1
|
Li G, Gao Y, Wu H, Zhao T. Gentamicin administration leads to synaptic dysfunction in inner hair cells. Toxicol Lett 2024; 391:86-99. [PMID: 38101494 DOI: 10.1016/j.toxlet.2023.12.007] [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: 08/18/2023] [Revised: 11/17/2023] [Accepted: 12/11/2023] [Indexed: 12/17/2023]
Abstract
Ototoxicity is a major side effect of aminoglycosides, which can cause irreversible hearing loss. Previous studies on aminoglycoside-induced ototoxicity have primarily focused on the loss of sensory hair cells. Recent investigations have revealed that aminoglycosides can also lead to the loss of ribbon synapses in inner hair cells (IHCs). However, the functional implications of ribbon synapse loss and the underlying mechanisms remain unclear. In this study, we intraperitoneally injected C57BL/6 J mice with 300 mg/kg gentamicin once daily for 3, 10, and 20 days. Then, we performed immunofluorescence staining, patch-clamp recording, proteomics analysis and western blotting to characterize the changes in ribbon synapses in IHCs and the associated mechanisms. After gentamicin treatment, the auditory brainstem response (ABR) threshold was elevated, and the ABR wave I amplitude was decreased. We also observed loss of ribbon synapses in IHCs. Interestingly, ribbon synapse loss occurred on both the modiolar and pillar sides of IHCs. Whole-cell patch-clamp recordings in IHCs revealed a reduction in the calcium current amplitude, along with a shifted half-activation voltage and altered calcium voltage dependency. Moreover, exocytosis of IHCs was reduced, consistent with the reduction in the ABR wave I amplitude. Through proteomic analysis, western blotting, and immunofluorescence staining, we found that gentamicin treatment resulted in downregulation of myosin VI, a protein crucial for synaptic vesicle recycling and replenishment in IHCs. Furthermore, we evaluated the kinetics of endocytosis and found a significant reduction in IHC exocytosis, possibly reflecting the impact of myosin VI downregulation on synaptic vesicle recycling. In summary, our findings demonstrate that gentamicin treatment leads to synaptic dysfunction in IHCs, highlighting the important role of myosin VI downregulation in gentamicin-induced synaptic damage.
Collapse
Affiliation(s)
- Gen Li
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Yunge Gao
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Hao Wu
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China.
| | - Ting Zhao
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China.
| |
Collapse
|
2
|
Lee SY, Kim MY, Han JH, Park SS, Yun Y, Jee SC, Han JJ, Lee JH, Seok H, Choi BY. Ramifications of POU4F3 variants associated with autosomal dominant hearing loss in various molecular aspects. Sci Rep 2023; 13:12584. [PMID: 37537203 PMCID: PMC10400627 DOI: 10.1038/s41598-023-38272-w] [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: 03/05/2023] [Accepted: 07/06/2023] [Indexed: 08/05/2023] Open
Abstract
POU4F3, a member of the POU family of transcription factors, commonly causes autosomal dominant deafness. Exome sequencing was used to identify four novel variants in POU4F3 (NM_002700.2), including c.564dupA: p.Ala189SerfsTer26, c.743T > C:p.Leu248Pro, c.879C > A:p.Phe293Leu, and c.952G > A:p.Val318Met, and diverse aspects of the molecular consequences of their protein expression, stability, subcellular localization, and transcriptional activity were investigated. The expression of three mutant proteins, encoded by missense variants, was reduced compared to the wild-type protein, demonstrating that the mutants were unstable and vulnerable to degradation. Additionally, all the mutant proteins had distinct subcellular localization patterns. A mutant protein carrying p.Ala189SerfsTer26, in which both mono- and bi-partite nuclear localization signals were disrupted, showed abnormal subcellular localization. Resultantly, all the mutant proteins significantly reduced the transcriptional activity required to regulate the downstream target gene expression. Furthermore, we identified the altered expression of 14 downstream target genes associated with inner ear development using patient-derived lymphoblastoid cell lines. There was a significant correlation of the expression profile between patient-derived cells and the cochlear hair cells, which provided a breakthrough for cases where the collection of human cochlear samples for transcriptome studies was unfeasible. This study expanded the genotypic spectrum of POU4F3 in DFNA15, and further refined the molecular mechanisms underlying POU4F3-associated DFNA15.
Collapse
Affiliation(s)
- Sang-Yeon Lee
- Department of Genomic Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
- Sensory Organ Research Institute, Seoul National University Medical Research Center, Seoul, Republic of Korea
| | - Min Young Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 463-707, Republic of Korea
| | - Jin Hee Han
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 463-707, Republic of Korea
| | - Sang Soo Park
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Yejin Yun
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Seung-Cheol Jee
- Department of Transdisciplinary Research and Collaboration, Genomics Core Facility, Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea
| | - Jae Joon Han
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Jun Ho Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Heeyoung Seok
- Department of Transdisciplinary Research and Collaboration, Genomics Core Facility, Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea.
| | - Byung Yoon Choi
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 463-707, Republic of Korea.
- Sensory Organ Research Institute, Seoul National University Medical Research Center, Seoul, Republic of Korea.
| |
Collapse
|
3
|
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.
Collapse
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)
| |
Collapse
|
4
|
Four Novel Variants in POU4F3 Cause Autosomal Dominant Nonsyndromic Hearing Loss. Neural Plast 2020; 2020:6137083. [PMID: 32684921 PMCID: PMC7349627 DOI: 10.1155/2020/6137083] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2020] [Revised: 05/16/2020] [Accepted: 06/09/2020] [Indexed: 12/30/2022] Open
Abstract
Hereditary hearing loss is one of the most common sensory disabilities worldwide. Mutation of POU domain class 4 transcription factor 3 (POU4F3) is considered the pathogenic cause of autosomal dominant nonsyndromic hearing loss (ADNSHL), designated as autosomal dominant nonsyndromic deafness 15. In this study, four novel variants in POU4F3, c.696G>T (p.Glu232Asp), c.325C>T (p.His109Tyr), c.635T>C (p.Leu212Pro), and c.183delG (p.Ala62Argfs∗22), were identified in four different Chinese families with ADNSHL by targeted next-generation sequencing and Sanger sequencing. Based on the American College of Medical Genetics and Genomics guidelines, c.183delG (p.Ala62Argfs∗22) is classified as a pathogenic variant, c.696G>T (p.Glu232Asp) and c.635T>C (p.Leu212Pro) are classified as likely pathogenic variants, and c.325C>T (p.His109Tyr) is classified as a variant of uncertain significance. Based on previous reports and the results of this study, we speculated that POU4F3 pathogenic variants are significant contributors to ADNSHL in the East Asian population. Therefore, screening of POU4F3 should be a routine examination for the diagnosis of hereditary hearing loss.
Collapse
|