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Sarı E, Nteli Chatzioglou G, Temirbekov D, Aliyeva A, Öztürk A, Gürses IA. The variations of osseous structure of the ınternal acoustic canal: an anatomical study. Braz J Otorhinolaryngol 2024; 90:101414. [PMID: 38492307 PMCID: PMC10955313 DOI: 10.1016/j.bjorl.2024.101414] [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: 12/12/2023] [Accepted: 02/10/2024] [Indexed: 03/18/2024] Open
Abstract
OBJECTIVES The internal acoustic meatus is an osseous canal that connects the inner ear to the posterior cranial fossa. It is located in the petrous portion of the temporal bone. A thin cribriform osseous plate known as the fundus is situated at the lateral end of the canal. This study assesses the structural and numerical variations of the fundus formations. METHODS Fifty-four temporal bones of unknown gender and age were examined with the surgical microscope. RESULTS The temporal bones analyzed were 46.2% right-sided and 53.7% left-sided. Only one temporal bone had two parallel transverse crests, while three had a single anterior crest that split into two branches posteriorly. The number of foramina at the transverse crest varied, with 29.6% having none, 48.1% having a single foramen, and 22.2% having several foramina. An anterior crest structure was seen in 53.7% of the temporal bones, with 5% having a slightly constricted entry to the facial canal. In cases with a single nerve foramen, 48.1% had one, while 51.8% had more than one, including examples with three or four foramina. A crest was found between the foramina of the single nerve in 7% of patients. Furthermore, a crest between the saccular nerve foramen and the high fiber foramina was seen in 25.9% of cases, and 5% had two saccular nerve foramina. CONCLUSION We think that revealing the anatomical, structural and numerical variations in the fundus will be useful in explaining the disease-symptom relationship. LEVEL OF EVIDENCE Level 4.
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Affiliation(s)
- Elif Sarı
- Istanbul Aydin University, Faculty of Medicine, Department of Otorhinolaryngology, Istanbul, Turkey.
| | - Gkionoul Nteli Chatzioglou
- Istanbul Health and Technology University, Faculty of Medicine, Department of Anatomy, Istanbul, Turkey; Istanbul University, Faculty of Medicine, Department of Anatomy, Istanbul, Turkey
| | - Dastan Temirbekov
- Istanbul Aydin University, Faculty of Medicine, Department of Otorhinolaryngology, Istanbul, Turkey
| | - Aynur Aliyeva
- The Cincinnati Children's Hospital Medical Center, The Division of the Otolaryngology, Ohio, USA
| | - Adnan Öztürk
- Istanbul Health and Technology University, Faculty of Medicine, Department of Anatomy, Istanbul, Turkey; Istanbul University, Faculty of Medicine, Department of Anatomy, Istanbul, Turkey
| | - Ilke Ali Gürses
- Koc University, Faculty of Medicine, Department of Anatomy, Istanbul, Turkey
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Lai H, Gao M, Yang H. The potassium channels: Neurobiology and pharmacology of tinnitus. J Neurosci Res 2024; 102:e25281. [PMID: 38284861 DOI: 10.1002/jnr.25281] [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: 04/23/2023] [Revised: 10/27/2023] [Accepted: 11/16/2023] [Indexed: 01/30/2024]
Abstract
Tinnitus is a widespread public health issue that imposes a significant social burden. The occurrence and maintenance of tinnitus have been shown to be associated with abnormal neuronal activity in the auditory pathway. Based on this view, neurobiological and pharmacological developments in tinnitus focus on ion channels and synaptic neurotransmitter receptors in neurons in the auditory pathway. With major breakthroughs in the pathophysiology and research methodology of tinnitus in recent years, the role of the largest family of ion channels, potassium ion channels, in modulating the excitability of neurons involved in tinnitus has been increasingly demonstrated. More and more potassium channels involved in the neural mechanism of tinnitus have been discovered, and corresponding drugs have been developed. In this article, we review animal (mouse, rat, hamster, and guinea-pig), human, and genetic studies on the different potassium channels involved in tinnitus, analyze the limitations of current clinical research on potassium channels, and propose future prospects. The aim of this review is to promote the understanding of the role of potassium ion channels in tinnitus and to advance the development of drugs targeting potassium ion channels for tinnitus.
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Affiliation(s)
- Haohong Lai
- Department of Otolaryngology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
| | - Minqian Gao
- Department of Otolaryngology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
- Department of Hearing and Speech-Language Science, Guangzhou Xinhua University, Guangzhou, China
| | - Haidi Yang
- Department of Otolaryngology, Sun Yat-sen Memorial Hospital, Sun Yat-sen University, Guangzhou, China
- Department of Hearing and Speech-Language Science, Guangzhou Xinhua University, Guangzhou, China
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Wu Z, Zhu Z, Cao J, Wu W, Hu S, Deng C, Xie Q, Huang X, You C. Prediction of network pharmacology and molecular docking-based strategy to determine potential pharmacological mechanism of Liuwei Dihuang pill against tinnitus. Medicine (Baltimore) 2022; 101:e31711. [PMID: 36401375 PMCID: PMC9678611 DOI: 10.1097/md.0000000000031711] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/03/2022] Open
Abstract
BACKGROUND Liuwei Dihuang Pill is widely used to treat tinnitus in China. However, the underlying mechanism of Liuwei Dihuang Pill in treating tinnitus still remains unclear. OBJECTIVE To explore the potential pharmacological mechanism of Liuwei Dihuang Pill in the treatment of tinnitus based on network pharmacology and molecular docking. METHODS The active components of the Liuwei Dihuang Pill were obtained from the traditional Chinese medicine systems pharmacology database and analysis platform (TCMSP) database. Cytoscape software was used to draw the active component-target network diagram of Liuwei Dihuang Pill, and obtain the core components. Then the corresponding targets were also obtained from the TCMSP database. Targets related to tinnitus were obtained from the GeneCards, DisGeNET, TTD and DrugBank databases. The String database was used to construct protein-protein interaction (PPI) network of common targets of drugs and diseases, then the core targets were screened out. The Annotation, Visualization and Integrated Discovery (DAVID) database was used for gene ontology (GO) enrichment and Kyoto encyclopedia of genes and genomes (KEGG) pathway analysis of common targets. Finally, the molecular docking between the core component and the core target was carried out by AutoDock. RESULTS The core components of Liuwei Dihuang Pill in the treatment of tinnitus including quercetin, stigmasterol, kaempferol, β-sitosterol, tetrahydroalstonine, which may act on core targets such as STAT3, transcription factor AP-1 (JUN), tumor necrosis factor (TNF), interleukin-6 and MAPK3. HIF-1 signaling pathway, Influenza A, P53 signaling pathway, and Toll-like receptor signaling pathway play a role in anti-inflammatory, improving microcirculation in the blood-labyrinth barrier, increasing cochlear blood flow, and preventing hair cell damage. The molecular docking results showed that the affinity between core components and core targets was good. CONCLUSION The potential mechanism of Liuwei Dihuang Pill in the treatment of tinnitus was preliminarily discussed in this study, which may provide a theoretical basis and evidence for further experimental research.
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Affiliation(s)
- Zhongbiao Wu
- Jiangxi Hospital of Integrated Traditional Chinese and Western Medicine, Nanchang, Jiangxi, China
| | - Zhongyan Zhu
- Jiangxi Hospital of Integrated Traditional Chinese and Western Medicine, Nanchang, Jiangxi, China
| | - Jian Cao
- Jiangxi Hospital of Integrated Traditional Chinese and Western Medicine, Nanchang, Jiangxi, China
| | - Weikun Wu
- Jiangxi Hospital of Integrated Traditional Chinese and Western Medicine, Nanchang, Jiangxi, China
- *Correspondence: Weikun Wu, Jiangxi Hospital of Integrated Traditional Chinese and Western Medicine, Nanchang, Jiangxi 330003, China (e-mail: )
| | - Shiping Hu
- Jiangxi Hospital of Integrated Traditional Chinese and Western Medicine, Nanchang, Jiangxi, China
| | - Chengcheng Deng
- Affiliated Hospital of Jiangxi University of Traditional Chinese Medicine, Nanchang, Jiangxi, China
| | - Qiang Xie
- Affiliated Hospital of Jiangxi University of Traditional Chinese Medicine, Nanchang, Jiangxi, China
| | - Xinmei Huang
- Jiangxi University of Traditional Chinese Medicine, Nanchang, Jiangxi, China
| | - Chengkun You
- Pinghu Hospital of Traditional Chinese Medicine, Jiaxing, Zhejiang, China
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Mazurek B, Hesse G, Sattel H, Kratzsch V, Lahmann C, Dobel C. S3 Guideline: Chronic Tinnitus : German Society for Otorhinolaryngology, Head and Neck Surgery e. V. (DGHNO-KHC). HNO 2022; 70:795-827. [PMID: 36227338 PMCID: PMC9581878 DOI: 10.1007/s00106-022-01207-4] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/20/2022] [Indexed: 11/16/2022]
Affiliation(s)
- Birgit Mazurek
- Tinnituszentrum, Charité - Universitätsmedizin Berlin, Charitéplatz 1, 10117, Berlin, Germany.
| | - Gerhard Hesse
- Tinnitus-Klinik, KH Bad Arolsen, Große Allee 50, 34454, Bad Arolsen, Germany.
- Universität Witten/Herdecke, Witten, Germany.
| | - Heribert Sattel
- Klinikum rechts der Isar, Klinik und Poliklinik für Psychosomatische Medizin und Psychotherapie, Technical University of Munich, Langerstr. 3, 81675, Munich, Germany
| | - Volker Kratzsch
- Abt. Hörbehinderung, Tinnitus und Schwindelerkrankungen, VAMED Rehaklinik Bad Grönenbach, Sebastian-Kneipp-Allee 3-5, 87730, Bad Grönenbach, Germany
| | - Claas Lahmann
- Klinik für Psychosomatische Medizin und Psychotherapie, Universitätsklinikum Freiburg, Hauptstr. 8, 79104, Freiburg, Germany
| | - Christian Dobel
- Klinik für Hals-, Nasen- und Ohrenheilkunde, Universitätsklinikum Jena, Am Klinikum 1, 07747, Jena, Germany
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Keilty D, Khandwala M, Liu ZA, Papaioannou V, Bouffet E, Hodgson D, Yee R, Cushing S, Laperriere N, Ahmed S, Mabbott D, Ramaswamy V, Tabori U, Huang A, Bartels U, Tsang DS. Hearing Loss After Radiation and Chemotherapy for CNS and Head-and-Neck Tumors in Children. J Clin Oncol 2021; 39:3813-3821. [PMID: 34570616 DOI: 10.1200/jco.21.00899] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
PURPOSE Hearing loss (HL) is a serious secondary effect of treatment for CNS and head-and-neck tumors in children. The goal of this study was to evaluate incidence and risk factors for HL in patients with multiple ototoxic exposures. PATIENTS AND METHODS We evaluated 340 ears from 171 patients with CNS or head-and-neck tumors treated with radiation, with or without chemotherapy, who had longitudinal audiologic evaluation. International Society of Pediatric Oncology-Boston grades were assigned to 2,420 hearing assessments. Multivariable weighted ordinal logistic regression was fitted to evaluate the effect of clinicopathologic features on HL. RESULTS Mean cochlea dose (odds ratio [OR] 1.04 per Gy, P < .001), time since radiotherapy (RT; OR 1.21 per year, P < .001), cisplatin dose (OR 1.48 per 100 mg/m2, P < .001), and carboplatin dose (OR 1.41 per 1,000 mg/m2, P = .002) were associated with increasing International Society of Pediatric Oncology-Boston grade of HL. There was no synergistic effect of RT and cisplatin (interaction term, P = .53) or RT and carboplatin (interaction term, P = .85). Cumulative incidence of high-frequency HL (> 4 kHz) was 50% or greater at 5 years after RT if mean cochlea dose was > 30 Gy, while incidence of HL across all frequencies continued to increase beyond 5 years after RT. CONCLUSION Children treated with radiation and chemotherapy experience a high incidence of HL over time, with associations found between more severe HL and cisplatin or carboplatin dose as well as mean cochlea dose. Mean cochlea dose of ≤ 30 Gy is proposed as a goal to reduce the risk of HL; a lower threshold (20-25 Gy) may be considered in patients receiving platinum chemotherapy to reduce cumulative HL burden.
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Affiliation(s)
- Dana Keilty
- Radiation Medicine Program, Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - Mohammad Khandwala
- Radiation Medicine Program, Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - Zhihui Amy Liu
- Department of Biostatistics, Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - Vicky Papaioannou
- Department of Communication Disorders, Hospital for Sick Children, Toronto, ON, Canada
| | - Eric Bouffet
- Division of Haematology/Oncology, Hospital for Sick Children, Toronto, ON, Canada
| | - David Hodgson
- Radiation Medicine Program, Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - Ryan Yee
- Radiation Medicine Program, Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - Sharon Cushing
- Department of Otolaryngology-Head and Neck Surgery, Hospital for Sick Children, Toronto, ON, Canada
| | - Normand Laperriere
- Radiation Medicine Program, Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - Sameera Ahmed
- Radiation Medicine Program, Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
| | - Donald Mabbott
- Department of Psychology, Hospital for Sick Children, Toronto, ON, Canada
| | - Vijay Ramaswamy
- Division of Haematology/Oncology, Hospital for Sick Children, Toronto, ON, Canada
| | - Uri Tabori
- Division of Haematology/Oncology, Hospital for Sick Children, Toronto, ON, Canada
| | - Annie Huang
- Division of Haematology/Oncology, Hospital for Sick Children, Toronto, ON, Canada
| | - Ute Bartels
- Division of Haematology/Oncology, Hospital for Sick Children, Toronto, ON, Canada
| | - Derek S Tsang
- Radiation Medicine Program, Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada
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Le N, Hufford TM, Park JS, Brewster RM. Differential expression and hypoxia-mediated regulation of the N-myc downstream regulated gene family. FASEB J 2021; 35:e21961. [PMID: 34665878 PMCID: PMC8573611 DOI: 10.1096/fj.202100443r] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2021] [Revised: 09/11/2021] [Accepted: 09/15/2021] [Indexed: 01/09/2023]
Abstract
Many organisms rely on oxygen to generate cellular energy (adenosine triphosphate or ATP). During severe hypoxia, the production of ATP decreases, leading to cell damage or death. Conversely, excessive oxygen causes oxidative stress that is equally damaging to cells. To mitigate pathological outcomes, organisms have evolved mechanisms to adapt to fluctuations in oxygen levels. Zebrafish embryos are remarkably hypoxia-tolerant, surviving anoxia (zero oxygen) for hours in a hypometabolic, energy-conserving state. To begin to unravel underlying mechanisms, we analyze here the distribution of the N-myc Downstream Regulated Gene (ndrg) family, ndrg1-4, and their transcriptional response to hypoxia. These genes have been primarily studied in cancer cells and hence little is understood about their normal function and regulation. We show here using in situ hybridization that ndrgs are expressed in metabolically demanding organs of the zebrafish embryo, such as the brain, kidney, and heart. To investigate whether ndrgs are hypoxia-responsive, we exposed embryos to different durations and severity of hypoxia and analyzed transcript levels. We observed that ndrgs are differentially regulated by hypoxia and that ndrg1a has the most robust response, with a ninefold increase following prolonged anoxia. We further show that this treatment resulted in de novo expression of ndrg1a in tissues where the transcript is not observed under normoxic conditions and changes in Ndrg1a protein expression post-reoxygenation. These findings provide an entry point into understanding the role of this conserved gene family in the adaptation of normal cells to hypoxia and reoxygenation.
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Affiliation(s)
- Nguyet Le
- Department of Biological SciencesUniversity of Maryland, Baltimore CountyBaltimoreMarylandUSA
| | - Timothy M. Hufford
- Department of Biological SciencesUniversity of Maryland, Baltimore CountyBaltimoreMarylandUSA
| | - Jong S. Park
- Department of Biological SciencesUniversity of Maryland, Baltimore CountyBaltimoreMarylandUSA
| | - Rachel M. Brewster
- Department of Biological SciencesUniversity of Maryland, Baltimore CountyBaltimoreMarylandUSA
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Autophagy: A Novel Horizon for Hair Cell Protection. Neural Plast 2021; 2021:5511010. [PMID: 34306061 PMCID: PMC8263289 DOI: 10.1155/2021/5511010] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Accepted: 06/21/2021] [Indexed: 12/20/2022] Open
Abstract
As a general sensory disorder, hearing loss was a major concern worldwide. Autophagy is a common cellular reaction to stress that degrades cytoplasmic waste through the lysosome pathway. Autophagy not only plays major roles in maintaining intracellular homeostasis but is also involved in the development and pathogenesis of many diseases. In the auditory system, several studies revealed the link between autophagy and hearing protection. In this review, we aimed to establish the correlation between autophagy and hair cells (HCs) from the aspects of ototoxic drugs, aging, and acoustic trauma and discussed whether autophagy could serve as a potential measure in the protection of HCs.
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Sonbay Yılmaz ND, Saka C, Oktay Arslan B, Aygener Yeşilyurt N, Saka D, Ardıç S, Akın İ. The effect of hypoxia on hearing function. Turk J Med Sci 2019; 49:1450-1454. [PMID: 31651111 PMCID: PMC7018208 DOI: 10.3906/sag-1902-210] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2019] [Accepted: 07/27/2019] [Indexed: 11/21/2022] Open
Abstract
Background/aim This study was conducted to determine the critical partial oxygen pressure (pO2) value that would impair hearing function by evaluating the effects of hypoxia on hearing function in subjects diagnosed with chronic obstructive pulmonary disease (CPOD). Materials and methods The study included 25 male and 5 female patients referred to our clinic who were diagnosed with COPD, according to spirometry and PaO2 values, and who did not show pathology upon autoscopic examination. The control group consisted of 14 female and 16 male patients who had no lung disease and were in the same age range as the COPD group. Results A statistically significant difference was found between the two groups for distortion-product otoacoustic emission (DPOAE) (P < 0.001). The COPD group was divided into two groups according to pO2 levels (pO2 ≤ 70 and pO2 > 70) in order to find a critical pO2 level which might cause significant change at a certain audiological extent. Conclusion Hypoxia causes long-term decline in hearing thresholds, deterioration of DPOAE results, and prolongation of I–V interpeak latency in auditory brainstem response. However, the critical oxygen level that disrupts hearing function could not be determined.
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Affiliation(s)
| | - Cem Saka
- Department of Ear, Nose, and Throat, Ankara Dışkapı Yıldırım Beyazıt Education and Training Hospital, Ankara, Turkey
| | - Burcu Oktay Arslan
- Department of Chest Diseases, Ministry of Health Sciences University,Dr. Suat Seren Chest Diseases and Chest Surgery Training and Research Hospital, İzmir, Turkey
| | | | - Dilek Saka
- Department of Chest Diseases, Ankara Atatürk Chest Diseases and Chest Surgery Training and Research Hospital, Ankara, Turkey
| | - Sadık Ardıç
- Department of Chest Diseases, Ankara Koru Hospital, Ankara, Turkey
| | - İstemihan Akın
- Department of Ear, Nose, and Throat, Ankara Dışkapı Yıldırım Beyazıt Education and Training Hospital, Ankara, Turkey
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Veile A, Zimmermann H, Lorenz E, Becher H. Is smoking a risk factor for tinnitus? A systematic review, meta-analysis and estimation of the population attributable risk in Germany. BMJ Open 2018; 8:e016589. [PMID: 29472253 PMCID: PMC5855477 DOI: 10.1136/bmjopen-2017-016589] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
OBJECTIVE To assess the epidemiological association of smoking status and tinnitus with a systematic review and meta-analysis and to estimate the population attributable risk in Germany. DATA SOURCES A systematic literature search in PubMed and ISI-Web of Science Core Collection resulted in 1026 articles that were indexed until 15 September 2015. Additionally, proceedings of the international tinnitus seminars and reference lists of relevant articles were screened. STUDY SELECTION Two reviewers searched independently for epidemiological studies. Tinnitus as a manifestation of tumours, vascular malformations, specific syndromes or as a consequence of surgical and medical treatment was not considered. Moreover, studies conducted among patients of ear, nose and throat clinics were excluded. DATA EXTRACTION If only raw data were provided, effect sizes were calculated. Further unpublished data were received by corresponding authors. DATA SYNTHESIS Data of 20 studies were pooled. Current smoking (OR 1.21, 95% CI 1.09 to 1.35), former smoking (OR 1.13, 95% CI 1.01 to 1.26) and ever smoking (OR 1.20, 95% CI 1.11 to 1.30) were significantly associated with tinnitus. Moreover, sensitivity analyses for severe tinnitus (OR 1.32, 95% CI 1.10 to 1.58) and for studies of superior quality (OR 1.15, 95% CI 1.03 to 1.29) showed increased risks. According to this, the population attributable risk estimate in Germany is 3.5%. CONCLUSION There is sufficient evidence that smoking is associated with tinnitus. As the review mainly consists of cross-sectional studies, the observed correlation does not give evidence of a causal relationship. Due to the impact of various confounders, further research is needed to provide more evidence on the strength of association and causal relationships.
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Affiliation(s)
- Annette Veile
- Institute of Public Health, Unit of Epidemiology and Biostatistics, University of Heidelberg, Heidelberg, Germany
| | - Heiko Zimmermann
- Institute of Public Health, Unit of Epidemiology and Biostatistics, University of Heidelberg, Heidelberg, Germany
| | - Eva Lorenz
- Institute of Public Health, Unit of Epidemiology and Biostatistics, University of Heidelberg, Heidelberg, Germany
- Institute of Medical Biostatistics, Epidemiology and Informatics, University Medical Center Mainz, Mainz, Germany
| | - Heiko Becher
- Institute of Public Health, Unit of Epidemiology and Biostatistics, University of Heidelberg, Heidelberg, Germany
- Institute of Medical Biometry and Epidemiology, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
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Lin J, Huang H, Lv G, Xu X, Lin W, Xu X, Cheng J, Zheng M. Chronic prenatal hypoxia impairs cochlear development, a mechanism involving connexin26 expression and promoter methylation. Int J Mol Med 2017; 41:852-858. [PMID: 29207085 PMCID: PMC5752184 DOI: 10.3892/ijmm.2017.3303] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2017] [Accepted: 11/02/2017] [Indexed: 12/31/2022] Open
Abstract
Chronic prenatal hypoxia is a damaging to fetal development and may have various consequences, including hearing loss. Connexin 26 (Cx26) is one of the major protein subunits required for gap junction formation, and has an important role in maintaining homeostasis in the cochlea and normal hearing. Cx26 mutation and expression abnormality are closely associated with inherited nonsyndromic deafness, but the association between Cx26 and prenatal hypoxia is less established. The present study aimed to examine Cx26 expression and aberrant methylation the Cx26 promoter region in the cochlea from rats exposed to chronic prenatal hypoxia. Hematoxylin and eosin staining demonstrated that the number of hair cells in the organ of Corti were less in the hypoxia group. Reverse transcription-quantitative polymerase chain reaction and western blot analysis revealed that protein and mRNA levels of Cx26 were decreased in the hypoxia group compared with the control group. Further bisulfite sequencing analysis revealed that prenatal hypoxia significantly increased the methylation status of the promoter region of the Cx26 gene. These results demonstrate that chronic prenatal hypoxia caused hearing impairment, and suggest that promoter region hypermethylation and expression downregulation of Cx26 underlie the mechanism of action.
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Affiliation(s)
- Jingcang Lin
- Department of Anatomy, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, Fujian 350004, P.R. China
| | - Huang Huang
- Department of Histology and Embryology, Quanzhou Medical College, Quanzhou, Fujian 362100, P.R. China
| | - Guorong Lv
- Department of Medical Imaging, Quanzhou Medical College, Quanzhou, Fujian 362100, P.R. China
| | - Xiangyang Xu
- Department of Histology and Embryology, Quanzhou Medical College, Quanzhou, Fujian 362100, P.R. China
| | - Wendong Lin
- Department of Anatomy, Quanzhou Medical College, Quanzhou, Fujian 362100, P.R. China
| | - Xianyan Xu
- Department of Anatomy, Quanzhou Medical College, Quanzhou, Fujian 362100, P.R. China
| | - Jing Cheng
- Department of Histology and Embryology, Quanzhou Medical College, Quanzhou, Fujian 362100, P.R. China
| | - Ming Zheng
- Department of Anatomy, School of Basic Medical Sciences, Fujian Medical University, Fuzhou, Fujian 350004, P.R. China
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Huang YS, Koo M, Chen JC, Hwang JH. The association between tinnitus and the risk of ischemic cerebrovascular disease in young and middle-aged patients: A secondary case-control analysis of a nationwide, population-based health claims database. PLoS One 2017; 12:e0187474. [PMID: 29095920 PMCID: PMC5667787 DOI: 10.1371/journal.pone.0187474] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Accepted: 10/20/2017] [Indexed: 11/20/2022] Open
Abstract
Background Tinnitus and ischemic cerebrovascular disease (ICVD) may share common pathophysiologic mechanisms. Nevertheless, no studies have investigated whether tinnitus is associated with a higher risk of ICVD. The aim of this study was to evaluate the risk of ICVD among young and middle-aged patients with tinnitus. Methods Using the Taiwan’s National Health Insurance Research Database, we identified 3,474 patients 20–45 years old with incident ICVD diagnosed between January 1, 2000 and December 31, 2010 and 17,370 controls, frequency matched on age interval, sex, and year of the index date. Risk of ICVD associated with tinnitus was assessed using multiple logistic regression analyses. Results Tinnitus was significantly associated with a higher risk of incident ICVD among young and middle-aged patients (adjusted odds ratio [OR] 1.66, 95% confidence interval [CI] 1.34–2.04), adjusting for sex, age, and comorbidities. In addition, sex-stratified analysis showed that the associations were significant in both male (adjusted OR 1.55, 95% CI 1.16–2.07) and female patients (adjusted OR 1.77, 95% CI 1.30–2.41). Furthermore, tinnitus was significantly associated with a higher risk of ICVD in the 20.0–29.9 years (adjusted OR 4.11, 95% CI 1.98–8.52) and 30.0–39.9 years (adjusted OR 2.19, 95% CI 1.57–3.05) age groups, but not in the 40.0–45.0 years age group. Conclusions Tinnitus could be a novel risk factor or clinical indicator for young ischemic stroke, and further investigations are warranted.
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Affiliation(s)
- Yung-Sung Huang
- Department of Neurology, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Dalin, Chiayi, Taiwan
| | - Malcolm Koo
- Department of Medical Research, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Dalin, Chiayi, Taiwan
- Dalla Lana School of Public Health, University of Toronto, Toronto, Ontario, Canada
| | - Jin-Cherng Chen
- Department of Neurosurgery, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Dalin, Chiayi, Taiwan
- School of Medicine, Tzu Chi University, Hualien City, Taiwan
| | - Juen-Haur Hwang
- School of Medicine, Tzu Chi University, Hualien City, Taiwan
- Department of Otolaryngology, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Dalin, Chiayi, Taiwan
- * E-mail:
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Matsumura E, Matas CG, Sanches SGG, Magliaro FCL, Pedreño RM, Genta PR, Lorenzi-Filho G, Carvallo RMM. Severe obstructive sleep apnea is associated with cochlear function impairment. Sleep Breath 2017; 22:71-77. [PMID: 28681146 DOI: 10.1007/s11325-017-1530-5] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Revised: 05/19/2017] [Accepted: 06/12/2017] [Indexed: 11/30/2022]
Abstract
PURPOSE The purpose of this study is to investigate the association between obstructive sleep apnea (OSA) with middle ear acoustic transference and cochlear function. METHODS Male individuals with and without mild, moderate, and severe OSA according to standard criteria of full polysomnography and no co-morbidities were studied. Subjects with BMI ≥40 kg/m2, present or past treatment for OSA, with heart failure, diabetes, hypertension, dyslipidemia, stroke, use of chronic medications, and previous history of risk for hearing loss were excluded. All subjects were submitted to full polysomnography, evaluation of wideband acoustic immittance by energy of absorbance (EA), and distortion product otoacoustic emissions (DPOAE). RESULTS We studied 38 subjects (age 35.8 ± 7.2 years, BMI 28.8 ± 3.8 kg/m2) divided into no OSA (n = 10, age 33.6 ± 6.4 years, BMI 26.9 ± 4.1 kg/m2), mild (n = 11, age 32.8 ± 2.9 years, BMI 28.5 ± 3.5 kg/m2), moderate (n = 8, age 34.1 ± 6.8 years, BMI 29.6 ± 3.3 kg/m2), and severe OSA (n = 9, age 41.2 ± 9.2 years, BMI 30.5 ± 3.8 kg/m2). EA was similar between groups. In contrast, patients with severe OSA presented significantly lower DPOAE amplitudes when compared to the control, mild, and moderate OSA groups (p ≤ 0.03, for all comparisons). CONCLUSIONS Acoustic transference function of middle ear is similar in adults with and without OSA. Severe OSA is independently associated with cochlear function impairment in patients with no significant co-morbidities.
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Affiliation(s)
- Erika Matsumura
- Speech and Hearing Sciences Investigation on Human Hearing Laboratory, Physical Therapy, Speech, Language and Hearing Sciences and Occupational Therapy Department, Faculdade de Medicina - FMUSP, Universidade de Sao Paulo, Sao Paulo, Brazil.
| | - Carla G Matas
- Speech and Hearing Sciences Investigation on Hearing Electrophysiology Laboratory, Physical Therapy, Speech, Language and Hearing Sciences and Occupational Therapy Department, Faculdade de Medicina - FMUSP, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - Seisse G G Sanches
- Speech and Hearing Sciences Investigation on Human Hearing Laboratory, Physical Therapy, Speech, Language and Hearing Sciences and Occupational Therapy Department, Faculdade de Medicina - FMUSP, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - Fernanda C L Magliaro
- Speech and Hearing Sciences Investigation on Hearing Electrophysiology Laboratory, Physical Therapy, Speech, Language and Hearing Sciences and Occupational Therapy Department, Faculdade de Medicina - FMUSP, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - Raquel M Pedreño
- Speech and Hearing Sciences Investigation on Hearing Electrophysiology Laboratory, Physical Therapy, Speech, Language and Hearing Sciences and Occupational Therapy Department, Faculdade de Medicina - FMUSP, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - Pedro R Genta
- Sleep Laboratory, Pulmonary Division, Heart Institute (InCor), Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - Geraldo Lorenzi-Filho
- Sleep Laboratory, Pulmonary Division, Heart Institute (InCor), Hospital das Clinicas HCFMUSP, Faculdade de Medicina, Universidade de Sao Paulo, Sao Paulo, Brazil
| | - Renata M M Carvallo
- Speech and Hearing Sciences Investigation on Human Hearing Laboratory, Physical Therapy, Speech, Language and Hearing Sciences and Occupational Therapy Department, Faculdade de Medicina - FMUSP, Universidade de Sao Paulo, Sao Paulo, Brazil
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Is hyperbaric oxygen therapy a salvage treatment option for sudden sensorineural hearing loss? The Journal of Laryngology & Otology 2016; 130:943-947. [PMID: 27572676 DOI: 10.1017/s0022215116008768] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
OBJECTIVE To investigate of the efficacy of hyperbaric oxygen therapy as a salvage treatment after unsuccessful oral corticosteroid therapy. METHODS Case notes of patients who were followed up because of idiopathic sudden sensorineural hearing loss between 2005 and 2011 in a tertiary care centre were examined retrospectively. Audiograms from before and after hyperbaric oxygen therapy were examined in terms of mean gains in pure tone average and at 0.25, 0.5, 1, 2, 4 and 8 kHz. In addition, recovery according to Siegel's criteria was noted. RESULTS Mean gain in pure tone average was 10.55 ± 13.56 dB. Mean gains at 0.25, 0.5, 1, 2, 4 and 8 kHz were 16.66 ± 18.43 dB, 16.94 ± 19.93 dB, 12.63 ± 16.71 dB, 7.36 ± 15.28 dB, 5.27 ± 11.58 dB and 2.91 ± 12.44 dB, respectively. Three patients had complete recovery, 1 had partial recovery, 5 had slight recovery and 25 had no improvement. CONCLUSION Hyperbaric oxygen utilised as a salvage therapy after failed corticosteroid therapy may be beneficial in some patients. Studies with more patients are needed.
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16
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Deniz M, Çiftçi Z, Ersözlü T, Gültekin E, Alp R. The evaluation of auditory system in obstructive sleep apnea syndrome (OSAS) patients. Am J Otolaryngol 2016; 37:299-303. [PMID: 27105973 DOI: 10.1016/j.amjoto.2016.03.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2016] [Revised: 03/06/2016] [Accepted: 03/13/2016] [Indexed: 10/22/2022]
Abstract
OBJECTIVE The authors of the present study aimed to investigate the impact of hypoxemia on the auditory functions of OSAS patients and discussed their findings under the scope of the existing literature. MATERIALS AND METHODS 160 patients who underwent a polysomnographic analysis for the diagnosis of possible sleep disordered breathing between January 2015 and December 2015 were enrolled in this study. Polysomnography tests were conducted at the sleep laboratory of the department of neurology at the same institute. Comprehensive otorhinolaryngological examinations of all participants were conducted by the same senior otorhinolaryngologist. Three study groups and a control group were designated in the study. Each study group was designated according to the severity of the apnea hypopnea index (AHI) and blood oxygen saturation values of the participants. All participants underwent pure tone auditometry and otoacoustic emission testing (OAE). Statistical data analysis was performed using SPSS for Windows, version 17 (SPSS Inc., Chicago, IL, USA). RESULTS Audiological assessment of the patients revealed that all patients in the control group and in mild OSAS group had normal hearing thresholds (lower than 26dB). However, the patients who had moderate and severe OSAS had varying degrees of sensorineural hearing losses. As far as body mass indexes are concerned, statistically significant differences were observed among the groups (p=0.038). CONCLUSION There is convincing evidence that the risk of progressive dysfunction in vascular and neural structures of the body is inevitable for the patients who suffer from a chronic hypoxemic condition secondary to OSAS. The findings of the present study indicated auditory transduction and transmission mechanisms may also be affected in moderate and severe OSAS patients. Therefore, via taking necessary steps in preventing hypoxemia at the outset, OSAS patients may be protected from the long term detrimental effects of chronic hypoxemia on the auditory system.
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Seo YJ, Chung HJ, Park SY, Kim CH, Lee JG, Kim SH, Cho HJ. Lowest Oxyhemoglobin Saturation May Be an Independent Factor Influencing Auditory Function in Severe Obstructive Sleep Apnea. J Clin Sleep Med 2016; 12:653-8. [PMID: 26857050 DOI: 10.5664/jcsm.5786] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Accepted: 12/21/2015] [Indexed: 11/13/2022]
Abstract
STUDY OBJECTIVES The aims of this study were to determine if a correlation exists between the level of hypoxia induced by severe obstructive sleep apnea syndrome (OSAS) and the level of auditory dysfunction when verifying such a relationship using polysomnography (PSG). METHODS A retrospective review of 41 patients with severe OSAS was performed. Independent risk factors for hearing impairment included parameters of PSG, which were analyzed in two hearing groups at a level ≥ 40 decibels (dB). RESULTS Oxyhemoglobin saturation, especially the lowest oxyhemoglobin saturation level, showed lower thresholds in the hearing impairment group than in the control group (p = 0.039 at NREM stage; p = 0.029 at REM stage; p = 0.001 at total sleep stage). After adjusting for other risk factors, the sole variable that remained significant was lowest oxyhemoglobin saturation (total; p = 0.046). In the correlation analysis, a decreasing lowest oxyhemoglobin saturation (from all subjects, n = 41) correlated with a greater mean hearing threshold (R(2) = 0.297; p < 0.001). CONCLUSION Our results indicated that lowest oxyhemoglobin saturation in PSG is the only variable correlated with the hearing threshold. This finding could be predictive of possible hearing alternation in patients with severe OSAS. COMMENTARY A commentary on this article appears in this issue on page 641.
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Affiliation(s)
- Young Joon Seo
- Department of Otorhinolaryngology, Yonsei University Wonju College of Medicine, Seoul, South Korea
| | - Hyo Jin Chung
- Department of Otolaryngology, Yonsei University College of Medicine Seoul, South Korea
| | - Sang Yoo Park
- Department of Otorhinolaryngology, Yonsei University Wonju College of Medicine, Seoul, South Korea
| | - Chang-Hoon Kim
- Department of Otolaryngology, Yonsei University College of Medicine Seoul, South Korea.,The Airway Mucus Institute, Yonsei University College of Medicine, Seoul, South Korea
| | - Jeung-Gweon Lee
- Department of Otolaryngology, Yonsei University College of Medicine Seoul, South Korea
| | - Sung Huhn Kim
- Department of Otolaryngology, Yonsei University College of Medicine Seoul, South Korea
| | - Hyung-Ju Cho
- Department of Otolaryngology, Yonsei University College of Medicine Seoul, South Korea.,The Airway Mucus Institute, Yonsei University College of Medicine, Seoul, South Korea
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Sharafkhaneh A, Hirshkowitz M. Can You Hear Me Now? J Clin Sleep Med 2016; 12:641-2. [PMID: 27092694 DOI: 10.5664/jcsm.5780] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2016] [Accepted: 03/21/2016] [Indexed: 11/13/2022]
Affiliation(s)
- Amir Sharafkhaneh
- Department of Medicine, Section of Pulmonary, Critical Care and Sleep Medicine, Baylor College of Medicine, Houston, TX.,Medical Care Line, Section of Pulmonary, Critical Care and Sleep Medicine, Michael E. DeBakey VA Medical Center, Houston, TX
| | - Max Hirshkowitz
- Consulting Professor, Division of Public Mental Health and Population Sciences, School of Medicine, Stanford University, Stanford, CA
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Gender, nocturnal hypoxia, and arousal influence brainstem auditory evoked potentials in patients with obstructive sleep apnea. Sleep Breath 2016; 20:1239-1244. [DOI: 10.1007/s11325-016-1346-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2015] [Revised: 03/08/2016] [Accepted: 04/07/2016] [Indexed: 12/21/2022]
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20
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Tinnitus: from basic principles to therapy. HNO 2015; 63:253-7. [DOI: 10.1007/s00106-014-2974-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Abstract
Sensorineural hearing loss is the most common type of hearing impairment worldwide. It arises as a consequence of damage to the cochlea or auditory nerve, and several structures are often affected simultaneously. There are many causes, including genetic mutations affecting the structures of the inner ear, and environmental insults such as noise, ototoxic substances, and hypoxia. The prevalence increases dramatically with age. Clinical diagnosis is most commonly accomplished by measuring detection thresholds and comparing these to normative values to determine the degree of hearing loss. In addition to causing insensitivity to weak sounds, sensorineural hearing loss has a number of adverse perceptual consequences, including loudness recruitment, poor perception of pitch and auditory space, and difficulty understanding speech, particularly in the presence of background noise. The condition is usually incurable; treatment focuses on restoring the audibility of sounds made inaudible by hearing loss using either hearing aids or cochlear implants.
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Affiliation(s)
- Kathryn Hopkins
- School of Psychological Sciences, University of Manchester, Manchester, UK.
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22
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Pezzoli M, Magnano M, Maffi L, Pezzoli L, Marcato P, Orione M, Cupi D, Bongioannini G. Hyperbaric oxygen therapy as salvage treatment for sudden sensorineural hearing loss: a prospective controlled study. Eur Arch Otorhinolaryngol 2014; 272:1659-66. [PMID: 25318685 DOI: 10.1007/s00405-014-2948-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2013] [Accepted: 02/08/2014] [Indexed: 10/24/2022]
Abstract
The most commonly used treatment for sensorineural sudden hearing loss (SSHL) in clinical practice is the administration of steroids; however, a favorable result is not always obtained. We studied 58 patients who failed to recover after primary treatment with IV steroids, 44 of these met our inclusion criteria (mean age 50.7, 27 males, range 30-74). We treated 23 patients (mean age 47.3, 16 males, age range 22-74) with hyperbaric oxygen therapy (HBO) (2.5 ATA for 60 min for 15 treatments), while 21 (mean age 54.5, 11 males, age range 22-71) patients refused to be treated and served as a non-randomized control group. Patients treated with HBO had a mean improvement of 15.6 dB (SD ± 15.3), with 1 of them completely healed, 5 with a good recovery, 10 with a fair recovery and 7 unchanged. Patients who were not treated had a spontaneous mean improvement of 5.0 dB (SD ± 11.4) with 3 patients with a good recovery, 1 patient with a fair recovery and 17 patients unchanged. Mean improvement was significantly better in patients treated with HBO compared to controls (p = 0.0133). Patients with worst hearing had the greater degree of improvement whether or not they were treated in the first 10 days after the onset of the hearing loss or between 11 and 30 days. In conclusion, hyperbaric oxygen therapy can lead to significant improvement of pure tone hearing thresholds in patients with SSHL who failed primary corticosteroid treatment and are within 4 weeks of the onset of deafness.
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Affiliation(s)
- M Pezzoli
- ENT Department, Hospital Mauriziano "Umberto I", Corso Re Umberto 109, 10128, Turin, Italy,
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Cuna V, Battaglino G, Capelli I, Sala E, Donati G, Cianciolo G, La Manna G. Hypoacusia and Chronic Renal Dysfunction: New Etiopathogenetic Prospective. Ther Apher Dial 2014; 19:111-8. [DOI: 10.1111/1744-9987.12232] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Vania Cuna
- Department of Experimental Diagnostic and Specialty Medicine (DIMES); Nephrology, Dialysis and Renal Transplant Unit; St Orsola Hospital; University of Bologna; Bologna Italy
| | - Giuseppe Battaglino
- Department of Experimental Diagnostic and Specialty Medicine (DIMES); Nephrology, Dialysis and Renal Transplant Unit; St Orsola Hospital; University of Bologna; Bologna Italy
| | - Irene Capelli
- Department of Experimental Diagnostic and Specialty Medicine (DIMES); Nephrology, Dialysis and Renal Transplant Unit; St Orsola Hospital; University of Bologna; Bologna Italy
| | - Elisa Sala
- Department of Experimental Diagnostic and Specialty Medicine (DIMES); Nephrology, Dialysis and Renal Transplant Unit; St Orsola Hospital; University of Bologna; Bologna Italy
| | - Gabriele Donati
- Department of Experimental Diagnostic and Specialty Medicine (DIMES); Nephrology, Dialysis and Renal Transplant Unit; St Orsola Hospital; University of Bologna; Bologna Italy
| | - Giuseppe Cianciolo
- Department of Experimental Diagnostic and Specialty Medicine (DIMES); Nephrology, Dialysis and Renal Transplant Unit; St Orsola Hospital; University of Bologna; Bologna Italy
| | - Gaetano La Manna
- Department of Experimental Diagnostic and Specialty Medicine (DIMES); Nephrology, Dialysis and Renal Transplant Unit; St Orsola Hospital; University of Bologna; Bologna Italy
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Zenner HP, Vonthein R, Zenner B, Leuchtweis R, Plontke SK, Torka W, Pogge S, Birbaumer N. Standardized tinnitus-specific individual cognitive-behavioral therapy: A controlled outcome study with 286 tinnitus patients. Hear Res 2013; 298:117-25. [DOI: 10.1016/j.heares.2012.11.013] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/13/2011] [Revised: 10/13/2012] [Accepted: 11/12/2012] [Indexed: 11/25/2022]
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25
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Lopez-Gonzalez MA, Cherta G, Nieto JA, Esteban F. Otology versus Otosociology. ISRN OTOLARYNGOLOGY 2012; 2012:145317. [PMID: 23762611 PMCID: PMC3664198 DOI: 10.5402/2012/145317] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/29/2012] [Accepted: 10/03/2012] [Indexed: 11/23/2022]
Abstract
Otology concerns the biological study of ear alterations and diseases, solely. So, the diagnosis of audiovestibular diseases tends to be idiopathic or is based on theoretical concepts such as idiopathic sudden deafness, Ménière disease, benign paroxysmal positional vertigo, tinnitus, hyperacusis, or idiopathic facial paralysis. The treatment for these pathologies is symptomatic. Otosociology takes the aetiology and pathogenesis of the ear and situates them within the social and cultural environment of the patient. Then, audiovestibular disease is based on evidence, and the treatment options seek to solve the causes and consequences produced. Otosociology should be considered as a new discipline. Otosociology came into being since otology does not provide definitive solutions for the audiovestibular alterations produced from the point of view of the ear, whereas otosociology finds these solutions within the social/cultural environment of the patient. Where otology emphasises the diseases of the ear, otosociology deals with social manifestations. Where otology deals with idiopathic diseases, otosociology deals with causes and pathogeny produced by interactions in the social and cultural surroundings of the patient. Where otology offers symptomatic treatment, otosociology offers treatment of causes and consequences. Otosociology can fill significant voids in audiovestibular processes from the perspective of the patient's social environment.
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Affiliation(s)
- Miguel A. Lopez-Gonzalez
- UGC Otorhinolaryngology, Virgen of Rocio University Hospital, C/Manuel Siurot, s/n 41.013 Sevilla, Spain
| | - Georgina Cherta
- Faculty of Political Sciences and Sociology, National University of Distance Education, 29.006 Malaga, Spain
| | - Jose A. Nieto
- Faculty of Political Sciences and Sociology, University of Madrid, 28.080 Madrid, Spain
| | - Francisco Esteban
- UGC Otorhinolaryngology, Virgen of Rocio University Hospital, C/Manuel Siurot, s/n 41.013 Sevilla, Spain
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Liu J, Yu P, Lin Y, Zhou N, Li T, Ma F, Mao L. In vivo electrochemical monitoring of the change of cochlear perilymph ascorbate during salicylate-induced tinnitus. Anal Chem 2012; 84:5433-8. [PMID: 22703231 DOI: 10.1021/ac301087v] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
As one of the most important neurochemicals in biological systems, ascorbate plays vital roles in many physiological and pathological processes. In order to understand the roles of ascorbate in the pathological process of tinnitus, this study demonstrates an in vivo method for real time monitoring of the changes of ascorbate level in the cochlear perilymph of guinea pigs during the acute period of tinnitus induced by local microinfusion of salicylate with carbon fiber microelectrodes (CFMEs) modified with multiwalled carbon nanotubes (MWNTs). To accomplish in vivo electrochemical monitoring of ascorbate in the microenvironment of the cochlear perilymph, the MWNT-modified CFME is used as working electrode, a microsized Ag/AgCl is used as reference electrode, and Pt wire is used as counter electrode. Three electrodes are combined together around a capillary to form integrated capillary-electrodes. The integrated capillary-electrode is carefully implanted into the cochlear perilymph of guinea pigs and used both for externally microinfusing of salicylate into the cochlear perilymph and for real time monitoring of the change of ascorbate levels. The in vivo voltammetric method based on the integrated capillary-electrodes possesses a high selectivity and a good linearity for ascorbate determination in the cochlear perilymph of guinea pigs. With such a method, the basal level of cochlear perilymph ascorbate is determined to be 45.0 ± 5.1 μM (n = 6). The microinfusion of 10 mM salicylate (1 μL/min, 5 min) into the cochlear decreases the ascorbate level to 28 ± 10% of the basal level (n = 6) with a statistical significance (P < 0.05), implying that the decrease in ascorbate level in the cochlear may be associated with salicylate-induced tinnitus. This study essentially offers a new method for in vivo monitoring of the cochlear perilymph ascorbate following the salicylate-induced tinnitus and can thus be useful for investigation on chemical essences involved in tinnitus.
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Affiliation(s)
- Junxiu Liu
- Department of Otorhinolaryngology, Peking University Third Hospital, Beijing 100083, P. R. China
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27
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Abstract
Normal blood supply to the cochlea is critically important for establishing the endocochlear potential and sustaining production of endolymph. Abnormal cochlear microcirculation has long been considered an etiologic factor in noise-induced hearing loss, age-related hearing loss (presbycusis), sudden hearing loss or vestibular function, and Meniere's disease. Knowledge of the mechanisms underlying the pathophysiology of cochlear microcirculation is of fundamental clinical importance. A better understanding of cochlear blood flow (CoBF) will enable more effective management of hearing disorders resulting from aberrant blood flow. This review focuses on recent discoveries and findings related to the physiopathology of the cochlear microvasculature.
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Affiliation(s)
- Xiaorui Shi
- Oregon Hearing Research Center (NRC04), Department of Otolaryngology/Head & Neck Surgery, Oregon Health & Science University, 3181 SW Sam Jackson Park Road, Portland, OR 97239, USA.
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28
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Is obstructive sleep apnea syndrome a risk factor for auditory pathway? Sleep Breath 2011; 16:413-7. [DOI: 10.1007/s11325-011-0517-x] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2010] [Revised: 03/18/2011] [Accepted: 03/22/2011] [Indexed: 10/18/2022]
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29
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Lin CD, Wei IH, Lai CH, Hsia TC, Kao MC, Tsai MH, Wu CH, Tsai MH. Hyperbaric oxygen upregulates cochlear constitutive nitric oxide synthase. BMC Neurosci 2011; 12:21. [PMID: 21342510 PMCID: PMC3050772 DOI: 10.1186/1471-2202-12-21] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2010] [Accepted: 02/22/2011] [Indexed: 11/15/2022] Open
Abstract
Background Hyperbaric oxygen therapy (HBOT) is a known adjuvant for treating ischemia-related inner ear diseases. Controversies still exist in the role of HBOT in cochlear diseases. Few studies to date have investigated the cellular changes that occur in inner ears after HBOT. Nitric oxide, which is synthesized by nitric oxide synthase (NOS), is an important signaling molecule in cochlear physiology and pathology. Here we investigated the effects of hyperbaric oxygen on eardrum morphology, cochlear function and expression of NOS isoforms in cochlear substructures after repetitive HBOT in guinea pigs. Results Minor changes in the eardrum were observed after repetitive HBOT, which did not result in a significant hearing threshold shift by tone burst auditory brainstem responses. A differential effect of HBOT on the expression of NOS isoforms was identified. Upregulation of constitutive NOS (nNOS and eNOS) was found in the substructures of the cochlea after HBOT, but inducible NOS was not found in normal or HBOT animals, as shown by immunohistochemistry. There was no obvious DNA fragmentation present in this HBOT animal model. Conclusions The present evidence indicates that the customary HBOT protocol may increase constitutive NOS expression but such upregulation did not cause cell death in the treated cochlea. The cochlear morphology and auditory function are consequently not changed through the protocol.
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Affiliation(s)
- Chia-Der Lin
- Department of Otolaryngology-Head and Neck Surgery, China Medical University Hospital, and Graduate Institute of Clinical Medical Science, Department of Anatomy, School of Medicine, China Medical University, Taichung, Taiwan
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Hyperbaric oxygen therapy as salvage treatment for sudden sensorineural hearing loss: review of rationale and preliminary report. J Laryngol Otol 2009; 124:e2. [DOI: 10.1017/s0022215109992052] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
AbstractBackground:The management of sudden sensorineural hearing loss has not yet been standardised. Hyperbaric oxygen therapy influences recovery from sudden sensorineural hearing loss, but the underlying mechanism is unknown and the appropriate indications and protocols undetermined.Materials and methods:Nineteen patients affected by sudden sensorineural hearing loss were treated after unsuccessful medical therapy, either in an acute or chronic setting. Pure oxygen inhalation at 2.5 atmospheres absolute pressure was administered for 90 minutes, for 30 sessions. Frequency-specific and average pure tone hearing thresholds were determined before and after hyperbaric oxygen therapy. The number of hyperbaric oxygen therapy sessions, the patient's age and any therapeutic delay were considered as quantitative variables possibly influencing outcome. Stepwise multivariate analysis was performed.Results:Salvage hyperbaric oxygen therapy appeared to improve patients' pure tone hearing thresholds, particularly at low frequencies. Positive results were more likely with increased patient age and reduced delay in receiving hyperbaric oxygen therapy.Conclusion:Hyperbaric oxygen therapy has a strong scientific rationale, and improves pure tone hearing thresholds in cases of sudden sensorineural hearing loss unresponsive to medical therapy. Further research may be able to identify those patients with sudden sensorineural hearing loss for whom hyperbaric oxygen therapy would be most cost-effective.
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Stenner M, Stürmer K, Beutner D, Klussmann JP. Sudden bilateral sensorineural hearing loss after intravenous cocaine injection: A case report and review of the literature. Laryngoscope 2009; 119:2441-3. [DOI: 10.1002/lary.20711] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Uchida Y, Sugiura S, Nakashima T, Ando F, Shimokata H. Endothelin-1 gene polymorphism and hearing impairment in elderly Japanese. Laryngoscope 2009; 119:938-43. [DOI: 10.1002/lary.20181] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Mazurek B, Haupt H, Szczepek AJ, Sandmann J, Gross J, Klapp BF, Kiesewetter H, Kalus U, Stöver T, Caffier PP. Evaluation of vardenafil for the treatment of subjective tinnitus: a controlled pilot study. J Negat Results Biomed 2009; 8:3. [PMID: 19222841 PMCID: PMC2649886 DOI: 10.1186/1477-5751-8-3] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2008] [Accepted: 02/17/2009] [Indexed: 11/20/2022] Open
Abstract
Background Vardenafil (Levitra®) represents a potent and highly selective phosphodiesterase type 5 (PDE5) inhibitor, which is established for treatment of various diseases. There are several unpublished reports from patients stating that vardenafil has a considerable therapeutic effect on their concomitant tinnitus. This pilot study was conducted to specifically assess the effect of vardenafil in patients with chronic tinnitus. Methods This trial was based on a prospective, randomized, double-blind, placebo-controlled, parallel group design. Fourty-two consecutive subjects with mon- or binaural chronic tinnitus received 10 mg vardenafil (N = 21) or matching placebo tablets (N = 21) administered orally twice a day over a period of 12 weeks. Clinical examination and data acquisition took place at each visit: at baseline, after 4 weeks, after 12 weeks (end of treatment with study medication), and at non-medicated follow-up after 16 weeks. Assessment of clinical effectiveness was based on a standardized tinnitus questionnaire (TQ), the Short Form 36 health survey (SF-36), audiometric measurements (mode, pitch and loudness of tinnitus; auditory thresholds) and biomarkers of oxidative stress in patients' blood (malondialdehyde, protein carbonyl, homocysteine and total antioxidative status). Therapeutic efficacy was evaluated by comparison of subjective and objective parameters with baseline data between both treatment groups (ANCOVA). Results Vardenafil had no superior efficacy over placebo in the treatment of chronic tinnitus during this study. The primary efficacy criterion 'TQ total score' failed to demonstrate significant improvement compared to placebo. Subjective reports of TQ subscales and general quality of life areas (SF-36), objective audiometric examinations as well as investigated biomarkers for oxidative stress did not reveal any significant treatment effects. The safety profile was favorable and consistent with that in other vardenafil studies. Conclusion Although hypoxia and ischemia play a special role in the pathogenesis of tinnitus, the PDE5-inhibitor-induced increase of nitric oxide-mediated vasodilatation exerted no specific influence on tinnitus symptomatology. Considering the unclear risk of rarely associated hearing impairment, systemic application of vardenafil or other PDE5 inhibitors prove to be not appropriate for therapy of chronic tinnitus.
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Affiliation(s)
- Birgit Mazurek
- Department of Otorhinolaryngology, Tinnitus Centre and Molecular Biology Research Laboratory, Charité-Universitätsmedizin Berlin, Charitéplatz 1, 10117 Berlin, Germany.
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Wang H, Turner JG, Ling L, Parrish JL, Hughes LF, Caspary DM. Age-related changes in glycine receptor subunit composition and binding in dorsal cochlear nucleus. Neuroscience 2009; 160:227-39. [PMID: 19217931 DOI: 10.1016/j.neuroscience.2009.01.079] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2008] [Revised: 01/22/2009] [Accepted: 01/23/2009] [Indexed: 10/21/2022]
Abstract
Age-related hearing loss, presbycusis, can be thought of, in part, as a slow progressive peripheral deafferentation. Previous studies suggest that certain deficits seen in presbycusis may partially result from functional loss of the inhibitory neurotransmitter glycine in dorsal cochlear nucleus (DCN). The present study assessed age-related behavioral gap detection changes and neurochemical changes of postsynaptic glycine receptor (GlyRs) subunits and their anchoring protein gephyrin in fusiform cells of young (7-11 months) and aged (28-33 months) Fischer brown Norway (FBN) rats. Aged rats showed significantly (20-30 dB) elevated auditory brainstem-evoked response thresholds across all tested frequencies and worse gap detection ability compared to young FBN rats. In situ hybridization and quantitative immunocytochemistry were used to measure GlyR subunit message and protein levels. There were significant age-related increases in the alpha(1) subunit message with significant age-related decreases in alpha(1) subunit protein. Gephyrin message and protein showed significant increases in aged DCN fusiform cells. The pharmacologic consequences of these age-related subunit changes were assessed using [3H] strychnine binding. In support of the age-related decrease of alpha(1) subunit protein levels in DCN, there was a significant age-related decrease in the total number of GlyR binding sites with no significant change in affinity. These age-related changes may reflect an effort to reestablish a homeostatic balance between excitation and inhibition impacting on DCN fusiform cells by downregulation of inhibitory function in the face of an age-related loss of peripheral input. Age-related decrease in presynaptic glycine release results in altered subunit composition and this may correlate with loss of temporal coding of the aged fusiform cell in DCN. The previously reported role for gephyrin in retrograde intracellular receptor subunit trafficking could contribute to the alpha(1) decrease in the face of increased message.
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Affiliation(s)
- H Wang
- Department of Pharmacology, Southern Illinois University School of Medicine, 801 North Rutledge Street, P.O. Box 19629, Springfield, IL 62794-9629, USA
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Shi X, Han W, Yamamoto H, Tang W, Lin X, Xiu R, Trune DR, Nuttall AL. The cochlear pericytes. Microcirculation 2008; 15:515-29. [PMID: 19086261 DOI: 10.1080/10739680802047445] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
OBJECTIVES Cochlear pericytes are not well characterized. The aim of this study was to further advance the characterization of cochlear pericyte location and distribution, with particular focus on pericyte-related proteins on the capillaries of the cochlear lateral wall that are functionally integral to structure, contraction, and gap junction transport. MATERIALS AND METHODS Cochlear pericytes were identified by the immunofluorescence labeling of pericyte marker proteins, including alpha-smooth muscle actin (alpha-SMA), desmin, Thy-1, tropomyosin, and NG2, and by morphological identification, using fluorescence, electron, and differential interference contrast microscopy. RESULTS Pericytes were predominately found in the capillary network of the cochlear lateral wall, with considerable morphological heterogeneity across different types of microvessels. For example, pericytes on the vessels of the spiral ligament (V/SL) strongly expressed a gap junction protein, connexin 40, and were positive for alpha-SMA, tropomyosin, and desmin. In contrast, pericytes on the vessels of the stria vascularis (V/SV) were positive for desmin, and were negative for alpha-SMA and tropomyosin. CONCLUSIONS The capillary networks of the cochlear lateral wall comprise a rich population of pericytes. These pericytes are morphologically heterogeneous, with protein expression potentially indicative of function.
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Affiliation(s)
- Xiaorui Shi
- Oregon Hearing Research Center (NRC04), Oregon Health & Science University, Portland, Oregon 97239-3098, USA.
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Olzowy B, von Gleichenstein G, Canis M, Plesnila N, Mees K. Complex level alterations of the 2f (1)-f (2) distortion product due to hypoxia in the guinea pig. Eur Arch Otorhinolaryngol 2008; 265:1329-33. [PMID: 18389267 DOI: 10.1007/s00405-008-0663-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/02/2007] [Accepted: 03/25/2008] [Indexed: 10/22/2022]
Abstract
It is controversially discussed inasmuch acute hearing disorders might originate from impaired cochlear circulation. Hypoxia-specific alterations of inner ear parameters measurable in patients with acute sensorineural hearing loss would therefore be of great interest. Aim of this study was to characterize hypoxia-related alterations of the 2f (1)-f (2) distortion product. Nine guinea pigs were anaesthetized by i.m. administration of Midazolam, Medetomidin and Fentanyl. For introduction of hypoxia, the spontaneously breathing animals were offered a gas mixture of N(2)O and O(2) containing either 21 or 12-13% O(2). Distortion product otoacoustic emissions (DPOAEs) were continuously monitored at f (2) = 16 kHz; f (2)/f (1) = 1, 2; DP-definition = 2f (1)-f (2); L (1) = 65 dB and L (2) = 55 dB, while inhaled oxygen was switched from 21 to 12-13% and back. Oxygen saturation (SaO(2)) was continuously monitored. Data from an hypoxic interval were only used for further data processing if DPOAE levels were stable before and after hypoxia. Six hypoxic intervals in five animals fulfilled the stability criterion. During the hypoxic interval with the highest measured SaO(2) (75%), no alterations of DPOAE levels were observed. During the remaining five hypoxic intervals, when SaO(2) ranged between 57 and 70%, DPOAE levels were on average lower with an increased standard deviation compared to mean pre-hypoxic levels. Mean decrease correlated with the decrease of SaO(2 )(r = 0.90, P = 0.014). Alterations followed a characteristic time course-when hypoxia was started, DPOAE levels exhibited a short increase before they decreased and remarkably destabilized. After re-oxygenation DPOAE levels showed a pronounced level decrease, while SaO(2) already had recovered to pre-hypoxic values. After reaching a minimum, DPOAE levels slowly recovered to pre-hypoxic values. The decrease of DPOAE levels during hypoxia and the post-hypoxic level alterations have similarly been described by other authors before, while the distinct destabilization and transiently increased DPOAE levels have not been explicitly mentioned. A micromechanical mechanism that might explain a transient level increase and the post-hypoxic DPOAE level changes is discussed.
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Affiliation(s)
- Bernhard Olzowy
- Department of Otorhinolaryngology, Head and Neck Surgery, Ludwig Maximilians Universitiy of Munich Medical Center, Marchioninistr. 15, 81377, Munich, Germany.
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Cacace AT, Silver SM. Applications of magnetic resonance spectroscopy to tinnitus research: initial data, current issues, and future perspectives. PROGRESS IN BRAIN RESEARCH 2008; 166:71-81. [PMID: 17956773 DOI: 10.1016/s0079-6123(07)66007-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/24/2023]
Abstract
Conducting tinnitus research on humans poses challenges for investigators because of its subjective nature, the complexities involved in establishing underlying generator sites, the diversity of potential causes, and the inherent difficulties in dissociating reactive changes in the central nervous system (CNS), secondary to peripheral hearing loss, from those effects that may be due to tinnitus. One area of considerable interest concerns biomarker development, particularly in the areas of metabolism and biochemistry. Establishing a biomarker or a profile of metabolic and neurobiochemical constituents of tinnitus-related activity within the CNS could be of considerable importance for understanding the fundamental properties of this disorder. Therefore, in an effort to gain greater insight into mechanisms of tinnitus, magnetic resonance spectroscopy (MRS) is being proposed as one of the several tools that can address pertinent issues. Apart from its long-standing use in analytical chemistry and physics, MRS is also being applied with greater frequency in the neurosciences to gain insight into human brain function under normal and pathological states. By considering the history of this method and advances made to date, MRS has the potential to: (1) identify unique in vivo metabolic and neurobiochemical biomarkers associated with tinnitus in specific regions of the CNS, (2) clarify and track disease pathogenesis, (3) monitor short and long-term treatment effects, and (4) serve as a tool in testing of drugs that may be used in treatment of tinnitus.
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Affiliation(s)
- Anthony T Cacace
- The Neurosciences Institute and Advanced Imaging Research Center, Department of Neurology, Albany Medical College, Albany, NY, USA.
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Ocena skuteczności leczenia pacjentów z szumami usznymi za pomocą krioterapii ogólnoustrojowej. Otolaryngol Pol 2007; 61:801-4. [DOI: 10.1016/s0030-6657(07)70530-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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