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Transfection procedures are highly dependent on the cell type and plasmid being used. Below are some alternative methods people have had success with in the past.
Alternative Method 1
- Person
- Zeinab Al-Rekabi
- Cell Line
- C2C12 Rat Myoblast
- Plasmids which work well
- Zyxin-RFP
- Plasmids which do not work well
- Vinculin-GFP
- The day before transfections, I seed my cells to 90-100% confluency in 100cm plate.
- Next day
- Follow the same protocol as Invitrogen
- split cells
- Use a dilution of 1:4 (works best in my case)
- Instead of adding optimem and incubating for 4-6hrs, I simply add the growth media and I find better and much stronger expression than using optimem.
- 24 hours after transfection, change media check with fluorescence
- 48 hours after transfection, check under fluorescence and I generally get better expression and from there further experiments and imaging as AFM/confocal, AFM/EPI, or staining can be done.
Alternative Method 2
- Person
- Tina Haase
- Cell Line
- HeLa and MDCK
- Plasmids which work well
- PLC-δ
- One day prior to doing transfections, I split my cells normally (~70% confluency in 100cm plate) and add ~50µl (from pellet re-suspended in 2 ml of media) to each of my 35 ml glass dishes.
- The following day
- Use the Invitrogen protocol (but skip the step where you split with Optimem)
- Use dilution of 1:2 (so 2µl of LF2K in 48µl of Optimem)
- Usually I get a concentration between 300-500 µg/ml of PLC-δ plasmid DNA, which corresponds to ~3µl in 47µl Optimum, or ~2µl in 48µl Optimem, respectively
- After combining the LF2K/DNA/Optimem (your 100µl solution) let it sit for at least 10 minutes, and discard the normal media from your 35 ml dishes and add ~1ml of Optimem
- There is no need to wait the extra hour, just add your DNA to the dishes and incubate for 4-5 hours. I have tried skipping the 4-6 hour incubation period and although you do get some fluorescing cells, not nearly as many as when you have some patience…which will give you upwards of 50% of your dish fluorescing!
- Add excess media (I try to squeeze in 2 ml) following the 4-6 hour incubation period.
- Change the media the following day. Expression is already really good on the first day!
- 48 hours after doing transfections the cells are usually still glowing brightly and should be a complete monolayer (actually I had them fluoresce up to 5 days later…but you will have a lot of cells…way more than necessary)
Alternative Method 3
- Person
- Pato Kunda
- Cell Line
- HeLa and RPE1
- Plasmids which work well
- none in particular; it describes a general procedure of transfection with Fugene
- Day 1: Plate cells the day before, so they will be at around 80% confluency
- Day 2: Change media with PenStrep free DMEM
- In a 1.5 ml microcentrifuge tube, make up plasmid DNA solution in optiMEM (see table below)
- Add appropriate volume of Fugene (see table below)
- Incubate at room temperature for 20 minutes
- Pipette solution over the cells and return to 37 deg.
- Day 4: transient transfection will be at maximum
HeLa cells
Use 3:1 ratio for large volumes; 6:1 for smaller volumes (μL Fugene:μL plasmid)
|
Total vol. |
Vol. OptiMEM |
Amount DNA |
Vol. Fugene
|
10cm plate
|
10ml |
500μl |
10μg |
30μl
|
12-well plate
|
1ml |
50μl |
500ng |
1.5μl
|
4-well chamber slide
|
500μl |
10μl |
200ng |
1.2μl (6:1)
|
8-well chamber slide
|
100μl |
5μl |
100ng |
0.6μl (6:1)
|
RPE1 cells (retinal pigment epithelial)
- Use 6:1 ratio for large volumes; 6:1 for smaller volumes (μl Fugene:μl plasmid)
- Use DMEM/F12
|
Total vol. |
Vol. OptiMEM |
Amount DNA |
Vol. Fugene
|
10cm plate
|
10ml |
500μl |
10μg |
60μl
|
12-well plate
|
1ml |
50μl |
500ng |
3μl
|
4-well chamber slide
|
500μl |
10μl |
200ng |
1.2μl
|
8-well chamber slide
|
100μl |
5μl |
100ng |
0.6μl
|
|