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Immunohistological Labeling of Microtubules in Sensory Neuron Dendrites, Tracheae, and Muscles in the Drosophila Larva Body Wall
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Dendrites of mitral cell neurons contain microtubules of opposite polarity

P R Burton1

  • 1Department of Physiology and Cell Biology, University of Kansas, Lawrence 66045.

Brain Research
|November 8, 1988
PubMed

Insights

Dendrites contain microtubules with mixed polarity, unlike axons. This suggests dendritic microtubules originate within dendrites, not the cell body, challenging previous neuron models.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Microtubule Dynamics

Background:

  • Axonal microtubules exhibit uniform polarity, originating from the neuron's cell body.
  • The polarity of microtubules within neuronal dendrites has remained largely uncharacterized.
  • Understanding microtubule polarity is crucial for neuronal structure and function.

Purpose of the Study:

  • To investigate the polarity of microtubules in the dendrites of bullfrog mitral cells.
  • To determine if dendritic microtubules share the uniform polarity observed in axons.

Main Methods:

  • A polarity assay was employed using tubulin-containing detergent medium to stabilize and label existing microtubules.
  • Microtubule polarity was assessed by observing the orientation of assembled tubulin ribbons ('hooks') in cross-section.
  • The study examined microtubules in dendrites and perikarya of olfactory bulb interneurons (mitral cells).

Main Results:

  • Mitral cell dendrites contain two populations of microtubules with opposite polarities.
  • This mixed polarity was observed in both proximal and distal dendritic regions.
  • The perikaryon also displayed a mixed population of microtubule polarities.

Conclusions:

  • Dendritic microtubules do not exhibit uniform polarity, differing from axonal microtubules.
  • It is hypothesized that dendritic microtubules originate from localized organizing centers within the dendrites.
  • Further research is needed to identify these potential dendritic microtubule organizing centers.

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