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Nanoparticles electrostatically coated with folic acid for effective gene therapy
Tomoaki Kurosaki1, Tamami Morishita, Yukinobu Kodama
1Department of Hospital Pharmacy, Nagasaki University Hospital, 1-7-1 Sakamoto, Nagasaki 852-8501, Japan.
Molecular Pharmaceutics
|May 12, 2011
Summary
Researchers developed novel folic acid (FA)-coated nanoparticles for gene therapy. These anionic nanoparticles reduced toxicity and enhanced gene delivery in FR-expressing melanoma cells and in vivo, showing promise for effective gene therapy applications.
Area of Science:
- Nanomedicine
- Gene Therapy
- Biotechnology
Background:
- Cationic poly(ethylenimine) (PEI)/pDNA complexes are widely used for gene delivery but exhibit significant cytotoxicity.
- Targeting strategies are crucial to enhance gene delivery efficiency and reduce off-target effects.
- Folic acid receptor (FR) is overexpressed on various cancer cells, making it a potential target for cancer therapy.
Purpose of the Study:
- To develop a novel, non-covalently modified vector for enhanced gene therapy.
- To investigate the targeting potential and efficacy of folic acid (FA)-coated PEI/pDNA nanoparticles.
- To evaluate the safety and in vivo performance of the developed nanocarrier system.
Main Methods:
- Electrostatically coating poly(ethylenimine) (PEI)/pDNA complexes with folic acid (FA) to form stable anionic nanoparticles (FA60/PEI/pDNA).
- Assessing nanoparticle characteristics, including charge ratio and stability.
- Evaluating cytotoxicity and transgene efficiency in FR-positive B16-F10 melanoma cells in vitro.
- Conducting in vivo studies in mice to assess biodistribution and gene expression in various organs after intravenous injection.
- Investigating the FR-mediated pathway by pre-administering FA to inhibit gene expression.
Main Results:
- Stable anionic FA60/PEI/pDNA nanoparticles were formed at a charge ratio > 60 without covalent binding.
- FA coating significantly reduced the cytotoxicity of PEI/pDNA complexes in B16-F10 cells.
- High transgene efficiency was achieved in B16-F10 cells via the FR-mediated pathway.
- The FA60/PEI/pDNA complexes did not cause erythrocyte agglutination, indicating good hemocompatibility.
- In vivo studies showed higher transgene efficiency in the liver, kidney, spleen, and lung compared to unmodified PEI/pDNA complexes.
- Gene expression was significantly inhibited by pre-administering FA, confirming FR-mediated targeting.
Conclusions:
- The developed anionic FA60/PEI/pDNA nanoparticles offer a promising non-covalent strategy for targeted gene delivery.
- This novel vector system demonstrates reduced cytotoxicity and enhanced gene therapy efficacy through FR-mediated targeting.
- The findings support the potential utility of FA60/PEI/pDNA complexes for effective and safer gene therapy applications.
