Chitosan hydrogel as siRNA vector for prolonged gene silencing

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• RNA Therapeutics

Background:

• Periodontitis causes alveolar bone resorption and tooth loss.
• Current treatments lack effective methods for bone protection.
• RNA interference (RNAi) offers a potential therapeutic avenue.

Purpose of the Study:

• To develop a thermosensitive chitosan hydrogel for sustained siRNA delivery.
• To investigate the hydrogel's efficacy in silencing RANK signaling.
• To evaluate the potential of this system for treating periodontal bone loss.

Main Methods:

• Fabrication of a thermosensitive chitosan hydrogel.
• In vitro assessment of hydrogel properties (gelation, degradation, siRNA release).
• Evaluation of cell viability and gene silencing efficacy.
• In vivo assessment of siRNA release in mice.

Main Results:

• The hydrogel formed rapidly at body temperature and exhibited controlled degradation.
• Sustained in vitro and in vivo siRNA release was observed for up to 14 days.
• High cell viability was maintained, and prolonged RANK knockdown was achieved.
• The hydrogel protected siRNA from degradation, extending its presence compared to free siRNA.

Conclusions:

• Chitosan hydrogel serves as an effective reservoir and vector for local siRNA delivery.
• This system shows promise for sustained RNAi-based therapy in periodontal disease.
• Further research can explore its application in protecting alveolar bone.