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Alvarado JC, Fuentes-Santamaría V, Benítez-Maicán Z, Díaz García CM, Gabaldón Ull MC, Juiz JM. An electrophysiological early marker of age-related hearing loss in the Wistar rat model. Heliyon 2024; 10:e40314. [PMID: 39584077 PMCID: PMC11585878 DOI: 10.1016/j.heliyon.2024.e40314] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2024] [Revised: 11/08/2024] [Accepted: 11/08/2024] [Indexed: 11/26/2024] Open
Abstract
The goal of the present study was to determine, through a detailed study of the auditory brainstem response (ABR) waves, the possible existence of an early functional marker for the onset of presbycusis in an animal model. Toward this goal, Wistar rats were divided into four age groups: 3-month-old (3M, n = 6, control), 9-month-old (9M, n = 6), 14-month-old (14M, n = 6), and 20-month-old (20M, n = 6). ABR recordings were performed at 0.5, 1, 2, 4, 8, 16, and 32 kHz. The novel result reported here is that wave amplitudes, particularly wave II, were significantly diminished in the 9M group, even though there was no evidence of significant age-related threshold shift at that age. A significant increase in auditory thresholds with age was first detected at 14M, which further progressed at 20M, confirming our previous findings. These findings suggest that measurable alterations in ABR waves may precede age-related threshold shift and could serve as early markers to detect the onset of age-related hearing loss. Upon translation to humans, they could be used to implement early objective diagnosis, crucial to prevent or mitigate the negative consequences of presbycusis, a common, progressive, and irreversible neurodegenerative age-related disorder. This may allow, for instance, a better preservation of residual hearing, thus delaying the progression of the disease and minimizing the impact of hearing loss, ultimately improving the quality of life for those who suffer from this neurodegenerative condition.
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Affiliation(s)
- Juan Carlos Alvarado
- Facultad de Medicina e Instituto de Biomedicina, Universidad de Castilla-La Mancha, Albacete, Spain
| | | | - Zaskya Benítez-Maicán
- Facultad de Medicina e Instituto de Biomedicina, Universidad de Castilla-La Mancha, Albacete, Spain
| | | | - María Cruz Gabaldón Ull
- Facultad de Medicina e Instituto de Biomedicina, Universidad de Castilla-La Mancha, Albacete, Spain
| | - José M. Juiz
- Facultad de Medicina e Instituto de Biomedicina, Universidad de Castilla-La Mancha, Albacete, Spain
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Wu Q, Liu M, Ma T, Hu Q, Yuan C, Zhang X, Zhang T. Research trends and hotspot analysis of age-related hearing loss: A bibliometric analysis from 2019 to 2023. Exp Gerontol 2024; 194:112489. [PMID: 38936439 DOI: 10.1016/j.exger.2024.112489] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2024] [Revised: 06/07/2024] [Accepted: 06/11/2024] [Indexed: 06/29/2024]
Abstract
BACKGROUND Age-related hearing loss (ARHL) - also termed presbycusis - is prevalent among older adults, leading to a range of issues. Although considerable progress in the understanding of ARHL over the decades, available reports lack data from recent years and do not comprehensively reflect the latest advancements and trends. Therefore, our study sought to assess research hotspots and trends in ARHL over the past 5 years to provide the basis for future research. MATERIALS AND METHODS The Web of Science Core Collection database was searched and screened from January 1, 2019 to October 21, 2023, according to the inclusion criteria. CiteSpace (5.8.R3), VOSviewer (1.6.19), and Microsoft Excel 2019 were employed for bibliometric analysis and visualization. RESULTS 3084 articles from 92 countries led by the United States and China were included. There has been a steady upward trend in the number of publications from 2019 to 2023. The most productive institutions, authors, and journals are Johns Hopkins University (n = 113), Lin FR (n = 66), and Ear and Hearing (n = 135), respectively. Trend topic analyses revealed that "cochlear synaptopathy" and "dementia" were the predominant foci. Keywords, including "individuals" and "national health", began to appear. CONCLUSION Over the past 5 years, the annual number of publications has increased significantly and will continue to do so. Research on the mechanism of ARHL, represented by "oxidative stress", is a continuing focus. Emerging topics such as "individual differences" and "national health" may be potential future hotspots in this field.
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Affiliation(s)
- Qilong Wu
- Department of Otolaryngology Head and Neck Surgery, First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, China
| | - Mengting Liu
- Department of Otolaryngology Head and Neck Surgery, First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, China
| | - Tianyu Ma
- Department of Otolaryngology Head and Neck Surgery, First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, China
| | - Qi Hu
- Department of Otolaryngology Head and Neck Surgery, First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, China
| | - Chenyang Yuan
- Department of Otolaryngology Head and Neck Surgery, First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, China
| | - Xiaopeng Zhang
- Department of Otolaryngology Head and Neck Surgery, First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, China
| | - Tianhong Zhang
- Department of Otolaryngology Head and Neck Surgery, First Affiliated Hospital of Harbin Medical University, Harbin, Heilongjiang 150001, China.
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Buján GE, D'Alessio L, Serra HA, Guelman LR, Molina SJ. Assessment of Hippocampal-Related Behavioral Changes in Adolescent Rats of both Sexes Following Voluntary Intermittent Ethanol Intake and Noise Exposure: A Putative Underlying Mechanism and Implementation of a Non-pharmacological Preventive Strategy. Neurotox Res 2024; 42:29. [PMID: 38856796 DOI: 10.1007/s12640-024-00707-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 04/16/2024] [Accepted: 05/27/2024] [Indexed: 06/11/2024]
Abstract
Ethanol (EtOH) intake and noise exposure are particularly concerning among human adolescents because the potential to harm brain. Unfortunately, putative underlying mechanisms remain to be elucidated. Moreover, implementing non-pharmacological strategies, such as enriched environments (EE), would be pertinent in the field of neuroprotection. This study aims to explore possible underlying triggering mechanism of hippocampus-dependent behaviors in adolescent animals of both sexes following ethanol intake, noise exposure, or a combination of both, as well as the impact of EE. Adolescent Wistar rats of both sexes were subjected to an intermittent voluntary EtOH intake paradigm for one week. A subgroup of animals was exposed to white noise for two hours after the last session of EtOH intake. Some animals of both groups were housed in EE cages. Hippocampal-dependent behavioral assessment and hippocampal oxidative state evaluation were performed. Results show that different hippocampal-dependent behavioral alterations might be induced in animals of both sexes after EtOH intake and sequential noise exposure, that in some cases are sex-specific. Moreover, hippocampal oxidative imbalance seems to be one of the potential underlying mechanisms. Additionally, most behavioral and oxidative alterations were prevented by EE. These findings suggest that two frequently found environmental agents may impact behavior and oxidative pathways in both sexes in an animal model. In addition, EE resulted a partially effective neuroprotective strategy. Therefore, it could be suggested that the implementation of a non-pharmacological approach might also potentially provide neuroprotective advantages against other challenges. Finally, considering its potential for translational human benefit might be worth.
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Affiliation(s)
- G E Buján
- Facultad de Medicina, Departamento de Toxicología y Farmacología, 1ª Cátedra de Farmacología, Buenos Aires, Universidad de Buenos Aires (UBA), Paraguay 2155, piso 15, 1121, Ciudad Autónoma de Buenos Aires, Argentina
| | - L D'Alessio
- Facultad de Medicina, Departamento de Toxicología y Farmacología, 1ª Cátedra de Farmacología, Buenos Aires, Universidad de Buenos Aires (UBA), Paraguay 2155, piso 15, 1121, Ciudad Autónoma de Buenos Aires, Argentina
- Instituto de Biología Celular y Neurociencias (IBCN), Universidad de Buenos Aires (UBA)-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
| | - H A Serra
- Facultad de Medicina, Departamento de Toxicología y Farmacología, 1ª Cátedra de Farmacología, Buenos Aires, Universidad de Buenos Aires (UBA), Paraguay 2155, piso 15, 1121, Ciudad Autónoma de Buenos Aires, Argentina
| | - L R Guelman
- Facultad de Medicina, Departamento de Toxicología y Farmacología, 1ª Cátedra de Farmacología, Buenos Aires, Universidad de Buenos Aires (UBA), Paraguay 2155, piso 15, 1121, Ciudad Autónoma de Buenos Aires, Argentina.
- Centro de Estudios Farmacológicos y Botánicos (CEFyBO), Universidad de Buenos Aires (UBA)-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina.
| | - S J Molina
- Centro de Estudios Farmacológicos y Botánicos (CEFyBO), Universidad de Buenos Aires (UBA)-Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires, Argentina
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Fuentes-Santamaría V, Benítez-Maicán Z, Alvarado JC, Fernández Del Campo IS, Gabaldón-Ull MC, Merchán MA, Juiz JM. Surface electrical stimulation of the auditory cortex preserves efferent medial olivocochlear neurons and reduces cochlear traits of age-related hearing loss. Hear Res 2024; 447:109008. [PMID: 38636186 DOI: 10.1016/j.heares.2024.109008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/23/2024] [Revised: 03/19/2024] [Accepted: 04/11/2024] [Indexed: 04/20/2024]
Abstract
The auditory cortex is the source of descending connections providing contextual feedback for auditory signal processing at almost all levels of the lemniscal auditory pathway. Such feedback is essential for cognitive processing. It is likely that corticofugal pathways are degraded with aging, becoming important players in age-related hearing loss and, by extension, in cognitive decline. We are testing the hypothesis that surface, epidural stimulation of the auditory cortex during aging may regulate the activity of corticofugal pathways, resulting in modulation of central and peripheral traits of auditory aging. Increased auditory thresholds during ongoing age-related hearing loss in the rat are attenuated after two weeks of epidural stimulation with direct current applied to the surface of the auditory cortex for two weeks in alternate days (Fernández del Campo et al., 2024). Here we report that the same cortical electrical stimulation protocol induces structural and cytochemical changes in the aging cochlea and auditory brainstem, which may underlie recovery of age-degraded auditory sensitivity. Specifically, we found that in 18 month-old rats after two weeks of cortical electrical stimulation there is, relative to age-matched non-stimulated rats: a) a larger number of choline acetyltransferase immunoreactive neuronal cell body profiles in the ventral nucleus of the trapezoid body, originating the medial olivocochlear system.; b) a reduction of age-related dystrophic changes in the stria vascularis; c) diminished immunoreactivity for the pro-inflammatory cytokine TNFα in the stria vascularis and spiral ligament. d) diminished immunoreactivity for Iba1 and changes in the morphology of Iba1 immunoreactive cells in the lateral wall, suggesting reduced activation of macrophage/microglia; d) Increased immunoreactivity levels for calretinin in spiral ganglion neurons, suggesting excitability modulation by corticofugal stimulation. Altogether, these findings support that non-invasive neuromodulation of the auditory cortex during aging preserves the cochlear efferent system and ameliorates cochlear aging traits, including stria vascularis dystrophy, dysregulated inflammation and altered excitability in primary auditory neurons.
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Affiliation(s)
- V Fuentes-Santamaría
- School of Medicine, Universidad de Castilla-La Mancha (UCLM), Campus in Albacete, 02008, Albacete, Spain
| | - Z Benítez-Maicán
- School of Medicine, Universidad de Castilla-La Mancha (UCLM), Campus in Albacete, 02008, Albacete, Spain
| | - J C Alvarado
- School of Medicine, Universidad de Castilla-La Mancha (UCLM), Campus in Albacete, 02008, Albacete, Spain
| | - I S Fernández Del Campo
- Lab. of Auditory Neuroplasticity, Institute for Neuroscience of Castilla y León (INCYL), University of Salamanca, Salamanca, Spain
| | - M C Gabaldón-Ull
- School of Medicine, Universidad de Castilla-La Mancha (UCLM), Campus in Albacete, 02008, Albacete, Spain
| | - M A Merchán
- Lab. of Auditory Neuroplasticity, Institute for Neuroscience of Castilla y León (INCYL), University of Salamanca, Salamanca, Spain
| | - J M Juiz
- School of Medicine, Universidad de Castilla-La Mancha (UCLM), Campus in Albacete, 02008, Albacete, Spain; Hannover Medical School, Dept. of Otolaryngology and Cluster of Excellence "H4all" of the German Research Foundation, DFG, Carl-Neuberg-Str. 1, 30625 Hannover, Germany.
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Kim J, Lee Y, Seo E, Kim D, Lee J, Jeong Y, Kwon S, Jeong J, Lee W. Association between hearing loss and high-sensitivity C-reactive protein: the Kangbuk Samsung Cohort Study. Ann Occup Environ Med 2023; 35:e38. [PMID: 37928374 PMCID: PMC10621009 DOI: 10.35371/aoem.2023.35.e38] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2023] [Revised: 08/09/2023] [Accepted: 08/23/2023] [Indexed: 11/07/2023] Open
Abstract
Background Hearing loss (HL) is linked to an elevated risk of cardiovascular diseases (CVDs). The pathogeneses of HL and CVD commonly involve inflammatory responses. Previous studies investigated elevated levels of inflammatory biomarkers in subjects with HL, however, their findings did not demonstrate statistical significance. In our cross-sectional and longitudinal study, we investigated the correlation between HL and increased high-sensitivity C-reactive protein (hsCRP) levels to determine how HL is associated with CVDs. Methods We conducted a cross-sectional study with workers aged over 18 years who underwent health check-ups at our institution between 2012 and 2018 (n = 566,507), followed by conducting a longitudinal study of workers aged > 18 who underwent health checkups at least twice at our institution between 2012 and 2018 (n = 173,794). The definition of HL was as an average threshold of ≥ 20 dB in pure-tone air conduction at 0.5, 1.0, and 2.0 kHz in both ears. The incidence of increased hsCRP levels throughout the follow-up period was defined as a level exceeding 3 mg/L. Logistic regression and generalized estimating equations were performed to estimate the risk of increased hsCRP levels according to the occurrence of HL in groups stratified by age. Results In the cross-sectional study, the multivariate-adjusted odds ratio (OR) was 1.17 (95% confidence interval [CI]: 1.02-1.34); the OR was 0.99 (95% CI: 0.80-1.22) in those under 40 and 1.28 (1.08-1.53) in those over 40. In the longitudinal study, the multivariable-adjusted OR was 1.05 (95% CI: 0.92-1.19); the OR was 1.10 (95% CI: 0.90-1.35) in those under 40 and 1.20 (1.01-1.43) in those over 40. Conclusions This cross-sectional and longitudinal study identified an association between HL and increased hsCRP levels in workers aged over 40 years.
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Affiliation(s)
- Jihoon Kim
- Department of Occupational and Environmental Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Yesung Lee
- Medical Support Division, Pyeongchang County Public Health Clinic, Pyeongchang, Korea
| | - Eunhye Seo
- Department of Occupational and Environmental Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Daehoon Kim
- Department of Occupational and Environmental Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Jaehong Lee
- Department of Occupational and Environmental Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Youshik Jeong
- Department of Occupational and Environmental Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Seonghyun Kwon
- Department of Occupational and Environmental Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Jinsook Jeong
- Department of Occupational and Environmental Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Woncheol Lee
- Department of Occupational and Environmental Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea
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Vasconcelos RO, Gordillo-Martinez F, Ramos A, Lau IH. Effects of Noise Exposure and Ageing on Anxiety and Social Behaviour in Zebrafish. BIOLOGY 2023; 12:1165. [PMID: 37759565 PMCID: PMC10525370 DOI: 10.3390/biology12091165] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 08/11/2023] [Accepted: 08/11/2023] [Indexed: 09/29/2023]
Abstract
Noise pollution is creating a wide range of health problems related to physiological stress and anxiety that impact the social life of vertebrates, including humans. Ageing is known to be associated with changes in susceptibility to acoustic stimuli; however, the interaction between noise effects and senescence is not well understood. We tested the effects of 24 h continuous white noise (150 dB re 1 Pa) on both young adults and old zebrafish in terms of anxiety (novel tank diving test), social interactions (with mirror/conspecific attraction), and shoaling behaviour. Both noise and ageing induced higher anxiety responses in a novel environment. Since the old zebrafish showed longer bottom dwelling, acoustic treatment induced the opposite pattern with an initial increase in vertical exploration in the aged individuals. Both noise- and age-related anxiety responses were lowered when individuals were tested within a group. Regarding social interactions, both noise and ageing seemed to cause an increase in their proximity to a mirror. Although the results were not statistically significant, noise exposure seemed to further enhance conspecific attraction. Moreover, the interindividual distance within a shoal decreased with noise treatment in the aged individuals. This study is a first attempt to investigate the effects of both noise and ageing on zebrafish behaviour, suggesting the age-dependent physiological coping mechanisms associated with environmental stress.
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Affiliation(s)
- Raquel O. Vasconcelos
- Institute of Science and Environment, University of Saint Joseph, Macao, China
- MARE–Marine and Environmental Sciences Centre/ARNET—Aquatic Research Network, Faculdade de Ciências, Universidade de Lisboa, 1749-016 Lisbon, Portugal
- EPCV–Department of Life Sciences, Lusófona University, 1749-024 Lisbon, Portugal
| | | | - Andreia Ramos
- Institute of Science and Environment, University of Saint Joseph, Macao, China
| | - Ieng Hou Lau
- Institute of Science and Environment, University of Saint Joseph, Macao, China
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Ma P, Wang S, Geng R, Gong Y, Li M, Xie D, Dong Y, Zheng T, Li B, Zhao T, Zheng Q. MiR-29a-deficiency causes thickening of the basilar membrane and age-related hearing loss by upregulating collagen IV and laminin. Front Cell Neurosci 2023; 17:1191740. [PMID: 37275774 PMCID: PMC10232818 DOI: 10.3389/fncel.2023.1191740] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 05/03/2023] [Indexed: 06/07/2023] Open
Abstract
Age-related hearing loss (ARHL) is the most common sensory degenerative disease and can significantly impact the quality of life in elderly people. A previous study using GeneChip miRNA microarray assays showed that the expression of miR-29a changes with age, however, its role in hearing loss is still unclear. In this study, we characterized the cochlear phenotype of miR-29a knockout (miR-29a-/-) mice and found that miR-29a-deficient mice had a rapid progressive elevation of the hearing threshold from 2 to 5 months of age compared with littermate controls as measured by the auditory brainstem response. Stereocilia degeneration, hair cell loss and abnormal stria vascularis (SV) were observed in miR-29a-/- mice at 4 months of age. Transcriptome sequencing results showed elevated extracellular matrix (ECM) gene expression in miR-29a-/- mice. Both Gene Ontology (GO) annotation and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway enrichment analysis revealed that the key differences were closely related to ECM. Further examination with a transmission electron microscope showed thickening of the basilar membrane in the cochlea of miR-29a-/- mice. Five Col4a genes (Col4a1-a5) and two laminin genes (Lamb2 and Lamc1) were validated as miR-29a direct targets by dual luciferase assays and miR-29a inhibition assays with a miR-29a inhibitor. Consistent with the target gene validation results, the expression of these genes was significantly increased in the cochlea of miR-29a-/- mice, as shown by RT-PCR and Western blot. These findings suggest that miR-29a plays an important role in maintaining cochlear structure and function by regulating the expression of collagen and laminin and that the disturbance of its expression could be a cause of progressive hearing loss.
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Affiliation(s)
- Peng Ma
- School of Basic Medicine, Qingdao University, Qingdao, China
- School of Basic Medicine, Binzhou Medical University, Yantai, China
| | - Shuli Wang
- Department of Hearing and Speech Rehabilitation, School of Special Education, Binzhou Medical University, Yantai, China
| | - Ruishuang Geng
- Department of Hearing and Speech Rehabilitation, School of Special Education, Binzhou Medical University, Yantai, China
| | - Yongfeng Gong
- School of Basic Medicine, Binzhou Medical University, Yantai, China
| | - Mulan Li
- Department of Hearing and Speech Rehabilitation, School of Special Education, Binzhou Medical University, Yantai, China
| | - Daoli Xie
- Department of Hearing and Speech Rehabilitation, School of Special Education, Binzhou Medical University, Yantai, China
| | - Yaning Dong
- Department of Hearing and Speech Rehabilitation, School of Special Education, Binzhou Medical University, Yantai, China
| | - Tihua Zheng
- Department of Hearing and Speech Rehabilitation, School of Special Education, Binzhou Medical University, Yantai, China
| | - Bo Li
- Department of Hearing and Speech Rehabilitation, School of Special Education, Binzhou Medical University, Yantai, China
| | - Tong Zhao
- Department of Hearing and Speech Rehabilitation, School of Special Education, Binzhou Medical University, Yantai, China
| | - Qingyin Zheng
- School of Basic Medicine, Qingdao University, Qingdao, China
- Department of Otolaryngology, Case Western Reserve University, Cleveland, OH, United States
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Paciello F, Pisani A, Rinaudo M, Cocco S, Paludetti G, Fetoni AR, Grassi C. Noise-induced auditory damage affects hippocampus causing memory deficits in a model of early age-related hearing loss. Neurobiol Dis 2023; 178:106024. [PMID: 36724860 DOI: 10.1016/j.nbd.2023.106024] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Revised: 01/26/2023] [Accepted: 01/27/2023] [Indexed: 01/30/2023] Open
Abstract
Several studies identified noise-induced hearing loss (NIHL) as a risk factor for sensory aging and cognitive decline processes, including neurodegenerative diseases, such as dementia and age-related hearing loss (ARHL). Although the association between noise- and age-induced hearing impairment has been widely documented by epidemiological and experimental studies, the molecular mechanisms underlying this association are not fully understood as it is not known how these risk factors (aging and noise) can interact, affecting memory processes. We recently found that early noise exposure in an established animal model of ARHL (C57BL/6 mice) accelerates the onset of age-related cochlear dysfunctions. Here, we extended our previous data by investigating what happens in central brain structures (auditory cortex and hippocampus), to assess the relationship between hearing and memory impairment and the possible combined effect of noise and sensory aging on the cognitive domain. To this aim, we exposed juvenile C57BL/6 mice of 2 months of age to repeated noise sessions (60 min/day, pure tone of 100 dB SPL, 10 kHz, 10 consecutive days) and we monitored auditory threshold by measuring auditory brainstem responses (ABR), spatial working memory, by using the Y-maze test, and basal synaptic transmission by using ex vivo electrophysiological recordings, at different time points (1, 4 and 7 months after the onset of noise exposure, corresponding to 3, 6 and 9 months of age). We found that hearing loss, along with accelerated presbycusis onset, can induce persistent synaptic alterations in the auditory cortex. This was associated with decreased memory performance and oxidative-inflammatory injury in the hippocampus, the extra-auditory structure involved in memory processes. Collectively, our data confirm the critical relationship between auditory and memory circuits, suggesting that the combined detrimental effect of noise and sensory aging on hearing function can be considered a high-risk factor for both sensory and cognitive degenerative processes, given that early noise exposure accelerates presbycusis phenotype and induces hippocampal-dependent memory dysfunctions.
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Affiliation(s)
- Fabiola Paciello
- Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Roma, Italy; Department of Neuroscience, Università Cattolica del Sacro Cuore, 00168 Roma, Italy
| | - Anna Pisani
- Department of Head and Neck Surgery, Università Cattolica del Sacro Cuore, Roma, Italy
| | - Marco Rinaudo
- Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Roma, Italy; Department of Neuroscience, Università Cattolica del Sacro Cuore, 00168 Roma, Italy
| | - Sara Cocco
- Department of Neuroscience, Università Cattolica del Sacro Cuore, 00168 Roma, Italy
| | - Gaetano Paludetti
- Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Roma, Italy; Department of Head and Neck Surgery, Università Cattolica del Sacro Cuore, Roma, Italy
| | - Anna Rita Fetoni
- Department of Head and Neck Surgery, Università Cattolica del Sacro Cuore, Roma, Italy; Department of Neuroscience, Unit of Audiology, Università degli Studi di Napoli Federico II, Naples, Italy.
| | - Claudio Grassi
- Fondazione Policlinico Universitario A. Gemelli IRCCS, 00168 Roma, Italy; Department of Neuroscience, Università Cattolica del Sacro Cuore, 00168 Roma, Italy
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Idiopathic sudden sensorineural hearing loss: A critique on corticosteroid therapy. Hear Res 2022; 422:108565. [PMID: 35816890 DOI: 10.1016/j.heares.2022.108565] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/11/2021] [Revised: 06/10/2022] [Accepted: 06/25/2022] [Indexed: 11/22/2022]
Abstract
Idiopathic sudden sensorineural hearing loss (ISSNHL) is a condition affecting 5-30 per 100,000 individuals with the potential to significantly reduce one's quality of life. The true incidence of this condition is not known because it often goes undiagnosed and/or recovers within a few days. ISSNHL is defined as a ≥30 dB loss of hearing over 3 consecutive audiometric octaves within 3 days with no known cause. The disorder is typically unilateral and most of the cases spontaneously recover to functional hearing within 30 days. High frequency losses, ageing, and vertigo are associated with a poorer prognosis. Multiple causes of ISSNHL have been postulated and the most common are vascular obstruction, viral infection, or labyrinthine membrane breaks. Corticosteroids are the standard treatment option but this practice is not without opposition. Post mortem analyses of temporal bones of ISSNHL cases have been inconclusive. This report analyzed ISSNHL studies administering corticosteroids that met strict inclusion criteria and identified a number of methodologic shortcomings that compromise the interpretation of results. We discuss the issues and conclude that the data do not support present treatment practices. The current status on ISSNHL calls for a multi-institutional, randomized, double-blind trial with validated outcome measures to provide science-based treatment guidance.
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