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Strategies for cancer gene-delivery improvement by non-viral vectors
María L Santana-Armas1, C Tros de Ilarduya1
1Department of Pharmaceutical Technology and Chemistry, School of Pharmacy and Nutrition, University of Navarra, 31080 Pamplona, Spain.
Abstract:
Lack of selectivity together with severe side effects in conventional cancer treatment have afforded the development of new strategies based on gene therapy. Nowadays, gene therapy is employed through both viral and non-viral vectors. In spite of the high transfection activity of viral vectors, some drawbacks have pointed out to non-viral vectors as a safer alternative. To overcome low efficiency as well as other issues associated with the use of non-viral vectors, complexes formed by lipids and polymers with DNA, named lipoplexes and polyplexes respectively, have been modified in order to improve its features. Suitability of cancer gene therapy also requires the capacity to distinguish between normal and tumoral cells. This requirement has been solved by the addition of specific ligands that enable receptor binding and subsequent endocytosis. In this article we review the most recent approaches in structure modification of non-viral vectors through different methods comprising conjugation, addition of helper lipids or changes in design and synthesis as well as the strategy based on exploiting receptors that are usually overexpressed in malignancies. Such improvements confer specificity, efficient gene delivery, condensation, protection of DNA and low levels of toxicity avoiding off-target effects which turn into a potential tool to treat cancer.
Insights
Gene therapy offers a safer cancer treatment alternative to conventional methods. Modified non-viral vectors, enhanced with ligands, improve gene delivery specificity and reduce toxicity for effective cancer treatment.
Area of Science:
- Biomedical Engineering
- Molecular Biology
- Oncology
Background:
- Conventional cancer treatments often lack selectivity and cause severe side effects.
- Gene therapy presents a promising alternative, utilizing viral and non-viral vectors for targeted treatment.
- Non-viral vectors are explored as a safer option compared to viral vectors, despite initial efficiency challenges.
Purpose of the Study:
- To review recent advancements in modifying non-viral vectors for enhanced cancer gene therapy.
- To explore strategies for improving the specificity and efficiency of non-viral gene delivery systems.
- To highlight the potential of modified non-viral vectors in overcoming limitations of current cancer treatments.
Main Methods:
- Modification of non-viral vectors (lipoplexes and polyplexes) through conjugation and design changes.
- Incorporation of specific ligands to target receptors overexpressed in cancer cells.
- Evaluation of vector modifications for improved DNA condensation, protection, and reduced toxicity.
Main Results:
- Modified non-viral vectors demonstrate enhanced specificity through receptor-mediated targeting.
- Improvements in vector design lead to more efficient and safer gene delivery.
- Strategies discussed aim to overcome low efficiency and off-target effects associated with non-viral vectors.
Conclusions:
- Structural modifications and ligand conjugation significantly enhance non-viral vector performance for cancer gene therapy.
- Targeted delivery via receptor-ligand interactions improves therapeutic efficacy and minimizes side effects.
- Optimized non-viral vectors represent a potent strategy for developing safer and more effective cancer treatments.
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