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A high-efficiency translational control element with potential for cancer gene therapy
1Case Western Reserve University, Dermatology Department, Cleveland, OH 44106-5028, USA.
International Journal of Oncology
|May 16, 2002
Summary
A novel internal ribosome entry sequence (IRES) from NF-kappaB repressor mRNA (NFR183IRES) efficiently drives cap-independent translation for cancer gene therapy. This IRES enhances PTEN tumor suppressor expression, inhibiting carcinoma cell growth effectively.
Area of Science:
- Molecular Biology
- Cancer Research
- Gene Therapy
Background:
- Internal ribosome entry sequences (IRES) enable cap-independent translation, crucial for gene therapy applications.
- The NF-kappaB repressor mRNA (NFR) contains a potential IRES element with therapeutic promise.
Purpose of the Study:
- To characterize the translational activity of a specific region of the NF-kappaB repressor mRNA (NFR183IRES).
- To evaluate the efficacy of NFR183IRES for expressing the PTEN tumor suppressor in cancer gene therapy.
Main Methods:
- Utilized dicistronic constructs with the cytomegalovirus (CMV) promoter to express PTEN.
- Assessed IRES activity in vitro using human carcinoma cell lines (HeLa, LNCaP, MCF7).
- Compared NFR183IRES activity against a shorter NFR1IRES and viral IRES elements (EMCV, FMDV).
Main Results:
- NFR183IRES demonstrated significant cap-independent translation activity in human carcinoma cells.
- PTEN expression mediated by NFR183IRES led to more effective carcinoma cell growth inhibition than NFR1IRES.
- NFR183IRES exhibited superior translational activity compared to EMCV and FMDV IRES elements.
Conclusions:
- NFR183IRES is a highly efficient translational control element for cap-independent gene expression.
- This IRES holds significant potential for enhancing cancer gene therapy strategies through effective PTEN delivery.