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p16/p14(ARF) cell cycle regulatory pathways in primary neuroblastoma: p16 expression is associated with advanced

M Omura-Minamisawa1, M B Diccianni, R C Chang

  • 1Department of Pediatrics/Hematology-Oncology, University of California San Diego Medical Center, 200 West Arbor Drive, San Diego, CA 92103, USA.

Clinical Cancer Research : an Official Journal of the American Association for Cancer Research
|November 14, 2001
PubMed

Insights

Up-regulated p16 expression is more common in aggressive neuroblastoma and linked to poorer survival. This suggests elevated p16 may be a unique marker for advanced disease.

Area of Science:

  • Molecular Biology
  • Oncology
  • Cell Cycle Regulation

Background:

  • The p16 protein is crucial for regulating the G(1)-S cell cycle transition by inhibiting cyclin D-cyclin-dependent kinase (CDK)4/CDK6-mediated phosphorylation of retinoblastoma protein (pRb).
  • Dysregulation of the p16-CDK/cyclin D-pRb pathway is implicated in various cancers, but its role in neuroblastoma, particularly concerning clinical outcome, requires further investigation.

Purpose of the Study:

  • To investigate potential derangements in the p16-CDK/cyclin D-pRb pathway in primary neuroblastomas.
  • To correlate findings with clinical stage and patient survival outcomes.
  • To determine if p16 expression is associated with aggressive neuroblastoma characteristics.

Main Methods:

  • Analysis of 40 primary neuroblastoma samples (18 unfavorable, 22 favorable stages).
  • Utilized Polymerase Chain Reaction (PCR), reverse transcription-PCR, Western blot, and immunohistochemistry.
  • Examined p16 gene alterations, mRNA and protein expression, and retinoblastoma protein (pRb) status.

Main Results:

  • No p16 gene alterations were detected in any samples.
  • Higher frequency of p16 mRNA and protein expression observed in unfavorable stage neuroblastomas compared to favorable stages (p=0.006 for mRNA, p=0.013 for protein).
  • pRb was deregulated in 82% of samples; pRb phosphorylation status did not correlate with p16 protein expression.
  • p16 expression significantly correlated with lower overall survival across all stages.
  • Infrequent events included MDM2 overexpression, p14(ARF) loss, and p53 mutation.

Conclusions:

  • Up-regulated p16 expression is a potential unique feature of aggressive neuroblastoma.
  • Elevated p16 protein may not function properly in regulating the cell cycle pathway in these tumors.
  • p16 expression serves as a significant prognostic marker associated with reduced survival in neuroblastoma patients.

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