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How do you culture your Drosophila cells?
I.MEDIUM A.S2,S2C,S2*,S2R+,S3,l(2)mbn,Kc(167),&DL2cells: Schneider"s/10%FBS/PS450mlSchneider"smedium(Gibco#11720-034)(pouroff50mlintoFalcontosaveasserum-free)***[S2R+andKccellswillnotgrowinSchneider"smediumfromSigma]50mlFetalBovineSerum(JRH#12103-78P)-HeatInactivated(aliquotedin-20)5ml1:100Penicillin-Streptomycin(Gibco#15070-063)(aliquotedin-20) Sterilefilter(0.2µ)Storeat4oC-donotfreeze B.ML-DmBG2&ML-DmBG6cells: M3/10%FBS/PS/Insulin450mlShieldsandSangM3insectmedium(Sigma#S8523)(pouroff50mlintoFalcontosaveasserum-free)50mlFetalBovineSerum(JRH#12103-78P)-HeatInactivated(aliquotedin-20)5ml1:100Penicillin-Streptomycin(Gibco#15070-063)(aliquotedin-20)10ug/mlInsulin(Sigma#I6634) Sterilefilter(0.2µ)Storeat4oC-donotfreeze C.clone8(CL8)cells: CompleteM3MediumShieldsandSangM3insectmedium(Sigma#S3652)2%FetalBovineSerum(JRH#12103-78P)-HeatInactivated(aliquotedin-20)2.5%Flyextract(seebelow)0.0125IU/mlInsulin(Sigma#I6634)1xPenicillin-Streptomycin(Gibco#15070-063)(aliquotedin-20) Sterilefilter(0.2µ) HeatInactivatingFetalBovineSerum InsulinStock(100x)Dissolve10mg(25IU)in0.5mlof0.01NHCL.Heatin37oCtodissolveforfewminutes.Add19.5mLofM3Mediatobringvolumeupto20mL.FilterSterilizewitha0.22µmfilter.Alliquotandstorestockat-20oC.Workingstockmaybekeptat4oCfor4-5weeks. FlyExtract II.GROWTHCONDITIONS Cellsgrow@23-25oCand@RTDonotneedCO2Splitevery3-4daystomaintainDensitysensitive-dieiftoodenseortoodilute III.MAINTENANCE Splitoneflaskofcells(mostrecentdate)intotwonewT75flasks(VWR#BD353136)whencultureisconfluent.Keepotherflaskasabackup.Monitorgrowthstatusbymicroscopybeforesplittinganddecidewhethertoadjustrecommendeddilutionfactoraccordingly. A.Semi-adherentcelllines-willsticktonewflaskbutcomelooseovertimeS2* 3-4days 1:3-1:4 S2c 3-4days 1:3-1:4 Kc(167) 3-4days 1:3-1:4 l(2)mbn 3-4days 1:3-1:4
B.Adherentcelllines
DL2 | 3-4days | 1:8(1:5-1:10) |
S3 | 3-4days | 1:3 |
S2R+ | 3-4days | 1:3-1:4 |
CL8 | 4-5days | 1:5-1:10 |
BG2 | 4-5days | 1:3-1:4 |
BG6 | 4-5days | 1:3-1:4 |
SL2,S2C,S2*
DetachcellsfromtheflaskeitherbybangingorscrapingPipetcellsupanddownabout10timestoresuspendcellsandseparateclumpsAliquotcellsintonewflasksaccordingly
DL2,DL1,S2R+,Kc167,Clone8,S3
Protocol1:RemoveallmediumScrapecellswithscraperResuspendcellswith10mLoffreshmedium,pipettingupanddownabout10timesAliquotcellsintonewflasksaccordingly
Protocol2:RemovemediumWashinPBStoremoveanyserumAdd5mltrypsin;letsit5-10"Bangcellsoffflask.Add5mlserummediumtoinactivatetrypsinandwashremainingcellsoffbottomofflask.Spindowncellsat1200-1400rpmfor5min.Resuspendcellsinserummedium.Aliquotcellsintonewflasksaccordingly
Protocol3:DetachcellsfromtheflaskeitherbybangingorscrapingPipetcellsupanddownabout10timestoresuspendcellsandseparateclumpsAliquotcellsintonewflasksaccordingly
BG2
Removemedium(saveandfilterthroughsyringefilterforuseas"conditionedmedium").WashinPBStoremoveanyserumAdd5mltrypsin;letsit5-10"Bangcellsoffflask.Add5mlserummediumtoinactivatetrypsinandwashremainingcellsoffbottomofflask.Spindowncellsat1200-1400rpmfor5min.Resuspendcellsinconditionedmedium.Aliquotcellsintonewflasksaccordingly
CanalsouseAccutaseinsteadoftrypsin.
IV.FREEZING
Growcellstosubconfluencey-approximately1-2x107cells/ml.Labelappropriate#ofcryovials.Removecellsfromflask(trypsinizeandresuspendinmediumifnecessary).Countcells.Spincellsat1200rpm5"Aspirateoffmedium.Resuspendatapproximately1.1x107cells/mlinfreezingmedium:FBS+10%DMSO,filteredORCompletemedium+10%DMSO,filteredAliquot1mlcellsuspension/cryovial.Putvialsinfoambox,tapeclosed,andplacein-70oC.Afterafewdays,transfervialstoLN2forlongtermstorage.
V.THAWING
Prepare15mlconicaltubewith5mlmedium.Thawcellsquicklyinwaterbath.Justbeforecellsarecompletelythawed,decontamiatetheoutsideofthetubewith70%EtOH.Transferthecellstotheconicaltubewith5mlmedium.Spinat1200rpm5".Aspirateandresuspendcellsin5mlmedium.PlateinaT25flask.Watchdaily.Initially,cellsmayneedtobesplitatirregularintervals.
VI.COUNTING
Remove~0.5mlcellsfromflask(trypsinizecellsifnecessary)intoEppendorf.DilutecellsintoTrypanBlueaccordingtoestimateddensity.(confluentculturestry30:70µlto50:50µlofcells:TB).Transfer10-12µlcellstohaemocytometer.Countcellsinoppositecorners(~100-200/largesquare).Calcuation:(count#1+count#2)/2x(dilutionfactor)x104=Xcells/ml(usually~1-10x107)
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