Genetic Engineered Ultrasound-Triggered Injectable Hydrogels for Promoting Bone Reconstruction

Area of Science:

• Biomaterials Science
• Gene Therapy
• Regenerative Medicine

Background:

• Current gene therapy strategies face challenges like complexity, single treatment modalities, and invasive implantation.
• There is a need for advanced, minimally invasive gene delivery systems for effective in vivo gene therapy.

Purpose of the Study:

• To develop an ultrasound-triggered injectable hydrogel system for in situ gene therapy.
• To promote bone reconstruction and angiogenesis in osteoporosis models via genetic engineering.

Main Methods:

• Constructed injectable hydrogels using ultrasonic technology for in situ cross-linking and gene delivery.
• Utilized ultrasound-triggered calcium release to activate transglutaminase and fibrinogen cross-linking.
• Incorporated liposomes carrying the Zinc-finger E-box-binding homeobox 1 (ZEB1) gene plasmid (Lip-ZEB1) for targeted gene transfection.

Main Results:

• Achieved ultrasound-triggered in situ cross-linking and successful delivery of Lip-ZEB1.
• Demonstrated sustained release of ZEB1 gene plasmid, leading to its introduction into endothelial cell genomes.
• Observed promotion of angiogenesis and bone reconstruction through the ZEB1/Notch signaling pathway.

Conclusions:

• The developed ultrasound-triggered injectable hydrogels offer an advanced gene delivery system.
• This strategy enables in situ gene therapy with potential for treating bone defects and osteoporosis.
• The system overcomes limitations of traditional gene therapy, offering a minimally invasive approach.