Autoregulation of the N-myc gene is operative in neuroblastoma and involves histone deacetylase 2

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Marianne K H Kim1, William L Carroll

  • 1The Molecular, Cellular, Biochemical, and Developmental Sciences, Mount Sinai School of Medicine, New York, New York, USA.

Cancer
|September 24, 2004
PubMed
Abstract

Insights

Neuroblastoma’s N-myc gene autoregulation is intact in amplified cell lines and occurs via histone deacetylation, involving Mxi1 and HDAC2. This finding clarifies a key mechanism in aggressive tumor development.

Area of Science:

  • Molecular Biology
  • Cancer Genetics
  • Epigenetics

Background:

  • The myc gene family, including N-myc, is crucial in cell proliferation and is often dysregulated in cancer.
  • Autoregulation of myc genes is a negative feedback loop that normally limits Myc expression.
  • Loss of this autoregulation contributes to tumorigenesis, particularly in aggressive neuroblastoma with N-myc amplification.

Purpose of the Study:

  • To investigate the molecular mechanism of N-myc autoregulation in neuroblastoma.
  • To determine if the autoregulatory circuit is functional in N-myc amplified neuroblastoma cell lines.
  • To identify specific genes and epigenetic modifications involved in N-myc autoregulation.

Main Methods:

  • Transient reporter assays were used to assess the function of candidate genes (Mxi1, MBP-1, Miz, HDAC2).
  • Trichostatin A (TSA) was employed to investigate the role of histone deacetylases.
  • Chromatin immunoprecipitation (ChIP) was utilized to examine gene recruitment to the N-myc promoter.

Main Results:

  • The N-myc autoregulatory circuit was found to be operative even in N-myc amplified neuroblastoma cell lines.
  • Mxi1 and histone deacetylase 2 (HDAC2) were identified as key players, with their overexpression decreasing N-myc levels.
  • HDAC2 recruitment to the N-myc promoter increased upon N-myc down-regulation, and TSA treatment affected this process, indicating a role for histone deacetylation.

Conclusions:

  • The N-myc autoregulatory circuit is intact in both amplified and single-copy neuroblastoma cell lines.
  • Myc gene autoregulation in neuroblastoma proceeds through histone deacetylation, mediated by factors like HDAC2.
  • These findings provide critical insights into the molecular basis of aggressive neuroblastoma.

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