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Updated: Jun 13, 2025
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Site-Directed Immobilization of Bone Morphogenetic Protein 2 to Solid Surfaces by Click Chemistry
Published on: March 29, 2018
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Rapidly Polymerizing Click Hydrogel Provides Localized Delivery of rhBMP2 to Promote Bone Formation
D Joshua Cohen1, Thomas W Jacobs1, D Scott Wilson2
1Department of Biomedical Engineering, Virginia Commonwealth University, Richmond, Virginia, USA.
Pharmacology Research & Perspectives
|June 9, 2025
Summary
This study introduces a novel click hydrogel for delivering bone morphogenetic protein-2 (BMP2). The hydrogel offers sustained release, improved safety, and effective bone regeneration compared to traditional collagen sponges.
Area of Science:
- Biomaterials Science
- Regenerative Medicine
- Drug Delivery Systems
Background:
- Effective tissue regeneration necessitates controlled delivery of bioactive agents like bone morphogenetic protein-2 (BMP2).
- Current BMP2 delivery using collagen sponges can cause burst release and ectopic bone formation.
- Biodegradable carriers are crucial for targeted delivery and sustained therapeutic release.
Purpose of the Study:
- To develop and evaluate a novel copper-free polyethylene glycol-based click hydrogel for delivering BMP2.
- To compare the safety and efficacy of this hydrogel delivery system with traditional collagen sponges in bone regeneration models.
- To assess the potential of click hydrogels for controlled delivery of bioactive agents, minimizing off-target effects.
Main Methods:
- Development of a copper-free click hydrogel system for BMP2 delivery.
- In vitro assessment of hydrogel cytotoxicity and BMP2-induced osteogenic marker production.
- In vivo evaluation in mouse cranial defects, comparing hydrogel + BMP2 to collagen sponge + BMP2.
- Safety assessment including systemic toxicity and allergic sensitization in rabbits.
Main Results:
- The click hydrogel demonstrated no in vitro or systemic toxicity and no allergic sensitization in rabbits.
- In vitro studies showed that released BMP2 increased osteogenic marker production.
- In vivo, hydrogel + BMP2 achieved equivalent defect closure and total bone growth compared to collagen + BMP2, with increased vascularization within the defect and reduced off-target bone growth.
Conclusions:
- Copper-free click hydrogels are a safe and effective system for delivering BMP2 for bone regeneration.
- This hydrogel system provides sustained release, reducing the risk of ectopic bone formation associated with burst release.
- Click chemistry hydrogels show significant potential for the safe and effective delivery of various bioactive agents to targeted sites.
