Combining polyethylenimine and Fe(III) for mediating pDNA transfection

Area of Science:

• Biomaterials Science
• Gene Therapy
• Nanotechnology

Background:

• The biomedical potential of Fe(III) ions suggests their utility in combination with pDNA-PEI polyplexes.
• Investigating the impact of Fe(III) on pDNA complex properties is crucial for advancing gene delivery systems.

Purpose of the Study:

• To assess the effect of Fe(III) ions on the properties of pDNA-PEI polyplexes.
• To evaluate the influence of Fe(III) on gene transfection efficiency and cytotoxicity.

Main Methods:

• Complex formation was studied using varying buffer and salt conditions.
• pDNA incorporation was analyzed via gel electrophoresis and dynamic light scattering.
• Transfection efficiency and cytotoxicity were assessed in HeLa and HUH-7 cell lines using flow cytometry.

Main Results:

• Fe(III) consistently enhanced pDNA incorporation into complexes.
• Transfection efficiency varied with salt concentration; high salt increased it up to 5-fold.
• Fe(III) at low salt inhibited endosomal escape, while at intermediate salt, it reduced complex size without compromising transfection.

Conclusions:

• Fe(III) acts as a beneficial condensing agent for pDNA-PEI complexes, modulating properties like size and cytotoxicity.
• Incorporating Fe(III) offers advantages for gene delivery systems, impacting pDNA transfection mechanisms.