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Freezing and Thawing cells
FreezingandThawingcells
Freezing
Itisbesttofreezecellsthataregrowingrapidly.Withadherentcells,itiseasiesttosetup100mmdishes,givethemfreshmediumthedaybeforeyoufreezethem,andfreezethemjustastheybecomeconfluent.IfyouareworkingwithsUSPensioncells,makesurethattheyaregrowingvigorouslybeforeyoufreezethem.1.Trypsinizethecellsifnecessary,andthenspinthemdown.Resuspendtheminonehalfthevolumethatyouwanttoendupwith.
Inotherwords,use0.5mlper100mmdishyouareusing.
ThecellsshouldberesuspendedinDMEMcontaining20%fetalcalfserum.Putthetubeinanicebucketandletthecellscool.
2.Now,addtheDMSOtothecellsslowly.ThisstepisaccomplishedbyaddingtotheresuspendedcellsanequalvolumeofDMEMcontaining20%fetalcalfserumand20%DMSO.
Thisshouldbedonedropwiseandthecellsuspensionshouldbemixedbyswirlingaftertheadditionofeachdrop.
ThereasontodothisslowlyistoavoidosmoticshockandtominimizetheheatingthatoccurswhenDMSOisaddedtowater.Whenyouarefinished,youshouldhavethecellssuspendedinDMEMcontaining20%fetalcalfserumand10%DMSOwithallthecellsfromasingle100mmdishin1ml.
3.Chillthecellsonice,inthecentrifugetube,forexactly30min.Thentransferthemtofreezingvialswhichhavebeenpre-chilledinthefreezerintheplasticrack,whichhasalsobeenpre-chilledinthefreezer.Use1mlpervial.4.Putthevialsinawellinsulatedboxthathasalsobeenpre-chilledinthefreezer.Insulationisbestaccomplishedwithcotton.Thenputtheboxinthe-70°Cfreezerovernight,forslowcooling,andthenputthemintoliquidnitrogen.Cellswillstoreforeverinliquidnitrogen.Storageat-70°Cisriskier.
Cellsshouldbethawedrapidlyandthendilutedslowlyintowarmgrowthmedium.
Thebestwaytodothisistotransferthecontentsofthethawedvialtoa50mlcentrifugetubeandthenadd--dropwise,withcontinualswirling--10mlofwarmmedium.
Thenputthecellsona100mldish.Thiswaythecellsdon"tsufferosmoticshock.
Somecellsseemtobenefitfrombeingdilutedintomedium,spundown,andthenresuspendedinwarmmedium.ThisgetsridoftheDMSO,butmaydisturbfragilecells.Ifthecellsareseededwithoutspinning,themediumshouldbechangedassoonasthecellshaveattached.
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