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CIAP2 inhibits anigen receptor signaling by targeting Bcl10 for degredation

Shimin Hu1, Allison Alcivar, Like Qu

  • 1Abramson Family Cancer Research Institute and Department of Cancer Biology, University of Pennsylvania School of Medicine, Philadelphia, Pennsylvania, USA.

Cell Cycle (Georgetown, Tex.)
|June 16, 2006
PubMed

Insights

Cellular inhibitor of apoptosis 2 (cIAP2) normally degrades Bcl10 to inhibit lymphocyte signaling. Its fusion with MALT1 in lymphomas prevents Bcl10 degradation, enhancing NF-kappaB activation and promoting MALT lymphoma.

Area of Science:

  • Immunology
  • Molecular Biology
  • Oncology

Background:

  • Cellular inhibitor of apoptosis 2 (cIAP2) is a ubiquitin ligase implicated in MALT lymphomas via t(11;18) translocation.
  • The role of cIAP2 in lymphocyte physiology and its alteration in MALT lymphomas are not fully understood.

Purpose of the Study:

  • To elucidate the physiological function of cIAP2 in lymphocytes.
  • To investigate how the cIAP2-MALT1 fusion impacts cellular signaling in MALT lymphomas.

Main Methods:

  • Investigated cIAP2's role in antigen receptor signaling.
  • Analyzed the ubiquitination and degradation of Bcl10 by cIAP2.
  • Examined the functional consequences of the cIAP2-MALT1 fusion protein on NF-kappaB activation.

Main Results:

  • cIAP2 normally inhibits antigen receptor signaling by ubiquitinating and degrading Bcl10.
  • The cIAP2-MALT1 fusion protein lacks E3 ligase activity, leading to Bcl10 accumulation.
  • cIAP2-MALT1 and Bcl10 synergistically activate NF-kappaB signaling.

Conclusions:

  • Revealed a novel physiological function of cIAP2 in regulating lymphocyte signaling.
  • Identified Bcl10 upregulation as a key molecular mechanism in MALT lymphomas.
  • Defined the pathogenic mechanism of the cIAP2-MALT1 fusion in t(11;18)-positive MALT lymphomas.

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