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Related Experiment Video

Updated: May 29, 2026

Distinctive Capillary Action by Micro-channels in Bone-like Templates can Enhance Recruitment of Cells for Restoration of Large Bony Defect
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Published on: September 11, 2015

Flowerbed-Inspired Mg-Loaded Scaffold Accelerates Critical-Sized Bone-Defect Repair by Reprogramming the

Xinyue Yang1, Cheng Li1, Chongnan Yan1

  • 1Department of Orthopaedic Surgery, Shengjing Hospital of China Medical University, Shenyang110055, Liaoning, China.

ACS Nano
|May 28, 2026
PubMed
Summary
This summary is machine-generated.

A novel biomimetic scaffold combining a magnesium-hydrogel with a porous titanium framework promotes bone defect repair. This innovative material recruits stem cells and modulates the immune response, enhancing bone regeneration in critical-sized defects.

Keywords:
alginate hydrogelsbone regenerationimmune microenvironmentmagnesium ionsingle-cell RNA sequencingtriply periodic minimal surface

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Repair of a Critical-sized Calvarial Defect Model Using Adipose-derived Stromal Cells Harvested from Lipoaspirate
11:31

Repair of a Critical-sized Calvarial Defect Model Using Adipose-derived Stromal Cells Harvested from Lipoaspirate

Published on: October 31, 2012

Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Orthopedic Engineering

Background:

  • Critical-sized bone defects present significant challenges due to limited self-healing.
  • Existing treatments often struggle with central defect regeneration and load-bearing capacity.

Purpose of the Study:

  • To develop a biomimetic composite scaffold for repairing critical-sized bone defects.
  • To create a simulated osteogenic niche that promotes bone regeneration in load-bearing areas.

Main Methods:

  • Fabrication of a composite scaffold integrating a magnesium-ion-loaded alginate hydrogel (PR/AlgMA/Mg) within a triply periodic minimal surface (TPMS) porous Ti6Al4V framework.
  • In vitro assessment of hydrogel properties, Mg2+ release, and osteogenic differentiation of mesenchymal stem cells (MSCs).
  • In vivo evaluation in rat calvarial and beagle femoral condyle defect models, including single-cell RNA sequencing analysis.

Main Results:

  • The PR/AlgMA/Mg hydrogel demonstrated controlled Mg2+ release and supported MSC osteogenic differentiation.
  • The composite scaffold significantly enhanced bone bridging in critical-sized calvarial defects.
  • Single-cell sequencing revealed a CCN3+ MSC subpopulation crucial for osteogenesis and immune modulation (M2 macrophage polarization) via PTN.
  • The TPMS framework ensured uniform stress distribution and facilitated cell infiltration.
  • In vivo, the scaffold promoted contact osteogenesis and improved biomechanical integration in femoral condyle defects.

Conclusions:

  • The biomimetic scaffold effectively constructs an osteogenic niche by recruiting progenitor cells and reprogramming the immune microenvironment.
  • This strategy shows significant promise for the repair of critical bone defects, particularly in load-bearing applications.
  • The combination of hydrogel properties and TPMS architecture offers a synergistic approach to bone regeneration.