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IAP antagonists induce autoubiquitination of c-IAPs, NF-kappaB activation, and TNFalpha-dependent apoptosis

Eugene Varfolomeev1, John W Blankenship, Sarah M Wayson

  • 1Department of Protein Engineering, Genentech, Inc., South San Francisco, CA 94080, USA.

Cell
|November 21, 2007
PubMed

Insights

Small-molecule antagonists targeting inhibitor of apoptosis (IAP) proteins induce cancer cell death by triggering auto-ubiquitination and degradation of c-IAPs. These IAP antagonists also impact TNF signaling and NF-kappaB pathway regulation.

Area of Science:

  • Biochemistry
  • Molecular Biology
  • Oncology

Background:

  • Inhibitor of apoptosis (IAP) proteins are crucial regulators of cell death, often overexpressed in cancers.
  • IAPs present attractive targets for novel cancer therapeutic strategies.

Purpose of the Study:

  • To investigate the mechanism of action for small-molecule IAP antagonists.
  • To elucidate the role of c-IAP proteins in cell death and signaling pathways.

Main Methods:

  • Treatment of cells with small-molecule IAP antagonists.
  • Analysis of protein ubiquitination and degradation via proteasomal pathways.
  • Assessment of cell death induction, TNF signaling, and NF-kappaB pathway activity.

Main Results:

  • Small-molecule IAP antagonists induce auto-ubiquitination and degradation of c-IAPs.
  • IAP antagonists trigger TNF-dependent and protein biosynthesis-dependent cell death.
  • c-IAP1 and c-IAP2 regulate NF-kappaB signaling by promoting NIK degradation.

Conclusions:

  • Small-molecule IAP antagonists represent a promising therapeutic approach for cancer treatment.
  • Targeting IAPs can induce cancer cell death and modulate critical signaling pathways like NF-kappaB.

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