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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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The endocrine system produces and secretes hormones, which interact with the skeletal system. These hormones control bone growth, maintain bone once it is formed, and remodel it.
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Aging and its effect on bone remodeling is the most common cause of bone disorders. In young and healthy people, bone deposition and resorption happen at an equal rate to maintain optimal bone health.
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Modulation of osteoblast differentiation and function by the P2X4 receptor.

Isabel R Orriss1, Bethan K Davies2, Lucie E Bourne2

  • 1Department of Comparative Biomedical Sciences, Royal Veterinary College, Royal College Street, London, NW1 0TU, UK. iorriss@rvc.ac.uk.

Purinergic Signalling
|August 17, 2022
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The P2X4 receptor influences bone cell function, promoting osteoblast differentiation and inhibiting adipocyte formation. Blocking this receptor impairs bone formation and osteoclast activity.

Keywords:
Bone formationDifferentiationOsteoblastP2X4 receptor

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Area of Science:

  • Bone Biology
  • Cell Signaling
  • Receptor Pharmacology

Background:

  • Bone cells express various P2 receptor subtypes with known functions.
  • The P2X4 receptor is highly expressed in osteoblasts and osteoclasts, but its function remains undefined.

Purpose of the Study:

  • To investigate the functional role of the P2X4 receptor in bone cells using selective antagonists.
  • To determine the effect of P2X4 receptor blockade on osteoblast and osteoclast activity.

Main Methods:

  • Utilized selective P2X4 receptor antagonists (5-BDBD and PSB-12062).
  • Assessed effects on osteoblast differentiation, alkaline phosphatase activity, cell number, and adipocyte differentiation.
  • Analyzed gene expression of osteoblast markers and adipogenic transcription factors.
  • Evaluated osteoclast formation and resorptive activity.

Main Results:

  • P2X4 receptor antagonists dose-dependently decreased bone formation (60-100%).
  • Inhibition of alkaline phosphatase activity and osteoblast marker gene expression was observed.
  • Increased adipocyte differentiation and PPARG expression occurred with antagonist treatment.
  • Osteoclast formation and resorptive activity were significantly reduced by antagonists.

Conclusions:

  • The P2X4 receptor plays a crucial role in modulating bone cell function.
  • It appears to favor osteogenic lineage commitment over adipogenic differentiation in bone cells.
  • P2X4 receptor signaling is important for maintaining bone homeostasis.