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Death and decoy receptors and p53-mediated apoptosis

M S Sheikh1, A J Fornace

  • 1Department of Pharmacology, SUNY Upstate Medical University, Syracuse, New York 13210, USA.

Leukemia
|August 15, 2000
PubMed

Insights

The tumor suppressor p53 influences apoptosis by regulating death receptors like DR5 and decoy receptors. Decoy receptors may counteract p53

Area of Science:

  • Molecular Biology
  • Cell Biology
  • Cancer Research

Background:

  • Discovery of tumor necrosis factor receptor 1 (TNF-R1) and Fas-related death receptors (DR3, DR4, DR5, DR6) involved in apoptosis.
  • Identification of decoy receptors (DcR1/TRID, DcR2/TRUNDD, DcR3, OPG) that inhibit ligand-induced apoptosis by competing for ligand binding.
  • The tumor suppressor p53 is known to regulate apoptosis.

Purpose of the Study:

  • To investigate the role of p53 in regulating both death receptors and decoy receptors.
  • To explore how p53-mediated regulation of these receptors impacts apoptosis.
  • To understand the potential counteracting effects of decoy receptors on p53-induced apoptosis.

Main Methods:

  • Analysis of p53's influence on the expression of death receptors (Fas, DR5).
  • Investigation of p53's regulation of TRAIL decoy receptors (DcR1/TRID, DR2/TRUNDD).
  • Assessment of the functional significance of p53-dependent decoy receptor regulation in apoptosis.

Main Results:

  • Evidence suggests p53 upregulates death receptors Fas and DR5, potentially mediating apoptosis.
  • p53 also regulates the expression of decoy receptors DcR1/TRID and DR2/TRUNDD.
  • DcR1/TRUNDD appears to inhibit p53-mediated apoptosis, suggesting a potential mechanism for p53 to modulate its own apoptotic effects.

Conclusions:

  • p53's role in apoptosis is complex, involving the regulation of both pro-apoptotic death receptors and anti-apoptotic decoy receptors.
  • p53 may potentially attenuate its own DR5-dependent apoptotic signaling by controlling decoy receptor levels.
  • Further research is needed to fully elucidate the significance of p53-dependent decoy receptor regulation.

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