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Growth of Cartilage and Bone Tissue01:27

Growth of Cartilage and Bone Tissue

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Chondrocytes form a temporary cartilaginous model by dividing and secreting a thick gel-like extracellular matrix. Once the chondrocytes undergo programmed cell death, osteoblasts enter the site of the cartilaginous model. The process of replacing the temporary cartilaginous model with bone in an ordered manner is called endochondral ossification. In endochondral ossification, not all of the cartilage is replaced by bone tissue. Some cartilage that performs a protective and supportive function...
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Combinatorial scaffold morphologies for zonal articular cartilage engineering.

J A M Steele1, S D McCullen1, A Callanan2

  • 1Department of Materials, Imperial College London, London, UK; Department of Bioengineering, Imperial College London, London, UK; Institute of Biomedical Engineering, Imperial College London, London, UK.

Acta Biomaterialia
|December 28, 2013
PubMed
Summary
This summary is machine-generated.

Engineered bilayered scaffolds mimic native cartilage structure, supporting chondrocyte extracellular matrix production for articular cartilage repair. Smaller pore sizes enhance matrix accumulation and gene expression, showing promise for regenerative medicine.

Keywords:
CartilageRegenerative medicineRepairScaffoldsTissue engineering

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Area of Science:

  • Biomaterials Science
  • Regenerative Medicine
  • Tissue Engineering

Background:

  • Articular cartilage has a complex, depth-dependent organization crucial for function.
  • Current regenerative medicine strategies face challenges in replicating this native structure.
  • Tissue engineering scaffolds offer a potential solution for zone-specific cartilage repair.

Purpose of the Study:

  • To fabricate and evaluate multi-zone cartilage scaffolds for articular cartilage regeneration.
  • To investigate the impact of scaffold architecture on chondrocyte extracellular matrix (ECM) production and mechanical properties.
  • To mimic the structural organization and functional interface of native cartilage's superficial zone.

Main Methods:

  • Fabrication of multi-zone scaffolds using electrostatic deposition of polymer microfibres onto particulate-templated scaffolds.
  • Utilized porogens of 0.03mm³ or 1.0mm³ to create varying scaffold architectures.
  • Incorporated aligned fibre membranes to enhance scaffold properties.
  • Performed zonal analysis of chondrocyte distribution, ECM accumulation (sulfated GAG), and gene expression (aggrecan).

Main Results:

  • Bilayered scaffolds successfully mimicked key structural characteristics of native cartilage.
  • Scaffolds supported chondrocyte ECM production and demonstrated zone-specific variations in cell number, ECM, and gene expression.
  • Smaller porogens (0.03mm³) significantly increased sulfated glycosaminoglycan (sGAG) accumulation and aggrecan gene expression.
  • Aligned fibre membranes improved mechanical and surface properties of the scaffolds.

Conclusions:

  • The developed bilayered scaffolds effectively support in vitro cartilage formation.
  • These scaffolds exhibit superior features compared to homogeneous particulate-templated scaffolds.
  • The fabricated scaffolds show significant promise for regenerative medicine strategies aimed at repairing articular cartilage lesions.