Imidazolyl-PEI modified nanoparticles for enhanced gene delivery

Area of Science:

• Biomaterials Science
• Nanotechnology
• Gene Delivery

Background:

• Polyethylenimine (PEI) is a widely used cationic polymer for gene delivery but suffers from high cytotoxicity.
• Modifications of PEI are explored to improve its gene delivery efficiency and reduce toxicity.
• Imidazolyl and hydrophobic moieties can alter the physicochemical properties and biological performance of PEI.

Purpose of the Study:

• To synthesize and characterize novel imidazolyl-PEI-PEG nanoparticles (IPP) and their hydrophobic derivatives (IPPL).
• To evaluate the DNA interaction, physicochemical properties, and in vitro performance of these nanoparticles.
• To assess the potential of IPP and IPPL as improved non-viral gene delivery vectors.

Main Methods:

• Synthesis of imidazolyl-PEI derivatives and their cross-linking with polyethylene glycol (PEG) to form IPP nanoparticles.
• Introduction of lauryl groups to create hydrophobic IPPL nanoparticles.
• Characterization of nanoparticles including DNA complexation, hydrodynamic diameter, zeta potential, cytotoxicity, and transfection efficiency in model cell lines.

Main Results:

• IPP and IPPL nanoparticles formed looser complexes with DNA, facilitating more efficient DNA unpackaging compared to native PEI.
• Imidazolyl substitution significantly enhanced gene delivery efficiency: 9-10 fold for PEI 750kDa and 3-4 fold for PEI 25kDa.
• IPPL nanoparticles demonstrated the highest reporter gene expression, and both IPP and IPPL exhibited negligible cytotoxicity.

Conclusions:

• Imidazolyl substitution and hydrophobic modification of PEI are effective strategies to enhance gene delivery efficacy.
• The developed IPP and IPPL nanoparticles represent a promising class of non-viral vectors with improved safety profiles.
• These modified nanoparticles hold potential for advancing gene therapy applications by overcoming limitations of traditional PEI.