| Inwardly rectifying potassium channel Kir4.1 is localized at the calyx endings of vestibular afferents. | |
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MedLine Citation:
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PMID: 22546335 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Inwardly rectifying potassium (Kir) channel Kir4.1 (also called Kcnj10) is expressed in various cells such as satellite glial cells. It is suggested that these cells would absorb excess accumulated K(+) from intercellular space which is surrounded by these cell membranes expressing Kir4.1. In the vestibular system, loss of Kir4.1 results in selective degeneration of type I hair cells despite normal development of type II hair cells. The mechanisms underlying this developmental disorder have been unclear, because it was thought that Kir4.1 is only expressed in glial cells throughout the entire nervous system. Here, we show that Kir4.1 is expressed not only in glial cells but also in neurons of the mouse vestibular system. In the vestibular ganglion, Kir4.1 mRNA is transcribed in both satellite cells and neuronal somata, whereas Kir4.1 protein is expressed only in satellite cells. On the other hand, in the vestibular sensory epithelia, Kir4.1 protein is localized at the calyx endings of vestibular afferents, which surround type I hair cells. Kir4.1 protein expression in the vestibular sensory epithelia is detected beginning after birth, and its localization gradually adopts a calyceal shape until type I hair cells are mature. Kir4.1 localized at the calyx endings may play a role in the K(+)-buffering action of vestibular afferents surrounding type I hair cells. |
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Authors:
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Tomokatsu Udagawa; Norifumi Tatsumi; Toshiaki Tachibana; Yoshikatsu Negishi; Hiroki Saijo; Toshiki Kobayashi; Yuichiro Yaguchi; Hiromi Kojima; Hiroshi Moriyama; Masataka Okabe |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-4-27 |
Journal Detail:
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Title: Neuroscience Volume: - ISSN: 1873-7544 ISO Abbreviation: - Publication Date: 2012 Apr |
Date Detail:
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Created Date: 2012-5-1 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 7605074 Medline TA: Neuroscience Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2012 IBRO. Published by Elsevier Ltd. All rights reserved. |
Affiliation:
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Department of Otorhinolaryngology, The Jikei University School of Medicine, Tokyo 105-8461, Japan; Department of Anatomy, The Jikei University School of Medicine, Tokyo 105-8461, Japan. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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