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Wagle SR, Kovacevic B, Ionescu CM, Foster T, Jones M, Mikov M, Wise A, Mooranian A, Al-Salami H. Probucol-bile acid based nanoparticles protect auditory cells from oxidative stress: an in vitro study. Ther Deliv 2024; 15:237-252. [PMID: 38469721 DOI: 10.4155/tde-2023-0099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/13/2024] Open
Abstract
Aim: Excessive free radicals contribute to oxidative stress and mitochondrial dysfunction in sensorineural hearing loss (SNHL). The antioxidant probucol holds promise, but its limited bioavailability and inner ear barriers hinder effective SNHL treatment. Methodology: We addressed this by developing probucol-loaded nanoparticles with polymers and lithocholic acid and tested them on House Ear Institute-Organ of Corti cells. Results: Probucol-based nanoparticles effectively reduced oxidative stress-induced apoptosis, enhanced cellular viability, improved probucol uptake and promoted mitochondrial function. Additionally, they demonstrated the capacity to reduce reactive oxygen species through the nuclear factor erythroid 2-related factor 2/heme oxygenase-1 pathway. Conclusion: This innovative nanoparticle system holds the potential to prevent oxidative stress-related hearing impairment, providing an effective solution for SNHL.
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Affiliation(s)
- Susbin Raj Wagle
- The Biotechnology & Drug Development Research Laboratory, Curtin Medical School & Curtin Health Innovation Research Institute, Curtin University, Bentley 6102, Perth, Western Australia, Australia
| | - Bozica Kovacevic
- The Biotechnology & Drug Development Research Laboratory, Curtin Medical School & Curtin Health Innovation Research Institute, Curtin University, Bentley 6102, Perth, Western Australia, Australia
| | - Corina Mihaela Ionescu
- The Biotechnology & Drug Development Research Laboratory, Curtin Medical School & Curtin Health Innovation Research Institute, Curtin University, Bentley 6102, Perth, Western Australia, Australia
| | - Thomas Foster
- The Biotechnology & Drug Development Research Laboratory, Curtin Medical School & Curtin Health Innovation Research Institute, Curtin University, Bentley 6102, Perth, Western Australia, Australia
| | - Melissa Jones
- The Biotechnology & Drug Development Research Laboratory, Curtin Medical School & Curtin Health Innovation Research Institute, Curtin University, Bentley 6102, Perth, Western Australia, Australia
| | - Momir Mikov
- Department of Pharmacology, Toxicology & Clinical Pharmacology, Faculty of Medicine, University of Novi Sad, Novi Sad (Hajduk Veljkova 3, 21101), Serbia
| | | | - Armin Mooranian
- The Biotechnology & Drug Development Research Laboratory, Curtin Medical School & Curtin Health Innovation Research Institute, Curtin University, Bentley 6102, Perth, Western Australia, Australia
- School of Pharmacy, University of Otago, Dunedin, Otago, New Zealand
| | - Hani Al-Salami
- The Biotechnology & Drug Development Research Laboratory, Curtin Medical School & Curtin Health Innovation Research Institute, Curtin University, Bentley 6102, Perth, Western Australia, Australia
- Medical School, University of Western Australia, Perth, Western Australia, Australia
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2
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Kishimoto-Urata M, Urata S, Fujimoto C, Yamasoba T. Role of Oxidative Stress and Antioxidants in Acquired Inner Ear Disorders. Antioxidants (Basel) 2022; 11:1469. [PMID: 36009187 PMCID: PMC9405327 DOI: 10.3390/antiox11081469] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 07/25/2022] [Accepted: 07/25/2022] [Indexed: 01/27/2023] Open
Abstract
Oxygen metabolism in the mitochondria is essential for biological activity, and reactive oxygen species (ROS) are produced simultaneously in the cell. Once an imbalance between ROS production and degradation (oxidative stress) occurs, cells are damaged. Sensory organs, especially those for hearing, are constantly exposed during daily life. Therefore, almost all mammalian species are liable to hearing loss depending on their environment. In the auditory pathway, hair cells, spiral ganglion cells, and the stria vascularis, where mitochondria are abundant, are the main targets of ROS. Excessive generation of ROS in auditory sensory organs is widely known to cause sensorineural hearing loss, and mitochondria-targeted antioxidants are candidates for treatment. This review focuses on the relationship between acquired hearing loss and antioxidant use to provide an overview of novel antioxidants, namely medicines, supplemental nutrients, and natural foods, based on clinical, animal, and cultured-cell studies.
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Affiliation(s)
| | | | | | - Tatsuya Yamasoba
- Department of Otolaryngology, Graduate School of Medicine, The University of Tokyo, Tokyo 1138655, Japan; (M.K.-U.); (S.U.); (C.F.)
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Henton A, Tzounopoulos T. What's the buzz? The neuroscience and the treatment of tinnitus. Physiol Rev 2021; 101:1609-1632. [PMID: 33769102 DOI: 10.1152/physrev.00029.2020] [Citation(s) in RCA: 42] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Tinnitus is a pervasive public health issue that affects ∼15% of the United States population. Similar estimates have also been shown on a global scale, with similar prevalence found in Europe, Asia, and Africa. The severity of tinnitus is heterogeneous, ranging from mildly bothersome to extremely disruptive. In the United States, ∼10-20% of individuals who experience tinnitus report symptoms that severely reduce their quality of life. Due to the huge personal and societal burden, in the last 20 yr a concerted effort on basic and clinical research has significantly advanced our understanding and treatment of this disorder. Yet, neither full understanding, nor cure exists. We know that tinnitus is the persistent involuntary phantom percept of internally generated nonverbal indistinct noises and tones, which in most cases is initiated by acquired hearing loss and maintained only when this loss is coupled with distinct neuronal changes in auditory and extra-auditory brain networks. Yet, the exact mechanisms and patterns of neural activity that are necessary and sufficient for the perceptual generation and maintenance of tinnitus remain incompletely understood. Combinations of animal model and human research will be essential in filling these gaps. Nevertheless, the existing progress in investigating the neurophysiological mechanisms has improved current treatment and highlighted novel targets for drug development and clinical trials. The aim of this review is to thoroughly discuss the current state of human and animal tinnitus research, outline current challenges, and highlight new and exciting research opportunities.
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Affiliation(s)
- A Henton
- Pittsburgh Hearing Research Center and Department of Otolaryngology, University of Pittsburgh, Pittsburgh, Pennsylvania.,Center for Neuroscience, University of Pittsburgh, Pittsburgh, Pennsylvania
| | - T Tzounopoulos
- Pittsburgh Hearing Research Center and Department of Otolaryngology, University of Pittsburgh, Pittsburgh, Pennsylvania.,Center for Neuroscience, University of Pittsburgh, Pittsburgh, Pennsylvania
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4
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Karimian M, Behjati M, Barati E, Ehteram T, Karimian A. CYP1A1 and GSTs common gene variations and presbycusis risk: a genetic association analysis and a bioinformatics approach. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:42600-42610. [PMID: 32712936 DOI: 10.1007/s11356-020-10144-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2020] [Accepted: 07/15/2020] [Indexed: 06/11/2023]
Abstract
Antioxidant enzymes such as glutathione S-transferases (GSTs) and cytochromes P450 (CYPs) are involved in the metabolism and detoxification of cytotoxic compounds, as well as the elimination of reactive oxygen species (ROS). Therefore, alterations in the structure of these enzymes could result in prolonged production of ROS with subsequent risk of development of disorders such as presbycusis. This study aimed to investigate the association between CYP1A1 (rs4646903, rs1048943) and GSTs (GSTM1-deletion, GSTT1-deletion, GSTP1-rs1695) with presbycusis risk in an Iranian population which was followed by an in silico approach. In a case-control study, 280 subjects including 140 cases with presbycusis and 140 healthy controls were enrolled. Genotypes of single-nucleotide polymorphisms (SNPs) were detected by PCR-RFLP method and the genotype of the above mentioned deletions was determined by touchdown PCR. Some bioinformatics tools were employed to evaluate the impact of SNPs on the gene function. SNP analysis revealed that there are significant associations between rs1048943 (AG vs. AA: OR = 2.46, 95%CI = 1.30-4.65, p = 0.006; GG + AG vs. AA: OR = 2.53, 95%CI = 1.36-4.69, p = 0.003; G vs. A: OR = 2.36, 95%CI = 1.33-4.17, p = 0.003) and rs4646903 (C vs. T: OR = 1.45, 95%CI = 1.02-2.06, p = 0.040) variations and increased risk of presbycusis. However, there was no significant association between rs1695 and presbycusis risk. Also, significant associations were observed between GSTM1 (OR = 4.28, 95%CI = 1.18-15.52, p = 0.027) and GSTT1 (OR = 1.64, 95%CI = 1.02-2.65, p = 0.041) deletions and elevated risk of presbycusis. Moreover, the combination analysis revealed a significant association between GSTM1+/GSTT1- genotype and presbycusis susceptibility (OR = 1.63, 95%CI = 1.00-2.67, p = 0.049). In silico analysis revealed that the rs1048943 SNP could influence significantly on the RNA structure of CYP1A1 (distance: 0.1454; p value: 0.1799). Based on our findings, the rs4646903, rs1048943 SNPs as well as GSTM1 and GSTT1 deletions could be considered as genetic risk factors for the development and progression of presbycusis.
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Affiliation(s)
- Mohammad Karimian
- Department of Molecular and Cell Biology, Faculty of Basic Sciences, University of Mazandaran, Babolsar, 47416-95447, Iran.
| | - Mohaddeseh Behjati
- Rajaie Cardiovascular Medical and Research Center, Iran University of Medical Sciences, Tehran, Iran
| | - Erfaneh Barati
- Department of Anatomy, School of Medicine, Kashan University of Medical Sciences, Kashan, Iran
| | - Tayyebeh Ehteram
- Department of ENT, School of Medicine, Kashan University of Medical Science, Qotb-e Ravandi Blvd, Kashan, 8715988141, Iran
| | - Ali Karimian
- Department of Anatomy, School of Medicine, Kashan University of Medical Sciences, Kashan, Iran.
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5
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Alvarado JC, Fuentes-Santamaría V, Melgar-Rojas P, Gabaldón-Ull MC, Cabanes-Sanchis JJ, Juiz JM. Oral Antioxidant Vitamins and Magnesium Limit Noise-Induced Hearing Loss by Promoting Sensory Hair Cell Survival: Role of Antioxidant Enzymes and Apoptosis Genes. Antioxidants (Basel) 2020; 9:E1177. [PMID: 33255728 PMCID: PMC7761130 DOI: 10.3390/antiox9121177] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2020] [Revised: 11/16/2020] [Accepted: 11/19/2020] [Indexed: 01/01/2023] Open
Abstract
Noise induces oxidative stress in the cochlea followed by sensory cell death and hearing loss. The proof of principle that injections of antioxidant vitamins and Mg2+ prevent noise-induced hearing loss (NIHL) has been established. However, effectiveness of oral administration remains controversial and otoprotection mechanisms are unclear. Using auditory evoked potentials, quantitative PCR, and immunocytochemistry, we explored effects of oral administration of vitamins A, C, E, and Mg2+ (ACEMg) on auditory function and sensory cell survival following NIHL in rats. Oral ACEMg reduced auditory thresholds shifts after NIHL. Improved auditory function correlated with increased survival of sensory outer hair cells. In parallel, oral ACEMg modulated the expression timeline of antioxidant enzymes in the cochlea after NIHL. There was increased expression of glutathione peroxidase-1 and catalase at 1 and 10 days, respectively. Also, pro-apoptotic caspase-3 and Bax levels were diminished in ACEMg-treated rats, at 10 and 30 days, respectively, following noise overstimulation, whereas, at day 10 after noise exposure, the levels of anti-apoptotic Bcl-2, were significantly increased. Therefore, oral ACEMg improves auditory function by limiting sensory hair cell death in the auditory receptor following NIHL. Regulation of the expression of antioxidant enzymes and apoptosis-related proteins in cochlear structures is involved in such an otoprotective mechanism.
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Affiliation(s)
- Juan C. Alvarado
- Instituto de Investigación en Discapacidades Neurológicas (IDINE), School of Medicine, Universidad de Castilla-La Mancha, 02008 Albacete, Spain; (V.F.-S.); (P.M.-R.); (M.C.G.-U.); (J.J.C.-S.)
| | - Verónica Fuentes-Santamaría
- Instituto de Investigación en Discapacidades Neurológicas (IDINE), School of Medicine, Universidad de Castilla-La Mancha, 02008 Albacete, Spain; (V.F.-S.); (P.M.-R.); (M.C.G.-U.); (J.J.C.-S.)
| | - Pedro Melgar-Rojas
- Instituto de Investigación en Discapacidades Neurológicas (IDINE), School of Medicine, Universidad de Castilla-La Mancha, 02008 Albacete, Spain; (V.F.-S.); (P.M.-R.); (M.C.G.-U.); (J.J.C.-S.)
| | - María C. Gabaldón-Ull
- Instituto de Investigación en Discapacidades Neurológicas (IDINE), School of Medicine, Universidad de Castilla-La Mancha, 02008 Albacete, Spain; (V.F.-S.); (P.M.-R.); (M.C.G.-U.); (J.J.C.-S.)
| | - José J. Cabanes-Sanchis
- Instituto de Investigación en Discapacidades Neurológicas (IDINE), School of Medicine, Universidad de Castilla-La Mancha, 02008 Albacete, Spain; (V.F.-S.); (P.M.-R.); (M.C.G.-U.); (J.J.C.-S.)
| | - José M. Juiz
- Instituto de Investigación en Discapacidades Neurológicas (IDINE), School of Medicine, Universidad de Castilla-La Mancha, 02008 Albacete, Spain; (V.F.-S.); (P.M.-R.); (M.C.G.-U.); (J.J.C.-S.)
- Department of Otolaryngology, Hannover Medical School, NIFE-VIANNA, Cluster of Excellence Hearing4all-German Research Foundation, 30625 Hannover, Germany
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6
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Alvarado JC, Fuentes-Santamaría V, Juiz JM. Antioxidants and Vasodilators for the Treatment of Noise-Induced Hearing Loss: Are They Really Effective? Front Cell Neurosci 2020; 14:226. [PMID: 32792910 PMCID: PMC7387569 DOI: 10.3389/fncel.2020.00226] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2020] [Accepted: 06/29/2020] [Indexed: 12/26/2022] Open
Abstract
We live in a world continuously immersed in noise, an environmental, recreational, and occupational factor present in almost every daily human activity. Exposure to high-level noise could affect the auditory function of individuals at any age, resulting in a condition called noise-induced hearing loss (NIHL). Given that by 2018, more than 400 million people worldwide were suffering from disabling hearing loss and that about one-third involved noise over-exposure, which represents more than 100 million people, this hearing impairment represents a serious health problem. As of today, there are no therapeutic measures available to treat NIHL. Conventional preventive measures, including public awareness and education and physical barriers to noise, do not seem to suffice, as the population is still being affected by damaging noise levels. Therefore, it is necessary to develop or test pharmacological agents that may prevent and/or diminish the impact of noise on hearing. Data availability about the pathophysiological processes involved in triggering NIHL has allowed researchers to use compounds, that could act as effective therapies, by targeting specific mechanisms such as the excess generation of free radicals and blood flow restriction to the cochlea. In this review, we summarize the advantages/disadvantages of these therapeutic agents, providing a critical view of whether they could be effective in the human clinic.
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Affiliation(s)
- Juan Carlos Alvarado
- Facultad de Medicina, Instituto de Investigación en Discapacidades, Neurológicas (IDINE), Universidad de Castilla-La Mancha, Albacete, Spain
| | - Verónica Fuentes-Santamaría
- Facultad de Medicina, Instituto de Investigación en Discapacidades, Neurológicas (IDINE), Universidad de Castilla-La Mancha, Albacete, Spain
| | - José M Juiz
- Facultad de Medicina, Instituto de Investigación en Discapacidades, Neurológicas (IDINE), Universidad de Castilla-La Mancha, Albacete, Spain.,Department of Otolaryngology, Hannover Medical School, NIFE-VIANNA, Cluster of Excellence Hearing4all-German Research Foundation, Hannover, Germany
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7
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Wang H, Zhao H, Sun K, Huang X, Jin L, Feng J. Evolutionary Basis of High-Frequency Hearing in the Cochleae of Echolocators Revealed by Comparative Genomics. Genome Biol Evol 2020; 12:3740-3753. [PMID: 31730196 PMCID: PMC7145703 DOI: 10.1093/gbe/evz250] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/14/2019] [Indexed: 12/25/2022] Open
Abstract
High-frequency hearing is important for the survival of both echolocating bats and whales, but our understanding of its genetic basis is scattered and segmented. In this study, we combined RNA-Seq and comparative genomic analyses to obtain insights into the comprehensive gene expression profile of the cochlea and the adaptive evolution of hearing-related genes. A total of 144 genes were found to have been under positive selection in various species of echolocating bats and toothed whales, 34 of which were identified to be related to hearing behavior or auditory processes. Subsequently, multiple physiological processes associated with those genes were found to have adaptively evolved in echolocating bats and toothed whales, including cochlear bony development, antioxidant activity, ion balance, and homeostatic processes, along with signal transduction. In addition, abundant convergent/parallel genes and sites were detected between different pairs of echolocator species; however, no specific hearing-related physiological pathways were enriched by them and almost all of the convergent/parallel signals were selectively neutral, as previously reported. Notably, two adaptive parallel evolved sites in TECPR2 were shown to have been under positive selection, indicating their functional importance for the evolution of echolocation and high-frequency hearing in laryngeal echolocating bats. This study deepens our understanding of the genetic bases underlying high-frequency hearing in the cochlea of echolocating bats and toothed whales.
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Affiliation(s)
- Hui Wang
- Jilin Provincial Key Laboratory of Animal Resource Conservation and Utilization, Northeast Normal University, Changchun, China.,College of Life Science, Jilin Agricultural University, Changchun, China
| | - Hanbo Zhao
- Jilin Provincial Key Laboratory of Animal Resource Conservation and Utilization, Northeast Normal University, Changchun, China
| | - Keping Sun
- Jilin Provincial Key Laboratory of Animal Resource Conservation and Utilization, Northeast Normal University, Changchun, China
| | - Xiaobin Huang
- Vector Laboratory for Zoonosis Control and Prevention, Dali University, China
| | - Longru Jin
- Jilin Provincial Key Laboratory of Animal Resource Conservation and Utilization, Northeast Normal University, Changchun, China
| | - Jiang Feng
- Jilin Provincial Key Laboratory of Animal Resource Conservation and Utilization, Northeast Normal University, Changchun, China.,College of Life Science, Jilin Agricultural University, Changchun, China
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8
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Pourabdian S, Yazdanirad S, Lotfi S, Golshiri P, Mahaki B. Prevalence hearing loss of truck and bus drivers in a cross-sectional study of 65533 subjects. Environ Health Prev Med 2019; 24:78. [PMID: 31861971 PMCID: PMC6925449 DOI: 10.1186/s12199-019-0831-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2019] [Accepted: 11/14/2019] [Indexed: 12/20/2022] Open
Abstract
Background Noise pollution is one of the most important occupational pollutants in heavy-vehicle drivers. Therefore, this epidemiological research was conducted with the aim of determining the prevalence of hearing loss in heavy-vehicle drivers in Iran. Methods This cross-sectional research was conducted on 65,533 heavy-vehicle drivers including truck and intercity bus drivers from February 2006 to March 2016. The air and bone threshold of pure tone was measured for each ear at 0.5, 1, 2, 3, 4, 6, and 8 kHz by a skillful radiology expert. The obtained data from this research was analyzed in SPSS software using statistical tests such as descriptive analysis and paired t test. Results Mean (standard deviation) of hearing loss in left and right ears of all people was 23.02 (8.25) and 22.48 (7.86), respectively. Paired t test showed that hearing loss difference in left and right ears was significant (P < 0.001). Mean and standard deviation of paired t test showed that hearing loss difference in left and right ears was significant in all frequencies except 1000 Hz (P < 0.001). Conclusion The findings of this research generally showed that 26.8% of the studied drivers have hearing loss. Hearing loss in the left ear was more than right ear.
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Affiliation(s)
- Siamak Pourabdian
- Department of Occupational Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Saeid Yazdanirad
- School of Health, Shahrekord University of Medical Sciences, Shahrekord, Iran.,Department of Occupational Health Engineering, School of Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Saeid Lotfi
- Department of Occupational Health Engineering, School of Health, Isfahan University of Medical Sciences, Isfahan, Iran.
| | - Parastoo Golshiri
- Department of Community Medicine and Family Physician, School of Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
| | - Behzad Mahaki
- Department of Biostatistics, School of Health, Kermanshah University of Medical Sciences, Kermanshah, Iran
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9
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Majumder P, Blacker TS, Nolan LS, Duchen MR, Gale JE. Multiphoton NAD(P)H FLIM reveals metabolic changes in individual cell types of the intact cochlea upon sensorineural hearing loss. Sci Rep 2019; 9:18907. [PMID: 31827194 PMCID: PMC6906381 DOI: 10.1038/s41598-019-55329-x] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/01/2019] [Accepted: 11/27/2019] [Indexed: 12/17/2022] Open
Abstract
An increasing volume of data suggests that changes in cellular metabolism have a major impact on the health of tissues and organs, including in the auditory system where metabolic alterations are implicated in both age-related and noise-induced hearing loss. However, the difficulty of access and the complex cyto-architecture of the organ of Corti has made interrogating the individual metabolic states of the diverse cell types present a major challenge. Multiphoton fluorescence lifetime imaging microscopy (FLIM) allows label-free measurements of the biochemical status of the intrinsically fluorescent metabolic cofactors NADH and NADPH with subcellular spatial resolution. However, the interpretation of NAD(P)H FLIM measurements in terms of the metabolic state of the sample are not completely understood. We have used this technique to explore changes in metabolism associated with hearing onset and with acquired (age-related and noise-induced) hearing loss. We show that these conditions are associated with altered NAD(P)H fluorescence lifetimes, use a simple cell model to confirm an inverse relationship between τbound and oxidative stress, and propose such changes as a potential index of oxidative stress applicable to all mammalian cell types.
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Affiliation(s)
- Paromita Majumder
- UCL Ear Institute, University College London, Grays Inn Road, London, WC1X 8EE, UK.
| | - Thomas S Blacker
- Research Department of Cell & Developmental Biology, University College London, Gower Street, London, WC1E 6BT, UK. .,Department of Physics & Astronomy, University College London, Gower Street, London, WC1E 6BT, UK. .,Centre for Mathematics and Physics in the Life Sciences and Experimental Biology, University College London, Gower Street, London, WC1E 6BT, UK.
| | - Lisa S Nolan
- UCL Ear Institute, University College London, Grays Inn Road, London, WC1X 8EE, UK
| | - Michael R Duchen
- Research Department of Cell & Developmental Biology, University College London, Gower Street, London, WC1E 6BT, UK
| | - Jonathan E Gale
- UCL Ear Institute, University College London, Grays Inn Road, London, WC1X 8EE, UK.,Research Department of Cell & Developmental Biology, University College London, Gower Street, London, WC1E 6BT, UK
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10
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Naert G, Pasdelou MP, Le Prell CG. Use of the guinea pig in studies on the development and prevention of acquired sensorineural hearing loss, with an emphasis on noise. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2019; 146:3743. [PMID: 31795705 PMCID: PMC7195866 DOI: 10.1121/1.5132711] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 07/30/2019] [Accepted: 08/12/2019] [Indexed: 05/10/2023]
Abstract
Guinea pigs have been used in diverse studies to better understand acquired hearing loss induced by noise and ototoxic drugs. The guinea pig has its best hearing at slightly higher frequencies relative to humans, but its hearing is more similar to humans than the rat or mouse. Like other rodents, it is more vulnerable to noise injury than the human or nonhuman primate models. There is a wealth of information on auditory function and vulnerability of the inner ear to diverse insults in the guinea pig. With respect to the assessment of potential otoprotective agents, guinea pigs are also docile animals that are relatively easy to dose via systemic injections or gavage. Of interest, the cochlea and the round window are easily accessible, notably for direct cochlear therapy, as in the chinchilla, making the guinea pig a most relevant and suitable model for hearing. This article reviews the use of the guinea pig in basic auditory research, provides detailed discussion of its use in studies on noise injury and other injuries leading to acquired sensorineural hearing loss, and lists some therapeutics assessed in these laboratory animal models to prevent acquired sensorineural hearing loss.
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Affiliation(s)
| | | | - Colleen G Le Prell
- School of Behavioral and Brain Sciences, University of Texas at Dallas, Dallas, Texas 75080, USA
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11
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Lin X, Li G, Zhang Y, Zhao J, Lu J, Gao Y, Liu H, Li GL, Yang T, Song L, Wu H. Hearing consequences in Gjb2 knock-in mice: implications for human p.V37I mutation. Aging (Albany NY) 2019; 11:7416-7441. [PMID: 31562289 PMCID: PMC6782001 DOI: 10.18632/aging.102246] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2019] [Accepted: 08/22/2019] [Indexed: 01/09/2023]
Abstract
Human p.V37I mutation of GJB2 gene was strongly correlated with late-onset progressive hearing loss, especially among East Asia populations. We generated a knock-in mouse model based on human p.V37I variant (c.109G>A) that recapitulated the human phenotype. Cochlear pathology revealed no significant hair cell loss, stria vascularis atrophy or spiral ganglion neuron loss, but a significant change in the length of gap junction plaques, which may have contributed to the observed mild endocochlear potential (EP) drop in homozygous mice lasting lifetime. The cochlear amplification in homozygous mice was compromised, but outer hair cells' function remained unchanged, indicating that the reduced amplification was EP- rather than prestin-generated. In addition to ABR threshold elevation, ABR wave I latencies were also prolonged in aged homozygous animals. We found in homozygous IHCs a significant increase in ICa but no change in Ca2+ efficiency in triggering exocytosis. Environmental insults such as noise exposure, middle ear injection of KCl solution and systemic application of furosemide all exacerbated the pathological phenotype in homozygous mice. We conclude that this Gjb2 mutation-induced hearing loss results from 1) reduced cochlear amplifier caused by lowered EP, 2) IHCs excitotoxicity associated with potassium accumulation around hair cells, and 3) progression induced by environmental insults.
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Affiliation(s)
- Xin Lin
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.,Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai 200125, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose diseases, Shanghai 200125, China
| | - Gen Li
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.,Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai 200125, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose diseases, Shanghai 200125, China
| | - Yu Zhang
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.,Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai 200125, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose diseases, Shanghai 200125, China
| | - Jingjing Zhao
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.,Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai 200125, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose diseases, Shanghai 200125, China
| | - Jiawen Lu
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.,Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai 200125, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose diseases, Shanghai 200125, China
| | - Yunge Gao
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.,Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai 200125, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose diseases, Shanghai 200125, China
| | - Huihui Liu
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.,Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai 200125, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose diseases, Shanghai 200125, China
| | - Geng-Lin Li
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.,Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai 200125, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose diseases, Shanghai 200125, China
| | - Tao Yang
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.,Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai 200125, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose diseases, Shanghai 200125, China
| | - Lei Song
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.,Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai 200125, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose diseases, Shanghai 200125, China
| | - Hao Wu
- Department of Otolaryngology-Head and Neck Surgery, Shanghai Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, China.,Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai 200125, China.,Shanghai Key Laboratory of Translational Medicine on Ear and Nose diseases, Shanghai 200125, China
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12
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Partearroyo T, Murillo-Cuesta S, Vallecillo N, Bermúdez-Muñoz JM, Rodríguez-de la Rosa L, Mandruzzato G, Celaya AM, Zeisel SH, Pajares MA, Varela-Moreiras G, Varela-Nieto I. Betaine-homocysteine S-methyltransferase deficiency causes increased susceptibility to noise-induced hearing loss associated with plasma hyperhomocysteinemia. FASEB J 2019; 33:5942-5956. [PMID: 30753104 PMCID: PMC6463923 DOI: 10.1096/fj.201801533r] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Betaine-homocysteine S-methyltransferases (BHMTs) are methionine cycle enzymes that remethylate homocysteine; hence, their malfunction leads to hyperhomocysteinemia. Epidemiologic and experimental studies have revealed a correlation between hyperhomocysteinemia and hearing loss. Here, we have studied the expression of methionine cycle genes in the mouse cochlea and the impact of knocking out the Bhmt gene in the auditory receptor. We evaluated age-related changes in mouse hearing by recording auditory brainstem responses before and following exposure to noise. Also, we measured cochlear cytoarchitecture, gene expression by RNA-arrays and quantitative RT-PCR, and metabolite levels in liver and plasma by HPLC. Our results indicate that there is an age-dependent strain-specific expression of methionine cycle genes in the mouse cochlea and a further regulation during the response to noise damage. Loss of Bhmt did not cause an evident impact in the hearing acuity of young mice, but it produced higher threshold shifts and poorer recovery following noise challenge. Hearing loss was associated with increased cochlear injury, outer hair cell loss, altered expression of cochlear methionine cycle genes, and hyperhomocysteinemia. Our results suggest that BHMT plays a central role in the homeostasis of cochlear methionine metabolism and that Bhmt2 up-regulation could carry out a compensatory role in cochlear protection against noise injury in the absence of BHMT.-Partearroyo, T., Murillo-Cuesta, S., Vallecillo, N., Bermúdez-Muñoz, J. M., Rodríguez-de la Rosa, L., Mandruzzato, G., Celaya, A. M., Zeisel, S. H., Pajares, M. A., Varela-Moreiras, G., Varela-Nieto, I. Betaine-homocysteine S-methyltransferase deficiency causes increased susceptibility to noise-induced hearing loss associated with plasma hyperhomocysteinemia.
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Affiliation(s)
- Teresa Partearroyo
- Departamento de Ciencias Farmacéuticas y de la Salud, Facultad de Farmacia, Universidad Centro de Estudios Universitarios CEU San Pablo, Madrid, Spain;,Instituto de Investigaciones Biomédicas Alberto Sols, Consejo Superior de Investigaciones Científicas–Universidad Autónoma de Madrid (CSIC-UAM), Madrid, Spain
| | - Silvia Murillo-Cuesta
- Instituto de Investigaciones Biomédicas Alberto Sols, Consejo Superior de Investigaciones Científicas–Universidad Autónoma de Madrid (CSIC-UAM), Madrid, Spain;,Centro de Investigación Biomédica en Red de Enfermedades Raras, (CIBERER), Instituto de Salud Carlos III, Madrid, Spain;,Instituto de Investigación Sanitaria La Paz (IdiPAZ), Madrid, Spain;,Correspondence: Instituto de Investigaciones Biomédicas Alberto Sols (CSIC-UAM), Arturo Duperier 4, 28029 Madrid, Spain. E-mail:
| | - Néstor Vallecillo
- Instituto de Investigaciones Biomédicas Alberto Sols, Consejo Superior de Investigaciones Científicas–Universidad Autónoma de Madrid (CSIC-UAM), Madrid, Spain
| | - Jose M. Bermúdez-Muñoz
- Instituto de Investigaciones Biomédicas Alberto Sols, Consejo Superior de Investigaciones Científicas–Universidad Autónoma de Madrid (CSIC-UAM), Madrid, Spain;,Centro de Investigación Biomédica en Red de Enfermedades Raras, (CIBERER), Instituto de Salud Carlos III, Madrid, Spain
| | - Lourdes Rodríguez-de la Rosa
- Instituto de Investigaciones Biomédicas Alberto Sols, Consejo Superior de Investigaciones Científicas–Universidad Autónoma de Madrid (CSIC-UAM), Madrid, Spain;,Centro de Investigación Biomédica en Red de Enfermedades Raras, (CIBERER), Instituto de Salud Carlos III, Madrid, Spain;,Instituto de Investigación Sanitaria La Paz (IdiPAZ), Madrid, Spain
| | | | - Adelaida M. Celaya
- Instituto de Investigaciones Biomédicas Alberto Sols, Consejo Superior de Investigaciones Científicas–Universidad Autónoma de Madrid (CSIC-UAM), Madrid, Spain;,Centro de Investigación Biomédica en Red de Enfermedades Raras, (CIBERER), Instituto de Salud Carlos III, Madrid, Spain
| | - Steven H. Zeisel
- Nutrition Research Institute, University of North Carolina at Chapel Hill, Kannapolis, North Carolina, USA; and
| | - María A. Pajares
- Instituto de Investigaciones Biomédicas Alberto Sols, Consejo Superior de Investigaciones Científicas–Universidad Autónoma de Madrid (CSIC-UAM), Madrid, Spain;,Instituto de Investigación Sanitaria La Paz (IdiPAZ), Madrid, Spain;,Centro de Investigaciones Biológicas, (CSIC) Madrid, Spain
| | - Gregorio Varela-Moreiras
- Departamento de Ciencias Farmacéuticas y de la Salud, Facultad de Farmacia, Universidad Centro de Estudios Universitarios CEU San Pablo, Madrid, Spain;,Instituto de Investigaciones Biomédicas Alberto Sols, Consejo Superior de Investigaciones Científicas–Universidad Autónoma de Madrid (CSIC-UAM), Madrid, Spain
| | - Isabel Varela-Nieto
- Instituto de Investigaciones Biomédicas Alberto Sols, Consejo Superior de Investigaciones Científicas–Universidad Autónoma de Madrid (CSIC-UAM), Madrid, Spain;,Centro de Investigación Biomédica en Red de Enfermedades Raras, (CIBERER), Instituto de Salud Carlos III, Madrid, Spain;,Instituto de Investigación Sanitaria La Paz (IdiPAZ), Madrid, Spain
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13
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Fujimoto C, Yamasoba T. Mitochondria-Targeted Antioxidants for Treatment of Hearing Loss: A Systematic Review. Antioxidants (Basel) 2019; 8:E109. [PMID: 31022870 PMCID: PMC6523236 DOI: 10.3390/antiox8040109] [Citation(s) in RCA: 53] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2019] [Revised: 04/22/2019] [Accepted: 04/23/2019] [Indexed: 01/22/2023] Open
Abstract
Mitochondrial dysfunction is associated with the etiologies of sensorineural hearing loss, such as age-related hearing loss, noise- and ototoxic drug-induced hearing loss, as well as hearing loss due to mitochondrial gene mutation. Mitochondria are the main sources of reactive oxygen species (ROS) and ROS-induced oxidative stress is involved in cochlear damage. Moreover, the release of ROS causes further damage to mitochondrial components. Antioxidants are thought to counteract the deleterious effects of ROS and thus, may be effective for the treatment of oxidative stress-related diseases. The administration of mitochondria-targeted antioxidants is one of the drug delivery systems targeted to mitochondria. Mitochondria-targeted antioxidants are expected to help in the prevention and/or treatment of diseases associated with mitochondrial dysfunction. Of the various mitochondria-targeted antioxidants, the protective effects of MitoQ and SkQR1 against ototoxicity have been previously evaluated in animal models and/or mouse auditory cell lines. MitoQ protects against both gentamicin- and cisplatin-induced ototoxicity. SkQR1 also provides auditory protective effects against gentamicin-induced ototoxicity. On the other hand, decreasing effect of MitoQ on gentamicin-induced cell apoptosis in auditory cell lines has been controversial. No clinical studies have been reported for otoprotection using mitochondrial-targeted antioxidants. High-quality clinical trials are required to reveal the therapeutic effect of mitochondria-targeted antioxidants in terms of otoprotection in patients.
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Affiliation(s)
- Chisato Fujimoto
- Department of Otolaryngology and Head and Neck Surgery, Graduate School of Medicine, The University of Tokyo 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.
- Department of Otolaryngology, Tokyo Teishin Hospital, 2-14-23, Fujimi, Chiyoda-ku, Tokyo 102-8798, Japan.
| | - Tatsuya Yamasoba
- Department of Otolaryngology and Head and Neck Surgery, Graduate School of Medicine, The University of Tokyo 7-3-1, Hongo, Bunkyo-ku, Tokyo 113-8655, Japan.
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14
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Urata S, Iida T, Yamamoto M, Mizushima Y, Fujimoto C, Matsumoto Y, Yamasoba T, Okabe S. Cellular cartography of the organ of Corti based on optical tissue clearing and machine learning. eLife 2019; 8:40946. [PMID: 30657453 PMCID: PMC6338463 DOI: 10.7554/elife.40946] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 01/05/2019] [Indexed: 12/20/2022] Open
Abstract
The highly organized spatial arrangement of sensory hair cells in the organ of Corti is essential for inner ear function. Here, we report a new analytical pipeline, based on optical clearing of tissue, for the construction of a single-cell resolution map of the organ of Corti. A sorbitol-based optical clearing method enabled imaging of the entire cochlea at subcellular resolution. High-fidelity detection and analysis of all hair cell positions along the entire longitudinal axis of the organ of Corti were performed automatically by machine learning–based pattern recognition. Application of this method to samples from young, adult, and noise-exposed mice extracted essential information regarding cellular pathology, including longitudinal and radial spatial characteristics of cell loss, implying that multiple mechanisms underlie clustered cell loss. Our method of cellular mapping is effective for system-level phenotyping of the organ of Corti under both physiological and pathological conditions.
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Affiliation(s)
- Shinji Urata
- Department of Cellular Neurobiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan.,Department of Otolaryngology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Tadatsune Iida
- Department of Cellular Neurobiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Masamichi Yamamoto
- Department of Nephrology, Graduate School of Medicine, Kyoto University, Kyoto, Japan
| | - Yu Mizushima
- Department of Otolaryngology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Chisato Fujimoto
- Department of Otolaryngology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Yu Matsumoto
- Department of Otolaryngology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Tatsuya Yamasoba
- Department of Otolaryngology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
| | - Shigeo Okabe
- Department of Cellular Neurobiology, Graduate School of Medicine, The University of Tokyo, Tokyo, Japan
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15
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Hammill TL, Campbell KC. Protection for medication-induced hearing loss: the state of the science. Int J Audiol 2018; 57:S67-S75. [PMID: 29688112 DOI: 10.1080/14992027.2018.1455114] [Citation(s) in RCA: 30] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
OBJECTIVE This review will summarise the current state of development of pharmaceutical interventions (prevention or treatment) for medication-induced ototoxicity. DESIGN Currently published literature was reviewed using PubMed and ClinicalTrials.gov to summarise the current state of the science. Details on the stage of development in the market pipeline are provided, along with evidence for clinical safety and efficacy reported. STUDY SAMPLE This review includes reports from 44 articles and clinical trial reports regarding agents in clinical or preclinical trials, having reached approved Investigational New Drug status with the Federal Drug Administration. RESULTS Vitamins and antioxidants are the most common agents currently evaluated for drug-induced ototoxicity intervention by targeting the oxidative stress pathway that leads to cochlear cell death and hearing loss. However, other strategies, including steroid treatment and reduction of ototoxic properties of the primary drugs, are discussed. CONCLUSIONS Retention of hearing during and after a life threatening illness is a major quality-of-life issue for patients receiving ototoxic drugs and their families. The agents discussed herein, while not mature enough at this point, offer great promise towards that goal. This review will provide a knowledge base for hearing providers to inquiries about such options from patients and interdisciplinary care teams alike.
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Affiliation(s)
- Tanisha L Hammill
- a Department of Defense Hearing , Center of Excellence , JBSA Lackland , TX , USA.,b Zcore Business Solutions, LLC , Round Rock , TX , USA
| | - Kathleen C Campbell
- c Department of Medical Microbiology, Immunology and Cell Biology, School of Medicine , Southern Illinois University , Springfield , IL , USA
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16
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Ding D, Jiang H, Chen GD, Longo-Guess C, Muthaiah VPK, Tian C, Sheppard A, Salvi R, Johnson KR. N-acetyl-cysteine prevents age-related hearing loss and the progressive loss of inner hair cells in γ-glutamyl transferase 1 deficient mice. Aging (Albany NY) 2017; 8:730-50. [PMID: 26977590 PMCID: PMC4925825 DOI: 10.18632/aging.100927] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2016] [Accepted: 02/18/2016] [Indexed: 02/07/2023]
Abstract
Genetic factors combined with oxidative stress are major determinants of age-related hearing loss (ARHL), one of the most prevalent disorders of the elderly. Dwarf grey mice, Ggt1dwg/dwg, are homozygous for a loss of function mutation of the γ-glutamyl transferase 1 gene, which encodes an important antioxidant enzyme critical for the resynthesis of glutathione (GSH). Since GSH reduces oxidative damage, we hypothesized that Ggt1dwg/dwg mice would be susceptible to ARHL. Surprisingly, otoacoustic emissions and cochlear microphonic potentials, which reflect cochlear outer hair cell (OHC) function, were largely unaffected in mutant mice, whereas auditory brainstem responses and the compound action potential were grossly abnormal. These functional deficits were associated with an unusual and selective loss of inner hair cells (IHC), but retention of OHC and auditory nerve fibers. Remarkably, hearing deficits and IHC loss were completely prevented by N-acetyl-L-cysteine, which induces de novo synthesis of GSH; however, hearing deficits and IHC loss reappeared when treatment was discontinued. Ggt1dwg/dwgmice represent an important new model for investigating ARHL, therapeutic interventions, and understanding the perceptual and electrophysiological consequences of sensory deprivation caused by the loss of sensory input exclusively from IHC.
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Affiliation(s)
- Dalian Ding
- Center for Hearing and Deafness, University at Buffalo, Buffalo, NY 14214, USA
| | - Haiyan Jiang
- Center for Hearing and Deafness, University at Buffalo, Buffalo, NY 14214, USA
| | - Guang-Di Chen
- Center for Hearing and Deafness, University at Buffalo, Buffalo, NY 14214, USA
| | | | | | - Cong Tian
- The Jackson Laboratory, Bar Harbor, ME 04609, USA
| | - Adam Sheppard
- Center for Hearing and Deafness, University at Buffalo, Buffalo, NY 14214, USA
| | - Richard Salvi
- Center for Hearing and Deafness, University at Buffalo, Buffalo, NY 14214, USA
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17
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Abstract
IMPORTANCE Excess free radical-induced oxidative stress and inflammatory processes are increasingly recognized as causative factors in hearing and balance disorders. Antioxidant micronutrients neutralize free radicals and, at adequate doses, reduce inflammation and demonstrate benefits in animal models and human trials. Therefore, it is reasonable to expect that biomarkers of oxidative damage and inflammation are appropriate correlative biological outcome parameters in clinical hearing intervention studies. OBJECTIVE To provide the otology investigator a selected panel of biomarkers from the large universe of available tests that can be used as reasonable secondary endpoints in hearing and balance research. BACKGROUND SETTING The tenets of antioxidant science dictate that there are a great variety of free radicals and that they impact different cellular targets. They also demonstrate varying functions in different cellular environments. In addition, oxidative stress and inflammation may cause direct injury to tissues, cell membrane lipids, proteins and mitochondrial, and nuclear DNA. To accommodate these many pathways, the useful categories of potential biomarkers become extensive. The degree of injury is also reflected by separate markers of inflammation and measures of antioxidant levels. Therefore, to provide a reliable indication of oxidative damage, inflammation and antioxidant level, it is necessary to determine a broad spectrum of lipid peroxidation markers, adducts of DNA, oxidation levels of proteins and pro-inflammatory cytokines. CONCLUSION This report highlights some of the most clinically relevant and well-studied biomarkers in each category of tissue damage. It also includes those markers with which the authors have had direct positive clinical experience. The outcome from these studies is intended to provide a list of adjunctive measures that can be recommended as a relevant biomarker panel in hearing disorder clinical trials.
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18
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Bodmer D. An update on drug design strategies to prevent acquired sensorineural hearing loss. Expert Opin Drug Discov 2017; 12:1161-1167. [PMID: 28838250 DOI: 10.1080/17460441.2017.1372744] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
INTRODUCTION Acute sensorineural hearing loss is a dramatic event for the patient. Different pathologies might result in acute sensorineural hearing loss, such as sudden hearing loss, exposure to medications/drugs or loud sound. Current therapeutic approaches include steroids and hyperbaric oxygen in addition to other methods. Research activities of the past have shed light on the molecular mechanisms involved in damage to hair cells, the synapses at the hair cell spiral ganglion junction and the stria vascularis. Molecular events and signaling pathways which underlie damage to these structures have been discovered. Areas covered: This paper summarizes current research efforts involved in investigating the molecular mechanisms involved in acute sensorineural hearing loss. Expert opinion: While progress has been made in unraveling basic mechanisms involved in acute sensorineural hearing loss, it is difficult to translate basic concepts to the clinic. There are often conflicting data in animal and human studies on the effect of a given intervention. There is also a lack of high quality clinical trials (double blind, placebo controlled and high powered). However, this author is confident that research efforts will pay out and that some of these efforts will translate into new therapeutic options for patients with acute hearing loss.
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Affiliation(s)
- Daniel Bodmer
- a Department of Biomedicine, Head and Neck Surgery , University of Basel Hospital , Basel , Switzerland.,b Department of Otolaryngology, Head and Neck Surgery , University of Basel Hospital , Basel , Switzerland
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19
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Noack V, Pak K, Jalota R, Kurabi A, Ryan AF. An Antioxidant Screen Identifies Candidates for Protection of Cochlear Hair Cells from Gentamicin Toxicity. Front Cell Neurosci 2017; 11:242. [PMID: 28867994 PMCID: PMC5563352 DOI: 10.3389/fncel.2017.00242] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Accepted: 07/31/2017] [Indexed: 12/24/2022] Open
Abstract
Reactive oxygen species are important elements in ototoxic damage to hair cells (HCs), appearing early in the damage process. Higher levels of natural antioxidants are positively correlated with resistance to ototoxins and many studies have shown that exogenous antioxidants can protect HCs from damage. While a very wide variety of antioxidants with different characteristics and intracellular targets exist, most ototoxicity studies have focused upon one or a few well-characterized compounds. Relatively little research has attempted to determine the comparative efficacy of large variety of different antioxidants. This has been in part due to the lack of translation between cell culture and in vivo measures of efficacy. To circumvent this limitation, we used an in vitro assay based on micro-explants from the basal and middle turns of the neonatal mouse organ of Corti to screen a commercial redox library of diverse antioxidant compounds for their ability to protect mammalian HCs from a high dose of the ototoxic antibiotic gentamicin. The library included several antioxidants that have previously been studied as potential treatments for HC damage, as well as many antioxidants that have never been applied to ototoxicity. The micro-explants were treated with 200 μM gentamicin alone, gentamicin plus one of three dosages of a redox compound, the highest dosage of compound alone, or were untreated. HC counts were determined before the gentamicin insult and at 1, 2, and 3 days afterward to evaluate the HC survival. From a total of 81 antioxidant compounds, 13 exhibited significant protection of HCs. These included members of a variety of antioxidant classes with several novel antioxidants, not previously tested on HCs, appearing to alleviate the damaging gentamicin effect. Some compounds previously shown to be protective of HCs were correspondingly protective in this in vitro screen, while others were not. Finally, one of the three pro-oxidant compounds included in the library as well as six antioxidants exhibited evidence of toxicity in the absence of gentamicin. The results demonstrate the wide variability in the ability of antioxidants to protect HCs from high-dose gentamicin damage, and identify promising candidate leads for further study as potential drug targets. HIGHLIGHTS • A medium-throughput assay based on micro-explants of the organ of Corti was developed to screen mammalian cochlear hair cells for protection from damage by ototoxins.• Eighty one antioxidants and 3 pro-oxidants were evaluated for hair cell protection from high-dose gentamicin.• Thirteen antioxidants were significantly protective, while 6 proved to be damaging.• The use of a common assay permitted an evaluation of the relative capacity of different antioxidants for the protection of hair cells.
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Affiliation(s)
- Volker Noack
- Department of Surgery and Otolaryngology, School of Medicine, University of California, San Diego, La JollaCA, United States
| | - Kwang Pak
- Department of Surgery and Otolaryngology, School of Medicine, University of California, San Diego, La JollaCA, United States.,VA San Diego Healthcare System, San DiegoCA, United States
| | - Rahul Jalota
- Department of Surgery and Otolaryngology, School of Medicine, University of California, San Diego, La JollaCA, United States
| | - Arwa Kurabi
- Department of Surgery and Otolaryngology, School of Medicine, University of California, San Diego, La JollaCA, United States
| | - Allen F Ryan
- Department of Surgery and Otolaryngology, School of Medicine, University of California, San Diego, La JollaCA, United States.,VA San Diego Healthcare System, San DiegoCA, United States
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20
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Noise-Induced Loss of Hair Cells and Cochlear Synaptopathy Are Mediated by the Activation of AMPK. J Neurosci 2017; 36:7497-510. [PMID: 27413159 DOI: 10.1523/jneurosci.0782-16.2016] [Citation(s) in RCA: 70] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2016] [Accepted: 05/31/2016] [Indexed: 12/21/2022] Open
Abstract
UNLABELLED Noise-induced hearing loss (NIHL) is a major unresolved public health problem. Here, we investigate pathomechanisms of sensory hair cell death and suggest a novel target for protective intervention. Cellular survival depends upon maintenance of energy homeostasis, largely by AMP-activated protein kinase (AMPK). In response to a noise exposure in CBA/J mice, the levels of phosphorylated AMPKα increased in hair cells in a noise intensity-dependent manner. Inhibition of AMPK via siRNA or the pharmacological inhibitor compound C attenuated noise-induced loss of outer hair cells (OHCs) and synaptic ribbons, and preserved auditory function. Additionally, noise exposure increased the activity of the upstream AMPK kinase liver kinase B1 (LKB1) in cochlear tissues. The inhibition of LKB1 by siRNA attenuated the noise-increased phosphorylation of AMPKα in OHCs, reduced the loss of inner hair cell synaptic ribbons and OHCs, and protected against NIHL. These results indicate that noise exposure induces hair cell death and synaptopathy by activating AMPK via LKB1-mediated pathways. Targeting these pathways may provide a novel route to prevent NIHL. SIGNIFICANCE STATEMENT Our results demonstrate for the first time that the activation of AMP-activated protein kinase (AMPK) α in sensory hair cells is noise intensity dependent and contributes to noise-induced hearing loss by mediating the loss of inner hair cell synaptic ribbons and outer hair cells. Noise induces the phosphorylation of AMPKα1 by liver kinase B1 (LKB1), triggered by changes in intracellular ATP levels. The inhibition of AMPK activation by silencing AMPK or LKB1, or with the pharmacological inhibitor compound C, reduced outer hair cell and synaptic ribbon loss as well as noise-induced hearing loss. This study provides new insights into mechanisms of noise-induced hearing loss and suggests novel interventions for the prevention of the loss of sensory hair cells and cochlear synaptopathy.
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21
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Han C, Kim MJ, Ding D, Park HJ, White K, Walker L, Gu T, Tanokura M, Yamasoba T, Linser P, Salvi R, Someya S. GSR is not essential for the maintenance of antioxidant defenses in mouse cochlea: Possible role of the thioredoxin system as a functional backup for GSR. PLoS One 2017; 12:e0180817. [PMID: 28686716 PMCID: PMC5501606 DOI: 10.1371/journal.pone.0180817] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2017] [Accepted: 06/21/2017] [Indexed: 11/18/2022] Open
Abstract
Glutathione reductase (GSR), a key member of the glutathione antioxidant defense system, converts oxidized glutathione (GSSG) to reduced glutathione (GSH) and maintains the intracellular glutathione redox state to protect the cells from oxidative damage. Previous reports have shown that Gsr deficiency results in defects in host defense against bacterial infection, while diquat induces renal injury in Gsr hypomorphic mice. In flies, overexpression of GSR extended lifespan under hyperoxia. In the current study, we investigated the roles of GSR in cochlear antioxidant defense using Gsr homozygous knockout mice that were backcrossed onto the CBA/CaJ mouse strain, a normal-hearing strain that does not carry a specific Cdh23 mutation that causes progressive hair cell degeneration and early onset of hearing loss. Gsr-/- mice displayed a significant decrease in GSR activity and GSH/GSSG ratios in the cytosol of the inner ears. However, Gsr deficiency did not affect ABR (auditory brainstem response) hearing thresholds, wave I amplitudes or wave I latencies in young mice. No histological abnormalities were observed in the cochlea of Gsr-/- mice. Furthermore, there were no differences in the activities of cytosolic glutathione-related enzymes, including glutathione peroxidase and glutamate-cysteine ligase, or the levels of oxidative damage markers in the inner ears between WT and Gsr-/- mice. In contrast, Gsr deficiency resulted in increased activities of cytosolic thioredoxin and thioredoxin reductase in the inner ears. Therefore, under normal physiological conditions, GSR is not essential for the maintenance of antioxidant defenses in mouse cochlea. Given that the thioredoxin system is known to reduce GSSG to GSH in multiple species, our findings suggest that the thioredoxin system can support GSSG reduction in the mouse peripheral auditory system.
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Affiliation(s)
- Chul Han
- Department of Aging and Geriatric Research, University of Florida, Gainesville, FL, United States of America
| | - Mi-Jung Kim
- Department of Aging and Geriatric Research, University of Florida, Gainesville, FL, United States of America
| | - Dalian Ding
- Center for Hearing and Deafness, State University of New York at Buffalo, NY, United States of America
| | - Hyo-Jin Park
- Department of Aging and Geriatric Research, University of Florida, Gainesville, FL, United States of America
- Whitney Laboratory, University of Florida, St Augustine, FL, United States of America
| | - Karessa White
- Department of Aging and Geriatric Research, University of Florida, Gainesville, FL, United States of America
| | - Logan Walker
- Department of Aging and Geriatric Research, University of Florida, Gainesville, FL, United States of America
| | - Tongjun Gu
- Bioinformatics, Interdisciplinary Center for Biotechnology Research, University of Florida, Gainesville, FL, United States of America
| | - Masaru Tanokura
- Department of Applied Biological Chemistry, University of Tokyo, Yayoi, Tokyo, Japan
| | - Tatsuya Yamasoba
- Department of Otolaryngology, University of Tokyo, Hongo, Tokyo, Japan
| | - Paul Linser
- Whitney Laboratory, University of Florida, St Augustine, FL, United States of America
| | - Richard Salvi
- Center for Hearing and Deafness, State University of New York at Buffalo, NY, United States of America
| | - Shinichi Someya
- Department of Aging and Geriatric Research, University of Florida, Gainesville, FL, United States of America
- * E-mail:
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Lin BM, Curhan SG, Wang M, Eavey R, Stankovic KM, Curhan GC. Duration of Analgesic Use and Risk of Hearing Loss in Women. Am J Epidemiol 2017; 185:40-47. [PMID: 27974293 DOI: 10.1093/aje/kww154] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2016] [Accepted: 10/05/2016] [Indexed: 12/14/2022] Open
Abstract
Aspirin, nonsteroidal antiinflammatory drugs (NSAID), and acetaminophen are commonly used. Frequent use of analgesics has been associated with a higher risk of hearing loss. However, the association between duration of analgesic use and the risk of hearing loss is unclear. We investigated the relationship between duration of analgesic use and self-reported hearing loss among 55,850 women in the Nurses' Health Study. Cox proportional hazards regression was used to adjust for potential confounders. During 873,376 person-years of follow-up (1990-2012), longer durations of NSAID use (for >6 years of use compared with <1 year, multivariable-adjusted relative risk = 1.10, 95% confidence interval: 1.06, 1.15; P for trend < 0.001) and acetaminophen use (for >6 years of use compared with <1 year, multivariable-adjusted relative risk = 1.09, 95% confidence interval: 1.04, 1.14; P for trend < 0.001) were associated with higher risks of hearing loss. Duration of aspirin use was not associated with hearing loss (for >6 years of use compared with <1 year, multivariable-adjusted relative risk = 1.01, 95% confidence interval: 0.97, 1.05; P for trend = 0.35). In this cohort of women, longer durations of NSAID and acetaminophen use were associated with slightly higher risks of hearing loss, but duration of aspirin use was not. Considering the high prevalence of analgesic use, this may be an important modifiable contributor to hearing loss.
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Sha SH, Schacht J. Emerging therapeutic interventions against noise-induced hearing loss. Expert Opin Investig Drugs 2016; 26:85-96. [PMID: 27918210 DOI: 10.1080/13543784.2017.1269171] [Citation(s) in RCA: 84] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
INTRODUCTION Noise-induced hearing loss (NIHL) due to industrial, military, and recreational noise exposure is a major, but also potentially preventable cause of acquired hearing loss. For the United States it is estimated that 26 million people (15% of the population) between the ages of 20 and 69 have a high-frequency NIHL at a detriment to the quality of life of the affected individuals and great economic cost to society. Areas covered: This review outlines the pathology and pathophysiology of hearing loss as seen in humans and animal models. Results from molecular studies are presented that have provided the basis for therapeutic strategies successfully applied to animals. Several compounds emerging from these studies (mostly antioxidants) are now being tested in field trials. Expert opinion: Although no clinically applicable intervention has been approved yet, recent trials are encouraging. In order to maximize protective therapies, future work needs to apply stringent criteria for noise exposure and outcome parameters. Attention needs to be paid not only to permanent NIHL due to death of sensory cells but also to temporary effects that may show delayed consequences. Existing results combined with the search for efficacious new therapies should establish a viable treatment within a decade.
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Affiliation(s)
- Su-Hua Sha
- a Department of Pathology and Laboratory Medicine , Medical University of South Carolina , Charleston , SC , USA
| | - Jochen Schacht
- b Kresge Hearing Research Institute , University of Michigan , Ann Arbor , MI , USA
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Pharmacological agents used for treatment and prevention in noise-induced hearing loss. Eur Arch Otorhinolaryngol 2016; 273:4089-4101. [DOI: 10.1007/s00405-016-3936-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Accepted: 02/10/2016] [Indexed: 12/20/2022]
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Kelly KM, Lalwani AK. On the Distant Horizon--Medical Therapy for Sensorineural Hearing Loss. Otolaryngol Clin North Am 2015; 48:1149-65. [PMID: 26409822 DOI: 10.1016/j.otc.2015.07.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Hearing loss is the most common sensory deficit in developed societies. Hearing impairment in children, particularly of prelingual onset, has been shown to negatively affect educational achievement, future employment and earnings, and even life expectancy. Sensorineural hearing loss (SNHL), which refers to defects within the cochlea or auditory nerve itself, far outweighs conductive causes for permanent hearing loss in both children and adults. The causes of SNHL in children are heterogeneous, including both congenital and acquired causes. This article identifies potential mechanisms of intervention both at the level of the hair cell and the spiral ganglion neurons.
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Affiliation(s)
- Kathleen M Kelly
- Department of Otolaryngology - Head and Neck Surgery, University of Texas Southwestern Medical Center, 5323 Harry Hinds Blvd, Dallas, TX 75390, USA
| | - Anil K Lalwani
- Department of Otolaryngology - Head and Neck Surgery, Columbia University Medical Center, Harkness Pavilion, 180 Fort Washington Avenue, Floor 7, New York, NY 10032, USA.
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Deheshi S, Dabiri B, Fan S, Tsang M, Rintoul GL. Changes in mitochondrial morphology induced by calcium or rotenone in primary astrocytes occur predominantly through ros-mediated remodeling. J Neurochem 2015; 133:684-99. [PMID: 25761412 DOI: 10.1111/jnc.13090] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2014] [Revised: 02/12/2015] [Accepted: 02/18/2015] [Indexed: 12/17/2022]
Abstract
Morphological changes in mitochondria have been primarily attributed to fission and fusion, while the more pliable transformations of mitochondria (remodeling, rounding, or stretching) have been largely overlooked. In this study, we quantify the contributions of fission and remodeling to changes in mitochondrial morphology induced by the Ca(2+) ionophore 4Br-A23187 and the metabolic toxin rotenone. We also examine the role of reactive oxygen species (ROS) in the regulation of mitochondrial remodeling. In agreement with our previous studies, mitochondrial remodeling, not fission, is the primary contributor to Ca(2+) -mediated changes in mitochondrial morphology induced by 4Br-A23187 in rat cortical astrocytes. Treatment with rotenone produced similar results. In both paradigms, remodeling was selectively blocked by antioxidants whereas fission was not, suggesting a ROS-mediated mechanism for mitochondrial remodeling. In support of this hypothesis, inhibition of endogenous ROS by overnight incubation in antioxidants resulted in elongated reticular networks of mitochondria. Examination of inner and outer mitochondrial membranes revealed that they largely acted in concert during the remodeling process. While mitochondrial morphology is traditionally ascribed to a net output of fission and fusion processes, in this study we provide evidence that the acute pliability of mitochondria can be a dominant factor in determining their morphology. More importantly, our results suggest that the remodeling process is independently regulated through a ROS-signaling mechanism. Mitochondrial morphology is traditionally ascribed to a balance of fission and fusion processes. We have shown that mitochondria can undergo more pliable transformations; remodeling, rounding, or stretching. We demonstrate that remodeling, not fission, is the primary contributor to calcium mediated changes in mitochondrial morphology in primary astrocytes. Others have shown fission is mediated by calcineurin. Our results suggest the remodeling process distinct from fission and is independently regulated through a ROS-signaling mechanism (CsA: Cyclosporine A; NAC: N-acetyl-l-cysteine; GSH: Reduced-L-Glutathione).
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Affiliation(s)
- Samineh Deheshi
- Department of Biological Sciences, Simon Fraser University, Burnaby, BC, Canada
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Bagger-Sjöbäck D, Strömbäck K, Hakizimana P, Plue J, Larsson C, Hultcrantz M, Papatziamos G, Smeds H, Danckwardt-Lillieström N, Hellström S, Johansson A, Tideholm B, Fridberger A. A randomised, double blind trial of N-Acetylcysteine for hearing protection during stapes surgery. PLoS One 2015; 10:e0115657. [PMID: 25763866 PMCID: PMC4357436 DOI: 10.1371/journal.pone.0115657] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2014] [Accepted: 09/24/2014] [Indexed: 12/01/2022] Open
Abstract
Background Otosclerosis is a disorder that impairs middle ear function, leading to conductive hearing loss. Surgical treatment results in large improvement of hearing at low sound frequencies, but high-frequency hearing often suffers. A likely reason for this is that inner ear sensory cells are damaged by surgical trauma and loud sounds generated during the operation. Animal studies have shown that antioxidants such as N-Acetylcysteine can protect the inner ear from noise, surgical trauma, and some ototoxic substances, but it is not known if this works in humans. This trial was performed to determine whether antioxidants improve surgical results at high frequencies. Methods We performed a randomized, double-blind and placebo-controlled parallel group clinical trial at three Swedish university clinics. Using block-stratified randomization, 156 adult patients undergoing stapedotomy were assigned to intravenous N-Acetylcysteine (150 mg/kg body weight) or matching placebo (1:1 ratio), starting one hour before surgery. The primary outcome was the hearing threshold at 6 and 8 kHz; secondary outcomes included the severity of tinnitus and vertigo. Findings One year after surgery, high-frequency hearing had improved 2.7 ± 3.8 dB in the placebo group (67 patients analysed) and 2.4 ± 3.7 dB in the treated group (72 patients; means ± 95% confidence interval, p = 0.54; linear mixed model). Surgery improved tinnitus, but there was no significant intergroup difference. Post-operative balance disturbance was common but improved during the first year, without significant difference between groups. Four patients receiving N-Acetylcysteine experienced mild side effects such as nausea and vomiting. Conclusions N-Acetylcysteine has no effect on hearing thresholds, tinnitus, or balance disturbance after stapedotomy. Trial Registration ClinicalTrials.gov NCT00525551
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Affiliation(s)
- Dan Bagger-Sjöbäck
- Center for Hearing and Communication Research, Department of Clinical Science, Intervention, and Technology, Karolinska Institutet, SE-171 77 Stockholm, Sweden
- Department of Otolaryngology, Karolinska University Hospital, SE-171 76 Stockholm, Sweden
| | - Karin Strömbäck
- Department of Otolaryngology, Academic Hospital, SE-751 85 Uppsala, Sweden
| | - Pierre Hakizimana
- Center for Hearing and Communication Research, Department of Clinical Science, Intervention, and Technology, Karolinska Institutet, SE-171 77 Stockholm, Sweden
- Department of Clinical and Experimental Medicine, Linköping University, SE-581 85 Linköping, Sweden
| | - Jan Plue
- Department of Physical Geography and Quaternary Geology, Stockholm University, SE-106 91 Stockholm, Sweden
| | - Christina Larsson
- Department of Otolaryngology, Karolinska University Hospital, SE-171 76 Stockholm, Sweden
| | - Malou Hultcrantz
- Center for Hearing and Communication Research, Department of Clinical Science, Intervention, and Technology, Karolinska Institutet, SE-171 77 Stockholm, Sweden
- Department of Otolaryngology, Karolinska University Hospital, SE-171 76 Stockholm, Sweden
| | - Georgios Papatziamos
- Department of Otolaryngology, Karolinska University Hospital, SE-171 76 Stockholm, Sweden
| | - Henrik Smeds
- Center for Hearing and Communication Research, Department of Clinical Science, Intervention, and Technology, Karolinska Institutet, SE-171 77 Stockholm, Sweden
- Department of Otolaryngology, Karolinska University Hospital, SE-171 76 Stockholm, Sweden
| | | | - Sten Hellström
- Center for Hearing and Communication Research, Department of Clinical Science, Intervention, and Technology, Karolinska Institutet, SE-171 77 Stockholm, Sweden
- Department of Audiology and Neurotology, Karolinska University Hospital, SE-171 76 Stockholm, Sweden
| | - Ann Johansson
- Department of Audiology and Neurotology, Karolinska University Hospital, SE-171 76 Stockholm, Sweden
| | - Bo Tideholm
- Department of Otolaryngology, Karolinska University Hospital, SE-171 76 Stockholm, Sweden
| | - Anders Fridberger
- Center for Hearing and Communication Research, Department of Clinical Science, Intervention, and Technology, Karolinska Institutet, SE-171 77 Stockholm, Sweden
- Department of Clinical and Experimental Medicine, Linköping University, SE-581 85 Linköping, Sweden
- * E-mail:
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Li YK, Rentmeester LA, Wang H. Antioxidants for idiopathic sudden sensorineural hearing loss. Hippokratia 2015. [DOI: 10.1002/14651858.cd010058.pub2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yi-Ke Li
- Vanderbilt University; Department of Otolaryngology; 1211 Medical Center Drive Nashville Tennessee USA 37232
| | | | - Hui Wang
- Key Laboratory of Otolaryngology Head & Neck Surgery, Capital Medical University; Department of Otolaryngology Head & Neck Surgery, Beijing Chaoyang Hospital; Beijing China
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Brown KD, Maqsood S, Huang JY, Pan Y, Harkcom W, Li W, Sauve A, Verdin E, Jaffrey SR. Activation of SIRT3 by the NAD⁺ precursor nicotinamide riboside protects from noise-induced hearing loss. Cell Metab 2014; 20:1059-68. [PMID: 25470550 PMCID: PMC4940130 DOI: 10.1016/j.cmet.2014.11.003] [Citation(s) in RCA: 214] [Impact Index Per Article: 21.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/21/2014] [Revised: 09/08/2014] [Accepted: 11/04/2014] [Indexed: 12/20/2022]
Abstract
Intense noise exposure causes hearing loss by inducing degeneration of spiral ganglia neurites that innervate cochlear hair cells. Nicotinamide adenine dinucleotide (NAD(+)) exhibits axon-protective effects in cultured neurons; however, its ability to block degeneration in vivo has been difficult to establish due to its poor cell permeability and serum instability. Here, we describe a strategy to increase cochlear NAD(+) levels in mice by administering nicotinamide riboside (NR), a recently described NAD(+) precursor. We find that administration of NR, even after noise exposure, prevents noise-induced hearing loss (NIHL) and spiral ganglia neurite degeneration. These effects are mediated by the NAD(+)-dependent mitochondrial sirtuin, SIRT3, since SIRT3-overexpressing mice are resistant to NIHL and SIRT3 deletion abrogates the protective effects of NR and expression of NAD(+) biosynthetic enzymes. These findings reveal that administration of NR activates a NAD(+)-SIRT3 pathway that reduces neurite degeneration caused by noise exposure.
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Affiliation(s)
- Kevin D Brown
- Department of Otolaryngology-Head and Neck Surgery, Weill Medical College, Cornell University, New York, NY 10065, USA.
| | - Sadia Maqsood
- Department of Otolaryngology-Head and Neck Surgery, Weill Medical College, Cornell University, New York, NY 10065, USA
| | - Jing-Yi Huang
- Gladstone Institutes, University of California, San Francisco, San Francisco, CA 94941, USA
| | - Yong Pan
- Gladstone Institutes, University of California, San Francisco, San Francisco, CA 94941, USA
| | - William Harkcom
- Department of Pharmacology, Weill Medical College, Cornell University, New York, NY 10065, USA
| | - Wei Li
- Department of Pharmacology, Weill Medical College, Cornell University, New York, NY 10065, USA
| | - Anthony Sauve
- Department of Pharmacology, Weill Medical College, Cornell University, New York, NY 10065, USA
| | - Eric Verdin
- Gladstone Institutes, University of California, San Francisco, San Francisco, CA 94941, USA.
| | - Samie R Jaffrey
- Department of Pharmacology, Weill Medical College, Cornell University, New York, NY 10065, USA.
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30
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Wilson T, Omelchenko I, Foster S, Zhang Y, Shi X, Nuttall AL. JAK2/STAT3 inhibition attenuates noise-induced hearing loss. PLoS One 2014; 9:e108276. [PMID: 25275304 PMCID: PMC4183445 DOI: 10.1371/journal.pone.0108276] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Accepted: 08/27/2014] [Indexed: 02/07/2023] Open
Abstract
Signal transducers and activators of transcription 3 (STAT3) is a stress responsive transcription factor that plays a key role in oxidative stress-mediated tissue injury. As reactive oxygen species (ROS) are a known source of damage to tissues of the inner ear following loud sound exposure, we examined the role of the Janus kinase 2 (JAK2)/STAT3 signaling pathway in noise induce hearing loss using the pathway specific inhibitor, JSI-124. Mice were exposed to a moderately damaging level of loud sound revealing the phosphorylation of STAT3 tyrosine 705 residues and nuclear localization in many cell types in the inner ear including the marginal cells of the stria vascularis, type II, III, and IV fibrocytes, spiral ganglion cells, and in the inner hair cells. Treatment of the mice with the JAK2/STAT3 inhibitor before noise exposure reduced levels of phosphorylated STAT3 Y705. We performed auditory brain stem response and distortion product otoacoustic emission measurements and found increased recovery of hearing sensitivity at two weeks after noise exposure with JAK2/STAT3 inhibition. Performance of cytocochleograms revealed improved outer hair cell survival in JSI-124 treated mice relative to control. Finally, JAK2/STAT3 inhibition reduced levels of ROS detected in outer hair cells at two hours post noise exposure. Together, these findings demonstrate that inhibiting the JAK2/STAT3 signaling pathway is protective against noise-induced cochlear tissue damage and loss of hearing sensitivity.
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MESH Headings
- Animals
- Cochlea/metabolism
- Cochlea/pathology
- Cochlea/physiopathology
- Epithelium/metabolism
- Evoked Potentials, Auditory, Brain Stem
- Gene Expression Regulation
- Hair Cells, Auditory/metabolism
- Hair Cells, Auditory/pathology
- Hearing Loss, Noise-Induced/metabolism
- Hearing Loss, Noise-Induced/pathology
- Hearing Loss, Noise-Induced/physiopathology
- Inflammation Mediators/metabolism
- Janus Kinase 2/antagonists & inhibitors
- Janus Kinase 2/metabolism
- Male
- Mice
- Otoacoustic Emissions, Spontaneous
- Phosphorylation
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Reactive Oxygen Species/metabolism
- STAT3 Transcription Factor/antagonists & inhibitors
- STAT3 Transcription Factor/metabolism
- Signal Transduction
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Affiliation(s)
- Teresa Wilson
- Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon, United States of America
| | - Irina Omelchenko
- Virginia Merrill Bloedel Hearing Research Center, University of Washington, Seattle, Washington, United States of America
| | - Sarah Foster
- Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon, United States of America
| | - Yuan Zhang
- Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon, United States of America
| | - Xiaorui Shi
- Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon, United States of America
| | - Alfred L. Nuttall
- Oregon Hearing Research Center, Oregon Health & Science University, Portland, Oregon, United States of America
- Kresge Hearing Research Institute, The University of Michigan, Ann Arbor, Michigan, United States of America
- * E-mail:
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Electroacoustic stimulation: now and into the future. BIOMED RESEARCH INTERNATIONAL 2014; 2014:350504. [PMID: 25276779 PMCID: PMC4168031 DOI: 10.1155/2014/350504] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/16/2014] [Accepted: 08/04/2014] [Indexed: 12/22/2022]
Abstract
Cochlear implants have provided hearing to hundreds of thousands of profoundly deaf people around the world. Recently, the eligibility criteria for cochlear implantation have been relaxed to include individuals who have some useful residual hearing. These recipients receive inputs from both electric and acoustic stimulation (EAS). Implant recipients who can combine these hearing modalities demonstrate pronounced benefit in speech perception, listening in background noise, and music appreciation over implant recipients that rely on electrical stimulation alone. The mechanisms bestowing this benefit are unknown, but it is likely that interaction of the electric and acoustic signals in the auditory pathway plays a role. Protection of residual hearing both during and following cochlear implantation is critical for EAS. A number of surgical refinements have been implemented to protect residual hearing, and the development of hearing-protective drug and gene therapies is promising for EAS recipients. This review outlines the current field of EAS, with a focus on interactions that are observed between these modalities in animal models. It also outlines current trends in EAS surgery and gives an overview of the drug and gene therapies that are clinically translatable and may one day provide protection of residual hearing for cochlear implant recipients.
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Lee JW, Shim BS, Chung JW. The effect of gingko biloba on hearing in mice with noise-induced temporary threshold shift. KOREAN JOURNAL OF AUDIOLOGY 2014; 17:74-7. [PMID: 24653910 PMCID: PMC3936537 DOI: 10.7874/kja.2013.17.2.74] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/13/2013] [Revised: 04/15/2013] [Accepted: 05/02/2013] [Indexed: 11/22/2022]
Abstract
Background and Objectives Gingko biloba extract is known for enhancing blood circulation, scavenging free radicals, and antagonizing against platelet-activating factor. This study evaluated the effect of Gingko biloba on the noise-induced temporary threshold shift of hearing. Materials and Methods Temporary threshold shift was induced by exposing mice to 110 dB SPL sound for 1 hour. The experimental group consisted of mice fed Gingko biloba [3 mg/kg, 6 mg/kg, and 12 mg/kg in 0.5% carboxymethyl cellulose (CMC)] for 7 days before noise exposure. CMC solution without Gingko biloba was fed to control mice. Hearing threshold was measured by auditory brainstem response (ABR) and distortion product otoacoustic emission (DPOAE). Results The hearing threshold increased after noise exposure and recovered to normal within 5 days in all groups. Compared to control mice (fed CMC solution only), mice fed Gingko biloba showed more rapid recovery of ABR threshold at 16 kHz in all three experimental groups. At the other frequencies, there was no significant change in hearing recovery in the Gingko biloba groups. There was no difference in DPOAE between groups. Conclusions Temporary threshold shift of hearing after noise exposure was partly affected by oral Gingko biloba.
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Affiliation(s)
- Ji-Won Lee
- Asan Institute For Life Science, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea. ; Department of Otorhinolaryngology-Head and Neck Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Byoung Soo Shim
- Department of Otorhinolaryngology-Head and Neck Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Jong Woo Chung
- Department of Otorhinolaryngology-Head and Neck Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
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Yamasoba T, Lin FR, Someya S, Kashio A, Sakamoto T, Kondo K. Current concepts in age-related hearing loss: epidemiology and mechanistic pathways. Hear Res 2013; 303:30-8. [PMID: 23422312 PMCID: PMC3723756 DOI: 10.1016/j.heares.2013.01.021] [Citation(s) in RCA: 359] [Impact Index Per Article: 32.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/18/2012] [Revised: 12/20/2012] [Accepted: 01/29/2013] [Indexed: 01/10/2023]
Abstract
Age-related hearing loss (AHL), also known as presbycusis, is a universal feature of mammalian aging and is characterized by a decline of auditory function, such as increased hearing thresholds and poor frequency resolution. The primary pathology of AHL includes the hair cells, stria vascularis, and afferent spiral ganglion neurons as well as the central auditory pathways. A growing body of evidence in animal studies has suggested that cumulative effect of oxidative stress could induce damage to macromolecules such as mitochondrial DNA (mtDNA) and that the resulting accumulation of mtDNA mutations/deletions and decline of mitochondrial function play an important role in inducing apoptosis of the cochlear cells, thereby the development of AHL. Epidemiological studies have demonstrated four categories of risk factors of AHL in humans: cochlear aging, environment such as noise exposure, genetic predisposition, and health co-morbidities such as cigarette smoking and atherosclerosis. Genetic investigation has identified several putative associating genes, including those related to antioxidant defense and atherosclerosis. Exposure to noise is known to induce excess generation of reactive oxygen species (ROS) in the cochlea, and cumulative oxidative stress can be enhanced by relatively hypoxic situations resulting from the impaired homeostasis of cochlear blood supply due to atherosclerosis, which could be accelerated by genetic and co-morbidity factors. Antioxidant defense system may also be influenced by genetic backgrounds. These may explain the large variations of the onset and extent of AHL among elderly subjects. This article is part of a Special Issue entitled "Annual Reviews 2013".
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Affiliation(s)
- Tatsuya Yamasoba
- Department of Otolaryngology and Head and Neck Surgery, University of Tokyo, Tokyo, Japan.
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Xiong M, Lai H, Yang C, Huang W, Wang J, Fu X, He Q. Comparison of the Protective Effects of Radix Astragali, α-Lipoic Acid, and Vitamin E on Acute Acoustic Trauma. CLINICAL MEDICINE INSIGHTS. EAR, NOSE AND THROAT 2012; 5:25-31. [PMID: 24179406 PMCID: PMC3791952 DOI: 10.4137/cment.s10711] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
Abstract
Objective Oxidative damage is a critical role which involves hearing loss induced by impulse noise. That exogenous antioxidant agents reduce noise induced hearing loss (NIHL) has been well demonstrated in both animal studies and clinical practices. Choosing a stronger and more effective antioxidant is very important for treatment of NIHL. Vitamin E, α-lipoic acid, and radix astragali are the most commonly used anti-oxidants for cochlear oxidative damage from acoustic trauma. In this study, the protective effects of radix astragali, α-lipoic acid, and vitamin E on acute acoustic trauma are investigated. Methods Guinea pigs in the experimental groups were intragastrically administered vitamin E, α-lipoic acid, and radix astragali. Auditory thresholds were assessed by sound-evoked auditory brainstem response (ABR) at click and tone bursts of 8, 16 and 32 kHz, 24 hours before and 72 hours after exposure to impulse noise. Cochlear malondialdehyde (MDA) concentrations were detected. Hair cell damage was analyzed by scanning electron microscopy. Results Vitamin E, α-lipoic acid, and radix astragali significantly reduced ABR deficits, reduced hair cell damage, and decreased the concentrations of MDA. α-lipoic acid and radix astragali were better than vitamin E, and there were no significant differences between α-lipoic acid and radix astragali. Conclusions α-lipoic acid or radix astragali are recommended for treatment of NIHL.
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Affiliation(s)
- Min Xiong
- Department of Otolaryngology, Guangzhou General Hospital of Guangzhou Military Command, Guangzhou, China
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Curhan SG, Shargorodsky J, Eavey R, Curhan GC. Analgesic use and the risk of hearing loss in women. Am J Epidemiol 2012; 176:544-54. [PMID: 22933387 DOI: 10.1093/aje/kws146] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
Use of analgesics is common and is associated with increased risk of hearing loss in men; however, the relation has not been examined prospectively in women. The authors prospectively examined the relation between frequency of aspirin, ibuprofen, and acetaminophen use and risk of hearing loss among 62,261 women aged 31-48 years at baseline (1995) in Nurses' Health Study II. The outcome was self-reported hearing loss (n = 10,012), and the follow-up period was 1995-2009. Cox proportional hazards regression was used to adjust for potential confounders. During 764,247 person-years of follow-up, ibuprofen use and acetaminophen use were independently associated with increased risk of hearing loss, but aspirin use was not. For ibuprofen, the multivariate-adjusted relative risk of hearing loss was 1.13 (95% confidence interval (CI): 1.06, 1.19) for use 2-3 days/week, 1.21 (95% CI: 1.11, 1.32) for use 4-5 days/week, and 1.24 (95% CI: 1.14, 1.35) for use ≥6 days/week (P-trend < 0.0001), compared with use less than once per week. For acetaminophen, the corresponding relative risks were 1.11 (95% CI: 1.02, 1.19), 1.21 (95% CI: 1.07, 1.37), and 1.08 (95% CI: 0.95, 1.22), respectively (P-trend = 0.0007). In this study, use of ibuprofen or acetaminophen (but not aspirin) 2 or more days per week was associated with an increased risk of hearing loss in women.
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Affiliation(s)
- Sharon G Curhan
- Channing Laboratory, Department of Medicine, Brigham and Women’s Hospital, Boston, Massachusetts 02115, USA.
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Steroid combination therapy and detoxification enzyme gene polymorphisms in sudden sensorineural hearing loss patients. Otol Neurotol 2011; 32:872-6. [PMID: 21389901 DOI: 10.1097/mao.0b013e31821341ac] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
OBJECTIVE The purpose of this study was to evaluate the relations among the combined therapy with steroid and the detoxification enzyme gene polymorphisms in patients with sudden sensorineural hearing loss (SSNHL). The pathogenetic mechanism of inner ear dysfunction could involve an increase in lipid peroxidation and a decrease in cellular antioxidant defense. Glutathione S-transferases (GSTs) and cytochrome P450 (CYP) belong to a system of detoxification and antioxidant enzymes that have been demonstrated in the inner ear. STUDY DESIGN A prospective study in patients with SSNHL. PATIENTS AND METHODS All 441 subjects were genotyped for GSTM1, GSTT1, and CYP1A1 polymorphisms. The polymorphisms were analyzed by polymerase chain reaction amplification, restriction enzyme digestion, and deoxyribonucleic acid fragment separation by electrophoresis. RESULTS No significant difference was observed between SSNHL patients and controls in 3 polymorphisms. However, the prevalence of the partial recovery group in patients with the CC genotype of CYP1A1 (22%) was higher than that in the complete recovery (7.4%) or no recovery group (12.5%) for the subjects classified according to modified Siegel's criteria but were not statistically significant. CONCLUSION This is the first approach to analyze gene polymorphism and efficacy of clinical treatment of patients with SSNHL, although the observations do not confirm the effect of the GSTM1/T1 and CYP1A1 genotypes as a risk factor for SSNHL.
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Mechanisms of aminoglycoside ototoxicity and targets of hair cell protection. Int J Otolaryngol 2011; 2011:937861. [PMID: 22121370 PMCID: PMC3202092 DOI: 10.1155/2011/937861] [Citation(s) in RCA: 267] [Impact Index Per Article: 20.5] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2011] [Accepted: 08/18/2011] [Indexed: 01/14/2023] Open
Abstract
Aminoglycosides are commonly prescribed antibiotics with deleterious side effects to the inner ear. Due to their popular application as a result of their potent antimicrobial activities, many efforts have been undertaken to prevent aminoglycoside ototoxicity. Over the years, understanding of the antimicrobial as well as ototoxic mechanisms of aminoglycosides has increased. These mechanisms are reviewed in regard to established and potential future targets of hair cell protection.
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Xiong M, He Q, Lai H, Huang W, Wang L, Yang C, Wang J. Radix Astragali injection enhances recovery from acute acoustic trauma. Acta Otolaryngol 2011; 131:1069-73. [PMID: 21631180 DOI: 10.3109/00016489.2011.591823] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
CONCLUSION The average recovery of hearing and cessation of tinnitus was significantly better after treatment with Radix Astragali (RA) than after non-treatment with RA. RA can be valuable adjuvant therapy for patients with acute acoustic trauma (AAT). OBJECTIVES AAT is one of the early indications for the use of RA. The reasons for administering RA to patients with AAT are based on experimental studies showing that noise exposure results in the formation of reactive oxygen species (ROS), which trigger metabolic damage to the organ of Corti. RA is a natural antioxidant. The aim of this study was to investigate the efficacy of RA in patients with AAT. METHODS We compared the recovery from hearing impairment and tinnitus in 40 ears treated with RA with 40 ears treated with non-RA. RA was given intravenously daily for 10 days. There were no significant differences in clinical or audiological data between RA and non-RA groups. RESULTS The average recovery of hearing at both high and speech frequencies was significantly better and tinnitus persisted less commonly in the RA group than in the non-RA group. Normal hearing at the end of the follow-up period was regained in 27 ears in the RA group and in 21 ears in the non-RA group (p < 0.01).
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Reduced formation of oxidative stress biomarkers and migration of mononuclear phagocytes in the cochleae of chinchilla after antioxidant treatment in acute acoustic trauma. Int J Otolaryngol 2011; 2011:612690. [PMID: 21961007 PMCID: PMC3179894 DOI: 10.1155/2011/612690] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2011] [Accepted: 07/19/2011] [Indexed: 02/01/2023] Open
Abstract
Objective. Inhibition of inflammation and free radical formation in the cochlea may be involved in antioxidant treatment in acute acoustic trauma. Procedure. Chinchilla were exposed to 105 dB sound pressure level octave band noise for 6 hours. One group of chinchilla was treated with antioxidants after noise exposure. Auditory brainstem responses, outer hair cell counts, and immunohistochemical analyses of biomarkers in the cochlea were conducted. Results. The antioxidant treatment significantly reduced hearing threshold shifts, outer hair cell loss, numbers of CD45+ cells, as well as 4-hydroxy-2-nonenal and nitrotyrosine formation in the cochlea. Conclusion. Antioxidant treatment may provide protection to sensory cells by inhibiting formation of reactive oxygen and nitrogen products and migration of mononuclear phagocytes in the cochlea. The present study provides further evidence of effectiveness of antioxidant treatment in reducing permanent hearing loss.
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Campbell K, Claussen A, Meech R, Verhulst S, Fox D, Hughes L. D-methionine (D-met) significantly rescues noise-induced hearing loss: timing studies. Hear Res 2011; 282:138-44. [PMID: 21924333 DOI: 10.1016/j.heares.2011.08.003] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2011] [Revised: 08/12/2011] [Accepted: 08/15/2011] [Indexed: 02/06/2023]
Abstract
We have previously reported rescue from noise-induced auditory brainstem response (ABR) threshold shifts with d-methionine (d-met) administration 1 h after noise exposure. The present study investigated further d-met rescue intervals at 3, 5 and 7 h post-noise exposure. Chinchillas laniger were exposed to a 6 h 105 dB sound pressure level (dB SPL) octave band noise (OBN) and then administered d-met i.p. starting 3, 5, or 7 h after noise exposure; controls received saline i.p. immediately after noise exposure. ABR assessments were performed at baseline and on post-exposure days 1 and 21. Outer hair cell (OHC) loss was measured in cochleae obtained at sacrifice 21 days post-exposure. Administration of d-met starting at any of the delay times of 3-7 h post-noise exposure significantly reduced day 21 ABR threshold shift at 2 and 4 kHz and OHC loss at all hair cell regions measured (2, 4, 6 and 8 kHz). ABR threshold shifts in the control group at 6 and 8 kHz were only 8 and 11 dB respectively allowing little opportunity to observe protection at those 2 frequencies.
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Affiliation(s)
- Kathleen Campbell
- Department of Surgery, Division of Otolaryngology, Southern Illinois University School of Medicine, PO Box 19629, Springfield, IL 62794-9629, USA.
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Poe DS, Pyykkö I. Nanotechnology and the treatment of inner ear diseases. WILEY INTERDISCIPLINARY REVIEWS-NANOMEDICINE AND NANOBIOTECHNOLOGY 2011; 3:212-221. [DOI: 10.1002/wnan.125] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Hoshino T, Tabuchi K, Hara A. Effects of NSAIDs on the Inner Ear: Possible Involvement in Cochlear Protection. Pharmaceuticals (Basel) 2010; 3:1286-1295. [PMID: 27713301 PMCID: PMC4033980 DOI: 10.3390/ph3051286] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2010] [Revised: 04/12/2010] [Accepted: 04/22/2010] [Indexed: 01/04/2023] Open
Abstract
Cyclooxygenase and lipoxygenase, two important enzymes involved in arachidonic acid metabolism, are major targets of non-steroidal anti-inflammatory drugs (NSAIDs). Recent investigations suggest that arachidonic cascades and their metabolites may be involved in maintaining inner ear functions. The excessive use of aspirin may cause tinnitus in humans and impairment of the outer hair cell functions in experimental animals. On the other hand, NSAIDs reportedly exhibit protective effects against various kinds of inner ear disorder. The present review summarizes the effects of NSAIDs on cochlear pathophysiology. NSAIDs are a useful ameliorative adjunct in the management of inner ear disorders.
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Affiliation(s)
- Tomofumi Hoshino
- Department of Otolaryngology, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8575, Japan.
| | - Keiji Tabuchi
- Department of Otolaryngology, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8575, Japan.
| | - Akira Hara
- Department of Otolaryngology, Graduate School of Comprehensive Human Sciences, University of Tsukuba, Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8575, Japan.
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Tanaka S, Tabuchi K, Hoshino T, Murashita H, Tsuji S, Hara A. Protective effects of exogenous GM-1 ganglioside on acoustic injury of the mouse cochlea. Neurosci Lett 2010; 473:237-41. [DOI: 10.1016/j.neulet.2010.02.057] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2010] [Revised: 02/16/2010] [Accepted: 02/22/2010] [Indexed: 10/19/2022]
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Curhan SG, Eavey R, Shargorodsky J, Curhan GC. Analgesic use and the risk of hearing loss in men. Am J Med 2010; 123:231-7. [PMID: 20193831 PMCID: PMC2831770 DOI: 10.1016/j.amjmed.2009.08.006] [Citation(s) in RCA: 54] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/02/2009] [Revised: 07/02/2009] [Accepted: 08/10/2009] [Indexed: 10/19/2022]
Abstract
BACKGROUND Hearing loss is a common sensory disorder, yet prospective data on potentially modifiable risk factors are limited. Regularly used analgesics, the most commonly used drugs in the US, may be ototoxic and contribute to hearing loss. METHODS We examined the independent association between self-reported professionally diagnosed hearing loss and regular use of aspirin, nonsteroidal anti-inflammatory drugs (NSAIDs), and acetaminophen in 26,917 men aged 40-74 years at baseline in 1986. Study participants completed detailed questionnaires at baseline and every 2 years thereafter. Incident cases of new-onset hearing loss were defined as those diagnosed after 1986. Cox proportional hazards multivariate regression was used to adjust for potential confounding factors. RESULTS During 369,079 person-years of follow-up, 3488 incident cases of hearing loss were reported. Regular use of each analgesic was independently associated with an increased risk of hearing loss. Multivariate-adjusted hazard ratios of hearing loss in regular users (2+ times/week) compared with men who used the specified analgesic <2 times/week were 1.12 (95% confidence interval [CI], 1.04-1.20) for aspirin, 1.21 (95% CI, 1.11-1.33) for NSAIDs, and 1.22 (95% CI, 1.07-1.39) for acetaminophen. For NSAIDs and acetaminophen, the risk increased with longer duration of regular use. The magnitude of the association was substantially higher in younger men. For men younger than age 50 years, the hazard ratio for hearing loss was 1.33 for regular aspirin use, 1.61 for NSAIDs, and 1.99 for acetaminophen. CONCLUSIONS Regular use of aspirin, NSAIDs, or acetaminophen increases the risk of hearing loss in men, and the impact is larger on younger individuals.
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Affiliation(s)
- Sharon G Curhan
- Department of Medicine, Brigham and Women's Hospital, Boston, MA 02115, USA.
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Tabuchi K, Oikawa K, Hoshino T, Nishimura B, Hayashi K, Yanagawa T, Warabi E, Ishii T, Tanaka S, Hara A. Cochlear protection from acoustic injury by inhibitors of p38 mitogen-activated protein kinase and sequestosome 1 stress protein. Neuroscience 2009; 166:665-70. [PMID: 20036720 DOI: 10.1016/j.neuroscience.2009.12.038] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2009] [Revised: 12/13/2009] [Accepted: 12/14/2009] [Indexed: 11/27/2022]
Abstract
This study evaluated the protective role of p38 mitogen-activated protein kinase (p38 MAPK) inhibitors and sequestosome 1 (Sqstm1/A170/p62), a stress-induced signal modulator, in acoustic injury of the cochlea in mice. Two weeks after the exposure of mice to acoustic stress, threshold shifts of the auditory brainstem response (ABR) from the pre-exposure level and hair cell loss were evaluated. The activation of p38 MAPK was observed in cochlea by immunostaining 4 h after acoustic stress. To examine the role of p38 MAPK in tissue injury, its inhibitors were i.p. injected into male wild-type C57BL mice before the acoustic overexposure. The inhibitors SB202190 and SB203580 but not the inactive analogue SB202474 dose-dependently decreased the auditory threshold shift and outer hair cell loss induced by acoustic overexposure, suggesting the involvement of p38 MAPK in ototoxicity. We found that acoustic overexposure induced the up-regulation of Sqstm1 mRNA expression in the cochlea of wild-type mice and that SQSTM1-deficient mice exhibited an enhanced ABR threshold shift and hair cell loss, suggesting a role of SQSTM1 in the protection of tissue from acoustic stress.
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Affiliation(s)
- K Tabuchi
- Department of Otolaryngology, Head and Neck Surgery, Graduate School of Comprehensive Human Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba 305-8575, Japan.
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Kopke RD. Pharmacological approaches to the prevention and treatment of cochlear injury due to noise. ACTA ACUST UNITED AC 2009. [DOI: 10.1080/16513860601181046] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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The Protective Effect of Orally Ingested Korean Red Ginseng on the Noise Induced Hearing Loss in Mice. J Ginseng Res 2009. [DOI: 10.5142/jgr.2009.33.2.104] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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Seidman MD, Tang W, Shirwany N, Bai U, Rubin CJ, Henig JP, Quirk WS. Anti-intercellular adhesion molecule-1 antibody's effect on noise damage. Laryngoscope 2009; 119:707-12. [DOI: 10.1002/lary.20109] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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