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Loss of KCNJ10 protein expression abolishes endocochlear potential and causes deafness in Pendred syndrome mouse model
BACKGROUND: Pendred syndrome, a common autosomal-recessive disorder characterized by congenital deafness and goiter, is caused by mutations of SLC26A4, which codes for pendrin. We investigated the relationship between pendrin and deafness using mice that have (Slc26a4(+/+)) or lack a complete Slc26a...
Autores principales: | , , , , , , , , , , , |
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Formato: | Texto |
Lenguaje: | English |
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BioMed Central
2004
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC516044/ https://www.ncbi.nlm.nih.gov/pubmed/15320950 http://dx.doi.org/10.1186/1741-7015-2-30 |
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author | Wangemann, Philine Itza, Erin M Albrecht, Beatrice Wu, Tao Jabba, Sairam V Maganti, Rajanikanth J Ho Lee, Jun Everett, Lorraine A Wall, Susan M Royaux, Ines E Green, Eric D Marcus, Daniel C |
author_facet | Wangemann, Philine Itza, Erin M Albrecht, Beatrice Wu, Tao Jabba, Sairam V Maganti, Rajanikanth J Ho Lee, Jun Everett, Lorraine A Wall, Susan M Royaux, Ines E Green, Eric D Marcus, Daniel C |
author_sort | Wangemann, Philine |
collection | PubMed |
description | BACKGROUND: Pendred syndrome, a common autosomal-recessive disorder characterized by congenital deafness and goiter, is caused by mutations of SLC26A4, which codes for pendrin. We investigated the relationship between pendrin and deafness using mice that have (Slc26a4(+/+)) or lack a complete Slc26a4 gene (Slc26a4(-/-)). METHODS: Expression of pendrin and other proteins was determined by confocal immunocytochemistry. Expression of mRNA was determined by quantitative RT-PCR. The endocochlear potential and the endolymphatic K(+ )concentration were measured with double-barreled microelectrodes. Currents generated by the stria marginal cells were recorded with a vibrating probe. Tissue masses were evaluated by morphometric distance measurements and pigmentation was quantified by densitometry. RESULTS: Pendrin was found in the cochlea in apical membranes of spiral prominence cells and spindle-shaped cells of stria vascularis, in outer sulcus and root cells. Endolymph volume in Slc26a4(-/- )mice was increased and tissue masses in areas normally occupied by type I and II fibrocytes were reduced. Slc26a4(-/- )mice lacked the endocochlear potential, which is generated across the basal cell barrier by the K(+ )channel KCNJ10 localized in intermediate cells. Stria vascularis was hyperpigmented, suggesting unalleviated free radical damage. The basal cell barrier appeared intact; intermediate cells and KCNJ10 mRNA were present but KCNJ10 protein was absent. Endolymphatic K(+ )concentrations were normal and membrane proteins necessary for K(+ )secretion were present, including the K(+ )channel KCNQ1 and KCNE1, Na(+)/2Cl(-)/K(+ )cotransporter SLC12A2 and the gap junction GJB2. CONCLUSIONS: These observations demonstrate that pendrin dysfunction leads to a loss of KCNJ10 protein expression and a loss of the endocochlear potential, which may be the direct cause of deafness in Pendred syndrome. |
format | Text |
id | pubmed-516044 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2004 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-5160442004-09-05 Loss of KCNJ10 protein expression abolishes endocochlear potential and causes deafness in Pendred syndrome mouse model Wangemann, Philine Itza, Erin M Albrecht, Beatrice Wu, Tao Jabba, Sairam V Maganti, Rajanikanth J Ho Lee, Jun Everett, Lorraine A Wall, Susan M Royaux, Ines E Green, Eric D Marcus, Daniel C BMC Med Research Article BACKGROUND: Pendred syndrome, a common autosomal-recessive disorder characterized by congenital deafness and goiter, is caused by mutations of SLC26A4, which codes for pendrin. We investigated the relationship between pendrin and deafness using mice that have (Slc26a4(+/+)) or lack a complete Slc26a4 gene (Slc26a4(-/-)). METHODS: Expression of pendrin and other proteins was determined by confocal immunocytochemistry. Expression of mRNA was determined by quantitative RT-PCR. The endocochlear potential and the endolymphatic K(+ )concentration were measured with double-barreled microelectrodes. Currents generated by the stria marginal cells were recorded with a vibrating probe. Tissue masses were evaluated by morphometric distance measurements and pigmentation was quantified by densitometry. RESULTS: Pendrin was found in the cochlea in apical membranes of spiral prominence cells and spindle-shaped cells of stria vascularis, in outer sulcus and root cells. Endolymph volume in Slc26a4(-/- )mice was increased and tissue masses in areas normally occupied by type I and II fibrocytes were reduced. Slc26a4(-/- )mice lacked the endocochlear potential, which is generated across the basal cell barrier by the K(+ )channel KCNJ10 localized in intermediate cells. Stria vascularis was hyperpigmented, suggesting unalleviated free radical damage. The basal cell barrier appeared intact; intermediate cells and KCNJ10 mRNA were present but KCNJ10 protein was absent. Endolymphatic K(+ )concentrations were normal and membrane proteins necessary for K(+ )secretion were present, including the K(+ )channel KCNQ1 and KCNE1, Na(+)/2Cl(-)/K(+ )cotransporter SLC12A2 and the gap junction GJB2. CONCLUSIONS: These observations demonstrate that pendrin dysfunction leads to a loss of KCNJ10 protein expression and a loss of the endocochlear potential, which may be the direct cause of deafness in Pendred syndrome. BioMed Central 2004-08-20 /pmc/articles/PMC516044/ /pubmed/15320950 http://dx.doi.org/10.1186/1741-7015-2-30 Text en Copyright © 2004 Wangemann et al; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an open-access article distributed under the terms of the Creative Commons Attribution License ( (http://creativecommons.org/licenses/by/2.0) ), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. |
spellingShingle | Research Article Wangemann, Philine Itza, Erin M Albrecht, Beatrice Wu, Tao Jabba, Sairam V Maganti, Rajanikanth J Ho Lee, Jun Everett, Lorraine A Wall, Susan M Royaux, Ines E Green, Eric D Marcus, Daniel C Loss of KCNJ10 protein expression abolishes endocochlear potential and causes deafness in Pendred syndrome mouse model |
title | Loss of KCNJ10 protein expression abolishes endocochlear potential and causes deafness in Pendred syndrome mouse model |
title_full | Loss of KCNJ10 protein expression abolishes endocochlear potential and causes deafness in Pendred syndrome mouse model |
title_fullStr | Loss of KCNJ10 protein expression abolishes endocochlear potential and causes deafness in Pendred syndrome mouse model |
title_full_unstemmed | Loss of KCNJ10 protein expression abolishes endocochlear potential and causes deafness in Pendred syndrome mouse model |
title_short | Loss of KCNJ10 protein expression abolishes endocochlear potential and causes deafness in Pendred syndrome mouse model |
title_sort | loss of kcnj10 protein expression abolishes endocochlear potential and causes deafness in pendred syndrome mouse model |
topic | Research Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC516044/ https://www.ncbi.nlm.nih.gov/pubmed/15320950 http://dx.doi.org/10.1186/1741-7015-2-30 |
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