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Measuring Composition of CD95 Death-Inducing Signaling Complex and Processing of Procaspase-8 in this Complex
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CD95 ligation and intracellular membrane flow.

Roland Reinehr1, Dieter Häussinger

  • 1Clinic for Gastroenterology, Hepatology and Infectiology, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany.

The Biochemical Journal
|July 11, 2008
PubMed
Summary

CD95 death receptor activation triggers apoptosis differently in type I and type II cells. Type II cells show a novel caspase-independent endocytosis pathway involving mitochondria, suggesting complex organelle interactions in cell death signaling.

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Biochemistry

Background:

  • CD95 (APO-1/Fas) receptor ligation initiates apoptosis through distinct pathways in type I and type II cells.
  • Type I cells directly activate caspases, while type II cells require mitochondrial amplification.
  • Ceramide and receptor trafficking are crucial in CD95-mediated apoptosis.

Purpose of the Study:

  • To elucidate the complex intracellular membrane dynamics following CD95 receptor activation in type II cells.
  • To investigate the role of endocytosis and organelle interactions in CD95-mediated apoptosis.

Main Methods:

  • Analysis of CD95 receptor trafficking and DISC formation.
  • Investigation of intracellular membrane flow, including Golgi and mitochondrial interactions.
  • Assessment of caspase-dependent and -independent endocytosis pathways.

Main Results:

  • CD95 ligation in type II cells involves caspase-8-dependent endosomal acidification and ceramide-mediated receptor recruitment.
  • A novel caspase-independent endocytosis pathway with vesicle translocation to mitochondria was observed in type II cells.
  • Evidence suggests "organelle scrambling" and complex interplay between Golgi and mitochondria post-CD95 activation.

Conclusions:

  • CD95-mediated apoptosis involves intricate and cell-type-specific regulation of intracellular membrane trafficking.
  • Early events following CD95 activation in type II cells reveal a complex interplay between endocytosis, mitochondria, and Golgi.
  • Further research is needed to fully understand the signaling mechanisms and roles of these organelle interactions in apoptosis.