Encapsulating Polyethyleneimine-DNA Nanoplexes into PEGylated Biodegradable Microparticles Increases Transgene...

Area of Science:

• Biomaterials Science
• Gene Therapy
• Nanotechnology

Background:

• Biocompatible polymeric microparticles offer improved gene transfection and reduced inflammation.
• Aerosolized delivery to the lungs is advantageous for applications like vaccinations.

Purpose of the Study:

• Investigate polymeric microparticles carrying the luciferase reporter gene for transfection efficiency.
• Evaluate the impact of PEGylation, porosity, and size on inflammatory responses in the lung.

Main Methods:

• Tested microparticle transfection in HEK293 and RAW264.7 cell lines.
• Determined optimal polyethylenimine (PEI) to DNA (N/P) ratio.
• Assessed cellular toxicity and inflammatory responses via intra-tracheal instillation in rats.

Main Results:

• Transfection efficiency has an optimal N/P ratio limit.
• Microparticles induced dose-dependent cellular toxicity.
• PEGylation increased transgene expression; non-porous particles reduced inflammation.
• Particle size influenced neutrophil recruitment in lungs.

Conclusions:

• PEGylation enhances gene delivery and release.
• Lack of porosity and optimal particle size are beneficial for reduced lung inflammation.
• Microparticle properties can be tuned for effective and safe gene delivery.