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Kim YJ, Jeong IH, Ha JH, Kim YS, Sung S, Jang JH, Choung YH. The Suppression of Ubiquitin C-Terminal Hydrolase L1 Promotes the Transdifferentiation of Auditory Supporting Cells into Hair Cells by Regulating the mTOR Pathway. Cells 2024; 13:737. [PMID: 38727276 PMCID: PMC11083094 DOI: 10.3390/cells13090737] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2024] [Revised: 04/18/2024] [Accepted: 04/23/2024] [Indexed: 05/13/2024] Open
Abstract
In mammals, hearing loss is irreversible due to the lack of the regenerative capacity of the auditory epithelium. However, stem/progenitor cells in mammalian cochleae may be a therapeutic target for hearing regeneration. The ubiquitin proteasome system plays an important role in cochlear development and maintenance. In this study, we investigated the role of ubiquitin C-terminal hydrolase L1 (UCHL1) in the process of the transdifferentiation of auditory supporting cells (SCs) into hair cells (HCs). The expression of UCHL1 gradually decreased as HCs developed and was restricted to inner pillar cells and third-row Deiters' cells between P2 and P7, suggesting that UCHL1-expressing cells are similar to the cells with Lgr5-positive progenitors. UCHL1 expression was decreased even under conditions in which supernumerary HCs were generated with a γ-secretase inhibitor and Wnt agonist. Moreover, the inhibition of UCHL1 by LDN-57444 led to an increase in HC numbers. Mechanistically, LDN-57444 increased mTOR complex 1 activity and allowed SCs to transdifferentiate into HCs. The suppression of UCHL1 induces the transdifferentiation of auditory SCs and progenitors into HCs by regulating the mTOR pathway.
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Affiliation(s)
- Yeon Ju Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; (Y.J.K.); (J.H.H.); (Y.S.K.); (J.H.J.)
| | - In Hye Jeong
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Republic of Korea; (I.H.J.); (S.S.)
| | - Jung Ho Ha
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; (Y.J.K.); (J.H.H.); (Y.S.K.); (J.H.J.)
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Republic of Korea; (I.H.J.); (S.S.)
| | - Young Sun Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; (Y.J.K.); (J.H.H.); (Y.S.K.); (J.H.J.)
| | - Siung Sung
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Republic of Korea; (I.H.J.); (S.S.)
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; (Y.J.K.); (J.H.H.); (Y.S.K.); (J.H.J.)
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; (Y.J.K.); (J.H.H.); (Y.S.K.); (J.H.J.)
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Republic of Korea; (I.H.J.); (S.S.)
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Kim H, Choo OS, Ha J, Yang J, Jang JH, Park HY, Choung YH. Objective and subjective efficacy of hearing aids in patients with mild-to-moderate unilateral hearing loss: a prospective study. Eur Arch Otorhinolaryngol 2024; 281:1671-1681. [PMID: 37803218 DOI: 10.1007/s00405-023-08255-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2023] [Accepted: 09/20/2023] [Indexed: 10/08/2023]
Abstract
PURPOSE In patients with unilateral sensorineural hearing loss (USNHL), we explored both objective functional audiological gains and subjective satisfaction, indicating when a unilateral hearing aid is valuable. METHODS Thirty-seven patients with mild-to-moderate USNHL (mean pure-tone thresholds between 25 and 70 dB) were prescribed unilateral hearing aids. Functional gain, the aided speech discrimination score (SDS), the Hearing in Noise Test (HINT) score, and the sound localization test score were collected, and a questionnaire (the Hearing Handicap Inventory for the Elderly, HHIE) completed after 1, 2, and 3 months of hearing aid use. We classified the participants as having 'no handicap' (HHIE < 17), 'mild-to-moderate handicap' (17-42), and 'significant handicap' (> 42). RESULTS The decrease in handicap afforded by unilateral hearing aids was largest in the 'significant handicap' group (the HHIE total score fell from 59.1 to 37.2; P = 0.007). There were no between-group differences in either functional gain or the aided SDS. Only the 'significant handicap' group evidenced an improved HINT score; the composite signal-to-noise ratio (SNR) fell from - 1.5 to - 2.2 dB [S/N] (P = 0.023). The HHIE usefully indicated when a hearing aid alleviated the discomfort of USNHL; patients with unaided HHIE scores ≥ 20 evidenced significant decreases in the composite SNR (- 1.7 to - 2.0 dB [S/N]; P = 0.045). CONCLUSIONS When considering whether to prescribe a unilateral hearing aid for patients with mild-to-moderate USNHL, it is helpful to use the HHIE to evaluate discomfort. If the total score is ≥ 20, a hearing aid is appropriate.
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Affiliation(s)
- Hantai Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Konyang University College of Medicine, Daejeon, 35365, Republic of Korea
| | - Oak-Sung Choo
- Department of Otorhinolaryngology-Head and Neck Surgery, Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul, 07441, Republic of Korea
| | - Jungho Ha
- Department of Otolaryngology, Ajou University School of Medicine, 164 Worldcup-ro, Yeongtong-gu, Suwon, Gyeonggi-do, 16499, Republic of Korea
| | - Jisun Yang
- Department of Otolaryngology, Ajou University School of Medicine, 164 Worldcup-ro, Yeongtong-gu, Suwon, Gyeonggi-do, 16499, Republic of Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, 164 Worldcup-ro, Yeongtong-gu, Suwon, Gyeonggi-do, 16499, Republic of Korea
| | - Hun Yi Park
- Department of Otolaryngology, Ajou University School of Medicine, 164 Worldcup-ro, Yeongtong-gu, Suwon, Gyeonggi-do, 16499, Republic of Korea
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, 164 Worldcup-ro, Yeongtong-gu, Suwon, Gyeonggi-do, 16499, Republic of Korea.
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Ha J, Park H, Yang J, Jang JH, Park HY, Choung YH. Mechanism underlying and prevention of electrode migration in cochlear implants. Eur Arch Otorhinolaryngol 2024; 281:1597-1602. [PMID: 38070047 DOI: 10.1007/s00405-023-08346-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2023] [Accepted: 11/08/2023] [Indexed: 02/10/2024]
Abstract
PURPOSE We investigate the clinical manifestations, mechanisms, and methods of preventing electrode migration in Cochlear Implantation (CI) patients, based on our practical experience with this problem. STUDY DESIGN This is a retrospective study in a single center. METHODS We retrospectively reviewed electrode migration in 4 (0.75%) of 532 patients who underwent CI at our tertiary institution from January 2002 to December 2022. Pre- and post-operative pure-tone audiometry, word recognition score, aided functional gain test, and sound field speech intelligibility test were evaluated. RESULTS All four patients underwent CIs with the straight electrode type. The following events or symptoms were observed in the patients before confirming electrode migration: an increase in high-frequency thresholds during the post-operative aided functional gain test and a decline in scores on the sound field speech intelligibility test. Electrode migration was confirmed through transocular view X-ray or temporal bone computer tomography. Two patients showed coiled electrodes within the mastoid cavity; while in the others, the electrodes were observed to be floating inside the cavity. To prevent migration of electrodes due to these issues, we mixed bone paste collected during the drilling of the mastoid cavity with glue and used it to secure the electrodes in place. CONCLUSION Electrode migration can result in a decrease in hearing ability and may necessitate a revision surgery to adjust the electrode placement. The main factors affecting electrode placement include the position of electrode within the mastoid cavity and the elasticity of straight electrodes. It is important for surgeons to recognize the factors that increase the risk of electrode migration and to take preventative measures to reduce this risk.
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Affiliation(s)
- Jungho Ha
- Department of Otolaryngology, Ajou University School of Medicine, 164 World Cup-ro, Yeongtong-gu, Suwon, 16499, Gyeonggi-do, Republic of Korea
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
| | - Hannah Park
- Department of Otolaryngology, Ajou University School of Medicine, 164 World Cup-ro, Yeongtong-gu, Suwon, 16499, Gyeonggi-do, Republic of Korea
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
| | - Jisun Yang
- Department of Otolaryngology, Ajou University School of Medicine, 164 World Cup-ro, Yeongtong-gu, Suwon, 16499, Gyeonggi-do, Republic of Korea
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, 164 World Cup-ro, Yeongtong-gu, Suwon, 16499, Gyeonggi-do, Republic of Korea
| | - Hun Yi Park
- Department of Otolaryngology, Ajou University School of Medicine, 164 World Cup-ro, Yeongtong-gu, Suwon, 16499, Gyeonggi-do, Republic of Korea
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, 164 World Cup-ro, Yeongtong-gu, Suwon, 16499, Gyeonggi-do, Republic of Korea.
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea.
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Kim H, Park MK, Park SN, Cho HH, Choi JY, Lee CK, Lee IW, Moon IJ, Jung JY, Jung J, Lee KY, Oh JH, Park HJ, Seo JH, Song JJ, Ha J, Jang JH, Choung YH. Efficacy of the Bonebridge BCI602 for Adult Patients with Single-sided Deafness: A Prospective Multicenter Study. Otolaryngol Head Neck Surg 2024; 170:490-504. [PMID: 37811702 DOI: 10.1002/ohn.520] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2023] [Revised: 07/09/2023] [Accepted: 08/12/2023] [Indexed: 10/10/2023]
Abstract
OBJECTIVE To investigate the safety and efficacy of a novel active transcutaneous bone conduction implant (BCI) device for patients with single-sided deafness (SSD). STUDY DESIGN Prospective cohort study. SETTING Tertiary referral hospitals. METHODS This prospective multicenter study was conducted at 15 institutions nationwide. Thirty adult (aged ≥19 years) SSD patients were recruited. They underwent implantation of an active transcutaneous BCI device (Bonebridge BCI602). Objective outcomes included aided pure-tone thresholds, aided speech discrimination scores (SDSs), and the Hearing in Noise Test (HINT) and sound localization test results. The Bern Benefit in Single-Sided Deafness (BBSS) questionnaire, the Abbreviated Profile of Hearing Aid Benefit (APHAB) questionnaire, and the Tinnitus Handicap Inventory (THI) were used to measure subjective benefits. RESULTS The mean aided pure-tone threshold was 34.2 (11.3), mean (SD), dB HL at 500 to 4000 Hz. The mean total BBSS score was 27.5 (13.8). All APHAB questionnaire domain scores showed significant improvements: ease of communication, 33.6 (23.2) versus 22.6 (21.3), P = .025; reverberation, 44.8 (16.6) versus 32.8 (15.9), P = .002; background noise, 55.5 (23.6) versus 35.2 (18.1), P < .001; and aversiveness, 36.7 (22.8) versus 25.8 (21.4), P = .028. Moreover, the THI scores were significantly reduced [47.4 (30.1) versus 31.1 (27.0), P = .003]. Congenital SSD was a significant factor of subjective benefit (-11.643; 95% confidence interval: -21.946 to -1.340). CONCLUSION The BCI602 active transcutaneous BCI device can provide functional hearing gain without any adverse effects and is a feasible option for acquired SSD patients with long-term deafness.
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Affiliation(s)
- Hantai Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Konyang University College of Medicine, Daejeon, Korea
| | - Moo Kyun Park
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University College of Medicine, Seoul, Korea
| | - Shi Nae Park
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Hyong-Ho Cho
- Department of Otolaryngology-Head and Neck Surgery, Chonnam National University Medical School and Chonnam National University Hospital, Gwangju, Korea
| | - Jae Young Choi
- Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, Korea
| | - Chi Kyou Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Soonchunhyang University College of Medicine, Seoul Hospital, Seoul, Korea
| | - Il-Woo Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Pusan National University College of Medicine, Pusan National University Yangsan Hospital, Yangsan, Korea
| | - Il Joon Moon
- Department of Otorhinolaryngology-Head and Neck Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Jae Yun Jung
- Department of Otolaryngology-Head and Neck Surgery, Dankook University College of Medicine, Cheonan, Korea
| | - Jinsei Jung
- Department of Otorhinolaryngology, Yonsei University College of Medicine, Seoul, Korea
| | - Kyu-Yup Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, School of Medicine, Kyungpook National University, Daegu, Korea
| | - Jeong-Hoon Oh
- Department of Otorhinolaryngology-Head and Neck Surgery, Bucheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Bucheon, Korea
| | - Hong Ju Park
- Department of Otorhinolaryngology-Head and Neck Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Jae-Hyun Seo
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
| | - Jae-Jin Song
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Jungho Ha
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
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Jang JH, Ha J, Choo OS, Kang YS, Park HY, Choung YH. Factors Predicting Subjective Satisfaction for Successful Hearing Aid Adaptation. J Clin Med 2024; 13:398. [PMID: 38256531 PMCID: PMC10817049 DOI: 10.3390/jcm13020398] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 01/06/2024] [Accepted: 01/09/2024] [Indexed: 01/24/2024] Open
Abstract
(1) Background: For successful hearing aid (HA) use during daily life, an objective parameter reflecting the subjective satisfaction is required. We explored the aided hearing status, hearing in noise test (HINT) scores, and subjective outcomes to predict performance improvements in everyday living. (2) Methods: A total of 406 patients with hearing loss (HL) who were prescribed HAs were included and were divided into two groups according to the symmetricity of HL. The relationship between audiometric data and subjective questionnaires under unaided and aided (3 months) conditions were investigated. (3) Results: Patients with symmetric HL showed a significant HINT signal-to-noise ratio (SNR) change and significant increase in their subjective satisfaction questionnaire score under the bilateral HA condition. On the other hand, the HINT SNR change and subjective questionnaire score showed various significances according to the side of HA (better or worse hearing) in asymmetric HL HINT SNR and was significantly correlated with the subjective questionnaire score in symmetric HL patients and AHL patients with unilateral HA in their better ear. (4) Conclusions: The HINT SNR improvement after long-term HA use could be an effective tool for predicting the subjective satisfaction of HA use and HA validation.
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Affiliation(s)
- Jeong Hun Jang
- Department of Otorhinolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea
| | - Jungho Ha
- Department of Otorhinolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea
| | - Oak-Sung Choo
- Department of Otorhinolaryngology-Head and Neck Surgery, Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Chuncheon 24252, Republic of Korea
| | - Young Sook Kang
- Department of Otorhinolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea
| | - Hun Yi Park
- Department of Otorhinolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea
| | - Yun-Hoon Choung
- Department of Otorhinolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea
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Seriramulu VP, Suppiah S, Lee HH, Jang JH, Omar NF, Mohan SN, Ibrahim NSN, Azmi NHM, Buhari I, Ahmad U. Review of MR spectroscopy analysis and artificial intelligence applications for the detection of cerebral inflammation and neurotoxicity in Alzheimer's disease. Med J Malaysia 2024; 79:102-110. [PMID: 38287765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/31/2024]
Abstract
INTRODUCTION Magnetic resonance spectroscopy (MRS) has an emerging role as a neuroimaging tool for the detection of biomarkers of Alzheimer's disease (AD). To date, MRS has been established as one of the diagnostic tools for various diseases such as breast cancer and fatty liver, as well as brain tumours. However, its utility in neurodegenerative diseases is still in the experimental stages. The potential role of the modality has not been fully explored, as there is diverse information regarding the aberrations in the brain metabolites caused by normal ageing versus neurodegenerative disorders. MATERIALS AND METHODS A literature search was carried out to gather eligible studies from the following widely sourced electronic databases such as Scopus, PubMed and Google Scholar using the combination of the following keywords: AD, MRS, brain metabolites, deep learning (DL), machine learning (ML) and artificial intelligence (AI); having the aim of taking the readers through the advancements in the usage of MRS analysis and related AI applications for the detection of AD. RESULTS We elaborate on the MRS data acquisition, processing, analysis, and interpretation techniques. Recommendation is made for MRS parameters that can obtain the best quality spectrum for fingerprinting the brain metabolomics composition in AD. Furthermore, we summarise ML and DL techniques that have been utilised to estimate the uncertainty in the machine-predicted metabolite content, as well as streamline the process of displaying results of metabolites derangement that occurs as part of ageing. CONCLUSION MRS has a role as a non-invasive tool for the detection of brain metabolite biomarkers that indicate brain metabolic health, which can be integral in the management of AD.
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Affiliation(s)
- V P Seriramulu
- Universiti Putra Malaysia, Faculty of Medicine and Health Sciences, Department of Radiology, 43400 Serdang, Selangor, Malaysia
| | - S Suppiah
- Universiti Putra Malaysia, Faculty of Medicine and Health Sciences, Department of Radiology, 43400 Serdang, Selangor, Malaysia.
| | - H H Lee
- METLiT Inc., Seoul, Republic of Korea
| | - J H Jang
- METLiT Inc., Seoul, Republic of Korea
| | - N F Omar
- Universiti Putra Malaysia, Faculty of Medicine and Health Sciences, Department of Radiology, 43400 Serdang, Selangor, Malaysia
| | - S N Mohan
- Universiti Putra Malaysia, Faculty of Medicine and Health Sciences, Department of Psychiatry, 43400 Serdang, Selangor, Malaysia
| | - N S N Ibrahim
- Universiti Putra Malaysia, Faculty of Medicine and Health Sciences, Department of Radiology, 43400 Serdang, Selangor, Malaysia
| | - N H M Azmi
- Universiti Putra Malaysia, Faculty of Medicine and Health Sciences, Department of Radiology, 43400 Serdang, Selangor, Malaysia
| | - I Buhari
- Universiti Putra Malaysia, Faculty of Medicine and Health Sciences, Department of Radiology, 43400 Serdang, Selangor, Malaysia
| | - U Ahmad
- Bauchi State University, Faculty of Basic Medical Sciences, Department of Anatomy, Molecular Genetics Informatics, Gadau, Nigeria
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Lee YY, Ha J, Kim YS, Ramani S, Sung S, Gil ES, Choo OS, Jang JH, Choung YH. Abnormal Cholesterol Metabolism and Lysosomal Dysfunction Induce Age-Related Hearing Loss by Inhibiting mTORC1-TFEB-Dependent Autophagy. Int J Mol Sci 2023; 24:17513. [PMID: 38139347 PMCID: PMC10743727 DOI: 10.3390/ijms242417513] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2023] [Revised: 12/07/2023] [Accepted: 12/12/2023] [Indexed: 12/24/2023] Open
Abstract
Cholesterol is a risk factor for age-related hearing loss (ARHL). However, the effect of cholesterol on the organ of Corti during the onset of ARHL is unclear. We established a mouse model for the ARHL group (24 months, n = 12) and a young group (6 months, n = 12). Auditory thresholds were measured in both groups using auditory brainstem response (ABR) at frequencies of 8, 16, and 32 kHz. Subsequently, mice were sacrificed and subjected to histological analyses, including transmission electron microscopy (TEM), H&E, Sudan Black B (SBB), and Filipin staining, as well as biochemical assays such as IHC, enzymatic analysis, and immunoblotting. Additionally, mRNA extracted from both young and aged cochlea underwent RNA sequencing. To identify the mechanism, in vitro studies utilizing HEI-OC1 cells were also performed. RNA sequencing showed a positive correlation with increased expression of genes related to metabolic diseases, cholesterol homeostasis, and target of rapamycin complex 1 (mTORC1) signaling in the ARHL group as compared to the younger group. In addition, ARHL tissues exhibited increased cholesterol and lipofuscin aggregates in the organ of Corti, lateral walls, and spiral ganglion neurons. Autophagic flux was inhibited by the accumulation of damaged lysosomes and autolysosomes. Subsequently, we observed a decrease in the level of transcription factor EB (TFEB) protein, which regulates lysosomal biosynthesis and autophagy, together with increased mTORC1 activity in ARHL tissues. These changes in TFEB and mTORC1 expression were observed in a cholesterol-dependent manner. Treatment of ARHL mice with atorvastatin, a cholesterol synthesis inhibitor, delayed hearing loss by reducing the cholesterol level and maintaining lysosomal function and autophagy by inhibiting mTORC1 and activating TFEB. The above findings were confirmed using stress-induced premature senescent House Ear Institute organ of Corti 1 (HEI-OC1) cells. The findings implicate cholesterol in the pathogenesis of ARHL. We propose that atorvastatin could prevent ARHL by maintaining lysosomal function and autophagy by inhibiting mTORC1 and activating TFEB during the aging process.
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Affiliation(s)
- Yun Yeong Lee
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; (Y.Y.L.); (J.H.); (Y.S.K.); (S.R.); (S.S.); (J.H.J.)
| | - Jungho Ha
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; (Y.Y.L.); (J.H.); (Y.S.K.); (S.R.); (S.S.); (J.H.J.)
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Republic of Korea
| | - Young Sun Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; (Y.Y.L.); (J.H.); (Y.S.K.); (S.R.); (S.S.); (J.H.J.)
| | - Sivasubramanian Ramani
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; (Y.Y.L.); (J.H.); (Y.S.K.); (S.R.); (S.S.); (J.H.J.)
| | - Siung Sung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; (Y.Y.L.); (J.H.); (Y.S.K.); (S.R.); (S.S.); (J.H.J.)
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Republic of Korea
| | - Eun Sol Gil
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; (Y.Y.L.); (J.H.); (Y.S.K.); (S.R.); (S.S.); (J.H.J.)
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Republic of Korea
| | - Oak-Sung Choo
- Department of Otorhinolaryngology-Head and Neck Surgery, Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul 07441, Republic of Korea;
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; (Y.Y.L.); (J.H.); (Y.S.K.); (S.R.); (S.S.); (J.H.J.)
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; (Y.Y.L.); (J.H.); (Y.S.K.); (S.R.); (S.S.); (J.H.J.)
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Republic of Korea
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Ha J, Gu GY, Yeou SH, Kim H, Choo OS, Jang JH, Park HY, Choung YH. Determination of Tympanostomy Tube Types for Otitis Media with Effusion in Patients with Cleft Palate: Comparison between Paparella Type 1 and Type 2 Tubes. J Clin Med 2023; 12:6651. [PMID: 37892790 PMCID: PMC10607012 DOI: 10.3390/jcm12206651] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2023] [Revised: 09/30/2023] [Accepted: 10/19/2023] [Indexed: 10/29/2023] Open
Abstract
This study examined the effects of different types of tympanostomy tubes in pediatric patients undergoing cleft palate (CP) surgery in order to provide guidance for the proper insertion of tympanostomy tubes in the management of otitis media with effusion (OME). A total of 101 ears with middle ear effusion in 51 patients with CP were included in this study. Patients underwent palatoplasty and tympanostomy tube surgery at the same time. The type of tube inserted (Paparella type 1 or 2), the severity of CP, and types of palatoplasty surgeries were investigated. All patients were followed up for at least 6 months, and recurrence rates, complications, and reinsertion surgery were evaluated. The rate of OME recurrence after spontaneous tube extrusion was significantly higher in the type 1 group than in the type 2 group (44.3% vs. 19.4%, respectively, p = 0.016). Persistent eardrum perforation was more common in the type 2 group than in the type 1 group (41.9% vs. 12.9%, respectively, p = 0.001). The tube reinsertion rate was higher in the type 1 group than in the type 2 group (22.9% vs. 3.2%, respectively, p = 0.015). The tube reinsertion rate decreased to 8.6% in cases of palatoplasty with Sommerlad's technique, even with type 1 tube insertion, which was not significantly different from the reinsertion rate in the type 2 group (3.7%, p = 0.439). The Paparella type 1 tube would be a better choice in cases of palatoplasty performed using Sommerlad's technique, particularly considering the higher rate of persistent eardrum perforation after extrusion associated with the Paparella type 2 tube. Alternatively, a larger size type 2 tube may be considered in other surgeries to decrease the frequency of recurrence and tube reinsertion.
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Affiliation(s)
- Jungho Ha
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; (J.H.); (G.Y.G.); (S.H.Y.); (J.H.J.); (H.Y.P.)
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Republic of Korea; (H.K.); (O.-S.C.)
| | - Ga Young Gu
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; (J.H.); (G.Y.G.); (S.H.Y.); (J.H.J.); (H.Y.P.)
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Republic of Korea; (H.K.); (O.-S.C.)
| | - Se Hyun Yeou
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; (J.H.); (G.Y.G.); (S.H.Y.); (J.H.J.); (H.Y.P.)
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Republic of Korea; (H.K.); (O.-S.C.)
| | - Hantai Kim
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Republic of Korea; (H.K.); (O.-S.C.)
- Department of Otorhinolaryngology, Konyang University College of Medicine, Daejeon 35365, Republic of Korea
| | - Oak-Sung Choo
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Republic of Korea; (H.K.); (O.-S.C.)
- Department of Otorhinolaryngology-Head and Neck Surgery, Kangnam Sacred Heart Hospital, Hallym University College of Medicine, Seoul 07441, Republic of Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; (J.H.); (G.Y.G.); (S.H.Y.); (J.H.J.); (H.Y.P.)
| | - Hun Yi Park
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; (J.H.); (G.Y.G.); (S.H.Y.); (J.H.J.); (H.Y.P.)
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; (J.H.); (G.Y.G.); (S.H.Y.); (J.H.J.); (H.Y.P.)
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Republic of Korea; (H.K.); (O.-S.C.)
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Kim H, Ha J, Yeou SH, Jang JH, Park HY, Choung YH. What is the most important factor to preserve hearing in lateral semicircular canal fistula surgeries, fistula size or bony structure? Eur Arch Otorhinolaryngol 2023; 280:4419-4425. [PMID: 37014426 DOI: 10.1007/s00405-023-07958-2] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2022] [Accepted: 03/29/2023] [Indexed: 04/05/2023]
Abstract
PURPOSE Cholesteatoma on lateral semicircular canal (LSCC) fistula > 2 mm in size is likely to be unmanipulated due to the risk of sensorineural hearing loss. However, the matrix can be successfully removed without hearing loss when it is > 2 mm. The purpose of the study was to evaluate surgical experience over the past 10 years and to suggest the important factor for the hearing preservation in LSCC fistula surgeries. METHODS According to the fistula size and symptoms, 63 patients with LSCC fistula were grouped as follows: Type I (fistula < 2 mm), Type II (≥ 2 mm and < 4 mm without vertigo), Type III (≥ 2 mm and < 4 mm with vertigo), Type IV (≥ 4 mm), and Type V (any size fistula but with deafness at the initial visit). The cholesteatoma matrix was meticulously manipulated and removed by experienced surgeons. RESULTS Only two patients completely lost their hearing after surgery (4.5%). However, the loss was inevitable because their cholesteatomas were highly invasive and there was also facial nerve canal involvement; thus, the bony structure of the LSCC was already destroyed by the cholesteatoma. Unlike these two Type IV patients, Type I-III patients, and those with a fistula size < 4 mm, did not lose their sensorineural hearing. If the structure of the LSCC was maintained, hearing loss did not occur even if the fistula size ≥ 4 mm. CONCLUSIONS The preservation of the labyrinthine structure is more important than the defect size of the LSCC fistula. If the structure is intact, cholesteatoma matrices lying on the defect can be safely removed, even though the size of bony defect is large.
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Affiliation(s)
- Hantai Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Konyang University College of Medicine, Daejeon, 35365, Republic of Korea
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, 16499, Republic of Korea
| | - Jungho Ha
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, 16499, Republic of Korea
- Department of Otolaryngology, Ajou University School of Medicine, 16499, Suwon, Republic of Korea
| | - Se Hyun Yeou
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, 16499, Republic of Korea
- Department of Otolaryngology, Ajou University School of Medicine, 16499, Suwon, Republic of Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, 16499, Suwon, Republic of Korea
| | - Hun Yi Park
- Department of Otolaryngology, Ajou University School of Medicine, 16499, Suwon, Republic of Korea
| | - Yun-Hoon Choung
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, 16499, Republic of Korea.
- Department of Otolaryngology, Ajou University School of Medicine, 16499, Suwon, Republic of Korea.
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Ha J, Kim H, Gu GY, Song YJ, Jang JH, Park HY, Choung YH. Surgical Outcomes of Simultaneous Cochlear Implantation and Intracochlear Schwannoma Removal. Otolaryngol Head Neck Surg 2023; 169:660-668. [PMID: 36807253 DOI: 10.1002/ohn.300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 12/06/2022] [Accepted: 01/27/2023] [Indexed: 02/19/2023]
Abstract
OBJECTIVE Intracochlear schwannoma is very rare, and complete loss of hearing is inevitable after the removal of this tumor. Here, we discuss cochlear implantation (CI) performed simultaneously with the removal of an intracochlear schwannoma. STUDY DESIGN Retrospective single-center study. SETTING Tertiary medical institute. METHODS Simultaneous CI and intracochlear schwannoma removal were performed in 4 subjects. After subtotal cochleostomy, the tumors were removed meticulously, with preservation of the modiolus. A new slim modiolar electrode (Nucleus CI632) was placed in a manner that hugged the modiolus. The surgical outcomes of functional gain, word recognition score (WRS), sound localization, and hearing in noise and speech intelligibility tests were investigated. RESULTS Intracochlear schwannomas were removed successfully from the 4 patients, with no remnant tumor. The mean aided hearing threshold 6 months after surgery was 25.0 ± 1.8 dB, and the mean-aided WRS with a 60 dB stimulus was 36.0 ± 18.8% (range 16%-60%). The Categorical Auditory Performance (CAP) score of the 3 single-sided deafness patients under contralateral ear masking was 7. The CAP score of the patient with bilateral sensorineural hearing loss was 6, which improved from a preoperative score of 0. CONCLUSION When an intracochlear schwannoma does not completely invade the modiolus, CI with simultaneous tumor removal can be performed successfully, resulting in good hearing performance. A slim modiolar electrode can be placed stably at the modiolus after schwannoma removal.
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Affiliation(s)
- Jungho Ha
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
| | - Hantai Kim
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
- Department of Otorhinolaryngology-Head and Neck Surgery, Konyang University College of Medicine, Daejeon, Republic of Korea
| | - Ga Young Gu
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
| | - Young Jae Song
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Hun Yi Park
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
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11
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Lee SY, Choe G, Lee HS, Song YJ, Jang JH, Park MH. Sleep disturbance and dysregulation of circadian clock machinery in sudden sensorineural hearing loss. Acta Otolaryngol 2023; 143:692-698. [PMID: 37640054 DOI: 10.1080/00016489.2023.2244010] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2023] [Revised: 07/23/2023] [Accepted: 07/24/2023] [Indexed: 08/31/2023]
Abstract
BACKGROUND The cochlea contains a robust biological clock associated with auditory function, exhibiting diurnal sensitivity to noise or ototoxicity. OBJECTIVES We examined the relationship between disrupted circadian rhythm and altered expression of circadian clock genes in patients with sudden sensorineural hearing loss (SSNHL) and explored whether the circadian clock genes serve as prognostic biomarkers. MATERIAL AND METHODS Twelve patients with SSNHL were enrolled study group. Twelve people with normal hearing were enrolled voluntarily for comparison. Audiological evaluation was performed to evaluate hearing thresholds. Korean version of the Pittsburgh Sleep Quality Index Questionnaire was performed to evaluate sleep quality and patterns. Circadian clock genes including for PERI, PER2, PER3, CRYI, CRY2, CLOCK, ARNTL, CSNKIE, and TIMELESS expression in blood were evaluated using real-time quantitative PCR method. RESULTS Compared with healthy controls without hearing loss, most of the circadian clock genes were markedly downregulated, coupled with low sleep quality and disturbing patterns, in patients with SSNHL. Intriguingly, a weak correlation between hearing improvement following steroid treatment and altered levels of circadian clock genes was observed. CONCLUSIONS AND SIGNIFICANCE This study provides an additional basis for the relevance of disrupted circadian rhythm to SSNHL and suggests a possible prognostic biomarker for SSNHL treatment.
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Affiliation(s)
- Sang-Yeon Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University College of Medicine, Seoul, Korea
| | - Goun Choe
- Department of Otorhinolaryngology, Boramae Medical Center, Seoul Metropolitan Government-Seoul National University, Seoul, Korea
| | - Ho Sun Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University College of Medicine, Seoul, Korea
- Department of Otorhinolaryngology, Boramae Medical Center, Seoul Metropolitan Government-Seoul National University, Seoul, Korea
| | - Yong Jae Song
- Department of Otolaryngology, School of Medicine, Ajou University, Suwon, Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, School of Medicine, Ajou University, Suwon, Korea
| | - Min-Hyun Park
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University College of Medicine, Seoul, Korea
- Department of Otorhinolaryngology, Boramae Medical Center, Seoul Metropolitan Government-Seoul National University, Seoul, Korea
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12
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Kim H, Han JG, Park HY, Choung YH, Jang JH. Relationship Between Facial Bone Fractures and the Risk of Posttraumatic Complications: A Hypothesis on the Cushion Effect of the Facial Skeletons in Temporal Bone Fractures. J Korean Med Sci 2023; 38:e215. [PMID: 37431543 DOI: 10.3346/jkms.2023.38.e215] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Accepted: 03/21/2023] [Indexed: 07/12/2023] Open
Abstract
BACKGROUND This study investigated whether concomitant facial bone (FB) fractures reduce temporal bone (TB) injuries, such as posttraumatic facial palsy and vertigo, through an impact absorbing effect, so-called "cushion effect," in severe trauma patients. METHODS A total of 134 patients with a TB fracture were included. They were divided into two groups according to their concomitant facial fractures: group I (no FB fracture) and group II (FB fracture). We compared clinical characteristics, such as brain injury, trauma severity, and complications of TB fracture, between the two groups. RESULTS In group II, immediate facial palsy was more frequent (11.6% vs. 1.5% in group I), and the Injury Severity Score was higher (19.0 ± 5.9 vs. 16.7 ± 7.3, P = 0.020). Delayed facial palsy (12.3% in group I vs. 4.3% in group II) and posttraumatic vertigo (24.6% vs. 7.2%) occurred more often in group I. FB fractures significantly decreased the incidence of posttraumatic vertigo (odds ratio [OR], 0.276; 95% confidence interval [CI], 0.083-0.914). Intraventricular hemorrhage (OR, 20.958; 95% CI, 2.075-211.677), facial nerve canal injury (OR, 12.229; 95% CI, 2.465-60.670), and FB fractures (OR, 16.420; 95% CI, 1.298-207.738) increased the risk of immediate facial palsy. CONCLUSION Concomitant FB fractures reduced the risk of the occurrence of delayed facial palsy and posttraumatic vertigo in injured patients with TB fracture. Particularly, an anterior force may be reduced by the cushion effect of the bony fracture.
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Affiliation(s)
- Hantai Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Konyang University College of Medicine, Daejeon, Korea
| | - Jang Gyu Han
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Hun Yi Park
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea.
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Kim H, Ha J, Park HY, Choung YH, Jang JH. Efficacy and Safety of Co-Administered St. John's Wort and Ginkgo biloba Extracts in Patients with Subjective Tinnitus: A Preliminary Prospective Randomized Controlled Trial. J Clin Med 2023; 12:jcm12093261. [PMID: 37176699 PMCID: PMC10179387 DOI: 10.3390/jcm12093261] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 04/12/2023] [Accepted: 05/01/2023] [Indexed: 05/15/2023] Open
Abstract
It is widely accepted that extracts of St. John's wort (Hypericum perforatum) improve depressive symptoms, and tinnitus patients commonly presented with either mild depression or anxiety. We investigated whether co-administration of St. John's wort and Ginkgo biloba extracts can suppress tinnitus. Participants with subjective tinnitus aged 30-70 years were randomly assigned to the experimental (co-administration of St. John's wort and Ginkgo biloba extract; n = 20) or control (Ginkgo biloba extract only; n = 26) group for 12 weeks. Participants were blinded to the group assignments. After 12 weeks of treatment, no significant change in the minimum masking level on the tinnitogram was observed in either group. In the co-administration group, the Tinnitus Handicap Inventory (THI) score decreased from 34.7 (SD, 15.9) to 29.6 (16.0) (p = 0.102). However, the control group showed a significant decrease in THI score, from 30.5 (16.7) to 25.6 (17.1) (p = 0.046). Regarding the Short Form-36 Health Survey (SF-36), only the "Social Functioning" domain score changed significantly after extract co-administration, from 74.5 (21.5) to 83.9 (20.5) (p = 0.047). Co-administration of St. John's wort and Ginkgo biloba extracts did not improve the symptoms of subjective tinnitus compared to administration of Ginkgo biloba extract alone.
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Affiliation(s)
- Hantai Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Konyang University College of Medicine, Daejeon 35365, Republic of Korea
| | - Jungho Ha
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea
| | - Hun Yi Park
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea
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Hun Jang J, Cheol Kim Y, Lee JS, Ju Kim Y, Yeong Lee Y, Choo OS, Choung YH, Choung1 YH. Dexamethasone Effect on Sudden Hearing Loss is Validated in Stress-induced Animal Models: Hypothetical Study. J Int Adv Otol 2023; 19:10-15. [PMID: 36718030 PMCID: PMC9985073 DOI: 10.5152/iao.2023.21659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
Abstract
BACKGROUND Stress could be a contributing cause of sudden hearing loss. This study intended to develop an animal model of stress-induced sudden hearing loss and to evaluate the effects of dexamethasone. METHODS Two stress models (I and II) for rats were designed using various stressors and modified by adjusting the stress protocol to increase the threshold significantly. For the stress model with a significant increase in threshold after stress exposure, changes in cortisol levels according to stress exposure were measured. The threshold shift and the change in the cellular structure associated with stress exposure and dexamethasone administration were analyzed. RESULTS While hearing thresholds increased only at 16 kHz in rats of stress model I (n=10), the thresholds increased at 16 and 32 kHz in rats of stress model II (n=16). Cortisol level increased after stress exposure (P = .015) in stress model II. Among stress model II rats (stress only and stress+dexamethasone groups), the threshold shift at 16 kHz significantly decreased 1 day after dexamethasone injection in the stress+dexamethasone group (n=8). Histologically, the cochlear cellularity of the stress+dexamethasone group was more compact than that of the stressonly group (n=8). CONCLUSION Our preliminary study presented the development of an animal model of stress-induced sudden hearing loss and the positive results of steroids in terms of hearing recovery.
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Affiliation(s)
- Jeong Hun Jang
- Department of Otolaryngology, Ajou University Faculty of Medicine, Suwon, Korea
| | - Yeong Cheol Kim
- Department of Otolaryngology, Ajou University Faculty of Medicine, Suwon, Korea,Department of Biomedical Sciences, BK21 Plus Research Center for Biomedical Sciences, Ajou University Graduate Faculty of Medicine, Suwon, Korea,Department of Medical Sciences, Ajou University Graduate Faculty of Medicine, Suwon, Korea
| | - Jin-Sol Lee
- Department of Otolaryngology, Ajou University Faculty of Medicine, Suwon, Korea,Department of Biomedical Sciences, BK21 Plus Research Center for Biomedical Sciences, Ajou University Graduate Faculty of Medicine, Suwon, Korea,Department of Medical Sciences, Ajou University Graduate Faculty of Medicine, Suwon, Korea
| | - Yeon Ju Kim
- Department of Otolaryngology, Ajou University Faculty of Medicine, Suwon, Korea
| | - Yun Yeong Lee
- Department of Otolaryngology, Ajou University Faculty of Medicine, Suwon, Korea
| | - Oak-Sung Choo
- Department of Otolaryngology, Ajou University Faculty of Medicine, Suwon, Korea,Department of Medical Sciences, Ajou University Graduate Faculty of Medicine, Suwon, Korea
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University Faculty of Medicine, Suwon, Korea,Department of Biomedical Sciences, BK21 Plus Research Center for Biomedical Sciences, Ajou University Graduate Faculty of Medicine, Suwon, Korea,Department of Medical Sciences, Ajou University Graduate Faculty of Medicine, Suwon, Korea,Corresponding author: Yun-Hoon Choung, e-mail:
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Choo OS, Lee YY, Kim YS, Kim YJ, Lee DH, Kim H, Jang JH, Choung YH. Effect of statin on age-related hearing loss via drug repurposing. Biochim Biophys Acta Mol Cell Res 2022; 1869:119331. [PMID: 35963547 DOI: 10.1016/j.bbamcr.2022.119331] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2022] [Revised: 07/21/2022] [Accepted: 07/27/2022] [Indexed: 06/15/2023]
Abstract
Hearing loss in the elderly cause communication difficulties, decreased quality of life, isolation, loneliness and frustration. The aim of our study was to investigate the effect of drug repurposing candidates in aging mouse. The selected candidate drugs for age-related hearing loss (ARHL) included atorvastatin (AS) and sarpogrelate. Monotherapy or fixed dose combination (FDC) products were administered via oral gavage for 6 consecutive months. Auditory outcomes showed significant hearing preservation in AS-treated aging mice compared to aging control, especially in the early stages of ARHL in both 8 and 16 kHz frequencies. However, none of the FDC products were able to prevent ARHL regardless of AS involvement. In aging mice, damage and dysfunction of mitochondria was noted as well as reactive oxygen species overproduction leading to oxidative stress and intrinsic apoptosis. These processes of ARHL were significantly prevented with administration of AS. Normal structures of mitochondria were maintained, and antioxidant activity were proceeded by activation of HSF1/Sirt1 pathway. Our study suggests that AS is a promising drug repurposing candidate to delay the progression of ARHL.
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Affiliation(s)
- Oak-Sung Choo
- Department of Otolaryngology, Uijeongbu Eulji Medical Center, Uijeongbu 11749, Republic of Korea
| | - Yun Yeong Lee
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea
| | - Young Sun Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea
| | - Yeon Ju Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea
| | - Dong Ha Lee
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Republic of Korea
| | - Hantai Kim
- Department of Otorhinolaryngology, Konyang University College of Medicine, Daejeon 35365, Republic of Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Republic of Korea; Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Republic of Korea.
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Jang JH, Kim H, Choo O, Ha J, Mun HA, Park HY, Choung Y. Preliminary study to determine an optimal mode for favorable residual hearing at low frequencies: Full electrical stimulation, electric acoustic stimulation, and electrical complement. Laryngoscope Investig Otolaryngol 2022; 7:1129-1135. [PMID: 36000067 PMCID: PMC9392387 DOI: 10.1002/lio2.843] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 04/15/2022] [Accepted: 06/08/2022] [Indexed: 12/01/2022] Open
Abstract
Objective In this prospective study, each subject experienced three modes electric acoustic stimulation (EAS), full electrical stimulation (FES), and electrical complement (EC), and the performance of each mode and subject preference were evaluated. Methods Eight ears (seven patients) with successfully preserved residual hearing after cochlear implantation (CI) were included. EAS, FES, and EC programs were set up on each patient's device, and each mode was used for at least 1 h per day for a month. The Speech Intelligibility test, the Speech, Spatial and Qualities of Hearing Scale, and the Hearing in Noise test (HINT) results in each stimulation mode. Results The mean monosyllabic word score (EAS: 90.3 ± 4.0; FES: 81.2 ± 16.1) and the mean sentence score (EAS: 98.3 ± 1.7; FES: 95.0 ± 3.0) were significantly higher in the EAS mode than in the FES mode. The mean bisyllabic word score (EAS: 95.6 ± 5.6; EC: 90.1 ± 5.6) was higher in the EAS mode than in the EC mode. In HINT, the signal‐to‐noise ratios under the noise front (EAS: 4.7 ± 2.5; FES: 7.9 ± 4.4) and noise composite conditions (EAS: 4.2 ± 2.7; FES: 6.6 ± 4.0) were significantly smaller in the EAS mode than in the FES mode. After trials of the three modes, five subjects preferred EAS, one preferred EC, and two preferred FES. Conclusion Among the three stimulation modes, EAS produced slightly better results, and subjects generally preferred EAS (five of seven patients, 71.4%). The use of hearing aids before CI was considered an important factor in mode preference. FES may be preferred when CI was performed at a young age and subjects had little experience with hearing aids. However, adults may prefer EC over EAS if there was little or no hearing‐aid use before CI.
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Affiliation(s)
- Jeong Hun Jang
- Department of Otolaryngology Ajou University School of Medicine Suwon South Korea
| | - Hantai Kim
- Department of Otolaryngology Ajou University School of Medicine Suwon South Korea
| | - Oak‐Sung Choo
- Department of Otolaryngology Ajou University School of Medicine Suwon South Korea
| | - Jungho Ha
- Department of Otolaryngology Ajou University School of Medicine Suwon South Korea
| | - Hyoung Ah Mun
- Department of Otolaryngology Ajou University School of Medicine Suwon South Korea
| | - Hun Yi Park
- Department of Otolaryngology Ajou University School of Medicine Suwon South Korea
| | - Yun‐Hoon Choung
- Department of Otolaryngology Ajou University School of Medicine Suwon South Korea
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Moneke I, Ögütür E, Chatterjee S, Haberecker M, Jang JH, Fähndrich S, Senbaklavaci Ö, Faccioli E, Opitz I, Passlick B, Diederichs S, Jungraithmayr W. CD26-inhibition correlates with the absence of chronic lung allograft dysfunction and decreases fibroblast activity in vitro. Br J Surg 2022. [DOI: 10.1093/bjs/znac176.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
Abstract
Objective
Chronic lung allograft dysfunction (CLAD) limits the survival after lung transplantation (Tx). CLAD is characterized by progressive fibrosis of small airways and lung parenchyma. No effective therapy is available that reverses or prevents CLAD. CD26 is a molecule with enzymatic activity also playing a key role in the progression of fibrotic diseases. Here, we analyzed the inhibitory effect of CD26 on fibroblast activity in vitro and the role of CD26-inhibition on allograft rejection in lung transplant patients.
Methods
Profibrogenic mRNA and protein levels were analyzed in vitro on the CD26-expressing fibroblast cell line Wi-38 using RT-qPCR and Western blot. CD26 was inhibited by Vildagliptin. Migration and proliferation activity of activated fibroblasts were analyzed by Incucyte® and Celltiter-Glo®. Characteristics of patients undergoing lung Tx between 2004 and 2021 were reviewed. Lung biopsies were analyzed by immunohistochemistry (IHC) for CD26.
Results
In vitro, the expression of profibrogenic genes (αSMA, FAPα, IGFBP7, Collagen 3 and Fibronectin) was significantly reduced in activated lung fibroblasts by Vildagliptin treatment. Also, migration and proliferation activity were attenuated by Vildagliptin. In 221 patients analyzed, CLAD was absent in 34 patients treated with the CD26-inhibitor Sitagliptin vs. an incidence of 18% in patients without Sitagliptin intake (p=0.02). Five-year survival in patients on Sitagliptin was significantly improved vs. patients without CD26-inhibitor intake (80% vs. 58%, p=0.006). Likewise, the incidence of acute cellular rejection (ACR) was significantly reduced in patients on Sitagliptin (7% vs. 35%, p=0.01). IHC of patient lung biopsies showed expression of CD26 in perifibrotic areas of CLAD lesions. Additional clinical data from University Hospital Zurich and from University Hospital Padua confirmed the finding that Sitagliptin intake correlated with the absence of acute and chronic allograft rejection.
Conclusion
CD26-inhibition attenuates key pro-fibrotic mediators and fibroblast activity in vitro. Impressively, patients on CD26-inhibitor did not show any CLAD. Moreover, ACR was significantly reduced. Gliptins which are in routine clinical use for the treatment of type II diabetes therefore seem to have great potential to be repurposed for a novel clinical application against lung allograft rejection.
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Affiliation(s)
- I Moneke
- Department of Thoracic Surgery, University Medical Center Freiburg , Freiburg, Germany
| | - E Ögütür
- Department of Thoracic Surgery, University Medical Center Freiburg , Freiburg, Germany
| | - S Chatterjee
- Institute for Environmental Medicine, Perelmann School of Medicine, University of Pennsylvania , Philadelphia, USA
| | - M Haberecker
- Institute of Pathology, University Hospital Zurich , Zurich, Switzerland
| | - J H Jang
- Department of Thoracic Surgery, University Hospital Zurich , Zurich, Switzerland
| | - S Fähndrich
- Department of Pneumology, University Medical Center Freiburg , Freiburg, Switzerland
| | - Ö Senbaklavaci
- Department of Thoracic Surgery, University Medical Center Freiburg , Freiburg, Germany
| | - E Faccioli
- Department of Thoracic Surgery, University Hospital of Padua , Padua, Italy
- Department of Thoracic Surgery, University Hospital Zurich , Zurich, Switzerland
| | - I Opitz
- Department of Thoracic Surgery, University Hospital Zurich , Zurich, Switzerland
| | - B Passlick
- Department of Thoracic Surgery, University Medical Center Freiburg , Freiburg, Germany
| | - S Diederichs
- Department of Thoracic Surgery, University Medical Center Freiburg , Freiburg, Germany
- German Cancer Research Center RNA Biology & Cancer, , Heidelberg, Germany
| | - W Jungraithmayr
- Department of Thoracic Surgery, University Medical Center Freiburg , Freiburg, Germany
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18
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Jang JH, Choo OS, Kim H, Park HY, Choung YH. Comparison of surgical results between 'atticosinuplasty' and canal wall up mastoidectomy for early-stage cholesteatoma. Acta Otolaryngol 2022; 142:259-264. [PMID: 35297742 DOI: 10.1080/00016489.2022.2046290] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Abstract
BACKGROUND We devised a surgical technique called 'atticosinuplasty' (AS) for the treatment of early-stage cholesteatoma. OBJECTIVE This study analyzed the adequacy and applicability of AS compared to canal wall-up mastoidectomy (CWU) in patients treated for early-stage cholesteatoma. MATERIALS AND METHODS A total of 187 patients with either AS (n = 89) or CWU (n = 98) were compared in terms of postoperative hearing outcome, recurrence and re-operation rate, and radiologic outcome. RESULTS Hearing gain was significant in the AS group (p < 0.001) but not in the CWU group. Air conduction change, air-bone gap (ABG) change, and ABG closure did not significantly differ between the two groups. The frequencies of cholesteatoma recurrence and revision ossiculoplasty were also similar. Of the 32 patients in the AS group with only attic/sinus involvement preoperatively, 20 (62.5%) showed no haziness and 6 (18.8%) had haziness extending to the mastoid postoperatively. Among the 67 patients in the CWU group who had haziness extending to the mastoid preoperatively, in 54 (80.6%) there was no change postoperatively. CONCLUSIONS AND SIGNIFICANCE AS is a surgical technique worth trying in patients with early stage of attic/sinus cholesteatoma in terms of the rate of recurrence and hearing improvement.
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Affiliation(s)
- Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Oak-Sung Choo
- Department of Otolaryngology, Uijeongbu Eulji Medical Center, Eulji University, Uijeongbu, Republic of Korea
| | - Hantai Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Hun Yi Park
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea
- Bk21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
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Kim H, Park J, Choung YH, Jang JH, Ko J. Predicting speech discrimination scores from pure-tone thresholds-A machine learning-based approach using data from 12,697 subjects. PLoS One 2022; 16:e0261433. [PMID: 34972151 PMCID: PMC8719684 DOI: 10.1371/journal.pone.0261433] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2021] [Accepted: 12/02/2021] [Indexed: 11/18/2022] Open
Abstract
Diagnostic tests for hearing impairment not only determines the presence (or absence) of hearing loss, but also evaluates its degree and type, and provides physicians with essential data for future treatment and rehabilitation. Therefore, accurately measuring hearing loss conditions is very important for proper patient understanding and treatment. In current-day practice, to quantify the level of hearing loss, physicians exploit specialized test scores such as the pure-tone audiometry (PTA) thresholds and speech discrimination scores (SDS) as quantitative metrics in examining a patient’s auditory function. However, given that these metrics can be easily affected by various human factors, which includes intentional (or accidental) patient intervention, there are needs to cross validate the accuracy of each metric. By understanding a “normal” relationship between the SDS and PTA, physicians can reveal the need for re-testing, additional testing in different dimensions, and also potential malingering cases. For this purpose, in this work, we propose a prediction model for estimating the SDS of a patient by using PTA thresholds via a Random Forest-based machine learning approach to overcome the limitations of the conventional statistical (or even manual) methods. For designing and evaluating the Random Forest-based prediction model, we collected a large-scale dataset from 12,697 subjects, and report a SDS level prediction accuracy of 95.05% and 96.64% for the left and right ears, respectively. We also present comparisons with other widely-used machine learning algorithms (e.g., Support Vector Machine, Multi-layer Perceptron) to show the effectiveness of our proposed Random Forest-based approach. Results obtained from this study provides implications and potential feasibility in providing a practically-applicable screening tool for identifying patient-intended malingering in hearing loss-related tests.
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Affiliation(s)
- Hantai Kim
- Ajou University Hospital, Suwon, South Korea
- Department of Otolaryngology, School of Medicine, Ajou University, Suwon, South Korea
| | - JaeYeon Park
- School of Integrated Technology, College of Engineering, Yonsei University, Seoul, South Korea
| | - Yun-Hoon Choung
- Ajou University Hospital, Suwon, South Korea
- Department of Otolaryngology, School of Medicine, Ajou University, Suwon, South Korea
| | - Jeong Hun Jang
- Ajou University Hospital, Suwon, South Korea
- Department of Otolaryngology, School of Medicine, Ajou University, Suwon, South Korea
- * E-mail: (JHJ); (Jk)
| | - JeongGil Ko
- School of Integrated Technology, College of Engineering, Yonsei University, Seoul, South Korea
- * E-mail: (JHJ); (Jk)
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20
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Kim H, Ha J, Lee JH, Jang JH, Park HY, Choung YH. Early management for traumatic benign paroxysmal positional vertigo in traumatically injured patients. Injury 2022; 53:198-203. [PMID: 34366105 DOI: 10.1016/j.injury.2021.07.042] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 06/20/2021] [Accepted: 07/26/2021] [Indexed: 02/02/2023]
Abstract
OBJECTIVES The purpose of this study was to identify the clinical features of posttraumatic benign paroxysmal positional vertigo (t-BPPV) in traumatically injured patients, investigating the effectiveness of the early diagnosis and management including canalith repositioning procedures (CRPs). PATIENTS AND METHODS The subjects of the present study were 74 patients who were hospitalized in the Trauma Center, Ajou University Hospital. We investigated the relationship between injury mechanisms and t-BPPV. Patients with t-BPPV were categorized into mild (typical BPPV) and severe (bilateral, recurrent, or persistent) types. RESULTS Of the 74 patients, 41 were diagnosed with t-BPPV. Nineteen were mild and 22 were severe types. 'A fall' (36%) and 'pedestrian car accident' (32%) were common as the injury mechanisms provoking severe t-BPPV. In the severe t-BPPV group, they were hospitalized longer (as median value, 20 days in the severe group vs. 10 days in the mild group, P = 0.004), stayed longer in intensive care unit (3 days vs. 0 days, P = 0.016), and needed more days until the BPPV management (13.5 days vs. 6 days, P = 0.021). Major trauma (the Injury Severity Score >15) patients had a longer time to implementation of the first CRPs (10 days in major trauma and 3 days in minor trauma patients, P = 0.019). CONCLUSIONS Severity of trauma and longer duration of ICU treatment were factors delaying BPPV management. This delay could negatively affect the progress of t-BPPV. Diagnostic and therapeutic maneuvers including CRPs should be performed as early as possible, even in severely injured patients.
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Affiliation(s)
- Hantai Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea; Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea.
| | - Jungho Ha
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea; Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea.
| | - Ju Ho Lee
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea.
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea.
| | - Hun Yi Park
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea.
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea; Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea.
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21
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Kim H, Ha J, Gil ES, Jang JH, Park HY, Choung YH. Selection of the optimal first ear for sequential bilateral cochlear implantation in children. Ear Nose Throat J 2021:1455613211064012. [PMID: 34898304 DOI: 10.1177/01455613211064012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVES When there is a difference in hearing on both ears, where to perform the first cochlear implantation (CI) becomes an important issue. The purpose of the study was to evaluate which ear should be chosen for the first implantation in sequential bilateral CI with a long inter-implant period. METHODS The study population consisted of 34 severe-to-profound sensorineural hearing loss pediatrics with the inter-implant period of ≥3 years between the first CI (CI-1) and the second CI (CI-2) before the age of 19 (mean of inter-implant period: 7.1-year). The patients were classified into Group A (CI-1 was performed on the ear with better hearing), Group B (CI-1 on the ear with worse hearing), or Group C (symmetrical hearing in both ears). Speech intelligibility test results were compared between the groups. RESULTS The monosyllabic word scores of CI-1 were excellent in Groups A (91.7±7.9%) and B (92.5±3.6%) but slightly lower in Group C (85.7±14.9%) before the second implantation (P = .487). At 3 years after the second implantation, all groups demonstrated excellent scores in the bilateral CI condition (95.9±3.0% in Group A; 99.1±.8% in Group B; 97.5±2.9% in Group C, P = .600). However, when the patients were tested in using CI-2 only in Groups A and B after using bilateral CI for 3 years, the scores were inconsistent in Group A (79.6±23.9%; range: 22.2-94.4%), while those were higher and more constant in Group B (92.9±4.8%; 86.8-100.0%). CONCLUSIONS The first CI is strongly recommended to perform on a worse hearing ear if they had different hearing levels between ears. Even with the first CI on a worse hearing ear, its performance never deteriorates. In addition, if they receive the second CI several years later, it will be likely that the second one functions better.
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Affiliation(s)
- Hantai Kim
- Department of Otolaryngology, 37977Ajou University School of Medicine, Suwon, Republic of Korea
- Department of Medical Sciences, 37977Ajou University Graduate School of Medicine, Suwon, Republic of Korea
| | - Jungho Ha
- Department of Otolaryngology, 37977Ajou University School of Medicine, Suwon, Republic of Korea
- Department of Medical Sciences, 37977Ajou University Graduate School of Medicine, Suwon, Republic of Korea
| | - Eun Sol Gil
- Department of Medical Sciences, 37977Ajou University Graduate School of Medicine, Suwon, Republic of Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, 37977Ajou University School of Medicine, Suwon, Republic of Korea
| | - Hun Yi Park
- Department of Otolaryngology, 37977Ajou University School of Medicine, Suwon, Republic of Korea
| | - Yun-Hoon Choung
- Department of Otolaryngology, 37977Ajou University School of Medicine, Suwon, Republic of Korea
- Department of Medical Sciences, 37977Ajou University Graduate School of Medicine, Suwon, Republic of Korea
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22
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O'Sullivan MJ, Jang JH, Panariti A, Bedrat A, Ijpma G, Lemos B, Park JA, Lauzon AM, Martin JG. Airway Epithelial Cells Drive Airway Smooth Muscle Cell Phenotype Switching to the Proliferative and Pro-inflammatory Phenotype. Front Physiol 2021; 12:687654. [PMID: 34295265 PMCID: PMC8290262 DOI: 10.3389/fphys.2021.687654] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2021] [Accepted: 05/03/2021] [Indexed: 12/13/2022] Open
Abstract
The increased mass of airway smooth muscle (ASM) in the airways of asthmatic patients may contribute to the pathology of this disease by increasing the capacity for airway narrowing. Evidence for the airway epithelium as a participant in ASM remodeling is accruing. To investigate mechanisms by which airway epithelial cells induce ASM cell (ASMC) proliferation, we have employed a co-culture model to explore markers of ASMC proliferative phenotype. Co-culture with epithelial cells led to incorporation of bromodeoxyuridine into ASMCs, indicating augmented proliferation and an associated increase in mRNA of the pro-proliferative co-transcription factor Elk1. Although the mitogen heparin-binding epidermal growth factor (HB-EGF) was augmented in the co-culture supernatant, the ASMC epidermal growth factor receptor (EGFR), an effector of HB-EGF induced proliferation, did not mediate epithelial-induced proliferation. The co-culture increased the expression of ASMC mRNA for the pro-inflammatory cytokines IL-6 and IL-8 as well as the pro-proliferative microRNA miR-210. The transcriptional repressor Max-binding protein (Mnt), a putative target of miR-210, was transcriptionally repressed in co-cultured ASMCs. Together, these data indicate that the airway epithelium-induced proliferative phenotype of ASMCs is not driven by EGFR signaling, but rather may be dependent on miR210 targeting of tumor suppressor Mnt.
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Affiliation(s)
- M J O'Sullivan
- Meakins-Christie Laboratories, McGill University Health Centre, Montreal, QC, Canada.,T.H. Chan School of Public Health, Harvard University, Boston, MA, United States
| | - J H Jang
- Meakins-Christie Laboratories, McGill University Health Centre, Montreal, QC, Canada
| | - A Panariti
- Meakins-Christie Laboratories, McGill University Health Centre, Montreal, QC, Canada
| | - A Bedrat
- T.H. Chan School of Public Health, Harvard University, Boston, MA, United States
| | - G Ijpma
- Meakins-Christie Laboratories, McGill University Health Centre, Montreal, QC, Canada
| | - B Lemos
- T.H. Chan School of Public Health, Harvard University, Boston, MA, United States
| | - J A Park
- T.H. Chan School of Public Health, Harvard University, Boston, MA, United States
| | - A M Lauzon
- Meakins-Christie Laboratories, McGill University Health Centre, Montreal, QC, Canada
| | - J G Martin
- Meakins-Christie Laboratories, McGill University Health Centre, Montreal, QC, Canada
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23
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Kim YJ, Lee JS, Kim H, Jang JH, Choung YH. Gap Junction-Mediated Intercellular Communication of cAMP Prevents CDDP-Induced Ototoxicity via cAMP/PKA/CREB Pathway. Int J Mol Sci 2021; 22:6327. [PMID: 34199197 PMCID: PMC8231879 DOI: 10.3390/ijms22126327] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2021] [Revised: 06/07/2021] [Accepted: 06/10/2021] [Indexed: 02/06/2023] Open
Abstract
In the cochlea, non-sensory supporting cells are directly connected to adjacent supporting cells via gap junctions that allow the exchange of small molecules. We have previously shown that the pharmacological regulation of gap junctions alleviates cisplatin (CDDP)-induced ototoxicity in animal models. In this study, we aimed to identify specific small molecules that pass through gap junctions in the process of CDDP-induced auditory cell death and suggest new mechanisms to prevent hearing loss. We found that the cyclic adenosine monophosphate (cAMP) inducer forskolin (FSK) significantly attenuated CDDP-induced auditory cell death in vitro and ex vivo. The activation of cAMP/PKA/CREB signaling was observed in organ of Corti primary cells treated with FSK, especially in supporting cells. Co-treatment with gap junction enhancers such as all-trans retinoic acid (ATRA) and quinoline showed potentiating effects with FSK on cell survival via activation of cAMP/PKA/CREB. In vivo, the combination of FSK and ATRA was more effective for preventing ototoxicity compared to either single treatment. Our study provides the new insight that gap junction-mediated intercellular communication of cAMP may prevent CDDP-induced ototoxicity.
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Affiliation(s)
- Yeon Ju Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea; (Y.J.K.); (H.K.); (J.H.J.)
| | - Jin-Sol Lee
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Korea;
| | - Hantai Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea; (Y.J.K.); (H.K.); (J.H.J.)
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea; (Y.J.K.); (H.K.); (J.H.J.)
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea; (Y.J.K.); (H.K.); (J.H.J.)
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Korea;
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24
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Kim YJ, Choo OS, Lee JS, Jang JH, Woo HG, Choung YH. BCL2 Interacting Protein 3-like/NIX-mediated Mitophagy Plays an Important Role in the Process of Age-related Hearing Loss. Neuroscience 2020; 455:39-51. [PMID: 33346118 DOI: 10.1016/j.neuroscience.2020.12.005] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Revised: 12/03/2020] [Accepted: 12/05/2020] [Indexed: 01/06/2023]
Abstract
Clearance of dysfunctional mitochondria via mitophagy is essential for cell survival and cochlear functions. However, it is not clear which genes are significantly involved in this process. Here, we investigated the changes in mitophagy and mitophagy-associated genes in mouse auditory cells to determine a possible correlation between mitophagy and age-related hearing loss (ARHL). Here, we show that most transcripts associated with mitophagy were downregulated in an age-dependent manner. We identified one significant differentially expressed gene associated with mitophagy, BCL2 interacting protein 3-like (BNIP3L)/NIX. Mitophagy-inhibited cells with BNIP3L/NIX knockdown showed hyperresponsiveness to oxidative stress resulting in cell senescence with increased levels of TOMM20 and LC3B. Overexpression of BNIP3L/NIX promotes the degradation of TOMM20 and LC3B during premature cell senescence. In conclusion, BNIP3L/NIX may play an important role in mitochondria degradation maintaining cochlear cell homeostasis during the aging process of hearing.
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Affiliation(s)
- Yeon Ju Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Oak-Sung Choo
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea; Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
| | - Jin-Sol Lee
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea; Department of Biomedical Sciences, BK21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Hyun Goo Woo
- Department of Biomedical Sciences, BK21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea; Department of Physiology, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea; Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea; Department of Biomedical Sciences, BK21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea.
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25
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Son JW, Choi SH, Jang JH, Koh JT, Oh WM, Hwang YC, Lee BN. Irisin promotes odontogenic differentiation and angiogenic potential in human dental pulp cells. Int Endod J 2020; 54:399-412. [PMID: 33089893 DOI: 10.1111/iej.13435] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 10/19/2020] [Accepted: 10/19/2020] [Indexed: 12/31/2022]
Abstract
AIM To determine whether irisin, a newly discovered myokine that links exercise-induced and metabolic homeostasis, is able to promote odontogenic differentiation and angiogenesis in human dental pulp cells (HDPCs). METHODOLOGY Cell viability in the presence of irisin was measured. Real-time PCR and Western blot analysis were performed to evaluate the expression levels of irisin, odontogenic and angiogenic markers. The involvement of mitogen-activated protein kinase (MAPK) and the protein kinase B (Akt) signalling pathway was evaluated by Western blot. To evaluate mineralization nodule formation, alkaline phosphatase (ALP) staining and alizarin red S staining were performed. Scratch wound assays were performed to evaluate the effects of irisin on cell migration. The data were analysed using one-way analysis of variance (anova) followed by Tukey post hoc test and Student's t-test. Statistical significance was considered at P < 0.05. RESULTS Irisin significantly promoted odontogenic differentiation as evidenced by formation of mineralized nodules, induction of ALP activity and upregulation of odontogenic and angiogenic markers (P < 0.05). Scratch wound assays revealed that irisin significantly increased migration of HDPCs (P < 0.05). Phosphorylation of both MAPK and Akt was increased by irisin. MAPK and Akt inhibitors inhibited mineralization, cell migration and the increased expression of odontogenic and angiogenic markers. CONCLUSIONS Irisin promoted odontogenic differentiation and mineralization and has the potential for angiogenesis through activation of the MAPK and Akt signalling pathways in HDPCs.
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Affiliation(s)
- J W Son
- Department of Conservative Dentistry, School of Dentistry, Dental Science Research Institute, Chonnam National University, Gwangju, Korea
| | - S H Choi
- Department of Conservative Dentistry, School of Dentistry, Dental Science Research Institute, Chonnam National University, Gwangju, Korea
| | - J H Jang
- Department of Conservative Dentistry, School of Dentistry, Kyung Hee University, Seoul, Korea
| | - J T Koh
- Department of Pharmacology and Dental Therapeutics, Hard-tissue Biointerface Research Center, School of Dentistry, Dental Science Research Institute, Chonnam National University, Gwangju, Korea
| | - W M Oh
- Department of Conservative Dentistry, School of Dentistry, Dental Science Research Institute, Chonnam National University, Gwangju, Korea
| | - Y C Hwang
- Department of Conservative Dentistry, School of Dentistry, Dental Science Research Institute, Chonnam National University, Gwangju, Korea
| | - B N Lee
- Department of Conservative Dentistry, School of Dentistry, Dental Science Research Institute, Chonnam National University, Gwangju, Korea
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26
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Lee YY, Kim YJ, Gil ES, Kim H, Jang JH, Choung YH. Type 1 Diabetes Induces Hearing Loss: Functional and Histological Findings in An Akita Mouse Model. Biomedicines 2020; 8:biomedicines8090343. [PMID: 32932780 PMCID: PMC7555388 DOI: 10.3390/biomedicines8090343] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2020] [Revised: 09/09/2020] [Accepted: 09/09/2020] [Indexed: 11/16/2022] Open
Abstract
The relationship between type 1 diabetes and hearing loss is not well known, although based on many pathological studies, type 2 diabetes induced hearing loss is associated with microcirculation problems in the inner ear. The purpose of this study was to investigate the correlation between type 1 diabetes and hearing loss through hearing function and immunohistochemical analyses using type 1 diabetic Akita or wild-type (WT) mice. The Akita mice had a significant increase in hearing thresholds, blood glucose, and insulin tolerance compared to WT mice. Histological analysis showed that the loss of cells and damage to mitochondria in the spiral ganglion neurons of Akita mice were significantly increased compared to WT. Also, the stria vascularis showed decreased thickness, loss of intermediate cells, and disturbance in blood capillary shape in the Akita mice. Moreover, a reduction in type I, II, and IV fibrocytes and Na+/K+-ATPase α1 expression in spiral ligament was also observed. Cleaved caspase-3 expression was highly expressed in spiral ganglion neurons. In conclusion, hearing loss in type 1 diabetes is caused not only by ion imbalance and blood flow disorders of cochlear endolymph, but through the degenerative nervous system via apoptosis-mediated cell death.
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Affiliation(s)
- Yun Yeong Lee
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea; (Y.Y.L.); (Y.J.K.); (E.S.G.); (H.K.); (J.H.J.)
| | - Yeon Ju Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea; (Y.Y.L.); (Y.J.K.); (E.S.G.); (H.K.); (J.H.J.)
| | - Eun Sol Gil
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea; (Y.Y.L.); (Y.J.K.); (E.S.G.); (H.K.); (J.H.J.)
- Department of Biomedical Science, Ajou University Graduate School of Medicine, Suwon 16499, Korea
| | - Hantai Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea; (Y.Y.L.); (Y.J.K.); (E.S.G.); (H.K.); (J.H.J.)
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea; (Y.Y.L.); (Y.J.K.); (E.S.G.); (H.K.); (J.H.J.)
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea; (Y.Y.L.); (Y.J.K.); (E.S.G.); (H.K.); (J.H.J.)
- Department of Biomedical Science, Ajou University Graduate School of Medicine, Suwon 16499, Korea
- Correspondence: ; Tel.: +82-31-219-5263; Fax: +82-31-219-5264
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Lee YY, Choo OS, Kim YJ, Gil ES, Jang JH, Kang Y, Choung YH. Atorvastatin prevents hearing impairment in the presence of hyperlipidemia. Biochim Biophys Acta Mol Cell Res 2020; 1867:118850. [PMID: 32918982 DOI: 10.1016/j.bbamcr.2020.118850] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2020] [Revised: 09/01/2020] [Accepted: 09/04/2020] [Indexed: 02/07/2023]
Abstract
It is known that hyperlipidemia is a risk factor for sensorineural hearing loss. However, the biological mechanisms underlying hyperlipidemia and hearing impairment have not been completely elucidated in the cochlea. Based on our previous study of human subjects, elderly people taking drugs for hyperlipidemia showed better hearing than those not taking any medications. We hypothesized that drugs for hyperlipidemia, such as statins, may have the potential to prevent hearing impairment. The aim of this study was to investigate the correlation between hyperlipidemia and hearing impairment and the hearing preservation effect of atorvastatin using a hyperlipidemic mouse model with diet-induced obesity (DIO). Here, we demonstrate that DIO mice had a significant hearing impairment as well as increased levels of reactive oxygen species (ROS) and hair cell death due to reduced levels of pAKT and superoxide dismutase 2 (SOD2). However, these changes were significantly prevented by atorvastatin. Oxidative stress-induced intrinsic apoptosis was decreased by the high expression of Nrf2 and antioxidant genes, which improved mitochondrial function and ROS via activation of the PI3K-pAKT pathway by atorvastatin. Therefore, atorvastatin has the potential to prevent hearing impairment via redox balance in the presence of hyperlipidemia.
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Affiliation(s)
- Yun Yeong Lee
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Gyunggi-do 443-749, Republic of Korea
| | - Oak-Sung Choo
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Gyunggi-do 443-749, Republic of Korea
| | - Yeon Ju Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Gyunggi-do 443-749, Republic of Korea
| | - Eun Sol Gil
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Gyunggi-do 443-749, Republic of Korea; Department of Biomedical Science, Ajou University Graduate School of Medicine, Suwon, Gyunggi-do 443-749, Republic of Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Gyunggi-do 443-749, Republic of Korea
| | - Yup Kang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Gyunggi-do 443-749, Republic of Korea; Department of Physiology, Ajou University School of Medicine, Suwon, Gyunggi-do 443-749, Republic of Korea.
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Gyunggi-do 443-749, Republic of Korea; Department of Biomedical Science, Ajou University Graduate School of Medicine, Suwon, Gyunggi-do 443-749, Republic of Korea.
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Lee MY, Kim YC, Jang J, Jung JY, Choi H, Jang JH, Choung YH. Dexamethasone delivery for hearing preservation in animal cochlear implant model: continuity, long-term release, and fast release rate. Acta Otolaryngol 2020; 140:713-722. [PMID: 32449405 DOI: 10.1080/00016489.2020.1763457] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Abstract
Background: Clinically, steroids have been used for hearing preservation both topically and systemically during cochlear implantation.Objective: This study compared steroid efficacy for hearing preservation among different types of delivery modes using an animal experiment.Materials and methods: For 76 guinea pigs, topical and systemic delivery methods, four pump types with different infusion rates, delivery durations, and total steroid amounts were used. Threshold changes of 8, 16, and 32 kHz after dummy electrode insertion were evaluated at 1 and 4 weeks and compared among delivery method and pump types. Inflammatory response in the cochlea was histologically compared.Results: For topical delivery groups, long-term release showed advantages in preserving hearing. Systemic delivery groups showed smaller threshold shifts than control group in all frequencies (p > .05). In short-term low dose application, compared to topical delivery, systemic delivery showed advantage in hearing preservation at both time point. However, others fail to show significant difference between two methods. Histologically, inflammatory response in the scala tympani at the basal turn was less in systemic delivery, especially in high dose and long-term.Conclusion and significance: The difference of hearing preservation was not obvious between two delivery methods. Higher dose and longer duration might have advantages in hearing preservation.
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Affiliation(s)
- Min Young Lee
- Department of Otolaryngology, Dankook University School of Medicine, Cheonan, South Korea
| | - Young Cheol Kim
- Department of Otorhinolaryngology, Ajou University School of Medicine, Suwon, South Korea
| | - Jongmoon Jang
- Department of Robotics Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, South Korea
| | - Jae Yun Jung
- Department of Otolaryngology, Dankook University School of Medicine, Cheonan, South Korea
| | - Hongsoo Choi
- Department of Robotics Engineering, Daegu Gyeongbuk Institute of Science and Technology (DGIST), Daegu, South Korea
| | - Jeong Hun Jang
- Department of Otorhinolaryngology, Ajou University School of Medicine, Suwon, South Korea
| | - Yun-Hoon Choung
- Department of Otorhinolaryngology, Ajou University School of Medicine, Suwon, South Korea
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Cho SD, Jang JH, Kim H, Cho YS, Kim Y, Koo JW, Song JJ. Earmold Foreign Bodies in the Middle Ear Necessitating Surgical Removal: Why Otology Specialists Should Screen Candidates for Hearing Aids. Clin Exp Otorhinolaryngol 2020; 14:235-239. [PMID: 32882785 PMCID: PMC8111396 DOI: 10.21053/ceo.2020.00850] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2020] [Accepted: 08/25/2020] [Indexed: 11/22/2022] Open
Affiliation(s)
- Sung-Dong Cho
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Hantai Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Yang-Sun Cho
- Department of Otorhinolaryngology-Head and Neck Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Yoonjoong Kim
- Department of Otolaryngology-Head and Neck Surgery, Chungnam National University College of Medicine, Daejeon, Korea
| | - Ja-Won Koo
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Jae-Jin Song
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seongnam, Korea
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Jang JH, Kim H, Choo OS, Park HY, Choung YH. Changes in Vestibular Symptoms and Function After Cochlear Implantation: Relevant Factors and Correlations With Residual Hearing. Clin Exp Otorhinolaryngol 2020; 14:69-75. [PMID: 32526819 PMCID: PMC7904426 DOI: 10.21053/ceo.2019.01851] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Accepted: 03/05/2020] [Indexed: 11/22/2022] Open
Abstract
Objectives The aim of this study was to evaluate vestibular function loss after cochlear implantation (CI) and the relationship between vestibular function and hearing changes. Methods Seventy-five patients with CI were enrolled and divided into those with normal preoperative caloric function (group I) and those with a normal preoperative waveform in cervical vestibular evoked myogenic potential (c-VEMP) testing (group II). The relationship between hearing and changes in the vestibular system was analyzed preoperatively and at 3 and 6 months postoperatively. Results In group I, unilateral weakness on the implanted side was detected in five (7.7%) and eight (12.3%) patients at 3 and 6 months post-CI, respectively. By 3 months post-CI, the total slow-phase velocity (SPV; warm and cold stimulations) was significantly different between the implanted and non-implanted sides (P=0.011), and the shift in total SPV from pre- to post-CI was significantly correlated with the average hearing threshold at 6 months post-CI. In group II, an abnormal c-VEMP was detected on the implanted side in six patients (16.2%) at 3 months post-CI, and in six patients (16.2%) at 6 months post-CI. Significant changes were noticed in the P1 and N1 amplitude at 3 months postCI (P=0.027 and P=0.019, respectively). Conclusion Vestibular function and residual hearing function should be afforded equal and simultaneous consideration in terms of preservation.
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Affiliation(s)
- Jeong Hun Jang
- Department of Otorhinolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Hantai Kim
- Department of Otorhinolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Oak-Sung Choo
- Department of Otorhinolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Hun Yi Park
- Department of Otorhinolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Yun-Hoon Choung
- Department of Otorhinolaryngology, Ajou University School of Medicine, Suwon, Korea.,BK21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon, Korea
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Cho NH, Jang JH. Future Directions of Optical Coherence Tomography in Otology: A Morphological and Functional Approach. Clin Exp Otorhinolaryngol 2020; 13:85-86. [PMID: 32434305 PMCID: PMC7248606 DOI: 10.21053/ceo.2020.00031] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2020] [Accepted: 01/18/2020] [Indexed: 11/22/2022] Open
Affiliation(s)
- Nam Hyun Cho
- Department of Otolaryngology and Head-Neck Surgery, Harvard Medical School, Boston, MA, USA.,Eaton-Peabody Laboratories, Massachusetts Eye and Ear, Boston, MA, USA
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
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Kim H, Choo OS, Park K, Gu GY, Park SH, Jang JH, Park HY, Choung YH. Hearing aids are still beneficial to patients, even if they have a low speech discrimination. Eur Arch Otorhinolaryngol 2020; 277:2987-2994. [PMID: 32390083 DOI: 10.1007/s00405-020-06018-3] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2020] [Accepted: 04/26/2020] [Indexed: 11/24/2022]
Abstract
PURPOSE A speech discrimination score (SDS) is a predictor for the successful use of hearing aids (HAs). This study is to evaluate the efficacy of HAs in patients with a low or poor SDS. METHODS We enrolled 186 ears using HAs, with an unaided SDS ≤ 64%. They were categorized into four groups by their unaided SDS: 0-16% for Group 1, 20-32% for Group 2, 36-48% for Group 3, and 52-64% for Group 4. Aided SDS was measured 1, 3, 6, and 12 months after the use. The Hearing In Noise Test (HINT), the Hearing Handicap Inventory for the Elderly (HHIE), and the International Outcome Inventory for Hearing Aids (IOI-HA) were assessed. RESULTS The SDS increased by 27.4% (12.0 to 39.4%) in Group 1, 26.4% (26.9 to 53.3%) in Group 2, 24.6% (42.2 to 66.8%) in Group 3, and 10.5% (59.5% to 70.0%) in Group 4. HINT composite scores significantly decreased from 22.5 to 15.1 in Group 1, 9.4 to 7.0 in Group 2, and 4.4 to 2.4 in Group 4. Total HHIE score changed from 48.2 to 24.2 in Group 1, 64.0 to 32.8 in Group 2, 37.1 to 16.6 in Group 3, and 55.8 to 40.1 in Group 4 (P < 0.05 in Groups 2, 3, and 4). CONCLUSION In patients with a low SDS, a significant increase in SDS was achieved after the use of HAs, and subjective satisfaction was also acceptable. Low SDS might not be a contraindication for HAs.
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Affiliation(s)
- Hantai Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea.,Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
| | - Oak-Sung Choo
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea.,Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
| | - Kyeongyeon Park
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Ga Young Gu
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Sung-Hee Park
- Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea.,BK21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Hun Yi Park
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea. .,Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea. .,BK21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea.
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Kim YC, Kim H, Kim YS, Jung SK, Park IY, Choung YH, Jang JH. Objective Verification of Acute Tinnitus and Validation of Efficacy of Systemic Steroids in Rats. J Korean Med Sci 2020; 35:e81. [PMID: 32242342 PMCID: PMC7131900 DOI: 10.3346/jkms.2020.35.e81] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/19/2019] [Accepted: 02/02/2020] [Indexed: 11/20/2022] Open
Abstract
BACKGROUND This study was performed to identify acute tinnitus and evaluate the efficacy of steroids for noise-induced acute tinnitus by measuring the gap-prepulse inhibition of the acoustic startle (GPIAS) value in an animal model. METHODS Nineteen rats (the noise group [n = 7] and the noise + dexamethasone [DEX] group [n = 12]) were exposed to narrow-band noise centered at 16 kHz from a sound generator for 4 hours. The noise + DEX group received intraperitoneal steroid administration daily for 5 days (1.5 mg/kg/day) after completing noise exposure. Auditory brainstem response and GPIAS value were measured just prior to, and 1 day after noise exposure and on days 1 and 10 days after completing steroid administration. The changes in cochlear structure were evaluated by histological analysis. RESULTS The threshold shift was checked 1 and 10 days after intraperitoneal steroid injection, and no differences in threshold shift were observed between the two groups in each frequency except for 32 kHz 1 day after steroid injection. The mean GPIAS value in the noise + DEX group (36.4% ± 14.1%) was significantly higher than that in the noise group (16.4% ± 18.8%) 10 days after intraperitoneal steroid administration (P = 0.017). There were no pathological changes associated with noise trauma in the two groups as determined on hematoxylin and eosin and immunohistochemical staining. CONCLUSION An acute tinnitus model with minimal structural changes by noise exposure was set up, and used to verify tinnitus objectively by measuring the GPIAS value. Steroid therapy for control of tinnitus was validated in this animal model.
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Affiliation(s)
- Yeong Cheol Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
- Department of Biomedical Sciences, BK21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon, Korea
| | - Heejin Kim
- Department of Otorhinolaryngology Head and Neck Surgery, Dongtan Sacred Heart Hospital, Hallym University College of Medicine, Hwaseong, Korea
| | - Young Seon Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Seo Kyung Jung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
- Department of Biomedical Sciences, BK21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon, Korea
| | - Il Yong Park
- Department of Biomedical Engineering, College of Medicine, Dankook University, Cheonan, Korea
| | - Yun Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
- Department of Biomedical Sciences, BK21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon, Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea.
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Kim BJ, Oh DY, Han JH, Oh J, Kim MY, Park HR, Seok J, Cho SD, Lee SY, Kim Y, Carandang M, Kwon IS, Lee S, Jang JH, Choung YH, Lee S, Lee H, Hwang SM, Choi BY. Significant Mendelian genetic contribution to pediatric mild-to-moderate hearing loss and its comprehensive diagnostic approach. Genet Med 2020; 22:1119-1128. [PMID: 32203226 DOI: 10.1038/s41436-020-0774-9] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2019] [Revised: 02/26/2020] [Accepted: 02/27/2020] [Indexed: 11/09/2022] Open
Abstract
PURPOSE Timely diagnosis and identification of etiology of pediatric mild-to-moderate sensorineural hearing loss (SNHL) are both medically and socioeconomically important. However, the exact etiologic spectrum remains uncertain. We aimed to establish a genetic etiological spectrum, including copy-number variations (CNVs) and efficient genetic testing pipeline, of this defect. METHODS A cohort of prospectively recruited pediatric patients with mild-to-moderate nonsyndromic SNHL from 2014 through 2018 (n = 110) was established. Exome sequencing, multiplex ligation-dependent probe amplification (MLPA), and nested customized polymerase chain reaction (PCR) for exclusion of a pseudogene, STRCP, from a subset (n = 83) of the cohort, were performed. Semen analysis was also performed to determine infertility (n = 2). RESULTS Genetic etiology was confirmed in nearly two-thirds (52/83 = 62.7%) of subjects, with STRC-related deafness (n = 29, 34.9%) being the most prevalent, followed by MPZL2-related deafness (n = 9, 10.8%). This strikingly high proportion of Mendelian genetic contribution was due particularly to the frequent detection of CNVs involving STRC in one-third (27/83) of our subjects. We also questioned the association of homozygous continuous gene deletion of STRC and CATSPER2 with deafness-infertility syndrome (MIM61102). CONCLUSION Approximately two-thirds of sporadic pediatric mild-to-moderate SNHL have a clear Mendelian genetic etiology, and one-third is associated with CNVs involving STRC. Based on this, we propose a new guideline for molecular diagnosis of these children.
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Affiliation(s)
- Bong Jik Kim
- Department of Otolaryngology-Head and Neck Surgery, Chungnam National University College of Medicine, Daejeon, Korea.,Brain Research Institute, Chungnam National University College of Medicine, Daejeon, Korea
| | - Doo-Yi Oh
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Jin Hee Han
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Jayoung Oh
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Min Young Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Hye-Rim Park
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Jungirl Seok
- Department Otolaryngology-Head and Neck Surgery, National Cancer Center, Goyang, Korea.,Department of Biomedical Engineering, College of Medicine, Seoul National University, Seoul, Korea
| | - Sung-Dong Cho
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Sang-Yeon Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Yoonjoong Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Marge Carandang
- Department of Otorhinolaryngology-Head and Neck Surgery, East Avenue Medical Center, Metro Manila, Philippines
| | - In Sun Kwon
- Chungnam National University Hospital Clinical Trials Center, Daejeon, Korea
| | | | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Sejoon Lee
- Department of Pathology, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Hakmin Lee
- Department of Urology, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Sang Mee Hwang
- Department of Laboratory Medicine, Seoul National University College of Medicine, Seoul, Korea.,Department of Laboratory Medicine, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Byung Yoon Choi
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea. .,Sensory Organ Research Institute, Seoul National University Medical Research Center, Seoul, Korea.
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Jeon B, Lee J, Jeon D, Kim P, Jang JH, Wijesinghe RE, Jeon M, Kim J. Functional assessment of moisture influenced cadaveric tympanic membrane using phase shift-resolved optical Doppler vibrography. J Biophotonics 2020; 13:e201900202. [PMID: 31670908 DOI: 10.1002/jbio.201900202] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/22/2019] [Revised: 10/16/2019] [Accepted: 10/29/2019] [Indexed: 06/10/2023]
Abstract
An elevated relative moisture in the external ear canal and middle ear cavity may predispose to chronic otorrhea and related infections along with abnormal tympanic membrane (TM) vibration patterns. Therefore, phase shift-resolved optical Doppler vibrography (ODV) was used for vibration assessments of moisture influenced cadaveric TM. ODV was applied to generate time resolved cross-sectional and volumetric vibrographs of a cadaveric TM, driven acoustically at several frequencies. In order to analyze the effect of moisture on TM, homogenous moisture conditions were provided by soaking the cadaveric TM specimens in 1× phosphate buffer saline with a pH of 7.4. The TM specimen was exposed to a rapidly switchable frequency generator during the ODV image acquisition. The experiment was conducted for 3 hours and the cadaveric TM was exposed to each frequency with an interval of 30 minutes. Acquired phase shift-resolved ODV assessments revealed a depth dependent vibration tendency between the applied frequencies, along with a decline in the moisture level of the cadaveric TM specimen. Thus, the ODV method can aid our understanding of sound conduction in the middle ear, thus supporting the diagnosis of TM diseases.
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Affiliation(s)
- Byeonggyu Jeon
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu, Republic of Korea
| | - Jaeyul Lee
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu, Republic of Korea
| | - Deokmin Jeon
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu, Republic of Korea
| | - Pilun Kim
- Institute of Biomedical Engineering, School of Medicine, Kyungpook National University, Daegu, Republic of Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, School of Medicine, Ajou University, Gyeongsan, Republic of Korea
| | - Ruchire Eranga Wijesinghe
- Department of Biomedical Engineering, College of Engineering, Kyungil University, Gyeongsan, Republic of Korea
| | - Mansik Jeon
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu, Republic of Korea
| | - Jeehyun Kim
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu, Republic of Korea
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Kim H, An JY, Choo OS, Jang JH, Park HY, Choung YH. Cochlear Implantation via the Transmeatal Approach in an Adolescent with Hunter Syndrome-Type II Mucopolysaccharidosis. J Audiol Otol 2019; 25:49-54. [PMID: 31813213 PMCID: PMC7835431 DOI: 10.7874/jao.2019.00325] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 10/21/2019] [Indexed: 11/22/2022] Open
Abstract
Type II mucopolysaccharidosis (MPS II) commonly known as Hunter syndrome, is a rare X-linked lysosomal storage disorder caused by iduronate-2-sulfatase deficiency, which in turn causes otorhinolaryngological manifestations, including sensorineural hearing loss (SNHL). Previously, the median survival age of patients with MPS was approximately 13.4 years. However, in the era of enzyme replacement therapy and other multidisciplinary care modalities, the life expectancy has increased. Herein, we report a rare case of an adolescent with MPS II who underwent SNHL treatment with cochlear implantation (CI). Based on unexpected findings of mastoid emissary veins and overgrowth of the vessels around the temporal bone, CI was performed using the transmeatal approach instead of the conventional transmastoid method, to avoid damage to the vessels. The average hearing threshold after CI was 35 dB and no surgical complications were encountered. Adolescent MPS II may present vessel abnormalities, which can reduce the success rate of surgery. In patients with MPS II with SNHL, CI should be performed under careful monitoring of vessel overgrowth. Moreover, with regard to feasibility of CI in adolescent patients with MPS II with SNHL, surgical techniques such as the transmeatal approach should be selected based on adequate assessment of the case.
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Affiliation(s)
- Hantai Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea.,Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Korea
| | - Jun Young An
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Oak-Sung Choo
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea.,Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Hun Yi Park
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea.,Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Korea.,BK21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon, Korea
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Jang J, Kim J, Kim YC, Kim S, Chou N, Lee S, Choung Y, Kim S, Brugger J, Choi H, Jang JH. A 3D Microscaffold Cochlear Electrode Array for Steroid Elution. Adv Healthc Mater 2019; 8:e1900379. [PMID: 31532887 DOI: 10.1002/adhm.201900379] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Revised: 09/04/2019] [Indexed: 11/05/2022]
Abstract
In cochlear implants, the electrode insertion trauma during surgery can cause damage residual hearing. Preserving the residual hearing is an important challenge and the localized administration of drugs, such as steroids, is one of the most promising ways, but remains a challenge. Here, a microscaffold cochlear electrode array (MiSCEA) consisting of a microfabricated flexible electrode array and a 3D microscaffold for steroid reservoir is reported. The MiSCEA without loaded drug is tested by measuring the electrically evoked auditory brainstem response of the cochlea in guinea pigs (n = 4). The scaffold is then coated with steroid (dexamethasone) encapsulated in polylactic-co-glycolic acid and the continuous release of the steroid into artificial perilymph during six weeks is monitored. The steroid-containing scaffolds are then implanted into guinea pigs (n = 4) and threshold shifts are analyzed for four weeks by measuring the acoustically evoked auditory brainstem response. The threshold shifts tend to be lower in the group implanted with the steroid-containing MiSCEAs. The feasibility of 3D MiSCEA opens up the development of potential next-generation cochlear electrode with improved steroid release dynamics into cochlea.
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Affiliation(s)
- Jongmoon Jang
- Department of Robotics EngineeringDaegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 Republic of Korea
- DGIST‐ETH Microrobot Research CenterDGIST Daegu 42988 Republic of Korea
- Microsystem LaboratoryÉcole Polytechnique Fédérale de Lausanne (EPFL) Lausanne CH‐1015 Switzerland
| | - Jin‐young Kim
- Department of Robotics EngineeringDaegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 Republic of Korea
- DGIST‐ETH Microrobot Research CenterDGIST Daegu 42988 Republic of Korea
| | - Yeong Cheol Kim
- Department of OtolaryngologyAjou University School of Medicine Suwon 16499 Republic of Korea
- Department of Biomedical SciencesBK21 Plus Research Center for Biomedical SciencesAjou University Graduate School of Medicine Suwon 16499 Republic of Korea
| | - Sangwon Kim
- Department of Robotics EngineeringDaegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 Republic of Korea
- DGIST‐ETH Microrobot Research CenterDGIST Daegu 42988 Republic of Korea
| | - Namsun Chou
- Department of Robotics EngineeringDaegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 Republic of Korea
| | - Seungmin Lee
- Department of Robotics EngineeringDaegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 Republic of Korea
- DGIST‐ETH Microrobot Research CenterDGIST Daegu 42988 Republic of Korea
| | - Yun‐Hoon Choung
- Department of OtolaryngologyAjou University School of Medicine Suwon 16499 Republic of Korea
- Department of Biomedical SciencesBK21 Plus Research Center for Biomedical SciencesAjou University Graduate School of Medicine Suwon 16499 Republic of Korea
| | - Sohee Kim
- Department of Robotics EngineeringDaegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 Republic of Korea
| | - Juergen Brugger
- Microsystem LaboratoryÉcole Polytechnique Fédérale de Lausanne (EPFL) Lausanne CH‐1015 Switzerland
| | - Hongsoo Choi
- Department of Robotics EngineeringDaegu Gyeongbuk Institute of Science and Technology (DGIST) Daegu 42988 Republic of Korea
- DGIST‐ETH Microrobot Research CenterDGIST Daegu 42988 Republic of Korea
| | - Jeong Hun Jang
- Department of OtolaryngologyAjou University School of Medicine Suwon 16499 Republic of Korea
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Jang JH, Kim H, Mun HA, Choo OS, Park HY, Ha EJ, Choung YH. Can radiological measurements of cochlear nerve parameters predict cochlear implant outcome? Our experience in 87 ears. Clin Otolaryngol 2019; 44:1142-1146. [PMID: 31442002 DOI: 10.1111/coa.13419] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2019] [Revised: 07/30/2019] [Accepted: 08/18/2019] [Indexed: 11/28/2022]
Affiliation(s)
- Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Hantai Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Hyung Ah Mun
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Oak Sung Choo
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Hun Yi Park
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Eun Ju Ha
- Department of Radiology, Ajou University School of Medicine, Suwon, Korea
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea.,Bk21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine Suwon, Suwon, Korea
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Jang JH, Choo OS, Kim H, Yi Park H, Choung YH. Round window membrane visibility related to success of hearing preservation in cochlear implantation. Acta Otolaryngol 2019; 139:618-624. [PMID: 31066597 DOI: 10.1080/00016489.2019.1609701] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
Objectives: This study was designed to evaluate the relationship between the degree of round window membrane (RWM) exposure and hearing outcome. Materials and methods: Forty-six ears with cochlear implantation (CI) were enrolled. The degree of RWM exposure was divided into Grade I (<25%), Grade II (25-50%), and Grade III (>50%). The hearing outcomes were evaluated at 1.5 and 12 months postoperatively. Results: Twenty-seven ears were Grade I, 13 were Grade II, and 6 were Grade III. RW approach was used in all ears of Grades II and III and 20 ears of Grade I and cochleostomy was used in 7 ears of Grade I. The pattern of bony overhang was multidirectional in 41 ears. Threshold shift significantly decreased proportional to the increase of RWM exposure after CI. The mean RWM exposure was 32.1 ± 24.4% in ears with more than partial preservation (n = 17), and 13.3 ± 11.7% in the other ears (n = 6) at 12 months post-CI (p = .061). Age at CI differed significantly between ears that had more than partial preservation and the other ears at 1.5 months post-CI. Conclusions and significance: Degree of RWM exposure and age at CI might be factors predicting hearing outcome after CI using the RW approach.
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Affiliation(s)
- Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Oak-Sung Choo
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Hantai Kim
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Hun Yi Park
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
- Ajou University Graduate School of Medicine, Bk21 Plus Research Center for Biomedical Sciences, Suwon, Korea
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40
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Jang JH, Oh J, Han JH, Park HR, Kim BJ, Lee S, Kim MY, Lee S, Oh DY, Choung YH, Choi BY. Identification of a Novel Frameshift Variant of POU3F4 and Genetic Counseling of Korean Incomplete Partition Type III Subjects Based on Detailed Genotypes. Genet Test Mol Biomarkers 2019; 23:423-427. [PMID: 31063410 DOI: 10.1089/gtmb.2018.0296] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Aim: The aim of this study was to report a novel POU Class 3 Homeobox 4 (POU3F4) variant and to provide further guidance on genetic counseling for incomplete partition (IP) type III families in the Korean population by showing two new contrasting cases in terms of genotypes and inheritance. Materials and Methods: Two consecutively recruited hearing-impaired probands with seemingly nonsyndromic features and their biological mothers were included in this study. Sanger sequencing and quantitative polymerase chain reaction (PCR) assays were performed for POU3F4. Results: A novel frameshift variant of POU3F4, c.852delC (p.Ile285Serfs*3), was identified in one of the patients. This mutation is predicted to truncate the protein within the POU homeodomain, resulting in the complete loss of the last nucleus localization signal. The proband's biological mother was also shown to be a carrier of this c.852delC (p.Ile285Serfs*3) mutant allele. A de novo genomic deletion on chromosome Xq21.2 was confirmed in another subject via quantitative PCR. This subject's biological mother, however, was not a carrier of this deletion. This indicates that the large upstream deletion of POU3F4 in the second proband occurred de novo. This finding is compatible with the previously proposed tendency for a high de novo rate of large genomic deletions involving the X-linked deafness-2 (DFNX2) locus. Conclusion: This study adds a novel, probably pathogenic POU3F4 truncation variant to the literature and provides guidance toward effective genetic counseling for IP III subjects based on more frequent de novo occurrence of POU3F4 deletions than POU3F4 point variants.
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Affiliation(s)
- Jeong Hun Jang
- 1 Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Jayoung Oh
- 2 Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Jin Hee Han
- 2 Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Hye-Rim Park
- 2 Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Bong Jik Kim
- 3 Department of Otolaryngology-Head and Neck Surgery, Chungnam National University College of Medicine, Daejeon, Korea
| | - Sejoon Lee
- 4 Precision Medicine Center, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Min Young Kim
- 2 Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Seungmin Lee
- 2 Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Doo-Yi Oh
- 2 Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea
| | - Yun-Hoon Choung
- 1 Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Byung Yoon Choi
- 2 Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea.,5 Sensory Organ Research Institute, Seoul National University Medical Research Center, Seoul, Korea
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41
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Seonwoo H, Kim SW, Shin B, Jang KJ, Lee M, Choo OS, Choi MJ, Kim J, Lim KT, Jang JH, Chung JH, Choung YH. Latent stem cell-stimulating therapy for regeneration of chronic tympanic membrane perforations using IGFBP2-releasing chitosan patch scaffolds. J Biomater Appl 2019; 34:198-207. [PMID: 31060420 DOI: 10.1177/0885328219845082] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Hoon Seonwoo
- 1 Department of Industrial Machinery Engineering, College of Life Sciences and Natural Resources, Sunchon National University, Suncheon, Republic of Korea
| | - Seung Won Kim
- 2 Department of Burns and Plastic Surgery, Affiliated Hospital of Yanbian University, Yanji, Jilin, P. R. China
| | - Beomyong Shin
- 3 Department of Biomedical Sciences, BK21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
| | - Kyoung-Je Jang
- 4 Department of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul, Republic of Korea
| | - Myungchul Lee
- 4 Department of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul, Republic of Korea
| | - Oak-Sung Choo
- 5 Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea.,6 Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
| | - Mi-Jin Choi
- 3 Department of Biomedical Sciences, BK21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
| | - Jangho Kim
- 7 Department of Rural and Biosystems Engineering, Chonnam National University, Gwangju, Republic of Korea
| | - Ki-Taek Lim
- 8 Department of Biosystems Engineering, College of Agricultural and Life Sciences, Kangwon National University, Chuncheon, Republic of Korea
| | - Jeong Hun Jang
- 5 Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea
| | - Jong Hoon Chung
- 4 Department of Biosystems & Biomaterials Science and Engineering, Seoul National University, Seoul, Republic of Korea.,9 Research Institute of Agriculture and Life Sciences, Seoul National University, Seoul, Republic of Korea
| | - Yun-Hoon Choung
- 3 Department of Biomedical Sciences, BK21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea.,5 Department of Otolaryngology, Ajou University School of Medicine, Suwon, Republic of Korea.,6 Department of Medical Sciences, Ajou University Graduate School of Medicine, Suwon, Republic of Korea
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42
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Choi MJ, Kang H, Lee YY, Choo OS, Jang JH, Park SH, Moon JS, Choi SJ, Choung YH. Cisplatin-Induced Ototoxicity in Rats Is Driven by RIP3-Dependent Necroptosis. Cells 2019; 8:E409. [PMID: 31052605 PMCID: PMC6562419 DOI: 10.3390/cells8050409] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2019] [Revised: 04/25/2019] [Accepted: 04/30/2019] [Indexed: 12/22/2022] Open
Abstract
Cisplatin-induced early-onset ototoxicity is linked to hearing loss. The mechanism by which cisplatin causes ototoxicity remains unclear. The purpose of this study was to identify the involvement of receptor-interacting protein kinase (RIP)3-dependent necroptosis in cisplatin-induced ototoxicity in vitro and in vivo. Sprague-Dawley rats (SD, 8 week) were treated via intraperitoneal (i.p.) injection with cisplatin (16 mg/kg for 1 day), and their hearing thresholds were measured by the auditory brainstem response (ABR) method. Hematoxylin and eosin (H & E) staining, immunohistochemistry, and western blots were performed to determine the effect of cisplatin-induced ototoxicity on cochlear morphology. Inhibitor experiments with necrostatin 1 (Nec-1) and Z-VAD were also performed in HEI-OC1 cell line. H&E stains revealed that the necroptotic changes were increased in the organ of Corti (OC) and spiral ganglion neurons (SGNs). Moreover, immunohistochemistry and western blot analysis showed that cisplatin treatment increased the protein levels of RIP3 in both OCs and SGNs. The treatment of Nec-1, a selective RIP1 inhibitor, resulted in markedly suppression of cisplatin-induced cell death in HEI-OC1 cells, whereas Z-VAD treatment did not change the cisplatin-induced cell death. Our results suggest that RIP3-dependent necroptosis was substantial in cisplatin-induced ototoxicity; inner cochlear regions, the OCs, and SGNs were especially sensitive to necroptosis.
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Affiliation(s)
- Mi-Jin Choi
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea.
- Bk21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Korea.
| | - Hyunsook Kang
- Department of Otolaryngology-Head and Neck Surgery, Cheonan Hospital, Soonchunhyang University College of Medicine, Cheonan 31151, Korea.
| | - Yun Yeong Lee
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea.
- Bk21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Korea.
| | - Oak-Sung Choo
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea.
- Bk21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Korea.
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea.
- Bk21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Korea.
| | - Sung-Hee Park
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea.
- Bk21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Korea.
| | - Jong-Seok Moon
- Soonchunhyang Institute of Medi-bio Science, Soonchunhyang University, Cheonan 31151, Korea.
| | - Seong Jun Choi
- Department of Otolaryngology-Head and Neck Surgery, Cheonan Hospital, Soonchunhyang University College of Medicine, Cheonan 31151, Korea.
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, Suwon 16499, Korea.
- Bk21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, Suwon 16499, Korea.
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43
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Kim YJ, Kim K, Lee YY, Choo OS, Jang JH, Choung YH. Downregulated UCHL1 Accelerates Gentamicin-Induced Auditory Cell Death via Autophagy. Mol Neurobiol 2019; 56:7433-7447. [PMID: 31041655 DOI: 10.1007/s12035-019-1598-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2018] [Accepted: 04/02/2019] [Indexed: 01/02/2023]
Abstract
The clinical use of aminoglycoside antibiotics is partly limited by their ototoxicity. The pathogenesis of aminoglycoside-induced ototoxicity still remains unknown. Here, RNA-sequencing was conducted to identify differentially expressed genes in rat cochlear organotypic cultures treated with gentamicin (GM), and 232 and 43 genes were commonly up- and downregulated, respectively, at day 1 and 2 after exposure. Ubiquitin carboxyl-terminal hydrolase isozyme L1 (Uchl1) was one of the downregulated genes whose expression was prominent in spiral ganglion cells (SGCs), lateral walls, as well as efferent nerve terminal and nerve fibers. We further investigated if a deficit of Uchl1 in organotypic cochlea and the House Ear Institute-Organ of Corti 1 (HEI-OC1) cells accelerates ototoxicity. We found that a deficit in Uchl1 accelerated GM-induced ototoxicity by showing a decreased number of SGCs and nerve fibers in organotypic cochlear cultures and HEI-OC1 cells. Furthermore, Uchl1-depleted HEI-OC1 cells revealed an increased number of autophagosomes accompanied by decreased lysosomal fusion. These data indicate that the downregulation of Uchl1 following GM treatment is deleterious to auditory cell survival, which results from the impaired autophagic flux. Our results provide evidence that UCHL1-dependent autophagic flux may have a potential as an otoprotective target for the treatment of GM-induced auditory cell death.
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Affiliation(s)
- Yeon Ju Kim
- Department of Otolaryngology, Ajou University School of Medicine, San 5 Woncheon-dong, Yeongtong-gu, Suwon, 443-721, Republic of Korea
| | - Kyung Kim
- Division of Hematology-Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
| | - Yun Yeong Lee
- Department of Otolaryngology, Ajou University School of Medicine, San 5 Woncheon-dong, Yeongtong-gu, Suwon, 443-721, Republic of Korea
| | - Oak-Sung Choo
- Department of Otolaryngology, Ajou University School of Medicine, San 5 Woncheon-dong, Yeongtong-gu, Suwon, 443-721, Republic of Korea.,Department of Medical Sciences, Ajou University Graduate School of Medicine, San 5 Woncheon-dong, Yeongtong-gu, Suwon, 443-721, Republic of Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, San 5 Woncheon-dong, Yeongtong-gu, Suwon, 443-721, Republic of Korea
| | - Yun-Hoon Choung
- Department of Otolaryngology, Ajou University School of Medicine, San 5 Woncheon-dong, Yeongtong-gu, Suwon, 443-721, Republic of Korea. .,Department of Medical Sciences, Ajou University Graduate School of Medicine, San 5 Woncheon-dong, Yeongtong-gu, Suwon, 443-721, Republic of Korea. .,BK21 Plus Research Center for Biomedical Sciences, Ajou University Graduate School of Medicine, San 5 Woncheon-dong, Yeongtong-gu, Suwon, 443-721, Republic of Korea.
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44
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Oh S, Jang JH, Kim HJ, Seo NS, Byun SH, Kim SW, Kim DS. Long-term Follow-up of Complicated Crown Fracture With Fragment Reattachment: Two Case Reports. Oper Dent 2019; 44:574-580. [PMID: 30702408 DOI: 10.2341/18-201-t] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Two cases of complicated crown fracture of the maxillary incisors were restored using the fragment reattachment technique. Root canal treatment was performed, and the fractured fragment was bonded to the tooth structure using a dentin adhesive system and a flowable composite resin, followed by the insertion of a fiber post using dual-cured resin cement. Reattached fragments have shown reliable prognosis without inflammatory signs around bonded junctions after long-term follow-up.
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45
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Seonwoo H, Shin B, Jang K, Lee M, Choo O, Park S, Kim YC, Choi M, Kim J, Garg P, Jang JH, Choung Y, Chung JH. Epidermal Growth Factor-Releasing Radially Aligned Electrospun Nanofibrous Patches for the Regeneration of Chronic Tympanic Membrane Perforations. Adv Healthc Mater 2019; 8:e1801160. [PMID: 30548428 DOI: 10.1002/adhm.201801160] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 11/15/2018] [Indexed: 01/01/2023]
Abstract
Chronic tympanic membrane (TM) perforations can cause otorrhea. To date, various types of tissue engineering techniques have been applied for the regeneration of chronic TM perforations. However, the application of nanofibers with radially aligned nanostructures and the simultaneous release of growth factors have never been applied in the regeneration of chronic TM perforations. Here, epidermal growth factor (EGF)-releasing radially aligned nanofibrous patches (ERA-NFPs) are developed and applied for the regeneration of chronic perforated TMs. First, radial alignments and the presence of EGF in the ERA-NFPs are analyzed. EGF is confirmed to be released from the ERA-NFPs until 8 weeks. In an in vitro study, cell viability assay, immunocytochemistry, and wound-healing assay indicate rational enhancement of healing by the combination of radial alignments and EGF release. The effect of ERA-NFPs on TM cells is revealed by quantitative real-time polymerase chain reaction. An in vivo animal study shows that the ERA-NFPs effectively stimulates the healing of the chronic TM perforations. The TMs healed by ERA-NFPs show histological properties similar to those of normal TMs. These results indicate that ERA-NFPs may be an efficient platform for the regeneration of chronic TM perforations, laying the foundation for nonsurgical treatments of chronic otitis media.
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Affiliation(s)
- Hoon Seonwoo
- Department of Industrial Machinery EngineeringCollege of Life Sciences and Natural ResourcesSunchon National University 255, Jungang‐ro, Suncheon‐si Jeollanam‐do 57922 Republic of Korea
| | - Beomyong Shin
- Department of Biomedical SciencesBK21 Plus Research Center for Biomedical SciencesAjou University Graduate School of Medicine San 5 Woncheon‐dong Yeongtong‐gu Suwon 443‐721 Republic of Korea
| | - Kyoung‐Je Jang
- Department of Biosystems & Biomaterials Science and EngineeringSeoul National University Seoul 151‐742 Republic of Korea
| | - Myungchul Lee
- Department of Biosystems & Biomaterials Science and EngineeringSeoul National University Seoul 151‐742 Republic of Korea
| | - Oak‐Sung Choo
- Department of OtolaryngologyAjou University School of Medicine San 5 Woncheon‐dong Yeongtong‐gu Suwon 443‐721 Republic of Korea
| | - Sang‐Bae Park
- Department of Biosystems & Biomaterials Science and EngineeringSeoul National University Seoul 151‐742 Republic of Korea
| | - Yeong Cheol Kim
- Department of Biomedical SciencesBK21 Plus Research Center for Biomedical SciencesAjou University Graduate School of Medicine San 5 Woncheon‐dong Yeongtong‐gu Suwon 443‐721 Republic of Korea
| | - Mi‐Jin Choi
- Department of Biomedical SciencesBK21 Plus Research Center for Biomedical SciencesAjou University Graduate School of Medicine San 5 Woncheon‐dong Yeongtong‐gu Suwon 443‐721 Republic of Korea
| | - Jangho Kim
- Department of Rural and Biosystems EngineeringChonnam National University Gwangju 500‐757 Republic of Korea
| | - Pankaj Garg
- Research Institute of Agriculture and Life SciencesSeoul National University Seoul 151‐742 Republic of Korea
| | - Jeong Hun Jang
- Department of OtolaryngologyAjou University School of Medicine San 5 Woncheon‐dong Yeongtong‐gu Suwon 443‐721 Republic of Korea
| | - Yun‐Hoon Choung
- Department of Biomedical SciencesBK21 Plus Research Center for Biomedical SciencesAjou University Graduate School of Medicine San 5 Woncheon‐dong Yeongtong‐gu Suwon 443‐721 Republic of Korea
- Department of OtolaryngologyAjou University School of Medicine San 5 Woncheon‐dong Yeongtong‐gu Suwon 443‐721 Republic of Korea
- Department of Medical SciencesAjou University Graduate School of Medicine San 5 Woncheon‐dong Yeongtong‐gu Suwon 443‐721 Republic of Korea
| | - Jong Hoon Chung
- Department of Biosystems & Biomaterials Science and EngineeringSeoul National University Seoul 151‐742 Republic of Korea
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46
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Lee J, Wijesinghe RE, Jeon D, Kim P, Choung YH, Jang JH, Jeon M, Kim J. Clinical Utility of Intraoperative Tympanomastoidectomy Assessment Using a Surgical Microscope Integrated with an Optical Coherence Tomography. Sci Rep 2018; 8:17432. [PMID: 30479360 PMCID: PMC6258704 DOI: 10.1038/s41598-018-35563-5] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2018] [Accepted: 10/29/2018] [Indexed: 12/15/2022] Open
Abstract
Significant technical and optical advances are required for intraoperative optical coherence tomography (OCT) to be utilized during otological surgeries. Integrating OCT with surgical microscopy makes it possible to evaluate soft tissue in real-time and at a high resolution. Herein, we describe an augmented-reality, intraoperative OCT/microscope system with an extended working distance of 280 mm, providing more space for surgical manipulation than conventional techniques. We initially performed ex vivo experiments to evaluate system performance. In addition, we validated the system by performing preliminary clinical assessments of tympanomastoidectomy outcomes in six patients with chronic otitis media. The system evaluated residual inflammation in the region-of-interest of the mastoid bone. Most importantly, the system intraoperatively revealed the connection between the graft and the remnant tympanic membrane. The extended working distance allows otological surgeons to evaluate the status of both the mastoid bone and tympanic membrane during manipulation, affording full intraoperative imaging.
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Affiliation(s)
- Jaeyul Lee
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 41566, Republic of Korea
| | - Ruchire Eranga Wijesinghe
- Department of Biomedical Engineering, College of Engineering, Kyungil University, 50, Gamasil-gil, Hayang-eup, Gyeongsan-si, Gyeongsangbuk-do, 38428, Republic of Korea
| | - Deokmin Jeon
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 41566, Republic of Korea
| | - Pilun Kim
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 41566, Republic of Korea
| | - Yun-Hoon Choung
- Department of Otolaryngology, School of Medicine, Ajou University, 164 World cup-ro, Yeongtong-gu, Suwon, Gyeunggi-do, 16499, Republic of Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, School of Medicine, Ajou University, 164 World cup-ro, Yeongtong-gu, Suwon, Gyeunggi-do, 16499, Republic of Korea.
| | - Mansik Jeon
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 41566, Republic of Korea
| | - Jeehyun Kim
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, 80 Daehak-ro, Buk-gu, Daegu, 41566, Republic of Korea.
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Kim BJ, Jang JH, Han JH, Park HR, Oh DY, Lee S, Kim MY, Kim AR, Lee C, Kim NKD, Park WY, Choung YH, Choi BY. Mutational and phenotypic spectrum of OTOF-related auditory neuropathy in Koreans: eliciting reciprocal interaction between bench and clinics. J Transl Med 2018; 16:330. [PMID: 30482216 PMCID: PMC6260760 DOI: 10.1186/s12967-018-1708-z] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/27/2018] [Accepted: 11/22/2018] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND While auditory neuropathy spectrum disorder (ANSD) is a heterogeneous disorder and its management quite varies depending upon the etiology, even including self-resolution, OTOF is an important molecular etiology of prelingual ANSD and has emerged as an attractive target for implementation of precision medicine in terms of timing and prognosis prediction of auditory rehabilitation. However, to date, the literature is lacking in the genotype-phenotype relationship of this gene as well as efficient molecular testing strategy in the clinic in many populations and to make things more complicated in Koreans, the most prevalent variant p.Arg1939Gln among Korean ANSD children frequently evaded detection by next generation sequencing (NGS), resulting in delayed genetic diagnosis and late cochlear implantation (CI). The aims of this study are to document the mutational and phenotypic spectrum of OTOF-related ANSD (DFNB9) in the Korean population, further establishing genotype-phenotype correlation and proposing a set of the most commonly found OTOF variants to be screened first. METHODS Genetic diagnosis through the NGS-based sequencing was made on patients with ANSD in two tertiary hospitals. Genotype and phenotypes of eleven DFNB9 patients were reviewed. For data analysis, Mann-Whitney test and Fisher's exact test were applied. RESULTS This study disclosed four prevalent variants in Koreans: p.Arg1939Gln with an allele frequency of 40.9%, p.Glu841Lys (13.6%), p.Leu1011Pro and p.Arg1856Trp (9.1%). Three novel variants (c.4227 + 5G > C, p.Gly1845Glu, and p.Pro1931Thr) were identified. Interestingly, a significant association of p.Arg1939Gln with worse ASSR thresholds was observed despite consistently no ABR response. Ten of 11 DFNB9 patients received CI for auditory rehabilitation, showing favorable outcomes with more rapid improvement on early-CI group (age at CI ≤ 18 mo.) than late-CI group. CONCLUSIONS This study included the largest Korean DFNB9 cohort to date and proposed a set of the most frequent four OTOF variants, allowing the potential prioritization of exons during Sanger sequencing. Further, a significant association of p.Arg1939Gln homozygotes with poor residual hearing was observed. We may have to suspect p.Arg1939Gln homozygosity in cases of poor auditory thresholds in ANSD children with putative negative OTOF variants solely screened by NGS. Reciprocal feedback between bench and clinics regarding DFNB9 would complement each other.
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Affiliation(s)
- Bong Jik Kim
- Department of Otolaryngology-Head and Neck Surgery, Chungnam National University College of Medicine, Daejeon, 35015, Korea.,Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 13620, Republic of South Korea
| | - Jeong Hun Jang
- Department of Otorhinolaryngology-Head and Neck Surgery, Ajou University School of Medicine, Suwon, 16499, Korea
| | - Jin Hee Han
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 13620, Republic of South Korea
| | - Hye-Rim Park
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 13620, Republic of South Korea
| | - Doo Yi Oh
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 13620, Republic of South Korea
| | - Seungmin Lee
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 13620, Republic of South Korea
| | - Min Young Kim
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 13620, Republic of South Korea
| | - Ah Reum Kim
- Samsung Genome Institute, Samsung Medical Center, Seoul, 06351, Korea
| | - Chung Lee
- Samsung Genome Institute, Samsung Medical Center, Seoul, 06351, Korea
| | - Nayoung K D Kim
- Samsung Genome Institute, Samsung Medical Center, Seoul, 06351, Korea
| | - Woong-Yang Park
- Samsung Genome Institute, Samsung Medical Center, Seoul, 06351, Korea.,Department of Molecular Cell Biology, School of Medicine, Sungkyunkwan University, Seoul, 06351, Korea
| | - Yun-Hoon Choung
- Department of Otorhinolaryngology-Head and Neck Surgery, Ajou University School of Medicine, Suwon, 16499, Korea.
| | - Byung Yoon Choi
- Department of Otorhinolaryngology-Head and Neck Surgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, 300 Gumi-dong, Bundang-gu, Seongnam, 13620, Republic of South Korea. .,Sensory Organ Research Institute, Seoul National University Medical Research Center, Seoul, 03080, Korea.
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Jang JH, Wu YN, Kim SJ, Zhang YH. P927Neuronal nitric oxide synthase-beta in the myofilament and maintains sarcomere structure in cardiomyocyte. Eur Heart J 2018. [DOI: 10.1093/eurheartj/ehy564.p927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- J H Jang
- Seoul National University, Seoul, Korea Republic of
| | - Y N Wu
- Seoul National University, Seoul, Korea Republic of
| | - S J Kim
- Seoul National University, Seoul, Korea Republic of
| | - Y H Zhang
- Seoul National University, Seoul, Korea Republic of
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Jeon D, Cho NH, Park K, Kim K, Jeon M, Jang JH, Kim J. In Vivo Vibration Measurement of Middle Ear Structure Using Doppler Optical Coherence Tomography: Preliminary Study. Clin Exp Otorhinolaryngol 2018; 12:40-49. [PMID: 30045616 PMCID: PMC6315208 DOI: 10.21053/ceo.2018.00185] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2018] [Accepted: 05/31/2018] [Indexed: 12/27/2022] Open
Abstract
Objectives Doppler optical coherence tomography (DOCT) is useful for both, the spatially resolved measurement of the tympanic membrane (TM) oscillation and high-resolution imaging. We demonstrated a new technique capable of providing real-time two-dimensional Doppler OCT image of rapidly oscillatory latex mini-drum and in vivo rat TM and ossicles. Methods Using DOCT system, the oscillation of sample was measured at frequency range of 1–4 kHz at an output of 15 W. After the sensitivity of the DOCT system was verified using a latex mini-drum consisting of a 100 μm-thick latex membrane, changes in displacement of the umbo and contacted area between TM and malleus in normal and pathologic conditions. Results The oscillation cycles of the mini-drum for stimulus frequencies were 1.006 kHz for 1 kHz, 2.012 kHz for 2kHz, and 3.912 kHz for 4 kHz, which means that the oscillation cycle of the mini-drum become short in proportional to the frequency of stimuli. The oscillation cycles of umbo area and the junction area in normal TM for frequencies of the stimuli showed similar integer ratio with the data of latex mini-drum for stimuli less than 4 kHz. In the case of middle ear effusion condition, the Doppler signal showed a tendency of attenuation in all frequencies, which was prominent at 1 kHz and 2 kHz. Conclusion The TM vibration under sound stimulation with frequencies from 1 kHz to 4 kHz in normal and pathologic conditions was demonstrated using signal demodulation method in in vivo condition. The OCT technology could be helpful for functional and structural assessment as an optional modality.
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Affiliation(s)
- Doekmin Jeon
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu, Korea
| | - Nam Hyun Cho
- Department of Otology and Laryngology, Harvard Medical School, Boston, MA, USA.,Eaton-Peabody Laboratories, Massachusetts Eye and Ear Infirmary (MEEI), Boston, MA, USA
| | - Kibeom Park
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu, Korea
| | - Kanghae Kim
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu, Korea
| | - Mansik Jeon
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu, Korea
| | - Jeong Hun Jang
- Department of Otolaryngology, Ajou University School of Medicine, Suwon, Korea
| | - Jeehyun Kim
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu, Korea
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50
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Park K, Cho NH, Jeon M, Lee SH, Jang JH, Boppart SA, Jung W, Kim J. Optical assessment of the in vivo tympanic membrane status using a handheld optical coherence tomography-based otoscope. Acta Otolaryngol 2018; 138:367-374. [PMID: 29125012 DOI: 10.1080/00016489.2017.1395515] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
OBJECTIVE Conventional otoscopes and oto-endoscopes, which are used to examine the tympanic membrane (TM), do not provide tomographic information. Optical coherence tomography (OCT) non-invasively reveals the depth-resolved internal microstructure of the TM with very high spatial resolution. We designed this study to examine the TMs with middle ear diseases using a handheld otoscope employing 860 nm spectral domain (SD)-OCT, combined with video camera and to demonstrate the clinical applicability of this system. DESIGN A total of 120 patients with otologic symptoms were enrolled. TM images were obtained using the handheld OCT-based otoscope (860 nm central wave length, 15 μm axial resolution, 15 μm lateral resolution, and 7 mm scanning range using relay lens). Both OCT and oto-endoscope images were compared according to the clinical characteristics such as perforation, retraction, and postoperative healing process. RESULTS The objective grade about the thickness of perforation margins and the accurate information about the extent of TM retraction that was not distinguishable by oto-endoscopic exam could be identified using this system. The postoperative healing process of TMs could be also followed using the OCT device. CONCLUSION These analyses from the surgeon-oriented perspective suggest another useful application of the handheld OCT device.
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Affiliation(s)
- Kibeom Park
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu, Korea
| | - Nam Hyun Cho
- Eaton-Peabody Laboratories, Massachusetts Eye and Ear Infirmary (MEEI), Boston, MA, USA
- Department of Otology and Laryngology, Harvard Medical School, Boston, MA, USA
| | - Mansik Jeon
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu, Korea
| | - Sang Heun Lee
- Department of Otorhinolaryngology, Daegu Veterans Hospital, Daegu, Korea
| | - Jeong Hun Jang
- Department of Otorhinolaryngology, College of Medicine, Ajou University, Suwon, Korea
| | - Stephen A. Boppart
- Department of Electrical and Computer Engineering, University of Illinois at Urbana-Champaign, Urbana, IL, USA
- Beckman Institute for Advanced Science, Urbana, IL, USA
| | - Woonggyu Jung
- School of Nano-Bioscience and Chemical Engineering, School of Electrical and Computer Engineering, Ulsan National Institute of Science and Technology, Ulsan, Korea
| | - Jeehyun Kim
- School of Electronics Engineering, College of IT Engineering, Kyungpook National University, Daegu, Korea
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