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3D Printed Integrated Bionic Oxygenated Scaffold for Bone Regeneration.

Yihan Wang1, Changnan Xie1, Zhiming Zhang2

  • 1Department of Spinal Surgery, Orthopedic Medical Center, Zhujiang Hospital, Southern Medical University, Guangzhou 510280, China.

ACS Applied Materials & Interfaces
|June 21, 2022
PubMed
Summary
This summary is machine-generated.

This study presents a novel 3D printed scaffold that releases oxygen to enhance bone regeneration. The bionic scaffold improved cell survival and promoted bone repair in animal models, offering a promising strategy for bone defects.

Keywords:
3D printed scaffoldsbone regenerationhypoxialarge bone defectsoxygenated

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Regenerative Medicine

Background:

  • Large bone defects pose significant challenges in bone tissue engineering.
  • Hypoxia and ischemia in defect sites impede seed cell survival and tissue regeneration.
  • Existing oxygen-releasing materials have limitations like rapid degradation and poor mechanical properties.

Purpose of the Study:

  • To develop a novel 3D printed bionic oxygenated scaffold for enhanced bone defect repair.
  • To address the limitations of current oxygen-releasing materials in bone tissue engineering.
  • To investigate the scaffold's potential for promoting cell survival, osteogenic differentiation, and bone regeneration.

Main Methods:

  • Fabrication of a 3D printed scaffold using gelatin-calcium peroxide (CaO2) microspheres, polycaprolactone (PCL), and nanohydroxyapatite (nHA) via low-temperature molding.
  • Characterization of the scaffold's mechanical properties and hierarchical porous structure.
  • In vitro assessment of cytocompatibility, sustained oxygen release, and effects on bone marrow mesenchymal stem cells under hypoxic conditions.
  • In vivo evaluation of the scaffold's efficacy in a rabbit calvarial defect model.

Main Results:

  • The fabricated scaffold exhibited excellent mechanical properties and a bionic hierarchical porous structure.
  • Sustained oxygen release for over two weeks was observed, with excellent cytocompatibility.
  • The scaffold significantly enhanced bone marrow mesenchymal stem cell survival, growth, and osteogenic differentiation under hypoxia.
  • In vivo studies demonstrated efficient bone repair in rabbit calvarial defects.

Conclusions:

  • The integrated bionic PCL/nHA/CaO2 scaffold offers sustainable oxygen release and promotes effective bone regeneration.
  • The scaffold's mechanism involves reducing hypoxia-inducible factor-1α accumulation and enhancing osteogenic gene expression.
  • This novel scaffold presents a promising clinical strategy for addressing large bone defects.