Inhibition of the erbB-2 tyrosine kinase receptor in breast cancer cells by phosphoromonothioate and phosphorodithioate antisense oligonucleotides.

Published

Journal Article

Antisense activity against erbB-2 of a variety of sulfur-modified oligonucleotides was examined in a breast cancer cell line which overexpresses this oncogene. Using a 15 base anti-erbB-2 sequence previously shown to be effective, various backbone configurations containing phosphoromonothioate or phosphorodithioate linkages were evaluated for antisense activity by a two-color flow cytometric assay. This sequence was effective in inhibiting the production of erbB-2 protein when it was configured as a monothioate at each linkage and as an alternating dithioate/phosphodiester. Both of these compounds were also able to specifically inhibit erbB-2 mRNA expression, indicative of RNase H-mediated activity. The same sequence protected by either three dithioate or three monothioate linkages at each end was ineffective as an antisense reagent, suggesting that endonuclease activity is a significant determinant of the stability of oligonucleotides. Finally, the erbB-2 sequence target was shifted in an effort to improve antisense activity. A new lead sequence was identified that was significantly more effective in inhibiting erbB-2 protein levels and retained activity at lower concentrations.

Full Text

Duke Authors

Cited Authors

  • Vaughn, JP; Stekler, J; Demirdji, S; Mills, JK; Caruthers, MH; Iglehart, JD; Marks, JR

Published Date

  • November 1996

Published In

Volume / Issue

  • 24 / 22

Start / End Page

  • 4558 - 4564

PubMed ID

  • 8948649

Pubmed Central ID

  • 8948649

Electronic International Standard Serial Number (EISSN)

  • 1362-4962

International Standard Serial Number (ISSN)

  • 0305-1048

Digital Object Identifier (DOI)

  • 10.1093/nar/24.22.4558

Language

  • eng