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Differential susceptibility to CD95 (Apo-1/Fas) and MHC class II-induced apoptosis during murine dendritic cell

A D McLellan1, G Terbeck, T Mengling

  • 1Department of Dermatology, University of Würzburg, Würzburg, Germany.

Cell Death and Differentiation
|March 30, 2001
PubMed

Insights

Antigen presenting cells (APCs), specifically dendritic cells (DCs), undergo distinct apoptosis pathways during maturation. Immature DCs are sensitive to CD95-induced cell death, while mature DCs resist CD95 but are sensitive to MHC class II-mediated apoptosis.

Area of Science:

  • Immunology
  • Cell Biology
  • Apoptosis Research

Background:

  • Antigen presenting cells (APCs) migrate to lymph nodes after interacting with T cells.
  • Understanding dendritic cell (DC) apoptosis regulation is crucial for immune response modulation.

Purpose of the Study:

  • To investigate the regulation of CD95 (Apo-1/Fas) induced apoptosis in murine dendritic cell (DC) development.
  • To differentiate apoptosis sensitivity in immature versus mature DCs.

Main Methods:

  • Cultured murine bone marrow cells to generate immature DCs.
  • Analyzed surface expression of CD95 and MHC class II on DCs.
  • Assessed apoptosis sensitivity to CD95L and MHC class II.
  • Utilized caspase inhibitors (zVAD-fmk) to study apoptosis pathways.

Main Results:

  • Immature DCs showed high sensitivity to CD95-induced apoptosis but were resistant to MHC class II-mediated apoptosis.
  • Mature DCs (splenic, epidermal, bone marrow-derived) were resistant to CD95-induced apoptosis but sensitive to MHC class II-mediated apoptosis.
  • Caspase activation was observed in immature DCs undergoing CD95L-induced apoptosis, but pan-caspase inhibition only partially affected cell death.

Conclusions:

  • CD95:CD95L ligation does not appear to be a major pathway for mature DC apoptosis.
  • Distinct apoptosis pathways regulate DC elimination at different maturation stages.
  • MHC class II-mediated apoptosis is significant for mature DC clearance.

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