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Related Experiment Videos

Actin polymerization modulates CD44 surface expression, MMP-9 activation, and osteoclast function.

V Samanna1, T Ma, T W Mak

  • 1Department of Biomedical Sciences, Dental School, University of Maryland, Baltimore, Maryland 21201, USA.

Journal of Cellular Physiology
|May 18, 2007
PubMed
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Actin polymerization is crucial for CD44 surface expression and MMP-9 activity in osteoclasts. Inhibiting actin polymerization with alendronate or cytochalasin D reduces CD44/MMP-9 complex formation, impacting cell migration and bone resorption.

Area of Science:

  • Cell Biology
  • Biochemistry
  • Osteoclast Biology

Background:

  • CD44 and MMP-9 are key proteins involved in cell migration.
  • Osteoclast function, including migration and bone resorption, is essential for skeletal remodeling.
  • Actin cytoskeleton dynamics play a critical role in various cellular processes.

Purpose of the Study:

  • To investigate the role of actin polymerization in CD44 surface expression and MMP-9 activity on osteoclasts.
  • To elucidate the molecular mechanisms linking actin polymerization to CD44 and MMP-9 function.
  • To determine the effect of bisphosphonates and actin polymerization inhibitors on osteoclast migration and bone resorption.

Main Methods:

  • Osteoclasts were treated with alendronate (a bisphosphonate), cytochalasin D (an actin polymerization inhibitor), and GM6001 (an MMP inhibitor).

Related Experiment Videos

  • CD44 surface expression, MMP-9 activity, and localization were assessed.
  • Osteoclast migration and bone resorption assays were performed.

    • Main Results:

    • Actin polymerization is critical for CD44 surface expression and osteoclast function.
    • Alendronate and cytochalasin D reduced CD44 surface expression and MMP-9 membrane activity.
    • GM6001 inhibited MMP-9 activity and bone resorption but did not affect CD44 surface levels.
    • Disruption of actin structures by alendronate and Cyt D reduced MMP-9 localization, osteoclast migration, and bone resorption.

    Conclusions:

    • Actin polymerization is required for the surface expression of CD44 and the membrane activity of MMP-9 in osteoclasts.
    • Alendronate and cytochalasin D inhibit osteoclast migration and bone resorption by disrupting actin polymerization and CD44/MMP-9 complex formation.
    • CD44/MMP-9 complex formation may represent a significant signaling pathway for osteoclast motility.