Nano-assisted dynamically assembled hydrogels with strong tissue adhesion and proactive immunomodulation for bone...

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Irregular bone defects present significant challenges in surgical repair.
• Existing bone scaffolds lack shape adaptability, tissue adhesion, and immunomodulatory properties.
• Effective bone regeneration requires enhanced mechanical support, inflammation control, and osteogenic activity.

Purpose of the Study:

• To develop a supramolecular hydrogel scaffold for irregular bone defect repair.
• To integrate bio-adhesion, mechanical strength, and immunomodulatory functions into a single system.
• To evaluate the efficacy of the hydrogel in promoting bone regeneration.

Main Methods:

• Fabrication of a hydrogel scaffold using polyphenols, polypeptides, and clay nanosheets (CNSs) via supramolecular assembly.
• Incorporation of catechol and guanidinium groups for bio-adhesion and antimicrobial/immunomodulatory activities.
• Enhancement of mechanical properties and osteogenic promotion through CNS incorporation and bioactive ion release.

Main Results:

• The developed hydrogel exhibits robust bio-adhesion to bone tissue and self-healing properties.
• The scaffold demonstrates superior mechanical strength and effective immunomodulatory and antimicrobial activities.
• In vivo studies confirmed accelerated bone defect healing, with the hydrogel adapting to defects and regulating the inflammatory environment.

Conclusions:

• The novel hydrogel scaffold represents a promising strategy for treating irregular bone defects.
• The synergistic integration of bio-adhesion, mechanical enhancement, and immunomodulation facilitates bone regeneration.
• This versatile approach holds potential for various tissue regeneration applications beyond bone.