Authors: Aditya Rayasam
Isolating and culturing dendritic cells
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J558 plasmacytoma cells = X63-Ag8 transfected with the cDNA of mouse GM-CSF(produced by PCR), cloned into the expression vector BCMGSNeo (Karasuyama et al., 1990, JEM 172, 969). These cells are DESCRIBED IN Zal et al., JEM 1994, 180:2089).
The cells are cultured in IMDM supplemented with glutamine / penicillin / streptomycin/ B mercapto (same DC), 5% FCS (same batch as the culture of DC). The selection medium to maintain the expression of GM-CSF contains 1mg/ml G418.
To make a large stock of ampoules of frozen cells: Expand cells in selection medium (they should never exceed 1.5 – 2×106) Wash 2x in medium without G418 Freeze at 5×10 ^ 6 / 90% FCS ampoule (same batch as the culture medium) -10% DMSO
To produce conditioned medium: Thaw a vial by washing in medium without G418 1x Inoculate a 175cm2 flask in 50 ml of medium with 5% FCS without G418 When there are enough cells (about 3 days), seed them into 500 ml of medium with 5%FCS without G418, with 2×10^5 cells / ml (in “spinner” of 500ml) 3 days later, collect the conditioned medium:
Centrifuge culture 5 min at 1300 rpm Filter the supernatant through 0.22 um
Re-seed cells at 2×10^5 cells / ml in approximately 3 L of medium with 5% FCS without G418 (we use a 3L spinner at this stage)
3 days later, collect the conditioned medium as above We can rebuild a 3-day conditioned medium with the cells recovered but not more (discard cells then)
The conditioned medium is kept at 4 C, maximum 4 months, and kept sterile For longer storage you can aliquot and freeze at -80C In ELISA, the concentration of GM-CSF should be more than 20ng/mL The filtration of the supernatant repeatedly can cause it to lose a part of its activity. Please do not filter more than once the supernatant obtained.
Complete Iscove’s Modified Eagle’s Medium (IMEM)
J558 DC protocool : DC protocol
Aditya Rayasam, Sandor Lab
Correspondence to: Aditya Rayasam ([email protected])
Source: Protocol Exchange (2015) doi:10.1038/protex.2015.024. Originally published online 17 March 2015.