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Lee SY, Lee HS, Park MH. Transcriptomic analysis reveals prolonged neurodegeneration in the hippocampus of adult C57BL/6N mouse deafened by noise. Front Neurosci 2024; 18:1340854. [PMID: 38410162 PMCID: PMC10894918 DOI: 10.3389/fnins.2024.1340854] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2023] [Accepted: 01/25/2024] [Indexed: 02/28/2024] Open
Abstract
Introduction Several studies have reported a significant correlation between noise-induced hearing loss and cognitive decline. However, comprehensive analyses of this relationship are rare. This study aimed to assess the influence of hearing impairment on cognitive functions by analyzing organ samples in the afferent auditory pathway of deafened mice using mRNA sequencing. Methods We prepared 10 female 12-week-old C57BL/6N mice as the experimental and control groups in equal numbers. Mice in the experimental group were deafened with 120 dB sound pressure level (SPL) wideband noise for 2 h. Cochlea, auditory cortex, and hippocampus were obtained from all mice. After constructing cDNA libraries for the extracted RNA from the samples, we performed next-generation sequencing. Subsequently, we analyzed the results using gene ontologies (GOs) and Kyoto Encyclopedia of Genes and Genomes (KEGG) pathway databases for differentially expressed genes (DEGs) of each organ. Results Our results revealed 102, 89, and 176 DEGs for cochlea, auditory cortex, and hippocampus, respectively. We identified 294, 203, and 211 GOs; 10, 7, and 17 KEGG pathways in the cochlea, auditory cortex, and hippocampus, respectively. In the long term (12 weeks) from noise-induced hearing loss, GOs and KEGG pathways related to apoptosis or inflammation persisted more actively in the order of hippocampus, auditory cortex, and cochlea. Discussion This implies that the neurodegenerative effects of noise exposure persist more longer time in the central regions.
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Affiliation(s)
- Sang-Youp Lee
- Department of Otorhinolaryngology, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Ho Sun Lee
- Department of Otorhinolaryngology, Seoul National University College of Medicine, Seoul, Republic of Korea
- Department of Otorhinolaryngology, Boramae Medical Center, Seoul Metropolitan Government-Seoul National University, Seoul, Republic of Korea
| | - Min-Hyun Park
- Department of Otorhinolaryngology, Seoul National University College of Medicine, Seoul, Republic of Korea
- Department of Otorhinolaryngology, Boramae Medical Center, Seoul Metropolitan Government-Seoul National University, Seoul, Republic of Korea
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Liu P, Xue X, Zhang C, Zhou H, Ding Z, Wang L, Jiang Y, Shen W, Yang S, Wang F. Transcriptional Profile Changes after Noise-Induced Tinnitus in Rats. Brain Sci 2023; 13:brainsci13040573. [PMID: 37190538 DOI: 10.3390/brainsci13040573] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Revised: 03/20/2023] [Accepted: 03/21/2023] [Indexed: 03/31/2023] Open
Abstract
Tinnitus is an unpleasant symptom characterized by detective hearing without the actual sound input. Despite numerous studies elucidating a variety of pathomechanisms inducing tinnitus, the pathophysiology of tinnitus is not fully understood. The genes that are closely associated with this subtype of the auditory hallucination that could be utilized as potential treatment targets are still unknown. In this study, we explored the transcriptional profile changes of the auditory cortex after noise-induced tinnitus in rats using high throughput sequencing and verification of the detected genes using quantitative PCR (qPCR). Tinnitus models were established by analyzing startle behaviors through gap pre-pulse inhibition (PPI) of the acoustic startle. Two hundred and fifty-nine differential genes were identified, of which 162 genes were up-regulated and 97 genes were down-regulated. Analysis of the pathway enrichment indicated that the tinnitus group exhibited increased gene expression related to neurodegenerative disorders such as Huntington’s disease and Amyotrophic lateral sclerosis. Based on the identified genes, networks of protein–protein interaction were established and five hub genes were identified through degree rank, including Fos, Nr4a1, Nr4a3, Egr2, and Egr3. Therein, the Fos gene ranked first with the highest degree after noise exposure, and may be a potential target for the modulation of noise-induced tinnitus.
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Orekhova K, Centelleghe C, Di Guardo G, Graïc JM, Cozzi B, Trez D, Verin R, Mazzariol S. Systematic validation and assessment of immunohistochemical markers for central nervous system pathology in cetaceans, with emphasis on auditory pathways. PLoS One 2022; 17:e0269090. [PMID: 35648776 PMCID: PMC9159615 DOI: 10.1371/journal.pone.0269090] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2022] [Accepted: 05/14/2022] [Indexed: 12/23/2022] Open
Abstract
Cetacean neuropathology is a developing field that aims to assess structural and neurochemical changes involved in neurodegenerative, infectious and traumatic processes, however markers used previously in cetaceans have rarely undergone systematic validation. This is a prerequisite to investigating the potential damage inflicted on the cetacean auditory system by anthropogenic noise. In order to assess apoptotic, neuroinflammatory and structural aberrations on a protein level, the baseline expression of biomarker proteins has to be characterized, implementing a systematic approach to validate the use of anti-human and anti-laboratory animal antibodies in dolphin tissues. This approach was taken to study 12 different antibodies associated with hypoxic-ischemic, inflammatory, plastic and excitatory-inhibitory changes implicated in acoustic trauma within the ventral cochlear nuclei and inferior colliculi of 20 bottlenose dolphins (Tursiops truncatus). Out of the 12 tested antibodies, pro-apoptotic protease factor 1 (Apaf-1), diacylglycerolkinase-ζ (DGK-ζ), B-cell lymphoma related protein 2 (Bcl-2), amyloid-β peptide (Aβ) and neurofilament 200 (NF200) were validated employing Western blot analyses and immunohistochemistry (IHC). The results of the validation process indicate specific patterns of immunoreactivity that are comparable to those reported in other mammals, thus suggesting a key panel of IHC biomarkers of pathological processes in the cetacean brain. As a consequence, the antibodies tested in this study may constitute a valid tool for supporting existing diagnostic methods in neurological diseases. The approach of systematic validation of IHC markers in cetaceans is proposed as a standard practice, in order for results to be transparent, reliable and comparable.
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Affiliation(s)
- Ksenia Orekhova
- Department of Comparative Biomedicine and Food Science, University of Padova, Legnaro, Padova, Italy
- * E-mail:
| | - Cinzia Centelleghe
- Department of Comparative Biomedicine and Food Science, University of Padova, Legnaro, Padova, Italy
| | - Giovanni Di Guardo
- Faculty of Veterinary Medicine, University of Teramo, Località Piano d’Accio, Teramo, Italy
| | - Jean-Marie Graïc
- Department of Comparative Biomedicine and Food Science, University of Padova, Legnaro, Padova, Italy
| | - Bruno Cozzi
- Department of Comparative Biomedicine and Food Science, University of Padova, Legnaro, Padova, Italy
| | - Davide Trez
- Department of Comparative Biomedicine and Food Science, University of Padova, Legnaro, Padova, Italy
| | - Ranieri Verin
- Department of Comparative Biomedicine and Food Science, University of Padova, Legnaro, Padova, Italy
| | - Sandro Mazzariol
- Department of Comparative Biomedicine and Food Science, University of Padova, Legnaro, Padova, Italy
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Toxicopathological changes induced by combined exposure to noise and toluene in New Zealand White rabbits. Arh Hig Rada Toksikol 2022; 73:31-42. [PMID: 35390242 PMCID: PMC8999586 DOI: 10.2478/aiht-2022-73-3602] [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: 10/01/2021] [Accepted: 03/01/2022] [Indexed: 11/20/2022] Open
Abstract
Noise and toluene can have significant adverse effects on different systems in the human body, but little is known about their combination. The aim of this study was to see how their combined action reflects on serum levels of inflammatory cytokines tumour necrosis factor alpha (TNF-α) and interleukin 1 beta (IL-1β), body weight, and pathological changes in the heart, lung, stomach, and spleen tissues. To do that we exposed New Zealand rabbits to 1000 mg/L toluene and 100 dB of white noise in a chamber specifically designed for the purpose over two consecutive weeks. Serum levels of TNF-α and IL-1β were measured with the enzyme-linked immunosorbent assay (ELISA), whereas Bax and Bcl-2 expressions in tissues were determined with real-time polymerase chain reaction (PCR). Noise and toluene changed TNF-α and IL-1β serum levels on different days following the end of exposure and significantly increased the Bax/Bcl-2 ratio in the lung and spleen. In addition, they induced different pathological changes in the heart, lung, spleen, and stomach tissues. This study has confirmed that exposure to noise and toluene can induce a range of toxicopathological changes, probably by inducing inflammatory pathways and apoptosis, but their combined effects look weaker than those of its components, although histopathological findings suggest the opposite.
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Gröschel M, Voigt S, Schwitzer S, Ernst A, Basta D. Cytomegalovirus Seropositivity as a Potential Risk Factor for Increased Noise Trauma Susceptibility. Noise Health 2022; 24:1-6. [PMID: 35645133 PMCID: PMC9239143 DOI: 10.4103/nah.nah_4_21] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
CONTEXT Cytomegalovirus (CMV) represents the leading congenital viral infection in humans. Although congenital CMV due to vertically transmitted infections is the main cause of CMV-related diseases, adult CMV infections might still be of clinical significance. It is still discussed how far CMV seropositivity, due to horizontal infection in immunocompetent adults, is able to induce significant dysfunction. The present study investigates in how far CMV seropositivity is an additional risk factor for an increasing susceptibility to sensorineural hearing loss induced by acoustic injury during adulthood in a guinea pig CMV (GPCMV) model of noise-induced hearing loss (NIHL). METHODS Two groups (GPCMV seropositive vs. seronegative) of normal hearing adult guinea pigs were exposed to a broadband noise (5-20 kHz) for 2 hours at 115 dB sound pressure level. Frequency-specific auditory brainstem response recordings for determination of auditory threshold shift were carried out and the number of missing outer hair cells was counted 2 weeks after the noise exposure. RESULTS The data show a slightly increased shift in auditory thresholds in seropositive animals compared to the seronegative control group in response to noise trauma. However, the observed difference was significant at least at high frequencies. The differences in threshold shift are not correlated with outer hair cell loss between the experimental groups. CONCLUSION The results point to potential additional pathologies in a guinea pig NIHL model in correlation to GPCMV seropositivity, which should be taken into account when assessing risks of latent/reactivated CMV infection. Due to the relatively slight effect in the present data, the aim of future studies should be a more detailed consideration (e.g., larger sample size) and to localize possible target structures as well as the significance of the infection route.
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Affiliation(s)
- Moritz Gröschel
- Department of Otolaryngology at UKB, University of Berlin, Charité Medical School, Berlin, Germany,Address for correspondence: Dr Moritz Gröschel, Department of Otolaryngology, Unfallkrankenhaus Berlin, Warener Str 7, 12683 Berlin, Germany. E-mail:
| | - Stefan Voigt
- Department of Otolaryngology at UKB, University of Berlin, Charité Medical School, Berlin, Germany
| | - Susanne Schwitzer
- Department of Otolaryngology at UKB, University of Berlin, Charité Medical School, Berlin, Germany
| | - Arne Ernst
- Department of Otolaryngology at UKB, University of Berlin, Charité Medical School, Berlin, Germany
| | - Dietmar Basta
- Department of Otolaryngology at UKB, University of Berlin, Charité Medical School, Berlin, Germany
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Arun P, Rossetti F, Wilder DM, Wang Y, Gist ID, Long JB. Blast Exposure Causes Long-Term Degeneration of Neuronal Cytoskeletal Elements in the Cochlear Nucleus: A Potential Mechanism for Chronic Auditory Dysfunctions. Front Neurol 2021; 12:652190. [PMID: 33841318 PMCID: PMC8027061 DOI: 10.3389/fneur.2021.652190] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2021] [Accepted: 02/15/2021] [Indexed: 11/13/2022] Open
Abstract
Blast-induced auditory dysfunctions including tinnitus are the most prevalent disabilities in service members returning from recent combat operations. Most of the previous studies were focused on the effect of blast exposure on the peripheral auditory system and not much on the central auditory signal-processing regions in the brain. In the current study, we have exposed rats to single and tightly coupled repeated blasts and examined the degeneration of neuronal cytoskeletal elements using silver staining in the central auditory signal-processing regions in the brain at 24 h, 14 days, 1 month, 6 months, and 1 year. The brain regions evaluated include cochlear nucleus, lateral lemniscus, inferior colliculus, medial geniculate nucleus, and auditory cortex. The results obtained indicated that a significant increase in degeneration of neuronal cytoskeletal elements was observed only in the left and right cochlear nucleus. A significant increase in degeneration of neuronal cytoskeletal elements was observed in the cochlear nucleus at 24 h and persisted through 1 year, suggesting acute and chronic neuronal degeneration after blast exposure. No statistically significant differences were observed between single and repeated blasts. The localized degeneration of neuronal cytoskeletal elements in the cochlear nucleus suggests that the damage could be caused by transmission of blast shockwaves/noise through the ear canal and that use of suitable ear protection devices can protect against acute and chronic central auditory signal processing defects including tinnitus after blast exposure.
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Affiliation(s)
- Peethambaran Arun
- Blast-Induced Neurotrauma Branch, Center for Military Psychiatry and Neuroscience, Walter Reed Army Institute of Research, Silver Spring, MD, United States
| | - Franco Rossetti
- Blast-Induced Neurotrauma Branch, Center for Military Psychiatry and Neuroscience, Walter Reed Army Institute of Research, Silver Spring, MD, United States
| | - Donna M Wilder
- Blast-Induced Neurotrauma Branch, Center for Military Psychiatry and Neuroscience, Walter Reed Army Institute of Research, Silver Spring, MD, United States
| | - Ying Wang
- Blast-Induced Neurotrauma Branch, Center for Military Psychiatry and Neuroscience, Walter Reed Army Institute of Research, Silver Spring, MD, United States
| | - Irene D Gist
- Blast-Induced Neurotrauma Branch, Center for Military Psychiatry and Neuroscience, Walter Reed Army Institute of Research, Silver Spring, MD, United States
| | - Joseph B Long
- Blast-Induced Neurotrauma Branch, Center for Military Psychiatry and Neuroscience, Walter Reed Army Institute of Research, Silver Spring, MD, United States
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Ruel J, Guitton MJ, Gratias P, Lenoir M, Shen S, Puel JL, Brabet P, Wang J. Endogenous Pituitary Adenylate Cyclase-Activating Polypeptide (PACAP) Plays a Protective Effect Against Noise-Induced Hearing Loss. Front Cell Neurosci 2021; 15:658990. [PMID: 33828461 PMCID: PMC8019930 DOI: 10.3389/fncel.2021.658990] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Accepted: 03/02/2021] [Indexed: 01/07/2023] Open
Abstract
Pituitary adenylyl cyclase-activating polypeptide (PACAP) is a member of the vasoactive intestinal polypeptide (VIP)-the secretin-glucagon family of neuropeptides. They act through two classes of receptors: PACAP type 1 (PAC1) and type 2 (VPAC1 and VPAC2). Among their pleiotropic effects throughout the body, PACAP functions as neuromodulators and neuroprotectors, rescuing neurons from apoptosis, mostly through the PAC1 receptor. To explore the potential protective effect of endogenous PACAP against Noise-induced hearing loss (NIHL), we used a knockout mouse model lacking PAC1 receptor expression (PACR1−/−) and a transgenic humanized mouse model expressing the human PAC1 receptor (TgHPAC1R). Based on complementary approaches combining electrophysiological, histochemical, and molecular biological evaluations, we show PAC1R expression in spiral ganglion neurons and in cochlear apical cells of the organ of Corti. Wild-type (WT), PAC1R−/−, and TgHPAC1R mice exhibit similar auditory thresholds. For most of the frequencies tested after acute noise damage, however, PAC1R−/− mice showed a larger elevation of the auditory threshold than did their WT counterparts. By contrast, in a transgene copy number-dependent fashion, TgHPAC1R mice showed smaller noise-induced elevations of auditory thresholds compared to their WT counterparts. Together, these findings suggest that PACAP could be a candidate for endogenous protection against noise-induced hearing loss.
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Affiliation(s)
- Jérôme Ruel
- Institute for Neurosciences of Montpellier (INM), University Montpellier, INSERM, Montpellier, France.,Laboratoire de Neurosciences Cognitives, UMR7291 CNRS, Aix-Marseille Université, Marseille, France
| | - Matthieu J Guitton
- CERVO Brain Research Center, Faculty of Medicine, Laval University, Quebec City, QC, Canada
| | - Paul Gratias
- Institute for Neurosciences of Montpellier (INM), University Montpellier, INSERM, Montpellier, France
| | - Marc Lenoir
- Institute for Neurosciences of Montpellier (INM), University Montpellier, INSERM, Montpellier, France
| | - Sanbing Shen
- Regenerative Medicine Institute, National University of Ireland (NUI), Galway, Ireland
| | - Jean-Luc Puel
- Institute for Neurosciences of Montpellier (INM), University Montpellier, INSERM, Montpellier, France
| | - Philippe Brabet
- Institute for Neurosciences of Montpellier (INM), University Montpellier, INSERM, Montpellier, France
| | - Jing Wang
- Institute for Neurosciences of Montpellier (INM), University Montpellier, INSERM, Montpellier, France
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Neuroanatomical changes of the medial prefrontal cortex of male pups of Wistar rat after prenatal and postnatal noise stress. Acta Histochem 2020; 122:151589. [PMID: 32778245 DOI: 10.1016/j.acthis.2020.151589] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 06/27/2020] [Accepted: 06/28/2020] [Indexed: 12/11/2022]
Abstract
Recent evidences showed that, noise stress causes abnormal changes in structure and function of central nervous system (CNS). The Current study was conducted to evaluate some stereological parameters of the medial prefrontal cortex (mPFC) of male pups of Wistar rat after prenatal and early postnatal noise stress. 18 pregnant Wistar rats were randomly divided into prenatal noise-exposed (NE) group, postnatal NE group, and controls. Male pups of NE groups were exposed to noise 100 dB at the frequency ranges of 500-8000 Hz, 4 h per day from gestational day one (GD1) to GD21 for the prenatal NE group, and from postnatal day one (PND1) to PND21 in the postnatal NE group. The Control group animals were maintained under standard condition without noise stimulation. Corticosterone level in plasma was measured using ELISA technique. Changes of the neurons and non-neurons cells number and volume of the mPFC were evaluated by stereological analysis. Tunnel assay was also used for detection of apoptotic cells. Increase in plasma corticosterone level, decrease in the number of neurons, and increase in the apoptotic cells number were observed in both NE groups. Decrease in volume of mPFC and also in non-neurons cells number was observed in the prenatal NE group. An increase in the non-neurons number was seen in the postnatal NE group. Data of the current comparative study showed that, noise stress during prenatal and early postnatal periods can induce the abnormal alteration in some stereological parameters of mPFC in male pups of Wistar rat. These negative alterations were more remarkable after prenatal noise stress.
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Rodrigues JC, Bachi ALL, Silva GAV, Rossi M, do Amaral JB, Lezirovitz K, de Brito R. New Insights on the Effect of TNF Alpha Blockade by Gene Silencing in Noise-Induced Hearing Loss. Int J Mol Sci 2020; 21:ijms21082692. [PMID: 32294929 PMCID: PMC7215896 DOI: 10.3390/ijms21082692] [Citation(s) in RCA: 6] [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: 02/28/2020] [Revised: 04/06/2020] [Accepted: 04/10/2020] [Indexed: 02/07/2023] Open
Abstract
Noise exposure represents the second most common cause of acquired sensorineural hearing loss and we observed that tumor necrosis factor α (TNFα) was involved in this context. The effect of Tnfα gene silencing on the expression profile related to the TNFα metabolic pathway in an experimental model of noise-induced hearing loss had not previously been studied. Methods: Single ears of Wistar rats were pretreated with Tnfα small interfering RNA (siRNA) by trans-tympanic administration 24 h before they were exposed to white noise (120 dBSPL for three hours). After 24 h of noise exposure, we analyzed the electrophysiological threshold and the amplitude of waves I, II, III, and IV in the auditory brain response click. In addition, qRT-PCR was performed to evaluate the TNFα metabolic pathway in the ears submitted or not to gene silencing. Results: Preservation of the electrophysiological threshold and the amplitude of waves was observed in the ears submitted to gene silencing compared to the ears not treated. Increased anti-apoptotic gene expression and decreased pro-apoptotic gene expression were found in the treated ears. Conclusion: Our results allow us to suggest that the blockade of TNFα by gene silencing was useful to prevent noise-induced hearing loss.
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Affiliation(s)
- Janaína C. Rodrigues
- Clinical Hospital, Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, University of São Paulo (USP), São Paulo 05403-000, Brazil; (K.L.); (R.d.B.)
- Laboratory of Otolaryngology (LIM32), School of Medicine, University of São Paulo (USP), São Paulo 05403-000, Brazil;
- Correspondence:
| | - André L. L. Bachi
- ENT Research Lab. Department of Otorhinolaryngology-Head and Neck Surgery, Federal University of São Paulo. (UNIFESP), São Paulo-SP 04039-032, Brazil; (A.L.L.B.); (M.R.); (J.B.d.A.)
- Brazilian Institute of Teaching and Research in Pulmonary and Exercise Immunology (IBEPIPE), São José dos Campos 12245-520, Brazil
- Post-graduation Program in Health Sciences, Santo Amaro University (UNISA), São Paulo 04829-300, Brazil
| | - Gleiciele A. V. Silva
- Laboratory of Otolaryngology (LIM32), School of Medicine, University of São Paulo (USP), São Paulo 05403-000, Brazil;
| | - Marcelo Rossi
- ENT Research Lab. Department of Otorhinolaryngology-Head and Neck Surgery, Federal University of São Paulo. (UNIFESP), São Paulo-SP 04039-032, Brazil; (A.L.L.B.); (M.R.); (J.B.d.A.)
| | - Jonatas B. do Amaral
- ENT Research Lab. Department of Otorhinolaryngology-Head and Neck Surgery, Federal University of São Paulo. (UNIFESP), São Paulo-SP 04039-032, Brazil; (A.L.L.B.); (M.R.); (J.B.d.A.)
| | - Karina Lezirovitz
- Clinical Hospital, Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, University of São Paulo (USP), São Paulo 05403-000, Brazil; (K.L.); (R.d.B.)
- Laboratory of Otolaryngology (LIM32), School of Medicine, University of São Paulo (USP), São Paulo 05403-000, Brazil;
| | - Rubens de Brito
- Clinical Hospital, Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, University of São Paulo (USP), São Paulo 05403-000, Brazil; (K.L.); (R.d.B.)
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Manohar S, Russo FY, Seigel GM, Salvi R. Dynamic Changes in Synaptic Plasticity Genes in Ipsilateral and Contralateral Inferior Colliculus Following Unilateral Noise-induced Hearing Loss. Neuroscience 2020; 436:136-153. [PMID: 32278721 DOI: 10.1016/j.neuroscience.2020.04.010] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2020] [Revised: 03/07/2020] [Accepted: 04/03/2020] [Indexed: 12/27/2022]
Abstract
Unilateral noise-induced hearing loss reduces the input to the central auditory pathway disrupting the excitatory and inhibitory inputs to the inferior colliculus (IC), an important binaural processing center. Little is known about the compensatory synaptic changes that occur in the IC as a consequence of unilateral noise-induced hearing loss. To address this issue, Sprague-Dawley rats underwent unilateral noise exposure resulting in severe unilateral hearing loss. IC tissues from the contralateral and ipsilateral IC were evaluated for acute (2-d) and chronic (28-d) changes in the expression of 84 synaptic plasticity genes on a PCR array. Arc and Egr1 genes were further visualized by in situ hybridization to validate the PCR results. None of the genes were upregulated, but many were downregulated post-exposure. At 2-d post-exposure, more than 75% of the genes were significantly downregulated in the contralateral IC, while only two were downregulated in the ipsilateral IC. Many of the downregulated genes were related to long-term depression, long-term potentiation, cell adhesion, immediate early genes, neural receptors and postsynaptic density. At 28-d post-exposure, the gene expression pattern was reversed with more than 85% of genes in the ipsilateral IC now downregulated. Most genes previously downregulated in the contralateral IC 2-d post-exposure had recovered; less than 15% remained downregulated. These time-dependent, asymmetric changes in synaptic plasticity gene expression could shed new light on the perceptual deficits associated with unilateral hearing loss and the dynamic structural and functional changes that occur in the IC days and months following unilateral noise-induced hearing loss.
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Affiliation(s)
| | | | - Gail M Seigel
- Center for Hearing and Deafness, University at Buffalo, Buffalo, NY 14214, USA
| | - Richard Salvi
- Center for Hearing and Deafness, University at Buffalo, Buffalo, NY 14214, USA.
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Chang M, Kim HJ, Mook-Jung I, Oh SH. Hearing loss as a risk factor for cognitive impairment and loss of synapses in the hippocampus. Behav Brain Res 2019; 372:112069. [DOI: 10.1016/j.bbr.2019.112069] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2019] [Revised: 06/09/2019] [Accepted: 07/01/2019] [Indexed: 11/17/2022]
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Meng X, Gu Z, Xie X, Su Y, Zhang X, Ma H, Guo Y, Liu X, Cheng Y, Chang Y, Bao J. Acid sphingomyelinase mediates the noise-induced liver disorder in mice. Clin Exp Pharmacol Physiol 2019; 46:556-566. [PMID: 30854677 DOI: 10.1111/1440-1681.13083] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Revised: 02/27/2019] [Accepted: 03/06/2019] [Indexed: 12/19/2022]
Abstract
Noise-induced structural and functional disorder of the liver has been realized, but the underlying mechanism remains to be characterized, which has limited the introduction of precautious measures. Over-activation of acid sphingomyelinase (ASM)/ceramide (Cer) pathway takes centre stage in hepatocyte injury entailed by various stimulus. We aimed to investigate whether it mediated the noise elicited liver disorder on infrastructure, lipid metabolism, apoptosis, and oxidative stress. Mice were exposed to broad band noise (20-20k Hz, 90-110 dB) for 1, 3, 5 or 7 days by 3 hr/d. Doxepin hydrochloride (DOX), an ASM inhibitor was given by 5 mg/kg/d gavage. We showed that 5 or 7 days intense, broad band noise exposure caused significant infrastructure derangement and lipid droplets storage in hepatocytes. The content of cholesterol, free fatty acids or triglyceride was increased significantly in liver tissue upon noise stimulation. Moreover, the noise promoted apoptosis and superoxide generation in hepatocytes significantly, enhancing activity of aspartate aminotransferase (AST) or alanine amino transferase (ALT) in serum. Acid sphingomyelinase activity and Cer generation in liver tissue were elevated by noise exposure, which was normalized with DOX administrated. Accordingly, DOX alleviated steatosis, apoptosis, oxidative stress and enzymatic change in hepatocytes or serum of noise exposed mice substantially. In summary, our results suggest the ASM/Cer pathway contributes to the broad band noise elicited liver damage in mice.
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Affiliation(s)
- Xingxing Meng
- Department of Aerospace Hygiene, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Zhenghui Gu
- Department of Aerospace Hygiene, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Xiaoping Xie
- Department of Aerospace Hygiene, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Yuting Su
- Department of Aerospace Hygiene, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Xi Zhang
- Department of Aerospace Hygiene, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Hongzhe Ma
- Department of Aerospace Hygiene, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Yibin Guo
- Department of Aerospace Hygiene, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Xincheng Liu
- Department of Aerospace Hygiene, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Yaoping Cheng
- Department of Aerospace Hygiene, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Yaoming Chang
- Department of Aerospace Hygiene, Fourth Military Medical University, Xi'an, Shaanxi, China
| | - Junxiang Bao
- Department of Aerospace Hygiene, Fourth Military Medical University, Xi'an, Shaanxi, China
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Colbeth HL, Zeig‐Owens R, Liu Y, Webber MP, Schwartz TM, Hall CB, Prezant DJ. Persistent self-reported ear and hearing problems among World Trade Center-exposed firefighters and emergency medical service workers, 2001-2017-A longitudinal cohort analysis. Am J Ind Med 2019; 62:43-49. [PMID: 30523633 DOI: 10.1002/ajim.22925] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 11/06/2018] [Indexed: 01/12/2023]
Abstract
BACKGROUND The goal of this study was to estimate the impact of exposure to the World Trade Center (WTC) site on annual and persistent rates of otalgia and hearing impairment among Fire Department of the City of New York (FDNY) Firefighters and Emergency Medical Service Workers (EMS). METHODS Responders completed routine physical health questionnaires at monitoring visits. We used logistic and marginal logistic regression models to explore the association between otalgia and hearing impairment and WTC arrival time. RESULTS The highest-exposed group had greater odds of persistent ear symptoms (OR 1.33, 95%CI 1.11-1.59) compared with the least-exposed; the odds of persistent hearing problems between the groups were not significantly different. We found consistent WTC-exposure gradients when the average population odds of these outcomes were assessed each year. CONCLUSIONS Our findings demonstrate that the odds of long-term ear symptoms were significantly associated with the intensity of WTC exposure.
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Affiliation(s)
- Hilary L. Colbeth
- Fire Department of the City of New YorkBureau of Health ServicesBrooklynNew York
- Pulmonology Division, Department of MedicineMontefiore Medical CenterBronxNew York
| | - Rachel Zeig‐Owens
- Fire Department of the City of New YorkBureau of Health ServicesBrooklynNew York
- Pulmonology Division, Department of MedicineMontefiore Medical CenterBronxNew York
- Department of Epidemiology and Population HealthAlbert Einstein College of MedicineBronxNew York
| | - Yang Liu
- Fire Department of the City of New YorkBureau of Health ServicesBrooklynNew York
- Pulmonology Division, Department of MedicineMontefiore Medical CenterBronxNew York
| | - Mayris P. Webber
- Fire Department of the City of New YorkBureau of Health ServicesBrooklynNew York
- Department of Epidemiology and Population HealthAlbert Einstein College of MedicineBronxNew York
- Department of Epidemiology and Population HealthMontefiore Medical CenterBronxNew York
| | - Theresa M. Schwartz
- Fire Department of the City of New YorkBureau of Health ServicesBrooklynNew York
- Pulmonology Division, Department of MedicineMontefiore Medical CenterBronxNew York
| | - Charles B. Hall
- Department of Epidemiology and Population HealthAlbert Einstein College of MedicineBronxNew York
| | - David J. Prezant
- Fire Department of the City of New YorkBureau of Health ServicesBrooklynNew York
- Pulmonology Division, Department of MedicineAlbert Einstein College of MedicineBronxNew York
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