Sequence-specific inhibition of a transcription factor by circular dumbbell DNA oligonucleotides
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- 作者：Hosoya ; Takeshi ; Takeuchi ; Hiroaki ; Kanesaka ; Yoshiyuki ; Yamakawa ; Hidefumi ; Miyano-Kurosaki ; Naoko ; et. al.
- 关键词：DNA dumbbell ; Decoy ; Inhibition of transcription factor (NF-κ ; B) ; Jurkat cell ; Luciferase assay ; Anti-HIV
- 刊名：FEBS Letters
- 出版年：1999
- 出版时间：November 19, 1999
- 年：1999
- 卷：461
- 期：3
- 页码：136-140
- 全文大小：182 K
文摘
The inhibition of specific transcription regulatory proteins is a new approach to control gene expression. The transcriptional activities of DNA-binding proteins can be inhibited by the use of double-stranded oligonucleotides that compete for the binding to their specific target sequences in promoters and enhancers. We used nicked (NDODN-κB) and circular (CDODN-κB) dumbbell DNA oligonucleotides containing a NF-κB binding site to analyze the inhibition of the NF-κB-dependent activation of the human immunodeficiency virus type-1 (HIV-1) enhancer. The dumbbell DNA oligonucleotides are stable, short segments of double-stranded DNA with closed nucleotide loops on each end, which confer resistance to exonucleases. The dumbbell and other oligonucleotides (decoys) with the NF-κB sequence were found to compete with the native strand for NF-κB binding. The circular dumbbell and double-stranded phosphorothioate oligonucleotides competed with the native strand for binding to the NF-κB binding proteins, while the nicked NF-κB dumbbell was a less effective competitor. In Jurkat T-cells, the dumbbell and other oligonucleotides were tested for their ability to block the activation of the plasmid HIV-NL4-3 Luc. The CDODN-κB strongly inhibits the specific transcriptional regulatory proteins, as compared with the NDODN-κB and the double stranded phosphodiester oligonucleotides. On the other hand, the double stranded phosphorothioate oligonucleotides could also block this activation, but the effect was non-specific. The circular (CDODN) dumbbell oligonucleotides may efficiently compete for the binding of specific transcription factors within cells, thus providing anti-HIV-1 or other therapeutic effects.