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Bone contains a relatively small number of cells entrenched in a matrix of collagen fibers that provide an adherent surface for inorganic salt crystals. Both components of the matrix, organic and inorganic, contribute to the unusual properties of bone. Without collagen, bones would be brittle and shatter easily. Without mineral crystals, bones would flex and provide little support. This can be observed by an experiment: when the minerals of a bone are dissolved by soaking the bone in...
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Most bones contain compact and spongy osseous tissue, but their distribution and concentration vary based on the bone's overall function.
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The hyoid bone is a small U-shaped bone located in the upper neck at the level of the inferior mandible, with its tips pointing posteriorly. It does not directly articulate with any other bone in the body. The hyoid acts as the attachment site for the tongue, the larynx, and the pharynx. It is held in position by a series of small muscles attached from above or below. These muscles help to move the hyoid up/down or forward/back in coordination with movements of the tongue, larynx, and pharynx...
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Demineralized Bone Scaffolds with Tunable Matrix Stiffness for Efficient Bone Integration.

Qingxia Hu1, Mengying Liu1, Guobao Chen1

  • 1Key Laboratory of Biorheological Science and Technology (Chongqing University), Ministry of Education, Bioengineering College and Mechanobiology and Regenerative Medicine Laboratory, Bioengineering College , Chongqing University , Chongqing 400044 , P. R. China.

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PubMed
Summary

Controlling demineralized bone matrix scaffold stiffness using decalcification duration influences stem cell differentiation. Low stiffness scaffolds promote bone repair and angiogenesis by modulating cell signaling pathways.

Keywords:
bone integrationdemineralized bone matrix scaffoldmatrix stiffnessmesenchymal stem cellsrabbit femoral condyle defect model

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Stem Cell Biology

Background:

  • Matrix stiffness is a critical biophysical cue influencing stem cell fate.
  • Fabricating 3D scaffolds with tunable mechanical properties while preserving microstructure is challenging.

Purpose of the Study:

  • To develop a method for creating 3D demineralized bone matrix scaffolds with varying stiffness.
  • To investigate the effect of scaffold stiffness on bone marrow mesenchymal stem cell (MSC) behavior and bone defect repair.

Main Methods:

  • Demineralized bone matrix scaffolds were fabricated with controlled decalcification durations (1h, 12h, 5 days) to achieve high, medium, and low compressive moduli.
  • Scaffold microstructure (pore size, porosity) was analyzed.
  • In vitro studies assessed MSC osteogenic differentiation.
  • In vivo studies involved rat subcutaneous implantation and rabbit femoral condylar defect repair, evaluating cell infiltration, collagen deposition, angiogenesis, and bone formation.

Main Results:

  • Scaffold stiffness was successfully modulated without altering pore size or porosity.
  • Low stiffness scaffolds significantly promoted osteogenic differentiation of MSCs in vitro.
  • In vivo, low stiffness scaffolds enhanced cell infiltration, collagen deposition, angiogenesis, and bone repair in defect models.
  • The SDF-1α/CXCR signaling pathway was identified as crucial for stiffness-mediated bone repair.

Conclusions:

  • Controlled decalcification provides a method to fabricate 3D bone grafts with tunable stiffness.
  • Scaffold stiffness plays a significant role in regulating MSC behavior and promoting bone regeneration.
  • This approach offers a valuable tool for studying stiffness-dependent stem cell responses in 3D and developing advanced bone grafts.