Drug vehicle giving toxicity in cell culture - With increse in vehicle..... toxicity decrese (Mar/08/2011 )

Hi all,

greeting of the day,

I am stuck with one experment. My drug vehicle is showing toxicity (About 50 %)and i am not able figure out the reason behind this.

Acc. to protocol i prepare the drug in this way,(vehicle and drug prepared in the same way)

Drug----->dissolved in HFIP(Solvent)-----> HFIP is evaporated in Fume hood for 24 h-----

>then stock (5mM) is prepared by DMSO------> futher 100 uM is prepared by PBS.


Now this is used for MTT done on HT-22 cells (Hippocampal neuron).

I used 3 conc-->2uMm, 5uM and 10uM. There is increase in toxicity in 2uM and 5uM. And to my surprize, in 10uM vehicle the viability has incresed in comparison to 2uM which seems to be quite impossible. i am worried and tense and not able to figure out the reason behind.

I just wanted to know from the people here that has similar happened withanyone.

Any kind of advice or views will be highly appreciated.

Thanx in advance

scifistudent on Tue Mar 8 12:08:43 2011 said:

Could it be that you performed the dilution wrongly or mis-labelled your tubes?

it could be your DMSO i found if i used old DMSO (bottle opened a few months) as a vehicle it killed cells much more than newly purchased DMSO.
if you can use distilled water or biochemistry grade ethanol as vehicle i found this gave better results and both were largely non toxic on cell lines i used

Thank you friends for your replies,

But there is no problem with DMSO as i have opened the new the stock.

I would like to discuss and also want to share their experience with the researchers who are working on amyloid beta oligomers.

thanx