Hydroxyapatite-Tethered Peptide Hydrogel Promotes Osteogenesis.

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Nanotechnology

Background:

• Hydroxyapatite (HAp) is a key component of natural bone and possesses osteoinductive properties crucial for bone regeneration.
• Current bone regenerative engineering strategies require stable HAp-supporting hydrogels to prevent aggregation and maximize HAp's osteoinductivity.
• Developing methods to achieve homogeneous HAp dispersion within hydrogels is essential for effective bone tissue repair.

Purpose of the Study:

• To create a HAp-stabilizing hydrogel using peptide self-assembly for enhanced bone regenerative engineering applications.
• To investigate the molecular interactions and structural properties of the developed HAp-peptide hybrid hydrogel.
• To evaluate the biocompatibility and osteogenic potential of the HAp-peptide hydrogel for promoting bone cell differentiation and proliferation.

Main Methods:

• Peptide FmocFFRR was synthesized and utilized for HAp surface functionalization via arginine-phosphate interactions.
• FmocFFRR/HAp hybrid hydrogels were formed through self-assembly, enabling stable HAp dispersion.
• Microscopic and spectral characterizations confirmed molecular interactions; mechanical properties, biocompatibility (ATP assay, live-dead staining), cell attachment, 3D cell culturing, and osteogenesis marker expression (ALP, COL1, OCN) were assessed.

Main Results:

• FmocFFRR effectively capped HAp particles, facilitating stable dispersion within the self-assembled hydrogel.
• The FmocFFRR/HAp hydrogel demonstrated superior mechanical properties compared to the peptide hydrogel alone.
• Biocompatibility was confirmed, and the hydrogel supported both cell attachment and 3D cell culturing.
• 3D culturing of preosteoblasts within the hydrogel significantly upregulated key osteogenesis markers (ALP, COL1, OCN).

Conclusions:

• The developed FmocFFRR/HAp hybrid hydrogel provides a stable and effective platform for hydroxyapatite delivery in bone regenerative applications.
• The hydrogel's enhanced mechanical properties and demonstrated ability to promote osteoblast differentiation highlight its potential for bone tissue engineering.
• This peptide-stabilized HAp hydrogel represents a promising biomaterial for advancing bone regenerative strategies.