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Updated: May 10, 2026
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Site-Directed Immobilization of Bone Morphogenetic Protein 2 to Solid Surfaces by Click Chemistry
Published on: March 29, 2018
Catechol-functionalized adhesive polymer nanoparticles for controlled local release of bone morphogenetic protein-2
Hong Jae Lee1, Ahn Na Koo, Suk Won Lee
1Department of Maxillofacial Biomedical Engineering & Institute of Oral Biology, School of Dentistry, Kyung Hee University, 1 Hoegi-dong, Dongdaemun-gu, Seoul 130-701, Republic of Korea.
Summary
We developed novel titanium-adhesive nanoparticles to functionalize titanium surfaces with bone-forming properties. These nanoparticles stably load and release bone morphogenetic protein-2 (BMP-2), enhancing stem cell activity for improved medical devices.
Area of Science:
- Biomaterials Science
- Surface Chemistry
- Regenerative Medicine
Background:
- Titanium (Ti) is widely used in medical implants but lacks inherent osteogenic properties.
- Enhancing Ti surface bioactivity is crucial for improving implant osseointegration and clinical outcomes.
- Controlled delivery of growth factors like bone morphogenetic protein-2 (BMP-2) can stimulate bone formation.
Purpose of the Study:
- To develop a novel surface functionalization strategy for titanium (Ti) using Ti-adhesive nanoparticles.
- To create a system capable of stable loading and controlled release of bone morphogenetic protein-2 (BMP-2).
- To evaluate the osteogenic potential of the functionalized Ti surfaces on human adipose-derived stem cells (hADSCs).
Main Methods:
- Synthesized Ti-adhesive nanoparticles via self-assembly of catechol-poly(L-aspartic acid)-b-poly(L-phenylalanine) (Cat-PAsp-PPhe) diblock copolymers.
- Immobilized nanoparticles onto Ti surfaces, confirmed by Field-Emission Scanning Electron Microscopy (Fe-SEM) and X-ray Photoelectron Spectroscopy (XPS).
- Loaded nanoparticles with BMP-2 and assessed its controlled release kinetics and effects on hADSC attachment, proliferation, spreading, and alkaline phosphatase (ALP) activity.
Main Results:
- Uniform immobilization of Ti-adhesive nanoparticles on Ti surfaces was achieved.
- Surface functionalization significantly altered surface wettability (water contact angle reduction).
- BMP-2 was effectively loaded, controllably released for up to 40 days, and significantly promoted hADSC osteogenic differentiation (attachment, proliferation, spreading, ALP activity).
Conclusions:
- Catechol-functionalized Ti-adhesive nanoparticles provide a robust platform for enhancing Ti surface osteogenic properties.
- This approach enables stable loading and controlled release of BMP-2, promoting stem cell-based bone regeneration.
- The developed functionalization strategy holds promise for various medical devices requiring improved bioactivity and performance.
