Bone morphogenetic protein-2 delivery from polyelectrolyte multilayers enhances osteogenic activity on nanostructured...

Area of Science:

• Biomaterials Science
• Orthopedic Engineering
• Regenerative Medicine

Background:

• Incomplete osseointegration is a major cause of orthopedic implant failure.
• Developing biomaterials that promote osteogenesis is crucial for improving implant success rates.

Purpose of the Study:

• To deliver bone morphogenetic protein-2 (BMP-2) from titania nanotubes (Nt) modified with chitosan/heparin polyelectrolyte multilayers (PEMs).
• To evaluate the sustained release of BMP-2 and its osteogenic potential in vitro.

Main Methods:

• Titania nanotubes (Nt) were modified with chitosan/heparin polyelectrolyte multilayers (PEMs) for BMP-2 delivery.
• Surface characterization using scanning electron microscopy and X-ray photoelectron spectroscopy.
• In vitro assessment of BMP-2 release, cell proliferation, alkaline phosphatase (ALP) activity, total protein, calcium deposition, and osteocalcin expression.

Main Results:

• BMP-2 release showed an initial burst followed by sustained presentation from the PEM-modified surfaces.
• Surfaces with BMP-2 demonstrated significantly greater osteocalcin and calcium deposition compared to unmodified Nt surfaces.
• Enhanced osteogenic properties were observed without requiring supraphysiologic growth factor doses.

Conclusions:

• Polyelectrolyte multilayers (PEMs) provide a sustained delivery of BMP-2 from a biomimetic titania nanotube surface.
• This strategy enhances osteogenic properties, potentially improving bone healing and reducing orthopedic implant complications.
• The developed biomaterial offers a promising approach for improving outcomes in orthopedic surgery.