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Batsaikhan T, Choi JS, Ha SM, Ahn Y, Seo YJ. D-Galactose and Hypoxia Induce the Early Onset of Age-Related Hearing Loss Deterioration in a Mouse Model. Tissue Eng Regen Med 2023; 20:779-787. [PMID: 37294515 PMCID: PMC10352183 DOI: 10.1007/s13770-023-00547-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2023] [Revised: 04/18/2023] [Accepted: 04/20/2023] [Indexed: 06/10/2023] Open
Abstract
BACKGROUND We previously showed that aging accelerates after 3 months of exposure to hypoxia and environmental change but not genetic modifications. Here, we aimed to simply induce early-onset age-related hearing loss within a short period based on our previous method. METHODS We randomly divided 16 C57BL/6 mice into four groups that were maintained under conditions of normoxia and hypoxia with or without injected D-galactose for 2 months. Deteriorated hearing, the expression of age-related factors, and oxidative stress responses were detected using the click and tone burst auditory brainstem response test, reverse transcription-polymerase chain reaction, and by measuring superoxide dismutase (SOD). RESULTS The group maintained under hypoxia combined with D-galactose lost hearing particularly at 24 Hz and 32 Hz at 6 weeks compared with the other groups. Aging-related factors were also significantly decreased in the hypoxia and D-galactose groups. However, SOD levels did not significantly differ among the groups. CONCLUSION Age-related hearing loss is an environmental disorder induced by chronic oxidative stress associated with genetic backgrounds. Our findings suggested that D-galactose and hypoxia can induce the phenotypes of age-related hearing loss and aging-associated molecules in a murine model within a short time with environmental stimulation alone.
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Affiliation(s)
- Temuulen Batsaikhan
- Department of Otorhinolaryngology, Yonsei University Wonju College of Medicine, 20 Ilsan-ro, Wonju, Gangwon-do, 26426, South Korea
- Research Institute of Hearing Enhancement, Yonsei University Wonju College of Medicine, 20 Ilsan-ro, Wonju, 26426, South Korea
| | - Jin Sil Choi
- Department of Otorhinolaryngology, Yonsei University Wonju College of Medicine, 20 Ilsan-ro, Wonju, Gangwon-do, 26426, South Korea
- Research Institute of Hearing Enhancement, Yonsei University Wonju College of Medicine, 20 Ilsan-ro, Wonju, 26426, South Korea
| | - Sun Mok Ha
- Department of Otorhinolaryngology, Yonsei University Wonju College of Medicine, 20 Ilsan-ro, Wonju, Gangwon-do, 26426, South Korea
- Research Institute of Hearing Enhancement, Yonsei University Wonju College of Medicine, 20 Ilsan-ro, Wonju, 26426, South Korea
| | - Yeji Ahn
- Department of Otorhinolaryngology, Yonsei University Wonju College of Medicine, 20 Ilsan-ro, Wonju, Gangwon-do, 26426, South Korea
- Research Institute of Hearing Enhancement, Yonsei University Wonju College of Medicine, 20 Ilsan-ro, Wonju, 26426, South Korea
| | - Young Joon Seo
- Department of Otorhinolaryngology, Yonsei University Wonju College of Medicine, 20 Ilsan-ro, Wonju, Gangwon-do, 26426, South Korea.
- Research Institute of Hearing Enhancement, Yonsei University Wonju College of Medicine, 20 Ilsan-ro, Wonju, 26426, South Korea.
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Kim SJ, Gajbhiye A, Lyu AR, Kim TH, Shin SA, Kwon HC, Park YH, Park MJ. Sex differences in hearing impairment due to diet-induced obesity in CBA/Ca mice. Biol Sex Differ 2023; 14:10. [PMID: 36810096 PMCID: PMC9945383 DOI: 10.1186/s13293-023-00493-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/05/2022] [Accepted: 02/07/2023] [Indexed: 02/24/2023] Open
Abstract
BACKGROUND Obesity is an independent risk factor for hearing loss. Although attention has focused on major obesity comorbidities such as cardiovascular disease, stroke, and type 2 diabetes, the impact of obesity on sensorineural organs, including the auditory system, is unclear. Using a high-fat diet (HFD)-induced obese mouse model, we investigated the impact of diet-induced obesity on sexual dimorphism in metabolic alterations and hearing sensitivity. METHODS Male and female CBA/Ca mice were randomly assigned to three diet groups and fed, from weaning (at 28 days) to 14 weeks of age, a sucrose-matched control diet (10 kcal% fat content diet), or one of two HFDs (45 or 60 kcal% fat content diets). Auditory sensitivity was evaluated based on the auditory brainstem response (ABR), distortion product otoacoustic emission (DPOAE), and ABR wave 1 amplitude at 14 weeks of age, followed by biochemical analyses. RESULTS We found significant sexual dimorphism in HFD-induced metabolic alterations and obesity-related hearing loss. Male mice exhibited greater weight gain, hyperglycemia, increased ABR thresholds at low frequencies, elevated DPOAE, and lower ABR wave 1 amplitude compared to female mice. The hair cell (HC) ribbon synapse (CtBP2) puncta showed significant sex differences. The serum concentration of adiponectin, an otoprotective adipokine, was significantly higher in female than in male mice; cochlear adiponectin levels were elevated by HFD in female but not male mice. Adiponectin receptor 1 (AdipoR1) was widely expressed in the inner ear, and cochlear AdipoR1 protein levels were increased by HFD, in female but not male mice. Stress granules (G3BP1) were significantly induced by the HFD in both sexes; conversely, inflammatory (IL-1β) responses were observed only in the male liver and cochlea, consistent with phenotype HFD-induced obesity. CONCLUSIONS Female mice are more resistant to the negative effects of an HFD on body weight, metabolism, and hearing. Females showed increased peripheral and intra-cochlear adiponectin and AdipoR1 levels, and HC ribbon synapses. These changes may mediate resistance to HFD-induced hearing loss seen in female mice.
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Affiliation(s)
- Soo Jeong Kim
- grid.254230.20000 0001 0722 6377Brain Research Institute, College of Medicine, Chungnam National University, 282 Munwha-ro, Daesa-dong, Jung-gu, 35015 Daejeon, South Korea
| | - Akanksha Gajbhiye
- grid.254230.20000 0001 0722 6377Department of Medical Science, College of Medicine, Chungnam National University, Daejeon, 35015 South Korea
| | - Ah-Ra Lyu
- grid.254230.20000 0001 0722 6377Brain Research Institute, College of Medicine, Chungnam National University, 282 Munwha-ro, Daesa-dong, Jung-gu, 35015 Daejeon, South Korea
| | - Tae Hwan Kim
- grid.254230.20000 0001 0722 6377Department of Medical Science, College of Medicine, Chungnam National University, Daejeon, 35015 South Korea
| | - Sun-Ae Shin
- grid.254230.20000 0001 0722 6377Brain Research Institute, College of Medicine, Chungnam National University, 282 Munwha-ro, Daesa-dong, Jung-gu, 35015 Daejeon, South Korea
| | - Hyuk Chan Kwon
- grid.254230.20000 0001 0722 6377Department of Medical Science, College of Medicine, Chungnam National University, Daejeon, 35015 South Korea
| | - Yong-Ho Park
- Brain Research Institute, College of Medicine, Chungnam National University, 282 Munwha-ro, Daesa-dong, Jung-gu, 35015, Daejeon, South Korea. .,Department of Medical Science, College of Medicine, Chungnam National University, Daejeon, 35015, South Korea. .,Department of Otolaryngology-Head and Neck Surgery, College of Medicine, Chungnam National University, Daejeon, 35015, South Korea.
| | - Min Jung Park
- Brain Research Institute, College of Medicine, Chungnam National University, 282 Munwha-ro, Daesa-dong, Jung-gu, 35015, Daejeon, South Korea. .,Department of Otolaryngology-Head and Neck Surgery, College of Medicine, Chungnam National University, Daejeon, 35015, South Korea.
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Nguyen PTT, Song H, Kim B, Kim YY, Kim C, Lee JH, Suh JG. Age-related hearing loss was accelerated by apoptosis of spiral ganglion and stria vascularis cells in ApoE KO mice with hyperglycemia and hyperlipidemia. Front Neurol 2022; 13:1016654. [PMID: 36408520 PMCID: PMC9669308 DOI: 10.3389/fneur.2022.1016654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2022] [Accepted: 10/10/2022] [Indexed: 11/06/2022] Open
Abstract
Age-related hearing loss (ARHL) is associated with diabetes and/or dyslipidemia in humans. However, the detailed mechanism for the development of ARHL by diabetes and/or dyslipidemia has not been elucidated. In this study, we investigated the etiology of ARHL in apolipoprotein E (ApoE)-deficient mice with diabetes and dyslipidemia. The atherosclerotic CD-STZ (mice fed with a control diet and received an STZ injection), WD-con (mice fed with a western diet), and WD-STZ (mice fed with a western diet and received an STZ injection) mice showed a 2.4-, 4.9-, and 6.8-fold larger area, respectively, occupied by lesions throughout the aorta compared with the CD-con mice. A significantly larger area under the curve (AUC) was observed in the STZ-treated groups than in the non-treated groups based on the oral glucose tolerance test (OGTT). At 20 weeks of age, HbA1c levels were significantly higher in the CD-STZ and WD-STZ mice than in the CD-con and WD-con mice. In all the groups, the auditory brainstem response (ABR) thresholds of the 16-week-old mice were significantly higher compared with those of the 8-week-old mice. In particular, in the WD-STZ mice, the ABR thresholds of the left and right ears reached the maximum decibel peak equivalent sound pressure levels (130 dBpeSPL), which is a sign of deafness. The apoptotic spiral ganglion neurons (SGNs) of the WD-STZ mice were significantly increased compared with those of the other three groups, indicating that SGN apoptosis resulted in hearing loss in STZ-induced diabetic ApoE KO mice fed with a WD. A significant loss of the stria vascularis cells was observed in the WD-STZ group compared with the CD-con mice. In the organ of Corti, few apoptotic hair cells were found in all the groups; however, no significant difference was observed. Therefore, we consider that the reduced hearing ability in the STZ-treated and WD-fed groups was attributed to the damage to the SGN and stria vascularis in the cochlea. Thus, our results indicated that ototoxicity by diabetes and/or dyslipidemia accelerated ARHL in ApoE KO mice, thereby suggesting the importance of appropriate treatment of patients with diabetes and/or dyslipidemia to prevent ARHL.
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Affiliation(s)
- Phuong Thi Thanh Nguyen
- Department of Medical Genetics, College of Medicine, Hallym University, Chuncheon, South Korea
| | - Hayoung Song
- Institute of New Frontier Research, Hallym University College of Medicine, Chuncheon, South Korea
| | - Boyoung Kim
- Department of Medical Genetics, College of Medicine, Hallym University, Chuncheon, South Korea
| | - Yoo Yeon Kim
- Department of Medical Genetics, College of Medicine, Hallym University, Chuncheon, South Korea
| | - Chulho Kim
- Department of Neurology, Chuncheon Sacred Heart Hospital, Hallym University, Chuncheon, South Korea
| | - Jun Ho Lee
- Institute of New Frontier Research, Hallym University College of Medicine, Chuncheon, South Korea
- Department of Otorhinolaryngology-Head and Neck Surgery, College of Medicine, Hallym University, Chuncheon, South Korea
- *Correspondence: Jun Ho Lee
| | - Jun Gyo Suh
- Department of Medical Genetics, College of Medicine, Hallym University, Chuncheon, South Korea
- Institute of Medical Science, College of Medicine, Hallym University, Chuncheon, South Korea
- Jun Gyo Suh
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Guo D, Zhang A, Zou T, Ding R, Chen K, Pan Y, Ji P, Ye B, Xiang M. The influence of metabolic syndrome on age-related hearing loss from the perspective of mitochondrial dysfunction. Front Aging Neurosci 2022; 14:930105. [PMID: 35966796 PMCID: PMC9372463 DOI: 10.3389/fnagi.2022.930105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2022] [Accepted: 07/12/2022] [Indexed: 12/06/2022] Open
Abstract
With the increase in life expectancy in the global population, aging societies have emerged in many countries, including China. As a common sensory defect in the elderly population, the prevalence of age-related hearing loss and its influence on society are increasing yearly. Metabolic syndrome is currently one of the main health problems in the world. Many studies have demonstrated that metabolic syndrome and its components are correlated with a variety of age-related diseases of the peripheral sensory system, including age-related hearing loss. Both age-related hearing loss and metabolic syndrome are high-prevalence chronic diseases, and many people suffer from both at the same time. In recent years, more and more studies have found that mitochondrial dysfunction occurs in both metabolic syndrome and age-related hearing loss. Therefore, to better understand the impact of metabolic syndrome on age-related hearing loss from the perspective of mitochondrial dysfunction, we reviewed the literature related to the relationship between age-related hearing loss and metabolic syndrome and their components to discern the possible role of mitochondria in both conditions.
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Affiliation(s)
- Dongye Guo
- Department of Otolaryngology & Head and Neck Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Andi Zhang
- Department of Otolaryngology & Head and Neck Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Tianyuan Zou
- Department of Otolaryngology & Head and Neck Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Rui Ding
- Department of Otolaryngology & Head and Neck Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Kaili Chen
- Department of Otolaryngology & Head and Neck Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Yi Pan
- Department of Otolaryngology & Head and Neck Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Peilin Ji
- Department of Otolaryngology & Head and Neck Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
| | - Bin Ye
- Department of Otolaryngology & Head and Neck Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
- *Correspondence: Bin Ye,
| | - Mingliang Xiang
- Department of Otolaryngology & Head and Neck Surgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Ear Institute, Shanghai Jiao Tong University School of Medicine, Shanghai, China
- Shanghai Key Laboratory of Translational Medicine on Ear and Nose Diseases, Shanghai, China
- Mingliang Xiang,
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Theodoroff SM, Gallun FJ, McMillan GP, Molis M, Srinivasan N, Gordon J, McDermott D, Konrad-Martin D. Impacts of Diabetes, Aging, and Hearing Loss on Speech-on-Speech Masking and Spatial Release in a Large Veteran Cohort. Am J Audiol 2021; 30:1023-1036. [PMID: 34633838 DOI: 10.1044/2021_aja-21-00022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
PURPOSE Type 2 diabetes mellitus (DM2) is associated with impaired hearing. However, the evidence is less clear if DM2 can lead to difficulty understanding speech in complex acoustic environments, independently of age and hearing loss effects. The purpose of this study was to estimate the magnitude of DM2-related effects on speech understanding in the presence of competing speech after adjusting for age and hearing. METHOD A cross-sectional study design was used to investigate the relationship between DM2 and speech understanding in 190 Veterans (M age = 47 years, range: 25-76). Participants were classified as having no diabetes (n = 74), prediabetes (n = 19), or DM2 that was well controlled (n = 24) or poorly controlled (n = 73). A test of spatial release from masking (SRM) was presented in a virtual acoustical simulation over insert earphones with multiple talkers using sentences from the coordinate response measure corpus to determine the target-to-masker ratio (TMR) required for 50% correct identification of target speech. A linear mixed model of the TMR results was used to estimate SRM and separate effects of diabetes group, age, and low-frequency pure-tone average (PTA-low) and high-frequency pure-tone average. A separate model estimated the effects of DM2 on PTA-low. RESULTS After adjusting for hearing and age, diabetes-related effects remained among those whose DM2 was well controlled, showing an SRM loss of approximately 0.5 dB. Results also showed effects of hearing loss and age, consistent with the literature on people without DM2. Low-frequency hearing loss was greater among those with DM2. CONCLUSIONS In a large cohort of Veterans, low-frequency hearing loss and older age negatively impact speech understanding. Compared with nondiabetics, individuals with controlled DM2 have additional auditory deficits beyond those associated with hearing loss or aging. These results provide a potential explanation for why individuals who have diabetes and/or are older often report difficulty understanding speech in real-world listening environments. SUPPLEMENTAL MATERIAL https://doi.org/10.23641/asha.16746475.
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Affiliation(s)
- Sarah M. Theodoroff
- VA Rehabilitation Research and Development Service, National Center for Rehabilitative Auditory Research, VA Portland Health Care System, United States Department of Veterans Affairs, OR
- Department of Otolaryngology—Head & Neck Surgery, Oregon Health & Science University, Portland
| | - Frederick J. Gallun
- VA Rehabilitation Research and Development Service, National Center for Rehabilitative Auditory Research, VA Portland Health Care System, United States Department of Veterans Affairs, OR
- Department of Otolaryngology—Head & Neck Surgery, Oregon Health & Science University, Portland
| | - Garnett P. McMillan
- VA Rehabilitation Research and Development Service, National Center for Rehabilitative Auditory Research, VA Portland Health Care System, United States Department of Veterans Affairs, OR
| | - Michelle Molis
- VA Rehabilitation Research and Development Service, National Center for Rehabilitative Auditory Research, VA Portland Health Care System, United States Department of Veterans Affairs, OR
- Department of Otolaryngology—Head & Neck Surgery, Oregon Health & Science University, Portland
| | - Nirmal Srinivasan
- Department of Speech-Language Pathology & Audiology, Towson University, MD
| | - Jane Gordon
- VA Rehabilitation Research and Development Service, National Center for Rehabilitative Auditory Research, VA Portland Health Care System, United States Department of Veterans Affairs, OR
| | - Daniel McDermott
- VA Rehabilitation Research and Development Service, National Center for Rehabilitative Auditory Research, VA Portland Health Care System, United States Department of Veterans Affairs, OR
| | - Dawn Konrad-Martin
- VA Rehabilitation Research and Development Service, National Center for Rehabilitative Auditory Research, VA Portland Health Care System, United States Department of Veterans Affairs, OR
- Department of Otolaryngology—Head & Neck Surgery, Oregon Health & Science University, Portland
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Miwa T. Protective Effects of N 1-Methylnicotinamide Against High-Fat Diet- and Age-Induced Hearing Loss via Moderate Overexpression of Sirtuin 1 Protein. Front Cell Neurosci 2021; 15:634868. [PMID: 33889076 PMCID: PMC8055820 DOI: 10.3389/fncel.2021.634868] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/29/2020] [Accepted: 03/15/2021] [Indexed: 11/13/2022] Open
Abstract
Age-related hearing loss (ARHL) is the most common form of hearing loss and the predominant neurodegenerative disease associated with aging. Sirtuin 1 (SIRT1) is associated with the most complex physiological processes, including metabolism, cancer onset, and aging. SIRT1 protein levels are enhanced by the conversion of nicotinamide to N1-methylnicotinamide (MNAM), independent of its mRNA levels. Moreover, MNAM has implications in increased longevity achieved through its mitohormetic effects. Nicotinamide N-methyltransferase (Nnmt) is an enzyme involved in MNAM metabolism, and its level increases under caloric restriction (CR) conditions. The CR condition has implications in delaying ARHL onset. In this study, we aimed to determine the relationship between diet, hearing function, SIRT1 and SIRT3 expression levels in the inner ear, and cochlear morphology. Mice fed with a high-fat diet (HFD), HFD + 1% MNAM, and low-fat diet (LFD) were monitored for age-related auditory-evoked brainstem responses, and changes in cochlear histology, metabolism, and protein and mRNA expressions were analyzed. Our results revealed that the HFD- and aging-mediated downregulated expression of SIRT1 and SIRT3 promoted hearing loss that was obfuscated by MNAM supplementation-induced upregulated expression of cochlear SIRT1 and SIRT3. Thus, our results suggest that MNAM can be used as a therapeutic agent for preventing ARHL.
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Affiliation(s)
- Toru Miwa
- Department of Otolaryngology and Head and Neck Surgery, Kitano Hospital, Tazuke Kofukai Medical Research Institute, Osaka, Japan.,Department of Otolaryngology and Head and Neck Surgery, Graduate of School of Medicine, Kyoto University, Kyoto, Japan
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7
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Bae SH, Kwak SH, Choi JY, Jung J. Synergistic effect of smoking on age-related hearing loss in patients with diabetes. Sci Rep 2020; 10:18893. [PMID: 33144636 PMCID: PMC7641162 DOI: 10.1038/s41598-020-75880-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2020] [Accepted: 10/16/2020] [Indexed: 02/06/2023] Open
Abstract
This study investigated the synergistic effects of risk factors on age-related hearing loss (ARHL) using nationwide cross-sectional data of 33,552 individuals from the 2010‒2013 Korea National Health and Nutrition Examination Survey. Patients with ARHL were selected based on their pure-tone audiometry results. Previously reported risk factors for ARHL were analyzed using logistic regression and propensity score-matching, and synergistic effects between risk factors were analyzed using propensity score-matching. Of the 12,570 individuals aged 40–79 years, 2002 (15.9%) met the criteria for ARHL. Male sex, exposure to occupational noise, and diabetes showed a significant relationship with ARHL (p < 0.05) in both the logistic regression and propensity score-matching analyses. Smoking and diabetes showed the strongest significant synergistic effect on ARHL (odds ratio [OR] 1.963, 95% confidence interval [CI] 1.285‒2.998; p = 0.002). In the subgroup analysis based on smoking status, current smokers with diabetes had a significant relationship with ARHL (OR 1.883, CI 1.191‒2.975; p = 0.009), whereas ex-smokers with diabetes did not (OR 1.250; CI 0.880‒1.775; p = 0.246). This implies that current smokers with diabetes may benefit from the cessation of smoking. In conclusion, patients with diabetes should strictly avoid or cease smoking to prevent the progression of ARHL.
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Affiliation(s)
- Seong Hoon Bae
- Department of Otorhinolaryngology, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Sang Hyun Kwak
- Department of Otorhinolaryngology, St. Vincent Hospital, College of Medicine, The Catholic University of Korea, Suwon, Republic of Korea
| | - Jae Young Choi
- Department of Otorhinolaryngology, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea
| | - Jinsei Jung
- Department of Otorhinolaryngology, Yonsei University College of Medicine, 50-1 Yonsei-ro, Seodaemun-gu, Seoul, 03722, Republic of Korea. .,Graduate School of Medical Science, Brain Korea 21 Project, Yonsei University College of Medicine, Seoul, Republic of Korea.
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8
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Frisina RD, Bazard P, Bauer M, Pineros J, Zhu X, Ding B. Translational implications of the interactions between hormones and age-related hearing loss. Hear Res 2020; 402:108093. [PMID: 33097316 DOI: 10.1016/j.heares.2020.108093] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/08/2020] [Revised: 09/05/2020] [Accepted: 10/12/2020] [Indexed: 11/30/2022]
Abstract
Provocative research has revealed both positive and negative effects of hormones on hearing as we age; with in some cases, mis-regulation of hormonal levels in instances of medical comorbidities linked to aging, lying at the heart of the problem. Animal model studies have discovered that hormonal fluctuations can sharpen hearing for improved communication and processing of mating calls during reproductive seasons. Sex hormones sometimes have positive effects on auditory processing, as is often the case with estrogen, whereas combinations of estrogen and progesterone, and testosterone, can have negative effects on hearing abilities, particularly in aging subjects. Too much or too little of some hormones can be detrimental, as is the case for aldosterone and thyroid hormones, which generally decline in older individuals. Too little insulin, as in Type 1 diabetics, or poor regulation of insulin, as in Type 2 diabetics, is also harmful to hearing in our aged population. In terms of clinical translational possibilities, hormone therapies can be problematic due to systemic side effects, as has happened for estrogen/progestin combination hormone replacement therapy (HRT) in older women, where the HRT induces a hearing loss. As hormone therapy approaches are further developed, it may be possible to lower needed doses of hormones by combining them with supplements, such as antioxidants. Another option will be to take advantage of emerging technologies for local drug delivery to the inner ear, including biodegradeable, sustained-release hydrogels and micro-pumps which can be implanted in the middle ear near the round window. In closing, exciting research completed to date, summarized in the present report bodes well for emerging biomedical therapies to prevent or treat age-related hearing loss utilizing hormonal strategies.
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Affiliation(s)
- R D Frisina
- Dept. Medical Engineering, Global Center for Hearing & Speech Research, University of South Florida, Tampa FL, USA; Dept. Communication Sciences & Disorders, Global Center for Hearing & Speech Research, University of South Florida, Tampa FL, USA.
| | - P Bazard
- Dept. Medical Engineering, Global Center for Hearing & Speech Research, University of South Florida, Tampa FL, USA
| | - M Bauer
- Dept. Medical Engineering, Global Center for Hearing & Speech Research, University of South Florida, Tampa FL, USA
| | - J Pineros
- Dept. Medical Engineering, Global Center for Hearing & Speech Research, University of South Florida, Tampa FL, USA
| | - X Zhu
- Dept. Medical Engineering, Global Center for Hearing & Speech Research, University of South Florida, Tampa FL, USA
| | - B Ding
- Dept. Medical Engineering, Global Center for Hearing & Speech Research, University of South Florida, Tampa FL, USA
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9
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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] [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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10
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Pålbrink AK, Kopietz F, Morén B, In 't Zandt R, Kalinec F, Stenkula K, Göransson O, Holm C, Magnusson M, Degerman E. Inner ear is a target for insulin signaling and insulin resistance: evidence from mice and auditory HEI-OC1 cells. BMJ Open Diabetes Res Care 2020; 8:8/1/e000820. [PMID: 32238362 PMCID: PMC7170413 DOI: 10.1136/bmjdrc-2019-000820] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/13/2019] [Revised: 02/14/2020] [Accepted: 03/03/2020] [Indexed: 12/20/2022] Open
Abstract
OBJECTIVE The mechanisms underlying the association between diabetes and inner ear dysfunction are not known yet. The aim of the present study is to evaluate the impact of obesity/insulin resistance on inner ear fluid homeostasis in vivo, and to investigate whether the organ of Corti could be a target tissue for insulin signaling using auditory House Ear Institute-Organ of Corti 1 (HEI-OC1) cells as an in vitro model. METHODS High fat diet (HFD) fed C57BL/6J mice were used as a model to study the impact of insulin resistance on the inner ear. In one study, 12 C57BL/6J mice were fed either control diet or HFD and the size of the inner ear endolymphatic fluid compartment (EFC) was measured after 30 days using MRI and gadolinium contrast as a read-out. In another study, the size of the inner ear EFC was evaluated in eight C57BL/6J mice both before and after HFD feeding, with the same techniques. HEI-OC1 auditory cells were used as a model to investigate insulin signaling in organ of Corti cells. RESULTS HFD feeding induced an expansion of the EFC in C57BL/6J mice, a hallmark of inner ear dysfunction. Insulin also induced phosphorylation of protein kinase B (PKB/Akt) at Ser473, in a PI3-kinase-dependent manner. The phosphorylation of PKB was inhibited by isoproterenol and IBMX, a general phosphodiesterase (PDE) inhibitor. PDE1B, PDE4D and the insulin-sensitive PDE3B were found expressed and catalytically active in HEI-OC1 cells. Insulin decreased and AICAR, an activator of AMP-activated protein kinase, increased the phosphorylation at the inhibitory Ser79 of acetyl-CoA carboxylase, the rate-limiting enzyme in de novo lipogenesis. Furthermore, the activity of hormone-sensitive lipase, the rate-limiting enzyme in lipolysis, was detected in HEI-OC1 cells. CONCLUSIONS The organ of Corti could be a target tissue for insulin action, and inner ear insulin resistance might contribute to the association between diabetes and inner ear dysfunction.
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Affiliation(s)
- Ann-Ki Pålbrink
- Experimental Medical Science, Section for Diabetes, Metabolism and Endocrinology, Lund University Diabetes Centre, Lund University, Lund, Sweden
| | - Franziska Kopietz
- Experimental Medical Science, Section for Diabetes, Metabolism and Endocrinology, Lund University Diabetes Centre, Lund University, Lund, Sweden
| | - Björn Morén
- Experimental Medical Science, Section for Diabetes, Metabolism and Endocrinology, Lund University Diabetes Centre, Lund University, Lund, Sweden
| | - René In 't Zandt
- Lund University Bioimaging Center, Lund University, Lund, Sweden
| | - Federico Kalinec
- Department of Head and Neck Surgery, Laboratory of Auditory Cell Biology, David Geffen Schoolof Medicin, UCLA, Los Angeles, California, USA
| | - Karin Stenkula
- Experimental Medical Science, Section for Diabetes, Metabolism and Endocrinology, Lund University Diabetes Centre, Lund University, Lund, Sweden
| | - Olga Göransson
- Experimental Medical Science, Section for Diabetes, Metabolism and Endocrinology, Lund University Diabetes Centre, Lund University, Lund, Sweden
| | - Cecilia Holm
- Experimental Medical Science, Section for Diabetes, Metabolism and Endocrinology, Lund University Diabetes Centre, Lund University, Lund, Sweden
| | - Måns Magnusson
- Department of Clinical Science, Section for Otorhinolaryngology, Lund University & Skåne University Hospital, Lund, Sweden
| | - Eva Degerman
- Experimental Medical Science, Section for Diabetes, Metabolism and Endocrinology, Lund University Diabetes Centre, Lund University, Lund, Sweden
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11
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Sardone R, Lampignano L, Guerra V, Zupo R, Donghia R, Castellana F, Battista P, Bortone I, Procino F, Castellana M, Passantino A, Rucco R, Lozupone M, Seripa D, Panza F, De Pergola G, Giannelli G, Logroscino G, Boeing H, Quaranta N. Relationship between Inflammatory Food Consumption and Age-Related Hearing Loss in a Prospective Observational Cohort: Results from the Salus in Apulia Study. Nutrients 2020; 12:E426. [PMID: 32046004 PMCID: PMC7071162 DOI: 10.3390/nu12020426] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 02/03/2020] [Accepted: 02/05/2020] [Indexed: 12/20/2022] Open
Abstract
Age related hearing loss (ARHL) affects about one third of the elderly population. It is suggested that the senescence of the hair cells could be modulated by inflammation. Thus, intake of anti- and pro-inflammatory foods is of high interest. METHODS From the MICOL study population, 734 participants were selected that participated in the 2013 to 2018 examination including hearing ability and from which past data collected in 2005/2008 was available. ARHL status was determined and compared cross-sectionally and retrospectively according to clinical and lifestyle data including food and micronutrient intake. RESULTS ARHL status was associated with higher age but not with education, smoking, relative weight (BMI), and clinical-chemical blood markers in the crossectional and retrospective analyses. Higher intake of fruit juices among ARHL-participants was seen cross-sectionally, and of sugary foods, high-caloric drinks, beer, and spirits retrospectively. No difference was found for the other 26 food groups and for dietary micronutrients with the exception of past vitamin A, which was higher among normal hearing subjects. CONCLUSIONS Pro-inflammatory foods with a high-sugar content and also beer and spirits were found to be assocated with positive ARHL-status, but not anti-inflammatory foods. Diet could be a candidate for lifestyle advice for the prevention of ARHL.
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Affiliation(s)
- Rodolfo Sardone
- Frailty Phenotypes Research Unit, “Salus in Apulia Study”, National Institute of Gastroenterology “Saverio de Bellis”, Research Hospital, Castellana Grotte, 70013 Bari, Italy (F.P.)
| | - Luisa Lampignano
- Frailty Phenotypes Research Unit, “Salus in Apulia Study”, National Institute of Gastroenterology “Saverio de Bellis”, Research Hospital, Castellana Grotte, 70013 Bari, Italy (F.P.)
| | - Vito Guerra
- Data Analysis Unit, National Institute of Gastroenterology “Saverio de Bellis”, Research Hospital, Castellana Grotte, 70013 Bari, Italy; (V.G.)
| | - Roberta Zupo
- Frailty Phenotypes Research Unit, “Salus in Apulia Study”, National Institute of Gastroenterology “Saverio de Bellis”, Research Hospital, Castellana Grotte, 70013 Bari, Italy (F.P.)
| | - Rossella Donghia
- Data Analysis Unit, National Institute of Gastroenterology “Saverio de Bellis”, Research Hospital, Castellana Grotte, 70013 Bari, Italy; (V.G.)
| | - Fabio Castellana
- Frailty Phenotypes Research Unit, “Salus in Apulia Study”, National Institute of Gastroenterology “Saverio de Bellis”, Research Hospital, Castellana Grotte, 70013 Bari, Italy (F.P.)
| | - Petronilla Battista
- Department of Cardiology and Cardiac Rehabilitation, Scientific Clinical Institutes Maugeri, IRCCS Institute of Bari, 70124 Bari, Italy
| | - Ilaria Bortone
- Frailty Phenotypes Research Unit, “Salus in Apulia Study”, National Institute of Gastroenterology “Saverio de Bellis”, Research Hospital, Castellana Grotte, 70013 Bari, Italy (F.P.)
| | - Filippo Procino
- Frailty Phenotypes Research Unit, “Salus in Apulia Study”, National Institute of Gastroenterology “Saverio de Bellis”, Research Hospital, Castellana Grotte, 70013 Bari, Italy (F.P.)
| | - Marco Castellana
- Frailty Phenotypes Research Unit, “Salus in Apulia Study”, National Institute of Gastroenterology “Saverio de Bellis”, Research Hospital, Castellana Grotte, 70013 Bari, Italy (F.P.)
| | - Andrea Passantino
- Department of Cardiology and Cardiac Rehabilitation, Scientific Clinical Institutes Maugeri, IRCCS Institute of Bari, 70124 Bari, Italy
| | - Roberta Rucco
- Frailty Phenotypes Research Unit, “Salus in Apulia Study”, National Institute of Gastroenterology “Saverio de Bellis”, Research Hospital, Castellana Grotte, 70013 Bari, Italy (F.P.)
| | - Madia Lozupone
- Center for Neurodegenerative Diseases and the Aging Brain, University of Bari Aldo Moro, 70100 Bari, Italy
| | - Davide Seripa
- Research Laboratory, Complex Structure of Geriatrics, Department of Medical Sciences, Fondazione IRCCS Casa Sollievo della Sofferenza, San Giovanni Rotondo, 71013 Foggia, Italy
| | - Francesco Panza
- Frailty Phenotypes Research Unit, “Salus in Apulia Study”, National Institute of Gastroenterology “Saverio de Bellis”, Research Hospital, Castellana Grotte, 70013 Bari, Italy (F.P.)
| | - Giovanni De Pergola
- Clinical Nutrition Unit, Medical Oncology, Department of Biomedical Science and Human Oncology, University of Bari Aldo Moro, School of Medicine, 70100 Bari, Italy
| | - Gianluigi Giannelli
- Frailty Phenotypes Research Unit, “Salus in Apulia Study”, National Institute of Gastroenterology “Saverio de Bellis”, Research Hospital, Castellana Grotte, 70013 Bari, Italy (F.P.)
| | - Giancarlo Logroscino
- Center for Neurodegenerative Diseases and the Aging Brain, University of Bari Aldo Moro, 70100 Bari, Italy
- Department of Clinical Research in Neurology, “Pia Fondazione Cardinale G. Panico”, Tricase, 73039 Lecce, Italy
| | - Heiner Boeing
- German Institute of Human Nutrition Potsdam-Rehbrücke, 14558 Nuthetal, Germany
| | - Nicola Quaranta
- Otolaryngology Unit, Department of Basic Medical Science, Neuroscience and Sense Organs, University of Bari Aldo Moro, 70100 Bari, Italy
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12
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Meo SA, Muneif YAB, BenOmran NA, AlSadhan MA, Hashem RF, Alobaisi AS. Prevalence of Pre Diabetes and Type 2 Diabetes Mellitus among cement industry workers. Pak J Med Sci 2020; 36:32-36. [PMID: 32063927 PMCID: PMC6994864 DOI: 10.12669/pjms.36.2.1266] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 09/23/2018] [Accepted: 10/15/2018] [Indexed: 11/15/2022] Open
Abstract
OBJECTIVES Occupational and environmental pollution have become an imperative jeopardy for developing devastating metabolic diseases. Limited animal model studies have examined the impact of exposure to cement dust on metabolic conditions. This study aimed to assess the prevalence of pre-diabetes and Type-2 diabetic mellitus (T2DM) among non-smoking cement mill workers. METHODS This epidemiological cross sectional study was conducted in the "Department of Physiology, College of Medicine, King Saud University, Riyadh, Saudi Arabia" during the period Oct 2016 to June 2017. Initially 310 cement mill workers were interviewed; after the interview and clinical history taking, 186 non-smoking cement mill employees were finally recruited. The cement mill employees were exposed to cement dust-related pollution in a cement industry for eight hours a day for six days a week. The mean age was 36.56 ± 0.78 years, mean BMI was 25.70 ± 0.29 m/kg2, and mean period of employment in the cement industry was 82.77 ± 6.95 months. HbA1c was measured using the Dimension Xpand Plus Integrated Chemistry System (USA). RESULTS The cement mill employees were divided into three groups: non-diabetics group, with glycated hemoglobin (HbA1c) <5.7%; pre-diabetics group, with HbA1c 5.7-6.4%; and diabetics group, with HbA1c >6.4%. Among the cement mill personnel, 79 (42.47%) were non-diabetics, 28 (15.05%) were pre-diabetics, and 79 (42.47%) were diabetics. The prevalence of pre-diabetes and T2DM among cement mill employees was considerably associated with the period of employment in the cement industry (p=0.032). CONCLUSIONS Exposure to cement dust was associated with an increased prevalence of pre- diabetes and T2DM among cement industry employees.
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Affiliation(s)
- Sultan Ayoub Meo
- Dr. Sultan Ayoub Meo, MBBS, PhD. Department of Physiology, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Yasser Abdullah Bin Muneif
- Dr. Yasser Abdullah Bin Muneif, MBBS. Department of Physiology, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Nasser Abdullah BenOmran
- Dr. Nasser Abdullah BenOmran, MBBS. Department of Physiology, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Mohammad Abdullah AlSadhan
- Dr. Mohammad Abdullah AlSadhan, MBBS. Department of Physiology, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Raed Fuad Hashem
- Dr. Raed Fuad Hashem, MBBS, Department of Physiology, College of Medicine, King Saud University, Riyadh, Saudi Arabia
| | - Abdullah Saud Alobaisi
- Dr. Abdullah Saud Alobaisi, MBBS. Department of Physiology, College of Medicine, King Saud University, Riyadh, Saudi Arabia
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Ibrahim BA, Llano DA. Aging and Central Auditory Disinhibition: Is It a Reflection of Homeostatic Downregulation or Metabolic Vulnerability? Brain Sci 2019; 9:brainsci9120351. [PMID: 31805729 PMCID: PMC6955996 DOI: 10.3390/brainsci9120351] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2019] [Revised: 11/25/2019] [Accepted: 11/30/2019] [Indexed: 01/08/2023] Open
Abstract
Aging-related changes have been identified at virtually every level of the central auditory system. One of the most common findings across these nuclei is a loss of synaptic inhibition with aging, which has been proposed to be at the heart of several aging-related changes in auditory cognition, including diminished speech perception in complex environments and the presence of tinnitus. Some authors have speculated that downregulation of synaptic inhibition is a consequence of peripheral deafferentation and therefore is a homeostatic mechanism to restore excitatory/inhibitory balance. As such, disinhibition would represent a form of maladaptive plasticity. However, clinical data suggest that deafferentation-related disinhibition tends to occur primarily in the aged brain. Therefore, aging-related disinhibition may, in part, be related to the high metabolic demands of inhibitory neurons relative to their excitatory counterparts. These findings suggest that both deafferentation-related maladaptive plastic changes and aging-related metabolic factors combine to produce changes in central auditory function. Here, we explore the arguments that downregulation of inhibition may be due to homeostatic responses to diminished afferent input vs. metabolic vulnerability of inhibitory neurons in the aged brain. Understanding the relative importance of these mechanisms will be critical for the development of treatments for the underlying causes of aging-related central disinhibition.
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Affiliation(s)
- Baher A. Ibrahim
- Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA;
| | - Daniel A. Llano
- Department of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA;
- Beckman Institute for Advanced Science and Technology, University of Illinois at Urbana-Champaign, Urbana, IL 61801, USA
- Correspondence:
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Abstract
The relationship between diabetes mellitus (DM) and the auditory/vestibular system has been investigated for more than a century. Most population-based investigations of hearing loss in persons with diabetes (PWD) have revealed a slow progressive, bilateral, high-frequency sensorineural hearing loss. Despite the growing research literature on the pathophysiology of DM-related hearing loss using various animal models and other human studies, knowledge of specific mechanism of the degenerative changes of the inner ear and/or auditory nerve is far from full elucidation. Recent investigations of the mechanisms underlying the association between hearing loss and DM suggest complex combined contributions of hyperglycemia, oxidative stress resulting in cochlear microangiopathy, and auditory neuropathy. An even lesser understood complication of DM is the effect on the vestibular system. Here we provide an overview of animal and human evidence of pathophysiological changes created by DM and its effects on auditory-vestibular anatomy and function.
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Affiliation(s)
- Saravanan Elangovan
- Department of Audiology and Speech-Language Pathology, East Tennessee State University, Johnson City, Tennessee
| | - Christopher Spankovich
- Department of Otolaryngology and Communicative Sciences, University of Mississippi Medical Center, Jackson, Mississippi
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15
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Tang TH, Hwang JH, Yang TH, Hsu CJ, Wu CC, Liu TC. Can Nutritional Intervention for Obesity and Comorbidities Slow Down Age-Related Hearing Impairment? Nutrients 2019; 11:E1668. [PMID: 31330876 PMCID: PMC6682960 DOI: 10.3390/nu11071668] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2019] [Revised: 07/16/2019] [Accepted: 07/19/2019] [Indexed: 01/22/2023] Open
Abstract
BACKGROUND Age-related hearing impairment (ARHI), the most common sensory deficit in the elderly, is associated with enormous social and public health burdens. Emerging evidence has suggested that obesity and comorbidities might increase the risk of ARHI. However, no reviews have been published that address the role of nutritional interventions for obesity and comorbidities in the prevention of ARHI. METHODS A PubMed database search was conducted to identify the relationship between obesity and ARHI. "Obesity", "metabolic syndrome", "adipose-derived hormone", "fatty acid", and "age-related hearing impairment" were included as keywords. RESULTS A total of 89 articles was analyzed with 39 articles of relevance to ARHI. A high-fat diet may induce oxidative stress, mitochondrial damage, and apoptosis in the inner ear. Statins have been shown to delay the progression of ARHI by improving the lipid profile, reducing oxidative stress, and inhibiting endothelial inflammation. Aldosterone could exert protective effects against ARHI by upregulating the Na-K-2Cl co-transporter 1 in the cochlea. Omega-3 polyunsaturated fatty acids could preserve the cochlear microcirculation by reducing dyslipidemia and inhibiting inflammation. Alpha-lipoic acid and lecithin might delay the progression of ARHI by protecting cochlear mitochondrial DNA from damage due to oxidative stress. Tea and ginseng might protect against ARHI through their anti-obesity and anti-diabetic effects. CONCLUSIONS Nutritional interventions for obesity and comorbidities, including a low-fat diet, supplementation with statins, aldosterone, omega-3 polyunsaturated fatty acids, alpha-lipoic acids, lecithin, tea, and ginseng, may protect against the development of ARHI.
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Affiliation(s)
- Ting-Hsuan Tang
- Department of Otolaryngology, National Taiwan University Hospital, Taipei 100, Taiwan
| | - Juen-Haur Hwang
- Department of Otolaryngology-Head and Neck Surgery, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, Chiayi 622, Taiwan
- School of Medicine, Tzu Chi University, Hualien 970, Taiwan
- Department of Medical Research, China Medical University Hospital, China Medical University, Taichung 404, Taiwan
| | - Ting-Hua Yang
- Department of Otolaryngology, National Taiwan University Hospital, Taipei 100, Taiwan
| | - Chuan-Jen Hsu
- School of Medicine, Tzu Chi University, Hualien 970, Taiwan
- Department of Otolaryngology, Taichung Tzu-Chi Hospital, Taichung 427, Taiwan
| | - Chen-Chi Wu
- Department of Otolaryngology, National Taiwan University Hospital, Taipei 100, Taiwan.
- Department of Otolaryngology, National Taiwan University College of Medicine, Taipei 100, Taiwan.
| | - Tien-Chen Liu
- Department of Otolaryngology, National Taiwan University Hospital, Taipei 100, Taiwan.
- Department of Otolaryngology, National Taiwan University College of Medicine, Taipei 100, Taiwan.
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16
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Cohen Atsmoni S, Brener A, Roth Y. Diabetes in the practice of otolaryngology. Diabetes Metab Syndr 2019; 13:1141-1150. [PMID: 31336457 DOI: 10.1016/j.dsx.2019.01.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/06/2018] [Accepted: 01/14/2019] [Indexed: 02/07/2023]
Abstract
Diabetes mellitus is the most common endocrine disease, characterized by chronic hyperglycemia. The hyperglycemic milieu leads to endothelial injury in blood vessels of variant size, which results in microangiopathy and macroangiopathy (atherosclerosis). Consequential ischemia of nerves and hyperglycemia by itself lead to nerve degeneration and generalized neuropathy, affecting most often the sensory peripheral nerves and the autonomic nervous system. Auditory, vestibular and olfactory sensorium may be compromised by DM. People with DM have an increased susceptibility to infection, as a result of neutrophil dysfunction and impaired humoral immunity. Therefore DM predisposes to certain infectious diseases, such as fungal sinusitis or malignant otitis externa, which are rare in general population. Recovery from infections or from injuries may be compromised by coexisting DM. In this review we discuss complications of DM in the head and neck region. Otolaryngologists and general practitioners should be alert to specific conditions related to DM and be minded of the relevant complications and consequences.
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Affiliation(s)
- Smadar Cohen Atsmoni
- Department of Otolaryngology-Head and Neck Surgery, The Edith Wolsfon Medical Center, Holon, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel.
| | - Avivit Brener
- Pediatric Endocrinology & Diabetes Unit, Dana-Dwek Children's Hospital, Tel Aviv Sourasky Medical Center, Tel Aviv, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
| | - Yehudah Roth
- Department of Otolaryngology-Head and Neck Surgery, The Edith Wolsfon Medical Center, Holon, Israel; Sackler Faculty of Medicine, Tel Aviv University, Tel Aviv, Israel
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17
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Villavisanis DF, Schrode KM, Lauer AM. Sex bias in basic and preclinical age-related hearing loss research. Biol Sex Differ 2018; 9:23. [PMID: 29898787 PMCID: PMC6000973 DOI: 10.1186/s13293-018-0185-7] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/20/2018] [Accepted: 05/30/2018] [Indexed: 11/30/2022] Open
Abstract
Objectives This study aims to determine if there is sex bias in basic and preclinical research on age-related hearing loss for the 10-year period of 2006–2015, prior to the NIH mandate of including sex as a biological variable in 2016. Design Manuscripts were identified in PubMed for the query “age-related hearing loss” for the 10-year period of 2006 to 2015. Manuscripts were included if they were original research (not reviews or meta-analyses), written in English, contained an abstract, used animals, and were primarily on age-related hearing loss. These criteria yielded 231 unique manuscripts for inclusion in the study analysis. The text of each manuscript was screened for the sex of the animals, the number of male and female animals, the discussion of sex-based results, the study site (US or international), and the year of publication. Results Only two thirds of manuscripts reported the sex of animals used in the experiments, and of these, 54% used both sexes, 34% used males only, and 13% used females only. In papers reporting sex and number of animals used, 67% were males and 33% were females. Over twice as many internationally based studies used males only compared to US-based studies. Only 15% of all manuscripts discussed sex-based results. Conclusions Sex bias is present in basic and preclinical age-related hearing loss research for the manuscripts screened in the 10-year period. Equal inclusion of both males and females in basic and preclinical age-related hearing loss research is critical for understanding sex-based differences in mechanisms and for effective treatment options.
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Affiliation(s)
- Dillan F Villavisanis
- Department of Otolaryngology-Head and Neck Surgery, Center for Hearing and Balance, Johns Hopkins University School of Medicine, 720 Rutland Ave., Baltimore, MD, 21205, USA.
| | - Katrina M Schrode
- Department of Otolaryngology-Head and Neck Surgery, Center for Hearing and Balance, Johns Hopkins University School of Medicine, 720 Rutland Ave., Baltimore, MD, 21205, USA
| | - Amanda M Lauer
- Department of Otolaryngology-Head and Neck Surgery, Center for Hearing and Balance, Johns Hopkins University School of Medicine, 720 Rutland Ave., Baltimore, MD, 21205, USA
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18
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Ding D, Jiang H, Chen GD, Longo-Guess C, Muthaiah VPK, Tian C, Sheppard A, Salvi R, Johnson KR. N-acetyl-cysteine prevents age-related hearing loss and the progressive loss of inner hair cells in γ-glutamyl transferase 1 deficient mice. Aging (Albany NY) 2017; 8:730-50. [PMID: 26977590 PMCID: PMC4925825 DOI: 10.18632/aging.100927] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2016] [Accepted: 02/18/2016] [Indexed: 02/07/2023]
Abstract
Genetic factors combined with oxidative stress are major determinants of age-related hearing loss (ARHL), one of the most prevalent disorders of the elderly. Dwarf grey mice, Ggt1dwg/dwg, are homozygous for a loss of function mutation of the γ-glutamyl transferase 1 gene, which encodes an important antioxidant enzyme critical for the resynthesis of glutathione (GSH). Since GSH reduces oxidative damage, we hypothesized that Ggt1dwg/dwg mice would be susceptible to ARHL. Surprisingly, otoacoustic emissions and cochlear microphonic potentials, which reflect cochlear outer hair cell (OHC) function, were largely unaffected in mutant mice, whereas auditory brainstem responses and the compound action potential were grossly abnormal. These functional deficits were associated with an unusual and selective loss of inner hair cells (IHC), but retention of OHC and auditory nerve fibers. Remarkably, hearing deficits and IHC loss were completely prevented by N-acetyl-L-cysteine, which induces de novo synthesis of GSH; however, hearing deficits and IHC loss reappeared when treatment was discontinued. Ggt1dwg/dwgmice represent an important new model for investigating ARHL, therapeutic interventions, and understanding the perceptual and electrophysiological consequences of sensory deprivation caused by the loss of sensory input exclusively from IHC.
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Affiliation(s)
- Dalian Ding
- Center for Hearing and Deafness, University at Buffalo, Buffalo, NY 14214, USA
| | - Haiyan Jiang
- Center for Hearing and Deafness, University at Buffalo, Buffalo, NY 14214, USA
| | - Guang-Di Chen
- Center for Hearing and Deafness, University at Buffalo, Buffalo, NY 14214, USA
| | | | | | - Cong Tian
- The Jackson Laboratory, Bar Harbor, ME 04609, USA
| | - Adam Sheppard
- Center for Hearing and Deafness, University at Buffalo, Buffalo, NY 14214, USA
| | - Richard Salvi
- Center for Hearing and Deafness, University at Buffalo, Buffalo, NY 14214, USA
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19
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Noise History and Auditory Function in Young Adults With and Without Type 1 Diabetes Mellitus. Ear Hear 2017; 38:724-735. [DOI: 10.1097/aud.0000000000000457] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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20
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Watson N, Ding B, Zhu X, Frisina RD. Chronic inflammation - inflammaging - in the ageing cochlea: A novel target for future presbycusis therapy. Ageing Res Rev 2017; 40:142-148. [PMID: 29017893 DOI: 10.1016/j.arr.2017.10.002] [Citation(s) in RCA: 97] [Impact Index Per Article: 13.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2017] [Revised: 10/04/2017] [Accepted: 10/06/2017] [Indexed: 12/11/2022]
Abstract
Chronic, low-grade inflammation, or inflammaging, is a crucial contributor to various age-related pathologies and natural processes in aging tissue, including the nervous system. Over the past two decades, much effort has been done to understand the mechanisms of inflammaging in disease models such as type II diabetes, cardiovascular disease, Alzheimer's disease, Parkinson's disease, and others. However, despite being the most prevalent neurodegenerative disorder, the number one communication disorder, and one of the top three chronic medical conditions of our aged population; little research has been conducted on the potential role of inflammation in age-related hearing loss (ARHL). Recently, it has been suggested that there is an inflammatory presence in the cochlea, perhaps involving diffusion processes of the blood-brain barrier as it relates to the inner ear. Recent research has found correlations between hearing loss and markers such as C-reactive protein, IL-6, and TNF-α indicating inflammatory status in human case-cohort studies. However, there have been very few reports of in vivo research investigating the role of chronic inflammation's in hearing loss in the aging cochlea. Future research directed at better understanding the mechanisms of inflammation in the cochlea as well as the natural changes acquired with aging may provide a better understanding of how this process can accelerate presbycusis. Animal model experimentation and pre-clinical studies designed to recognize and characterize cochlear inflammatory mechanisms may suggest novel treatment strategies for preventing or treating ARHL. In this review, we seek to summarize key research in chronic inflammation, discuss its implications for possible roles in ARHL, and finally suggest directions for future investigations.
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Affiliation(s)
- Nathan Watson
- Dept. Biomedical Engineering, Fitzpatrick Center (FCIEMAS), 101 Science Drive, Campus Box 90281, Duke University, Durham, NC 27708-0281, USA; Global Center for Hearing & Speech Res., 3802 Spectrum Blvd., BPB Suite 210, University of South Florida Res. Park, Tampa, FL 33612, USA; Dept. Chemical & Biomedical Engineering, 4202 E Fowler Avenue, ENB 118 University of South Florida, Tampa, FL 33620, USA
| | - Bo Ding
- Dept. Communication Sciences & Disorders, 4202 E. Fowler Avenue, PCD1017 University of South Florida, Tampa, FL 33620-8200, USA; Global Center for Hearing & Speech Res., 3802 Spectrum Blvd., BPB Suite 210, University of South Florida Res. Park, Tampa, FL 33612, USA
| | - Xiaoxia Zhu
- Dept. Communication Sciences & Disorders, 4202 E. Fowler Avenue, PCD1017 University of South Florida, Tampa, FL 33620-8200, USA; Dept. Chemical & Biomedical Engineering, 4202 E Fowler Avenue, ENB 118 University of South Florida, Tampa, FL 33620, USA
| | - Robert D Frisina
- Dept. Communication Sciences & Disorders, 4202 E. Fowler Avenue, PCD1017 University of South Florida, Tampa, FL 33620-8200, USA; Global Center for Hearing & Speech Res., 3802 Spectrum Blvd., BPB Suite 210, University of South Florida Res. Park, Tampa, FL 33612, USA; Dept. Chemical & Biomedical Engineering, 4202 E Fowler Avenue, ENB 118 University of South Florida, Tampa, FL 33620, USA.
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Effects of Long-Term Exercise on Age-Related Hearing Loss in Mice. J Neurosci 2017; 36:11308-11319. [PMID: 27807171 DOI: 10.1523/jneurosci.2493-16.2016] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/05/2016] [Accepted: 09/15/2016] [Indexed: 01/22/2023] Open
Abstract
Regular physical exercise reduces the risk for obesity, cardiovascular diseases, and disability and is associated with longer lifespan expectancy (Taylor et al., 2004; Pahor et al., 2014; Anton et al., 2015; Arem et al., 2015). In contrast, decreased physical function is associated with hearing loss among older adults (Li et al., 2013; Chen et al., 2015). Here, we investigated the effects of long-term voluntary wheel running (WR) on age-related hearing loss (AHL) in CBA/CaJ mice, a well established model of AHL (Zheng et al., 1999). WR activity peaked at 6 months of age (12,280 m/d) and gradually decreased over time. At 24 months of age, the average WR distance was 3987 m/d. Twenty-four-month-old runners had less cochlear hair cell and spiral ganglion neuron loss and better auditory brainstem response thresholds at the low and middle frequencies compared with age-matched, non-WR controls. Gene ontology (GO) enrichment analysis of inner ear tissues from 6-month-old controls and runners revealed that WR resulted in a marked enrichment for GO gene sets associated with immune response, inflammatory response, vascular function, and apoptosis. In agreement with these results, there was reduced stria vascularis (SV) atrophy and reduced loss of capillaries in the SV of old runners versus old controls. Given that SV holds numerous capillaries that are essential for transporting oxygen and nutrients into the cochlea, our findings suggest that long-term exercise delays the progression of AHL by reducing age-related loss of strial capillaries associated with inflammation. SIGNIFICANCE STATEMENT Nearly two-thirds of adults aged 70 years or older develop significant age-related hearing loss (AHL), a condition that can lead to social isolation and major communication difficulties. AHL is also associated with decreased physical function among older adults. In the current study, we show that regular exercise slowed AHL and cochlear degeneration significantly in a well established murine model. Our data suggest that regular exercise delays the progression of AHL by reducing age-related loss of strial capillaries associated with inflammation.
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Hwang JH. Effects of obesity on protein kinase C, brain creatine kinase, transcription, and autophagy in cochlea. Metab Brain Dis 2017; 32:735-742. [PMID: 28144885 DOI: 10.1007/s11011-017-9962-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/28/2016] [Accepted: 01/25/2017] [Indexed: 01/09/2023]
Abstract
Diet-induced obesity (DIO) has been shown to exacerbate hearing degeneration via increased hypoxia, inflammatory responses, and cell loss via both caspase-dependent and caspase-independent apoptosis signaling pathways. This study aimed to investigate the effects of DIO on the mRNA expressions of protein kinase c-β (PKC-β), brain creatine kinase (CKB), transcription modification genes, and autophagy-related genes in the cochlea of CD/1 mice. Sixteen 4-week-old male CD/1 mice were randomly divided into 2 groups. For 16 weeks, the DIO group was fed a high fat diet (60% kcal fat) and the controls were fed a standard diet. Morphometry, biochemistry, auditory brainstem response thresholds, omental fat, and histopathology of the cochlea were compared. Results showed that body weight, body length, body-mass index, omental fat, plasma triglyceride, and auditory brainstem response thresholds were significantly elevated in the DIO group compared with those of the control group. The ratio of vessel wall thickness to radius in the stria vascularis was significantly higher in the DIO group. The cell densities in the spiral ganglion, but not in the spiral prominence, of the cochlea were significantly lower in the DIO group. The expression of histone deacetylation gene 1 (HDAC1) was significantly higher in the DIO group than the control group. However, the expressions of PKC-β, CKB, HDAC3, histone acetyltransferase gene (P300), lysosome-associated membrane protein 2 (Lamp2), and light chain 3 (Lc3) genes were not significantly different between two groups. These results suggest that DIO might exacerbate hearing degeneration possibly via increased HDAC1 gene expression in the cochlea of CD/1 mice.
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Affiliation(s)
- Juen-Haur Hwang
- Department of Otolaryngology, Dalin Tzu Chi Hospital, Buddhist Tzu Chi Medical Foundation, No. 2, Minsheng Road, Dalin, Chiayi, 62247, Taiwan.
- School of Medicine, Tzu Chi University, Hualien, Taiwan.
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Romano S, Mitro N, Diviccaro S, Spezzano R, Audano M, Garcia-Segura LM, Caruso D, Melcangi RC. Short-term effects of diabetes on neurosteroidogenesis in the rat hippocampus. J Steroid Biochem Mol Biol 2017; 167:135-143. [PMID: 27890531 DOI: 10.1016/j.jsbmb.2016.11.019] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Revised: 11/12/2016] [Accepted: 11/22/2016] [Indexed: 12/31/2022]
Abstract
Diabetes may induce neurophysiological and structural changes in the central nervous system (i.e., diabetic encephalopathy). We here explored whether the levels of neuroactive steroids (i.e., neuroprotective agents) in the hippocampus may be altered by short-term diabetes (i.e., one month). To this aim, by liquid chromatography-tandem mass spectrometry we observed that in the experimental model of the rat raised diabetic by streptozotocin injection, one month of pathology induced changes in the levels of several neuroactive steroids, such as pregnenolone, progesterone and its metabolites (i.e., tetrahydroprogesterone and isopregnanolone) and testosterone and its metabolites (i.e., dihydrotestosterone and 3α-diol). Interestingly these brain changes were not fully reflected by the plasma level changes, suggesting that early phase of diabetes directly affects steroidogenesis and/or steroid metabolism in the hippocampus. These concepts are also supported by the findings that crucial steps of steroidogenic machinery, such as the gene expression of steroidogenic acute regulatory protein (i.e., molecule involved in the translocation of cholesterol into mitochondria) and cytochrome P450 side chain cleavage (i.e., enzyme converting cholesterol into pregnenolone) and 5α-reductase (enzyme converting progesterone and testosterone into their metabolites) are also affected in the hippocampus. In addition, cholesterol homeostasis as well as the functionality of mitochondria, a key organelle in which the limiting step of neuroactive steroid synthesis takes place, are also affected. Data obtained indicate that short-term diabetes alters hippocampal steroidogenic machinery and that these changes are associated with impaired cholesterol homeostasis and mitochondrial dysfunction in the hippocampus, suggesting them as relevant factors for the development of diabetic encephalopathy.
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Affiliation(s)
- Simone Romano
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, 20133 Milan, Italy
| | - Nico Mitro
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, 20133 Milan, Italy
| | - Silvia Diviccaro
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, 20133 Milan, Italy
| | - Roberto Spezzano
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, 20133 Milan, Italy
| | - Matteo Audano
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, 20133 Milan, Italy
| | | | - Donatella Caruso
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, 20133 Milan, Italy.
| | - Roberto Cosimo Melcangi
- Dipartimento di Scienze Farmacologiche e Biomolecolari, Università degli Studi di Milano, 20133 Milan, Italy.
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Dhanda N, Taheri S. A narrative review of obesity and hearing loss. Int J Obes (Lond) 2017; 41:1066-1073. [PMID: 28163314 DOI: 10.1038/ijo.2017.32] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Revised: 12/18/2016] [Accepted: 01/23/2017] [Indexed: 12/20/2022]
Abstract
The comorbidities related to obesity are already extensive, but as the prevalence of obesity increases globally, so do the number of its associated conditions. The relationship between hearing impairment and obesity is a relatively recent research interest, but is significant as both conditions have the ability to substantially reduce an individual's quality of life both physically and psychologically. Obesity has a significant effect on vascular function, and this may have an impact on highly vascular organs such as the auditory system. This review aims to provide an overview of the existing literature surrounding the association between hearing loss and obesity, in order to emphasise these two highly prevalent conditions, and to identify areas of further investigation. Our literature search identified a total of 298 articles with 11 articles of relevance to the review. The existing literature in this area is sparse, with interest ranging from obesity and its links to age-related hearing impairment (ARHI) and sudden sensorineural hearing loss (SSNHL), to animal models and genetic syndromes that incorporate both disorders. A key hypothesis for the underlying mechanism for the relationship between obesity and hearing loss is that of vasoconstriction in the inner ear, whereby strain on the capillary walls due to excess adipose tissue causes damage to the delicate inner ear system. The identified articles in this review have not established a causal relationship between obesity and hearing impairment. Further research is required to examine the emerging association between obesity and hearing impairment, and identify its potential underlying mechanisms.
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Affiliation(s)
- N Dhanda
- Clinical Research Core, Weill Cornell Medicine-Qatar, Education City, Qatar Foundation, Doha, Qatar
| | - S Taheri
- Clinical Research Core, Weill Cornell Medicine-Qatar, Education City, Qatar Foundation, Doha, Qatar.,Department of Medicine, Weill Cornell Medicine, New York, NY, USA
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25
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Degerman E, in 't Zandt R, Pålbrink A, Eliasson L, Cayé-Thomasen P, Magnusson M. Inhibition of phosphodiesterase 3, 4, and 5 induces endolymphatic hydrops in mouse inner ear, as evaluated with repeated 9.4T MRI. Acta Otolaryngol 2017; 137:8-15. [PMID: 27685753 DOI: 10.1080/00016489.2016.1211320] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
CONCLUSION The data indicate important roles for phosphodiesterase (PDE) 3, 4, 5, and related cAMP and cGMP pools in the regulation of inner ear fluid homeostasis. Thus, dysfunction of these enzymes might contribute to pathologies of the inner ear. OBJECTIVE The mechanisms underlying endolymphatic hydrops, a hallmark of inner ear dysfunction, are not known in detail; however, altered balance in cAMP and cGMP signaling systems appears to be involved. Key components of these systems are PDEs, enzymes that modulate the amplitude, duration, termination, and specificity of cAMP and cGMP signaling. METHOD To evaluate the role of PDE3, 4, and 5 and associated cAMP and cGMP pools in inner ear function, the effect of cilostamide (PDE3 inhibitor), rolipram (PDE4 inhibitor), and sildenafil (PDE5 inhibitor), administrated via mini-osmotic pumps, on mouse inner ear fluid homeostasis was evaluated using 9.4T in vivo MRI in combination with intraperitoneally administered Gadolinium contrast. Also, using human saccule as a model, the expression of PDEs and related signaling molecules and targets was studied using immunohistochemistry. RESULTS PDE3, PDE4, as well as PDE5 inhibitors resulted in the development of endolymphatic hydrops. Furthermore, PDE3B, PDE4D, and some related signaling components were shown to be expressed in the human saccule.
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Topsakal S, Ozmen O, Aslankoc R, Aydemir DH. Pancreatic damage induced by cigarette smoke: the specific pathological effects of cigarette smoke in the rat model. Toxicol Res (Camb) 2016; 5:938-945. [PMID: 30090402 DOI: 10.1039/c5tx00496a] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/30/2015] [Accepted: 03/14/2016] [Indexed: 02/04/2023] Open
Abstract
In recent years, pancreatic pathologies have become common problems and their etiology and pathogenesis are generally unknown. Studies have shown that smoking may increase the risk of pancreatic disorders but very scant knowledge is available about the pathogenesis of cigarette induced pancreatic pathology. This study aimed to evaluate the oxidative stress status, biochemical, pathological and immunohistochemical findings of rats exposed to cigarette smoke, pathogenesis of smoking related pancreatic damage and usability of Alpha Lipoic Acid (ALA) for amelioration of cigarette smoking induced harmful effects on rat pancreas. Twenty eight female, Sprague Dawley rats were randomly distributed into three groups. The sham group (S) (n = 8), rats were given 0.1 ml of physiological serum by oral gavage for 8 weeks. The cigarette smoke exposed group (CSE) (n = 10), rats were exposed to successive periods of cigarette smoke for 2 hours per day per 8 weeks and given 0.1 ml of physiological serum orally during the study. The cigarette smoke exposed and ALA treated group (CSE + ALA) (n = 10), animals were exposed to cigarette smoke (2 hours per day per 8 weeks) and simultaneously treated with 100 mg per kg per day ALA orally during the study. At the end of the study, the serum samples were collected for insulin, glucagon, glucose and amylase analyses. Tissue samples were collected for biochemical, histopathological and immunohistochemical examinations. Total oxidant status (TOS), total antioxidant status (TAS) levels and oxidative stress index (OSI) were evaluated in the pancreas samples. Immunohistochemical analyses of insulin, glucagon, calcitonin gene related protein (CGRP), active caspase-3, hypoxia inducible factor-1 (Hif-1), Hif-2 and tumor necrosis factor (TNF-α) expressions of pancreas were examined. Cigarette smoke caused statistically significant increase in serum amylase and glucose but decreased insulin levels indicating both endocrine and exocrine cell damage. There were no statistically significant differences in serum glucagon levels between the groups. Histopathological examination of the pancreas exhibited generally normal tissue architecture but slightly degenerative and apoptotic cells were noticed both in the endocrine and exocrine part of the pancreas in the CSE group. Immunohistochemical analyses revealed marked increase in active caspase-3, Hif-1 and Hif-2, CGRP and TNF-α expressions with a slight increase in glucagon immunoreactivity in cells while a marked decrease was observed in insulin expression in some Langerhans islets in the CSE group. ALA ameliorated biochemical and pathological findings in the CSE + ALA group. These findings clearly demonstrated that cigarette smoke can cause damage in both endocrine and exocrine cells in rat pancreas and ALA has an ameliorative effect of cigarette induced lesions.
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Affiliation(s)
- Senay Topsakal
- Department of Endocrinology and Metabolism , Pamukkale University , Faculty of Medicine , Kinikli Campus , Denizli , 20070 , Turkey
| | - Ozlem Ozmen
- Department of Pathology , Mehmet Akif Ersoy University , Faculty of Veterinary Medicine , Istiklal Yerleskesi , 15030 , Burdur , Turkey . ; Tel: +90 248 2132170
| | - Rahime Aslankoc
- Department of Physiology , Faculty of Medicine , Suleyman Demirel University , 32200 , Isparta , Turkey
| | - Demet Hancer Aydemir
- Department of Medical Laboratory , Health Vocational Schools , Suleyman Demirel University , 32200 , Isparta , Turkey
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Abstract
Hearing impairment (HI) and type 2 diabetes are both highly prevalent disabling conditions. Type 2 diabetes has been modestly associated with a higher likelihood of HI in many, but not all, population-based studies, with stronger associations found in studies that included younger age groups. Pathophysiologic studies suggest that persons with diabetes are predisposed to HI in the higher frequencies. Proposed mechanisms underlying the association between diabetes and HI include the combined contributions of hyperglycemia and oxidative stress to cochlear microangiopathy and auditory neuropathy. In this review, we highlight recent population-based studies of type 2 diabetes and HI and examine evidence for diabetes-induced pathophysiologic changes that may result in damage to the auditory system.
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Affiliation(s)
- Elizabeth Purchase Helzner
- Department of Epidemiology and Biostatistics, School of Public Health, SUNY Downstate Medical Center, 450 Clarkson Avenue, Mail Stop 43, Brooklyn, NY, 11203, USA.
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Tanigawa T, Shibata R, Kondo K, Katahira N, Kambara T, Inoue Y, Nonoyama H, Horibe Y, Ueda H, Murohara T. Soybean β-Conglycinin Prevents Age-Related Hearing Impairment. PLoS One 2015; 10:e0137493. [PMID: 26348726 PMCID: PMC4562634 DOI: 10.1371/journal.pone.0137493] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2015] [Accepted: 08/18/2015] [Indexed: 11/19/2022] Open
Abstract
Obesity-related complications are associated with the development of age-related hearing impairment. β-Conglycinin (β-CG), one of the main storage proteins in soy, offers multiple health benefits, including anti-obesity and anti-atherosclerotic effects. Here, to elucidate the potential therapeutic application of β-CG, we investigated the effect of β-CG on age-related hearing impairment. Male wild-type mice (age 6 months) were randomly divided into β-CG-fed and control groups. Six months later, the body weight was significantly lower in β-CG-fed mice than in the controls. Consumption of β-CG rescued the hearing impairment observed in control mice. Cochlear blood flow also increased in β-CG-fed mice, as did the expression of eNOS in the stria vascularis (SV), which protects vasculature. β-CG consumption also ameliorated oxidative status as assessed by 4-HNE staining. In the SV, lipofuscin granules of marginal cells and vacuolar degeneration of microvascular pericytes were decreased in β-CG-fed mice, as shown by transmission electron microscopy. β-CG consumption prevented loss of spiral ganglion cells and reduced the frequencies of lipofuscin granules, nuclear invaginations, and myelin vacuolation. Our observations indicate that β-CG ameliorates age-related hearing impairment by preserving cochlear blood flow and suppressing oxidative stress.
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Affiliation(s)
- Tohru Tanigawa
- Department of Otolaryngology, Aichi Medical University, Aichi, Japan
| | - Rei Shibata
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Kazuhisa Kondo
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Nobuyuki Katahira
- Department of Otolaryngology, Aichi Medical University, Aichi, Japan
| | - Takahiro Kambara
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Yoko Inoue
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Hiroshi Nonoyama
- Department of Otolaryngology, Aichi Medical University, Aichi, Japan
| | - Yuichiro Horibe
- Department of Otolaryngology, Aichi Medical University, Aichi, Japan
| | - Hiromi Ueda
- Department of Otolaryngology, Aichi Medical University, Aichi, Japan
| | - Toyoaki Murohara
- Department of Cardiology, Nagoya University Graduate School of Medicine, Nagoya, Japan
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Fujita T, Yamashita D, Uehara N, Inokuchi G, Hasegawa S, Otsuki N, Nibu KI. A high-fat diet delays age-related hearing loss progression in C57BL/6J mice. PLoS One 2015; 10:e0117547. [PMID: 25625852 PMCID: PMC4308197 DOI: 10.1371/journal.pone.0117547] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2014] [Accepted: 12/29/2014] [Indexed: 11/24/2022] Open
Abstract
Objective Age-related hearing loss (AHL), or presbycusis, is the most common sensory disorder among the elderly. We used C57BL/6J mice as an AHL model to determine a possible association between AHL and a high-fat diet (HFD). Methods Forty C57BL/6J mice were randomly assigned to a control or HFD group. Each group was divided into the following subgroups: 1-, 3-, 5- and 12-month groups (HFD, n = 5/subgroup; control, n = 5/subgroup). Nine CBA/N-slc mice were also used as a 12-month control (n = 5) or 12-month HFD (n = 4) group. The mice were fed a HFD or normal (control) diet throughout this study. Hearing function was evaluated at 1, 3, 5 and 12 months using auditory evoked brainstem responses (ABRs). Spiral ganglion cells (SGCs) were also counted. Results The elevation of ABR thresholds (at 4 and 32 kHz) at 3 and 5 months was significantly suppressed in the HFD group compared with the control groups for C57BL/6J mice. After 12 months, the elevation of ABR thresholds was significantly suppressed in the HFD group at all frequencies for C57BL/6J mice. In contrast, CBA/N-slc mice displayed opposite outcomes, as ABR thresholds at all frequencies at 12 months were significantly elevated in the HFD group compared with the control group. For the C57BL/6J mice at 12 months, SGC numbers significantly decreased in all parts of the cochleae in the control group compared with the HFD groups. In contrast, for the CBA/N-slc mice, SGC numbers significantly decreased, particularly in the upper parts of the cochleae in the HFD group compared with the control groups. Conclusions The elevation in ABR thresholds and SGC loss associated with aging in the HFD-fed C57BL/6J mice were significantly suppressed compared with those in the normal diet-fed mice. These results suggest that HFD delays AHL progression in the C57B/6J mice.
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Affiliation(s)
- Takeshi Fujita
- Department of Otolaryngology-Head and Neck Surgery, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Daisuke Yamashita
- Department of Otolaryngology-Head and Neck Surgery, Kobe University Graduate School of Medicine, Kobe, Japan
- * E-mail:
| | - Natsumi Uehara
- Department of Otolaryngology-Head and Neck Surgery, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Go Inokuchi
- Department of Otolaryngology-Head and Neck Surgery, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Shingo Hasegawa
- Department of Otolaryngology-Head and Neck Surgery, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Naoki Otsuki
- Department of Otolaryngology-Head and Neck Surgery, Kobe University Graduate School of Medicine, Kobe, Japan
| | - Ken-ichi Nibu
- Department of Otolaryngology-Head and Neck Surgery, Kobe University Graduate School of Medicine, Kobe, Japan
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Adiponectin deficiency exacerbates age-related hearing impairment. Cell Death Dis 2014; 5:e1189. [PMID: 24763046 PMCID: PMC4001299 DOI: 10.1038/cddis.2014.140] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Revised: 02/06/2014] [Accepted: 02/24/2014] [Indexed: 12/02/2022]
Abstract
Obesity-related disorders are closely associated with the development of age-related hearing impairment (ARHI). Adiponectin (APN) exerts protective effects against obesity-related conditions including endothelial dysfunction and atherosclerosis. Here, we investigated the impact of APN on ARHI. APN-knockout (APN-KO) mice developed exacerbation of hearing impairment, particularly in the high frequency range, compared with wild-type (WT) mice. Supplementation with APN prevented the hearing impairment in APN-KO mice. At 2 months of age, the cochlear blood flow and capillary density of the stria vascularis (SV) were significantly reduced in APN-KO mice as compared with WT mice. APN-KO mice also showed a significant increase in terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL)-positive apoptotic cells in the organ of Corti in the cochlea at 2 months of age. At the age of 6 months, hair cells were lost at the organ of Corti in APN-KO mice. In cultured auditory HEI-OC1 cells, APN reduced apoptotic activity under hypoxic conditions. Clinically, plasma APN levels were significantly lower in humans with ARHI. Multiple logistic regression analysis identified APN as a significant and independent predictor of ARHI. Our observations indicate that APN has an important role in preventing ARHI.
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Distinction between auditory electrophysiological responses in type 1 and type 2 diabetic animal models. Neurosci Lett 2014; 566:309-14. [DOI: 10.1016/j.neulet.2014.02.060] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2013] [Revised: 02/07/2014] [Accepted: 02/26/2014] [Indexed: 12/13/2022]
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Xipeng L, Ruiyu L, Meng L, Yanzhuo Z, Kaosan G, Liping W. Effects of Diabetes on Hearing and Cochlear Structures. J Otol 2013. [DOI: 10.1016/s1672-2930(13)50017-1] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022] Open
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Meo SA, Alkahlan MA, Al-mubarak MA, Al-obayli MS, Melaibary BA, Dous ANB, Alhassoun AI. Impact of type 1 diabetes mellitus on academic performance. J Int Med Res 2013; 41:855-8. [DOI: 10.1177/0300060513483417] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Objective To examine the effect of type 1 diabetes on academic performance. Methods Ethnically Saudi students with type 1 diabetes, and age, sex, ethnicity and socio-economic status-matched nondiabetic control students were recruited from eight schools. Overall academic grades were recorded, based on the scores obtained in written examinations in English, mathematics, physics, chemistry, biology and humanities. Results Students with type 1 diabetes ( n = 36) obtained significantly lower academic grades compared with their nondiabetic control classmates ( n = 36) (86.58 ± 1.48 vs 90.62 ± 1.36). Conclusions Overall academic performance is significantly lower in students with type 1 diabetes compared with their nondiabetic classmates. This decline in academic performance may be explained by an association between diabetes and cognitive function.
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Affiliation(s)
- Sultan Ayoub Meo
- Department of Physiology, College of Medicine, King Khalid University Hospital, King Saud University, Riyadh, Saudi Arabia
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Hwang JH, Hsu CJ, Yu WH, Liu TC, Yang WS. Diet-induced obesity exacerbates auditory degeneration via hypoxia, inflammation, and apoptosis signaling pathways in CD/1 mice. PLoS One 2013; 8:e60730. [PMID: 23637762 PMCID: PMC3637206 DOI: 10.1371/journal.pone.0060730] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2012] [Accepted: 03/01/2013] [Indexed: 01/08/2023] Open
Abstract
The aim of this study was to investigate the mechanisms of diet-induced obesity on hearing degeneration in CD/1 mice. Sixty 4-week-old male CD/1 mice were randomly and equally divided into 2 groups. For 16 weeks, the diet-induced obesity (DIO) group was fed a high fat diet and the control group was fed a standard diet of 13.43 % kcal fat. The morphometry, biochemistry, auditory brainstem response thresholds, omental fat, and histopathology of the cochlea were compared between the beginning and end of the study (4 vs. 20 weeks old). The results show that the body weight, fasting plasma triglyceride concentrations, and omental fat weight were higher in the DIO group than in the control group at the end of experiment. The auditory brainstem response thresholds at high frequencies were significantly elevated in the DIO group compared to those of the control group. Histology studies showed that, compared to the control group, the DIO group had blood vessels with smaller diameters and thicker walls in the stria vascularis at the middle and basal turns of the cochlea. The cell densities in the spiral ganglion and spiral ligament at the basal turn of the cochlea were significantly lower in the DIO group. Immunohistochemical staining showed that hypoxia-induced factor 1 (HIF-1), tumor necrosis factor alpha (TNF-α), nuclear factor kappa B (NF-κB), caspase 3, poly(ADP-ribose) polymerase-1, and apoptosis inducing factor were all significantly more dense in the spiral ganglion and spiral ligament at the basal turn of cochlea in the DIO group. Our results suggest that diet-induced obesity exacerbates hearing degeneration via increased hypoxia, inflammatory responses, and cell loss in the spiral ganglion and spiral ligament and is associated with the activation of both caspase-dependent and -independent apoptosis signaling pathways in CD/1 mice.
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Affiliation(s)
- Juen-Haur Hwang
- Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
- Department of Otolaryngology, Buddhist Dalin Tzu-Chi General Hospital, Chiayi, Taiwan
- School of Medicine, Tzu Chi University, Hualien, Taiwan
| | - Chuan-Jen Hsu
- Department of Otolaryngology, National Taiwan University, Hospital, Taipei, Taiwan
| | - Wei-Hsuan Yu
- Institute of Biochemistry and Molecular Biology, College of Medicine, National Taiwan University, Taipei, Taiwan
| | - Tien-Chen Liu
- Department of Otolaryngology, National Taiwan University, Hospital, Taipei, Taiwan
- * E-mail: (WSY); (TCL)
| | - Wei-Shiung Yang
- Graduate Institute of Clinical Medicine, College of Medicine, National Taiwan University, Taipei, Taiwan
- Department of Internal Medicine, National Taiwan University, Hospital, Taipei, Taiwan
- Research Center for Developmental Biology and Regenerative Medicine, National Taiwan University, Taipei, Taiwan
- * E-mail: (WSY); (TCL)
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Degerman E, Rauch U, Lindberg S, Caye-Thomasen P, Hultgårdh A, Magnusson M. Expression of insulin signalling components in the sensory epithelium of the human saccule. Cell Tissue Res 2013; 352:469-78. [DOI: 10.1007/s00441-013-1614-x] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2012] [Accepted: 03/08/2013] [Indexed: 12/24/2022]
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Fujita T, Yamashita D, Katsunuma S, Hasegawa S, Tanimoto H, Nibu KI. Increased inner ear susceptibility to noise injury in mice with streptozotocin-induced diabetes. Diabetes 2012; 61:2980-6. [PMID: 22851574 PMCID: PMC3478526 DOI: 10.2337/db11-1845] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We aimed to investigate the pathophysiology of diabetes-associated hearing impairment in type 1 diabetes using mice with streptozotocin-induced diabetes (C57BL/6J; male). Hearing function was evaluated 1, 3, and 5 months after induction of diabetes (five diabetic and five control animals per time point) using auditory-evoked brain stem responses (ABRs). Mice (four diabetic and four control) were exposed to loud noise (105 dB) 5 months after induction of diabetes. ABRs were measured before and after noise exposure. Cochlear blood flows were measured by laser-Doppler flowmeter. Spiral ganglion cells (SGCs) were counted. Vessel endothelial cells were observed by CD31 immunostaining. Chronologic changes in the ABR threshold shift were not significantly different between the diabetic and control groups. However, vessel walls in the modiolus of the cochleae were significantly thicker in the diabetic group than the control group. Additionally, recovery from noise-induced injury was significantly impaired in diabetic mice. Reduced cochlea blood flows and SGC loss were observed in diabetic mice cochleae after noise exposure. Our data suggest that diabetic cochleae are more susceptible than controls to loud noise exposure, and decreased cochlear blood flow due to sclerosis of the vessels and consequent loss of SGCs are possible mechanisms of hearing impairment in diabetic patients.
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MESH Headings
- Animals
- Cell Count
- Cochlea/blood supply
- Cochlea/pathology
- Diabetes Mellitus, Type 1/complications
- Diabetes Mellitus, Type 1/metabolism
- Diabetes Mellitus, Type 1/pathology
- Diabetes Mellitus, Type 1/physiopathology
- Disease Susceptibility
- Ear, Inner/blood supply
- Ear, Inner/pathology
- Ear, Inner/physiopathology
- Endothelial Cells/metabolism
- Endothelial Cells/pathology
- Evoked Potentials, Auditory, Brain Stem
- Hearing Loss, Noise-Induced/complications
- Hearing Loss, Noise-Induced/rehabilitation
- Laser-Doppler Flowmetry
- Male
- Mice
- Mice, Inbred C57BL
- Microcirculation
- Microvessels/pathology
- Microvessels/physiopathology
- Platelet Endothelial Cell Adhesion Molecule-1/metabolism
- Random Allocation
- Sclerosis
- Spiral Ganglion/pathology
- Streptozocin
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Affiliation(s)
- Takeshi Fujita
- Department of Otolaryngology–Head and Neck Surgery, Kobe University Graduate School of Medicine, Kobe, Japan.
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Du Z, Yang Y, Hu Y, Sun Y, Zhang S, Peng W, Zhong Y, Huang X, Kong W. A long-term high-fat diet increases oxidative stress, mitochondrial damage and apoptosis in the inner ear of d-galactose-induced aging rats. Hear Res 2012; 287:15-24. [DOI: 10.1016/j.heares.2012.04.012] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2012] [Revised: 03/19/2012] [Accepted: 04/12/2012] [Indexed: 12/17/2022]
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Murillo-Cuesta S, Camarero G, González-Rodríguez A, De La Rosa LR, Burks DJ, Avendaño C, Valverde AM, Varela-Nieto I. Insulin receptor substrate 2 (IRS2)-deficient mice show sensorineural hearing loss that is delayed by concomitant protein tyrosine phosphatase 1B (PTP1B) loss of function. Mol Med 2012; 18:260-9. [PMID: 22160220 DOI: 10.2119/molmed.2011.00328] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2011] [Accepted: 11/29/2011] [Indexed: 01/28/2023] Open
Abstract
The insulin receptor substrate (IRS) proteins are key mediators of insulin and insulinlike growth factor 1 (IGF-1) signaling. Protein tyrosine phosphatase (PTP)-1B dephosphorylates and inactivates both insulin and IGF-1 receptors. IRS2-deficient mice present altered hepatic insulin signaling and β-cell failure and develop type 2-like diabetes. In addition, IRS2 deficiency leads to developmental defects in the nervous system. IGF1 gene mutations cause syndromic sensorineural hearing loss in humans and mice. However, the involvement of IRS2 and PTP1B, two IGF-1 downstream signaling mediators, in hearing onset and loss has not been studied. Our objective was to study the hearing function and cochlear morphology of Irs2-null mice and the impact of PTP1B deficiency. We have studied the auditory brainstem responses and the cochlear morphology of systemic Irs2⁻/⁻Ptpn1⁺/⁺, Irs2⁺/⁺Ptpn1⁻/⁻ and Irs2⁻/⁻Ptpn1⁻/⁻ mice at different postnatal ages. The results indicated that Irs2⁻/⁻Ptpn1⁺/⁺ mice present a profound congenital sensorineural deafness before the onset of diabetes and altered cochlear morphology with hypoinnervation of the cochlear ganglion and aberrant stria vascularis, compared with wild-type mice. Simultaneous PTP1B deficiency in Irs2⁻/⁻Ptpn1⁻/⁻ mice delays the onset of deafness. We show for the first time that IRS2 is essential for hearing and that PTP1B inhibition may be useful for treating deafness associated with hyperglycemia and type 2 diabetes.
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Affiliation(s)
- Silvia Murillo-Cuesta
- Institute of Biomedical Research "Alberto Sols" (IIBM), Spanish National Research Council-Autonomous University of Madrid-CSIC-UAM, Madrid, Spain.
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