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Related Experiment Videos

Cell cycle and death control: long live Forkheads.

Boudewijn M T Burgering1, Geert J P L Kops

  • 1Dept Physiological Chemistry and Centre for Biomedical Genetics, University Medical Centre Utrecht, Stratenum, The Netherlands. b.m.t.burgering@med.uu.nl

Trends in Biochemical Sciences
|July 13, 2002
PubMed
Summary

The phosphoinositide-3-kinase-protein-kinase-B (PI3K-PKB/c-Akt) pathway regulates FOXO transcription factors, impacting cell functions. This conserved pathway influences lifespan and development in organisms like C. elegans and may affect similar processes in higher eukaryotes.

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Area of Science:

  • Molecular Biology
  • Cell Biology
  • Genetics

Background:

  • The FOXO family of transcription factors (FOXO1, FOXO3a, FOXO4) plays a crucial role in regulating cellular processes.
  • These factors are key targets of the phosphoinositide-3-kinase-protein-kinase-B (PI3K-PKB/c-Akt) signaling pathway.
  • PKB-mediated phosphorylation leads to FOXO inactivation and cytoplasmic localization, thereby controlling gene expression.

Purpose of the Study:

  • To elucidate the regulatory mechanisms of the PI3K-PKB/c-Akt pathway on FOXO transcription factors.
  • To explore the conserved functions of this pathway across different species.
  • To investigate the potential role of the PI3K-PKB-FOXO pathway in higher eukaryotes.

Main Methods:

  • Review of existing literature on FOXO transcription factors and PI3K-PKB/c-Akt signaling.

Related Experiment Videos

  • Comparative analysis of pathway conservation in model organisms, including C. elegans.
  • Exploration of FOXO-regulated gene functions in cell cycle, cell death, metabolism, and oxidative stress.

    • Main Results:

    • The PI3K-PKB/c-Akt pathway directly phosphorylates and inactivates FOXO transcription factors.
    • FOXO-regulated genes are critical for cell cycle control, apoptosis, metabolism, and oxidative stress response.
    • The pathway's role in regulating lifespan and dauer formation in C. elegans highlights its evolutionary conservation.

    Conclusions:

    • The PI3K-PKB-FOXO signaling axis is a fundamental pathway conserved across evolution.
    • Understanding this pathway provides insights into cellular regulation and potential therapeutic targets.
    • Further research is warranted to fully understand the implications of this pathway in higher eukaryotes.