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Jaudoin C, Carré F, Gehrke M, Sogaldi A, Steinmetz V, Hue N, Cailleau C, Tourrel G, Nguyen Y, Ferrary E, Agnely F, Bochot A. Transtympanic injection of a liposomal gel loaded with N-acetyl-L-cysteine: A relevant strategy to prevent damage induced by cochlear implantation in guinea pigs? Int J Pharm 2021; 604:120757. [PMID: 34058306 DOI: 10.1016/j.ijpharm.2021.120757] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2021] [Revised: 05/26/2021] [Accepted: 05/27/2021] [Indexed: 01/17/2023]
Abstract
Patients with residual hearing can benefit from cochlear implantation. However, insertion can damage cochlear structures and generate oxidative stress harmful to auditory cells. The antioxidant N-acetyl-L-cysteine (NAC) is a precursor of glutathione (GSH), a powerful endogenous antioxidant. NAC local delivery to the inner ear appeared promising to prevent damage after cochlear implantation in animals. NAC-loaded liposomal gel was specifically designed for transtympanic injection, performed both 3 days before and on the day of surgery. Hearing thresholds were recorded over 30 days in implanted guinea pigs with and without NAC. NAC, GSH, and their degradation products, N,N'-diacetyl-L-cystine (DiNAC) and oxidized glutathione (GSSG) were simultaneously quantified in the perilymph over 15 days in non-implanted guinea pigs. For the first time, endogenous concentrations of GSH and GSSG were determined in the perilymph. Although NAC-loaded liposomal gel sustained NAC release in the perilymph over 15 days, it induced hearing loss in both implanted and non-implanted groups with no perilymphatic GSH increase. Under physiological conditions, NAC appeared poorly stable within liposomes. As DiNAC was quantified at concentrations which were twice as high as NAC in the perilymph, it was hypothesized that DiNAC could be responsible for the adverse effects on hearing.
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Affiliation(s)
- Céline Jaudoin
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 5 rue J-B Clément, 92296 Châtenay-Malabry, France.
| | - Fabienne Carré
- Inserm/Institut Pasteur, Institut de l'audition, Technologies et thérapie génique pour la surdité, 63 rue de Charenton, 75012 Paris, France.
| | - Maria Gehrke
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 5 rue J-B Clément, 92296 Châtenay-Malabry, France.
| | - Audrey Sogaldi
- UMS IPSIT, SAMM, Faculté de Pharmacie, Université Paris-Saclay, 5 rue J-B Clément, 92296 Châtenay-Malabry, France.
| | - Vincent Steinmetz
- Université Paris-Saclay, CNRS, Institut de Chimie des Substances Naturelles, UPR 2301, 91198 Gif-sur-Yvette, France.
| | - Nathalie Hue
- Université Paris-Saclay, CNRS, Institut de Chimie des Substances Naturelles, UPR 2301, 91198 Gif-sur-Yvette, France.
| | - Catherine Cailleau
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 5 rue J-B Clément, 92296 Châtenay-Malabry, France.
| | - Guillaume Tourrel
- Oticon Medical/Neurelec SAS, Research & Technology Department, 2720 chemin Saint-Bernard, Vallauris, France.
| | - Yann Nguyen
- Inserm/Institut Pasteur, Institut de l'audition, Technologies et thérapie génique pour la surdité, 63 rue de Charenton, 75012 Paris, France; Sorbonne Université, AP-HP, GHU Pitié-Salpêtrière, DMU ChIR, Service ORL, GRC Robotique et Innovation Chirurgicale, 47-83, boulevard de l'hôpital, 75013 Paris, France.
| | - Evelyne Ferrary
- Inserm/Institut Pasteur, Institut de l'audition, Technologies et thérapie génique pour la surdité, 63 rue de Charenton, 75012 Paris, France.
| | - Florence Agnely
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 5 rue J-B Clément, 92296 Châtenay-Malabry, France.
| | - Amélie Bochot
- Université Paris-Saclay, CNRS, Institut Galien Paris-Saclay, 5 rue J-B Clément, 92296 Châtenay-Malabry, France.
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Chen T, Luo Y, Li Q, Yang C, Yuan Y, Peng J, Ban M, Liang Y, Zhang W. Melatonin reduces radiation damage in inner ear. JOURNAL OF RADIATION RESEARCH 2021; 62:217-225. [PMID: 33454767 PMCID: PMC7948882 DOI: 10.1093/jrr/rraa137] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/02/2020] [Revised: 11/25/2020] [Indexed: 06/12/2023]
Abstract
The purpose of this study was to use a murine model to determine if melatonin can protect the inner ear from radiation-induced damage. A total of 81 4-week-old Balb/c mice were randomly divided into five groups: control group; 50 mg/kg melatonin group; 5 mg/kg melatonin+radiotherapy group; 50 mg/kg melatonin+radiotherapy group; radiotherapy group. The radiotherapy groups received 16 Gy irradiation and melatonin was administered by intraperitoneal injection 30 min before radiotherapy. On days 3 and 7 after irradiation the function of outer hair cells was determined by auditory brainstem response (ABR) and distortion product otoacoustic emissions (DPOAEs) testing, pathological changes of inner ear cells were observed by light microscopy, and the expression of prestin mRNA was determined. ABR thresholds were increased and wave I latencies were extended after radiotherapy; however, the increases were lower in the groups that received melatonin (P < 0.05). DPOAEs showed radiotherapy-induced hearing loss at 8-12 kHz, and hearing loss was greater on day 7 than day 3. However, hearing loss was less in the melatonin groups (P < 0.05). Histopathological examination showed irradiation resulted in breaks and distortion of the cochlear basement membrane, disruption of the stria vascularis, and swelling of outer hair cells. Melatonin reduced these changes. Radiotherapy upregulated prestin mRNA expression. Radiotherapy-induced upregulation of prestin was decreased in the melatonin groups (P < 0.05), and the decrease was greater in the 50 mg/kg melatonin group (P < 0.05). Melatonin protects against radiation-induced cochlear damage by reducing damage to outer hair cells.
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MESH Headings
- Animals
- Auditory Threshold/drug effects
- Auditory Threshold/radiation effects
- Ear, Inner/pathology
- Ear, Inner/physiopathology
- Ear, Inner/radiation effects
- Evoked Potentials, Auditory, Brain Stem/drug effects
- Gene Expression Regulation/drug effects
- Gene Expression Regulation/radiation effects
- Melatonin/pharmacology
- Melatonin/therapeutic use
- Mice, Inbred BALB C
- Molecular Motor Proteins/genetics
- Molecular Motor Proteins/metabolism
- Otoacoustic Emissions, Spontaneous/drug effects
- Otoacoustic Emissions, Spontaneous/radiation effects
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Radiation Injuries/drug therapy
- Radiation Injuries/genetics
- Radiation Injuries/physiopathology
- Signal-To-Noise Ratio
- Mice
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Affiliation(s)
- Ting Chen
- Department of Otolaryngology, GuangDong Women and Children Hospital, Guangzhou, Guangdong, China
| | - Yuling Luo
- Department of Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Qi Li
- Department of Otorhinolaryngology-Head and Neck Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Chen Yang
- Department of Otolaryngology Head and Neck Surgery, Beijing Friendship Hospital, Capital Medical University, Beijing, China
| | - Yixin Yuan
- Department of Otorhinolaryngology-Head and Neck Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Jinhao Peng
- Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Molu Ban
- Department of Otorhinolaryngology-Head and Neck Surgery, the People's Hospital of Guangxi Zhuang Autonomous Region, Nanning, Guangxi, China
| | - Yong Liang
- Department of Otorhinolaryngology-Head and Neck Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
| | - Wei Zhang
- Department of Otorhinolaryngology-Head and Neck Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong, China
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Azzam P, Mroueh M, Francis M, Daher AA, Zeidan YH. Radiation-induced neuropathies in head and neck cancer: prevention and treatment modalities. Ecancermedicalscience 2020; 14:1133. [PMID: 33281925 PMCID: PMC7685771 DOI: 10.3332/ecancer.2020.1133] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2020] [Indexed: 12/24/2022] Open
Abstract
Head and neck cancer (HNC) is the sixth most common human malignancy with a global incidence of 650,000 cases per year. Radiotherapy (RT) is commonly used as an effective therapy to treat tumours as a definitive or adjuvant treatment. Despite the substantial advances in RT contouring and dosage delivery, patients suffer from various radiation-induced complications, among which are toxicities to the nervous tissues in the head and neck area. Radiation-mediated neuropathies manifest as a result of increased oxidative stress-mediated apoptosis, neuroinflammation and altered cellular function in the nervous tissues. Eventually, molecular damage results in the formation of fibrotic tissues leading to susceptible loss of function of numerous neuronal substructures. Neuropathic sequelae following irradiation in the head and neck area include sensorineural hearing loss, alterations in taste and smell functions along with brachial plexopathy, and cranial nerves palsies. Numerous management options are available to relieve radiation-associated neurotoxicities notwithstanding treatment alternatives that remain restricted with limited benefits. In the scope of this review, we discuss the use of variable management and therapeutic modalities to palliate common radiation-induced neuropathies in head and neck cancers.
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Affiliation(s)
- Patrick Azzam
- Department of Anatomy, Cell Biology and Physiology, Faculty of Medicine, American University of Beirut, Beirut 1107 2020, Lebanon
| | - Manal Mroueh
- Department of Anatomy, Cell Biology and Physiology, Faculty of Medicine, American University of Beirut, Beirut 1107 2020, Lebanon
| | - Marina Francis
- Department of Anatomy, Cell Biology and Physiology, Faculty of Medicine, American University of Beirut, Beirut 1107 2020, Lebanon
| | - Alaa Abou Daher
- Department of Anatomy, Cell Biology and Physiology, Faculty of Medicine, American University of Beirut, Beirut 1107 2020, Lebanon
| | - Youssef H Zeidan
- Department of Anatomy, Cell Biology and Physiology, Faculty of Medicine, American University of Beirut, Beirut 1107 2020, Lebanon
- Department of Radiation Oncology, American University of Beirut Medical Center, Beirut 1107 2020, Lebanon
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Low WK, Teng SW, Tan MGK. Synergistic Ototoxicity of Gentamicin and Low-Dose Irradiation: Molecular Basis and Clinical Significance. Audiol Neurootol 2019; 25:111-119. [PMID: 31838466 DOI: 10.1159/000503133] [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: 01/29/2019] [Accepted: 09/03/2019] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND Inner ear structures may be included in the radiation fields when irradiation is used to treat patients with head and neck cancers. These patients may also have concurrent infections that require gentamicin treatment. Radiation and gentamicin are both potentially ototoxic, and their combined use has been shown to result in synergistic ototoxicity in animals. OBJECTIVE We aimed to confirm the synergistic ototoxicity of combined gentamicin and low-dose irradiation treatment and identify the underlying molecular mechanisms using an in vitro model. METHOD We compared the ototoxic effects of gentamicin, low-dose irradiation, and their combination in the OC-k3 mouse cochlear cell line using cell viability assay, live/dead stain, apoptosis detection assay, oxidative stress detection, and studied the molecular mechanisms involved using immunoblot analysis. RESULTS Combined treatment led to prolonged oxidative stress, reduced cell viability, and synergistic apoptosis. Gentamicin induced the concurrent accumulation of LC3b-II and SQSTM1/p62, suggesting an impairment of autophagic flux. Low-dose irradiation induced transient p53 phosphorylation and persistent Akt phosphorylation in response to DNA damage. In combined treatment, gentamicin attenuated irradiation-induced Akt activation. CONCLUSIONS Besides increased oxidative stress, synergistic apoptosis observed in combined treatment could be attributed to gentamicin-induced perturbation of autophagic flux and attenuation of Akt phosphorylation, which led to an impairment of radiation-induced DNA repair response.
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Affiliation(s)
- Wong Kein Low
- Department of Otolaryngology, Singapore General Hospital, Singapore, Singapore, .,Duke-NUS Graduate Medical School, Singapore, Singapore, .,Novena Ent-Head and Neck Surgery Specialist Centre, Mount Elizabeth Novena Medical Centre, Singapore, Singapore,
| | - Siaw Wei Teng
- Department of Otolaryngology, Singapore General Hospital, Singapore, Singapore
| | - Michelle G K Tan
- Departments of Clinical Translational Research, Singapore General Hospital, Singapore, Singapore
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Lower ototoxicity and absence of hidden hearing loss point to gentamicin C1a and apramycin as promising antibiotics for clinical use. Sci Rep 2019; 9:2410. [PMID: 30787404 PMCID: PMC6382871 DOI: 10.1038/s41598-019-38634-3] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Accepted: 11/29/2018] [Indexed: 11/08/2022] Open
Abstract
Spread of antimicrobial resistance and shortage of novel antibiotics have led to an urgent need for new antibacterials. Although aminoglycoside antibiotics (AGs) are very potent anti-infectives, their use is largely restricted due to serious side-effects, mainly nephrotoxicity and ototoxicity. We evaluated the ototoxicity of various AGs selected from a larger set of AGs on the basis of their strong antibacterial activities against multidrug-resistant clinical isolates of the ESKAPE panel: gentamicin, gentamicin C1a, apramycin, paromomycin and neomycin. Following local round window application, dose-dependent effects of AGs on outer hair cell survival and compound action potentials showed gentamicin C1a and apramycin as the least toxic. Strikingly, although no changes were observed in compound action potential thresholds and outer hair cell survival following treatment with low concentrations of neomycin, gentamicin and paromomycin, the number of inner hair cell synaptic ribbons and the compound action potential amplitudes were reduced. This indication of hidden hearing loss was not observed with gentamicin C1a or apramycin at such concentrations. These findings identify the inner hair cells as the most vulnerable element to AG treatment, indicating that gentamicin C1a and apramycin are promising bases for the development of clinically useful antibiotics.
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Düzenli U, Altun Z, Olgun Y, Aktaş S, Pamukoğlu A, Çetinayak HO, Bayrak AF, Olgun L. Role of N-acetyl cysteine and acetyl-l-carnitine combination treatment on DNA-damage-related genes induced by radiation in HEI-OC1 cells. Int J Radiat Biol 2019; 95:298-306. [PMID: 30496017 DOI: 10.1080/09553002.2019.1547847] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
PURPOSE The aim of the present study was to evaluate the effect of acetyl-l-carnitine (ALC) and N-acetyl cysteine (NAC) on ionizing radiation (IR)-induced cytotoxicity and change in DNA damage-related genes in House Ear Institute-Organ of Corti 1 (HEI-OC1) cells. METHODS HEI-OC1 cells were irradiated with 5 Gy radiation and treated by eight combinations of NAC and/or ALC: control, NAC, ALC, IR, NAC + IR, ALC + NAC, ALC + IR, and ALC + NAC + IR. Cell viability, apoptotic cell death, and DNA damage were measured at the 72nd hour. Eighty-four IR-induced DNA-damage-related genes were determined by RT-PCR gene array and >10-fold changes were considered significant. RESULTS IR decreased cell viability by about 50% at 72 hours of incubation. In particular, the ALC and/or NAC combination before IR protected the HEI-OC1 cells (p < .05). Single and combination treatment prior to IR led to lower apoptotic cell death (p < .05). There was a significant lower DNA damage in ALC + NAC + IR group compared to IR group (p < .05). Expressions of Brca2, Xpc, Mlh3, Rad51, Xrcc2, Hus1, Rad9a, Cdkn1a, Gadd45a which are the DNA-repair genes were found to be significantly higher in NAC + ALC + IR group than those in individual treatment of ALC or NAC. CONCLUSIONS ALC and/or NAC treatment prior to IR led to higher cell viability and lower apoptotic cell damage compared to the IR group. The results of the study show that the ALC + NAC combination treatment inhibits DNA damage and induces DNA-repair genes to repair radiation damage, and this combination treatment is more effective against radiation-induced DNA damage than NAC or ALC therapy individually.
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Affiliation(s)
- Ufuk Düzenli
- a Department of Otorhinolaryngology , Bozyaka Teaching and Research Hospital , Izmir , Turkey
| | - Zekiye Altun
- b Department of Basic Oncology , Dokuz Eylül University Institute of Oncology , Izmir , Turkey
| | - Yüksel Olgun
- c Department of Otorhinolaryngology, School of Medicine , Dokuz Eylül University , Izmir , Turkey
| | - Safiye Aktaş
- b Department of Basic Oncology , Dokuz Eylül University Institute of Oncology , Izmir , Turkey
| | - Ayça Pamukoğlu
- b Department of Basic Oncology , Dokuz Eylül University Institute of Oncology , Izmir , Turkey
| | - Hasan Oğuz Çetinayak
- d Department of Radiation Oncology, Faculty of Medicine , Dokuz Eylül University , Izmir , Turkey
| | - Asuman Feda Bayrak
- a Department of Otorhinolaryngology , Bozyaka Teaching and Research Hospital , Izmir , Turkey
| | - Levent Olgun
- a Department of Otorhinolaryngology , Bozyaka Teaching and Research Hospital , Izmir , Turkey
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Somdaş MA, Güntürk İ, Balcıoğlu E, Avcı D, Yazıcı C, Özdamar S. Protective effect of N-acetylcysteine against cisplatin ototoxicity in rats: a study with hearing tests and scanning electron microscopy. Braz J Otorhinolaryngol 2018; 86:30-37. [PMID: 30268784 PMCID: PMC9422681 DOI: 10.1016/j.bjorl.2018.08.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2018] [Revised: 07/17/2018] [Accepted: 08/14/2018] [Indexed: 10/28/2022] Open
Abstract
INTRODUCTION Ototoxicity is a health problem appearing after powerful treatments in serious health conditions. It is sometimes inevitable when treatment of the serious disease is required. Cisplatin is an antineoplastic agent which was investigated previously to reveal increased nitrogen and reactive oxygen radicals that damages hair cells, resulting in ototoxicity. N-acetylcysteine, previously shown to decrease ototoxicity caused by different agents, is known to be a powerful in vitro antioxidant. Probably N-acetylcysteine, in addition to its antioxidant effect, blocks a cascade where reactive oxygen species result in apoptosis in the cochlea. OBJECTIVES The possible preventive effect of N-acetylcysteine in cisplatin ototoxicity was studied with auditory brain stem responses, otoacoustic emissions, and histopathological investigation of the cochlea in a scanning electron microscopy. METHODS This study was conducted on 21 Wistar Albino rats in four groups. 1mL/kg/day three times in total intraperitoneal (i.p.) Saline (n=5), 500mg/kg/day i.p. three times in total N-acetylcysteine (n=5), i.p. 15mg/kg cisplatin alone (single dose) (n=5) and i.p. 15mg/kg cisplatin plus 500mg/kg/day N-acetylcysteine (n=6) were administered. The rats were anesthetized to study the hearing tests before and after the experiment. The rats were sacrificed to investigate the cochleas by scanning electron microscopy. RESULTS Auditory brain stem responses and otoacoustic emissions values were attenuated in the cisplatin group. The group that received N-acetylcysteine in addition to cisplatin had better auditory brain stem responses thresholds and otoacoustic emissions. The samples obtained from the cisplatin group showed surface irregularities, degeneration areas, and total or partial severe stereocilia losses. The changes were milder in the cisplatin+N-acetylcysteine group. CONCLUSION Cisplatin ototoxicity can be detected by auditory brain stem responses and otoacoustic emissions testing in rats. N-acetylcysteine may protect the cochlear cells from histopathological changes. We concluded that N-acetylcysteine given 4h after cisplatin injection has a potential otoprotective effect against cisplatin ototoxicity. which suggests it could be used in clinical trials.
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Affiliation(s)
- Mehmet Akif Somdaş
- Erciyes University, Faculty of Medicine, Department of Otorhinolaryngology, Kayseri, Turkey.
| | - İnayet Güntürk
- Erciyes University, School of Medicine, Department of Medical Biochemistry, Kayseri, Turkey
| | - Esra Balcıoğlu
- Erciyes University, School of Medicine, Department of Histology and Embryology, Kayseri, Turkey
| | - Deniz Avcı
- Patnos State Hospital, Department of Otorhinolaryngology, Ağrı, Turkey
| | - Cevat Yazıcı
- Erciyes University, School of Medicine, Department of Medical Biochemistry, Kayseri, Turkey
| | - Saim Özdamar
- Erciyes University, School of Medicine, Department of Histology and Embryology, Kayseri, Turkey
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Maria OM, Eliopoulos N, Muanza T. Radiation-Induced Oral Mucositis. Front Oncol 2017; 7:89. [PMID: 28589080 PMCID: PMC5439125 DOI: 10.3389/fonc.2017.00089] [Citation(s) in RCA: 205] [Impact Index Per Article: 29.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2016] [Accepted: 04/21/2017] [Indexed: 01/11/2023] Open
Abstract
Radiation-induced oral mucositis (RIOM) is a major dose-limiting toxicity in head and neck cancer patients. It is a normal tissue injury caused by radiation/radiotherapy (RT), which has marked adverse effects on patient quality of life and cancer therapy continuity. It is a challenge for radiation oncologists since it leads to cancer therapy interruption, poor local tumor control, and changes in dose fractionation. RIOM occurs in 100% of altered fractionation radiotherapy head and neck cancer patients. In the United Sates, its economic cost was estimated to reach 17,000.00 USD per patient with head and neck cancers. This review will discuss RIOM definition, epidemiology, impact and side effects, pathogenesis, scoring scales, diagnosis, differential diagnosis, prevention, and treatment.
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Affiliation(s)
- Osama Muhammad Maria
- Faculty of Medicine, Experimental Medicine Department, McGill University, Montreal, QC, Canada
- Radiation Oncology Department, Jewish General Hospital, McGill University, Montreal, QC, Canada
- Lady Davis Institute for Medical Research, Jewish General Hospital, McGill University, Montreal, QC, Canada
| | - Nicoletta Eliopoulos
- Lady Davis Institute for Medical Research, Jewish General Hospital, McGill University, Montreal, QC, Canada
- Faculty of Medicine, Surgery Department, McGill University, Montreal, QC, Canada
| | - Thierry Muanza
- Faculty of Medicine, Experimental Medicine Department, McGill University, Montreal, QC, Canada
- Radiation Oncology Department, Jewish General Hospital, McGill University, Montreal, QC, Canada
- Lady Davis Institute for Medical Research, Jewish General Hospital, McGill University, Montreal, QC, Canada
- Oncology Department, McGill University, Montreal, QC, Canada
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Effects of Intratympanic Dexamethasone on High-Dose Radiation Ototoxicity In Vivo. Otol Neurotol 2017; 38:180-186. [DOI: 10.1097/mao.0000000000001289] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Abstract
HYPOTHESIS Dexamethasone (DXM) protects against radiation-induced loss of auditory hair cells (HCs) in rat organ of Corti (OC) explants by reducing levels of oxidative stress and apoptosis. BACKGROUND Radiation-induced sensorineural hearing loss (HL) is progressive, dose-dependent, and irreversible. Currently, there are no preventative therapeutic modalities for radiation-induced HL. DXM is a synthetic steroid that can potentially target many of the pathways involved in radiation-induced ototoxicity. METHODS Whole OC explants were dissected from 3-day-old rat cochleae exposed to specific dosages of single-fraction radiation (0, 2, 5, 10, or 20 Gy), were either untreated or treated with DXM (75, 150, 300 μg/mL), and then cultured for 48 or 96 hours. Confocal microscopy for oxidative stress (CellRox, 48 h) and apoptosis (TUNEL assay, 96 h) and fluorescent microscopy for viable HC counts (fluorescein isothiocyanate-phalloidin, 96 h) were performed. Analysis of variance and Tukey post hoc testing were used for statistical analysis. RESULTS Radiation exposure initiated dose-dependent losses of inner and outer HCs, predominantly in the basal turns of the OC explants. DXM protected against radiation-induced HC losses in a dose-dependent manner. DXM significantly reduced levels of oxidative stress and apoptosis in radiation-injured OC explants (p < 0.001). CONCLUSIONS Radiation-initiated HC losses were dose-dependent in OC explants. DXM treatment protected explant HCs against radiation-initiated losses by decreasing the levels of oxidative stress and apoptosis. DXM may potentially be a therapeutic modality for preventing radiation-induced HL; further in vivo studies are necessary.
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Giese APJ, Guarnaschelli JG, Ward JA, Choo DI, Riazuddin S, Ahmed ZM. Radioprotective Effect of Aminothiol PrC-210 on Irradiated Inner Ear of Guinea Pig. PLoS One 2015; 10:e0143606. [PMID: 26599238 PMCID: PMC4657906 DOI: 10.1371/journal.pone.0143606] [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: 07/27/2015] [Accepted: 11/06/2015] [Indexed: 11/19/2022] Open
Abstract
Radiotherapy of individuals suffering with head & neck or brain tumors subserve the risk of sensorineural hearing loss. Here, we evaluated the protective effect of Aminothiol PrC-210 (3-(methyl-amino)-2-((methylamino)methyl)propane-1-thiol) on the irradiated inner ear of guinea pigs. An intra-peritoneal or intra-tympanic dose of PrC-210 was administered prior to receiving a dose of gamma radiation (3000 cGy) to each ear. Auditory Brainstem Responses (ABRs) were recorded one week and two weeks after the radiation and compared with the sham animal group. ABR thresholds of guinea pigs that received an intra-peritoneal dose of PrC-210 were significantly better compared to the non-treated, control animals at one week post-radiation. Morphologic analysis of the inner ear revealed significant inflammation and degeneration of the spiral ganglion in the irradiated animals not treated with PrC-210. In contrast, when treated with PrC-210 the radiation effect and injury to the spiral ganglion was significantly alleviated. PrC-210 had no apparent cytotoxic effect in vivo and did not affect the morphology or count of cochlear hair cells. These findings suggest that aminothiol PrC-210 attenuated radiation-induced cochlea damage for at least one week and protected hearing.
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MESH Headings
- Animals
- Audiometry, Pure-Tone
- Cochlea/drug effects
- Cochlea/radiation effects
- Diamines/pharmacology
- Dose-Response Relationship, Radiation
- Ear, Inner/drug effects
- Ear, Inner/radiation effects
- Evoked Potentials, Auditory, Brain Stem
- Guinea Pigs
- Hair Cells, Auditory/drug effects
- Hair Cells, Auditory/radiation effects
- Hearing
- Hearing Loss, Sensorineural/etiology
- Hearing Loss, Sensorineural/prevention & control
- Injections, Intraperitoneal
- Radiation-Protective Agents/pharmacology
- Radiotherapy/adverse effects
- Spiral Ganglion/drug effects
- Spiral Ganglion/radiation effects
- Sulfhydryl Compounds/chemistry
- Sulfhydryl Compounds/pharmacology
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Affiliation(s)
- Arnaud P. J. Giese
- Department of Otorhinolaryngology Head & Neck Surgery, School of Medicine, University of Maryland, Baltimore, Maryland, United States of America
| | - Jess G. Guarnaschelli
- Department of Radiation Oncology, University of Cincinnati, Ohio, United States of America
- Department of Radiation Oncology, TriHealth Cancer Institute, Cincinnati, Ohio, United States of America
- * E-mail: (JGG); (ZMA)
| | - Jonette A. Ward
- Division of Pediatric Otolaryngology Head & Neck Surgery, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, United States of America
| | - Daniel I. Choo
- Division of Pediatric Otolaryngology Head & Neck Surgery, Cincinnati Children’s Hospital Medical Center, Cincinnati, Ohio, United States of America
| | - Saima Riazuddin
- Department of Otorhinolaryngology Head & Neck Surgery, School of Medicine, University of Maryland, Baltimore, Maryland, United States of America
| | - Zubair M. Ahmed
- Department of Otorhinolaryngology Head & Neck Surgery, School of Medicine, University of Maryland, Baltimore, Maryland, United States of America
- * E-mail: (JGG); (ZMA)
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Ciftci Z, Deniz M, Yilmaz I, Ciftci HG, Sirin DY, Gultekin E. In vitro analysis of a novel controlled release system designed for intratympanic administration of N-acetylcysteine: a preliminary report. Am J Otolaryngol 2015; 36:786-93. [PMID: 26545472 DOI: 10.1016/j.amjoto.2015.08.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Revised: 08/05/2015] [Accepted: 08/09/2015] [Indexed: 11/30/2022]
Abstract
The aim of this in-vitro experimental study was to design a novel drug delivery system that may permit controlled release of N-acetylcysteine (NAC) following intratympanic administration. The system was composed of two different solutions that attained a hydrogel form within seconds after getting into contact with each other. The authors performed swelling, pH and temperature tests and analysis of controlled release of NAC from this novel controlled release system. For the structure and porosity analysis of the hydrogel, an environmental scanning electron microscope (SEM) was used. The diameter of designed hydrogel showed an increase when pH was increased. In addition, in comparison to acidic values, the pore diameter of the hydrogel increased significantly especially in physiological level. The increase in the pore diameter was also directly proportional to the increase in temperature. Spectrophotometric analysis showed that the amount of NAC released into the medium was statistically significant (p=0.038, t=-2.18, 95% CI; DF: 27). SEM analysis of the samples revealed a smooth surface topography and numerous porous structures. The authors are of the opinion that the designed hydrogel may be used as an alternative method for intratympanic delivery of NAC for otoprotective purposes. The disadvantages of intratympanic injection of the drug in its liquid form, including leakage through eustachian tube, restraining the patient in an uncomfortable position, necessity for repetitive injections and dose dependent inflammation of the middle ear epithelium, may also be avoided. Further in vivo studies should be conducted to assess its tolerability and effectivity.
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Affiliation(s)
- Zafer Ciftci
- Department of Otorhinolaryngology, School of Medicine, Namik Kemal University, Turkey.
| | - Mahmut Deniz
- Department of Otorhinolaryngology, School of Medicine, Namik Kemal University, Turkey
| | - Ibrahim Yilmaz
- Department of Pharmacovigilance and Rational Use of Drugs, Tekirdag State Hospital, Ministry of Health, Turkey
| | - Halide Gunes Ciftci
- Department of Otorhinolaryngology, Tekirdag State Hospital, Ministry of Health, Turkey
| | - Duygu Yasar Sirin
- Department of Biology, School of Arts and Sciences, Namik Kemal University, Turkey
| | - Erdogan Gultekin
- Department of Otorhinolaryngology, School of Medicine, Namik Kemal University, Turkey
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13
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Tan PX, Du SS, Ren C, Yao QW, Zheng R, Li R, Yuan YW. MicroRNA-207 enhances radiation-induced apoptosis by directly targeting Akt3 in cochlea hair cells. Cell Death Dis 2014; 5:e1433. [PMID: 25275594 PMCID: PMC4649514 DOI: 10.1038/cddis.2014.407] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2014] [Revised: 08/06/2014] [Accepted: 08/20/2014] [Indexed: 02/01/2023]
Abstract
MicroRNAs (miRNAs) have important roles in various types of cellular biological processes. Our study aimed to determine whether miRNAs function in the regulation of ionizing radiation (IR)-induced cell death in auditory cells and to determine how they affect the cellular response to IR. Microarray and qRT-PCR were performed to identify and confirm the differential expression of miRNAs in the cochlea hair cell line HEI-OC1 and in vivo after IR. Upregulation or downregulation of miRNAs using miRNA mimics or inhibitor were detected to characterize the biological effects of the indicated miRNAs. Bioinformatic analyses, luciferase reporter assays and mRNA knockdown were performed to identify a miRNA target gene. We determined that miR-207 was significantly upregulated after IR. MiR-207 enhances IR-induced apoptosis and DNA damage in HEI-OC1 cells. Furthermore, Akt3 was confirmed to be a direct target of miR-207. Downregulation of Akt3 mimics the effects of miR-207. MiR-207 enhances IR-induced apoptosis by directly targeting Akt3 and anti-miR-207 may have a potential role in protecting cochlea hair cells from IR.
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Affiliation(s)
- P-x Tan
- Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, China
| | - S-s Du
- Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, China
| | - C Ren
- Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, China
| | - Q-w Yao
- Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, China
| | - R Zheng
- Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, China
| | - R Li
- Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, China
| | - Y-w Yuan
- Department of Radiation Oncology, Nanfang Hospital, Southern Medical University, Guangzhou, Guangdong 510515, China
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14
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Mukherjea D, Ghosh S, Bhatta P, Sheth S, Tupal S, Borse V, Brozoski T, Sheehan KE, Rybak LP, Ramkumar V. Early investigational drugs for hearing loss. Expert Opin Investig Drugs 2014; 24:201-17. [PMID: 25243609 DOI: 10.1517/13543784.2015.960076] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
INTRODUCTION Sensorineural hearing loss (HL) is becoming a global phenomenon at an alarming rate. Nearly 600 million people have been estimated to have significant HL in at least one ear. There are several different causes of sensorineural HL included in this review of new investigational drugs for HL. They are noise-induced, drug-induced, sudden sensorineural HL, presbycusis and HL due to cytomegalovirus infections. AREAS COVERED This review presents trends in research for new investigational drugs encompassing a variety of causes of HL. The studies presented here are the latest developments either in the research laboratories or in preclinical, Phase 0, Phase I or Phase II clinical trials for drugs targeting HL. EXPERT OPINION While it is important that prophylactic measures are developed, it is extremely crucial that rescue strategies for unexpected or unavoidable cochlear insult be established. To achieve this goal for the development of drugs for HL, innovative strategies and extensive testing are required for progress from the bench to bedside. However, although a great deal of research needs to be done to achieve the ultimate goal of protecting the ear against acquired sensorineural HL, we are likely to see exciting breakthroughs in the near future.
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Affiliation(s)
- Debashree Mukherjea
- Southern Illinois University School of Medicine, Department of Surgery , P.O. Box 19629, Springfield, IL 62794-9629 , USA
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15
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Yang C, Zhang W, Liu XL, Liang Y, Yuan YW, Ren C, Peng JH. Localization of prestin and expression in the early period after radiation in mice. Eur Arch Otorhinolaryngol 2014; 271:3333-40. [DOI: 10.1007/s00405-014-3180-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2014] [Accepted: 06/26/2014] [Indexed: 10/25/2022]
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16
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Ma Z, Wei Q, Dong G, Huo Y, Dong Z. DNA damage response in renal ischemia-reperfusion and ATP-depletion injury of renal tubular cells. BIOCHIMICA ET BIOPHYSICA ACTA 2014; 1842:1088-96. [PMID: 24726884 PMCID: PMC4038345 DOI: 10.1016/j.bbadis.2014.04.002] [Citation(s) in RCA: 57] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/13/2014] [Revised: 03/25/2014] [Accepted: 04/02/2014] [Indexed: 12/12/2022]
Abstract
Renal ischemia-reperfusion leads to acute kidney injury (AKI) that is characterized pathologically by tubular damage and cell death, followed by tubular repair, atrophy and interstitial fibrosis. Recent work suggested the possible presence of DNA damage response (DDR) in AKI. However, the evidence is sketchy and the role and regulation of DDR in ischemic AKI remain elusive. In this study, we demonstrated the induction of phosphorylation of ATM, H2AX, Chk2 and p53 during renal ischemia-reperfusion in mice, suggesting DDR in kidney tissues. DDR was also induced in vitro during the recovery or "reperfusion" of renal proximal tubular cells (RPTCs) after ATP depletion. DDR in RPTCs was abrogated by supplying glucose to maintain ATP via glycolysis, indicating that the DDR depends on ATP depletion. The DDR was also suppressed by the general caspase inhibitor z-VAD and the overexpression of Bcl-2, supporting a role of apoptosis-associated DNA damage in the DDR. N-acetylcysteine (NAC), an antioxidant, suppressed the phosphorylation of ATM and p53 and, to a less extent, Chk2, but NAC increased the phosphorylation and nuclear foci formation of H2AX. Interestingly, NAC increased apoptosis, which may account for the observed H2AX activation. Ku55933, an ATM inhibitor, blocked ATM phosphorylation and ameliorated the phosphorylation of Chk2 and p53, but it increased H2AX phosphorylation and nuclear foci formation. Ku55933 also increased apoptosis in RPTCs following ATP depletion. The results suggest that DDR occurs during renal ischemia-reperfusion in vivo and ATP-depletion injury in vitro. The DDR is partially induced by apoptosis and oxidative stress-related DNA damage. ATM, as a sensor in the DDR, may play a cytoprotective role against tubular cell injury and death.
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Affiliation(s)
- Zhengwei Ma
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Georgia Reagents University and Charlie Norwood VA Medical Center, Augusta, GA 30912, USA
| | - Qingqing Wei
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Georgia Reagents University and Charlie Norwood VA Medical Center, Augusta, GA 30912, USA
| | - Guie Dong
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Georgia Reagents University and Charlie Norwood VA Medical Center, Augusta, GA 30912, USA
| | - Yuqing Huo
- Vascular Biology Center, Medical College of Georgia, Georgia Reagents University and Charlie Norwood VA Medical Center, Augusta, GA 30912, USA
| | - Zheng Dong
- Department of Cellular Biology and Anatomy, Medical College of Georgia, Georgia Reagents University and Charlie Norwood VA Medical Center, Augusta, GA 30912, USA; Department of Nephrology, The Second Xiangya Hospital, Central South University, Changsha, China.
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17
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Mechanisms of radiation-induced sensorineural hearing loss and radioprotection. Hear Res 2014; 312:60-8. [DOI: 10.1016/j.heares.2014.03.003] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2013] [Revised: 02/12/2014] [Accepted: 03/07/2014] [Indexed: 12/20/2022]
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18
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Kim J, Cho HJ, Sagong B, Kim SJ, Lee JT, So HS, Lee IK, Kim UK, Lee KY, Choo YS. Alpha-lipoic acid protects against cisplatin-induced ototoxicity via the regulation of MAPKs and proinflammatory cytokines. Biochem Biophys Res Commun 2014; 449:183-9. [DOI: 10.1016/j.bbrc.2014.04.118] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2014] [Accepted: 04/23/2014] [Indexed: 12/20/2022]
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19
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Mujica-Mota MA, Salehi P, Devic S, Daniel SJ. Safety and otoprotection of metformin in radiation-induced sensorineural hearing loss in the guinea pig. Otolaryngol Head Neck Surg 2014; 150:859-65. [PMID: 24500877 DOI: 10.1177/0194599814521013] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
OBJECTIVE There is currently no treatment available to prevent radiation-induced sensorineural hearing loss. Metformin has antineoplastic effects and is able to regulate the mitochondrial production of reactive oxygen species after cellular stress, which is one of the mechanisms involved in apoptosis after radiation damage. The objective of this study was to determine the safety and radioprotective properties of metformin against radiation-induced cochlear damage both in vitro and in vivo. STUDY DESIGN In vitro and prospective animal study. SETTING Animal Care Facilities of the Montreal Children's Hospital Research Institute. METHODS Cultured auditory hair cells (HEI-OC1) were exposed to different concentrations of metformin to determine its safety. Cells were incubated with different metformin concentrations and subjected to radiation. Cell viability after experiments was determined with the 3-(4,5-dimethylthiazol-2-yl)-5-(3-carboxymethoxyphenyl)-2-(4-sulfophenyl)-2H-tetrazolium (MTS) assay. Sixteen guinea pigs were divided in 2 groups: drinking tap water (n = 8) and drinking water containing metformin (n = 8). The animals were unilaterally irradiated for 20 days (total dose 70 Gy), and the ears were divided in 4 groups: control (n = 8), irradiated (n = 8), metformin (n = 8), and experimental (n = 8). Auditory brainstem responses were assessed before and 1, 6, and 16 weeks after completion of radiotherapy. RESULTS Metformin was not cytotoxic or radioprotective in cultured auditory hair cells. Experimental ears had less hearing loss than radiated ones; however, differences were not statistically significant (P > .05). CONCLUSION Metformin is not ototoxic or radioprotective in vitro or in vivo. Ears solely subjected to metformin had better hearing thresholds than the rest of the groups.
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20
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Inhibition of p38 mitogen-activated protein kinase ameliorates radiation-induced ototoxicity in zebrafish and cochlea-derived cell lines. Neurotoxicology 2013; 40:111-22. [PMID: 24374476 DOI: 10.1016/j.neuro.2013.12.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2013] [Revised: 12/04/2013] [Accepted: 12/10/2013] [Indexed: 11/21/2022]
Abstract
Radiation is a widely used treatment for head and neck cancers, and one of its most severe side effects is ototoxicity. Radiation-induced ototoxicity has been demonstrated to be linked to the increased production of ROS and MAPK. We intended to investigate the effect of p38 inhibition on radiation-induced ototoxicity in cochlea-derived HEI-OC1 cells and in a zebrafish model. The otoprotective effect of p38 inhibition against radiation was tested in vitro in the organ of Corti-derived cell line, HEI-OC1, and in vivo in a zebrafish model. Radiation-induced apoptosis, mitochondrial dysfunction, and an increase of intracellular NO generation were demonstrated in HEI-OC1 cells. The p38-specific inhibitor, SB203580, ameliorated radiation-induced apoptosis and mitochondrial injury in HEI-OC1 cells. p38 inhibition reduced radiation-induced activation of JNK, p38, cytochrome c, and cleavage of caspase-3 and PARP in HEI-OC1 cells. Scanning electron micrography showed that SB203580 prevented radiation-induced destruction of kinocilium and stereocilia in zebrafish neuromasts. The results of this study suggest that p38 plays an important role in mediating radiation-induced ototoxicity and inhibition of p38 could be a plausible option for preventing radiation ototoxicity.
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Key Words
- Apoptosis
- DMEM,
- DMSO,
- Dulbecco's modified Eagle's medium
- ERK,
- FBS,
- FITC,
- HNSCC,
- IHC,
- Inner hair cell
- JNK,
- MAPK,
- MMP,
- NO,
- PARP,
- PBS,
- PI,
- ROS,
- SB203580
- SEM,
- SNHL,
- TUNEL,
- c-Jun N-terminal kinase
- days post-fertilization
- dimethyl sulfoxide
- dpf,
- extracellular signal-regulated kinases
- fetal bovine serum
- fluorescein isothiocyanate
- head and neck squamous cell carcinoma
- hearing preservation
- mitochondrial membrane potential
- mitogen-activated protein kinase
- nitric oxide
- p38
- p38, p38
- phosphate buffered saline
- poly ADP ribose polymerase
- propidium iodide
- radiation
- reactive oxygen species
- scanning electron microscopy
- sensorineural hearing loss
- terminal deoxynucleotidyl transferase (TdT)-mediated dUTP-biotin nick end labeling
- zebrafish
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21
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Tan PX, Du SS, Ren C, Yao QW, Yuan YW. Radiation-induced Cochlea Hair Cell Death: Mechanisms and Protection. Asian Pac J Cancer Prev 2013; 14:5631-5. [DOI: 10.7314/apjcp.2013.14.10.5631] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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22
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Low WK. Idiopathic sudden hearing loss: is there a role for complementary treatment? J Altern Complement Med 2013; 19:785-6. [PMID: 23484523 DOI: 10.1089/acm.2012.0960] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Affiliation(s)
- Wong Kein Low
- Novena ENT-Head & Neck Specialist Centre, Mount Elizabeth Novena Specialist Centre , Singapore; and Duke-NUS Graduate Medical School, Singapore
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23
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24
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Pyun J, Kang S, Hwang H, Oh Y, Kang S, Lim Y, Choo O, Kim C. Epicatechin inhibits radiation-induced auditory cell death by suppression of reactive oxygen species generation. Neuroscience 2011; 199:410-20. [DOI: 10.1016/j.neuroscience.2011.09.012] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2011] [Revised: 09/03/2011] [Accepted: 09/07/2011] [Indexed: 10/17/2022]
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25
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Tokgoz B, Ucar C, Kocyigit I, Somdas M, Unal A, Vural A, Sipahioglu M, Oymak O, Utas C. Protective effect of N-acetylcysteine from drug-induced ototoxicity in uraemic patients with CAPD peritonitis. Nephrol Dial Transplant 2011; 26:4073-8. [DOI: 10.1093/ndt/gfr211] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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26
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Schachtele SJ, Mutnal MB, Schleiss MR, Lokensgard JR. Cytomegalovirus-induced sensorineural hearing loss with persistent cochlear inflammation in neonatal mice. J Neurovirol 2011; 17:201-11. [PMID: 21416394 DOI: 10.1007/s13365-011-0024-7] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2010] [Revised: 02/25/2011] [Accepted: 03/02/2011] [Indexed: 12/20/2022]
Abstract
Congenital cytomegalovirus (CMV) infection is the leading cause of sensorineural hearing loss (SNHL) in children. During murine (M)CMV-induced encephalitis, the immune response is important for both the control of viral dissemination and the clearance of virus from the brain. While the importance of CMV-induced SNHL has been described, the mechanisms surrounding its pathogenesis and the role of inflammatory responses remain unclear. This study presents a neonatal mouse model of profound SNHL in which MCMV preferentially infected both cochlear perilymphatic epithelial cells and spiral ganglion neurons. Interestingly, MCMV infection induced cochlear hair cell death by 21 days post-infection, despite a clear lack of direct infection of hair cells and the complete clearance of the virus from the cochlea by 14 dpi. Flow cytometric, immunohistochemical, and quantitative PCR analysis of MCMV-infected cochlea revealed a robust and chronic inflammatory response, including a prolonged increase in reactive oxygen species production by infiltrating macrophages. These data support a pivotal role for inflammation during MCMV-induced SNHL.
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MESH Headings
- Animals
- Animals, Newborn
- Antigens, CD/analysis
- Child
- Cloning, Molecular
- Cochlea/immunology
- Cochlea/pathology
- Cochlea/virology
- Cytomegalovirus/genetics
- Cytomegalovirus/growth & development
- Cytomegalovirus/immunology
- Cytomegalovirus Infections/complications
- Cytomegalovirus Infections/immunology
- Cytomegalovirus Infections/pathology
- Cytomegalovirus Infections/virology
- Disease Models, Animal
- Epithelial Cells/pathology
- Epithelial Cells/virology
- Escherichia coli
- Evoked Potentials, Auditory, Brain Stem
- Female
- Flow Cytometry
- Hearing Loss, Sensorineural/etiology
- Hearing Loss, Sensorineural/immunology
- Hearing Loss, Sensorineural/pathology
- Hearing Loss, Sensorineural/virology
- Humans
- Immunohistochemistry
- Inflammation/immunology
- Inflammation/pathology
- Inflammation/virology
- Lymphocytes/immunology
- Lymphocytes/virology
- Macrophages/immunology
- Macrophages/virology
- Mice
- Muromegalovirus/genetics
- Muromegalovirus/growth & development
- Muromegalovirus/immunology
- Neurons/pathology
- Neurons/virology
- Polymerase Chain Reaction
- Recombinant Proteins/genetics
- Recombinant Proteins/immunology
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Affiliation(s)
- Scott J Schachtele
- Center for Infectious Diseases and Microbiology Translational Research, Department of Medicine, University of Minnesota, Minneapolis, MN, USA
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