Smart Inhalation Therapy: Boosting siRNA Efficacy with Inulin-Based Multifunctional Polymers.

Area of Science:

• Biomaterials Science
• Nanotechnology
• Gene Therapy

Background:

• Pulmonary diseases require effective siRNA delivery platforms to overcome lung barriers.
• Current methods struggle with efficient gene silencing in the airway epithelium.

Purpose of the Study:

• To synthesize and characterize a novel inulin-based copolymer for siRNA inhalation delivery.
• To evaluate the copolymer's potential as an effective carrier for pulmonary gene therapy.

Main Methods:

• Stepwise synthesis of an inulin (INU)-based copolymer, INU-VS-g-(PMeOx; bAPAE).
• Formation and characterization of siRNA polyplexes, including size, stability, and muco-diffusivity.
• Assessment of buffering capacity, endosomal escape, cytocompatibility, and gene silencing efficacy.

Main Results:

• Stable siRNA polyplexes (<30 nm) formed at low polymer/siRNA ratios (R=5).
• Polyplexes demonstrated efficient buffering, pH-dependent membrane destabilization, and mucus penetration.
• High cytocompatibility (>80% viability) and successful siRNA-mediated gene silencing were observed.

Conclusions:

• The inulin-based copolymer INU-VS-g-(PMeOx; bAPAE) is a promising siRNA carrier for pulmonary administration.
• Its properties facilitate overcoming lung barriers and achieving gene silencing.
• This highlights potential for treating respiratory diseases through advanced inhalation therapy.