Nanoarchitecture-Integrated Hydrogel Boosts Angiogenesis-Osteogenesis-Neurogenesis Tripling for Infected Bone...

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Orthopedic Surgery

Background:

• Infected fracture healing involves complex cellular and molecular interactions.
• While angiogenesis and osteogenesis are key, neurogenesis's role in fracture healing is increasingly recognized.
• Current treatments for infected fractures face challenges in promoting comprehensive tissue regeneration.

Purpose of the Study:

• To develop a nanocomposite hydrogel for infected fracture healing.
• To investigate the hydrogel's ability to deliver zinc, gallium, and humic acids (HAs) in a pH-responsive manner.
• To evaluate the hydrogel's combined antibacterial effects and promotion of angiogenesis, osteogenesis, and neurogenesis.

Main Methods:

• Fabrication of a pH-responsive nanocomposite hydrogel incorporating zinc-gallium-humic acids (HAs) nanoparticles.
• Assessment of the hydrogel's timed release of Zn2+, Ga3+, and HAs.
• Evaluation of the hydrogel's antibacterial efficacy and its impact on angiogenesis, osteogenesis, and neurogenesis in a mouse model of infected fractures.

Main Results:

• The developed hydrogel demonstrated potent antibacterial activity.
• Timed release of Zn2+, Ga3+, and HAs promoted angiogenesis, osteogenesis, and neurogenesis.
• Enhanced neurogenesis created a synergistic cycle, further boosting angiogenesis and osteogenesis.
• The hydrogel facilitated rapid infected fracture healing and improved tissue regeneration in mice.

Conclusions:

• The nanocomposite hydrogel offers a promising therapeutic strategy for infected fractures.
• Combining antibacterial properties with the promotion of angiogenesis, osteogenesis, and neurogenesis is effective.
• This approach establishes a mutually supportive regeneration cycle, leading to improved healing outcomes.