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Oya R, Tsukamoto O, Sato T, Kato H, Matsuoka K, Oshima K, Kamakura T, Ohta Y, Imai T, Takashima S, Inohara H. Phosphorylation of MYL12 by Myosin Light Chain Kinase Regulates Cellular Shape Changes in Cochlear Hair Cells. J Assoc Res Otolaryngol 2021; 22:425-441. [PMID: 33877471 PMCID: PMC8329122 DOI: 10.1007/s10162-021-00796-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2020] [Accepted: 03/11/2021] [Indexed: 10/21/2022] Open
Abstract
The organ of Corti is an auditory organ located in the cochlea, comprising hair cells (HCs) and other supporting cells. Cellular shape changes of HCs are important for the development of auditory epithelia and hearing function. It was previously observed that HCs and inner sulcus cells (ISCs) demonstrate cellular shape changes similar to the apical constriction of the neural epithelia. Apical constriction is induced via actomyosin cable contraction in the apical junctional complex and necessary for the physiological function of the epithelium. Actomyosin cable contraction is mainly regulated by myosin regulatory light chain (MRLC) phosphorylation by myosin light chain kinase (MLCK). However, MRLC and MLCK isoforms expressed in HCs and ISCs are unknown. Hence, we investigated the expression patterns and roles of MRLCs and MLCKs in HCs. Droplet digital PCR revealed that HCs expressed MYL12A/B and MYL9, which are non-muscle MRLC and smooth muscle MLCK (smMLCK), respectively. Immunofluorescence staining throughout the organ of Corti demonstrated that only MYL12 was expressed in the apical portion of HCs, whereas MYL12 and MYL9 were expressed on ISCs. In addition, purified MYL12B was phosphorylated by smMLCK in vitro, and the harvested HCs contained phosphorylated MYL12. Furthermore, accompanied by the expansion of the cell area of outer HCs, MYL12 phosphorylation was reduced by ML-7, which is an inhibitor of smMLCK. In conclusion, MYL12 phosphorylation by smMLCK contributed to the apical constriction-like cellular shape change of HCs possibly relating to the development of auditory epithelia and hearing function.
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Affiliation(s)
- Ryohei Oya
- Department of Otorhinolaryngology-Head and Neck Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
- Department of Medical Biochemistry, Osaka University Graduate School of Medicine/Frontier Biosciences, Osaka, Japan
| | - Osamu Tsukamoto
- Department of Medical Biochemistry, Osaka University Graduate School of Medicine/Frontier Biosciences, Osaka, Japan
| | - Takashi Sato
- Department of Otorhinolaryngology-Head and Neck Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Hisakazu Kato
- Department of Medical Biochemistry, Osaka University Graduate School of Medicine/Frontier Biosciences, Osaka, Japan
| | - Ken Matsuoka
- Department of Medical Biochemistry, Osaka University Graduate School of Medicine/Frontier Biosciences, Osaka, Japan
| | - Kazuo Oshima
- Department of Otorhinolaryngology-Head and Neck Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Takefumi Kamakura
- Department of Otorhinolaryngology-Head and Neck Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Yumi Ohta
- Department of Otorhinolaryngology-Head and Neck Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Takao Imai
- Department of Otorhinolaryngology-Head and Neck Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
| | - Seiji Takashima
- Department of Medical Biochemistry, Osaka University Graduate School of Medicine/Frontier Biosciences, Osaka, Japan
| | - Hidenori Inohara
- Department of Otorhinolaryngology-Head and Neck Surgery, Osaka University Graduate School of Medicine, Osaka, Japan
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Zhu GJ, Gong S, Ma DB, Tao T, He WQ, Zhang L, Wang F, Qian XY, Zhou H, Fan C, Wang P, Chen X, Zhao W, Sun J, Chen H, Wang Y, Gao X, Zuo J, Zhu MS, Gao X, Wan G. Aldh inhibitor restores auditory function in a mouse model of human deafness. PLoS Genet 2020; 16:e1009040. [PMID: 32970669 PMCID: PMC7553308 DOI: 10.1371/journal.pgen.1009040] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Revised: 10/13/2020] [Accepted: 08/10/2020] [Indexed: 02/06/2023] Open
Abstract
Genetic hearing loss is a common health problem with no effective therapy currently available. DFNA15, caused by mutations of the transcription factor POU4F3, is one of the most common forms of autosomal dominant non-syndromic deafness. In this study, we established a novel mouse model of the human DFNA15 deafness, with a Pou4f3 gene mutation (Pou4f3Δ) identical to that found in a familial case of DFNA15. The Pou4f3(Δ/+) mice suffered progressive deafness in a similar manner to the DFNA15 patients. Hair cells in the Pou4f3(Δ/+) cochlea displayed significant stereociliary and mitochondrial pathologies, with apparent loss of outer hair cells. Progression of hearing and outer hair cell loss of the Pou4f3(Δ/+) mice was significantly modified by other genetic and environmental factors. Using Pou4f3(-/+) heterozygous knockout mice, we also showed that DFNA15 is likely caused by haploinsufficiency of the Pou4f3 gene. Importantly, inhibition of retinoic acid signaling by the aldehyde dehydrogenase (Aldh) and retinoic acid receptor inhibitors promoted Pou4f3 expression in the cochlear tissue and suppressed the progression of hearing loss in the mutant mice. These data demonstrate Pou4f3 haploinsufficiency as the main underlying cause of human DFNA15 deafness and highlight the therapeutic potential of Aldh inhibitors for treatment of progressive hearing loss. More than 50% of deafness cases are due to genetic defects with no treatment available. DFNA15, caused by mutations of the transcription factor POU4F3, is one of the most common types of autosomal dominant non-syndromic deafness. Here, we established a novel mouse model with the exact Pou4f3 mutation identified in human patients. The mutant mouse display similar auditory pathophysiology as human patients and exhibit multiple hair cell abnormalities. The onset and severity of hearing loss in the mouse model is highly modifiable to environmental factors, such as aging, noise exposure or genetic backgrounds. Using a new knockout mouse model, we found Pou4f3 haploinsufficiency as the underlying mechanism of human DFNA15. Importantly, we identified Aldh inhibitor as a potent small molecule for upregulation of Pou4f3 and treatment of hearing loss in the mutant mouse. The identification of Aldh inhibitor for treatment of DFNA15 deafness represents a major advance in the unmet medical need for this common form of progressive hearing loss.
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Affiliation(s)
- Guang-Jie Zhu
- Department of Otorhinolaryngology, Provincial Key Discipline of the affiliated Drum Tower Hospital of Nanjing University and Model Animal Research Center, MOE Key Laboratory of Model Animal for Disease Studies, School of Medicine, Nanjing University, Nanjing, China
| | - Sihao Gong
- Department of Otorhinolaryngology, Provincial Key Discipline of the affiliated Drum Tower Hospital of Nanjing University and Model Animal Research Center, MOE Key Laboratory of Model Animal for Disease Studies, School of Medicine, Nanjing University, Nanjing, China
| | - Deng-Bin Ma
- Department of Otorhinolaryngology, Provincial Key Discipline of the affiliated Drum Tower Hospital of Nanjing University and Model Animal Research Center, MOE Key Laboratory of Model Animal for Disease Studies, School of Medicine, Nanjing University, Nanjing, China
| | - Tao Tao
- Department of Otorhinolaryngology, Provincial Key Discipline of the affiliated Drum Tower Hospital of Nanjing University and Model Animal Research Center, MOE Key Laboratory of Model Animal for Disease Studies, School of Medicine, Nanjing University, Nanjing, China
| | - Wei-Qi He
- Department of Otorhinolaryngology, Provincial Key Discipline of the affiliated Drum Tower Hospital of Nanjing University and Model Animal Research Center, MOE Key Laboratory of Model Animal for Disease Studies, School of Medicine, Nanjing University, Nanjing, China
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Cambridge-Suda (CAM-SU) Genomic Resource Center, Medical College of Soochow University, Suzhou, China
| | - Linqing Zhang
- Department of Otorhinolaryngology, Provincial Key Discipline of the affiliated Drum Tower Hospital of Nanjing University and Model Animal Research Center, MOE Key Laboratory of Model Animal for Disease Studies, School of Medicine, Nanjing University, Nanjing, China
| | - Fang Wang
- Department of Otorhinolaryngology, Provincial Key Discipline of the affiliated Drum Tower Hospital of Nanjing University and Model Animal Research Center, MOE Key Laboratory of Model Animal for Disease Studies, School of Medicine, Nanjing University, Nanjing, China
| | - Xiao-Yun Qian
- Department of Otorhinolaryngology, Provincial Key Discipline of the affiliated Drum Tower Hospital of Nanjing University and Model Animal Research Center, MOE Key Laboratory of Model Animal for Disease Studies, School of Medicine, Nanjing University, Nanjing, China
| | - Han Zhou
- Department of Otorhinolaryngology, Provincial Key Discipline of the affiliated Drum Tower Hospital of Nanjing University and Model Animal Research Center, MOE Key Laboratory of Model Animal for Disease Studies, School of Medicine, Nanjing University, Nanjing, China
| | - Chi Fan
- Department of Otorhinolaryngology, Provincial Key Discipline of the affiliated Drum Tower Hospital of Nanjing University and Model Animal Research Center, MOE Key Laboratory of Model Animal for Disease Studies, School of Medicine, Nanjing University, Nanjing, China
| | - Pei Wang
- Department of Otorhinolaryngology, Provincial Key Discipline of the affiliated Drum Tower Hospital of Nanjing University and Model Animal Research Center, MOE Key Laboratory of Model Animal for Disease Studies, School of Medicine, Nanjing University, Nanjing, China
| | - Xin Chen
- Department of Otorhinolaryngology, Provincial Key Discipline of the affiliated Drum Tower Hospital of Nanjing University and Model Animal Research Center, MOE Key Laboratory of Model Animal for Disease Studies, School of Medicine, Nanjing University, Nanjing, China
| | - Wei Zhao
- Department of Otorhinolaryngology, Provincial Key Discipline of the affiliated Drum Tower Hospital of Nanjing University and Model Animal Research Center, MOE Key Laboratory of Model Animal for Disease Studies, School of Medicine, Nanjing University, Nanjing, China
| | - Jie Sun
- Department of Otorhinolaryngology, Provincial Key Discipline of the affiliated Drum Tower Hospital of Nanjing University and Model Animal Research Center, MOE Key Laboratory of Model Animal for Disease Studies, School of Medicine, Nanjing University, Nanjing, China
| | - Huaqun Chen
- College of Life Science, Nanjing Normal University, Nanjing, China
| | - Ye Wang
- Nanjing MuCyte Biotechnology Co., Ltd., Nanjing, China
| | - Xiang Gao
- Department of Otorhinolaryngology, Provincial Key Discipline of the affiliated Drum Tower Hospital of Nanjing University and Model Animal Research Center, MOE Key Laboratory of Model Animal for Disease Studies, School of Medicine, Nanjing University, Nanjing, China
| | - Jian Zuo
- Department of Biomedical Sciences, School of Medicine, Creighton University, United States of America
| | - Min-Sheng Zhu
- Department of Otorhinolaryngology, Provincial Key Discipline of the affiliated Drum Tower Hospital of Nanjing University and Model Animal Research Center, MOE Key Laboratory of Model Animal for Disease Studies, School of Medicine, Nanjing University, Nanjing, China
- Institute for Brain Sciences, Nanjing University, Nanjing, China
- * E-mail: (MSZ); (XG); (GW)
| | - Xia Gao
- Department of Otorhinolaryngology, Provincial Key Discipline of the affiliated Drum Tower Hospital of Nanjing University and Model Animal Research Center, MOE Key Laboratory of Model Animal for Disease Studies, School of Medicine, Nanjing University, Nanjing, China
- * E-mail: (MSZ); (XG); (GW)
| | - Guoqiang Wan
- Department of Otorhinolaryngology, Provincial Key Discipline of the affiliated Drum Tower Hospital of Nanjing University and Model Animal Research Center, MOE Key Laboratory of Model Animal for Disease Studies, School of Medicine, Nanjing University, Nanjing, China
- Institute for Brain Sciences, Nanjing University, Nanjing, China
- * E-mail: (MSZ); (XG); (GW)
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Diao H, Zhao L, Qin L, Bai W, Wang K, Zhang J, Chen X, Jiang H, Mao L. Lower expression of prestin and MYO7A correlates with menopause-associated hearing loss. Climacteric 2019; 22:361-369. [PMID: 30612476 DOI: 10.1080/13697137.2018.1547698] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- H. Diao
- Peking University Ninth School of Clinical Medicine, Beijing Shi, China
| | - L. Zhao
- Chinese PLA General Hospital, Beijing Shi, China
| | - L. Qin
- Peking University Health Science Centre, Beijing Shi, China
| | - W. Bai
- Peking University Ninth School of Clinical Medicine, Beijing Shi, China
| | - K. Wang
- Peking University Health Science Centre, Beijing Shi, China
| | - J. Zhang
- Peking University Ninth School of Clinical Medicine, Beijing Shi, China
| | - X. Chen
- Peking University First Hospital, Beijing Shi, China
| | - H. Jiang
- Peking University Health Science Centre, Beijing Shi, China
| | - L. Mao
- Peking University First Hospital, Beijing Shi, China
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Ma DB, Chen J, Xia Y, Zhu GJ, Ma XF, Zhou H, Gu YJ, Yu CJ, Zhu MS, Qian XY, Gao X. Inhibition of Myo6 gene expression by co‑expression of a mutant of transcription factor POU4F3 (BRN‑3C) in hair cells. Mol Med Rep 2014; 9:1185-90. [PMID: 24535414 DOI: 10.3892/mmr.2014.1953] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Accepted: 02/03/2014] [Indexed: 11/05/2022] Open
Abstract
An eight‑base pair (bp) deletion in the Pou4f3 gene in hair cells is associated with DFNA15, a hereditary form of hearing loss. To explore the pathological mechanisms underlying the development of DFNA15, the effect of the mutation in Pou4f3 on the activity of the myosin VI (Myo6) promoter, was investigated. The upstream regulatory sequence of Myo6 (2625 bp), consisting of an 1899 bp upstream sequence and a 727 bp intron 1 sequence, was amplified using polymerase chain reaction and subcloned into the pGL3‑Basic vector expressing firefly luciferase. For verification of inserted fragments, plasmids were subjected to restriction analysis and then sequenced. HEK293T human embryonic kidney cells were transiently transfected with renilla luciferase‑thymidine kinase vectors expressing Renilla luciferase and the Myo6 promoter‑driven firefly luciferase expressing vectors along with pIRES2‑enhanced green fluorescent protein (EGFP)‑Pou4f3 (expressing wild‑type Pou4f3) or pIRES2‑EGFP‑Pou4f3 (expressing the truncation mutant of Pou4f3). The relative luciferase activities were measured to determine the activity of the Myo6 promoter. The Myo6 promoter activity was not affected by co‑expression of wild‑type Pou4f3, as indicated by the comparable relative luciferase activities in the presence of the pIRES2‑EGFP‑Pou4f3 and the empty control vectors. However, co‑expression of mutated Pou4f3 significantly inhibited the activity of the Myo6 promoter to almost half of that of the control (P<0.001). The data suggests that mutated Pou4f3 has a negative role in the promoter activity of Myo6, and by extension, the expression of myosin VI, and this may be an underlying mechanism of DFNA15 hearing loss.
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Affiliation(s)
- Deng-Bin Ma
- Nanjing Drum Tower Hospital, Nanjing University Medical College, Nanjing, Jiangsu 210008, P.R. China
| | - Jie Chen
- Nanjing Drum Tower Hospital, Nanjing University Medical College, Nanjing, Jiangsu 210008, P.R. China
| | - Yang Xia
- Nanjing Drum Tower Hospital, Nanjing University Medical College, Nanjing, Jiangsu 210008, P.R. China
| | - Guang-Jie Zhu
- Nanjing Drum Tower Hospital, Nanjing University Medical College, Nanjing, Jiangsu 210008, P.R. China
| | - Xiao-Feng Ma
- Nanjing Drum Tower Hospital, Nanjing University Medical College, Nanjing, Jiangsu 210008, P.R. China
| | - Han Zhou
- Nanjing Drum Tower Hospital, Nanjing University Medical College, Nanjing, Jiangsu 210008, P.R. China
| | - Ya-Jun Gu
- Nanjing Drum Tower Hospital, Nanjing University Medical College, Nanjing, Jiangsu 210008, P.R. China
| | - Chen-Jie Yu
- Nanjing Drum Tower Hospital, Nanjing University Medical College, Nanjing, Jiangsu 210008, P.R. China
| | - Min-Sheng Zhu
- MOE Key Laboratory for Model Animal and Diseases Studies, Model Animal Research Center of Nanjing University, Nanjing, Jiangsu 210061, P.R. China
| | - Xiao-Yun Qian
- Nanjing Drum Tower Hospital, Nanjing University Medical College, Nanjing, Jiangsu 210008, P.R. China
| | - Xia Gao
- Nanjing Drum Tower Hospital, Nanjing University Medical College, Nanjing, Jiangsu 210008, P.R. China
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