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Regulation of apoptosis by E1A and Myc oncoproteins

D G Breckenridge1, G C Shore

  • 1Department of Biochemistry, McGill University, Montreal, Quebec, Canada.

Critical Reviews in Eukaryotic Gene Expression
|March 29, 2001
PubMed

Insights

Oncogenes E1A and c-Myc trigger cell death (apoptosis) when cell cycle checkpoints are active. The p53 protein is crucial in this process, regulating genes involved in apoptosis.

Area of Science:

  • Molecular Biology
  • Oncology
  • Cell Biology

Background:

  • E1A and c-Myc are oncogenes that disrupt cell cycle regulation.
  • These oncoproteins promote cellular transformation when checkpoints are inactive.
  • When cell cycle checkpoints are intact, E1A and c-Myc induce apoptosis.

Purpose of the Study:

  • To review the upstream signaling events leading to apoptosis induced by E1A and c-Myc.
  • To discuss the ultimate apoptotic pathways activated by these oncoproteins.
  • To highlight the role of p53 in E1A and c-Myc-induced apoptosis.

Main Methods:

  • Literature review of studies on E1A, c-Myc, p53, and apoptosis.
  • Analysis of molecular mechanisms regulating cell cycle checkpoints.
  • Examination of transcriptional activation of apoptotic genes.

Main Results:

  • E1A and c-Myc induce apoptosis as a cellular response to uncontrolled growth signals.
  • p53 acts as a key regulator in the apoptosis pathway.
  • Cooperative action between p53 and oncoproteins may activate apoptotic machinery genes.

Conclusions:

  • The interplay between oncogenes and cell cycle checkpoints dictates cellular fate (transformation vs. apoptosis).
  • p53 plays a pivotal role in mediating the apoptotic response to oncogenic stress.
  • Understanding these pathways is crucial for cancer research and therapeutic development.

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