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Anisotropic Panglial Coupling Reflects Tonotopic Organization in the Inferior Colliculus.

Simon L Wadle1, Vanessa Augustin1, Julia Langer2

  • 1Animal Physiology Group, Department of Biology, University of Kaiserslautern, Kaiserslautern, Germany.

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|December 14, 2018
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Summary

Glial networks in the auditory brainstem show specialized, anisotropic organization. This orientation, orthogonal to the tonotopic axis in the inferior colliculus, suggests a general feature across auditory nuclei.

Keywords:
ICastrocytesauditory brainstemconnexin 30connexin 43gap junctionsoligodendrocytes

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Area of Science:

  • Neuroscience
  • Cellular Neuroscience
  • Auditory Neuroscience

Background:

  • Panglial networks, formed by astrocytes and oligodendrocytes, exhibit topography correlating with neuronal function.
  • Anisotropic astrocyte-oligodendrocyte networks in the lateral superior olive (LSO) are oriented orthogonally to the tonotopic axis.

Purpose of the Study:

  • To investigate if similar topographic specialization exists in other tonotopically organized auditory brainstem nuclei.
  • To analyze gap junctional coupling and network topography in the inferior colliculus (IC).

Main Methods:

  • Whole-cell patch-clamp recordings in acute mouse brainstem slices.
  • Sulforhodamine (SR) 101 staining to identify astrocytes.
  • Intracellular loading of neurobiotin to trace gap junctional coupling.
  • Sodium (Na+) imaging to assess ion redistribution capabilities.

Main Results:

  • Inferior colliculus (IC) panglial networks predominantly displayed oval topography, oriented orthogonally to the tonotopic axis.
  • Astrocyte processes exhibited a similar preferential orientation, correlating with network topography.
  • Functional analysis confirmed bi-directional sodium ion diffusion between astrocytes and oligodendrocytes, indicating functional panglial networks.

Conclusions:

  • Astrocytes and oligodendrocytes in the IC form functional, anisotropic panglial networks.
  • The preferential orientation orthogonal to the tonotopic axis in the IC suggests a general feature of tonotopically organized auditory brainstem nuclei, similar to the LSO.