title: Specific inhibition of human telomerase activity by transfection reagent, FuGENE6-antisense phosphorothioate oligonucleotide complex in HeLa cells.
abstract: Human telomerase might be associated with malignant tumor development and could be a highly selective target for antitumor drug design. Antisense phosphodiester (ODNs) and phosphorothioate (S-ODNs) oligonucleotides were investigated for their abilities to inhibit telomerase activity in the HeLa cell line. The ODNs and S-ODNs were designed to be complementary to nucleotides within the RNA active site of telomerase. As a transfection reagent, FuGENE6 was used to enhance the cellular uptake of oligonucleotides in cell cultures. The results showed that S-ODN-3 (19-mer) encapsulated with FuGENE6 clearly inhibited the telomerase activity in HeLa cells, and the inhibitory efficiency increased with an increase in the S-ODN-3. However, free S-ODN-3 showed no inhibitory activity. On the other hand, ODN-3 encapsulated with FuGENE6 had no detectable inhibitory activity. The encapsulated S-ODNs exhibited higher inhibitory activities than the free S-ODNs, and showed sequence specific inhibition. Thus, the activities of the S-ODNs were effectively enhanced by using the transfection reagent. The transfection reagent, FuGENE6, may thus be a potentially useful delivery vehicle for oligonucleotide-based therapeutics and transgenes, and is appropriate for use in vitro and in vivo.
authors.affiliation: Department of Industrial Chemistry, Chiba Institute of Technology, Narashino, Japan.
authors.forename: M
authors.initials: M
authors.lastname: Tao
authors.forename: N
authors.initials: N
authors.lastname: Miyano-Kurosaki
authors.forename: K
authors.initials: K
authors.lastname: Takai
authors.forename: H
authors.initials: H
authors.lastname: Takaku
mesh_terms: D004789:Enzyme Activation / Q000235:genetics; D015971:Gene Expression Regulation, Enzymologic; D006367:HeLa Cells; D006801:Humans; D007202:Indicators and Reagents; D008055:Lipids / Q000235:genetics*; D016376:Oligonucleotides, Antisense / Q000235:genetics*; D019098:Telomerase / Q000235:genetics* / Q000378:metabolism; D014162:Transfection
chemical_list: D007202:Indicators and Reagents; D008055:Lipids; D016376:Oligonucleotides, Antisense; D019098:Telomerase