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The tumor-modulatory effects of Caspase-2 and Pidd1 do not require the scaffold protein Raidd

L Peintner1, L Dorstyn2, S Kumar2

  • 1Division of Developmental Immunology, Medical University of Innsbruck, 6020 Innsbruck, Austria.

Cell Death and Differentiation
|April 11, 2015
PubMed

Insights

Receptor-interacting protein-associated ICH-1/CED-3 homologous protein with a death domain (RAIDD) does not influence c-Myc-driven lymphomagenesis or DNA-damage-induced cancer. RAIDD

Area of Science:

  • Molecular biology
  • Cell death regulation
  • Cancer research

Background:

  • Receptor-interacting protein-associated ICH-1/CED-3 homologous protein with a death domain (RAIDD) is a dual adaptor protein involved in inflammation and cell death.
  • RAIDD is a component of the PIDDosome complex, linking Caspase-2 and PIDD1, and has been implicated in apoptosis and tumorigenesis.
  • Caspase-2 acts as a tumor suppressor, while PIDD1 acts as a tumor promoter in the Emicro-Myc mouse lymphoma model.

Purpose of the Study:

  • To investigate the role of RAIDD in cancer, particularly in relation to Caspase-2 and PIDD1 functions.
  • To determine if RAIDD deficiency modulates lymphomagenesis or DNA-damage-induced cancer in mice.

Main Methods:

  • Analysis of Emicro-Myc/Raidd(-/-) mice to assess lymphomagenesis.
  • Evaluation of Raidd deficiency's effect on DNA-damage-driven cancer models.

Main Results:

  • Raidd deficiency did not protect against c-Myc-driven lymphomagenesis in Emicro-Myc/Raidd(-/-) mice.
  • Loss of Raidd did not significantly affect the onset or progression of DNA-damage-induced cancer.
  • The tumor suppressor role of Caspase-2 and the tumor promoter role of PIDD1 are independent of their interaction with the RAIDD scaffold.

Conclusions:

  • RAIDD does not play a significant role in modulating Caspase-2 or PIDD1 functions in the context of c-Myc-driven lymphomagenesis or DNA-damage-induced cancer.
  • Alternative signaling pathways likely mediate the tumor suppressor function of Caspase-2 and the tumor promoter function of PIDD1.

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