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Underlay
1. Pipette 80 mL of stock solution media (see following page) into sterile 125 mL bottle.
Place in 48°C heating block in hood for 5-10 minutes.
2. Add 20 mL sterile 2.5% agarose (made up in ddH20 and autoclaved); mix by pipetting
up and down. Make sure agarose is not too hot. I usually let it sit for 5-10 minutes at
60°C after boiling.
3. Pipette agarose/media solution into 6-well plates, using 4 mL/plate. Make sure there are
no bubbles on surf ace of agar. Let harden. At this point, the plates can be wrapped and
stored at 4°C overnight until ready to use. Before use, place in 37°C C02 incubator for at least 1 hour.
Overlay
1 . Pipette 80 mL of stock solution into sterile 125 mL bottle. Place in heating block at
48°C.
2. Add 100 mL sterile H20 + 10 mL sterile 2.5% agarose and mix by pipetting up and
down.
3. To a sterile capped tube (not conical), add 2 mL agarose/media solution and desired
number of cells to plate. (Prepare cells by trypsin-treating the monolayer, pelletting cells,washing once with serum-free medium, and resuspending in medium supplemented with desired percentage of serum. Count cells and make appropriate dilutions to obtain the desired amount of cells in a volume no greater than 200 mL).
4. Vortex tube and quickly pour over underlay. Let harden, and incubate at 37°C, 5% CO2. |