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The emerging fields of suicide gene therapy and virotherapy
David Kirn1, Ion Niculescu-Duvaz, Gunnel Hallden
1Viral and Genetic Therapy Programme, Imperial College School of Medicine, Hammersmith Hospital, DuCane Road, London, UK W12 0NN.
Abstract:
Gene therapy is defined as a technology aimed at modifying the genetic component of cells for therapeutic benefit. 'Suicide genes' can be introduced into cancer cells to make them more sensitive to chemotherapeutics or toxins. Chemotherapeutic suicide gene therapy approaches are known as gene-directed enzyme prodrug therapy or gene-prodrug activation therapy. Other approaches include replacement gene therapy, antisense strategies and induction of resistance to normal cells. All gene therapy strategies share a common component, which is the need for a selective delivery vehicle or vector with tumor-targeting capabilities. This need has led to the in-depth investigation of viruses as new vectors for gene therapy.
Insights
Gene therapy modifies cell genetics for treatment. Suicide gene therapy enhances cancer cell sensitivity to drugs, requiring targeted delivery vectors like viruses.
Area of Science:
- Oncology
- Molecular Biology
- Biotechnology
Background:
- Gene therapy offers novel therapeutic strategies by altering cellular genetic material.
- Cancer treatment faces challenges in selectively targeting malignant cells while sparing healthy ones.
- Suicide gene therapy is a promising approach to enhance cancer cell susceptibility to cytotoxic agents.
Purpose of the Study:
- To explore the principles and diverse strategies of gene therapy in cancer treatment.
- To highlight the critical role of selective delivery vectors in gene therapy efficacy.
- To discuss the potential of viral vectors for targeted gene delivery in oncology.
Main Methods:
- Introduction of 'suicide genes' into cancer cells to increase sensitivity to toxins.
- Implementation of gene-directed enzyme prodrug therapy and gene-prodrug activation therapy.
- Investigation of alternative strategies such as replacement gene therapy and antisense approaches.
Main Results:
- Suicide gene introduction can sensitize cancer cells to chemotherapeutics and toxins.
- Gene therapy approaches require efficient and tumor-specific delivery vehicles.
- Viruses are being extensively studied as potential vectors for cancer gene therapy.
Conclusions:
- Gene therapy presents a versatile platform for cancer treatment with various strategic modalities.
- The development of effective tumor-targeting vectors is paramount for successful gene therapy.
- Viral vectors show significant promise for advancing targeted cancer gene therapy applications.