Triplex forming oligonucleotide targeted to 3′UTR downregulates the expression of the bcl-2 proto-oncogene in HeLa cells
AUTOR(ES)
Shen, Changxian
FONTE
Oxford University Press
RESUMO
The bcl-2 proto-oncogene is overexpressed in a variety of human cancers and plays an important role in programmed cell death. Recent reports implied that the 3′-untranslated region (3′UTR) functions effectively in the regulation of gene expression. Here, we attempt to assay the ability of triplex forming oligonucleotides (TFOs) to inhibit expression of a target gene in vivo and to examine the potential of the 3′UTR of the bcl-2 proto-oncogene in the regulation of bcl-2 gene expression. To do this, we have developed a novel cellular system that involves transfection of a Doxycyclin inducible expression plasmid containing the bcl-2 ORF and the 3′UTR together with a TFO targeted to the 3′UTR of the bcl-2 proto-oncogene. Phosphorothioate-modified TFO targeted to the 3′UTR of the bcl-2 gene significantly downregulated the expression of the bcl-2 gene in HeLa cells as demonstrated by western blotting. Our results indicate that blocking the functions of the 3′UTR using the TFO can downregulate the expression of the targeted gene, and suggest that triplex strategy is a promising approach for oligonucleotide-based gene therapy. In addition, triplex-based sequence targeting may provide a useful tool for studying the regulation of gene expression.
ACESSO AO ARTIGO
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=30398Documentos Relacionados
- The heat shock response in HeLa cells is accompanied by elevated expression of the c-fos proto-oncogene.
- Expression of the yes proto-oncogene in cerebellar Purkinje cells.
- An African swine fever virus gene with similarity to the proto-oncogene bcl-2 and the Epstein-Barr virus gene BHRF1.
- Evaluation of biological activities of Physalis peruviana ethanol extracts and expression of Bcl-2 genes in HeLa cells
- Axotomized neonatal motoneurons overexpressing the bcl2 proto-oncogene retain functional electrophysiological properties.