A novel two-step transcriptional activation system for gene therapy directed toward epithelial cells.

Abstract:

:The two-step transcriptional activation (TSTA) mechanism in gene therapy amplifies cell type-specific promoter activity, allowing for increased levels of gene expression in target tissues. In this system, the specific promoter drives expression of a strong transcriptional activator that binds to DNA target sequences located upstream from a second promoter controlling the expression of the therapeutic gene. The majority of previous studies have exploited a fusion between the DNA binding domain of the yeast transcriptional activator Gal4 fused to the VP16 activation domain of herpes simplex virus 1 as the transcriptional activator. In this report, an alternative to this system is described based on a fusion protein containing the DNA binding domain of the bovine papillomavirus 1 transcriptional activator E2 fused to VP16 that induces target gene expression following binding to a minimal bovine papillomavirus 4 promoter containing upstream E2 binding sites and only 3 bp of promoter sequence upstream from the TATA box. VP16-E2 is superior to Gal4-VP16 as the transcriptional activator in a TSTA system driven by either of the two potentially cancer-specific promoters telomerase RNA and telomerase reverse transcriptase in several cell lines. Results also suggest that this new system has an advantage in epithelial cells and is therefore ideal for potential targeting of carcinomas. By incorporating the TRAIL gene as a transgene in the VP16-E2 TSTA system, selective killing of telomerase-positive cells occurs. We propose that our new system should be considered in future TSTA, particularly when targeting epithelial-derived cells.

journal_name

Mol Cancer Ther

authors

Arendt ML,Nasir L,Morgan IM

doi

10.1158/1535-7163.MCT-09-0543

subject

Has Abstract

pub_date

2009-12-01 00:00:00

pages

3244-54

issue

12

eissn

1535-7163

issn

1538-8514

pii

1535-7163.MCT-09-0543

journal_volume

8

pub_type

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