Kir4.1 potassium channel subunit is crucial for oligodendrocyte development and in vivo myelination

Clemens Neusch, Nora Rozengurt, Russell E. Jacobs, Henry A. Lester, Paulo Kofuji

Research output: Contribution to journalArticle

224 Scopus citations

Abstract

To understand the cellular and in vivo functions of specific K+ channels in glia, we have studied mice with a null mutation in the weakly inwardly rectifying K+ channel subunit Kir4.1. Kir4.1-/- mice display marked motor impairment, and the cellular basis is hypomyelination in the spinal cord, accompanied by severe spongiform vacuolation, axonal swellings, and degeneration. Immunostaining in the spinal cord of wild-type mice up to postnatal day 18 reveals that Kir4.1 is expressed in myelin-synthesizing oligodendrocytes, but probably not in neurons or glial fibrillary acidic protein-positive (GFAP-positive) astrocytes. Cultured oligodendrocytes from developing spinal cord of Kir4.1-/- mice lack most of the wild-type K+ conductance, have depolarized membrane potentials, and display immature morphology. By contrast, cultured neurons from spinal cord of Kir4.1-/- mice have normal physiological characteristics. We conclude that Kir4.1 forms the major K+ conductance of oligodendrocytes and is therefore crucial for myelination. The Kir4.1 knock-out mouse is one of the few CNS dysmyelinating or demyelinating phenotypes that does not involve a gene directly involved in the structure, synthesis, degradation, or immune response to myelin. Therefore, this mouse shows how an ion channel mutation could contribute to the polygenic demyelinating diseases.

Original languageEnglish (US)
Pages (from-to)5429-5438
Number of pages10
JournalJournal of Neuroscience
Volume21
Issue number15
DOIs
StatePublished - Aug 1 2001

Keywords

  • Glia
  • Inwardly rectifying potassium channels
  • Knock-out mouse
  • Myelination
  • Oligodendrocytes
  • Spinal cord

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