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Deubiquitinating activity of CYLD is impaired by SUMOylation in neuroblastoma cells

T Kobayashi1, K C Masoumi1, R Massoumi1

  • 1Translational Cancer Research, Division of Molecular Tumor Pathology, Department of Laboratory Medicine, Lund University, Lund, Sweden.

Oncogene
|June 10, 2014
PubMed

Insights

High CYLD expression predicts better neuroblastoma outcomes. Retinoic acid enhances CYLD, promoting differentiation via SUMOylation, while non-SUMOylatable CYLD induces cell death.

Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • CYLD is a deubiquitinating enzyme crucial for regulating NF-κB signaling.
  • Loss of CYLD function is linked to tumorigenesis and observed in various human cancers.
  • CYLD removes specific ubiquitin chains from key signaling proteins like TRAF2 and TRAF6.

Purpose of the Study:

  • To investigate the role of CYLD in neuroblastoma.
  • To explore the relationship between CYLD expression, patient survival, and disease stage.
  • To elucidate the impact of retinoic acid treatment on CYLD and its signaling pathways in neuroblastoma.

Main Methods:

  • Correlation analysis of CYLD expression with neuroblastoma patient survival and stage.
  • Investigation of CYLD expression and SUMOylation following retinoic acid treatment.
  • Functional studies using overexpression of wild-type and mutant CYLD in neuroblastoma cells.

Main Results:

  • High CYLD expression correlated with improved overall survival and relapse-free outcomes in neuroblastoma patients.
  • CYLD expression was inversely associated with neuroblastoma stage.
  • Retinoic acid treatment restored CYLD expression and induced its SUMOylation, which inhibited CYLD's deubiquitinase activity and promoted NF-κB signaling and differentiation.
  • Overexpression of a non-SUMOylatable CYLD mutant impaired retinoic acid-induced NF-κB activation and differentiation, leading to increased cell death.

Conclusions:

  • CYLD acts as a tumor suppressor in neuroblastoma, with high expression linked to favorable prognosis.
  • Retinoic acid-induced SUMOylation of CYLD is a key mechanism for promoting neuroblastoma differentiation by modulating NF-κB signaling.
  • Targeting CYLD SUMOylation may offer therapeutic strategies for neuroblastoma.

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