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Updated: May 4, 2026
High-Efficiency Transduction of Liver Cancer Cells by Recombinant Adeno-Associated Virus Serotype 3 Vectors
Published on: March 22, 2011
A novel gene expression system strongly enhances the anticancer effects of a REIC/Dkk-3-encoding adenoviral vector
Masami Watanabe1, Masakiyo Sakaguchi2, Rie Kinoshita3
1Center for Innovative Clinical Medicine, Okayama University Hospital, Okayama, Japan.
Abstract:
Gene expression systems with various promoters, including the cytomegalovirus (CMV) promoter, have been developed to increase the gene expression in a variety of normal and cancer cells. In particular, in the clinical trials of cancer gene therapy, a more efficient and robust gene expression system is required to achieve sufficient therapeutic outcomes. By inserting the triple translational enhancer sequences of human telomerase reverse transcriptase (hTERT), Simian virus 40 (SV40) and CMV downstream of the sequence of the BGH polyA, we were able to develop a novel gene expression system that significantly enhances the expression of the genes of interest. We termed this novel gene expression cassette the super gene expression (SGE) system, and herein verify the utility of the SGE cassette for a replication-deficient adenoviral vector. We newly developed an adenoviral vector expressing the tumor suppressor, reduced expression in immortalized cells (REIC)/Dickkopf-3 (Dkk-3), based on the CMV promoter-driven SGE system (Ad-SGE-REIC) and compared the therapeutic utility of Ad-SGE-REIC with that of the conventional adenoviral vectors (Ad-CMV-REIC or Ad-CAG-REIC). The results demonstrated that the CMV promoter-SGE system allows for more potent gene expression, and that the Ad-SGE-REIC is superior to conventional adenoviral systems in terms of the REIC protein expression and therapeutic effects. Since the SGE cassette can be applied for the expression of various therapeutic genes using various vector systems, we believe that this novel system will become an innovative tool in the field of gene expression and gene therapy.
Insights
A novel Super Gene Expression (SGE) system enhances gene expression significantly. This SGE system, when used in an adenoviral vector for cancer gene therapy, demonstrated superior therapeutic effects compared to conventional methods.
Area of Science:
- Molecular Biology
- Gene Therapy
- Biotechnology
Background:
- Efficient gene expression systems are crucial for effective cancer gene therapy.
- Existing systems like the cytomegalovirus (CMV) promoter require enhancement for robust therapeutic outcomes.
- The development of novel gene expression cassettes is essential for advancing gene therapy applications.
Purpose of the Study:
- To develop and validate a novel Super Gene Expression (SGE) system for enhanced gene delivery.
- To create an adenoviral vector (Ad-SGE-REIC) utilizing the SGE system for expressing the REIC/Dickkopf-3 tumor suppressor.
- To compare the therapeutic efficacy of the SGE-based adenoviral vector against conventional adenoviral vectors.
Main Methods:
- Constructed a novel gene expression cassette (SGE) by inserting translational enhancer sequences (hTERT, SV40, CMV) downstream of BGH polyA.
- Developed a replication-deficient adenoviral vector (Ad-SGE-REIC) driven by the CMV promoter-SGE system.
- Evaluated REIC/Dickkopf-3 protein expression and therapeutic effects of Ad-SGE-REIC compared to Ad-CMV-REIC and Ad-CAG-REIC in preclinical models.
Main Results:
- The CMV promoter-SGE system significantly enhanced gene expression compared to standard promoters.
- The Ad-SGE-REIC vector demonstrated superior REIC protein expression levels.
- Ad-SGE-REIC exhibited enhanced therapeutic effects in cancer models compared to conventional adenoviral vectors.
Conclusions:
- The Super Gene Expression (SGE) system offers a potent and robust method for enhancing gene expression.
- The Ad-SGE-REIC vector represents a promising advancement in adenoviral gene therapy for cancer.
- The SGE cassette has broad applicability for various therapeutic genes and vector systems, potentially revolutionizing gene expression and therapy.
