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Related Experiment Videos

Microtubule stabilization specifies initial neuronal polarization.

Harald Witte1, Dorothee Neukirchen, Frank Bradke

  • 1Axonal Growth and Regeneration, Max Planck Institute of Neurobiology, 82152 Martinsried, Germany.

The Journal of Cell Biology
|February 13, 2008
PubMed
Summary
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Microtubule dynamics are crucial for neuronal polarization. Stabilizing microtubules in one neurite promotes axon formation, highlighting their role in establishing neuronal polarity.

Area of Science:

  • Neuroscience
  • Cell Biology

Background:

  • Neuronal polarity is established during axon formation.
  • Microtubule dynamics are implicated in cell polarization but their specific role in axonogenesis is unclear.

Purpose of the Study:

  • To investigate the role of microtubule dynamics in neuronal polarization.
  • To determine if altering microtubule dynamics can influence axon formation.

Main Methods:

  • Cultured hippocampal neurons were used to observe microtubule stability and turnover.
  • Neuronal polarity regulators, synapses of amphids defective (SAD) kinases, and glycogen synthase kinase-3beta were manipulated.
  • Microtubule dynamics were altered using nocodazole and taxol, including a photoactivatable taxol analogue.

Main Results:

Related Experiment Videos

  • Increased microtubule stability was observed in the single neurite before axon formation and in the axon of polarized cells.
  • Manipulation of polarity regulators and changes in microtubule turnover correlated with loss of polarity or multiple axon formation.
  • Nocodazole reduced dendrite formation, while taxol promoted multiple axon formation.
  • Local stabilization of microtubules induced axon formation.

Conclusions:

  • Microtubule dynamics play a critical role in specifying neuronal polarity.
  • Local microtubule stabilization in a single neurite acts as a physiological signal for axon formation.