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Bone Formation by Intramembranous Ossification01:29

Bone Formation by Intramembranous Ossification

Intramembranous ossification is one of the two processes involved in the development of bones within an embryo. The flat bones of the face, most of the cranial bones, and the clavicles are formed via this process. During intramembranous ossification, the bones develop directly from sheets of undifferentiated mesenchymal connective tissue.
The process begins when mesenchymal cells in the embryonic skeleton gather together and differentiate into osteogenic cells, which then develop into...

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Ceramic Omnidirectional Bioprinting in Cell-Laden Suspensions for the Generation of Bone Analogs
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Clay enriched silk biomaterials for bone formation.

Aneta J Mieszawska1, Jabier Gallego Llamas, Christopher A Vaiana

  • 1Department of Biomedical Engineering, Tufts University, Medford, MA 02155, USA.

Acta Biomaterialia
|May 10, 2011
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Summary

Silk/clay composite biomaterials show promise for bone regeneration. These materials support human mesenchymal stem cell growth and osteogenic differentiation, indicating potential for bone tissue engineering applications.

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Regenerative Medicine

Background:

  • Silk fibroin provides a mechanically stable scaffold for bone regeneration.
  • Silica-rich inorganic species from clay montmorillonite and sodium silicate mimic bioactive glasses.
  • Developing effective biomaterials is crucial for bone tissue formation and repair.

Purpose of the Study:

  • To investigate the potential of silk/clay composite biomaterials for bone tissue formation.
  • To compare the osteogenic support of silk/clay composites versus silk/sodium silicate controls.
  • To evaluate cell adhesion, proliferation, and osteogenic marker expression on these biomaterials.

Main Methods:

  • Fabrication of silk/clay composite biomaterial films.
  • Culture of human bone marrow-derived mesenchymal stem cells on the biomaterials.
  • Assessment of cell adhesion and proliferation.
  • Quantitative real-time polymerase chain reaction analysis of osteogenic markers (alkaline phosphatase, bone sialoprotein, collagen type 1).
  • Microscopic evaluation of collagen deposition.

Main Results:

  • Mesenchymal stem cells adhered to and proliferated on silk/clay composites over 2 weeks.
  • Increased transcript levels for key osteogenic markers were observed in cells cultured on silk/clay films compared to controls.
  • Early evidence of bone formation, indicated by collagen deposition, was more pronounced on silk films with higher clay content.

Conclusions:

  • Silk/clay composite biomaterials effectively support human mesenchymal stem cell osteogenic differentiation.
  • These composites show potential as scaffolds for bone regenerative applications.
  • Further research into silk/clay systems is warranted for bone tissue engineering needs.