The cytotoxicity of anti-PAI-5 hexadecanucleotides (phosphodiesters and pho
sphorothioates) and their conjugates with lipophilic alcohols was tested in
EA.hy 926 hybrid endothelial cells. Some cytotoxicity was found for choles
teryl and bornyl conjugates at concentrations higher than those used for an
tisense inhibition experiments.