my lab uses PEI for transfection. we have optimised dosage for generating viral media from HEK cells (about 95% transfection efficieny) to transduce other cell lines. It does work very well but for some other cell lines like RPE, MDCK the efficiency was poor and quite toxic.
Hi Zheng, you might also want to consider another method and the one I recommend for enthothelial cells is Magnetofection, http://www.ozbiosciences.com/content/13-magnetofection
for DNA I suggest PolyMag & PolyMag Neo and for siRNA silenceMag you can see in the citations database all published papers especially on HUVEC. If you have any question please do not hesitate to contact us at [email protected]