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Related Experiment Videos

Identification of Myc-mediated death response pathways by microarray analysis.

Qiang Yu1, Mei He, Norman H Lee

  • 1Advanced Technology Center, Center for Cancer Research, NCI/National Institutes of Health, Gaithersburg, MD 20877, USA.

The Journal of Biological Chemistry
|February 1, 2002
PubMed
Summary
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Myc

Area of Science:

  • Cellular Biology
  • Molecular Biology
  • Genetics

Background:

  • DNA damage can trigger programmed cell death (apoptosis).
  • The role of Myc in DNA damage-induced apoptosis is complex and not fully understood.
  • Understanding Myc's function is crucial for cancer research.

Purpose of the Study:

  • To elucidate the mechanisms of Myc-mediated apoptosis following DNA damage.
  • To identify genes regulated by Myc during the apoptotic process.
  • To investigate the interplay between Myc, p53, and apoptosis.

Main Methods:

  • Characterization of cell death kinetics in Rat-1 fibroblast cell lines with varying Myc levels (overexpressing, lacking, wild-type).
  • Exposure of cells to the DNA-damaging agent VP-16.

Related Experiment Videos

  • Gene expression profiling using microarray analysis to monitor changes.

    • Main Results:

    • Identified three distinct gene expression clusters during VP-16 exposure.
    • Cluster A genes were VP-16-dependent but Myc-independent and not linked to apoptosis.
    • Cluster B (p53-responsive genes) correlated with basal apoptosis onset.
    • Cluster C (including c-jun) was highly regulated by Myc and critical for maximal apoptosis.
    • Myc levels decreased upon VP-16 exposure, inversely correlating with Cluster C gene induction, suggesting Myc repression.

    Conclusions:

    • Myc negatively regulates a subset of genes critical for maximal apoptosis.
    • Myc accelerates the p53-responsive pathway, contributing to rapid cell death.
    • Removal of Myc-mediated repression, coupled with accelerated p53 signaling, drives complete and rapid apoptosis after DNA damage.