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The scavenger receptor CD36 plays a role in cytokine-induced macrophage fusion

Laura Helming1, Julia Winter, Siamon Gordon

  • 1Sir William Dunn School of Pathology, University of Oxford, South Parks Road, Oxford OX1 3RE, UK.

Journal of Cell Science
|January 22, 2009
PubMed

Insights

The scavenger receptor CD36 is crucial for cytokine-induced macrophage fusion, a process vital for forming multinucleated giant cells in infections. This fusion requires cell surface lipid exposure and CD36

Area of Science:

  • Immunology
  • Cell Biology
  • Infectious Diseases

Background:

  • Multinucleated giant cells are hallmarks of granulomatous infections.
  • These cells form through the fusion of macrophages.

Purpose of the Study:

  • To identify molecular mechanisms underlying cytokine-induced macrophage fusion.
  • To investigate the role of scavenger receptor CD36 in giant cell formation.

Main Methods:

  • Antibody screening strategy to identify key molecules.
  • Analysis of phosphatidylserine exposure and lipid recognition.
  • Assessment of CD36's role in heterotypic fusion and osteoclast formation.

Main Results:

  • The scavenger receptor CD36 mediates macrophage fusion induced by IL-4 and GM-CSF.
  • Cytokine-induced fusion necessitates phosphatidylserine exposure and CD36-mediated lipid recognition.
  • CD36 functions heterotypically in giant cell formation, but not in osteoclast development.

Conclusions:

  • CD36 is a key mediator of cytokine-induced macrophage fusion.
  • Lipid capture by cell surface receptors may be a general mechanism for cell fusion.
  • Understanding these pathways can elucidate the functional significance of multinucleated giant cells.

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