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Cignal Finder Reporter Arrays (tube format)
Set up three polystyrene tubes, as follows:
Experimental transfections
Tubes 1 – 4:
100 µl Opti-MEM® + 4 μl (400 ng) Cignal reporter (4 volumes for
conditions 1 to 4 of Table 6; for every well dilute 1 μl (100 ng) of
Cignal reporter in 25 µl of Opti-MEM® serum-free culture medium)
Control transfections
Tubes 5-8:
100 µl Opti-MEM® + 4 μl (400 ng) Cignal negative control (4 volumes
for conditions 5 to 8 of Table 6; for every well dilute 1 μl (100 ng) of
Cignal reporter in 25 µl of Opti-MEM® serum-free culture medium)
Tube 9:
25 µl Opti-MEM® + 1μl (100 ng) Cignal positive control
Mix each transfection cocktail gently.
2. Prepare a SureFECT dilution for 9 tubes (mentioned in step 1) by dispensing 2.7 µl of
SureFECT into 225 µl of Opti-MEM® serum-free culture medium (for every well dilute 0.3
μl of SureFECT in 25 µl of Opti-MEM® serum-free culture medium) in a polystyrene test
tube. Mix gently and set the tube at room temperature for 5 minutes.
3. After the 5 minute incubation, add 100 µl of diluted SureFECT to the two tubes
(mentioned in step 1) containing equal volume (100 µl) of diluted Cignal reporter, and add
25 µl of diluted SureFECT into the positive control tube containing 25 µl of diluted
constructs (1:1 ratio) as detailed in Table 6.
4. Mix gently and incubate for 20 minutes at room temperature to allow complex formation
to occur.
5. Meanwhile, wash cells** in culture dish once with Dulbecco’s PBS without calcium and
magnesium, and treat with 1-3 ml trypsin-EDTA for 2-5 minutes at 37 ºC in a humidified
atmosphere containing 5% CO2. Suspend the cells in 7-9 ml of Opti-MEM® containing 5%
of fetal bovine serum, then centrifuge the cells down, remove the supernatant, and
resuspend the cells to 2 x 105 cells/ml in Opti-MEM® containing 5% of fetal bovine serum
and 1% NEAA***. To ensure reproducible transfection results, it is important to accurately
determine the cell density with a hemacytometer or an automated cytometry device.
6. After the 20 minute incubation for complex formation is completed, aliquot 50 µl of
specific complexes into the appropriate wells.
7. Add 100 µl of prepared cell suspension (2 x 105 cells/ml in Opti-MEM® containing 5% of
fetal bovine serum) to each well containing constructs-SureFECT complexes. This gives a
final volume of 150 µl. Mix gently by rocking the plate back and forth.
8. Incubate cells at 37°C in a 5% CO2 incubator for 16 hours.
9. After 16 hours of transfection, change medium to assay medium (Opti-MEM® containing
0.5% of fetal bovine serum, 1% NEAA, 100 U/ml Penicillin and 100 µg/ml Streptomycin).
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