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Measuring Composition of CD95 Death-Inducing Signaling Complex and Processing of Procaspase-8 in this Complex
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Measuring Composition of CD95 Death-Inducing Signaling Complex and Processing of Procaspase-8 in this Complex

Published on: August 2, 2021

[cFLIP diminishes CD95-induced apoptosis of CD30-stimulated cutaneous anaplastic large T cell lymphoma (cALCL) cells]

B Hirsch1, F K Braun, N Al-Yacoub

  • 1Institut für Pathologie, Charité-Universitätsmedizin Berlin, Campus Benjamin Franklin, Hindenburgdamm 30, 12203 Berlin. burkhard.hirsch@charite.de

Der Pathologe
|September 3, 2010
PubMed

Insights

CD30 receptor stimulation upregulates cFLIP, enhancing resistance to CD95-mediated apoptosis in cALCL cells. Inhibiting cFLIP restores apoptosis sensitivity, suggesting caution with CD30 antibody therapies for ALCL.

Area of Science:

  • Immunology
  • Molecular Biology
  • Cancer Research

Background:

  • Tumor necrosis factor (TNF) receptors CD30 and CD95 have opposing effects.
  • The crosstalk between CD30 and CD95 signaling is not well understood.
  • Understanding this interaction is crucial for ALCL (anaplastic large cell lymphoma) pathogenesis and therapy.

Purpose of the Study:

  • To investigate the regulatory mechanisms of CD30-induced effects on CD95 signaling in cALCL cell lines.
  • To elucidate the crosstalk between CD30 and CD95 signaling pathways.
  • To determine the role of cFLIP in CD30/CD95 crosstalk and apoptosis resistance.

Main Methods:

  • Flow cytometry was used to assess receptor expression and apoptosis induction.
  • RT-RQ-PCR and immunoblotting analyzed mRNA and protein expression of key signaling molecules (cFLIP, TRAF1, IκBα, caspases).
  • Lentiviral shRNA mediated knockdown of cFLIP to assess its functional role.

Main Results:

  • CD30 ligation induced NFκB-mediated upregulation of cFLIP in cALCL cells.
  • Upregulated cFLIP conferred resistance to CD95-mediated apoptosis.
  • Knockdown of cFLIP restored sensitivity to CD95-induced apoptosis, confirming cFLIP's critical role.

Conclusions:

  • CD30 signaling promotes apoptosis resistance in cALCL cells via cFLIP upregulation.
  • The anti-apoptotic function of CD30 antibodies warrants consideration in therapeutic strategies for ALCL.
  • Targeting cFLIP may represent a therapeutic avenue for overcoming resistance in ALCL.

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