Improved Black Phosphorus Nanocomposite Hydrogel for Bone Defect Repairing: Mechanisms for Advancing Osteogenesis

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Nanotechnology

Background:

• Bone defects from fractures and diseases often require external intervention for healing.
• Bone tissue engineering offers a promising alternative to conventional bone grafting methods.
• Nanobiomaterials can improve osteoblast function and promote bone regeneration.

Purpose of the Study:

• To investigate the use of amino-silicon phthalocyanine (SiPc-NH2) to stabilize black phosphorus (BP) nanosheets for bone repair.
• To develop a self-healing hydrogel system incorporating BP and SiPc-NH2 for enhanced osteogenesis and antimicrobial activity.
• To explore the underlying mechanisms of BP-SiPc-NH2 in promoting bone regeneration, focusing on mitochondrial function and signaling pathways.

Main Methods:

• Co-assembly of black phosphorus (BP) and amino-silicon phthalocyanine (SiPc-NH2) to create a self-healing hydrogel.
• Characterization of BP-SiPc-NH2 nanosheets for improved dispersion, stability, and biocompatibility.
• Evaluation of osteogenic and antimicrobial properties of the developed hydrogel.
• Investigation of mitochondrial morphology and signaling pathways (Hippo and Wnt) involved in osteogenesis.

Main Results:

• A stable, well-dispersed BP-SiPc-NH2 nanosheet hydrogel was successfully synthesized.
• The hydrogel demonstrated enhanced biocompatibility, reduced BP oxidation, and improved photothermal conversion.
• Significant osteogenic and antimicrobial effects were observed.
• BP-SiPc-NH2 promoted osteogenesis by regulating mitochondrial homeostasis and cellular bioenergetics via Hippo and Wnt signaling crosstalk.

Conclusions:

• The developed self-healing hydrogel using BP and SiPc-NH2 effectively addresses the limitations of black phosphorus for bone repair.
• This novel biomaterial strategy shows significant potential for enhancing bone regeneration and combating infection.
• The findings highlight the importance of mitochondrial morphology and signaling pathway regulation in bone tissue engineering.