Protocol No. 4308 915.022 11/1999
COS-7, monkey, kidney
Plasmid RSV/lacZ (in bidistilled H2
Eppendorf Hypoosmolar Electroporation Buffer (PH)
DMEM / 10% FCS
Eppendorf, 2 mm gap width, 400 l
Dr. Helena Edlund Department of Microbiology
University of Umea Umea Sweden
Phone +46 90 7856701 Fax +46 90 772630 e-mail: Helena.Edlund@micro.umu.se
Detection methods for transfection:
- Harvest the cells in the exponential growth phase and centrifuge
them (for 5-10 minutes, 200 x g, at 4 C).
- Resuspend the cells in DMEM / 0.5% FCS, determine the number of cells
and centrifuge them (for 5-10 minutes, 200 x g, at 4 C). Remove supernatant.
Note: The overall incubation time in the Eppendorf Electroporation
Buffer must not exceed 30 minutes to guarantee a successful electroporation!
- Resuspend the cells in Hypoosmolar Electroporation Buffer. When doing
so, set the cell concentration to 1 x 106 cells/ml.
- Add and mix plasmid DNA (5 g/ml final concentration, in bidistilled
- Transfer 400 l cell suspension into electroporation cuvettes (2 mm
gap width). The cell suspension must be free of air bubbles.
Time constant (T)
No. of pulses (n)
- After the pulse, allow the cell suspension to stand in the cuvette
for 5 minutes on ice.
- Carefully transfer the cell suspension from the cuvette to 3-5 ml DMEM / 10% FCS, and cultivate them in a 55 mm
The expression of the plasmid RSV/lacZ can be detected after 48 hours
30-40% based on the initial number of cells used for
Results were measured 48 hours after transfection.
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