Dual-targeting non-viral vector based on polyethylenimine improves gene transfer efficiency.

Area of Science:

• Biomaterials Science
• Gene Therapy
• Nanotechnology

Background:

• Polyethylenimine (PEI) is a common non-viral vector for gene transfer but has limited efficiency compared to viral vectors.
• Targeting specific cell surface receptors with ligands can enhance gene delivery efficiency.
• Viral infection pathways utilize multiple receptors, suggesting a potential for dual-targeting strategies in non-viral vectors.

Purpose of the Study:

• To synthesize and characterize a novel dual-receptor targeted non-viral vector by conjugating PEI with peptides recognizing FGF receptors (YC25) and integrins (CP9).
• To evaluate the physicochemical properties and in vitro/in vivo gene transfer efficiency of the dual-targeting vector compared to single-targeted and unmodified PEI.

Main Methods:

• Synthesis of a dual-targeting vector (YC25-PEI-CP9) by conjugating PEI with peptide YC25 (FGF receptor targeting) and peptide CP9 (integrin targeting).
• Characterization of physicochemical properties including pDNA complexation, particle size, zeta potential, and cytotoxicity.
• In vitro gene transfer assays in cell lines with varying expression of FGF receptors and integrins.
• In vivo gene transfer studies in tumor-bearing nude mice.

Main Results:

• The dual-targeting vector (YC25-PEI-CP9) exhibited similar physicochemical properties and lower toxicity compared to unmodified PEI.
• Significantly enhanced transgene efficiency was observed in vitro for YC25-PEI-CP9 in cells expressing both FGF receptors and integrins, outperforming single-peptide modified PEI and unmodified PEI.
• In cells with only integrin expression, YC25-PEI-CP9 showed improved efficiency over PEI but less than CP9-PEI.
• In vivo studies in tumor-bearing mice demonstrated significantly enhanced transfection efficiency in tumors expressing both target receptors.
• Free peptides competitively inhibited the gene transfer efficiency of the peptide-coupled PEI, confirming receptor-mediated targeting.

Conclusions:

• The novel dual-receptor targeted non-viral vector (YC25-PEI-CP9) effectively enhances gene transfer efficiency in vitro and in vivo.
• This dual-targeting strategy leverages the recognition of FGF receptors and integrins to improve non-viral gene delivery.
• The synthesized polymer shows significant promise as a next-generation non-viral vector for gene therapy applications.