Multi-protein delivery by nanodiamonds promotes bone formation.

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Nanotechnology

Background:

• Bone morphogenetic proteins (BMPs) are FDA-approved for bone formation but face delivery limitations.
• Current BMP delivery relies on bulky collagen sponges, hindering wider medical and dental applications.

Purpose of the Study:

• To evaluate detonation nanodiamonds (NDs) as an injectable delivery vehicle for BMP-2 and basic fibroblast growth factor (bFGF).
• To assess the efficacy of ND-delivered BMP-2 and bFGF in promoting osteoblast progenitor cell differentiation and proliferation.

Main Methods:

• BMP-2 and bFGF were loaded onto biocompatible 4- to 5-nm nanodiamonds via physisorption.
• Nanodiamond-protein complexes were assessed for stability in colloidal solution and release kinetics under acidic conditions.
• The effect of co-delivered BMP-2 and bFGF on osteoblast progenitor cells was evaluated.

Main Results:

• Nanodiamonds effectively loaded and stabilized BMP-2 and bFGF in a colloidal solution.
• Controlled release of proteins was observed under slightly acidic conditions.
• Simultaneous delivery of BMP-2 and bFGF via NDs significantly induced differentiation and proliferation in osteoblast progenitor cells.

Conclusions:

• Detonation nanodiamonds serve as an effective injectable alternative to collagen sponges for delivering BMP-2 and bFGF.
• This nanodiamond-based delivery system shows significant potential for promoting bone formation in various applications.