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Related Experiment Videos

PPAR agonists modulate human osteoclast formation and activity in vitro.

B Y Chan1, A Gartland, P J M Wilson

  • 1Department of Clinical Biochemistry, Royal Liverpool University Hospital, The University of Liverpool, Liverpool, L69 3GA, UK.

Bone
|October 3, 2006
PubMed
Summary

Peroxisome proliferator-activated receptors (PPARs) are expressed in human osteoclasts. Isoform-specific PPAR agonists inhibit osteoclast formation and affect bone resorption, suggesting therapeutic potential for bone diseases.

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Area of Science:

  • Molecular biology
  • Cell biology
  • Pharmacology

Background:

  • Peroxisome proliferator-activated receptors (PPARs) are nuclear receptors with three isoforms (alpha, beta, gamma) involved in various cellular functions.
  • Osteoclasts are crucial for bone remodeling, and their dysregulation is implicated in bone diseases.
  • Understanding PPAR expression and function in osteoclasts can reveal new therapeutic targets.

Purpose of the Study:

  • To investigate the expression of all three PPAR isoforms in human osteoclast precursors and mature osteoclasts.
  • To determine the effects of non-selective and isoform-specific PPAR agonists on osteoclast formation and bone resorption in vitro.

Main Methods:

  • Human peripheral blood mononuclear cells (PBMCs) were differentiated into osteoclasts using RANKL and M-CSF.

Related Experiment Videos

  • Reverse transcription-polymerase chain reaction (RT-PCR) was used to detect PPAR isoform expression.
  • Osteoclast formation and resorption were quantified after treatment with fibrates and specific PPAR agonists (GW9578, L165041, ciglitizone).

    • Main Results:

    • All three PPAR isoforms (alpha, beta, gamma) were expressed throughout osteoclast differentiation and maturation.
    • Non-selective PPAR agonists (bezafibrate, fenofibrate) significantly inhibited osteoclast formation.
    • Isoform-specific agonists demonstrated dose-dependent inhibition of osteoclast formation, with varied effects on bone resorption (e.g., ciglitizone inhibited, L165041 stimulated resorption).

    Conclusions:

    • This study provides the first evidence of all PPAR isoforms' expression during human osteoclast development.
    • PPAR agonists exhibit significant control over osteoclast multinucleation and variable modulation of bone resorption.
    • PPARs represent promising therapeutic targets for conditions characterized by abnormal osteoclast activity.