Freezing HeK'n cells - (Jan/28/2005 )
How can I freezzing HeK'n cells? I don't have special medium and I can't find no additional informations . I'll be grateful for any ideas.
I know how to freeze HEK cells... don't know what HeK'n are!?!? If HeK'n are adherent cells, I guess the protocol is just the same:
Trypsinize the cells
Resuspend them in 'freezing buffer' at about 1 million cell/ml.
Freeze them slowly down to -80°C (put the vials between two styrofoam racks taped tight... this way they don't freeze too quickly).
The day after, put them in liquid nitrogen.
Freezing buffer : DMEM (or any medium I guess) + 20% FBS + 10% sterile DMSO. NO ANTIBIOTICS.
for a 15cm diameter plate :
i trypsinise cells, centrifuge them and add 2ml of a [SERUM / 10%DMSO]solution
Then i but cells in cryotubes. Cryotubes are putted in polystyrene racks taped tight and put overnight at -80°C. The second day i freeze them in nitrogen.
i prepare 9ml SERUM + 1ml sterile DMSO and store it for max 2weeks at 4°C
2ml are used for a 15cm diameter plate where cells are 80% confluent.
No less efficiency if the plate is full.
experiments done on hela cells, hek 293 and hek 293pack cells