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Leso V, Fontana L, Finiello F, De Cicco L, Luigia Ercolano M, Iavicoli I. Noise induced epigenetic effects: A systematic review. Noise Health 2021; 22:77-89. [PMID: 33402608 PMCID: PMC8000140 DOI: 10.4103/nah.nah_17_20] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Background: Noise-induced hearing loss (NIHL) is one of the leading causes of acquired sensorineural hearing loss. However, molecular mechanisms responsible for its pathogenesis remain to be elucidated. Epigenetic changes, i.e. DNA methylation, histone and microRNA expression modifications may function as a link between noise exposure and hearing loss. Therefore, the aim of the present review was to assess whether epigenetic alterations may serve as biomarkers of noise exposure or early effect. Materials and Methods: A systematic review of studies available in Pubmed, Scopus, and ISI Web of Science databases was performed. Results: Noise exposure was able to induce alterations in DNA methylation levels in workers and animal models, resulting in expression changes of genes related to hearing loss and also to extra-auditory effects. Differently expressed microRNAs were determined in NIHL workers compared to noise-exposed subjects with normal hearing, supporting their possible role as biomarkers of effect. Acoustic trauma affected histon acethylation and methylation levels in animals, suggesting their influence in the pathogenesis of acute noise-induced damage and their role as targets for potential therapeutic treatments. Conclusions: Although preliminary data suggest a relationship between noise and epigenetic effects, the limited number of studies, their different methodologies and the lack of adequate characterization of acoustic insults prevent definite conclusions. In this context, further research aimed to define the epigenetic impact of workplace noise exposure and the role of such alterations in predicting hearing loss may be important for the adoption of correct risk assessment and management strategies in occupational settings.
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Affiliation(s)
- Veruscka Leso
- Section of Occupational Medicine, Department of Public Health, University of Naples Federico II, Naples, Italy
| | - Luca Fontana
- Section of Occupational Medicine, Department of Public Health, University of Naples Federico II, Naples, Italy
| | - Ferdinando Finiello
- Section of Occupational Medicine, Department of Public Health, University of Naples Federico II, Naples, Italy
| | - Luigi De Cicco
- Section of Occupational Medicine, Department of Public Health, University of Naples Federico II, Naples, Italy
| | - Maria Luigia Ercolano
- Section of Occupational Medicine, Department of Public Health, University of Naples Federico II, Naples, Italy
| | - Ivo Iavicoli
- Section of Occupational Medicine, Department of Public Health, University of Naples Federico II, Naples, Italy
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Khoshsirat S, Abbaszadeh HA, Peyvandi AA, Heidari F, Peyvandi M, Simani L, Niknazar S. Apelin-13 prevents apoptosis in the cochlear tissue of noise-exposed rat via Sirt-1 regulation. J Chem Neuroanat 2021; 114:101956. [PMID: 33831513 DOI: 10.1016/j.jchemneu.2021.101956] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2020] [Revised: 04/04/2021] [Accepted: 04/04/2021] [Indexed: 12/11/2022]
Abstract
Noise-induced hearing loss (NIHL) is the second most common cause of acquired hearing loss. Acoustic trauma can cause oxidative damage in the cochlear hair cells (HCs) through apoptotic pathways. Apelin is a newly discovered neuropeptide with neuroprotective effects against the oxidative stress in neurodegenerative disorder. We investigated the preventive effects of apelin-13 on the cochlear HCs and spiral ganglion neurons (SGNs) against acoustic trauma via Sirtuin-1 (Sirt-1) regulation in rats. Animals were assigned to control, control + apelin-13 (50 or 100 μg/kg, ip), and noise exposure groups without any treatment or were administered apelin-13 (50 or 100 μg/kg, ip) and EX-527 (an inhibitor of Sirt-1) prior to each noise session. In the noise groups, 110 dB white noise was applied for 6 h per 5 days. Pre- and post-exposure distortion product otoacoustic emissions (DPOAE) and cochlear superoxide dismutase (SOD) activity were assessed. Western blot evaluated the cochlear protein expressions of Sirt-1, cleaved-caspase-3, Bax, and Bcl-2. Cell apoptosis was detected through TUNEL staining. Immunofluorescence was used to examine expression of HCs and SGNs specific protein. DPOAE level were significantly improved in the noise exposure group receiving 100 μg/kg apelin-13. At high doses, apelin augmented SOD levels in the rat cochlea subjected to noise. Apelin 100 markedly increased Sirt-1, and decreased cleaved- caspase-3 expression as well as Bax/Bcl-2 ratio in the cochlea tissue of noise-exposed rats. These findings suggest the promising therapeutic potential of apelin-13 for the prevention of noise-induced injury to cochlea and hearing loss.
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Affiliation(s)
- Shahrokh Khoshsirat
- Hearing Disorders Research Center, Loghman Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Hojjat-Allah Abbaszadeh
- Hearing Disorders Research Center, Loghman Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Laser Application in Medical Sciences Research Center, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Department of Anatomical Sciences and Biology, School of Medicine, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Ali Asghar Peyvandi
- Hearing Disorders Research Center, Loghman Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Fatemeh Heidari
- Hearing Disorders Research Center, Loghman Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran; Department of Audiology, School of Rehabilitation, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Maryam Peyvandi
- Hearing Disorders Research Center, Loghman Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Leila Simani
- Skull Base Research Center, Loghman Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Somayeh Niknazar
- Hearing Disorders Research Center, Loghman Hakim Hospital, Shahid Beheshti University of Medical Sciences, Tehran, Iran.
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Zheng Z, Zeng S, Liu C, Li W, Zhao L, Cai C, Nie G, He Y. The DNA methylation inhibitor RG108 protects against noise-induced hearing loss. Cell Biol Toxicol 2021; 37:751-771. [PMID: 33723744 PMCID: PMC8490244 DOI: 10.1007/s10565-021-09596-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2020] [Accepted: 02/22/2021] [Indexed: 11/29/2022]
Abstract
Background Noise-induced hearing loss represents a commonly diagnosed type of hearing disability, severely impacting the quality of life of individuals. The current work is aimed at assessing the effects of DNA methylation on noise-induced hearing loss. Methods Blocking DNA methyltransferase 1 (DNMT1) activity with a selective inhibitor RG108 or silencing DNMT1 with siRNA was used in this study. Auditory brainstem responses were measured at baseline and 2 days after trauma in mice to assess auditory functions. Whole-mount immunofluorescent staining and confocal microcopy of mouse inner ear specimens were performed to analyze noise-induced damage in cochleae and the auditory nerve at 2 days after noise exposure. Results The results showed that noise exposure caused threshold elevation of auditory brainstem responses and cochlear hair cell loss. Whole-mount cochlea staining revealed a reduction in the density of auditory ribbon synapses between inner hair cells and spiral ganglion neurons. Inhibition of DNA methyltransferase activity via a non-nucleoside specific pharmacological inhibitor, RG108, or silencing of DNA methyltransferase-1 with siRNA significantly attenuated ABR threshold elevation, hair cell damage, and the loss of auditory synapses. Conclusions This study suggests that inhibition of DNMT1 ameliorates noise-induced hearing loss and indicates that DNMT1 may be a promising therapeutic target. Graphical abstract Graphical Headlights • RG108 protected against noise-induced hearing loss • RG108 administration protected against noise-induced hair cell loss and auditory neural damage. • RG108 administration attenuated oxidative stress-induced DNA damage and subsequent apoptosis-mediated cell loss in the cochlea after noise exposure. ![]()
Supplementary Information The online version contains supplementary material available at 10.1007/s10565-021-09596-y.
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Affiliation(s)
- Zhiwei Zheng
- ENT institute and Department of Otorhinolaryngology, Eye & ENT Hospital, Fudan University, 83 Fenyang Road, Shanghai, 200031, China
- NHC Key Laboratory of Hearing Medicine (Fudan University), Shanghai, 200031, China
| | - Shan Zeng
- ENT institute and Department of Otorhinolaryngology, Eye & ENT Hospital, Fudan University, 83 Fenyang Road, Shanghai, 200031, China
- NHC Key Laboratory of Hearing Medicine (Fudan University), Shanghai, 200031, China
| | - Chang Liu
- ENT institute and Department of Otorhinolaryngology, Eye & ENT Hospital, Fudan University, 83 Fenyang Road, Shanghai, 200031, China
- NHC Key Laboratory of Hearing Medicine (Fudan University), Shanghai, 200031, China
| | - Wen Li
- ENT institute and Department of Otorhinolaryngology, Eye & ENT Hospital, Fudan University, 83 Fenyang Road, Shanghai, 200031, China
- NHC Key Laboratory of Hearing Medicine (Fudan University), Shanghai, 200031, China
| | - Liping Zhao
- ENT institute and Department of Otorhinolaryngology, Eye & ENT Hospital, Fudan University, 83 Fenyang Road, Shanghai, 200031, China
- NHC Key Laboratory of Hearing Medicine (Fudan University), Shanghai, 200031, China
| | - Chengfu Cai
- Department of Otorhinolaryngology Head and Neck Surgery, The First Affiliated Hospital, School of Medicine, Xiamen University, Xiamen, 361003, People's Republic of China
| | - Guohui Nie
- Department of Otolaryngology and Institute of Translational Medicine, Shenzhen Second People's Hospital/the First Affiliated Hospital of Shenzhen University Health Science Center, Shenzhen, 518035, China.
| | - Yingzi He
- ENT institute and Department of Otorhinolaryngology, Eye & ENT Hospital, Fudan University, 83 Fenyang Road, Shanghai, 200031, China.
- NHC Key Laboratory of Hearing Medicine (Fudan University), Shanghai, 200031, China.
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Xu FL, Cheng Y, Yan W. Up-regulation of autophagy and apoptosis of cochlear hair cells in mouse models for deafness. Arch Med Sci 2021; 17:535-541. [PMID: 33747288 PMCID: PMC7959062 DOI: 10.5114/aoms.2018.75348] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Accepted: 11/24/2017] [Indexed: 12/20/2022] Open
Abstract
INTRODUCTION Hearing loss is one of the most common sensory disorders. Recent findings have shown that the apoptotic program and autophagy are related to hearing loss. The aim of the study was to explore the effects of noise and cisplatin exposure on apoptosis and autophagy in the hair cells of the cochleae. MATERIAL AND METHODS C57BL/6 mice were randomly divided into 3 groups (n = 10 for each): the control group, the noise model group and the cisplatin model group. Auditory brainstem response (ABR) measurements were used to detect the hearing thresholds. TUNEL assay was used to evaluate cell apoptosis. Western blot and immunofluorescence were performed to examine the apoptosis- and autophagy-related proteins. RESULTS The mice exhibited substantial hearing loss after noise and cisplatin exposure. Additionally, more TUNEL positive cells were observed in the mice after noise and cisplatin exposure compared with the control group. Moreover, the protein expression levels of Beclin-1, LC3-II, Bax and cleaved caspase-3 were significantly increased, while the expression of Bcl-2 was notably decreased in the cochlea after noise (p = 0.0278, 0.0075, 0.0142, 0.0158, 0.0131 respectively) and cisplatin (p = 0.0220, 0.0075, 0.0024, 0.0161, 0.0452 respectively) exposure compared with the control group. Besides, the ratio of LC3-II/LC3-I was substantially higher in the mice treated by cisplatin (p = 0.0046) and noise (p = 0.0220) compared with the control group. CONCLUSIONS Our findings demonstrated for the first time that noise and cisplatin exposure promoted apoptosis and autophagy in the hair cells of the cochleae. This study provides new insights into the mechanisms of noise- or cisplatin-induced hearing loss.
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Affiliation(s)
- Fei-Long Xu
- Department of Otology, The First Affiliated Hospital of Zhengzhou University, Henan, China
| | - Yanjie Cheng
- Department of Otology, The First Affiliated Hospital of Zhengzhou University, Henan, China
| | - Wenya Yan
- Department of Otology, The First Affiliated Hospital of Zhengzhou University, Henan, China
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Tan X, Zhou Y, Agarwal A, Lim M, Xu Y, Zhu Y, O’Brien J, Tran E, Zheng J, Gius D, Richter CP. Systemic application of honokiol prevents cisplatin ototoxicity without compromising its antitumor effect. Am J Cancer Res 2020; 10:4416-4434. [PMID: 33415008 PMCID: PMC7783741] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Accepted: 11/02/2020] [Indexed: 06/12/2023] Open
Abstract
Cisplatin is a potent drug used in about 40% of cancer treatment but also leads to severe deafness in 60-80% of the cases. Although the mechanism is known to be related to the accumulation of reactive oxygen species (ROS), no drug or FDA approved treatment is currently available to prevent cisplatin ototoxicity. With this study, we show for the first time that honokiol (HNK), a pleiotropic poly-phenol prevents cisplatin-induced hearing loss. HNK also improves the wellbeing of the mice during the treatment, determined by the increase in the number of surviving animals. In a transgenic tumor mouse model, HNK does not hinder cisplatin's antitumor effect. The mechanism is related to the activation of sirtuin 3, a deacetylase in mitochondria essential for ROS detoxification. We expect a paradigm shift in cisplatin chemotherapy based on the current study and future clinical trials, where honokiol is applied to reduce side effects including hearing loss.
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Affiliation(s)
- Xiaodong Tan
- Department of Otolaryngology-Head and Neck Surgery, Feinberg School of Medicine, Northwestern University303 E Chicago Ave, Chicago, IL 60611, USA
| | - Yingjie Zhou
- Department of Communication Sciences and Disorders, Northwestern University633 Clark St, Evanston, IL 60208, USA
| | - Aditi Agarwal
- Department of Otolaryngology-Head and Neck Surgery, Feinberg School of Medicine, Northwestern University303 E Chicago Ave, Chicago, IL 60611, USA
| | - Michelle Lim
- Department of Otolaryngology-Head and Neck Surgery, Feinberg School of Medicine, Northwestern University303 E Chicago Ave, Chicago, IL 60611, USA
| | - Yingyue Xu
- Department of Otolaryngology-Head and Neck Surgery, Feinberg School of Medicine, Northwestern University303 E Chicago Ave, Chicago, IL 60611, USA
| | - Yueming Zhu
- Department of Oncology, Feinberg School of Medicine, Northwestern University303 E Chicago Ave, Chicago, IL 60611, USA
| | - Joseph O’Brien
- Department of Oncology, Feinberg School of Medicine, Northwestern University303 E Chicago Ave, Chicago, IL 60611, USA
| | - Elizabeth Tran
- Department of Oncology, Feinberg School of Medicine, Northwestern University303 E Chicago Ave, Chicago, IL 60611, USA
| | - Jing Zheng
- Department of Otolaryngology-Head and Neck Surgery, Feinberg School of Medicine, Northwestern University303 E Chicago Ave, Chicago, IL 60611, USA
- Department of Communication Sciences and Disorders, Northwestern University633 Clark St, Evanston, IL 60208, USA
- Knowles Hearing Center, Northwestern University633 Clark St, Evanston, IL 60208, USA
| | - David Gius
- Department of Radiation Oncology, Mays Cancer Center at UT Health San Antonio MD Anderson, Joe R. and Teresa Lozano Long School of Medicine7979 Wurzbach Road, San Antonio, TX 78229, USA
| | - Claus-Peter Richter
- Department of Otolaryngology-Head and Neck Surgery, Feinberg School of Medicine, Northwestern University303 E Chicago Ave, Chicago, IL 60611, USA
- Department of Communication Sciences and Disorders, Northwestern University633 Clark St, Evanston, IL 60208, USA
- Knowles Hearing Center, Northwestern University633 Clark St, Evanston, IL 60208, USA
- Department of Biomedical Engineering, Northwestern University633 Clark St, Evanston, IL 60208, USA
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Gao S, Cheng C, Wang M, Jiang P, Zhang L, Wang Y, Wu H, Zeng X, Wang H, Gao X, Ma Y, Chai R. Blebbistatin Inhibits Neomycin-Induced Apoptosis in Hair Cell-Like HEI-OC-1 Cells and in Cochlear Hair Cells. Front Cell Neurosci 2020; 13:590. [PMID: 32116554 PMCID: PMC7025583 DOI: 10.3389/fncel.2019.00590] [Citation(s) in RCA: 61] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Accepted: 12/27/2019] [Indexed: 12/23/2022] Open
Abstract
Aging, noise, and ototoxic drug-induced hair cell (HC) loss are the major causes of sensorineural hearing loss. Aminoglycoside antibiotics are commonly used in the clinic, but these often have ototoxic side effects due to the accumulation of oxygen-free radicals and the subsequent induction of HC apoptosis. Blebbistatin is a myosin II inhibitor that regulates microtubule assembly and myosin–actin interactions, and most research has focused on its ability to modulate cardiac or urinary bladder contractility. By regulating the cytoskeletal structure and reducing the accumulation of reactive oxygen species (ROS), blebbistatin can prevent apoptosis in many different types of cells. However, there are no reports on the effect of blebbistatin in HC apoptosis. In this study, we found that the presence of blebbistatin significantly inhibited neomycin-induced apoptosis in HC-like HEI-OC-1 cells. We also found that blebbistatin treatment significantly increased the mitochondrial membrane potential (MMP), decreased ROS accumulation, and inhibited pro-apoptotic gene expression in both HC-like HEI-OC-1 cells and explant-cultured cochlear HCs after neomycin exposure. Meanwhile, blebbistatin can protect the synaptic connections between HCs and cochlear spiral ganglion neurons. This study showed that blebbistatin could maintain mitochondrial function and reduce the ROS level and thus could maintain the viability of HCs after neomycin exposure and the neural function in the inner ear, suggesting that blebbistatin has potential clinic application in protecting against ototoxic drug-induced HC loss.
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Affiliation(s)
- Song Gao
- Department of Otolaryngology, Affiliated People's Hospital of Jiangsu University, Zhenjiang, China
| | - Cheng Cheng
- Department of Otolaryngology Head and Neck Surgery, Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University, Jiangsu Provincial Key Medical Discipline (Laboratory), Nanjing, China.,Research Institute of Otolaryngology, Nanjing, China
| | - Maohua Wang
- Department of Otolaryngology, Head and Neck Surgery, XiangYa School of Medicine, Central South University, Changsha, China
| | - Pei Jiang
- MOE Key Laboratory for Developmental Genes and Human Disease, Institute of Life Sciences, Southeast University, Nanjing, China
| | - Liyan Zhang
- MOE Key Laboratory for Developmental Genes and Human Disease, Institute of Life Sciences, Southeast University, Nanjing, China
| | - Ya Wang
- Department of Otolaryngology, Affiliated People's Hospital of Jiangsu University, Zhenjiang, China
| | - Huihui Wu
- Department of Otolaryngology, Affiliated People's Hospital of Jiangsu University, Zhenjiang, China
| | - Xuanfu Zeng
- Department of Otolaryngology, Affiliated People's Hospital of Jiangsu University, Zhenjiang, China
| | - Hui Wang
- Department of Otolaryngology Head and Neck Surgery, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China
| | - Xia Gao
- Department of Otolaryngology Head and Neck Surgery, Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University, Jiangsu Provincial Key Medical Discipline (Laboratory), Nanjing, China.,Research Institute of Otolaryngology, Nanjing, China
| | - Yongming Ma
- Department of Otolaryngology, Affiliated People's Hospital of Jiangsu University, Zhenjiang, China
| | - Renjie Chai
- MOE Key Laboratory for Developmental Genes and Human Disease, Institute of Life Sciences, Southeast University, Nanjing, China.,Co-Innovation Center of Neuroregeneration, Nantong University, Nantong, China.,Institute for Stem Cell and Regeneration, Chinese Academy of Science, Beijing, China.,Beijing Key Laboratory of Neural Regeneration and Repair, Capital Medical University, Beijing, China.,Jiangsu Province High-Tech Key Laboratory for Bio-Medical Research, Southeast University, Nanjing, China
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The histone deacetylase inhibitor sodium butyrate protects against noise-induced hearing loss in Guinea pigs. Neurosci Lett 2017; 660:140-146. [DOI: 10.1016/j.neulet.2017.09.036] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2017] [Revised: 09/11/2017] [Accepted: 09/15/2017] [Indexed: 12/15/2022]
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Campo P, Venet T, Thomas A, Cour C, Brochard C, Cosnier F. Neuropharmacological and cochleotoxic effects of styrene. Consequences on noise exposures. Neurotoxicol Teratol 2014; 44:113-20. [DOI: 10.1016/j.ntt.2014.05.009] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2014] [Revised: 05/21/2014] [Accepted: 05/28/2014] [Indexed: 10/25/2022]
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Andrews CD, Payne JF, Rise ML. Identification of a gene set to evaluate the potential effects of loud sounds from seismic surveys on the ears of fishes: a study with Salmo salar. JOURNAL OF FISH BIOLOGY 2014; 84:1793-1819. [PMID: 24814183 PMCID: PMC4277336 DOI: 10.1111/jfb.12398] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Accepted: 03/05/2014] [Indexed: 06/03/2023]
Abstract
Functional genomic studies were carried out on the inner ear of Atlantic salmon Salmo salar following exposure to a seismic airgun. Microarray analyses revealed 79 unique transcripts (passing background threshold), with 42 reproducibly up-regulated and 37 reproducibly down-regulated in exposed v. control fish. Regarding the potential effects on cellular energetics and cellular respiration, altered transcripts included those with roles in oxygen transport, the glycolytic pathway, the Krebs cycle and the electron transport chain. Of these, a number of transcripts encoding haemoglobins that are important in oxygen transport were up-regulated and among the most highly expressed. Up-regulation of transcripts encoding nicotinamide riboside kinase 2, which is also important in energy production and linked to nerve cell damage, points to evidence of neuronal damage in the ear following noise exposure. Transcripts related to protein modification or degradation also indicated potential damaging effects of sound on ear tissues. Notable in this regard were transcripts associated with the proteasome-ubiquitin pathway, which is involved in protein degradation, with the transcript encoding ubiquitin family domain-containing protein 1 displaying the highest response to exposure. The differential expression of transcripts observed for some immune responses could potentially be linked to the rupture of cell membranes. Meanwhile, the altered expression of transcripts for cytoskeletal proteins that contribute to the structural integrity of the inner ear could point to repair or regeneration of ear tissues including auditory hair cells. Regarding potential effects on hormones and vitamins, the protein carrier for thyroxine and retinol (vitamin A), namely transthyretin, was altered at the transcript expression level and it has been suggested from studies in mammalian systems that retinoic acid may play a role in the regeneration of damaged hair cells. The microarray experiment identified the transcript encoding growth hormone I as up-regulated by loud sound, supporting previous evidence linking growth hormone to hair cell regeneration in fishes. Quantitative (q) reverse transcription (RT) polymerase chain reaction (qRT-PCR) analyses confirmed dysregulation of some microarray-identified transcripts and in some cases revealed a high level of biological variability in the exposed group. These results support the potential utility of molecular biomarkers to evaluate the effect of seismic surveys on fishes with studies on the ears being placed in a priority category for development of exposure-response relationships. Knowledge of such relationships is necessary for addressing the question of potential size of injury zones.
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Affiliation(s)
- C D Andrews
- Fisheries and Oceans Canada, Northwest Atlantic Fisheries Centre, 80 East White Hills Rd, St John's, NL, A1C 5X1, Canada
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Receptor-interacting protein kinases modulate noise-induced sensory hair cell death. Cell Death Dis 2014; 5:e1262. [PMID: 24874734 PMCID: PMC4047918 DOI: 10.1038/cddis.2014.177] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/09/2014] [Revised: 02/18/2014] [Accepted: 02/26/2014] [Indexed: 12/20/2022]
Abstract
Receptor-interacting protein (RIP) kinases promote the induction of necrotic cell death pathways. Here we investigated signaling pathways in outer hair cells (OHCs) of adult male CBA/J mice exposed to noise that causes permanent threshold shifts, with a particular focus on RIP kinase-regulated necroptosis. One hour after noise exposure, nuclei of OHCs in the basal region of the cochlea displayed both apoptotic and necrotic features. RIP1 and RIP3 protein levels increased and caspase-8 was activated. Treatment with pan-caspase inhibitor ZVAD blocked the activation of caspase-8 and reduced the number of apoptotic nuclei, while increasing levels of RIP1, RIP3, and necrotic OHCs. Conversely, treatment with necrosis inhibitor necrostatin-1 (Nec-1) or RIP3 siRNA (siRIP3) diminished noise-induced increases in RIP1 and RIP3, and decreased necrotic OHC nuclei. This treatment also increased the number of apoptotic nuclei without increasing activation of caspase-8. Consistent with the elevation of levels of RIP1 and RIP3, noise-induced active AMPKα levels increased with ZVAD treatment, but decreased with Nec-1 and siRIP3 treatment. Furthermore, treatment with siRIP3 did not alter the activation of caspase-8, but instead increased activation of caspase-9 and promoted endonuclease G translocation into OHC nuclei. Finally, auditory brainstem response functional measurements and morphological assessment of OHCs showed that ZVAD treatment reduces noise-induced deficits. This protective function is potentiated when combined with siRIP3 treatment. In conclusion, noise-induced OHC apoptosis and necrosis are modulated by caspases and RIP kinases, respectively. Inhibition of either pathway shifts the prevalence of OHC death to the alternative pathway.
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Regeneration of stereocilia of hair cells by forced Atoh1 expression in the adult mammalian cochlea. PLoS One 2012; 7:e46355. [PMID: 23029493 PMCID: PMC3459923 DOI: 10.1371/journal.pone.0046355] [Citation(s) in RCA: 74] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2012] [Accepted: 08/29/2012] [Indexed: 02/02/2023] Open
Abstract
The hallmark of mechanosensory hair cells is the stereocilia, where mechanical stimuli are converted into electrical signals. These delicate stereocilia are susceptible to acoustic trauma and ototoxic drugs. While hair cells in lower vertebrates and the mammalian vestibular system can spontaneously regenerate lost stereocilia, mammalian cochlear hair cells no longer retain this capability. We explored the possibility of regenerating stereocilia in the noise-deafened guinea pig cochlea by cochlear inoculation of a viral vector carrying Atoh1, a gene critical for hair cell differentiation. Exposure to simulated gunfire resulted in a 60-70 dB hearing loss and extensive damage and loss of stereocilia bundles of both inner and outer hair cells along the entire cochlear length. However, most injured hair cells remained in the organ of Corti for up to 10 days after the trauma. A viral vector carrying an EGFP-labeled Atoh1 gene was inoculated into the cochlea through the round window on the seventh day after noise exposure. Auditory brainstem response measured one month after inoculation showed that hearing thresholds were substantially improved. Scanning electron microscopy revealed that the damaged/lost stereocilia bundles were repaired or regenerated after Atoh1 treatment, suggesting that Atoh1 was able to induce repair/regeneration of the damaged or lost stereocilia. Therefore, our studies revealed a new role of Atoh1 as a gene critical for promoting repair/regeneration of stereocilia and maintaining injured hair cells in the adult mammal cochlea. Atoh1-based gene therapy, therefore, has the potential to treat noise-induced hearing loss if the treatment is carried out before hair cells die.
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Apoptosis Progression in the Hair Cells in the Organ of Corti of GJB2 Conditional Knockout Mice. Clin Exp Otorhinolaryngol 2012; 5:132-8. [PMID: 22977709 PMCID: PMC3437413 DOI: 10.3342/ceo.2012.5.3.132] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2011] [Revised: 12/01/2011] [Accepted: 01/03/2012] [Indexed: 12/05/2022] Open
Abstract
Objectives Apoptosis may play an important role in the mechanism underlying the GJB2 gene conditional knockout (cCx26) mice cochlear cell death. The objective of this study was to explore the the damage mode of the outer hair cells (OHCs) and its real time point of apoptosis and provide information to further explore the role of apoptosis in the happening of hearing loss in cCx26 mice. Methods Cochleae from mice at various developmental stages (P8, P12, and P21) were dissected out and first used to be observed under the scanning electron microscope (SEM). Basilar membranes from mice at P8, P14, P18, and P21 were stained by fluorescein isothiocyanate-conjugated phalloidin and propidium iodide (PI) and examined under confocal microscope. Results The loss of OHCs of cCx26 knockout mice was first set between P12 and P21 under SEM. Whole mount phalloidin and PI staining revealed that obvious apoptotic appearance of the OHCs surface morphology was observed at P18. Conclusion Typical apoptotic morphology was found in the OHCs in the organ of Corti of the cCx26 mice at P18. This may provide information to further study the role of apoptosis in the occurrence of hearing loss of cCx26 mice.
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Jensen-Smith HC, Hallworth R, Nichols MG. Gentamicin rapidly inhibits mitochondrial metabolism in high-frequency cochlear outer hair cells. PLoS One 2012; 7:e38471. [PMID: 22715386 PMCID: PMC3371036 DOI: 10.1371/journal.pone.0038471] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2012] [Accepted: 05/10/2012] [Indexed: 01/08/2023] Open
Abstract
Aminoglycosides (AG), including gentamicin (GM), are the most frequently used antibiotics in the world and are proposed to cause irreversible cochlear damage and hearing loss (HL) in 1/4 of the patients receiving these life-saving drugs. Akin to the results of AG ototoxicity studies, high-frequency, basal turn outer hair cells (OHCs) preferentially succumb to multiple HL pathologies while inner hair cells (IHCs) are much more resilient. To determine if endogenous differences in IHC and OHC mitochondrial metabolism dictate differential sensitivities to AG-induced HL, IHC- and OHC-specific changes in mitochondrial reduced nicotinamide adenine dinucleotide (NADH) fluorescence during acute (1 h) GM treatment were compared. GM-mediated decreases in NADH fluorescence and succinate dehydrogenase activity were observed shortly after GM application. High-frequency basal turn OHCs were found to be metabolically biased to rapidly respond to alterations in their microenvironment including GM and elevated glucose exposures. These metabolic biases may predispose high-frequency OHCs to preferentially produce cell-damaging reactive oxygen species during traumatic challenge. Noise-induced and age-related HL pathologies share key characteristics with AG ototoxicity, including preferential OHC loss and reactive oxygen species production. Data from this report highlight the need to address the role of mitochondrial metabolism in regulating AG ototoxicity and the need to illuminate how fundamental differences in IHC and OHC metabolism may dictate differences in HC fate during multiple HL pathologies.
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Affiliation(s)
- Heather C Jensen-Smith
- Department of Biomedical Sciences, Creighton University, Omaha, Nebraska, United States of America.
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Xiong M, He Q, Lai H, Wang J. Astragaloside IV inhibits apoptotic cell death in the guinea pig cochlea exposed to impulse noise. Acta Otolaryngol 2012; 132:467-74. [PMID: 22217340 DOI: 10.3109/00016489.2011.643457] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
CONCLUSION The results suggest that the beneficial effect of astragaloside IV on impulse noise-induced hearing loss may be due to its ability to inhibit reactive oxygen species (ROS) and prevent apoptosis. OBJECTIVE Astragaloside IV is the major active constituent of Astragalus membranaceus, which has been widely used for the treatment of diseases in China for its antioxidant properties. ROS and apoptosis are involved in damage induced by impulse noise trauma. We aimed to investigate if the beneficial effects of astragaloside IV on cochlea exposed to impulse noise are associated with the inhibition of ROS and the decrease in apoptosis. METHODS 4-Hydroxynonenal (HNE) was used as the marker of ROS. Active-caspase-3 (cas-3) served as a marker for apoptosis. 4HNE and cas-3 were determined immunohistochemically. Guinea pigs in the experimental group were administered astragaloside IV intragastrically. Auditory thresholds were assessed by sound-evoked auditory brainstem response (ABR) 72 h before and after exposure to impulse noise. RESULTS The results showed that astragaloside IV significantly reduced ABR deficits, and decreased the expression of ROS and cas-3.
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Affiliation(s)
- Min Xiong
- Department of Otolaryngology, General Hospital of PLA Guangzhou Command, China.
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Abstract
According to current knowledge, it must be assumed that temporary idiopathic hearing loss and its spontaneous remission are based on mechanical and/or pathological alterations in the inner ear. The causal mechanisms might be based on inter-individual variations. Induced by dose-dependent activators, temporary as well as permanent damage might occur. Sudden hearing loss may be initiated by an increase in the local nitric oxide (NO) concentration. Spontaneous remission, i.e. functional restoration, can be explained by a local decrease in the NO concentration. In this context, regulatory systems such as the gap-junction system, blood vessels or synapses might be affected. In addition, alterations in the hormone level of estrogen and mineralocorticoids, as well as cellular glutathione and vitamin levels, might lead to temporary alterations in the inner ear. Recent experimental findings indicate a role for the shuttle protein Survivin in the spontaneous remission of sudden hearing loss.
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Missing mitochondrial Mpv17 gene function induces tissue-specific cell-death pathway in the degenerating inner ear. Cell Tissue Res 2012; 347:343-56. [PMID: 22322422 DOI: 10.1007/s00441-012-1326-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2011] [Accepted: 01/11/2012] [Indexed: 12/11/2022]
Abstract
The Mpv17 gene encodes a mitochondrial inner-membrane protein that has been implicated in the metabolism of reactive oxygen species. The loss of function in Mpv17-/- mice leads to early sensorineural deafness associated with severe inner ear degeneration and late onset of kidney failure. The present study demonstrates that the onset of the degeneration of the cochlear neuroepithelia is related to the onset of auditory function and appears to be first restricted to the outer hair cells (OHC), which subsequently undergo rapid degeneration. At the age of 18 days, the OHC lateral membrane degenerates and extensive vacuolization of the cytoplasm is followed by lysis of the OHCs. Such degenerative processes have been seen for the first time in relation to auditory dysfunction. The structural degeneration pattern of the OHC appears to be similar to the described paraptotic processes (an alternative form of programmed cell death) discussed in the literature as a cause of cytoplasmic neurodegeneration. In contrast, the melanocyte-like intermediate cells that are of neural crest origin and that are located in the stria vascularis, undergo apoptosis, as documented ultrastructurally. A lack of Mpv17 protein function in mitochondria thus seems to initiate tissue-specific cell-death pathways resulting in the pathology seen during the degeneration process.
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Late-phase recovery in the cochlear lateral wall following severe degeneration by acute energy failure. Brain Res 2011; 1419:1-11. [DOI: 10.1016/j.brainres.2011.08.062] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2011] [Revised: 07/26/2011] [Accepted: 08/24/2011] [Indexed: 11/24/2022]
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Geranylgeranylacetone ameliorates acute cochlear damage caused by 3-nitropropionic acid. Neurotoxicology 2010; 31:317-25. [DOI: 10.1016/j.neuro.2010.03.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2009] [Revised: 03/02/2010] [Accepted: 03/03/2010] [Indexed: 11/22/2022]
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