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Related Experiment Videos

Functional Fas expression in human thymic epithelial cells.

N Moulian1, C Renvoizé, C Desodt

  • 1CNRS UPRESA, Hôpital Marie-Lannelongue, Le Plessis Robinson, France.

Blood
|April 9, 1999
PubMed
Summary
This summary is machine-generated.

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Fas receptor is present in human thymus medullary epithelial cells and can trigger apoptosis. Thymic epithelial cells develop resistance to Fas-induced cell death in culture, but this can be reversed by specific treatments.

Area of Science:

  • Immunology
  • Cell Biology
  • Thymic Epithelial Cell Biology

Background:

  • Fas receptor (Fas) mediates apoptosis upon ligand binding.
  • Medullary epithelial cells of the human thymus constitutively express Fas.
  • Thymic epithelial cells (TEC) exhibit altered Fas expression and apoptosis sensitivity during in vitro culture.

Purpose of the Study:

  • To investigate the expression and function of Fas in human thymic epithelial cells.
  • To understand the mechanisms underlying resistance to Fas-induced apoptosis in cultured TEC.
  • To determine if cytokines and cell-cell interactions can restore Fas-mediated apoptosis in TEC.

Main Methods:

  • Immunohistochemistry for Fas expression in thymus.
  • Primary and subcultures of human TEC.

Related Experiment Videos

  • Treatment with anti-Fas antibodies, cycloheximide, and cytokines (IL-1β, TNF-α, IFN-γ).
  • Assessment of Fas mRNA and protein levels, apoptosis assays, and caspase activity measurement.

    • Main Results:

    • Fas is constitutively expressed in medullary TEC.
    • TEC resistance to Fas-induced apoptosis emerges in primary culture and is linked to Fas-associated phosphatase-1.
    • Cytokines and co-culture with thymocytes restore Fas expression and sensitivity to apoptosis in TEC.
    • Apoptosis induction involves caspase pathways but is not solely dependent on DEVDase activity.

    Conclusions:

    • Fas receptor is functionally expressed in human thymic medullary epithelial cells.
    • TEC modulate their sensitivity to Fas-induced apoptosis during culture.
    • Cytokine signaling and thymocyte interactions are critical for regulating Fas-mediated apoptosis in TEC.