A biodegradable poly(ester amine) based on polycaprolactone and polyethylenimine as a gene carrier

Area of Science:

• Biomaterials Science
• Gene Therapy
• Nanotechnology

Background:

• Non-viral gene delivery systems are crucial for therapeutic applications.
• Plasmid DNA (pDNA) requires efficient and safe delivery vectors.
• Biodegradable polymers offer potential advantages over conventional vectors like polyethylenimine (PEI).

Purpose of the Study:

• To synthesize and optimize biodegradable poly(ester amine)s (PEAs) for plasmid DNA (pDNA) delivery.
• To evaluate PEAs as non-viral vectors for gene therapy applications.
• To compare the efficacy and safety of PEAs against PEI 25K.

Main Methods:

• Poly(ester amine)s (PEAs) synthesized via Michael addition reaction between polycaprolactone (PCL) diacrylate and polyethylenimine (PEI).
• Characterization of PEA/DNA complexes for size and stability.
• In vitro cytotoxicity and transfection efficiency assays in 293T, HepG2, and HeLa cell lines.
• In vivo transfection studies using aerosol administration.

Main Results:

• PEA/DNA complexes exhibited stable condensation with particle sizes below 200nm.
• PEAs demonstrated controlled degradation and significantly lower cytotoxicity compared to PEI 25K.
• PEAs achieved substantially higher transfection efficiencies (up to 15-25 fold increase) in vitro and in vivo.
• The PCL/PEI-1.2 complex showed the highest reporter gene expression.

Conclusions:

• Developed PEAs are effective and safe polymeric vectors for non-viral gene therapy.
• PEAs offer a versatile platform with tunable properties for improved gene delivery.
• These novel vectors show significant potential for both in vitro and in vivo applications, outperforming PEI 25K.