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Osteoclasts are cells responsible for bone resorption and remodeling. They originate from hematopoietic progenitor cells present in the bone marrow. Numerous progenitor cells fuse to form multinucleated cells, each with 10-20 nuclei. A single osteoclast has a diameter of 150 to 200 µM. These cells have ruffled borders that break down the underlying bone tissue and release minerals such as calcium into the blood in bone resorption. Osteoclasts cling to bones with their ruffled edges during...
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Cell-tethered ligands modulate bone remodeling by osteoblasts and osteoclasts.

Rebecca S Hayden1, Jean-Philippe Fortin2, Benjamin Harwood2

  • 14 Colby St., Medford, MA 02155 (USA).

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This study developed an in vitro bone model using silk biomaterials to mimic osteoblast and osteoclast interactions, revealing how specific signaling pathways influence bone remodeling and mineralization.

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biomedical applicationsbiomineralizationcharacterization toolstissue engineering

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Area of Science:

  • Biomaterials Science
  • Tissue Engineering
  • Cell Biology

Background:

  • Bone remodeling involves complex interactions between osteoblasts and osteoclasts.
  • Current in vitro models often fail to fully replicate these intricate cellular dynamics.
  • Silk protein biomaterials offer a versatile platform for tissue engineering applications.

Purpose of the Study:

  • To establish a co-culture model simulating osteoblast and osteoclast function in vitro.
  • To quantify bone remodeling using engineered silk biomaterials.
  • To investigate the role of G protein-coupled receptor (GPCR) signaling in bone remodeling.

Main Methods:

  • Engineered silk protein biomaterials in 2D and 3D formats were used.
  • Human mesenchymal stem cells (hMSCs) expressing tethered agonists for GPCRs (PTH and GIP) were utilized.
  • Scanning Electron Microscopy (SEM) and image processing were employed to create 3D digital surface models for quantitative analysis.

Main Results:

  • Co-cultures with tethered parathyroid hormone (PTH) showed increased calcium deposition and surface roughness.
  • Co-cultures with tethered glucose-dependent insulinotropic peptide (GIP) exhibited decreased surface roughness.
  • Increased surface roughness in monocultures was not observed, highlighting the importance of cell-cell interactions.

Conclusions:

  • The developed in vitro model effectively mimics osteoblast-osteoclast interactions during bone remodeling.
  • Tethered PTH signaling, in conjunction with osteoclast-osteoblast interactions, promotes mineralization.
  • This model provides a valuable tool for understanding bone remodeling processes and designing targeted therapies.