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Related Experiment Videos

[Human monocyte-derived multinucleated giant cells].

Hiroyuki Okamoto1, Kana Mizuno, Takeshi Horio

  • 1Department of Dermatology, Kansai Medical University, Moriguchi, Osaka, Japan. hokamoto@takii.kmu.ac.jp

Nihon Hansenbyo Gakkai Zasshi = Japanese Journal of Leprosy : Official Organ of the Japanese Leprosy Association
|October 29, 2004
PubMed
Summary

Multinucleated giant cells (MGC) are key in granulomatous diseases. An in vitro model using peripheral blood cells reveals cytokines like IFN-gamma drive MGC formation, aiding research into diseases such as sarcoidosis.

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Area of Science:

  • Immunology
  • Cell Biology

Background:

  • Multinucleated giant cells (MGC) are hallmarks of granulomatous disorders like sarcoidosis and leprosy.
  • Two MGC types exist: foreign body-type and Langhans-type cells.
  • The precise formation mechanisms and functional roles of MGC remain unclear despite well-understood morphology.

Purpose of the Study:

  • To investigate the mechanisms of MGC formation in vitro.
  • To explore the role of cytokines and pathogen-derived factors in MGC development.
  • To evaluate the utility of an in vitro MGC formation model for understanding granulomatous diseases.

Main Methods:

  • Peripheral blood mononuclear cells were stimulated in vitro to induce MGC formation.
  • The roles of various cytokines (IFN-gamma, IL-3, IL-4, IL-13, GM-CSF) and muramyl dipeptide were assessed.

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  • Involvement of cell surface molecules (P2X7 receptor, integrins, CD98, macrophage fusion protein) was examined.
  • Monocytes from sarcoidosis patients were compared to healthy controls.

    • Main Results:

    • Cytokines, particularly IFN-gamma, are crucial for monocyte fusion and MGC formation.
    • Muramyl dipeptide can induce Langhans-type MGC formation.
    • Specific cell surface molecules are implicated in the fusion process.
    • Sarcoidosis patient monocytes exhibit heightened P2X7 expression and MGC-inducing capacity.
    • Therapeutic agents for sarcoidosis (tranilast, allopurinol, captopril) inhibit in vitro MGC formation.

    Conclusions:

    • An in vitro MGC formation model provides insights into MGC relevance in granulomatous disorders.
    • Cytokines and pathogen-derived factors significantly influence MGC development.
    • The P2X7 receptor and other cell surface molecules play roles in MGC formation.
    • Inhibitory effects of sarcoidosis drugs on MGC formation suggest direct therapeutic mechanisms on monocytes.