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Related Experiment Videos

Expression and function of P2 receptors in bone.

J A Gallagher1, K A Buckley

  • 1Human Bone Cell Research Group, University of Liverpool, Liverpool, UK. jag1@liv.ac.uk

Journal of Musculoskeletal & Neuronal Interactions
|March 11, 2005
PubMed
Summary

Extracellular adenosine 5'-triphosphate (ATP) and other nucleotides signal through P2 receptors on bone cells, influencing skeletal growth and regeneration. These signals integrate local and systemic cues to regulate bone remodeling by affecting osteoblasts and osteoclasts.

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Area of Science:

  • Skeletal Biology
  • Cell Signaling
  • Bone Physiology

Background:

  • Adenosine 5 '-triphosphate (ATP) is a key extracellular regulator in bone.
  • Bone cells express P2 receptors (P2Y and P2X subclasses) that bind extracellular nucleotides.
  • Nucleotide release into the bone microenvironment activates these receptors.

Purpose of the Study:

  • To investigate the role of extracellular ATP and P2 receptors in bone cell function.
  • To understand how P2 receptor signaling influences osteoblast and osteoclast activity.
  • To elucidate the mechanisms of bone remodeling regulation by nucleotides.

Main Methods:

  • Analysis of P2 receptor expression and function on osteoblasts and osteoclasts.
  • Investigating downstream signaling pathways following P2 receptor activation.

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  • Examining the effects of P2 receptor modulation on gene expression and cell behavior.

    • Main Results:

    • P2 receptor activation on osteoblasts, particularly P2Y1, enhances osteoblastic gene expression and RANKL, promoting osteoclastogenesis.
    • P2X7 receptor blockade on osteoclast precursors inhibits fusion and resorption.
    • Co-activation of P2Y and PTH1 receptors on osteoblasts leads to synergistic gene expression.

    Conclusions:

    • Extracellular nucleotides acting via P2 receptors are crucial regulators of bone remodeling.
    • P2 receptor signaling integrates local and systemic signals to control bone growth and regeneration.
    • Targeting P2 receptors offers potential therapeutic strategies for bone disorders.