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Mechanically stimulated osteocytes regulate osteoblastic activity via gap junctions.

A F Taylor1, M M Saunders, D L Shingle

  • 1Department of Orthopaedics and Rehabilitation, The Pennsylvania State University College of Medicine, 500 University Drive, Hershey, PA 17033, USA.

American Journal of Physiology. Cell Physiology
|August 4, 2006
PubMed
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Osteocytes, bone cells within the matrix, communicate mechanical signals to osteoblasts. This communication, essential for bone remodeling, requires cell contact and specific signaling pathways.

Area of Science:

  • Biomineralization
  • Mechanobiology
  • Cellular Biology

Background:

  • Bone structure adapts to mechanical forces, suggesting a cellular 'mechanostat'.
  • Osteocytes, embedded in bone matrix, are ideal mechanosensors.
  • Osteocytes may orchestrate bone remodeling by signaling surface cells like osteoblasts.

Purpose of the Study:

  • To investigate if osteocytes can influence osteoblast activity in response to mechanical stimuli.
  • To elucidate the mechanisms of osteocyte-osteoblast communication in bone mechanotransduction.

Main Methods:

  • Developed a novel osteocyte-osteoblast co-culture model.
  • Applied physiological fluid shear stress to osteocytes while shielding osteoblasts.
  • Utilized co-culture models with other mesenchymal cells for comparison.

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Main Results:

  • Osteocytes exposed to fluid shear (4.4 dyn/cm²) increased shielded osteoblast alkaline phosphatase activity.
  • Physical contact between osteocytes and osteoblasts was necessary for this response.
  • Gap junction communication and ERK1/2 signaling pathways were crucial for the osteoblastic response.
  • This signaling capability was unique to osteocytes, not observed with other mesenchymal cells.

Conclusions:

  • Osteocytes actively communicate mechanical signals to osteoblasts, influencing bone remodeling.
  • This communication relies on direct cell-cell contact and specific intracellular signaling pathways.
  • Osteocytes play a unique and essential role in mechanotransduction within the bone microenvironment.