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Eravcı FC, Kaplan Ö, Kılınç F, Doğan M, Arbağ H, Orhan M. Preventive Effect of Controlled-Release Dexamethasone on Cochlear Ossification in Meningitis Model. Ann Otol Rhinol Laryngol 2025:34894251322616. [PMID: 39991894 DOI: 10.1177/00034894251322616] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/25/2025]
Abstract
OBJECTIVE Despite vaccination and early antibiotic treatment, pneumococcal meningitis remains a disease with significant mortality and morbidity. The resulting inflammatory response can lead to cochlear fibrosis, ossification where cochlear implant surgeries are far challenging. Our study aimed to investigate the preventive effect of controlled-release dexamethasone implant in such cases in terms of structural integrity. METHODS Twenty-four rats were induced with pneumococcal meningitis and randomized into study (n = 16) and control (n = 8) groups. Controlled-release dexamethasone implants were placed transbullarly into the right round window of the study group. Bilateral cochleas underwent histological examination 3 months post-infection. RESULTS In the study, cochlear effects of pneumococcal meningitis were evaluated. The basal turn was significantly more affected by fibrosis and ossification (P = .013 and .010, respectively). Compared with control ears, the dexamethasone implant group showed less fibrosis in all turns and less ossification in the basal turn (P = .014, .003, .044, and .035, respectively). CONCLUSION In pneumococcal meningitis, fibrosis and ossification occur more intensively in the basal turn of the cochlea. Controlled-release dexamethasone implants are effective in preventing cochlear ossification and fibrosis. The prevention from the structural damage indicates the potential role of these dexamethasone implants in post-meningitic hearing loss and easing cochlear implant surgeries.
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Affiliation(s)
- Fakih Cihat Eravcı
- Medical Faculty, Department of Otorhinolaryngology, Necmettin Erbakan University, Konya, Turkey
| | - Ömer Kaplan
- Seydişehir State Hospital, Ear Nose and Throat Clinic, Konya, Turkey
| | - Fahriye Kılınç
- Medical Faculty, Department of Pathology, Necmettin Erbakan University, Konya, Turkey
| | - Metin Doğan
- Medical Faculty, Department of Medical Microbiology, Necmettin Erbakan University, Konya, Turkey
| | - Hamdi Arbağ
- Medical Faculty, Department of Otorhinolaryngology, Necmettin Erbakan University, Konya, Turkey
| | - Miyase Orhan
- Medical Faculty, Department of Otorhinolaryngology, Necmettin Erbakan University, Konya, Turkey
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Liu YC, Xu K. Macrophage-related immune responses in inner ear: a potential therapeutic target for sensorineural hearing loss. Front Neurosci 2024; 17:1339134. [PMID: 38274500 PMCID: PMC10808290 DOI: 10.3389/fnins.2023.1339134] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2023] [Accepted: 12/22/2023] [Indexed: 01/27/2024] Open
Abstract
Hearing loss is the most common sensory disorder in human beings. Cochlear sensory cells are the basis of hearing. Cochlear sensory cells suffer from various acute or chronic injuries, such as excessive sound stimulation, ototoxic drugs, and age-related degeneration. In response to these stresses, the cochlea develops an immune response. In recent years, studies have shown that the immune response of the inner ear has been regarded as one of the important pathological mechanisms of inner ear injury. Therapeutic interventions for inflammatory responses can effectively alleviate different types of inner ear injury. As the main immune cells in the inner ear, macrophages are involved in the process of inner ear injury caused by various exogenous factors. However, its specific role in the immune response of the inner ear is still unclear. This review focuses on discusses the dynamic changes of macrophages during different types of inner ear injury, and clarifies the potential role of macrophage-related immune response in inner ear injury.
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Affiliation(s)
- Yu-Chen Liu
- Queen Mary School, Jiangxi Medical College, Nanchang University, Nanchang, China
| | - Kai Xu
- Department of Otolaryngology, Head and Neck Surgery, The Second Affiliated Hospital of Nanchang University, Jiangxi Medical College, Nanchang University, Nanchang, China
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Kilic K, Sakat MS, Sahin A, Yildirim S, Dortbudak MB. The effectiveness of berberine on noise-induced hearing loss: a rat model. Rev Assoc Med Bras (1992) 2022; 68:1330-1336. [PMID: 36228267 PMCID: PMC9575033 DOI: 10.1590/1806-9282.20220758] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Accepted: 07/04/2022] [Indexed: 11/07/2022] Open
Abstract
OBJECTIVE: Noise-induced hearing loss is a preventable form of hearing loss that has serious social and economic impacts. This study aimed to investigate the protective effect of berberine, a potent antioxidant and anti-inflammatory agent, against Noise-induced hearing loss. METHODS: After applying distortion product otoacoustic emission, 28 female Sprague-Dawley rats were randomly divided into four groups. Group 1 was designated as acoustic trauma group, and rats in this group were exposed to white noise for 12 h at an intensity of 4 kHz 110 dB sound pressure level. Group 2 was the control group. Group 3 was designated as the berberine group, and 100 mg/kg of berberine was administered to rats in this group by intragastric lavage for five consecutive days. Group 4 was designated as the acoustic trauma+berberine group. distortion product otoacoustic emission was repeated on the 6th day of the study and cochlear tissues of rats were dissected for histopathological and immunohistochemical analyses after sacrificing rats. RESULTS: The distortion product otoacoustic emission results showed a significant decrease in signal-noise ratio values at higher frequencies in rats of the trauma group compared to those in other groups. Acoustic trauma caused severe histopathological impairment at cochlear structures together with severe 8-hydroxy-2-deoxyguanosine expression. Rats in the acoustic trauma+berberine group showed mild histopathological changes with mild 8-hydroxy-2-deoxyguanosine expression and better signal-noise ratio values. CONCLUSION: The histopathological and audiological findings of this experimental study showed that berberine provides protection in Noise-induced hearing loss and may have the potential for use in acoustic trauma-related hearing losses.
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Affiliation(s)
- Korhan Kilic
- Ataturk University, Faculty of Medicine, Department of Otorhinolaryngology – Erzurum, Turkey.,Corresponding author:
| | - Muhammed Sedat Sakat
- Ataturk University, Faculty of Medicine, Department of Otorhinolaryngology – Erzurum, Turkey
| | - Abdulkadir Sahin
- Ataturk University, Faculty of Medicine, Department of Otorhinolaryngology – Erzurum, Turkey
| | - Serkan Yildirim
- Ataturk University, Faculty of Veterinary, Department of Pathology – Erzurum, Turkey
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Li J, Ding L. Effectiveness of Steroid Treatment for Sudden Sensorineural Hearing Loss: A Meta-analysis of Randomized Controlled Trials. Ann Pharmacother 2020; 54:949-957. [PMID: 32126823 DOI: 10.1177/1060028020908067] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Background: The best way to administer steroids for sudden sensorineural hearing loss (SSHL) is still unclear. The present study was aimed at estimating the efficacy of steroids by intratympanic, systemic, and combined therapy (CT) routes. Methods: A systematic literature search was performed from 1950 to October 2019 for randomized controlled trials comparing the use of intratympanic, systemic, and combined steroid therapy for SSHL. The outcomes of recovery rate and pure tone average (PTA) improvement were assessed by random-effects and fixed-effects meta-analysis. Results: A total of 20 articles identified from 7 countries were eligible for analysis. Although no significant difference in recovery rate was observed between intratympanic steroid therapy (IST) and systemic steroid therapy (SST), IST did demonstrate better hearing improvement, as evidenced by a higher PTA than SST. Compared with SST, CT comprising IST and SST had significant recovery rate improvement. Patients treated with CT had a significantly higher PTA than those treated with SST. Through subgroup analysis based on the equivalent dose of prednisone, it was shown that CT led to a significantly higher PTA than SST only in the high-dose CT versus high-dose SST groups and moderate-dose CT versus high-dose SST groups. Conclusion: Moderate and high dose of CT could accelerate hearing improvement in SSHL.
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Affiliation(s)
- Jinfei Li
- Beijing University of Chinese Medicine Subsidiary Dongfang Hospital, Beijing, China
| | - Lei Ding
- Beijing University of Chinese Medicine Subsidiary Dongfang Hospital, Beijing, China
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Kum NY, Yilmaz YF, Gurgen SG, Kum RO, Ozcan M, Unal A. Effects of parenteral papaverine and piracetam administration on cochlea following acoustic trauma. Noise Health 2019; 20:47-52. [PMID: 29676295 PMCID: PMC5926316 DOI: 10.4103/nah.nah_31_17] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
Introduction Noise exposure, the main cause of hearing loss in countries with lot of industries, may result both in temporary or permanent hearing loss. The goal of this study was to investigate the effects of parenteral papaverine and piracetam administration following an acoustic trauma on hearing function with histopathologic correlation. Materials and Methods Eighteen Wistar albino rats exposed to noise for 8 h in a free environment were included. We divided the study population into three groups, and performed daily intraperitoneal injections of papaverine, piracetam, and saline, respectively, throughout the study. We investigated the histopathologic effects of cellular apoptosis on inner hair cells (IHCs) and outer hair cells (OHCs) and compared the distortion product otoacoustic emissions (DPOAEs) thresholds among the groups. Results and Discussion On the 3rd and 7th days, DPOAE thresholds at 8 kHz were significantly higher both in papaverine and piracetam groups compared with the control group (P = 0.004 for 3rd day, P = 0.016 and P = 0.028 for 7th day, respectively). On the 14th day, piracetam group had significantly higher mean thresholds at 8 kHz (P = 0.029); however, papaverine group had similar mean thresholds compared to the control group (P = 0.200). On the 3rd and 7th days following acoustic trauma, both IHC and OHC loss were significantly lower in both papaverine and piracetam groups. On the 7th day, the mean amount of apoptotic IHCs and OHCs identified using Caspase-3 method were significantly lower in both groups, but the mean amount identified using terminal deoxynucleotidyl transferase dUTP nick end labeling method were similar in both groups compared to the control group. Conclusion We demonstrated the effects of papaverine and piracetam on the recovery of cochlear damage due to acoustic trauma on experimental animals using histopathologic and electrophysiologic examinations.
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Affiliation(s)
| | - Yavuz F Yilmaz
- Ankara Numune Education and Research Hospital ENT Clinic, Ankara, Turkey
| | - Seren G Gurgen
- Celal Bayar University School of Vocational Health Service, Department of Histology and Embryology, Manisa, Turkey
| | - Rauf O Kum
- Ankara Numune Education and Research Hospital ENT Clinic, Ankara, Turkey
| | - Muge Ozcan
- Ankara Numune Education and Research Hospital ENT Clinic, Ankara, Turkey
| | - Adnan Unal
- Ankara Numune Education and Research Hospital ENT Clinic, Ankara, Turkey
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Rybak LP, Dhukhwa A, Mukherjea D, Ramkumar V. Local Drug Delivery for Prevention of Hearing Loss. Front Cell Neurosci 2019; 13:300. [PMID: 31338024 PMCID: PMC6629775 DOI: 10.3389/fncel.2019.00300] [Citation(s) in RCA: 41] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2019] [Accepted: 06/19/2019] [Indexed: 12/20/2022] Open
Abstract
Systemic delivery of therapeutics for targeting the cochlea to prevent or treat hearing loss is challenging. Systemic drugs have to cross the blood-labyrinth barrier (BLB). BLB can significantly prevent effective penetration of drugs in appropriate concentrations to protect against hearing loss caused by inflammation, ototoxic drugs, or acoustic trauma. This obstacle may be obviated by local administration of protective agents. This route can deliver higher concentration of drug compared to systemic application and preclude systemic side effects. Protective agents have been administered by intra-tympanic injection in numerous preclinical studies. Drugs such as steroids, etanercept, D and L-methionine, pifithrin-alpha, adenosine agonists, melatonin, kenpaullone (a cyclin-dependent kinase 2 (CDK2) inhibitor) have been reported to show efficacy against cisplatin ototoxicity in animal models. Several siRNAs have been shown to ameliorate cisplatin ototoxicity when administered by intra-tympanic injection. The application of corticosteroids and a number of other drugs with adjuvants appears to enhance efficacy. Administration of siRNAs to knock down AMPK kinase, liver kinase B1 (LKB1) or G9a in the cochlea have been found to ameliorate noise-induced hearing loss. The local administration of these compounds appears to be effective in protecting the cochlea against damage from cisplatin or noise trauma. Furthermore the intra-tympanic route yields maximum protection in the basal turn of the cochlea which is most vulnerable to cisplatin ototoxicity and noise trauma. There appears to be very little transfer of these agents to the systemic circulation. This would avoid potential side effects including interference with anti-tumor efficacy of cisplatin. Nanotechnology offers strategies to effectively deliver protective agents to the cochlea. This review summarizes the pharmacology of local drug delivery by intra-tympanic injection to prevent hearing loss caused by cisplatin and noise exposure in animals. Future refinements in local protective agents provide exciting prospects for amelioration of hearing loss resulting from cisplatin or noise exposure.
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Affiliation(s)
- Leonard P Rybak
- Department of Otolaryngology, School of Medicine, Southern Illinois University, Springfield, IL, United States.,Department of Pharmacology, School of Medicine, Southern Illinois University, Springfield, IL, United States
| | - Asmita Dhukhwa
- Department of Pharmacology, School of Medicine, Southern Illinois University, Springfield, IL, United States
| | - Debashree Mukherjea
- Department of Otolaryngology, School of Medicine, Southern Illinois University, Springfield, IL, United States
| | - Vickram Ramkumar
- Department of Pharmacology, School of Medicine, Southern Illinois University, Springfield, IL, United States
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Tuhanioğlu B, Erkan SO, Gürgen SG, Özdaş T, Görgülü O, Çiçek F, Günay İ. The effect of very low dose pulsed magnetic waves on cochlea. Braz J Otorhinolaryngol 2019; 85:282-289. [PMID: 30583943 PMCID: PMC9442804 DOI: 10.1016/j.bjorl.2018.10.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2018] [Revised: 10/05/2018] [Accepted: 10/28/2018] [Indexed: 01/15/2023] Open
Affiliation(s)
- Birgül Tuhanioğlu
- Health Science University Adana City Hospital, Department of Otorhinolaryngology-Head and Neck Surgery, Adana, Turkey.
| | - Sanem Okşan Erkan
- Health Science University Adana City Hospital, Department of Otorhinolaryngology-Head and Neck Surgery, Adana, Turkey
| | - Seren Gülşen Gürgen
- Celal Bayar University, Department of Histology and Embriology, Manisa, Turkey
| | - Talih Özdaş
- Health Science University Adana City Hospital, Department of Otorhinolaryngology-Head and Neck Surgery, Adana, Turkey
| | - Orhan Görgülü
- Health Science University Adana City Hospital, Department of Otorhinolaryngology-Head and Neck Surgery, Adana, Turkey
| | - Figen Çiçek
- Çukurova University, Department of Biophysics, Adana, Turkey
| | - İsmail Günay
- Çukurova University, Department of Biophysics, Adana, Turkey
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Soyalıç H, Gevrek F, Karaman S. Curcumin protects against acoustic trauma in the rat cochlea. Int J Pediatr Otorhinolaryngol 2017; 99:100-106. [PMID: 28688549 DOI: 10.1016/j.ijporl.2017.05.029] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 05/30/2017] [Accepted: 05/31/2017] [Indexed: 12/28/2022]
Abstract
OBJECTIVES In this study we evaluated the therapeutic utility of curcumin in a rodent model of acoustic trauma using histopathology, immunohistochemical, and distortion product otoacoustic emission (DPOAEs) measurements. METHODS 28 Wistar albino rats were included in the study and randomly assigned to 4 treatment groups. The first group (group 1) served as the control and was exposed to acoustic trauma alone. Group 2 was the curcumin group. Group 3 was the curcumin plus acoustic trauma group. Group 4 was the saline plus acoustic trauma group. Otoacoustic emission measurements were collected at the end of the experiment and all animals were sacrificed. Cochlea were collected and prepared for TUNEL (TdT-mediated deoxyuridinetriphosphate nick end-labelling) staining assay. RESULTS Group 3 maintained baseline DPOAEs values at 3000 Hz, 4000 Hz and 8000 Hz on the 3rd and 5th day of the experiment. DPOAEs results were correlated with the immunohistochemical and histopathological findings in all groups. In comparison to the histopathologic control group, Group 1 exhibited a statistically significant increase in apoptotic indices in the organ of Corti, inner hair cell, and outer hair cell areas (p < 0.05). Relative to the control group, rats in Group 3 showed little increase in inner hair cell and outer hair cell apoptotic indices. CONCLUSIONS Our results support the conclusion that curcumin may protect the cochlear tissues from acoustic trauma in rats. Curcumin injection prior to or after an acoustic trauma reduces cochlear hair cell damage and may protect against hearing loss.
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Affiliation(s)
- Harun Soyalıç
- Ahi Evran University, Training and Research Hospital Department of Otorhinolaryngology, Kırşehir, Turkey.
| | - Fikret Gevrek
- Gaziosmanpaşa University, Department of Histology and Embryology, Tokat, Turkey
| | - Serhat Karaman
- Gaziosmanpaşa University, Department of Emergency Medicine, Tokat, Turkey
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Pharmacological agents used for treatment and prevention in noise-induced hearing loss. Eur Arch Otorhinolaryngol 2016; 273:4089-4101. [DOI: 10.1007/s00405-016-3936-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2015] [Accepted: 02/10/2016] [Indexed: 12/20/2022]
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Özel HE, Özdoğan F, Gülşen Gürgen S, Esen E, Selçuk A, Genç S. Effect of transtympanic betamethasone delivery to the inner ear. Eur Arch Otorhinolaryngol 2016; 273:3053-61. [PMID: 26831119 DOI: 10.1007/s00405-016-3905-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Accepted: 01/19/2016] [Indexed: 11/30/2022]
Abstract
To investigate the effect of transtympanic betamethasone administration on hearing function with histologic correlation, rats were divided into three transtympanic treatment groups: isotonic saline (group I, n = 10), gentamicin (group II, n = 10) and betamethasone (group III, n = 10). Distortion product otoacoustic emission thresholds were compared on day 10. Also histological effects on cellular apoptosis in both the inner and outer hair cells in organ of Corti and spiral ganglion neurons were evaluated. Distortion product otoacoustic emission thresholds were comparable (p > 0.05) between group I and group III in all measurements. Distortion product otoacoustic emission thresholds of group II were significantly elevated in all measurements when compared with group I (p < 0.05) and group III (p < 0.05). In the Terminal deoxynucleotidyl transferase dUTP Nick End Labelling (TUNEL), Caspase-3, Caspase-8 and Caspase-9 staining method the amount of apoptotic cells in group II were significantly elevated in all measurements compared with group I (p < 0.05). In the TUNEL staining method the amount of apoptotic cells in Group III were significantly elevated compared with group I in both the organ of Corti and spiral ganglion neurons (p < 0.05). The overall histological results revealed that the severity of cellular apoptosis caused by betamethasone was somewhere between isotonic saline and gentamicin. Transtympanic betamethasone does not affect inner ear function as measured by distortion product otoacoustic emission responses, but some increase in cellular apoptosis in the organ of Corti and spiral ganglion neurons was observed. These findings suggest that transtympanic betamethasone may have mild ototoxic effects. Further studies are needed to obtain precise results for transtympanic application of betamethasone.
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Affiliation(s)
- Halil Erdem Özel
- Department of Otolaryngology, Kocaeli Derince Research and Training Hospital, Kocaeli Derince Eğitim ve Araştırma Hastanesi Kulak Burun Boğaz Kliniği, 41900, Derince, Kocaeli, Turkey.
| | - Fatih Özdoğan
- Department of Otolaryngology, Kocaeli Derince Research and Training Hospital, Kocaeli Derince Eğitim ve Araştırma Hastanesi Kulak Burun Boğaz Kliniği, 41900, Derince, Kocaeli, Turkey
| | - Seren Gülşen Gürgen
- Department of Histology and Embryology, Celal Bayar University School of Vocational Health Service, Manisa, Turkey
| | - Erkan Esen
- Department of Otolaryngology, Kocaeli Derince Research and Training Hospital, Kocaeli Derince Eğitim ve Araştırma Hastanesi Kulak Burun Boğaz Kliniği, 41900, Derince, Kocaeli, Turkey
| | - Adin Selçuk
- Department of Otolaryngology, Kocaeli Derince Research and Training Hospital, Kocaeli Derince Eğitim ve Araştırma Hastanesi Kulak Burun Boğaz Kliniği, 41900, Derince, Kocaeli, Turkey
| | - Selahattin Genç
- Department of Otolaryngology, Kocaeli Derince Research and Training Hospital, Kocaeli Derince Eğitim ve Araştırma Hastanesi Kulak Burun Boğaz Kliniği, 41900, Derince, Kocaeli, Turkey
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Intratympanic Steroid Treatments May Improve Hearing via Ion Homeostasis Alterations and Not Immune Suppression. Otol Neurotol 2016; 36:1089-95. [PMID: 25692799 DOI: 10.1097/mao.0000000000000725] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
HYPOTHESIS The inner ear (IE) endothelium is capable of responding to therapeutic steroids by altering the local expression of cytokine and ion homeostasis genes that impact inflammation and fluid regulation. BACKGROUND Glucocorticoids are often given transtympanically for hearing disorders because of their anti-inflammatory effects, but their direct impact on IE ion homeostasis and cytokine gene expression has not been studied. METHODS The middle ears of Balb/c mice were transtympanically injected with 5 μL of phosphate-buffered saline, prednisolone (Pred), or dexamethasone (Dex). Untreated mice were used as controls. Mice were euthanized at 6, 24, and 72 hours; the cochleas were harvested; and total RNA was isolated from the IE tissues. Expression of eight cytokine genes and 24 ion homeostasis genes was analyzed with quantitative real time reverse transcription polymerase chain reaction. RESULTS Phosphate-buffered saline caused upregulation of inflammatory cytokine genes that peaked at 6 hours. Surprisingly, Pred and Dex also caused upregulation of most cytokine genes. Interestingly, ion homeostasis genes were predominantly upregulated with Dex and Pred, with Pred having a larger effect. CONCLUSION In the murine model, intratympanic steroids caused an initial upregulation of inflammatory cytokine genes in the IE, as well as predominant upregulation of ion homeostasis genes. These findings suggest that glucocorticoids do not suppress IE inflammation but rather cause an initial inflammatory response in the IE. Thus, inflammatory gene suppression is not a likely mechanism for their hearing restorative effects. On the other hand, these steroids have a significant mineralocorticoid function, as demonstrated by increased function of ion homeostasis genes, implicating their ionic and fluid regulatory properties as a mechanism for their therapeutic effects.
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Chen J, Zhao Y, Zhou X, Tan L, Ou Z, Yu Y, Wang Y. Methylprednisolone use during radiotherapy extenuates hearing loss in patients with nasopharyngeal carcinoma. Laryngoscope 2015; 126:100-3. [PMID: 26309227 DOI: 10.1002/lary.25527] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/30/2015] [Indexed: 11/08/2022]
Abstract
OBJECTIVES/HYPOTHESIS To investigate the hearing protective effects of methylprednisolone use during radiotherapy in patients with nasopharyngeal carcinoma. STUDY DESIGN Prospective, controlled clinical study. METHODS Fifty-three patients with nasopharyngeal carcinoma (106 ears). Twenty-five patients (50 ears) received radiotherapy with intravenous methylprednisolone for 14 days, and another 28 patients (56 ears) received radiotherapy alone. Pure tone audiometry, distortion product otoacoustic emission (DPOAE), and auditory brainstem responses (ABR) results were reviewed before and 1 year after radiotherapy. RESULT One year after radiotherapy, the air-and-bone conduction pure tone hearing thresholds increased, and the DPOAE levels decreased in the control group. There was no difference in the ABR wave I, III, and V latencies and the I to V interwave latencies before and 1 year after radiotherapy. The pure tone air conduction thresholds decreased, and the DPOAE levels increased in the treatment group compared with the control group. CONCLUSION Early sensorineural hearing loss after radiotherapy primarily affected the outer hair cells. The use of methylprednisolone during radiotherapy can extenuate early sensorineural hearing loss caused by irradiation.
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Affiliation(s)
- Junming Chen
- Department of Otolaryngology, The First People's Hospital of Foshan, Foshan, People's Republic of China
| | - Yuanxin Zhao
- Department of Otolaryngology, The First People's Hospital of Foshan, Foshan, People's Republic of China
| | | | - Lingmei Tan
- Department of Otolaryngology, The First People's Hospital of Foshan, Foshan, People's Republic of China
| | - Zeying Ou
- Department of Otolaryngology, The First People's Hospital of Foshan, Foshan, People's Republic of China
| | - Youjun Yu
- Department of Otolaryngology, The First People's Hospital of Foshan, Foshan, People's Republic of China
| | - Yuejian Wang
- Department of Otolaryngology, The First People's Hospital of Foshan, Foshan, People's Republic of China
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Chen L, Dean C, Gandolfi M, Nahm E, Mattiace L, Kim AH. Dexamethasone's effect in the retrocochlear auditory centers of a noise-induced hearing loss mouse model. Otolaryngol Head Neck Surg 2014; 151:667-74. [PMID: 25113508 DOI: 10.1177/0194599814545771] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
OBJECTIVE Examine prophylactic effects of dexamethasone (Dex) in retrocochlear auditory centers in a noise-induced hearing loss (NIHL) mouse model. STUDY DESIGN Prospective animal study. SETTING Academic research center. SUBJECTS AND METHODS Thirty-two mice were divided into control, untreated, saline (2 and 10 µL), and Dex (2 and 10 µL) groups. Dex was applied intratympanically (IT) prior to 110 to 120 dB noise over 6 hours. Auditory brainstem response (ABR) and distortion product otoacoustic emission (DPOAE) were performed at 1 day, 1 week, 1 month, and 2 months. Retrocochlear neuronal cells were labeled with FluoroGold and counted. Hair cells of the organ of Corti were labeled with fluorescein isothiocyanate-conjugated phalloidin and counted. RESULTS Auditory brainstem response thresholds of untreated NIHL, 2 and 10 µL IT saline, and 2 and 10 µL IT Dex were 21.7 ± 2.9 dB, 20 ± 0 dB, 20 ± 5 dB, 18.3 ± 2.9 dB, and 18.3 ± 2.9 dB, respectively. At 1-day post NIHL, all groups demonstrated profound hearing loss. At 2 weeks, 2 and 10 µL Dex thresholds improved to 47.5 ± 3.5 dB and 48.8 ± 18.9 dB, respectively, whereas the untreated and saline groups remained unchanged. Mean cell counts in the cochlear nucleus (CN), superior olivary complex (SOC), and lateral lemniscus (LL) of control mice were 1483 ± 190, 2807 ± 67, and 112 ± 20, respectively. After acoustic trauma, the untreated, saline, and 2 µL Dex groups yielded decreased neuronal counts in the SOC. In contrast, the 10 µL Dex group had 1883 ± 186 (CN), 2774 ± 182 (SOC), and 166 ± 18 (LL). There was sporadic hair cell loss for all traumatized groups. CONCLUSION Our NIHL mouse model demonstrated dose-dependent Dex pretreatment otoprotection against NIHL with preservation of retrocochlear auditory neurons.
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Affiliation(s)
- Leon Chen
- Department of Otolaryngology-Head and Neck Surgery, New York Eye and Ear Infirmary, New York, New York, USA
| | - Clare Dean
- Department of Otolaryngology-Head and Neck Surgery, New York Eye and Ear Infirmary, New York, New York, USA
| | - Michele Gandolfi
- Department of Otolaryngology-Head and Neck Surgery, New York Eye and Ear Infirmary, New York, New York, USA
| | - Edmund Nahm
- Department of Otolaryngology-Head and Neck Surgery, New York Eye and Ear Infirmary, New York, New York, USA
| | - Linda Mattiace
- Department of Cell Biology and Anatomy, New York Medical College, Valhalla, New York, USA
| | - Ana H Kim
- Department of Otolaryngology-Head and Neck Surgery, New York Eye and Ear Infirmary, New York, New York, USA Department of Cell Biology and Anatomy, New York Medical College, Valhalla, New York, USA
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