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Scaffold-free human mesenchymal stem cell construct geometry regulates long bone regeneration.

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Engineered human mesenchymal stem cell (hMSC) tubes with localized growth factors promote bone healing. This biomimetic approach, mimicking natural bone development, enhances defect repair more effectively than cell sheets.

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Orthopedic Engineering

Background:

  • Biomimetic strategies partially replicate developmental processes for bone tissue engineering.
  • Previous work demonstrated functional restoration of femoral defects using scaffold-free hMSC condensates with localized morphogen delivery and delayed mechanical loading.
  • The impact of construct geometry on bone healing outcomes remains largely unexplored.

Purpose of the Study:

  • To investigate the hypothesis that engineered hMSC tubes, mimicking femoral diaphyses, induce endochondral ossification via localized transforming growth factor (TGF)-β1 and bone morphogenetic protein (BMP)-2.
  • To compare the efficacy of TGF-β1 + BMP-2 presenting hMSC tubes against hMSC sheets in enhancing defect healing with delayed in vivo loading.

Main Methods:

  • Engineered hMSC tubes with localized presentation of TGF-β1 and BMP-2.
  • In vitro assessment of chondrogenic priming and endochondral differentiation.
  • In vivo subcutaneous and orthotopic implantation in a femoral defect model with delayed mechanical loading.

Main Results:

  • Localized morphogen presentation stimulated chondrogenic priming and endochondral differentiation in vitro.
  • Subcutaneous implantation resulted in hMSC tubes forming cartilage templates that underwent subsequent bony remodeling.
  • Orthotopic implantation demonstrated that hMSC tubes significantly enhanced endochondral defect healing compared to hMSC sheets, with minimal ectopic bone formation and tissue resembling normal growth plate.

Conclusions:

  • Engineered hMSC tubes with localized morphogen delivery effectively promote endochondral ossification and bone defect healing.
  • Construct geometry (tubes vs. sheets) significantly influences healing outcomes, with tubes showing superior performance.
  • This study highlights the interplay between hMSC condensation geometry, morphogen availability, and mechanical stimuli in recapitulating developmental processes for advanced biomimetic bone tissue engineering.