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Multiporator Transfection Protocol Protocol No. 4308 915.020 11/1999 Cell line Jurkat, T-lymphocyte, human leukemia (suspension cell line) Transfection with Plasmid pEGFP-N1 (in bidistilled H2O) Electroporation buffer Eppendorf Hypoosmolar Electroporation Buffer (PH) Culture medium RPMI 1640 / 10% FCS Cuvette Eppendorf, 2 mm gap width, 400 l Temperature RT (20-25 C) Reference Prof. Ulrich Zimmermann Lehrstuhl fr Biotechnologie Biozentrum Universitt Wrzburg
Am Hubland D-97074 Wrzburg Phone +49 931 888 4508 Fax +49 931 888 4509
  1. Harvest the cells in the exponential growth phase and centrifuge them (for 5-10 minutes, 200 x g, at room temperature).
  2. Resuspend the cells in RPMI 1640 / 0.5% FCS, determine the number of cells and centrifuge them (for 5-10 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 guarantee a successful electroporation!

  3. Resuspend the cells in Hypoosmolar Electroporation Bu ffer. When doing so, set the cell concentration to 1 x 106 cells/ml.
  4. Add and mix plasmid DNA (5-20 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) 240 V Time constant (T) 40 s No. of pulses (n) 1
  7. After the pulse, allow the cell suspension to stand in the cuvette for 5-10 minutes at room temperature.
  8. Carefully transfer the cell suspension from the cuvette to 5 ml RPMI 1640 / 10% FCS, and cultivate it in a 60 mm culture dish.
    Note: After pulsing, the cells should be incubated for 2-3 h at 37 C before any centrifugation is performed, to ensure resealing of the membrane.
Detection methods for transfection:
The expression of the plasmid pEGFP-N1 can be detected clearly after 24-48 hours with the aid of FACS analysis or under a fluorescence microscope. Result: Survival rate: 85% Transfection rate: 67% based on the number of surviving cells
57% based on the initial number of cells used for the experiment Results were measured 24 hours after transfection.



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