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Related Experiment Videos

HMGB1 expression and release by bone cells.

Kanokwan Charoonpatrapong1, Rita Shah, Alexander G Robling

  • 1Department of Anatomy and Cell Biology, Indiana University School of Medicine (IUSM), Indianapolis, Indiana 46202, USA.

Journal of Cellular Physiology
|January 19, 2006
PubMed
Summary
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High mobility group box 1 (HMGB1) and its receptor (RAGE) are present in bone cells, influencing immune-bone crosstalk. Parathyroid hormone (PTH) modulates HMGB1 release, impacting bone remodeling and immune responses.

Area of Science:

  • Immunology
  • Bone Biology
  • Cell Signaling

Background:

  • Immune and bone cells communicate via shared cytokine networks, contributing to immune-associated bone diseases.
  • The receptor activator of NF-kappaB ligand (RANKL)/osteoprotegerin (OPG)/receptor activator of NF-kappaB (RANK) axis is crucial for dendritic cell (DC) function and bone remodeling.
  • Dendritic cells release high mobility group box 1 (HMGB1), a cytokine that binds to the receptor for advanced glycation end products (RAGE), mediating DC-T-cell interactions.

Purpose of the Study:

  • To investigate the expression and release of HMGB1 and RAGE in osteoblasts and osteoclasts.
  • To determine the effect of parathyroid hormone (PTH) on HMGB1 release from bone cells.

Main Methods:

  • Immunohistochemistry and immunocytochemistry were used to detect HMGB1 and RAGE in primary osteoblasts and osteoclasts.

Related Experiment Videos

  • HMGB1 levels in culture media from osteoblast and osteoclast cultures were quantified.
  • The impact of PTH on HMGB1 release was assessed in different cell lines, focusing on adenylyl cyclase activation.

    • Main Results:

    • HMGB1 and RAGE are expressed in primary osteoblasts and osteoclasts.
    • HMGB1 is released into the media by both osteoblasts and osteoclasts.
    • PTH differentially affects HMGB1 release, attenuating it in osteoblasts and augmenting it in osteosarcoma cells, primarily through adenylyl cyclase.

    Conclusions:

    • The HMGB1/RAGE signaling axis is confirmed to be present and functional within the bone microenvironment.
    • HMGB1 released by bone cells may play a role in immune-bone crosstalk and associated pathologies.
    • PTH's modulation of HMGB1 release suggests a mechanism linking systemic hormonal regulation to bone-immune interactions.