stabilize the RNA expression profile upon harvesting samples

[thiNGS]

Hi all. I am designing an experiment for RNAseq. I start treating my cells with a compound (or DMSO in the control) and collect samples at different timepoints. My question is: when I harvest the cells centrifuging for 10 minutes I am pretty sure the expression is going to slightly change and I would like to avoid that. I have read about using RNAprotect adding it directly to the culture but I have a feeling this reagent will just inhibit RNases to increase RNA stabilisation but it won't really "freeze" the expression profile at that particular timepoint. Any suggestions?
Thank you in advance

[kc3228]

Your best bet is probably to add trizol or similar directly to the plates and scrape the cells off, then extract RNA. Other than that, try to keep things cold.