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Altered Gap Junction Network Topography in Mouse Models for Human Hereditary Deafness.

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Summary

Spontaneous neuronal activity is not essential for forming anisotropic astrocyte networks in the auditory brainstem. However, this activity is crucial for orienting these networks correctly, highlighting neuron-glia interaction importance.

Keywords:
astrocytesauditory brainstemdeafnessgap junctionslateral superior oliveotoferlinspontaneous activityvoltage-activated calcium channel 1.3

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Developmental Biology

Background:

  • Astrocytes exhibit anisotropic gap junctional coupling in many brain regions.
  • In the lateral superior olive (LSO), astrocytic networks are anisotropic and oriented orthogonally to the tonotopic axis.
  • Auditory brainstem nuclei in CaV1.3 and otoferlin knock-out (KO) mice lack spontaneous cochlea-driven neuronal activity, leading to disturbed neuronal circuitry.

Purpose of the Study:

  • To investigate whether the disturbance in neuronal circuitry in KO mice is associated with impaired topography of LSO astrocyte networks.
  • To determine the role of spontaneous cochlea-driven neuronal activity in the formation and orientation of LSO astrocyte networks.

Main Methods:

  • Immunohistochemical analysis of astrocytic connexin (Cx) 43 and Cx30 expression in auditory brainstem nuclei of KO and wild-type (WT) mice.
  • Loading LSO astrocytes with the gap junction-permeable tracer neurobiotin to assess network shape and orientation.
  • Quantitative assessment of tracer-coupled cell numbers and network anisotropy.

Main Results:

  • CaV1.3 KO mice showed elevated Cx30 and slightly increased Cx43 immunoreactivity in the LSO.
  • Otoferlin KO mice exhibited a slight increase in Cx43, with unchanged Cx30 levels.
  • Network anisotropy was maintained in both KO strains, but LSO networks were oriented parallel, not orthogonal, to the tonotopic axis, unlike in WTs.

Conclusions:

  • Spontaneous cochlea-driven neuronal activity is not required for the formation of anisotropic LSO astrocyte networks.
  • Neuronal activity is essential for establishing the correct orientation of these networks.
  • Proper LSO astrocyte network formation depends on peripheral neuronal input, emphasizing the critical role of neuron-glia interactions during early auditory brainstem development.