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E2F-1 regulates expression of FOXO1 and FOXO3a

Katrin Nowak1, Katrin Killmer, Christine Gessner

  • 1Institute of Molecular Biology and Tumor Research (IMT), Emil-Mannkopff-Strasse 2, 35033 Marburg, Germany.

Biochimica Et Biophysica Acta
|May 8, 2007
PubMed

Insights

E2F-1 transcription factor induces FOXO gene expression, linking these proteins in neuronal apoptosis control. However, this induction does not occur during E2F-1-mediated neuronal cell death.

Area of Science:

  • Molecular Biology
  • Neuroscience
  • Cell Biology

Background:

  • E2F and FOXO transcription factors regulate neuronal apoptosis.
  • The kinase Akt inhibits both E2F-induced apoptosis and FOXO function.

Purpose of the Study:

  • To investigate if FOXO is a downstream target of E2F-1 in neuronal apoptosis.
  • To elucidate the regulatory relationship between E2F-1 and FOXO proteins in controlling neuronal cell fate.

Main Methods:

  • Assessed endogenous FOXO1 and FOXO3a expression following E2F-1 induction.
  • Utilized reporter assays to examine E2F-1's activation of the FOXO1 promoter.
  • Performed in vivo binding assays to confirm E2F-1 interaction with the FOXO1 promoter.
  • Analyzed FOXO expression during E2F-1-mediated apoptosis in PC12 cells.

Main Results:

  • E2F-1 was found to induce endogenous FOXO1 and FOXO3a expression.
  • Evidence suggests FOXO genes are direct transcriptional targets of E2F-1.
  • E2F-1 activated the FOXO1 promoter and bound to it in vivo.
  • Transcriptional induction of FOXO was not observed during E2F-1-dependent neuronal apoptosis.

Conclusions:

  • E2F-1 is identified as a novel transcription factor that regulates FOXO expression.
  • This study establishes a link between E2F and FOXO proteins in the regulation of neuronal cell fate.
  • The findings highlight a complex interplay between E2F-1, FOXO, and neuronal apoptosis pathways.

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