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Updated: Feb 5, 2026

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Oligodendrocyte-encoded Kir4.1 function is required for axonal integrity.

Lucas Schirmer1,2,3,4, Wiebke Möbius5,6, Chao Zhao4,7

  • 1Eli and Edythe Broad Center of Regeneration Medicine and Stem Cell Research, University of California, San Francisco, San Francisco, California, United States.

Elife
|September 12, 2018
PubMed
Summary
This summary is machine-generated.

Oligodendrocyte Kir4.1 channels are vital for maintaining axon health and function throughout life and after white matter injury. Loss of this potassium channel leads to progressive neurodegeneration and motor deficits.

Keywords:
Kir4.1 (KCNJ10)mouseneurobiologyneurodegenerationneuroscienceoligodendrocytesvisual Systemwhite matter

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Area of Science:

  • Neuroscience
  • Cell Biology
  • White Matter Diseases

Background:

  • Glial cells, specifically oligodendrocytes, provide essential support for axon function.
  • Dysregulation of glial support is implicated in white matter diseases.
  • Mutations in KCNJ10, encoding the Kir4.1 channel, cause severe human neurological disorders.

Purpose of the Study:

  • To investigate the role of Kir4.1 channels in oligodendrocytes (OLs) across different life stages and following white matter (WM) injury.
  • To elucidate the specific functions of OL-expressed Kir4.1 in maintaining axonal integrity and function.

Main Methods:

  • Conditional knockout (cKO) of the KCNJ10 gene in oligodendrocytes (OL-Kcnj10 cKO mice).
  • Localization studies of Kir4.1 channels within oligodendrocytes.
  • Assessment of neuro-axonal function using electrophysiology (visual evoked potentials) and behavioral tests (motor deficits).
  • Histological analysis of retinal thinning and mitochondrial damage.

Main Results:

  • Kir4.1 channels are localized to perinodal areas and inner myelin tongue of oligodendrocytes, suggesting a role in potassium ion removal.
  • OL-Kcnj10 cKO mice exhibit late-onset mitochondrial damage and axonal degeneration.
  • Adult OL-Kcnj10 cKO mice display significant neuro-axonal dysfunction, including delayed visual evoked potentials, retinal thinning, and progressive motor deficits.
  • Axon pathologies are worsened by white matter injury in the spinal cord of OL-Kcnj10 cKO mice.

Conclusions:

  • Oligodendrocyte Kir4.1 channels are crucial for the long-term maintenance of axonal function and integrity.
  • Loss of OL-Kir4.1 contributes to neurodegeneration and functional deficits, particularly under stress conditions like white matter injury.
  • These findings highlight OL-Kir4.1 as a potential therapeutic target for white matter diseases.