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Related Experiment Videos

Actin depolymerizing factor and cofilin phosphorylation dynamics: response to signals that regulate neurite extension

P J Meberg1, S Ono, L S Minamide

  • 1Department of Biochemistry and Molecular Biology, Colorado State University, Fort Collins 80523-1870, USA.

Cell Motility and the Cytoskeleton
|March 4, 1998
PubMed
Summary

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Phosphorylation inhibits actin depolymerizing factor (ADF)/cofilin activity. Dephosphorylation, triggered by calcium or cAMP, promotes neuronal process extension, revealing key signaling pathways for actin dynamics.

Area of Science:

  • Cell Biology
  • Neuroscience
  • Biochemistry

Background:

  • Actin depolymerizing factor (ADF)/cofilin regulates actin assembly, crucial for cell structure and motility.
  • Phosphorylation inhibits ADF/cofilin activity, while dephosphorylation activates it.
  • Understanding the regulation of ADF/cofilin phosphorylation is key to deciphering signaling pathways involved in neuronal development.

Purpose of the Study:

  • To characterize signaling pathways and phosphatases that activate phosphorylated ADF (pADF), focusing on neuronal process extension.
  • To investigate the role of calcium and cAMP in regulating pADF dephosphorylation.
  • To explore the impact of growth factors like NGF and insulin on ADF/cofilin phosphorylation dynamics.

Main Methods:

  • Western blotting with specific antibodies to measure ADF/cofilin phosphorylation.

Related Experiment Videos

  • Utilizing inhibitors and signaling agents to modulate intracellular calcium and cAMP levels.
  • Observing ADF/cofilin translocation in response to growth factor stimulation.

    • Main Results:

    • Increased intracellular calcium ([Ca2+]i) and cAMP levels rapidly dephosphorylated ADF/cofilin.
    • Calcium-dependent dephosphorylation involved protein phosphatase 2B (PP2B), while cAMP-dependent dephosphorylation involved protein phosphatase 1 (PP1).
    • Growth factors (NGF, insulin) induced rapid dephosphorylation and enhanced phosphate turnover, sometimes without altering net phosphorylation levels.
    • Dephosphorylation of pADF correlated with increased neuronal process extension, while increased pADF levels inhibited it.

    Conclusions:

    • Dephosphorylation and activation of pADF are significant responses to signaling pathways that regulate actin dynamics and neuronal outgrowth.
    • ADF/cofilin phosphorylation dynamics are coordinately regulated by intracellular signals.
    • Targeting ADF/cofilin dephosphorylation pathways offers potential for modulating neuronal morphology and growth.