Preparationoffeeder-freemedium
1.ThawmTeSR15XSupplement(Cat.no.05850,STEMCELLTechnologies)atroomtemperatureorovernightat4°C.
2.Addthe100mLofthawed5XSupplementto400mLBasalMediumforatotalvolumeof500mLaseptically.Mixwell.Filterthrougha0.2μm,low-proteinbindingfilter,ifdesired.
3.Aliquotintoappropriateamountaccordingtousageandstorethealiquotsat4°C.
CoatingplateswithMatrigel
Matrigel(Cat.no.354277,BD)shouldbealiquotedandstoredat-80°Cforlong-termuse.
1.Thawmatrigeloniceuntilliquid.Dilutematrigel1:50withpre-chilledKODMEM/F12.
2.Immediatelyusethedilutedmatrigelsolutiontocoattissueculture-treatedplates.Fora6-wellplate,use0.8mLofdilutedmatrigelsolutionperwell,andswirltheplatetospreadthematrigelsolutionevenlyacrossthesurface.
3.Letthecoatedplatestandfor1hat37°Corovernightat4°C.Ifplatehasbeenstoredat4°C,allowtheplatetoincubateat37°Cforatleast30minutesbeforeremovingthematrigelsolution.
ThawingcryopreservedhumaniPScells
1.QuicklythawthehumaniPScellsina37°Cwaterbathbygentlyshakingthecryovialcontinuouslyuntilhalfthawed.Removethecryovialfromthewaterbathandspraywith70%ethanoltosterilize.
2.Transferthecontentsofthecryovialtoa15mLconicaltube.Add5mLwarmmTeSR1dropwisetothetube,gentlymixingasthemediumisadded.
3.Centrifugecellsat200xgfor5minutesatroomtemperature.
4.Whilecentrifuging,removethematrigelsolutionfromacoatedtissueculture6-wellplate.Add1mLofwarmmTeSR1containing10µMROCKinhibitor(Y-27632)toonewellof6-wellplate.
5.Aftercentrifugation,aspiratethemediumfrom15mLtube.GentlyresUSPendthecellpelletin1mLmTeSR1with10µMROCKinhibitor,takingcaretomaintainthecellsassmallcellclumps.
6.Transferthemediumcontainingthecellclumpstothematrigelcoated6-wellplate.
7.Placetheplateintothe37°Cincubatorandmovetheplateinquicksidetoside,forwardtobackmotionstoevenlydistributetheclumpswithinthewells.Culturethecellsat37°C,with5%CO2and95%humidity.
8.Changemediumdaily.Checkforundifferentiatedcoloniesthatarereadytopassagewhencoloniesarebigenough(approximately7-10daysafterthawing).
PassaginghumaniPScellsgrownunderfeeder-freeconditions
1.Useamicroscopetoidentifyregionsofdifferentiation.Markthedifferentiatedcoloniesusinglensmarkeronthebottomoftheplate.
2.RemoveregionsofdifferentiationbyscrapingwithaPipettetiporbyaspiration.
3.AspiratemediumfromthehumaniPScellcultureandrinsewithDPBS(2mL/well).
4.Add0.5mLperwellofaccutase(Cat.no.SCR005,Millipore,diluted1:1withDPBSbeforeuse).Letitstandatroomtemperaturefor1minute.
5.Removeaccutase,andgentlyrinseeachwell2-3timeswith2mLofDMEM/F-12perwelltowashawayremainingenzymes.
6.Add2mL/wellmTeSR1andscrapecoloniesoffwithacellscraper.
7.Transferthedetachedcellaggregatestoa15mLconicaltubeandrinsethewellwithanadditional2mLmTeSR1tocollectanyremainingaggregates.Addtherinsetothe15mLtube.
8.Centrifugethe15mLtubecontainingtheaggregatesat200xgfor5minutesatroomtemperature.
9.Aspiratethesupernatant.ResuspendpelletinmTeSR1containing10µMROCKinhibitorbygentlypipettingandensurethatcellsaremaintainedasaggregates.
10.PlatethehumaniPScellaggregateswithmTeSR1ontoanewplatecoatedwithmatrigel.(Removematrigelsolutionbeforeplating).Ifthecoloniesareatanoptimaldensity,thecellscanbesplitevery5-7daysusing1:3to1:6ratio.
11.Placetheplateintothe37°Cincubatorandmovetheplateinquicksidetoside,forwardtobackmotionstoevenlydistributetheclumpswithinthewells.Culturethecellsat37°C,with5%CO2and95%humidity.
12.Changemediumdaily.
CryopreservinghumaniPScells
1.PrepareEZStemfreezingmedium(Cat.no.M050,ALSTEM)onice.
2.Performsteps1-8fromPassaginghumaniPScellsgrownunderfeeder-freeconditions
3.Gentlyaspiratethesupernatantandloosenthecellpelletbytappingthebottomofthetube.
4.Gentlyresuspendthepelletinfreezingmedium,takingcaretoleavetheclumpslargerthanwouldnormallybedoneforpassaging.
5.Transfer1mLofclumpsinfreezingmediumintoeachlabeledcryogenicvial.
6.Placevialsintoanisopropanolfreezingcontainerandplacethecontainerat-80°Covernight.
7.Transfertoaliquidnitrogentanknextday.