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Accelerating Bone Healing by Decorating BMP-2 on Porous Composite Scaffolds.

Xiang Li1,2, Hua-Mo Yin3, En Luo1

  • 1State Key Laboratory of Oral Diseases & National Clinical Research Center for Oral Diseases & Department of Oral and Maxillofacial Surgery, West China Hospital of Stomatology, Sichuan University, Chengdu 610041, China.

ACS Applied Bio Materials
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Summary

New composite scaffolds enhance bone repair by incorporating nanohydroxyapatite, bioglass, and bone morphogenetic protein-2. These bioactive scaffolds promote osteogenic differentiation and achieve complete bone healing in rabbit calvarial defects.

Keywords:
bioactivitybone healingcomposite scaffoldsosteogenic lineagesustained release

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Orthopedic Surgery

Background:

  • Polymeric scaffolds are crucial for bone repair but often lack sufficient bioactivity.
  • Enhancing scaffold bioactivity is key to improving bone regeneration outcomes.

Purpose of the Study:

  • To develop osteoinductive poly(ε-caprolactone) (PCL) composite scaffolds with enhanced bioactivity for bone regeneration.
  • To investigate the effect of nanohydroxyapatite (nHA), bioglass (BG), and polydopamine (pDA)-bound bone morphogenetic protein-2 (BMP-2) on scaffold properties and osteogenic potential.

Main Methods:

  • Composite scaffolds were fabricated using PCL, nHA, BG, and pDA-BMP-2.
  • Scaffold hydrophilicity, cell affinity, and BMP-2 release kinetics were evaluated.
  • In vitro osteogenic differentiation of bone marrow stromal cells was assessed.
  • In vivo studies were conducted using rabbit calvarial defect models.

Main Results:

  • pDA deposition enhanced scaffold hydrophilicity and cell affinity.
  • pDA facilitated sustained release of BMP-2.
  • PHB-pDA-BMP-2 scaffolds significantly induced osteogenic differentiation of stromal cells compared to controls.
  • Complete bone healing of calvarial defects was observed in rabbits treated with PHB-pDA-BMP-2 scaffolds within 12 weeks.

Conclusions:

  • The developed PHB-pDA-BMP-2 composite scaffolds exhibit significant osteoinductive properties.
  • These scaffolds demonstrate potent osteogenic capability, leading to complete bone regeneration in vivo.
  • The designed scaffolds hold considerable promise for clinical applications in bone defect repair and regeneration.