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Apoptosis induced by death receptors.

P Schneider1, J Tschopp

  • 1Institute of Biochemistry, University of Lausanne, Epalinges, Switzerland. pascal.schneider@ib.unil.ch

Pharmaceutica Acta Helvetiae
|May 17, 2000
PubMed
Summary

Death receptors initiate apoptosis via ligand binding and aggregation. Modulating ligand status, decoy receptors, and intracellular proteins like FLIP are key to controlling this cell death pathway.

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Area of Science:

  • Cell Biology
  • Immunology
  • Molecular Biology

Background:

  • Death receptors, part of the TNF receptor superfamily, possess intracellular death domains crucial for recruiting adapter proteins and initiating apoptosis.
  • Ligand binding to death receptors, typically homotrimeric TNF family members, triggers downstream signaling cascades.
  • Regulation of death receptor activation is complex, involving ligand form, decoy receptors, and intracellular modulators.

Purpose of the Study:

  • To elucidate the mechanisms regulating death receptor-mediated apoptosis.
  • To explore the roles of ligand status, decoy receptors, and intracellular proteins in modulating apoptosis signaling.
  • To understand how these factors influence cytotoxic activity and downstream pathways like NF-kappa B.

Main Methods:

  • Analysis of ligand-receptor interactions, including membrane-bound versus soluble forms (e.g., FasL, TRAIL).
  • Investigation of decoy receptor function (e.g., TRAIL-R3) in inhibiting apoptosis.
  • Examination of intracellular protein interactions (e.g., FLIP) with apoptotic pathway components.

Main Results:

  • Soluble FasL (sFasL) binding to Fas is less cytotoxic than membrane-bound FasL, requiring aggregation of multiple Fas molecules for efficient apoptosis signaling.
  • Decoy receptors like TRAIL-R3 can act as dominant-negative inhibitors of TRAIL-mediated apoptosis.
  • FLIP, a Caspase-8 homolog, inhibits death receptor-induced apoptosis while potentially activating other pathways like NF-kappa B.

Conclusions:

  • Death receptor activation and apoptosis are tightly regulated by multiple mechanisms.
  • Ligand aggregation state and decoy receptors are critical for controlling cytotoxic signaling.
  • Intracellular proteins offer further regulatory points, influencing both apoptosis and other cellular pathways.

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