Different siRNA transfection agents - Have enyone tested them??? (Dec/16/2004 )
Has anyone tested different transfection reagents for transfection siRNA, like X-tremeGENE or RNAiFect?? Is there a big difference compared to normal transfection reagents eg FuGene??
I am goin to transfect my epiphelial cells in january and would like to test only the best reagents to save money and time.
Yes, before you start your RNAi experiments, find a good transfection reagent and stick to it. I have used such reagent from ambion and invitrogen and have not compared side by side the effect. But the protocol for Invitrogen's lipofectamin 2000 seems much simpler and that is why I later have only used it for all my transfections.
Tom tuschl has some good comments on different transfection reagents:
What about other transfection reagents? There are amazing differences in the efficiency of the cationic liposome reagents available on the market. Old, classical reagents are normally bad and only kept in the program of manufacturers to satisfy "conservative" customers, e.g. Lipofectamine 2000 is about 10 times more efficient than the still distributed Lipofectamine. We are just testing different transfection reagents.
To read more, click here http://www.rockefeller.edu/labheads/tuschl/sirna.html
Open Biosystems has a transfection reagent called Arrestin that is comparable to Lipofectamine but cheaper. I have not tested it but have heard good efficiencies from others in the lab.
We and others have good experiences on Epoch Biolabs' GenCarrier-1/2 reagents. They are basically similar to Lipofectamine2000 (efficiency and protocol) but much cheaper. In some primary cells, it even outperforms Lipofectamine2000.
I've just tested two reagents from Ambion (siPORT Lipid and SiPORT Amine) side by side with Lipofectamine 2000. In my cells (a mouse beta-cell line) I got high levels of transfection using siPORT Amine (>80% cells transfected), but the results with the two lipidic reagents were dismal (approx 25% cells transfected). Other people in my lab gets 90% transfection levels with lipofectamine 2000 in fibroblasts cell lines. It all depends on the cell line. As pcrman said, best thing to do is test several reagents at the beginning of your experiment and stick with the best.
since you're using epithelial cells I'd recommend NeoPhectin which we sell, that is very good for difficult to transfect cell types such as endothelial and primary cells. Find more information at http://www.expresson.com/productsandservices/neophectin.html
you may look at
hope that helps