# seeding of cells for transfection - (Mar/14/2005 )

is my protocol wrong or right?

1. dilute your cells to give 13ml cell suspension containing 130000cells/ml.

2. add 2ml medium to each well in two 6-well plates.

3. seed out 1.3x10^5 cells in each well of the 6-well plates.

if each well should have 1.3x10^5 cells, then why should i add 2ml medium in it, since the cells would be diluted. is step 2 wrong or right?

thank you.

-seasons-

If you diluted concentration is 1.3x10^5, and add 2 ml into each well, then there will be 2.6x10^5 cells/well. You need add another 13 ml medium to the dilution, and then 2ml will give you exact 1.3x10^5 cells/well.

I think step 2 means adding the diluted cells to the plate and step 3 just explains what you did in step 2.

-pcrman-

hi
i think that in step 2 you add a cell free medium
and in step 3 you seed your cells
the final volume in each well is 3ml and that is ok
The step 2 ensure a good repartition of you cells when you seed the plate.

But if 2ml/well is ok for your cells, pcrman is right.

-fred_33-

QUOTE (fred_33 @ Mar 15 2005, 04:03 AM)
hi
i think that in step 2 you add a cell free medium
and in step 3 you seed your cells
the final volume in each well is 3ml and that is ok
The step 2 ensure a good repartition of you cells when you seed the plate.

But if 2ml/well is ok for your cells, pcrman is right.

So you meant that in step 3 i add 1 ml of my cell suspension with 130000cells/ml. When i add this 1ml, the cell concentration won't be 130000cells/ml. since i already have 2ml of cell free medium. How many cells do you usually have in each well?

-seasons-

hi
the number of cells won't change if you further add 2ml of cell free medium and that's the important point.
for note, i usually seed 150 000 to 300 000 cells in a 6 well-plate.

-fred_33-