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Rincon Sabatino S, Sangaletti R, Griswold A, Dietrich WD, King CS, Rajguru SM. Transcriptional response to mild therapeutic hypothermia in noise-induced cochlear injury. Front Neurosci 2024; 17:1296475. [PMID: 38298897 PMCID: PMC10827921 DOI: 10.3389/fnins.2023.1296475] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2023] [Accepted: 12/18/2023] [Indexed: 02/02/2024] Open
Abstract
Introduction Prevention or treatment for acoustic injury has been met with many translational challenges, resulting in the absence of FDA-approved interventions. Localized hypothermia following noise exposure mitigates acute cochlear injury and may serve as a potential avenue for therapeutic approaches. However, the mechanisms by which hypothermia results in therapeutic improvements are poorly understood. Methods This study performs the transcriptomic analysis of cochleae from juvenile rats that experienced noise-induced hearing loss (NIHL) followed by hypothermia or control normothermia treatment. Results Differential gene expression results from RNA sequencing at 24 h post-exposure to noise suggest that NIHL alone results in increased inflammatory and immune defense responses, involving complement activation and cytokine-mediated signaling. Hypothermia treatment post-noise, in turn, may mitigate the acute inflammatory response. Discussion This study provides a framework for future research to optimize hypothermic intervention for ameliorating hearing loss and suggests additional pathways that could be targeted for NIHL therapeutic intervention.
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Affiliation(s)
| | - Rachele Sangaletti
- Department of Otolaryngology, University of Miami, Coral Gables, FL, United States
| | - Anthony Griswold
- Department of Human Genetics, University of Miami, Coral Gables, FL, United States
| | - W. Dalton Dietrich
- The Miami Project to Cure Paralysis, University of Miami, Coral Gables, FL, United States
| | | | - Suhrud M. Rajguru
- Department of Biomedical Engineering, University of Miami, Coral Gables, FL, United States
- Department of Otolaryngology, University of Miami, Coral Gables, FL, United States
- The Miami Project to Cure Paralysis, University of Miami, Coral Gables, FL, United States
- RestorEar Devices LLC, Bozeman, MT, United States
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Naert G, Pasdelou MP, Le Prell CG. Use of the guinea pig in studies on the development and prevention of acquired sensorineural hearing loss, with an emphasis on noise. THE JOURNAL OF THE ACOUSTICAL SOCIETY OF AMERICA 2019; 146:3743. [PMID: 31795705 PMCID: PMC7195866 DOI: 10.1121/1.5132711] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2019] [Revised: 07/30/2019] [Accepted: 08/12/2019] [Indexed: 05/10/2023]
Abstract
Guinea pigs have been used in diverse studies to better understand acquired hearing loss induced by noise and ototoxic drugs. The guinea pig has its best hearing at slightly higher frequencies relative to humans, but its hearing is more similar to humans than the rat or mouse. Like other rodents, it is more vulnerable to noise injury than the human or nonhuman primate models. There is a wealth of information on auditory function and vulnerability of the inner ear to diverse insults in the guinea pig. With respect to the assessment of potential otoprotective agents, guinea pigs are also docile animals that are relatively easy to dose via systemic injections or gavage. Of interest, the cochlea and the round window are easily accessible, notably for direct cochlear therapy, as in the chinchilla, making the guinea pig a most relevant and suitable model for hearing. This article reviews the use of the guinea pig in basic auditory research, provides detailed discussion of its use in studies on noise injury and other injuries leading to acquired sensorineural hearing loss, and lists some therapeutics assessed in these laboratory animal models to prevent acquired sensorineural hearing loss.
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Affiliation(s)
| | | | - Colleen G Le Prell
- School of Behavioral and Brain Sciences, University of Texas at Dallas, Dallas, Texas 75080, USA
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Shin SA, Lyu AR, Jeong SH, Kim TH, Park MJ, Park YH. Acoustic Trauma Modulates Cochlear Blood Flow and Vasoactive Factors in a Rodent Model of Noise-Induced Hearing Loss. Int J Mol Sci 2019; 20:ijms20215316. [PMID: 31731459 PMCID: PMC6862585 DOI: 10.3390/ijms20215316] [Citation(s) in RCA: 33] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2019] [Revised: 10/22/2019] [Accepted: 10/23/2019] [Indexed: 12/12/2022] Open
Abstract
Noise exposure affects the organ of Corti and the lateral wall of the cochlea, including the stria vascularis and spiral ligament. Although the inner ear vasculature and spiral ligament fibrocytes in the lateral wall consist of a significant proportion of cells in the cochlea, relatively little is known regarding their functional significance. In this study, 6-week-old male C57BL/6 mice were exposed to noise trauma to induce transient hearing threshold shift (TTS) or permanent hearing threshold shift (PTS). Compared to mice with TTS, mice with PTS exhibited lower cochlear blood flow and lower vessel diameter in the stria vascularis, accompanied by reduced expression levels of genes involved in vasodilation and increased expression levels of genes related to vasoconstriction. Ultrastructural analyses by transmission electron microscopy revealed that the stria vascularis and spiral ligament fibrocytes were more damaged by PTS than by TTS. Moreover, mice with PTS expressed significantly higher levels of proinflammatory cytokines in the cochlea (e.g., IL-1β, IL-6, and TNF-α). Overall, our findings suggest that cochlear microcirculation and lateral wall pathologies are differentially modulated by the severity of acoustic trauma and are associated with changes in vasoactive factors and inflammatory responses in the cochlea.
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Affiliation(s)
- Sun-Ae Shin
- Department of Otolaryngology-Head and Neck Surgery, College of Medicine, Chungnam National University, Daejeon 35015, Korea; (S.-A.S.); (A.-R.L.)
- Department of Medical Science, College of Medicine, Chungnam National University, Daejeon 35015, Korea;
| | - Ah-Ra Lyu
- Department of Otolaryngology-Head and Neck Surgery, College of Medicine, Chungnam National University, Daejeon 35015, Korea; (S.-A.S.); (A.-R.L.)
- Department of Medical Science, College of Medicine, Chungnam National University, Daejeon 35015, Korea;
| | - Seong-Hun Jeong
- Department of Medical Science, College of Medicine, Chungnam National University, Daejeon 35015, Korea;
| | - Tae Hwan Kim
- Biomedical Convergence Research Center, Chungnam National University Hospital, Daejeon 35015, Korea;
| | - Min Jung Park
- Department of Otolaryngology-Head and Neck Surgery, College of Medicine, Chungnam National University, Daejeon 35015, Korea; (S.-A.S.); (A.-R.L.)
- Brain Research Institute, College of Medicine, Chungnam National University, Daejeon 35015, Korea
- Correspondence: (M.J.P.); (Y.-H.P.); Tel.: +82-42-280-7697(M.J.P.); Fax: +82-42-253-4059 (M.J.P.)
| | - Yong-Ho Park
- Department of Otolaryngology-Head and Neck Surgery, College of Medicine, Chungnam National University, Daejeon 35015, Korea; (S.-A.S.); (A.-R.L.)
- Brain Research Institute, College of Medicine, Chungnam National University, Daejeon 35015, Korea
- Correspondence: (M.J.P.); (Y.-H.P.); Tel.: +82-42-280-7697(M.J.P.); Fax: +82-42-253-4059 (M.J.P.)
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Arpornchayanon W, Canis M, Suckfuell M, Ihler F, Olzowy B, Strieth S. Modeling the measurements of cochlear microcirculation and hearing function after loud noise. Otolaryngol Head Neck Surg 2011; 145:463-9. [PMID: 21636842 DOI: 10.1177/0194599811407829] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
OBJECTIVE Recent findings support the crucial role of microcirculatory disturbance and ischemia for hearing impairment especially after noise-induced hearing loss (NIHL). The aim of this study was to establish an animal model for in vivo analysis of cochlear microcirculation and hearing function after a loud noise to allow precise measurements of both parameters in vivo. STUDY DESIGN Randomized controlled trial. Setting. Animal study. Subjects and Methods. After assessment of normacusis (0 minutes) using evoked auditory brainstem responses (ABRs), noise (106-dB sound pressure level [SPL]) was applied to both ears in 6 guinea pigs for 30 minutes while unexposed animals served as controls. In vivo fluorescence microscopy of the stria vascularis capillaries was performed after surgical exposure of 1 cochlea. ABR measurements were derived from the contralateral ear. RESULTS After noise exposure, red blood cell velocity was reduced significantly by 24.3% (120 minutes) and further decreased to 44.5% at the end of the observation (210 minutes) in contrast to stable control measurements. Vessel diameters were not affected in both groups. A gradual decrease of segmental blood flow became significant (38.1%) after 150 minutes compared with controls. Hearing thresholds shifted significantly from 20.0 ± 5.5 dB SPL (0 minutes) to 32.5 ± 4.2 dB SPL (60 minutes) only in animals exposed to loud noise. CONCLUSION With regard to novel treatments targeting the stria vascularis in NIHL, this standardized model allows us to analyze in detail cochlear microcirculation and hearing function in vivo.
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Morioka I, Miyashita K, Takeda S. Noise‐Induced Hearing Loss in Working Environment and its Background. J Occup Health 2006. [DOI: 10.1539/joh.39.5] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Affiliation(s)
- Ikuharu Morioka
- Department of HygieneSchool of Medicine, Wakayama Medical University
| | | | - Shintaro Takeda
- Department of HygieneSchool of Medicine, Wakayama Medical University
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Abstract
Chemical asphyxiants have been shown to potentiate noise-induced hearing loss (NIHL) in our previous reports. However, it is still unclear whether hypoxia interacts with noise to potentiate NIHL. This is an important issue, since many people at risk of exposure to noise may also suffer from hypoxia. In the present study, rats were exposed to 14.1-kHz octave-band noise at 105, 110, and 115 dB SPL and hypoxic air (10% O(2) and 18% O(2)) for 4 h. Cochlear compound action potential threshold loss and hair cell loss were determined 4 weeks after the exposure. Though the hypoxia did not cause hearing loss and hair cell loss, the combined exposure to noise and hypoxic air caused more hearing loss and hair cell loss than the noise alone. The NIHL potentiation by hypoxia appeared to increase linearly with the hypoxia level. 10% O(2) exposure significantly potentiated NIHL and 18% O(2) exposure also showed an evident NIHL potentiation. This suggests that people suffering from hypoxia may have increased risk to noise trauma.
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Affiliation(s)
- Guang-Di Chen
- University of Oklahoma Health Sciences Center, College of Pharmacy, P.O. Box 26901, Oklahoma City, OK 73190, USA
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Miani C, Bertino G, Francescato MP, di Prampero PE, Staffieri A. Temporary threshold shift induced by physical exercise. SCANDINAVIAN AUDIOLOGY 1996; 25:179-86. [PMID: 8881006 DOI: 10.3109/01050399609048002] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
Several studies have demonstrated how physical exercise can increase noise-induced temporary threshold shifts (TTS), but until now no evidence of TTS exclusively attributable to physical activity has yet been reported. In this study the hearing pure-tone thresholds of 10 subjects were evaluated at rest and at three designated times following the end of a work load corresponding to 50% and 80% of the maximum oxygen uptake (VO2 max). The results obtained demonstrate a definite effect of physical exercise on the hearing threshold at 6000 and 8000 Hz and that the higher the frequency, the greater the chance of detecting a TTS. Evaluation of the variations in some physiologic parameters (VO2 max, blood lactate and blood pressure) could not statistically correlate the same with TTS. The physiopathologic mechanisms responsible for TTS are still unknown and require further studies which should make allowances for the deferred effects of metabolic variations on the cochlear function.
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Affiliation(s)
- C Miani
- ENT Clinic, University of Udine, Italy
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Ohlsén A, Hultcrantz E, Larsen HC, Angelborg C. The cochlear blood flow: a comparison between the laser Doppler and the microsphere surface methods. Acta Otolaryngol 1994; 114:4-10. [PMID: 8128851 DOI: 10.3109/00016489409126009] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Abstract
Since the introduction in the early 1980s, of the laser Doppler (LD) method for measuring cochlear blood flow (CBF) it has been debated whether the measured changes reflect the total or regional blood flow and whether the method per se influences the CBF. In order to answer those questions, the effect of one vasodilating drug, sodium nitroprusside, was investigated after topical application on the round window membrane (RWM) with respect to its influence on CBF. Two different techniques, the microspheres surface method and the LD method, were used. Untreated animals and animals which received saline or nicotine acid on the RWM were used as controls. The effects on CBF and blood pressure (BP) were continuously registered with LD. When a maximal flow had stabilized, 6 x 10(6) microspheres were injected into the left side of the heart. After the microspheres had been distributed within the body, the animals were killed. Both cochleae were microdissected and the microspheres counted turn by turn in the lateral wall. The number of spheres in the two ears was compared and the difference was recorded as the increase caused by the drug. The percentage change in CBF measured using the LD was compared with that obtained by using the microsphere surface method (MSM). No change in CBF measured by the two techniques was registered in the untreated animals, or after saline or nicotinic acid, while sodium nitroprusside induced a substantial increase in CBF. The mean percentage change of CBF measured with the LD method was compared with the calculated mean percentage change of microspheres for all turns in the cochlea, and in the first turn. Student's t-test and the linear correlation coefficient were calculated.(ABSTRACT TRUNCATED AT 250 WORDS)
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Affiliation(s)
- A Ohlsén
- Department of Otorhinolaryngology, University Hospital, Uppsala, Sweden
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