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CCM2 mediates death signaling by the TrkA receptor tyrosine kinase

Liraz Harel1, Barbara Costa, Marianna Tcherpakov

  • 1Department of Biological Chemistry, Weizmann Institute of Science, 76100 Rehovot, Israel.

Neuron
|September 17, 2009
PubMed

Insights

CCM2 interacts with TrkA receptor tyrosine kinase, mediating its cell death-inducing function in pediatric neural tumors. High CCM2 and TrkA levels correlate with better neuroblastoma patient survival.

Area of Science:

  • Molecular Biology
  • Oncology
  • Neuroscience

Background:

  • The TrkA receptor tyrosine kinase is vital for neuronal development and survival.
  • TrkA paradoxically induces cell death in pediatric neural tumors through an uncharacterized mechanism.

Purpose of the Study:

  • To elucidate the mechanism by which TrkA induces cell death in pediatric neural tumors.
  • To identify key mediators of TrkA-dependent cell death in neuroblastic tumors.

Main Methods:

  • Investigated the interaction between CCM2 and TrkA using biochemical assays.
  • Assessed the role of CCM2 domains (PTB and Karet) in TrkA-mediated cell death.
  • Examined the effect of CCM2 downregulation in medulloblastoma and neuroblastoma cell lines.
  • Correlated CCM2 and TrkA expression with patient survival data.

Main Results:

  • CCM2 interacts with the juxtamembrane region of TrkA via its phosphotyrosine binding (PTB) domain.
  • Both PTB and Karet domains of CCM2 are essential for TrkA-dependent cell death.
  • Downregulation of CCM2 reduces TrkA-induced death in medulloblastoma and neuroblastoma cells.
  • High CCM2 and TrkA expression correlates with improved survival in neuroblastoma patients.

Conclusions:

  • CCM2 is a critical mediator of TrkA-dependent cell death in pediatric neuroblastic tumors.
  • CCM2's PTB domain specifies TrkA interaction, while its Karet domain links to death pathways.
  • CCM2 and TrkA represent potential therapeutic targets for neuroblastic tumors.

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