinPBSwith0.1%BSA.Incubatefor60minatroomtemperature.
 
 6.WashslideswithPBS,changingthesolutionthreetimesovera10minperiod.
 
 7.Applyoptimaldilutionofasecondantibodyconjugate(e.g.,anti-mouseIgG-peroxidase),incubate,wash,andperformdetectionwithasubstratethatproducesaninsolubleproduct.Afterdetection,counterstainwithHarris-modifiedhematoxylinifdesired.Slidescanthenbedehydratedandmounted.
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