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Related Experiment Videos

Vasoactive intestinal polypeptide immunoreactive structures in the mouse barrel field

K Zilles1, F Hajós, A Csillag

  • 1C. & O. Vogt Institute for Brain Research, University of Düsseldorf, Germany.

Brain Research
|July 30, 1993
PubMed
Summary

Vasoactive intestinal polypeptide axon terminals show a modular distribution in the mouse barrel cortex. These terminals are concentrated in the sides of barrel structures, not the hollows, revealing a novel cortical organization pattern.

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Area of Science:

  • Neuroscience
  • Cortical organization
  • Neocortical circuitry

Background:

  • The barrel cortex is a key somatosensory processing area in rodents.
  • The role of specific neurotransmitters in neocortical modularity is not fully understood.

Purpose of the Study:

  • To investigate the distribution of vasoactive intestinal polypeptide (VIP)-containing axon terminals in the mouse barrel cortex.
  • To determine if VIPergic innervation correlates with the barrel structure.

Main Methods:

  • Immunohistochemistry was used to visualize VIP-containing axon terminals.
  • Tangential vibratome sections of the adult mouse barrel cortex were analyzed.
  • Image analysis quantified the distribution of terminals relative to barrel structures.

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Main Results:

  • VIP-immunoreactive axon terminals were found to be modularly distributed within the barrel cortex.
  • Terminals were preferentially localized to the side regions of barrels.
  • A relative scarcity of these terminals was observed in the barrel hollows.

Conclusions:

  • This study provides the first direct evidence for a modular distribution of VIP-containing axon terminals in the neocortex.
  • The findings suggest a specific role for VIPergic neurotransmission in the functional organization of the barrel cortex.