[BioC] OT: cell lines and tissues

Stefano Calza stecalza at tiscali.it
Wed Jul 7 14:02:01 CEST 2004

Hi Rohit,

this was my point. But their (and mine at the statistical analysis step)  problem is that from the normal tissue itself they cannot collect enough RNA. Then, what could be the best (or least bad) 
Microdissection would bring into the normal sample a mixture of cells, not only epithelial ones. Amplifying RNA from the normal tissue (they already have the chips for th patholigical ones) would 
probably bias the expression, though I guess the overall expression (or also differentially at gene level?).

Summarizing: what could be the best procedure?


On Tue, Jul 06, 2004 at 08:18:13PM +0200, Ghai, Rohit wrote:
> hi Stefan
> I feel that such comparisons would not offer as much contrast 
> and clarity. Normal tissues would be best, even if isolation
> is tedious. Cell lines grow in a completely different environment
> than tissues. Gene expression is critically dependent on outside
> cues from other cells in the tissue too. Of course, this also depends on
> what is the question you are asking. If its a question of identifying
> markers, these may be identified as one can then verify individual markers
> on a smaller scale. But for a better distinction of the processes underlying
> the disease state it would be better to use normal ovarian epithelium.
> regards
> Rohit 
>  ------------------------------------------------------------------
> Hi everybody. 
> This is definitely Off-Topic, but I'd like to have an opinion from the many
> biologist (but not only!) that populate the list, about the following
> problem:
> A group of biologists is willing to study gene expression in ovarian cancer
> tissues relative to normal ones. As the normal ovarian epithelium is single
> layer, it's quite hard to get enough RNA. So 
> they are actually going to compare normal ovarian cell lines grown in vitro
> versus patological tissues. I feel a bit confused about this. Wouldn't be
> better to amplify the RNA from normal 
> tissues? Any other options? 
> Any insight will be very appreciated. 
> TIA, 
> Stefano
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