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A conserved PTEN/FOXO pathway regulates neuronal morphology during C. elegans development

Ryan Christensen1, Luis de la Torre-Ubieta, Azad Bonni

  • 1Program in Cellular Neuroscience, Neurodegeneration and Repair, Department of Cell Biology, Yale University School of Medicine, P.O. Box 9812, New Haven, CT 06536-0812, USA.

Development (Cambridge, England)
|November 10, 2011
PubMed

Insights

The lipid phosphatase DAF-18/PTEN promotes neurite outgrowth by activating the DAF-16/FOXO pathway during nervous system development. This conserved mechanism highlights a novel role for PI3K signaling in regulating neuron morphology.

Area of Science:

  • Neuroscience
  • Molecular Biology
  • Developmental Biology

Background:

  • The phosphatidylinositol 3-kinase (PI3K) signaling pathway is crucial for nervous system development.
  • DAF-18/PTEN acts as a key negative regulator of PI3K signaling.
  • Understanding PI3K pathway regulation is vital for comprehending neurodevelopmental processes.

Purpose of the Study:

  • To investigate the novel role of DAF-18/PTEN in neurodevelopment.
  • To elucidate the mechanism by which DAF-18/PTEN influences neurite outgrowth.
  • To determine the involvement of DAF-16/FOXO in DAF-18-mediated neuronal development.

Main Methods:

  • Utilized Caenorhabditis elegans as a model organism.
  • Investigated the modulation of the PI3K signaling pathway by DAF-18.
  • Examined the activation of DAF-16/FOXO isoforms and their impact on neurite outgrowth.
  • Assessed the conservation of DAF-16/FOXO's role in mammalian neurons.

Main Results:

  • Identified a novel function for DAF-18 in promoting neurite outgrowth during development.
  • Demonstrated that DAF-18 activates DAF-16/FOXO to facilitate developmental neurite outgrowth.
  • Found that the DAF-16B isoform, but not other isoforms, mediates this outgrowth-promoting activity.
  • Confirmed the conserved role of DAF-16/FOXO in regulating neuron morphology in mammalian systems.

Conclusions:

  • DAF-18/PTEN plays a novel role in promoting neurite outgrowth via PI3K-DAF-16/FOXO signaling.
  • Isoform-specific activity of DAF-16/FOXO is critical for regulating neuronal morphology.
  • This conserved pathway offers new insights into the molecular mechanisms of neurodevelopment.

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