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Xie Z, Ma XH, Bai QF, Tang J, Sun JH, Jiang F, Guo W, Wang CM, Yang R, Wen YC, Wang FY, Chen YX, Zhang H, He DZ, Kelley MW, Yang S, Zhang WJ. ZBTB20 is essential for cochlear maturation and hearing in mice. Proc Natl Acad Sci U S A 2023; 120:e2220867120. [PMID: 37279265 PMCID: PMC10268240 DOI: 10.1073/pnas.2220867120] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2022] [Accepted: 04/25/2023] [Indexed: 06/08/2023] Open
Abstract
The mammalian cochlear epithelium undergoes substantial remodeling and maturation before the onset of hearing. However, very little is known about the transcriptional network governing cochlear late-stage maturation and particularly the differentiation of its lateral nonsensory region. Here, we establish ZBTB20 as an essential transcription factor required for cochlear terminal differentiation and maturation and hearing. ZBTB20 is abundantly expressed in the developing and mature cochlear nonsensory epithelial cells, with transient expression in immature hair cells and spiral ganglion neurons. Otocyst-specific deletion of Zbtb20 causes profound deafness with reduced endolymph potential in mice. The subtypes of cochlear epithelial cells are normally generated, but their postnatal development is arrested in the absence of ZBTB20, as manifested by an immature appearance of the organ of Corti, malformation of tectorial membrane (TM), a flattened spiral prominence (SP), and a lack of identifiable Boettcher cells. Furthermore, these defects are related with a failure in the terminal differentiation of the nonsensory epithelium covering the outer border Claudius cells, outer sulcus root cells, and SP epithelial cells. Transcriptome analysis shows that ZBTB20 regulates genes encoding for TM proteins in the greater epithelial ridge, and those preferentially expressed in root cells and SP epithelium. Our results point to ZBTB20 as an essential regulator for postnatal cochlear maturation and particularly for the terminal differentiation of cochlear lateral nonsensory domain.
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Affiliation(s)
- Zhifang Xie
- Ministry of Education-Shanghai Key Laboratory of Children's Environmental Health, Institute of Early Life Health, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai200092, China
- Department of Pathophysiology, Naval Medical University, Shanghai200433, China
| | - Xian-Hua Ma
- Department of Pathophysiology, Naval Medical University, Shanghai200433, China
| | - Qiu-Fang Bai
- NHC Key Laboratory of Hormones and Development, Chu Hsien-I Memorial Hospital and Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin300134, China
| | - Jie Tang
- Department of Physiology, Southern Medical University, Guangzhou, Guangdong510515, China
| | - Jian-He Sun
- Senior Department of Otolaryngology-Head and Neck Surgery, National Clinical Research Center for Otolaryngologic Diseases, the Sixth Medical Center of PLA General Hospital, Beijing100141, China
| | - Fei Jiang
- Ministry of Education-Shanghai Key Laboratory of Children's Environmental Health, Institute of Early Life Health, Xinhua Hospital, Shanghai Jiaotong University School of Medicine, Shanghai200092, China
| | - Wei Guo
- Senior Department of Otolaryngology-Head and Neck Surgery, National Clinical Research Center for Otolaryngologic Diseases, the Sixth Medical Center of PLA General Hospital, Beijing100141, China
| | - Chen-Ma Wang
- NHC Key Laboratory of Hormones and Development, Chu Hsien-I Memorial Hospital and Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin300134, China
| | - Rui Yang
- Department of Pathophysiology, Naval Medical University, Shanghai200433, China
| | - Yin-Chuan Wen
- Department of Physiology, Southern Medical University, Guangzhou, Guangdong510515, China
| | - Fang-Yuan Wang
- Senior Department of Otolaryngology-Head and Neck Surgery, National Clinical Research Center for Otolaryngologic Diseases, the Sixth Medical Center of PLA General Hospital, Beijing100141, China
| | - Yu-Xia Chen
- Department of Pathophysiology, Naval Medical University, Shanghai200433, China
| | - Hai Zhang
- Department of Pathophysiology, Naval Medical University, Shanghai200433, China
| | - David Z. He
- Department of Biomedical Sciences, Creighton University School of Medicine, Omaha, NE68178
| | | | - Shiming Yang
- Senior Department of Otolaryngology-Head and Neck Surgery, National Clinical Research Center for Otolaryngologic Diseases, the Sixth Medical Center of PLA General Hospital, Beijing100141, China
| | - Weiping J. Zhang
- Department of Pathophysiology, Naval Medical University, Shanghai200433, China
- NHC Key Laboratory of Hormones and Development, Chu Hsien-I Memorial Hospital and Tianjin Institute of Endocrinology, Tianjin Medical University, Tianjin300134, China
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Guo W, Yi H, Yan Z, Ren L, Chen L, Zhao LD, Ning Y, He DZZ, Yang SM. The morphological and functional development of the stria vascularis in miniature pigs. Reprod Fertil Dev 2018; 29:585-593. [PMID: 28442065 DOI: 10.1071/rd15183] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2015] [Accepted: 08/29/2015] [Indexed: 11/23/2022] Open
Abstract
The purpose of this study was to examine the morphological and functional development of the lateral wall of the scala media of the cochlea in miniature pigs; light and transmission electron microscopy and electrophysiology were used for this purpose. We showed that the lateral wall of the scala media of the cochlea appears at embryonic Day 21 (E21) when the cochlear duct begins to form. From E28 to E49, the lateral wall can be distinguished according to its position along the cochlea. At E56, cells in the lateral wall begin to differentiate into three different types. At E70, three cell types, marginal, intermediate and basal, can be clearly distinguished. At E91, the stria vascularis is adult-like and the organ of Corti is also morphologically mature. The average endocochlear potential measured from the second turn of the cochlea (at E98, postnatal Day 1 (P1), P13 and P30) was 71.4±2.5 (n=7), 78.8±1.5 (n=10), 77.3±2.3 (n=10) and 78.0±2.1 mV (n=10), respectively. Our results suggest that in miniature pigs the stria vascularis develops during the embryonic period, concurrent with maturation of the organ of Corti. The magnitude of the endocochlear potential reached its mature level when the stria vascularis was morphologically adult-like at E98. These findings provide a morphological and functional basis for future animal studies using the miniature pig model concerning the pathogenesis of various inner-ear diseases.
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Affiliation(s)
- Weiwei Guo
- Department of Otolaryngology-Head and Neck Surgery, Institute of Otolaryngology of PLA, Chinese PLA General Hospital, No. 28, FuXing Road, Haidian District, Beijing 100853, China
| | - Haijin Yi
- Department of Otolaryngology-Head and Neck Surgery, Institute of Otolaryngology of PLA, Chinese PLA General Hospital, No. 28, FuXing Road, Haidian District, Beijing 100853, China
| | - Zhang Yan
- Department of Otolaryngology-Head and Neck Surgery, Institute of Otolaryngology of PLA, Chinese PLA General Hospital, No. 28, FuXing Road, Haidian District, Beijing 100853, China
| | - Lili Ren
- Department of Otolaryngology-Head and Neck Surgery, Institute of Otolaryngology of PLA, Chinese PLA General Hospital, No. 28, FuXing Road, Haidian District, Beijing 100853, China
| | - Lei Chen
- State Key Laboratory for Agro-Biotechnology, China Agricultural University, No. 17, Tsinghua East Road, Haidian District, Beijing 100083, China
| | - Li Dong Zhao
- Department of Otolaryngology-Head and Neck Surgery, Institute of Otolaryngology of PLA, Chinese PLA General Hospital, No. 28, FuXing Road, Haidian District, Beijing 100853, China
| | - Yu Ning
- Department of Otolaryngology-Head and Neck Surgery, Institute of Otolaryngology of PLA, Chinese PLA General Hospital, No. 28, FuXing Road, Haidian District, Beijing 100853, China
| | - David Z Z He
- Department of Biomedical Sciences, Creighton University School of Medicine, 2500 California Plaza, Omaha, NE 68178, USA
| | - Shi-Ming Yang
- Department of Otolaryngology-Head and Neck Surgery, Institute of Otolaryngology of PLA, Chinese PLA General Hospital, No. 28, FuXing Road, Haidian District, Beijing 100853, China
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Chen J, Ingham N, Kelly J, Jadeja S, Goulding D, Pass J, Mahajan VB, Tsang SH, Nijnik A, Jackson IJ, White JK, Forge A, Jagger D, Steel KP. Spinster homolog 2 (spns2) deficiency causes early onset progressive hearing loss. PLoS Genet 2014; 10:e1004688. [PMID: 25356849 PMCID: PMC4214598 DOI: 10.1371/journal.pgen.1004688] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2014] [Accepted: 08/19/2014] [Indexed: 12/13/2022] Open
Abstract
Spinster homolog 2 (Spns2) acts as a Sphingosine-1-phosphate (S1P) transporter in zebrafish and mice, regulating heart development and lymphocyte trafficking respectively. S1P is a biologically active lysophospholipid with multiple roles in signalling. The mechanism of action of Spns2 is still elusive in mammals. Here, we report that Spns2-deficient mice rapidly lost auditory sensitivity and endocochlear potential (EP) from 2 to 3 weeks old. We found progressive degeneration of sensory hair cells in the organ of Corti, but the earliest defect was a decline in the EP, suggesting that dysfunction of the lateral wall was the primary lesion. In the lateral wall of adult mutants, we observed structural changes of marginal cell boundaries and of strial capillaries, and reduced expression of several key proteins involved in the generation of the EP (Kcnj10, Kcnq1, Gjb2 and Gjb6), but these changes were likely to be secondary. Permeability of the boundaries of the stria vascularis and of the strial capillaries appeared normal. We also found focal retinal degeneration and anomalies of retinal capillaries together with anterior eye defects in Spns2 mutant mice. Targeted inactivation of Spns2 in red blood cells, platelets, or lymphatic or vascular endothelial cells did not affect hearing, but targeted ablation of Spns2 in the cochlea using a Sox10-Cre allele produced a similar auditory phenotype to the original mutation, suggesting that local Spns2 expression is critical for hearing in mammals. These findings indicate that Spns2 is required for normal maintenance of the EP and hence for normal auditory function, and support a role for S1P signalling in hearing. Progressive hearing loss is common in the human population but we know very little about the molecular mechanisms involved. Mutant mice are useful for investigating these mechanisms and have revealed a wide range of different abnormalities that can all lead to the same outcome: deafness. We report here our findings of a new mouse line with a mutation in the Spns2 gene, affecting the release of a lipid called sphingosine-1-phosphate, which has an important role in several processes in the body. For the first time, we report that this molecular pathway is required for normal hearing through a role in generating a voltage difference that acts like a battery, allowing the sensory hair cells of the cochlea to detect sounds at extremely low levels. Without the normal function of the Spns2 gene and release of sphingosine-1-phosphate locally in the inner ear, the voltage in the cochlea declines, leading to rapid loss of sensitivity to sound and ultimately to complete deafness. The human version of this gene, SPNS2, may be involved in human deafness, and understanding the underlying mechanism presents an opportunity to develop potential treatments for this form of hearing loss.
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Affiliation(s)
- Jing Chen
- Wellcome Trust Sanger Institute, Hinxton, Cambridge, United Kingdom
- Wolfson Centre for Age-Related Diseases, King's College London, London, United Kingdom
| | - Neil Ingham
- Wellcome Trust Sanger Institute, Hinxton, Cambridge, United Kingdom
- Wolfson Centre for Age-Related Diseases, King's College London, London, United Kingdom
| | - John Kelly
- Centre for Auditory Research, UCL Ear Institute, London, United Kingdom
| | - Shalini Jadeja
- MRC Human Genetics Unit, MRC Institute of Genetics & Molecular Medicine, University of Edinburgh, Edinburgh, United Kingdom, and Roslin Institute, University of Edinburgh, Easter Bush, United Kingdom
| | - David Goulding
- Wellcome Trust Sanger Institute, Hinxton, Cambridge, United Kingdom
| | - Johanna Pass
- Wellcome Trust Sanger Institute, Hinxton, Cambridge, United Kingdom
- Wolfson Centre for Age-Related Diseases, King's College London, London, United Kingdom
| | - Vinit B. Mahajan
- Omics Laboratory, University of Iowa, Iowa City, Iowa, United States of America
| | - Stephen H. Tsang
- Edward S. Harkness Eye Institute, Columbia University, New York, New York, United States of America
| | - Anastasia Nijnik
- Wellcome Trust Sanger Institute, Hinxton, Cambridge, United Kingdom
- Department of Physiology, Complex Traits Group, McGill University, Montreal, Quebec, Canada
| | - Ian J. Jackson
- MRC Human Genetics Unit, MRC Institute of Genetics & Molecular Medicine, University of Edinburgh, Edinburgh, United Kingdom, and Roslin Institute, University of Edinburgh, Easter Bush, United Kingdom
| | | | - Andrew Forge
- Centre for Auditory Research, UCL Ear Institute, London, United Kingdom
| | - Daniel Jagger
- Centre for Auditory Research, UCL Ear Institute, London, United Kingdom
| | - Karen P. Steel
- Wellcome Trust Sanger Institute, Hinxton, Cambridge, United Kingdom
- Wolfson Centre for Age-Related Diseases, King's College London, London, United Kingdom
- * E-mail:
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Ho Lee, Jun Kim, Sang Jeong Kim J. Effect of Vasopressin on Marginal Cells of Neonatal Rat Cochlea In Vitro. Acta Otolaryngol 2009. [DOI: 10.1080/00016480127371] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Lee SY, Maniak PJ, Ingbar DH, O'Grady SM. Adult alveolar epithelial cells express multiple subtypes of voltage-gated K+ channels that are located in apical membrane. Am J Physiol Cell Physiol 2003; 284:C1614-24. [PMID: 12606310 DOI: 10.1152/ajpcell.00429.2002] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Whole cell perforated patch-clamp experiments were performed with adult rat alveolar epithelial cells. The holding potential was -60 mV, and depolarizing voltage steps activated voltage-gated K(+) (Kv) channels. The voltage-activated currents exhibited a mean reversal potential of -32 mV. Complete activation was achieved at -10 mV. The currents exhibited slow inactivation, with significant variability in the time course between cells. Tail current analysis revealed cell-to-cell variability in K(+) selectivity, suggesting contributions of multiple Kv alpha-subunits to the whole cell current. The Kv channels also displayed steady-state inactivation when the membrane potential was held at depolarized voltages with a window current between -30 and 5 mV. Analysis of RNA isolated from these cells by RT-PCR revealed the presence of eight Kv alpha-subunits (Kv1.1, Kv1.3, Kv1.4, Kv2.2, Kv4.1, Kv4.2, Kv4.3, and Kv9.3), three beta-subunits (Kvbeta1.1, Kvbeta2.1, and Kvbeta3.1), and two K(+) channel interacting protein (KChIP) isoforms (KChIP2 and KChIP3). Western blot analysis with available Kv alpha-subunit antibodies (Kv1.1, Kv1.3, Kv1.4, Kv4.2, and Kv4.3) showed labeling of 50-kDa proteins from alveolar epithelial cells grown in monolayer culture. Immunocytochemical analysis of cells from monolayers showed that Kv1.1, Kv1.3, Kv1.4, Kv4.2, and Kv4.3 were localized to the apical membrane. We conclude that expression of multiple Kv alpha-, beta-, and KChIP subunits explains the variability in inactivation gating and K(+) selectivity observed between cells and that Kv channels in the apical membrane may contribute to basal K(+) secretion across the alveolar epithelium.
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Affiliation(s)
- So Yeong Lee
- Department of Physiology, University of Minnesota, St. Paul 55108, USA
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