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Le TN, Straatman LV, Lea J, Westerberg B. Current insights in noise-induced hearing loss: a literature review of the underlying mechanism, pathophysiology, asymmetry, and management options. J Otolaryngol Head Neck Surg 2017; 46:41. [PMID: 28535812 PMCID: PMC5442866 DOI: 10.1186/s40463-017-0219-x] [Citation(s) in RCA: 194] [Impact Index Per Article: 27.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/12/2017] [Accepted: 05/15/2017] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Noise-induced hearing loss is one of the most common forms of sensorineural hearing loss, is a major health problem, is largely preventable and is probably more widespread than revealed by conventional pure tone threshold testing. Noise-induced damage to the cochlea is traditionally considered to be associated with symmetrical mild to moderate hearing loss with associated tinnitus; however, there is a significant number of patients with asymmetrical thresholds and, depending on the exposure, severe to profound hearing loss as well. MAIN BODY Recent epidemiology and animal studies have provided further insight into the pathophysiology, clinical findings, social and economic impacts of noise-induced hearing loss. Furthermore, it is recently shown that acoustic trauma is associated with vestibular dysfunction, with associated dizziness that is not always measurable with current techniques. Deliberation of the prevalence, treatment and prevention of noise-induced hearing loss is important and timely. Currently, prevention and protection are the first lines of defence, although promising protective effects are emerging from multiple different pharmaceutical agents, such as steroids, antioxidants and neurotrophins. CONCLUSION This review provides a comprehensive update on the pathophysiology, investigations, prevalence of asymmetry, associated symptoms, and current strategies on the prevention and treatment of noise-induced hearing loss.
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Affiliation(s)
- Trung N. Le
- Division of Otolaryngology - Head & Neck Surgery, Department of Surgery, University of British Columbia, Vancouver, BC Canada
| | - Louise V. Straatman
- Division of Otolaryngology - Head & Neck Surgery, Department of Surgery, University of British Columbia, Vancouver, BC Canada
| | - Jane Lea
- Division of Otolaryngology - Head & Neck Surgery, Department of Surgery, University of British Columbia, Vancouver, BC Canada
| | - Brian Westerberg
- Division of Otolaryngology - Head & Neck Surgery, Department of Surgery, University of British Columbia, Vancouver, BC Canada
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Calpain inhibitor alleviates permanent hearing loss induced by intense noise by preventing disruption of gap junction-mediated intercellular communication in the cochlear spiral ligament. Eur J Pharmacol 2017; 803:187-194. [DOI: 10.1016/j.ejphar.2017.03.058] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2016] [Revised: 02/27/2017] [Accepted: 03/29/2017] [Indexed: 01/11/2023]
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103
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Zhang J, Song YL, Tian KY, Qiu JH. Minocycline attenuates noise-induced hearing loss in rats. Neurosci Lett 2017; 639:31-35. [DOI: 10.1016/j.neulet.2016.12.039] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2016] [Revised: 12/15/2016] [Accepted: 12/16/2016] [Indexed: 11/29/2022]
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104
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Lisowska G, Jochem J, Gierlotka A, Misiołek M, Ścierski W. Sex-Related Cochlear Impairment in Cigarette Smokers. Med Sci Monit 2017; 23:377-397. [PMID: 28110343 PMCID: PMC5282963 DOI: 10.12659/msm.899589] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Background A number of studies have documented the influence of cigarette smoking on hearing. However, the association between sex and hearing impairment in smokers as measured by otoacoustic emissions (OAEs) has not been clearly established. The aim of this study was to analyze sex-specific effects of smoking on hearing via conventional and ultra-high-frequency pure tone audiometry (PTA), and OAEs, specifically spontaneous OAEs, click-evoked OAEs, and distortion-product OAEs. Material/Methods The study included 84 healthy volunteers aged 25–45 years (mean 34), among them 46 women (25 non-smokers and 21 smokers) and 38 men (16 non-smokers and 22 smokers). The protocol of the study included otoscopic examination, tympanometry, low-, moderate-, and ultra-high-frequency PTA, evaluation of spontaneous click-evoked (CEAOEs) and distortion-product otoacoustic emissions (DPOAEs), assessment of the DP-grams for 2f1-f2 (f1 from 977 to5 164 Hz), and input/output function at L2 primary tone level of 40–70 dB SPL. Results Smokers and non-smokers did not differ significantly in terms of their hearing thresholds assessed with tone audiometry. Male smokers presented with significantly lower levels of CEAOEs and DPOAEs than both male non-smokers and female smokers. Conclusions Smoking does not modulate a hearing threshold determined with PTA at low, moderate, and ultra-high frequencies, but causes a significant decrease in OAE levels. This effect was observed only in males, which implies that they are more susceptible to smoking-induced hearing impairment. Sex-specific differences in otoacoustic emissions level may reflect influences of genetic, hormonal, behavioral, and/or environmental factors.
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Affiliation(s)
- Grażyna Lisowska
- Department of Otorhinolaryngology and Laryngological Oncology in Zabrze, Medical University of Silesia, Katowice, Poland
| | - Jerzy Jochem
- Department of Basic Medical Sciences, Medical University of Silesia, Katowice, Poland
| | - Agata Gierlotka
- Department of Otorhinolaryngology and Laryngological Oncology in Zabrze, Medical University of Silesia, Katowice, Poland
| | - Maciej Misiołek
- Department of Otorhinolaryngology and Laryngological Oncology in Zabrze, Medical University of Silesia, Katowice, Poland
| | - Wojciech Ścierski
- Department of Otorhinolaryngology and Laryngological Oncology in Zabrze, Medical University of Silesia, Katowice, Poland
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Pharmacokinetic Properties of Adenosine Amine Congener in Cochlear Perilymph after Systemic Administration. BIOMED RESEARCH INTERNATIONAL 2017; 2017:8091462. [PMID: 28194422 PMCID: PMC5286489 DOI: 10.1155/2017/8091462] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Accepted: 11/27/2016] [Indexed: 11/25/2022]
Abstract
Noise-induced hearing loss (NIHL) is a global health problem affecting over 5% of the population worldwide. We have shown previously that acute noise-induced cochlear injury can be ameliorated by administration of drugs acting on adenosine receptors in the inner ear, and a selective A1 adenosine receptor agonist adenosine amine congener (ADAC) has emerged as a potentially effective treatment for cochlear injury and resulting hearing loss. This study investigated pharmacokinetic properties of ADAC in rat perilymph after systemic (intravenous) administration using a newly developed liquid chromatography-tandem mass spectrometry detection method. The method was developed and validated in accordance with the USA FDA guidelines including accuracy, precision, specificity, and linearity. Perilymph was sampled from the apical turn of the cochlea to prevent contamination with the cerebrospinal fluid. ADAC was detected in cochlear perilymph within two minutes following intravenous administration and remained in perilymph above its minimal effective concentration for at least two hours. The pharmacokinetic pattern of ADAC was significantly altered by exposure to noise, suggesting transient changes in permeability of the blood-labyrinth barrier and/or cochlear blood flow. This study supports ADAC development as a potential clinical otological treatment for acute sensorineural hearing loss caused by exposure to traumatic noise.
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106
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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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Kurabi A, Keithley EM, Housley GD, Ryan AF, Wong ACY. Cellular mechanisms of noise-induced hearing loss. Hear Res 2016; 349:129-137. [PMID: 27916698 PMCID: PMC6750278 DOI: 10.1016/j.heares.2016.11.013] [Citation(s) in RCA: 202] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Revised: 11/10/2016] [Accepted: 11/21/2016] [Indexed: 12/22/2022]
Abstract
Exposure to intense sound or noise can result in purely temporary threshold shift (TTS), or leave a residual permanent threshold shift (PTS) along with alterations in growth functions of auditory nerve output. Recent research has revealed a number of mechanisms that contribute to noise-induced hearing loss (NIHL). The principle cause of NIHL is damage to cochlear hair cells and associated synaptopathy. Contributions to TTS include reversible damage to hair cell (HC) stereocilia or synapses, while moderate TTS reflects protective purinergic hearing adaptation. PTS represents permanent damage to or loss of HCs and synapses. While the substrates of HC damage are complex, they include the accumulation of reactive oxygen species and the active stimulation of intracellular stress pathways, leading to programmed and/or necrotic cell death. Permanent damage to cochlear neurons can also contribute to the effects of NIHL, in addition to HC damage. These mechanisms have translational potential for pharmacological intervention and provide multiple opportunities to prevent HC damage or to rescue HCs and spiral ganglion neurons that have suffered injury. This paper reviews advances in our understanding of cellular mechanisms that contribute to NIHL and their potential for therapeutic manipulation.
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Affiliation(s)
- Arwa Kurabi
- Division of Otolaryngology, Department of Surgery, UCSD School of Medicine and San Diego VA Medical Center, La Jolla, CA, 92093, United States
| | - Elizabeth M Keithley
- Division of Otolaryngology, Department of Surgery, UCSD School of Medicine and San Diego VA Medical Center, La Jolla, CA, 92093, United States
| | - Gary D Housley
- Division of Otolaryngology, Department of Surgery, UCSD School of Medicine and San Diego VA Medical Center, La Jolla, CA, 92093, United States
| | - Allen F Ryan
- Division of Otolaryngology, Department of Surgery, UCSD School of Medicine and San Diego VA Medical Center, La Jolla, CA, 92093, United States.
| | - Ann C-Y Wong
- Division of Otolaryngology, Department of Surgery, UCSD School of Medicine and San Diego VA Medical Center, La Jolla, CA, 92093, United States
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Fetoni AR, Rolesi R, Paciello F, Eramo SLM, Grassi C, Troiani D, Paludetti G. Styrene enhances the noise induced oxidative stress in the cochlea and affects differently mechanosensory and supporting cells. Free Radic Biol Med 2016; 101:211-225. [PMID: 27769922 DOI: 10.1016/j.freeradbiomed.2016.10.014] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/08/2016] [Revised: 10/03/2016] [Accepted: 10/17/2016] [Indexed: 12/20/2022]
Abstract
Experimental and human investigations have raised the level of concern about the potential ototoxicity of organic solvents and their interaction with noise. The main objective of this study was to characterize the effects of the combined noise and styrene exposure on hearing focusing on the mechanism of damage on the sensorineural cells and supporting cells of the organ of Corti and neurons of the ganglion of Corti. The impact of single and combined exposures on hearing was evaluated by auditory functional testing and histological analyses of cochlear specimens. The mechanism of damage was studied by analyzing superoxide anion and lipid peroxidation expression and by computational analyses of immunofluorescence data to evaluate and compare the oxidative stress pattern in outer hair cells versus the supporting epithelial cells of the organ of Corti. The oxidative stress hypothesis was further analyzed by evaluating the protective effect of a Coenzyme Q10 analogue, the water soluble Qter, molecule known to have protective antioxidant properties against noise induced hearing loss and by the analysis of the expression of the endogenous defense enzymes. This study provides evidence of a reciprocal noise-styrene synergism based on a redox imbalance mechanism affecting, although with a different intensity of damage, the outer hair cell (OHC) sensory epithelium. Moreover, these two damaging agents address preferentially different cochlear targets: noise mainly the sensory epithelium, styrene the supporting epithelial cells. Namely, the increase pattern of lipid peroxidation in the organ of Corti matched the cell damage distribution, involving predominantly OHC layer in noise exposed cochleae and both OHC and Deiters' cell layers in the styrene or combined exposed cochleae. The antioxidant treatment reduced the lipid peroxidation increase, potentiated the endogenous antioxidant defense system at OHC level in both exposures but it failed to ameliorate the oxidative imbalance and cell death of Deiters' cells in the styrene and combined exposures. Current antioxidant therapeutic approaches to preventing sensory loss focus on hair cells alone. It remains to be seen whether targeting supporting cells, in addition to hair cells, might be an effective approach to protecting exposed subjects.
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MESH Headings
- Animals
- Antioxidants/pharmacology
- Hair Cells, Auditory, Inner/drug effects
- Hair Cells, Auditory, Inner/metabolism
- Hair Cells, Auditory, Inner/pathology
- Hair Cells, Auditory, Outer/drug effects
- Hair Cells, Auditory, Outer/metabolism
- Hair Cells, Auditory, Outer/pathology
- Hearing Loss, Noise-Induced/metabolism
- Hearing Loss, Noise-Induced/pathology
- Hearing Loss, Noise-Induced/physiopathology
- Hearing Loss, Noise-Induced/prevention & control
- Labyrinth Supporting Cells/drug effects
- Labyrinth Supporting Cells/metabolism
- Labyrinth Supporting Cells/pathology
- Lipid Peroxidation/drug effects
- Male
- Noise/adverse effects
- Oxidation-Reduction
- Oxidative Stress
- Rats
- Rats, Wistar
- Styrene/toxicity
- Ubiquinone/analogs & derivatives
- Ubiquinone/pharmacology
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Affiliation(s)
- A R Fetoni
- Institute of Otolaryngology, Università Cattolica School of Medicine, Rome, Italy; Institute of Cell Biology and Neurobiology, CNR, Monterotondo, Italy.
| | - R Rolesi
- Institute of Otolaryngology, Università Cattolica School of Medicine, Rome, Italy
| | - F Paciello
- Institute of Otolaryngology, Università Cattolica School of Medicine, Rome, Italy; Institute of Cell Biology and Neurobiology, CNR, Monterotondo, Italy
| | - S L M Eramo
- Institute of Human Physiology, Università Cattolica School of Medicine, Rome, Italy
| | - C Grassi
- Institute of Human Physiology, Università Cattolica School of Medicine, Rome, Italy
| | - D Troiani
- Institute of Human Physiology, Università Cattolica School of Medicine, Rome, Italy
| | - G Paludetti
- Institute of Otolaryngology, Università Cattolica School of Medicine, Rome, Italy
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110
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Takeda H, Kurioka T, Kaitsuka T, Tomizawa K, Matsunobu T, Hakim F, Mizutari K, Miwa T, Yamada T, Ise M, Shiotani A, Yumoto E, Minoda R. Protein transduction therapy into cochleae via the round window niche in guinea pigs. MOLECULAR THERAPY-METHODS & CLINICAL DEVELOPMENT 2016; 3:16055. [PMID: 27579336 PMCID: PMC4988354 DOI: 10.1038/mtm.2016.55] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 07/02/2016] [Accepted: 07/04/2016] [Indexed: 12/18/2022]
Abstract
Cell-penetrating peptides (CPPs) are short sequences of amino acids that facilitate the penetration of conjugated cargoes across mammalian cell membranes, and as such, they may provide a safe and effective method for drug delivery to the inner ear. Simple polyarginine peptides have been shown to induce significantly higher cell penetration rates among CPPs. Herein, we show that a peptide consisting of nine arginines ("9R") effectively delivered enhanced green fluorescent protein (EGFP) into guinea pig cochleae via the round window niche without causing any deterioration in auditory function. A second application, 24 hours after the first, prolonged the presence of EGFP. To assess the feasibility of protein transduction using 9R-CPPs via the round window, we used "X-linked inhibitor of apoptosis protein" (XIAP) bonded to a 9R peptide (XIAP-9R). XIAP-9R treatment prior to acoustic trauma significantly reduced putative hearing loss and the number of apoptotic hair cells loss in the cochleae. Thus, the topical application of molecules fused to 9R-CPPs may be a simple and promising strategy for treating inner ear diseases.
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Affiliation(s)
- Hiroki Takeda
- Department of Otolaryngology-Head and Neck Surgery, Kumamoto University , Kumamoto, Japan
| | - Takaomi Kurioka
- Department of Otolaryngology, National Defense Medical College , Tokorozawa, Japan
| | - Taku Kaitsuka
- Department of Molecular Physiology, Kumamoto University , Kumamoto, Japan
| | - Kazuhito Tomizawa
- Department of Molecular Physiology, Kumamoto University , Kumamoto, Japan
| | - Takeshi Matsunobu
- Department of Otolaryngology, National Defense Medical College , Tokorozawa, Japan
| | - Farzana Hakim
- Department of Molecular Physiology, Kumamoto University , Kumamoto, Japan
| | - Kunio Mizutari
- Department of Otolaryngology, National Defense Medical College , Tokorozawa, Japan
| | - Toru Miwa
- Department of Otolaryngology-Head and Neck Surgery, Kumamoto University , Kumamoto, Japan
| | - Takao Yamada
- Department of Otolaryngology-Head and Neck Surgery, Kumamoto University , Kumamoto, Japan
| | - Momoko Ise
- Department of Otolaryngology-Head and Neck Surgery, Kumamoto University , Kumamoto, Japan
| | - Akihiro Shiotani
- Department of Otolaryngology, National Defense Medical College , Tokorozawa, Japan
| | - Eiji Yumoto
- Department of Otolaryngology-Head and Neck Surgery, Kumamoto University , Kumamoto, Japan
| | - Ryosei Minoda
- Department of Otolaryngology-Head and Neck Surgery, Kumamoto University , Kumamoto, Japan
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Inhibition of cyclooxygenase-2 by NS398 attenuates noise-induced hearing loss in mice. Sci Rep 2016; 6:22573. [PMID: 26934825 PMCID: PMC4776277 DOI: 10.1038/srep22573] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Accepted: 02/18/2016] [Indexed: 12/20/2022] Open
Abstract
Noise-induced hearing loss (NIHL) is an important occupational disorder. However, the molecular mechanisms underlying NIHL have not been fully clarified; therefore, the condition lacks effective therapeutic methods. Cyclooxygenase-2 (Cox-2) is an inducible enzyme involved in the synthesis of prostaglandins, and has been implicated in many pathophysiological events, such as oxidative stress and inflammation. In this study, we investigated the possible role of Cox-2 in the mechanisms of NIHL and the therapeutic effect of the Cox-2 inhibitor NS398 on NIHL using a mouse model. We demonstrated that Cox-2 is constitutively expressed in the mouse cochlea, and its expression could be dramatically up-regulated by high levels of noise exposure. Furthermore, we demonstrated that pre-treatment with the Cox-2 inhibitor NS398 could inhibit Cox-2 expression during noise overstimulation; and could attenuate noise-induced hearing loss and hair cell damage. Our results suggest that Cox-2 is involved in the pathogenesis of NIHL; and pharmacological inhibition of Cox-2 has considerable therapeutic potential in NIHL.
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Eshraghi AA, Roell J, Shaikh N, Telischi FF, Bauer B, Guardiola M, Bas E, Van De Water T, Rivera I, Mittal J. A novel combination of drug therapy to protect residual hearing post cochlear implant surgery. Acta Otolaryngol 2016; 136:420-4. [PMID: 26854005 DOI: 10.3109/00016489.2015.1134809] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
UNLABELLED Conclusions A cocktail combining NAC, Mannitol, and Dexamethasone may be used to prevent loss of residual hearing post-implantation. There is a window of opportunity to treat the cochlea before the onset of cell death in HCs. Objective Inner ear trauma caused by cochlear implant electrode insertion trauma (EIT) initiates multiple molecular mechanisms in hair cells (HCs) or support cells (SCs), resulting in initiation of programmed cell death within the damaged tissues of the cochlea, which leads to loss of residual hearing. In earlier studies L-N-acetylcysteine (L-NAC), Mannitol, and dexamethasone have been shown independently to protect the HCs loss against different types of inner ear trauma. These three molecules have different otoprotective effects. The goal of this preliminary study is to test the efficacy of a combination of these molecules to enhance the otoprotection of HCs against EIT. Methods OC explants were dissected from P-3 rats and placed in serum-free media. Explants were divided into control and experimental groups. CONTROL GROUP (1) untreated controls; (2) EIT. Experimental group: (1) EIT + L-NAC (5, 2, or 1 mM); (2) EIT + Mannitol (100, 50, or 10 mM); (3) EIT + Dex (20, 10, or 5 μg/mL); (4) EIT + L-NAC + Mannitol + Dex. After EIT was caused in an in-vitro model of CI, explants were cultured in media containing L-NAC alone, Mannitol alone, or Dex alone at decreasing concentrations. Concentrations of L-NAC, Mannitol, and Dex that showed 50% protection of hair cell loss individually were used as a combination in experimental group 4. Results There was an increase of total hair cell (THC) loss in the EIT OC explants when compared with control group HC counts or the tri-therapy cochlea. This study defined the dosage of L-NAC, Mannitol, and Dex for the survival of 50% protection of hair cells in vitro. Their combination provided close to 96% protection, demonstrating an additive effect.
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Affiliation(s)
- Adrien A Eshraghi
- a Department of Otolaryngology , University of Miami Miller School of Medicine , Miami , FL , USA
| | - Jonathan Roell
- a Department of Otolaryngology , University of Miami Miller School of Medicine , Miami , FL , USA
| | - Noah Shaikh
- a Department of Otolaryngology , University of Miami Miller School of Medicine , Miami , FL , USA
| | - Fred F Telischi
- a Department of Otolaryngology , University of Miami Miller School of Medicine , Miami , FL , USA
| | - Blake Bauer
- a Department of Otolaryngology , University of Miami Miller School of Medicine , Miami , FL , USA
| | - Mateo Guardiola
- a Department of Otolaryngology , University of Miami Miller School of Medicine , Miami , FL , USA
| | - Esperanza Bas
- a Department of Otolaryngology , University of Miami Miller School of Medicine , Miami , FL , USA
| | - Thomas Van De Water
- a Department of Otolaryngology , University of Miami Miller School of Medicine , Miami , FL , USA
| | - Ileana Rivera
- a Department of Otolaryngology , University of Miami Miller School of Medicine , Miami , FL , USA
| | - Jeenu Mittal
- a Department of Otolaryngology , University of Miami Miller School of Medicine , Miami , FL , USA
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Xu YP, Shan XD, Liu YY, Pu Y, Wang CY, Tao QL, Deng Y, Cheng Y, Fan JP. Olfactory epithelium neural stem cell implantation restores noise-induced hearing loss in rats. Neurosci Lett 2016; 616:19-25. [PMID: 26777425 DOI: 10.1016/j.neulet.2016.01.016] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2015] [Revised: 01/11/2016] [Accepted: 01/12/2016] [Indexed: 12/15/2022]
Abstract
OBJECTIVE In this study, we aimed to elucidate the restorative effects of olfactory epithelium neural stem cells (oe-NSCs) implantation on noise-induced hearing loss and establish their mechanism of action. METHODS To model hearing loss, rats were subjected to consecutive seven-day noise exposure. Then, oe-NSCs were implanted into cochlear tissue by retroauricular approach. Auditory brainstem response (ABR) method was used to evaluate the hearing function. Immunohistochemical staining was utilized to determine cell survival and migration of oe-NSCs. After IL-1β stimulation, nerve growth factor (NGF), neurotrophin-3 (NT-3), and NT-4 levels were evaluated in oe-NSCs. The protective action of oe-NSCs against hydrogen peroxide-induced cell injury was detected by terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL). RESULTS oe-NSCs implantation into cochlear tissues ameliorated the noise-induced hearing impairment (p<0.05). After implantation, green fluorescent cells were observed in an even suspension in the lymph fluid of the cochlea, and 65% of the GFP(+) cells reached the cochlear duct wall three days after implantation, but did not expand to the Corti-organ. After IL-1β stimulation, olfactory epithelial stem cell increased their secretion of NGF and NT-3 (p<0.05), but not that of NT-4. TUNEL assay results revealed that oe-NSCs co-culturing with injured neurons reduced the apoptotic cell death induced by hydrogen peroxide. CONCLUSION After transplantation into the inner ear, oe-NSCs not only survived, but also migrated around the spiral ganglion neurons (SGNs) in Rosenthal's canal (RC). Hearing loss induced by noise exposure was restored after oe-NSCs implantation. Mechanically, oe-NSCs secreted NGF and NT-3, which likely contributed to the prevention of neuronal injury. This study provides novel data in support of the effective action of implanted oe-NSCs in the restoration of noise-induced hearing loss in a rat model.
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Affiliation(s)
- Ya-Ping Xu
- Department of Otolaryngology Head and Neck Surgery, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Xiao-Dong Shan
- Department of Otolaryngology Head and Neck Surgery, No. 463 Military Hospital, Shenyang, China
| | - Yue-Yang Liu
- Department of Otolaryngology Head and Neck Surgery, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Yu Pu
- Department of Otolaryngology Head and Neck Surgery, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Cheng-Yu Wang
- Department of Otolaryngology Head and Neck Surgery, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Qi-Lei Tao
- Department of Otolaryngology Head and Neck Surgery, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Yue Deng
- Department of Otolaryngology Head and Neck Surgery, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Yin Cheng
- Department of Otolaryngology Head and Neck Surgery, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, China
| | - Jing-Ping Fan
- Department of Otolaryngology Head and Neck Surgery, Shanghai Changzheng Hospital, Second Military Medical University, Shanghai, China.
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Choi SH, Choi CH. Noise-Induced Neural Degeneration and Therapeutic Effect of Antioxidant Drugs. J Audiol Otol 2015; 19:111-9. [PMID: 26771008 PMCID: PMC4704551 DOI: 10.7874/jao.2015.19.3.111] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Revised: 10/18/2015] [Accepted: 10/24/2015] [Indexed: 02/04/2023] Open
Abstract
The primary site of lesion induced by noise exposure is the hair cells in the organ of Corti and the primary neural degeneration occurs in synaptic terminals of cochlear nerve fibers and spiral ganglion cells. The cellular basis of noise-induced hearing loss is oxidative stress, which refers to a severe disruption in the balance between the production of free radicals and antioxidant defense system in the cochlea by excessive production of free radicals induced by noise exposure. Oxidative stress has been identified by a variety of biomarkers to label free radical activity which include four-hydroxy-2-nonenal, nitrotyrosine, and malondialdehyde, and inducible nitric oxide synthase, cytochrome-C, and cascade-3, 8, 9. Furthermore, oxidative stress is contributing to the necrotic and apoptotic cell deaths in the cochlea. To counteract the known mechanisms of pathogenesis and oxidative stress induced by noise exposure, a variety of antioxidant drugs including oxygen-based antioxidants such as N-acetyl-L-cystein and acetyl-L-carnitine and nitrone-based antioxidants such as phenyl-N-tert-butylnitrone (PBN), disufenton sodium, 4-hydroxy PBN, and 2, 4-disulfonyl PBN have been used in our laboratory. These antioxidant drugs were effective in preventing or treating noise-induced hearing loss. In combination with other antioxidants, antioxidant drugs showed a strong synergistic effect. Furthermore, successful use of antioxidant drugs depends on the optimal timing of treatment and the duration of treatment, which are highly related to the time window of free radical formation induced by noise exposure.
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Affiliation(s)
- Seong Hee Choi
- Department of Audiology & Speech Language Pathology, Research Institute of Biomimetic Sensory Control, and Catholic Hearing Voice Speech Center, Catholic University of Daegu, Gyeongsan, Korea
| | - Chul-Hee Choi
- Department of Audiology & Speech Language Pathology, Research Institute of Biomimetic Sensory Control, and Catholic Hearing Voice Speech Center, Catholic University of Daegu, Gyeongsan, Korea
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115
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Molina SJ, Miceli M, Guelman LR. Noise exposure and oxidative balance in auditory and extra-auditory structures in adult and developing animals. Pharmacological approaches aimed to minimize its effects. Pharmacol Res 2015; 109:86-91. [PMID: 26657417 DOI: 10.1016/j.phrs.2015.11.022] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/18/2015] [Revised: 11/23/2015] [Accepted: 11/25/2015] [Indexed: 10/22/2022]
Abstract
Noise coming from urban traffic, household appliances or discotheques might be as hazardous to the health of exposed people as occupational noise, because may likewise cause hearing loss, changes in hormonal, cardiovascular and immune systems and behavioral alterations. Besides, noise can affect sleep, work performance and productivity as well as communication skills. Moreover, exposure to noise can trigger an oxidative imbalance between reactive oxygen species (ROS) and the activity of antioxidant enzymes in different structures, which can contribute to tissue damage. In this review we systematized the information from reports concerning noise effects on cell oxidative balance in different tissues, focusing on auditory and non-auditory structures. We paid specific attention to in vivo studies, including results obtained in adult and developing subjects. Finally, we discussed the pharmacological strategies tested by different authors aimed to minimize the damaging effects of noise on living beings.
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Affiliation(s)
- S J Molina
- Cátedra de Farmacología, Facultad de Medicina, UBA and Centro de Estudios Farmacológicos y Botánicos, UBA-CEFYBO-CONICET, Buenos Aires, Argentina
| | - M Miceli
- Cátedra de Farmacología, Facultad de Medicina, UBA and Centro de Estudios Farmacológicos y Botánicos, UBA-CEFYBO-CONICET, Buenos Aires, Argentina
| | - L R Guelman
- Cátedra de Farmacología, Facultad de Medicina, UBA and Centro de Estudios Farmacológicos y Botánicos, UBA-CEFYBO-CONICET, Buenos Aires, Argentina.
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Melgar–Rojas P, Alvarado JC, Fuentes–Santamaría V, Gabaldón–Ull MC, Juiz JM. Validation of Reference Genes for RT-qPCR Analysis in Noise-Induced Hearing Loss: A Study in Wistar Rat. PLoS One 2015; 10:e0138027. [PMID: 26366995 PMCID: PMC4569353 DOI: 10.1371/journal.pone.0138027] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2015] [Accepted: 08/24/2015] [Indexed: 12/26/2022] Open
Abstract
The reverse transcriptase–quantitative polymerase chain reaction (RT–qPCR) requires adequate normalization in order to ensure accurate results. The use of reference genes is the most common method to normalize RT–qPCR assays; however, many studies have reported that the expression of frequently used reference genes is more variable than expected, depending on experimental conditions. Consequently, proper validation of the stability of reference genes is an essential step when performing new gene expression studies. Despite the fact that RT–qPCR has been widely used to elucidate molecular correlates of noise–induced hearing loss (NIHL), up to date there are no reports demonstrating validation of reference genes for the evaluation of changes in gene expression after NIHL. Therefore, in this study we evaluated the expression of some commonly used reference genes (Arbp, b–Act, b2m, CyA, Gapdh, Hprt1, Tbp, Tfrc and UbC) and examined their suitability as endogenous control genes for RT–qPCR analysis in the adult Wistar rat in response to NIHL. Four groups of rats were noise–exposed to generate permanent cochlear damage. Cochleae were collected at different time points after noise exposure and the expression level of candidate reference genes was evaluated by RT–qPCR using geNorm, NormFinder and BestKeeper software to determine expression stability. The three independent applications revealed Tbp as the most stably expressed reference gene. We also suggest a group of top–ranked reference genes that can be combined to obtain suitable reference gene pairs for the evaluation of the effects of noise on gene expression in the cochlea. These findings provide essential basis for further RT–qPCR analysis in studies of NIHL using Wistar rats as animal model.
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Affiliation(s)
- Pedro Melgar–Rojas
- Instituto de Investigación en Discapacidades Neurológicas (IDINE), School of Medicine, University of Castilla–La Mancha, Campus in Albacete, Albacete, Spain
- * E-mail:
| | - Juan Carlos Alvarado
- Instituto de Investigación en Discapacidades Neurológicas (IDINE), School of Medicine, University of Castilla–La Mancha, Campus in Albacete, Albacete, Spain
| | - Verónica Fuentes–Santamaría
- Instituto de Investigación en Discapacidades Neurológicas (IDINE), School of Medicine, University of Castilla–La Mancha, Campus in Albacete, Albacete, Spain
| | - María Cruz Gabaldón–Ull
- Instituto de Investigación en Discapacidades Neurológicas (IDINE), School of Medicine, University of Castilla–La Mancha, Campus in Albacete, Albacete, Spain
| | - José M. Juiz
- Instituto de Investigación en Discapacidades Neurológicas (IDINE), School of Medicine, University of Castilla–La Mancha, Campus in Albacete, Albacete, Spain
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Fujita T, Yamashita D, Irino Y, Kitamoto J, Fukuda Y, Inokuchi G, Hasegawa S, Otsuki N, Yoshida M, Nibu KI. Metabolomic profiling in inner ear fluid by gas chromatography/mass spectrometry in guinea pig cochlea. Neurosci Lett 2015; 606:188-93. [PMID: 26343935 DOI: 10.1016/j.neulet.2015.09.001] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2015] [Revised: 08/12/2015] [Accepted: 09/01/2015] [Indexed: 01/10/2023]
Abstract
The composition and homeostasis of inner ear fluids are important in hearing function. The purpose of this study was to perform metabolomic analysis of the inner ear fluid in guinea pig cochlea, which has not been previously reported in literature, using gas chromatography/mass spectrometry (GC/MS). Seventy-seven kinds of metabolites were detected in the inner ear fluid. Six metabolites, ascorbic acid, fructose, galactosamine, inositol, pyruvate+oxaloacetic acid, and meso-erythritol, were significantly more abundant, and nine metabolites, phosphate, valine, glycine, glycerol, ornithine, glucose, citric acid+isocitric acid, mannose, and trans-4-hydroxy-L-proline, were less abundant in the inner ear fluid than in plasma. The levels of ten metabolites, 3-hydroxy-butyrate, glycerol, fumaric acid, galactosamine, pyruvate+oxaloacetic acid, phosphate, meso-erythritol, citric acid+isocitric acid, mannose, and inositol, in the inner ear fluid significantly changed after loud noise exposure. These observations may help to elucidate various clinical conditions of sensorineural hearing loss, including noise-induced hearing loss.
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Affiliation(s)
- Takeshi Fujita
- Department of Otolaryngology-Head and Neck Surgery, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan
| | - Daisuke Yamashita
- Department of Otolaryngology-Head and Neck Surgery, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan.
| | - Yasuhiro Irino
- The Integrated Center for Mass Spectrometry, Graduate School of Medicine, Kobe University, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan
| | - Junko Kitamoto
- Department of Otolaryngology-Head and Neck Surgery, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan
| | - Yuriko Fukuda
- Department of Otolaryngology-Head and Neck Surgery, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan
| | - Go Inokuchi
- Department of Otolaryngology-Head and Neck Surgery, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan
| | - Shingo Hasegawa
- Department of Otolaryngology-Head and Neck Surgery, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan
| | - Naoki Otsuki
- Department of Otolaryngology-Head and Neck Surgery, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan
| | - Masaru Yoshida
- The Integrated Center for Mass Spectrometry, Graduate School of Medicine, Kobe University, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan; Division of Metabolomics Research, Graduate School of Medicine, Kobe University, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan
| | - Ken-ichi Nibu
- Department of Otolaryngology-Head and Neck Surgery, Kobe University Graduate School of Medicine, 7-5-1 Kusunoki-cho, Chuo-ku, Kobe, Hyogo 650-0017, Japan
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Vetter DE. Cellular signaling protective against noise-induced hearing loss – A role for novel intrinsic cochlear signaling involving corticotropin-releasing factor? Biochem Pharmacol 2015; 97:1-15. [PMID: 26074267 DOI: 10.1016/j.bcp.2015.06.011] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Accepted: 06/08/2015] [Indexed: 12/11/2022]
Abstract
Hearing loss afflicts approximately 15% of the world's population, and crosses all socioeconomic boundaries. While great strides have been made in understanding the genetic components of syndromic and non-syndromic hearing loss, understanding of the mechanisms underlying noise-induced hearing loss (NIHL) have come much more slowly. NIHL is not simply a mechanism by which older individuals loose their hearing. Significantly, the incidence of NIHL is increasing, and is now involving ever younger populations. This may predict future increased occurrences of hearing loss. Current research has shown that even short-term exposures to loud sounds generating what was previously considered temporary hearing loss, actually produces an almost immediate and permanent loss of specific populations of auditory nerve fibers. Additionally, recurrent exposures to intense sound may hasten age-related hearing loss. While NIHL is a significant medical concern, to date, few compounds have delivered significant protection, arguing that new targets need to be identified. In this commentary, we will explore cellular signaling processes taking place in the cochlea believed to be involved in protection against hearing loss, and highlight new data suggestive of novel signaling not previously recognized as occurring in the cochlea, that is perhaps protective of hearing. This includes a recently described local hypothalamic-pituitary-adrenal axis (HPA)-like signaling system fully contained in the cochlea. This system may represent a local cellular stress-response system based on stress hormone release similar to the systemic HPA axis. Its discovery may hold hope for new drug therapies that can be delivered directly to the cochlea, circumventing systemic side effects.
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Affiliation(s)
- Douglas E Vetter
- University of Mississippi Medical Center, Department of Neurobiology and Anatomical Sciences, 2500 N. State St., Jackson, MS 39216, USA.
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Yuan H, Wang X, Hill K, Chen J, Lemasters J, Yang SM, Sha SH. Autophagy attenuates noise-induced hearing loss by reducing oxidative stress. Antioxid Redox Signal 2015; 22:1308-24. [PMID: 25694169 PMCID: PMC4410759 DOI: 10.1089/ars.2014.6004] [Citation(s) in RCA: 116] [Impact Index Per Article: 12.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
AIMS Reactive oxygen species play a dual role in mediating both cell stress and defense pathways. Here, we used pharmacological manipulations and siRNA silencing to investigate the relationship between autophagy and oxidative stress under conditions of noise-induced temporary, permanent, and severe permanent auditory threshold shifts (temporary threshold shift [TTS], permanent threshold shift [PTS], and severe PTS [sPTS], respectively) in adult CBA/J mice. RESULTS Levels of oxidative stress markers (4-hydroxynonenal [4-HNE] and 3-nitrotyrosine [3-NT]) increased in outer hair cells (OHCs) in a noise-dose-dependent manner, whereas levels of the autophagy marker microtubule-associated protein light chain 3 B (LC3B) were sharply elevated after TTS but rose only slightly in response to PTS and were unaltered by sPTS noise. Furthermore, green fluorescent protein (GFP) intensity increased in GFP-LC3 mice after TTS-noise exposure. Treatment with rapamycin, an autophagy activator, significantly increased LC3B expression, while diminishing 4-HNE and 3-NT levels, reducing noise-induced hair cell loss, and, subsequently, noise-induced hearing loss (NIHL). In contrast, treatment with either the autophagy inhibitor 3-methyladenine (3MA) or LC3B siRNA reduced LC3B expression, increased 3-NT and 4-HNE levels, and exacerbated TTS to PTS. INNOVATION This study demonstrates a relationship between oxidative stress and autophagy in OHCs and reveals that autophagy is an intrinsic cellular process that protects against NIHL by attenuating oxidative stress. CONCLUSIONS The results suggest that the lower levels of oxidative stress incurred by TTS-noise exposure induce autophagy, which promotes OHC survival. However, excessive oxidative stress under sPTS-noise conditions overwhelms the beneficial potential of autophagy in OHCs and leads to OHC death and NIHL.
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Affiliation(s)
- Hu Yuan
- 1 Department of Pathology and Laboratory Medicine, Medical University of South Carolina , Charleston, South Carolina
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Wong ACY, Ryan AF. Mechanisms of sensorineural cell damage, death and survival in the cochlea. Front Aging Neurosci 2015; 7:58. [PMID: 25954196 PMCID: PMC4404918 DOI: 10.3389/fnagi.2015.00058] [Citation(s) in RCA: 172] [Impact Index Per Article: 19.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2015] [Accepted: 04/05/2015] [Indexed: 12/20/2022] Open
Abstract
The majority of acquired hearing loss, including presbycusis, is caused by irreversible damage to the sensorineural tissues of the cochlea. This article reviews the intracellular mechanisms that contribute to sensorineural damage in the cochlea, as well as the survival signaling pathways that can provide endogenous protection and tissue rescue. These data have primarily been generated in hearing loss not directly related to age. However, there is evidence that similar mechanisms operate in presbycusis. Moreover, accumulation of damage from other causes can contribute to age-related hearing loss (ARHL). Potential therapeutic interventions to balance opposing but interconnected cell damage and survival pathways, such as antioxidants, anti-apoptotics, and pro-inflammatory cytokine inhibitors, are also discussed.
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Affiliation(s)
- Ann C Y Wong
- Department of Surgery/Division of Otolaryngology, University of California, San Diego School of Medicine La Jolla, CA, USA ; Department of Physiology and Translational Neuroscience Facility, School of Medical Sciences, University of New South Wales Sydney, NSW, Australia
| | - Allen F Ryan
- Department of Surgery/Division of Otolaryngology, University of California, San Diego School of Medicine La Jolla, CA, USA ; Veterans Administration Medical Center La Jolla, CA, USA ; Department of Neurosciences, University of California, San Diego School of Medicine La Jolla, CA, USA
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Eshraghi AA, Lang DM, Roell J, Van De Water TR, Garnham C, Rodrigues H, Guardiola M, Gupta C, Mittal J. Mechanisms of programmed cell death signaling in hair cells and support cells post-electrode insertion trauma. Acta Otolaryngol 2015; 135:328-34. [PMID: 25761716 DOI: 10.3109/00016489.2015.1012276] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
CONCLUSION Programmed cell death (PCD) initially starts in the support cells (SCs) after electrode insertion trauma (EIT), followed by PCD in hair cells (HCs). Activation of caspase-3 was observed only in SCs. Protecting both SCs and HCs with selective otoprotective drugs at an early stage post implantation may help to preserve residual hearing. OBJECTIVES Cochlear implant EIT can initiate sensory cell losses via necrosis and PCD within the organ of Corti, which can lead to a loss of residual hearing. PCD appears to be a major factor in HC loss post-EIT. The current study aimed to: (1) determine the onset of PCD in both SCs and HCs within the traumatized organ of Corti; and (2) identify the molecular mechanisms active within the HCs and SCs that are undergoing PCD. METHODS Adult guinea pigs were assigned to one of two groups: (1) EIT and (2) unoperated contralateral ears as controls. Immunostaining of dissected organ of Corti surface preparations for phosphorylated-Jun, cleaved caspase-3, and 4-hydroxy-2,3-nonenal (HNE) were performed at 6, 12, and 24 h post-EIT and for contralateral control ears. RESULTS At 6 h post-EIT the SCs immunolabeled for the presence of phosphorylated-Jun and activated caspase-3. Phosphorylated p-Jun labeling was observed at 12 h in both the HCs and SCs of middle and basal cochlear turns. Cleaved caspase-3 was not observed in HCs of any cochlear turn at up to 24 h post-EIT. Lipid peroxidation (HNE immunostaining) was first observed at 12 h post-EIT in both the HCs and SCs of the basal turn, and reached the apical turn by 24 h post-EIT.
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122
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Dinh CT, Goncalves S, Bas E, Van De Water TR, Zine A. Molecular regulation of auditory hair cell death and approaches to protect sensory receptor cells and/or stimulate repair following acoustic trauma. Front Cell Neurosci 2015; 9:96. [PMID: 25873860 PMCID: PMC4379916 DOI: 10.3389/fncel.2015.00096] [Citation(s) in RCA: 62] [Impact Index Per Article: 6.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2014] [Accepted: 03/03/2015] [Indexed: 12/20/2022] Open
Abstract
Loss of auditory sensory hair cells (HCs) is the most common cause of hearing loss. This review addresses the signaling pathways that are involved in the programmed and necrotic cell death of auditory HCs that occur in response to ototoxic and traumatic stressor events. The roles of inflammatory processes, oxidative stress, mitochondrial damage, cell death receptors, members of the mitogen-activated protein kinase (MAPK) signal pathway and pro- and anti-cell death members of the Bcl-2 family are explored. The molecular interaction of these signal pathways that initiates the loss of auditory HCs following acoustic trauma is covered and possible therapeutic interventions that may protect these sensory HCs from loss via apoptotic or non-apoptotic cell death are explored.
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Affiliation(s)
- Christine T Dinh
- University of Miami Ear Institute, University of Miami Miller School of Medicine Miami, FL, USA
| | - Stefania Goncalves
- University of Miami Ear Institute, University of Miami Miller School of Medicine Miami, FL, USA
| | - Esperanza Bas
- University of Miami Ear Institute, University of Miami Miller School of Medicine Miami, FL, USA
| | - Thomas R Van De Water
- University of Miami Ear Institute, University of Miami Miller School of Medicine Miami, FL, USA
| | - Azel Zine
- Integrative and Adaptive Neurosciences, Aix-Marseille Université, CNRS, UMR 7260 Marseille, France ; Faculty of Pharmacy, Biophysics Department, University of Montpellier Montpellier, France
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123
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Reactive oxygen species, apoptosis, and mitochondrial dysfunction in hearing loss. BIOMED RESEARCH INTERNATIONAL 2015; 2015:617207. [PMID: 25874222 PMCID: PMC4385658 DOI: 10.1155/2015/617207] [Citation(s) in RCA: 123] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Received: 05/15/2014] [Accepted: 09/10/2014] [Indexed: 12/20/2022]
Abstract
Reactive oxygen species (ROS) production is involved in several apoptotic and necrotic cell death pathways in auditory tissues. These pathways are the major causes of most types of sensorineural hearing loss, including age-related hearing loss, hereditary hearing loss, ototoxic drug-induced hearing loss, and noise-induced hearing loss. ROS production can be triggered by dysfunctional mitochondrial oxidative phosphorylation and increases or decreases in ROS-related enzymes. Although apoptotic cell death pathways are mostly activated by ROS production, there are other pathways involved in hearing loss that do not depend on ROS production. Further studies of other pathways, such as endoplasmic reticulum stress and necrotic cell death, are required.
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Estudio comparativo de la eficacia de los glucocorticoides, mineralocorticoides y vasodilatadores en la recuperación auditiva de pacientes que padecen hipoacusia neurosensorial idiopática de localización coclear. Ensayo clínico preliminar. ACTA OTORRINOLARINGOLOGICA ESPANOLA 2015; 66:65-73. [DOI: 10.1016/j.otorri.2014.05.008] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2013] [Revised: 04/30/2014] [Accepted: 05/20/2014] [Indexed: 11/24/2022]
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A Comparative Study on Efficacy of Glucocorticoids, Mineralocorticoids and Vasoactive Drugs on Reversing Hearing Loss in Patients Suffering Idiopathic Sensorineural Cochlear Hypoacusis. A Preliminary Clinical Trial. ACTA OTORRINOLARINGOLOGICA ESPANOLA 2015. [DOI: 10.1016/j.otoeng.2014.05.021] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Bielefeld EC. Protection from noise-induced hearing loss with Src inhibitors. Drug Discov Today 2015; 20:760-5. [PMID: 25637168 DOI: 10.1016/j.drudis.2015.01.010] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2014] [Revised: 12/09/2014] [Accepted: 01/20/2015] [Indexed: 01/23/2023]
Abstract
Noise-induced hearing loss is a major cause of acquired hearing loss around the world and pharmacological approaches to protecting the ear from noise are under investigation. Noise results in a combination of mechanical and metabolic damage pathways in the cochlea. The Src family of protein tyrosine kinases could be active in both pathways and Src inhibitors have successfully prevented noise-induced cochlear damage and hearing loss in animal models. The long-term goal is to optimize delivery methods into the cochlea to reduce invasiveness and limit side-effects before human clinical testing can be considered. At their current early stage of research investigation, Src inhibitors represent an exciting class of compounds for inclusion in a multifaceted pharmacological approach to protecting the ear from noise.
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Affiliation(s)
- Eric C Bielefeld
- Department of Speech and Hearing Science, The Ohio State University, 110 Pressey Hall, 1070 Carmack Road, Columbus, OH 43210, USA.
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Yamashita D, Sun GW, Cui Y, Mita S, Otsuki N, Kanzaki S, Nibu KI, Ogawa K, Matsunaga T. Neuroprotective effects of cutamesine, a ligand of the sigma-1 receptor chaperone, against noise-induced hearing loss. J Neurosci Res 2015; 93:788-95. [PMID: 25612541 DOI: 10.1002/jnr.23543] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/20/2014] [Revised: 10/28/2014] [Accepted: 11/21/2014] [Indexed: 11/10/2022]
Abstract
The sigma-1 receptor, which is expressed throughout the brain, provides physiological benefits that include higher brain function. The sigma-1 receptor functions as a chaperone in the endoplasmic reticulum and may control cell death and regeneration within the central nervous system. Cutamesine (1-(3,4-dimethoxyphenethyl)-4-(3-phenylpropyl) piperazine dihydrochloride) is a ligand selective for this receptor and may mediate neuroprotective effects in the context of neurodegenerative disease. We therefore assessed whether cutamesine protects the inner ear from noise-induced or aging-associated hearing loss. Immunohistochemistry and Western blotting revealed that the sigma-1 receptor is present in adult cochlea. We treated mice with 0, 3, or 30 mg/kg cutamesine from 10 days before noise exposure until the end of the study. All subjects were exposed to a 120-dB, 4-kHz octave-band noise for 2 hr. We assessed auditory thresholds by measuring the auditory-evoked brainstem responses at 4, 8, and 16 kHz, prior to and 1 week, 1 month, or 3 months following noise exposure. For the aging study, measurements were made before treatment was initiated and after 3 or 9 months of cutamesine treatment. Damage to fibrocytes within the cochlear spiral limbus was assessed by quantitative histology. Cutamesine significantly reduced threshold shifts and cell death within the spiral limbus in response to intense noise. These effects were not dose or time dependent. Conversely, cutamesine did not prevent aging-associated hearing loss. These results suggest that cutamesine reduces noise-induced hearing loss and cochlear damage during the acute phase that follows exposure to an intense noise.
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Affiliation(s)
- Daisuke Yamashita
- Department of Otolaryngology, School of Medicine, Kobe University, Kobe, Japan; Laboratory of Auditory Disorders, Division of Hearing and Balance Research, National Institute of Sensory Organs, National Tokyo Medical Center, Tokyo, Japan; Department of Otolaryngology, School of Medicine, Keio University, Tokyo, Japan
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Thymoquinone treatment for inner-ear acoustic trauma in rats. The Journal of Laryngology & Otology 2015; 129:38-45. [PMID: 25557394 DOI: 10.1017/s0022215114002680] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
OBJECTIVE To investigate whether thymoquinone has any eliminative effects against inner-ear damage caused by acoustic trauma. METHODS Thirty-two male rats were divided into four groups. Group 1 was only exposed to acoustic trauma. Group 2 was given thymoquinone 24 hours before acoustic trauma and continued to receive it for 10 days after the trauma. Group 3 was only treated with thymoquinone, for 10 days. Group 4, the control group, suffered no trauma and received saline instead of thymoquinone. Groups 1 and 2 were exposed to acoustic trauma using 105 dB SPL white noise for 4 hours. RESULTS There was a significant decrease in distortion product otoacoustic emission values and an increase in auditory brainstem response thresholds in group 1 on days 1, 5 and 10, compared with baseline measurements. In group 2, a decrease in distortion product otoacoustic emission values and an increase in auditory brainstem response threshold were observed on day 1 after acoustic trauma, but measurements were comparable to baseline values on days 5 and 10. In group 3, thymoquinone had no detrimental effects on hearing. Similarly, the control group showed stable results. CONCLUSION Thymoquinone was demonstrated to be a reparative rather than preventive treatment that could be used to relieve acoustic trauma.
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129
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Venn R, McBrearty A, McKeegan D, Penderis J. The effect of magnetic resonance imaging noise on cochlear function in dogs. Vet J 2014; 202:141-5. [DOI: 10.1016/j.tvjl.2014.07.006] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2013] [Revised: 05/29/2014] [Accepted: 07/14/2014] [Indexed: 02/08/2023]
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130
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Choi SI, Yoo S, Lim JY, Hwang SW. Are sensory TRP channels biological alarms for lipid peroxidation? Int J Mol Sci 2014; 15:16430-57. [PMID: 25233127 PMCID: PMC4200803 DOI: 10.3390/ijms150916430] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2014] [Revised: 08/15/2014] [Accepted: 08/28/2014] [Indexed: 12/16/2022] Open
Abstract
Oxidative stress induces numerous biological problems. Lipid oxidation and peroxidation appear to be important steps by which exposure to oxidative stress leads the body to a disease state. For its protection, the body has evolved to respond to and eliminate peroxidation products through the acquisition of binding proteins, reducing and conjugating enzymes, and excretion systems. During the past decade, researchers have identified a group of ion channel molecules that are activated by oxidized lipids: transient receptor potential (TRP) channels expressed in sensory neurons. These ion channels are fundamentally detectors and signal converters for body-damaging environments such as heat and cold temperatures, mechanical attacks, and potentially toxic substances. When messages initiated by TRP activation arrive at the brain, we perceive pain, which results in our preparing defensive responses. Excessive activation of the sensory neuronal TRP channels upon prolonged stimulations sometimes deteriorates the inflammatory state of damaged tissues by promoting neuropeptide release from expresser neurons. These same paradigms may also work for pathologic changes in the internal lipid environment upon exposure to oxidative stress. Here, we provide an overview of the role of TRP channels and oxidized lipid connections during abnormally increased oxidative signaling, and consider the sensory mechanism of TRP detection as an alert system.
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Affiliation(s)
- Seung-In Choi
- Department of Biomedical Sciences and Department of Physiology, Korea University College of Medicine, Seoul 136-705, Korea.
| | - Sungjae Yoo
- Department of Biomedical Sciences and Department of Physiology, Korea University College of Medicine, Seoul 136-705, Korea.
| | - Ji Yeon Lim
- Department of Biomedical Sciences and Department of Physiology, Korea University College of Medicine, Seoul 136-705, Korea.
| | - Sun Wook Hwang
- Department of Biomedical Sciences and Department of Physiology, Korea University College of Medicine, Seoul 136-705, Korea.
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131
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Adenosine amine congener as a cochlear rescue agent. BIOMED RESEARCH INTERNATIONAL 2014; 2014:841489. [PMID: 25243188 PMCID: PMC4160640 DOI: 10.1155/2014/841489] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/29/2014] [Accepted: 07/29/2014] [Indexed: 12/20/2022]
Abstract
We have previously shown that adenosine amine congener (ADAC), a selective A1 adenosine receptor agonist, can ameliorate noise- and cisplatin-induced cochlear injury. Here we demonstrate the dose-dependent rescue effects of ADAC on noise-induced cochlear injury in a rat model and establish the time window for treatment. Methods. ADAC (25–300 μg/kg) was administered intraperitoneally to Wistar rats (8–10 weeks old) at intervals (6–72 hours) after exposure to traumatic noise (8–16 kHz, 110 dB sound pressure level, 2 hours). Hearing sensitivity was assessed using auditory brainstem responses (ABR) before and 12 days after noise exposure. Pharmacokinetic studies investigated ADAC concentrations in plasma after systemic (intravenous) administration. Results. ADAC was most effective in the first 24 hours after noise exposure at doses >50 μg/kg, providing up to 21 dB protection (averaged across 8–28 kHz). Pharmacokinetic studies demonstrated a short (5 min) half-life of ADAC in plasma after intravenous administration without detection of degradation products. Conclusion. Our data show that ADAC mitigates noise-induced hearing loss in a dose- and time-dependent manner, but further studies are required to establish its translation as a clinical otological treatment.
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132
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Spankovich C, Le Prell CG. Associations between dietary quality, noise, and hearing: data from the National Health and Nutrition Examination Survey, 1999-2002. Int J Audiol 2014; 53:796-809. [PMID: 24975234 DOI: 10.3109/14992027.2014.921340] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
OBJECTIVE A statistically significant relationship between dietary nutrient intake and threshold sensitivity at higher frequencies has been reported, but evidence conflicts across studies. Here, the potential interaction between noise and diet in their association to hearing was examined. DESIGN This cross-sectional analysis was based on Healthy Eating Index data and audiological threshold pure-tone averages for low (0.5 to 2 kHz) and high (3 to 8 kHz) frequencies. STUDY SAMPLE Data were drawn from the National Health and Nutrition Examination Survey, 1999-2002. RESULTS Controlling for age, sex, race/ethnicity, education, diabetes, hypertension, and smoking we found statistically significant relationships between dietary quality and high-frequency threshold sensitivity as well as noise exposure and high-frequency thresholds. In addition, there was a statistically significant interaction between dietary quality and reported noise exposure with respect to high-frequency threshold sensitivity in participants, where greater reported noise exposure and poorer diet were associated with poorer hearing (p's < 0.05). CONCLUSIONS The current findings support an association between healthier eating and better hearing at higher frequencies; the strength of this relationship varied as a function of participant noise history, with the most robust relationship in those that reported military service or firearm use.
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Affiliation(s)
- C Spankovich
- Department of Speech, Language, and Hearing Sciences, University of Florida , Gainesville , USA
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133
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Role of cysteinyl leukotriene signaling in a mouse model of noise-induced cochlear injury. Proc Natl Acad Sci U S A 2014; 111:9911-6. [PMID: 24958862 DOI: 10.1073/pnas.1402261111] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Noise-induced hearing loss is one of the most common types of sensorineural hearing loss. In this study, we examined the expression and localization of leukotriene receptors and their respective changes in the cochlea after hazardous noise exposure. We found that the expression of cysteinyl leukotriene type 1 receptor (CysLTR1) was increased until 3 d after noise exposure and enhanced CysLTR1 expression was mainly observed in the spiral ligament and the organ of Corti. Expression of 5-lipoxygenase was increased similar to that of CysLTR1, and there was an accompanying elevation of CysLT concentration. Posttreatment with leukotriene receptor antagonist (LTRA), montelukast, for 4 consecutive days after noise exposure significantly decreased the permanent threshold shift and also reduced the hair cell death in the cochlea. Using RNA-sequencing, we found that the expression of matrix metalloproteinase-3 (MMP-3) was up-regulated after noise exposure, and it was significantly inhibited by montelukast. Posttreatment with a MMP-3 inhibitor also protected the hair cells and reduced the permanent threshold shift. These findings suggest that acoustic injury up-regulated CysLT signaling in the cochlea and cochlear injury could be attenuated by LTRA through regulation of MMP-3 expression. This study provides mechanistic insights into the role of CysLTs signaling in noise-induced hearing loss and the therapeutic benefit of LTRA.
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134
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Hydrogen-saturated saline protects intensive narrow band noise-induced hearing loss in guinea pigs through an antioxidant effect. PLoS One 2014; 9:e100774. [PMID: 24945316 PMCID: PMC4063935 DOI: 10.1371/journal.pone.0100774] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2013] [Accepted: 05/29/2014] [Indexed: 11/25/2022] Open
Abstract
The purpose of the current study was to evaluate hydrogen-saturated saline protecting intensive narrow band noise-induced hearing loss. Guinea pigs were divided into three groups: hydrogen-saturated saline; normal saline; and control. For saline administration, the guinea pigs were given daily abdominal injections (1 ml/100 g) 3 days before and 1 h before narrow band noise exposure (2.5–3.5 kHz 130 dB SPL, 1 h). The guinea pigs in the control group received no treatment. The hearing function was assessed by the auditory brainstem response (ABR) and distortion product otoacoustic emission (DPOAE) recording. The changes of free radicals in the cochlea before noise exposure, and immediately and 7 days after noise exposure were also examined. By Scanning electron microscopy and succinate dehydrogenase staining, we found that pre-treatment with hydrogen-saturated saline significantly reduced noise-induced hair cell damage and hearing loss. We also found that the malondialdehyde, lipid peroxidation, and hydroxyl levels were significantly lower in the hydrogen-saturated saline group after noise trauma, indicating that hydrogen-saturated saline can decrease the amount of harmful free radicals caused by noise trauma. Our findings suggest that hydrogen-saturated saline is effective in preventing intensive narrow band noise-induced hearing loss through the antioxidant effect.
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135
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Le Prell CG, Ojano-Dirain C, Rudnick EW, Nelson MA, DeRemer SJ, Prieskorn DM, Miller JM. Assessment of nutrient supplement to reduce gentamicin-induced ototoxicity. J Assoc Res Otolaryngol 2014; 15:375-93. [PMID: 24590390 PMCID: PMC4010593 DOI: 10.1007/s10162-014-0448-x] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2013] [Accepted: 01/28/2014] [Indexed: 12/29/2022] Open
Abstract
Gentamicin is an aminoglycoside antibiotic used to treat gram-negative bacterial infections. Treatment with this antibiotic carries the potential for adverse side effects, including ototoxicity and nephrotoxicity. Ototoxic effects are at least in part a consequence of oxidative stress, and various antioxidants have been used to attenuate gentamicin-induced hair cell death and hearing loss. Here, a combination of nutrients previously shown to reduce oxidative stress in the hair cells and attenuate hearing loss after other insults was evaluated for potential protection against gentamicin-induced ototoxicity. Guinea pigs were maintained on a nutritionally complete standard laboratory animal diet or a diet supplemented with β-carotene, vitamins C and E, and magnesium. Three diets with iterative increases in nutrient levels were screened; the final diet selected for study use was one that produced statistically reliable increases in plasma levels of vitamins C and E and magnesium. In two separate studies, significant decreases in gentamicin-induced hearing loss at frequencies including 12 kHz and below were observed, with less benefit at the higher frequencies. Consistent with the functional protection, robust protection of both the inner and outer hair cell populations was observed, with protection largely in the upper half of the cochlea. Protection was independently assessed in two different laboratories, using two different strains of guinea pigs. Additional in vitro tests did not reveal any decrease in antimicrobial activity with nutrient additives. Currently, there are no FDA-approved treatments for the prevention of gentamicin-induced ototoxicity. The current data provide a rationale for continued investigations regarding translation to human patients.
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136
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Lu J, Li W, Du X, Ewert DL, West MB, Stewart C, Floyd RA, Kopke RD. Antioxidants reduce cellular and functional changes induced by intense noise in the inner ear and cochlear nucleus. J Assoc Res Otolaryngol 2014; 15:353-72. [PMID: 24497307 PMCID: PMC4010594 DOI: 10.1007/s10162-014-0441-4] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Accepted: 01/06/2014] [Indexed: 10/25/2022] Open
Abstract
The present study marks the first evaluation of combined application of the antioxidant N-acetylcysteine (NAC) and the free radical spin trap reagent, disodium 2,4-disulfophenyl-N-tert-butylnitrone (HPN-07), as a therapeutic approach for noise-induced hearing loss (NIHL). Pharmacokinetic studies and C-14 tracer experiments demonstrated that both compounds achieve high blood levels within 30 min after i.p injection, with sustained levels of radiolabeled cysteine (released from NAC) in the cochlea, brainstem, and auditory cortex for up to 48 h. Rats exposed to 115 dB octave-band noise (10-20 kHz) for 1 h were treated with combined NAC/HPN-07 beginning 1 h after noise exposure and for two consecutive days. Auditory brainstem responses (ABR) showed that treatment substantially reduced the degree of threshold shift across all test frequencies (2-16 kHz), beginning at 24 h after noise exposure and continuing for up to 21 days. Reduced distortion product otoacoustic emission (DPOAE) level shifts were also detected at 7 and 21 days following noise exposure in treated animals. Noise-induced hair cell (HC) loss, which was localized to the basal half of the cochlea, was reduced in treated animals by 85 and 64% in the outer and inner HC regions, respectively. Treatment also significantly reduced an increase in c-fos-positive neuronal cells in the cochlear nucleus following noise exposure. However, no detectable spiral ganglion neuron loss was observed after noise exposure. The results reported herein demonstrate that the NAC/HPN-07 combination is a promising pharmacological treatment of NIHL that reduces both temporary and permanent threshold shifts after intense noise exposure and acts to protect cochlear sensory cells, and potentially afferent neurites, from the damaging effects of acoustic trauma. In addition, the drugs were shown to reduce aberrant activation of neurons in the central auditory regions of the brain following noise exposure. It is likely that the protective mechanisms are related to preservation of structural components of the cochlea and blocking the activation of immediate early genes in the auditory centers of the brain.
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Affiliation(s)
- Jianzhong Lu
- />Hough Ear Institute, 3400 N.W. 56th Street, Oklahoma City, OK 73112 USA
| | - Wei Li
- />Hough Ear Institute, 3400 N.W. 56th Street, Oklahoma City, OK 73112 USA
| | - Xiaoping Du
- />Hough Ear Institute, 3400 N.W. 56th Street, Oklahoma City, OK 73112 USA
| | - Donald L. Ewert
- />Hough Ear Institute, 3400 N.W. 56th Street, Oklahoma City, OK 73112 USA
| | - Matthew B. West
- />Hough Ear Institute, 3400 N.W. 56th Street, Oklahoma City, OK 73112 USA
| | - Charles Stewart
- />Oklahoma Medical Research Foundation, Oklahoma City, OK 73104 USA
| | - Robert A. Floyd
- />Oklahoma Medical Research Foundation, Oklahoma City, OK 73104 USA
| | - Richard D Kopke
- />Hough Ear Institute, 3400 N.W. 56th Street, Oklahoma City, OK 73112 USA
- />Oklahoma Medical Research Foundation, Oklahoma City, OK 73104 USA
- />Departments of Physiology and Otolaryngology, University of Oklahoma Health Sciences Center, Oklahoma City, OK 73104 USA
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137
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Attenuation of noise-induced hearing loss using methylene blue. Cell Death Dis 2014; 5:e1200. [PMID: 24763057 PMCID: PMC4001318 DOI: 10.1038/cddis.2014.170] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2014] [Revised: 03/19/2014] [Accepted: 03/19/2014] [Indexed: 01/05/2023]
Abstract
The overproduction of reactive oxygen species (ROS) and reactive nitrogen species (RNS) has been known to contribute to the pathogenesis of noise-induced hearing loss. In this study, we discovered that in BALB/c mice pretreatment with methylene blue (MB) for 4 consecutive days significantly protected against cochlear injury by intense broad-band noise for 3 h. It decreased both compound threshold shift and permanent threshold shift and, further, reduced outer hair cell death in the cochlea. MB also reduced ROS and RNS formation after noise exposure. Furthermore, it protected against rotenone- and antimycin A-induced cell death and also reversed ATP generation in the in vitro UB-OC1 cell system. Likewise, MB effectively attenuated the noise-induced impairment of complex IV activity in the cochlea. In addition, it increased the neurotrophin-3 (NT-3) level, which could affect the synaptic connections between hair cells and spiral ganglion neurons in the noise-exposed cochlea, and also promoted the conservation of both efferent and afferent nerve terminals on the outer and inner hair cells. These findings suggest that the amelioration of impaired mitochondrial electron transport and the potentiation of NT-3 expression by treatment with MB have a significant therapeutic value in preventing ROS-mediated sensorineural hearing loss.
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138
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A putative role of p53 pathway against impulse noise induced damage as demonstrated by protection with pifithrin-alpha and a Src inhibitor. Neurosci Res 2014; 81-82:30-7. [DOI: 10.1016/j.neures.2014.01.006] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Revised: 12/16/2013] [Accepted: 01/17/2014] [Indexed: 11/22/2022]
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139
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Mujica-Mota MA, Gasbarrino K, Rappaport JM, Shapiro RS, Daniel SJ. The effect of caffeine on hearing in a guinea pig model of acoustic trauma. Am J Otolaryngol 2014; 35:99-105. [PMID: 24406118 DOI: 10.1016/j.amjoto.2013.11.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2013] [Accepted: 11/25/2013] [Indexed: 12/16/2022]
Abstract
OBJECTIVE Caffeine is a widely consumed substance affecting the metabolism of adenosine and cellular metabolism of calcium. Noise also affects these metabolic pathways while inducing hearing loss. The aim of this study was to determine the effect of daily intake of caffeine on hearing loss after an episode of acoustic trauma in guinea pigs. MATERIALS AND METHODS In this pilot study, forty guinea pigs were randomly divided into four groups: group I (control, n=10) received intraperitoneal saline, group II (n=10) received intraperitoneal caffeine (120 mg/kg/day) for 14 days, group III (n=10) was exposed to noise (tone of 6 kHz at 120 dB for one hour) and group IV (n=10) was exposed to noise as group III and received caffeine as group II. Auditory brainstem responses were measured at four different frequencies (8, 16, 20, and 25 kHz) prior to and at intervals of 1h, 3 days, 10 days, and 14 days after the initial treatment. On day 14, morphological analysis was performed to assess the effects of caffeine on acoustic trauma. RESULTS Aggravated hearing loss was observed in group IV after 10 days of follow-up. After 14 days, one of the four frequencies (8 kHz) tested showed statistically significant greater impairment in hearing (8.2 ± 3.6 dB, p=0.026). Auditory hair cells showed no difference while spiral ganglion cell counts were diminished in group IV (p<0.05). CONCLUSION These findings indicate that caffeine may have a detrimental effect on hearing recovery after a single event of acoustic trauma.
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MESH Headings
- Animals
- Caffeine/administration & dosage
- Cochlea/ultrastructure
- Disease Models, Animal
- Dose-Response Relationship, Drug
- Drug Administration Schedule
- Evoked Potentials, Auditory, Brain Stem/drug effects
- Female
- Guinea Pigs
- Hearing/drug effects
- Hearing Loss, Noise-Induced/drug therapy
- Hearing Loss, Noise-Induced/pathology
- Hearing Loss, Noise-Induced/physiopathology
- Injections, Intraperitoneal
- Microscopy, Electron, Scanning
- Pilot Projects
- Purinergic P1 Receptor Antagonists/administration & dosage
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Affiliation(s)
- Mario A Mujica-Mota
- McGill Auditory Sciences Laboratory, Montreal Children's Hospital, Department of Otolaryngology-Head and Neck Surgery, McGill University, Montréal, Québec, Canada
| | - Karina Gasbarrino
- McGill Auditory Sciences Laboratory, Montreal Children's Hospital, Department of Otolaryngology-Head and Neck Surgery, McGill University, Montréal, Québec, Canada
| | - Jamie M Rappaport
- McGill Auditory Sciences Laboratory, Montreal Children's Hospital, Department of Otolaryngology-Head and Neck Surgery, McGill University, Montréal, Québec, Canada; Jewish General Hospital, Department of Otolaryngology-Head and Neck Surgery, Montréal, Québec, Canada
| | - Robert S Shapiro
- McGill Auditory Sciences Laboratory, Montreal Children's Hospital, Department of Otolaryngology-Head and Neck Surgery, McGill University, Montréal, Québec, Canada
| | - Sam J Daniel
- McGill Auditory Sciences Laboratory, Montreal Children's Hospital, Department of Otolaryngology-Head and Neck Surgery, McGill University, Montréal, Québec, Canada.
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140
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Ciuman RR. Inner ear symptoms and disease: pathophysiological understanding and therapeutic options. Med Sci Monit 2013; 19:1195-210. [PMID: 24362017 PMCID: PMC3872449 DOI: 10.12659/msm.889815] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2013] [Accepted: 10/11/2013] [Indexed: 12/13/2022] Open
Abstract
In recent years, huge advances have taken place in understanding of inner ear pathophysiology causing sensorineural hearing loss, tinnitus, and vertigo. Advances in understanding comprise biochemical and physiological research of stimulus perception and conduction, inner ear homeostasis, and hereditary diseases with underlying genetics. This review describes and tabulates the various causes of inner ear disease and defines inner ear and non-inner ear causes of hearing loss, tinnitus, and vertigo. The aim of this review was to comprehensively breakdown this field of otorhinolaryngology for specialists and non-specialists and to discuss current therapeutic options in distinct diseases and promising research for future therapies, especially pharmaceutic, genetic, or stem cell therapy.
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141
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Choi CH, Du X, Floyd RA, Kopke RD. Therapeutic effects of orally administrated antioxidant drugs on acute noise-induced hearing loss. Free Radic Res 2013; 48:264-72. [PMID: 24182331 DOI: 10.3109/10715762.2013.861599] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
OBJECTIVE The objective of this study was to investigate the dose-dependent therapeutic effect of the orally administrated antioxidant drugs [4-hydroxy alpha-phenyl-tert-butylnitrone (4-OHPBN) and N-acetyl-L-cysteine (NAC)] on acute noise-induced hearing loss because oral administration is the most commonly used method of drug administration due to its convenience, safety, and economical efficiency. METHODS Thirty chinchilla were exposed to a 105 dB octave band noise centered at 4 kHz for 6 h and randomly assigned to a control group (saline only) and three experimental groups [4-OHPBN (10 mg/kg) plus NAC (20 mg/kg), 4-OHPBN (20 mg/kg) plus NAC (50 mg/kg), and 4-OHPBN (50 mg/kg) plus NAC (100 mg/kg)]. The drugs were orally administrated beginning 4 h after noise exposure and then administered twice daily for the next 2 days. Permanent auditory brainstem response threshold shifts, distortion product otoacoustic emission threshold shifts, and the percentage of missing outer hair cell were determined. RESULTS The oral administration significantly reduced permanent hearing threshold shift, distortion product otoacoustic emission threshold shift, and the percentage of missing outer hair cell in a dose-dependent manner. DISCUSSION This result demonstrates that orally administered drugs can treat acute noise-induced hearing loss in a dose-dependent manner. This suggests that oral administration was effective in treating acute noise-induced hearing loss as in intraperitoneal administration.
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Affiliation(s)
- C-H Choi
- Catholic University of Daegu, Audiology & Speech Language Pathology, Research Institute of Biomimetic Sensory Control, and Catholic Hearing Voice Speech Center , Kyungsansi, Kyungsanbukdo , Republic of Korea
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142
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Claussen AD, Fox DJ, Yu XC, Meech RP, Verhulst SJ, Hargrove TL, Campbell KCM. D-methionine pre-loading reduces both noise-induced permanent threshold shift and outer hair cell loss in the chinchilla. Int J Audiol 2013; 52:801-7. [DOI: 10.3109/14992027.2013.840933] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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143
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Ahn JH, Shin JE, Chung BY, Lee HM, Kang HH, Chung JW, Pak JH. Involvement of retinoic acid-induced peroxiredoxin 6 expression in recovery of noise-induced temporary hearing threshold shifts. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2013; 36:463-471. [PMID: 23792233 DOI: 10.1016/j.etap.2013.05.012] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Revised: 05/23/2013] [Accepted: 05/27/2013] [Indexed: 06/02/2023]
Abstract
All-trans retinoic acid (ATRA) is reported to reduce hair cell loss and hearing deterioration caused by noise-induced hearing loss (NIHL). The present study investigates the involvement of peroxiredoxin 6 (Prdx 6) in ATRA-mediated protection of temporary threshold shift of hearing. Mice fed with ATRA before or after exposure to white noise showed a faster recovery than untreated controls within 1 week, with a concomitant increase of cochlear Prdx 6 expression. Treatment of mouse auditory cells with ATRA induced Prdx 6 expression. A putative retinoic acid (RA)-response element (RARE) was identified in a murine Prdx 6 promoter region. Prdx 6 promoter activities were elevated in wild-type reporter plasmid-transfected cells, whereas no significant change in activity was in those with RARE-disrupted mutant reporter. RA receptor α (RARα) functions as a transactivator of Prdx 6 gene expression. These findings suggest that ATRA-induced Prdx 6 expression may be associated with rapid recovery from temporary NIHL.
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MESH Headings
- Animals
- Auditory Fatigue/drug effects
- Binding Sites
- Cell Line
- Cochlea/drug effects
- Cochlea/metabolism
- Cochlea/physiopathology
- Disease Models, Animal
- Dose-Response Relationship, Drug
- Hearing/drug effects
- Hearing Loss, Noise-Induced/etiology
- Hearing Loss, Noise-Induced/metabolism
- Hearing Loss, Noise-Induced/physiopathology
- Mice
- Mice, Inbred BALB C
- Mutation
- Peroxiredoxin VI/genetics
- Peroxiredoxin VI/metabolism
- Promoter Regions, Genetic
- Receptors, Retinoic Acid/agonists
- Receptors, Retinoic Acid/genetics
- Receptors, Retinoic Acid/metabolism
- Recovery of Function
- Response Elements
- Retinoic Acid Receptor alpha
- Signal Transduction
- Time Factors
- Transcriptional Activation
- Transfection
- Tretinoin/pharmacology
- Up-Regulation
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Affiliation(s)
- Joong Ho Ahn
- Department of Otolaryngology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 138-736, Republic of Korea
| | - Jung-Eun Shin
- Department of Otolaryngology (Head and Neck Surgery), Konkuk University Hospital, Seoul 143-729, Republic of Korea
| | - Bom Yi Chung
- Asan Institute for Life Sciences, University of Ulsan College of Medicine, Asan Medical Center, Seoul 138-736, Republic of Korea
| | - Hye Mi Lee
- Asan Institute for Life Sciences, University of Ulsan College of Medicine, Asan Medical Center, Seoul 138-736, Republic of Korea
| | - Hun Hee Kang
- Asan Institute for Life Sciences, University of Ulsan College of Medicine, Asan Medical Center, Seoul 138-736, Republic of Korea
| | - Jong Woo Chung
- Department of Otolaryngology, University of Ulsan College of Medicine, Asan Medical Center, Seoul 138-736, Republic of Korea.
| | - Jhang Ho Pak
- Asan Institute for Life Sciences, University of Ulsan College of Medicine, Asan Medical Center, Seoul 138-736, Republic of Korea.
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144
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Le Prell CG, Spankovich C, Lobariñas E, Griffiths SK. Extended high-frequency thresholds in college students: effects of music player use and other recreational noise. J Am Acad Audiol 2013; 24:725-39. [PMID: 24131608 PMCID: PMC4111237 DOI: 10.3766/jaaa.24.8.9] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
BACKGROUND Human hearing is sensitive to sounds from as low as 20 Hz to as high as 20,000 Hz in normal ears. However, clinical tests of human hearing rarely include extended high-frequency (EHF) threshold assessments, at frequencies extending beyond 8000 Hz. EHF thresholds have been suggested for use monitoring the earliest effects of noise on the inner ear, although the clinical usefulness of EHF threshold testing is not well established for this purpose. PURPOSE The primary objective of this study was to determine if EHF thresholds in healthy, young adult college students vary as a function of recreational noise exposure. RESEARCH DESIGN A retrospective analysis of a laboratory database was conducted; all participants with both EHF threshold testing and noise history data were included. The potential for "preclinical" EHF deficits was assessed based on the measured thresholds, with the noise surveys used to estimate recreational noise exposure. STUDY SAMPLE EHF thresholds measured during participation in other ongoing studies were available from 87 participants (34 male and 53 female); all participants had hearing within normal clinical limits (≤25 HL) at conventional frequencies (0.25-8 kHz). RESULTS EHF thresholds closely matched standard reference thresholds [ANSI S3.6 (1996) Annex C]. There were statistically reliable threshold differences in participants who used music players, with 3-6 dB worse thresholds at the highest test frequencies (10-16 kHz) in participants who reported long-term use of music player devices (>5 yr), or higher listening levels during music player use. CONCLUSIONS It should be possible to detect small changes in high-frequency hearing for patients or participants who undergo repeated testing at periodic intervals. However, the increased population-level variability in thresholds at the highest frequencies will make it difficult to identify the presence of small but potentially important deficits in otherwise normal-hearing individuals who do not have previously established baseline data.
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Affiliation(s)
- Colleen G Le Prell
- Department of Speech, Language, and Hearing Sciences, University of Florida, Gainesville, FL
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Vlajkovic SM, Lin SCY, Wong ACY, Wackrow B, Thorne PR. Noise-induced changes in expression levels of NADPH oxidases in the cochlea. Hear Res 2013; 304:145-52. [PMID: 23899412 DOI: 10.1016/j.heares.2013.07.012] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/11/2013] [Revised: 06/27/2013] [Accepted: 07/18/2013] [Indexed: 12/13/2022]
Abstract
UNLABELLED NADPH oxidases are enzymes that transport electrons across the plasma membrane and generate superoxide radical from molecular oxygen. The current study investigated the expression and distribution of NOX/DUOX members of the NADPH oxidase family (NOX1-5 and DUOX1-2) in the rat cochlea and their regulation in response to noise. Wistar rats (8-10 weeks) were exposed for 24 h to band noise (8-12 kHz) at moderate (100 dB) or traumatic (110 dB) sound pressure levels (SPL). Animals exposed to ambient noise (45-55 dB SPL) served as controls. Immunohistochemistry demonstrated predominant expression of all NOX/DUOX isoforms in the sensory and supporting cells of the organ of Corti, with very limited immunoexpression in the lateral wall tissues and spiral ganglion neurons. Noise exposure induced up-regulation of NOX1 and DUOX2 in the cochlea, whereas NOX3 was down-regulated. A significant reduction in the intensity of NOX3 immunolabeling was observed in the inner sulcus region of the cochlea after exposure to noise. Post-exposure inhibition of NADPH oxidases by Diphenyleneiodonium (DPI), a broadly selective NADPH oxidase inhibitor, mitigated noise-induced hearing loss. CONCLUSION Noise-induced up-regulation of NOX1 and DUOX2 could be linked to cochlear injury. In contrast, down-regulation of NOX3 may represent an endogenous protective mechanism to reduce oxidative stress in the noise-exposed cochlea. Inhibition of NADPH oxidases is potentially a novel pathway for therapeutic management of noise-induced hearing loss.
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Affiliation(s)
- Srdjan M Vlajkovic
- Department of Physiology, Faculty of Medical and Health Sciences, The University of Auckland, Private Bag 92019, Auckland 1142, New Zealand.
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Bao J, Hungerford M, Luxmore R, Ding D, Qiu Z, Lei D, Yang A, Liang R, Ohlemiller KK. Prophylactic and therapeutic functions of drug combinations against noise-induced hearing loss. Hear Res 2013; 304:33-40. [PMID: 23792074 DOI: 10.1016/j.heares.2013.06.004] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/07/2013] [Revised: 05/31/2013] [Accepted: 06/10/2013] [Indexed: 01/01/2023]
Abstract
Noise is the most common occupational and environmental hazard. Noise-induced hearing loss (NIHL) is the second most common form of sensorineural hearing deficit, after age-related hearing loss (presbycusis). Although promising approaches have been identified for reducing NIHL, currently there are no effective medications to prevent NIHL. Development of an efficacious treatment has been hampered by the complex array of cellular and molecular pathways involved in NIHL. We turned this difficulty into an advantage by asking whether NIHL could be effectively prevented by targeting multiple signaling pathways with a combination of drugs already approved by U.S. Food and Drug Administration (FDA). We previously found that antiepileptic drugs blocking T-type calcium channels had both prophylactic and therapeutic effects for NIHL. NIHL can also be reduced by an up-regulation of glucocorticoid (GC) signaling pathways. Based on these findings, we tested a combination therapy for NIHL that included ethosuximide and zonisamide (anticonvulsants) and dexamethasone and methylprednisolone (synthetic GCs) in mice under exposure conditions typically associated with dramatic permanent threshold shifts (PTS). We first examined possible prophylactic effects for each drug when administered alone 2 h before noise, and calculated the median effective dose (ED50). We then tested for synergistic effects of two-drug combinations (anticonvulsant + GC), and identified combinations with the strongest synergy against NIHL, based on a previously established combination index (CI) metric. We repeated similar tests to determine their therapeutic effects when administered the same drugs 24 h after the noise exposure. Our study shows the feasibility of developing pharmacological intervention in multiple pathways, and discovering drug combinations with optimal synergistic effects in preventing permanent NIHL.
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Affiliation(s)
- Jianxin Bao
- Department of Otolaryngology, Center for Aging, Washington University School of Medicine, 4560 Clayton Avenue, St. Louis, MO 63110, USA.
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Mitochondrial peroxiredoxin 3 regulates sensory cell survival in the cochlea. PLoS One 2013; 8:e61999. [PMID: 23626763 PMCID: PMC3633911 DOI: 10.1371/journal.pone.0061999] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2012] [Accepted: 03/16/2013] [Indexed: 01/25/2023] Open
Abstract
This study delineates the role of peroxiredoxin 3 (Prx3) in hair cell death induced by several etiologies of acquired hearing loss (noise trauma, aminoglycoside treatment, age). In vivo, Prx3 transiently increased in mouse cochlear hair cells after traumatic noise exposure, kanamycin treatment, or with progressing age before any cell loss occurred; when Prx3 declined, hair cell loss began. Maintenance of high Prx3 levels via treatment with the radical scavenger 2,3-dihydroxybenzoate prevented kanamycin-induced hair cell death. Conversely, reducing Prx3 levels with Prx3 siRNA increased the severity of noise-induced trauma. In mouse organ of Corti explants, reactive oxygen species and levels of Prx3 mRNA and protein increased concomitantly at early times of drug challenge. When Prx3 levels declined after prolonged treatment, hair cells began to die. The radical scavenger p-phenylenediamine maintained Prx3 levels and attenuated gentamicin-induced hair cell death. Our results suggest that Prx3 is up-regulated in response to oxidative stress and that maintenance of Prx3 levels in hair cells is a critical factor in their susceptibility to acquired hearing loss.
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Noise-induced hearing loss (NIHL) as a target of oxidative stress-mediated damage: cochlear and cortical responses after an increase in antioxidant defense. J Neurosci 2013; 33:4011-23. [PMID: 23447610 DOI: 10.1523/jneurosci.2282-12.2013] [Citation(s) in RCA: 154] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
This study addresses the relationship between cochlear oxidative damage and auditory cortical injury in a rat model of repeated noise exposure. To test the effect of increased antioxidant defenses, a water-soluble coenzyme Q10 analog (Qter) was used. We analyzed auditory function, cochlear oxidative stress, morphological alterations in auditory cortices and cochlear structures, and levels of coenzymes Q9 and Q10 (CoQ9 and CoQ10, respectively) as indicators of endogenous antioxidant capability. We report three main results. First, hearing loss and damage in hair cells and spiral ganglion was determined by noise-induced oxidative stress. Second, the acoustic trauma altered dendritic morphology and decreased spine number of II-III and V-VI layer pyramidal neurons of auditory cortices. Third, the systemic administration of the water-soluble CoQ10 analog reduced oxidative-induced cochlear damage, hearing loss, and cortical dendritic injury. Furthermore, cochlear levels of CoQ9 and CoQ10 content increased. These findings indicate that antioxidant treatment restores auditory cortical neuronal morphology and hearing function by reducing the noise-induced redox imbalance in the cochlea and the deafferentation effects upstream the acoustic pathway.
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Simultaneous Effects of Exposure to Microwaves and Noise on Male Rats’ Sperm Parameters and Total Antioxidant Capacity. HEALTH SCOPE 2013. [DOI: 10.5812/jhs.8230] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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150
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Ghanbari M, Mortazavi SB, Khavanin A, Khazaei M. Simultaneous Effects of Exposure to Microwaves and Noise on Male Rats’ Sperm Parameters and Total Antioxidant Capacity. HEALTH SCOPE 2013. [DOI: 10.17795/jhealthscope-8230] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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