Incorporation of active DNA/cationic polymer polyplexes into hydrogel scaffolds.

Area of Science:

• Biomaterials Science
• Gene Therapy
• Nanotechnology

Background:

• Hydrogel scaffolds are promising for localized gene and siRNA delivery in tissue regeneration and cancer therapy.
• Current limitations include nanoparticle aggregation during loading, hindering concentrated and active delivery.
• Non-viral gene delivery systems face challenges in stability and efficient loading into biomaterials.

Purpose of the Study:

• To develop and validate a novel process for loading concentrated, un-aggregated non-viral gene delivery nanoparticles into various hydrogel scaffolds.
• To demonstrate the efficacy of encapsulated nanoparticles for gene delivery in vitro and in vivo.
• To overcome the nanoparticle aggregation issue in hydrogel-mediated gene delivery.

Main Methods:

• Utilized DNA/polyethylene imine (PEI) polyplexes as model non-viral gene delivery nanoparticles.
• Developed a loading process compatible with neutral polyethylene glycol (PEG), negatively charged hyaluronic acid (HA), and fibrin hydrogels.
• Employed various crosslinking chemistries for hydrogel fabrication and nanoparticle encapsulation.

Main Results:

• Successfully loaded concentrated and un-aggregated DNA/PEI polyplexes into diverse hydrogel types (PEG, HA, fibrin).
• Demonstrated high activity of the encapsulated polyplexes in both in vitro and in vivo gene delivery assays.
• The developed process prevented nanoparticle aggregation during the hydrogel loading phase.

Conclusions:

• The novel loading process enables the incorporation of concentrated, active gene delivery nanoparticles into hydrogels.
• This advancement is expected to significantly enhance hydrogel-mediated non-viral gene delivery for regenerative medicine and oncology.
• The method provides a robust platform for developing advanced therapeutic hydrogel systems.