title: Antisense properties of end-modified oligonucleotides targeted to Ha-ras oncogene.
abstract: Phosphodiester oligodeoxyribonucleotides linked to an intercalating agent or a dodecanol tail or both complementary to the 12th codon region of Ha-ras mRNA were compared with the unmodified oligonucleotides of the same size and sequence with respect to their ability to induce RNaseH cleavage and antisense activity in cell culture. The hydrophobic tail not only protected the oligonucleotide from nucleases but also enhanced RNase H cleavage of the target. Oligonucleotides carrying both an acridine and a dodecanol substituent inhibited the proliferation of HBL100ras1 cells (human mammary cells stably transformed with the T24 Ha-ras gene carrying a G-->T point mutation in codon 12) at a 20-fold to 30-fold lower concentration than unmodified ones. Therefore, these modified oligonucleotides may prove useful for antisense applications.
authors.affiliation: Laboratoire de Biophysique, INSERM U.201, CNRS URA 481, Paris, France.
authors.forename: T E
authors.initials: TE
authors.lastname: Saison-Behmoaras
authors.forename: I
authors.initials: I
authors.lastname: Duroux
authors.forename: T T
authors.initials: TT
authors.lastname: Nguyen
authors.forename: U
authors.initials: U
authors.lastname: Asseline
authors.forename: C
authors.initials: C
authors.lastname: Hélène
mesh_terms: D001483:Base Sequence; D001940:Breast; D002455:Cell Division / Q000187:drug effects; D002461:Cell Line, Transformed; D003062:Codon; D007851:Dodecanol; D005260:Female; D011905:Genes, ras; D006801:Humans; D007364:Intercalating Agents; D007700:Kinetics; D016376:Oligonucleotides, Antisense / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology*; D017354:Point Mutation; D016133:Polymerase Chain Reaction; D012333:RNA, Messenger / Q000096:biosynthesis; D016914:Ribonuclease H; D014158:Transcription, Genetic / Q000187:drug effects*; D014162:Transfection; D014407:Tumor Cells, Cultured; D001749:Urinary Bladder Neoplasms
chemical_list: D003062:Codon; D007364:Intercalating Agents; D016376:Oligonucleotides, Antisense; D012333:RNA, Messenger; D007851:Dodecanol; D016914:Ribonuclease H