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Multiporator Transfection Protocol Protocol No. 4308 915.042 11/2001 Cell line B16, mouse melanoma cells Transfection with Plasmid pEGFP-N1 (in bidistilled H2O) Electroporation buffer Eppendorf Hypoosmolar Electroporation Buffer (PH) Culture medium DMEM / 10% FCS Cuvette Eppendorf, 2 mm gap width, 400 l Temperature RT (20-25 C) Reference Dr. Kirsten Falk and Dr. Olaf Rtzschke Cellular Immunology
Max Delbrck Center for Molecular Medicine Robert-Rssle-Strasse 10 D-13125 Berlin-Buch
  1. Harvest the cells in the exponential growth phase with 0.05% trypsin-EDTA for 1 min, stop by adding DMEM and centrifuge them (for 5 minutes, 200 x g, at room temperature).
  2. Resuspend the cells in DMEM / 0.5% FCS, determine the number of cells and centrifuge them (for 5 minutes, 200 x g, at room temperature). Remove supernatant.
  3. Resuspend the cells in medium, set the cell number to 1 x 106 cells/ml and centrifuge them (for 5 minutes, 200 x g, at room temperature). Remove supernatant.

    Note: The overall incubation time in the Eppendorf Electroporation Buffer must not exceed 30 minutes to guar antee a successful electroporation!

  4. Resuspend the cells in Hypoosmolar Electroporation Buffer. Add and mix plasmid DNA (20 g/ml final concentration, in bidistilled H2O).
  5. Transfer 400 l cell suspension into electroporation cuvettes (2 mm gap width). The cell suspension must be free of air bubbles.
  6. Electroporation:

    Mode Eukaryotes Voltage (V) 400 V Time constant (T) 100 s No. of pulses (n) 1
  7. After the pulse, allow the cell suspension to stand in the cuvette for 15 minutes at room temperature.
  8. Carefully transfer the cell suspension with a pasteur pipette from the cuvette into 3 ml DMEM /10% FCS, and cultivate them in a 55 mm culture dish.
Detection methods for transfection:
The expression of the plasmid pEGFP-N1 by viable B16 cells can be detected after 24-48 hours with a flow cytometer by costaining with propidium iodide (final concentration 1 g/ml). Incubate for 10 min. at RT. Result: Survival rate: 68.91% Transfection rate: 78.21% based on the number of surviving cells. Results were measured 24 hours after transfection.



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