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Xu K, Chang X, Bai X, Liu HB, Chen XB, Chen HP, Liu YH. Activation of Nrf2 inhibits ferroptosis and protects against oxaliplatin-induced ototoxicity. Biomed Pharmacother 2023; 165:115248. [PMID: 37523980 DOI: 10.1016/j.biopha.2023.115248] [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: 04/24/2023] [Revised: 07/17/2023] [Accepted: 07/25/2023] [Indexed: 08/02/2023] Open
Abstract
Oxaliplatin, as a third-generation platinum-based anticancer drug, is widely used in tumor therapy of many systems. Clinically, oxaliplatin has a number of serious side effects, most notably neuropathy and ototoxicity. The degeneration of cochlear hair cells is the main reason for the hearing loss caused by platinum-based drugs. However, the mechanism of oxaliplatin-induced cochlear hair cell death remains unclear. Ferroptosis is a novel cell injury pattern triggered by the accumulation of iron hydroperoxides in lipids and dependent on the participation of iron ions, which plays an important role in a variety of diseases. Whether ferroptosis is involved in oxaliplatin-induced ototoxicity has not been reported. In this study, we observed that oxaliplatin treatment resulted in lipid peroxidation and reactive oxygen species (ROS) accumulation in OC1 cells, which may be an early alteration in the occurrence of ferroptosis. Additional treatment with ferroptosis inducer or inhibitor significantly aggravated or ameliorated oxaliplatin-induced cytotoxicity. Similarly, inhibition of ferroptosis also protected cochlear hair cells against oxaliplatin-induced injury. In addition, the expression of nuclear factor erythroid 2-related factor2 (Nrf2) and heme oxygenase-1 (HO-1) was significantly increased after oxaliplatin treatment, and treatment with the Nrf2 agonist, resveratrol, dramatically attenuated cochlear hair cell damage induced by oxaliplatin. Activation of Nrf2 significantly decreased the expression of iron regulatory protein 2 (IRP-2) and reversed the expression of glutathione peroxidase 4 (GPX4). Collectively, our results demonstrated that activation of Nrf2 alleviates oxaliplatin-induced cochlear hair cell damage by inhibiting ferroptosis, which may be a new mechanism of oxaliplatin-induced ototoxicity.
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Affiliation(s)
- Kai Xu
- Department of Otolaryngology, Head and Neck Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang 330006, China.
| | - Xu Chang
- Department of Otolaryngology, Head and Neck Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - Xue Bai
- Department of Otolaryngology, Head and Neck Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - Hong-Bing Liu
- Department of Otolaryngology, Head and Neck Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - Xu-Bo Chen
- Department of Otolaryngology, Head and Neck Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang 330006, China
| | - Hong-Ping Chen
- Department of Histology and Embryology, Medical College, Nanchang University, Nanchang, Jiangxi 330006, China.
| | - Yue-Hui Liu
- Department of Otolaryngology, Head and Neck Surgery, The Second Affiliated Hospital of Nanchang University, Nanchang 330006, China.
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Gersten BK, Fitzgerald TS, Fernandez KA, Cunningham LL. Ototoxicity and Platinum Uptake Following Cyclic Administration of Platinum-Based Chemotherapeutic Agents. J Assoc Res Otolaryngol 2020; 21:303-321. [PMID: 32583132 PMCID: PMC7445222 DOI: 10.1007/s10162-020-00759-y] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Accepted: 05/22/2020] [Indexed: 01/04/2023] Open
Abstract
Cisplatin is a widely used anti-cancer drug used to treat a variety of cancer types. One of the side effects of this life-saving drug is irreversible ototoxicity, resulting in permanent hearing loss in many patients. In order to understand why cisplatin is particularly toxic to the inner ear, we compared the hearing loss and cochlear uptake of cisplatin to that of two related drugs, carboplatin and oxaliplatin. These three drugs are similar in that each contains a core platinum atom; however, carboplatin and oxaliplatin are considered less ototoxic than cisplatin. We delivered these three drugs to mice using a 6-week cyclic drug administration protocol. We performed the experiment twice, once using equimolar concentrations of the drugs and once using concentrations of the drugs more proportional to those used in the clinic. For both concentrations, we detected a significant hearing loss caused by cisplatin and no hearing loss caused by carboplatin or oxaliplatin. Cochlear uptake of each drug was measured using inductively coupled plasma mass spectrometry (ICP-MS) to detect platinum. Cochlear platinum levels were highest in mice treated with cisplatin followed by oxaliplatin, while carboplatin was largely excluded from the cochlea. Even when the drug doses were increased, cochlear platinum remained low in mice treated with oxaliplatin or carboplatin. We also examined drug clearance from the inner ear by measuring platinum levels at 1 h and 24 h after drug administration. Our findings suggest that the reduced cochlear platinum we observed with oxaliplatin and carboplatin were not due to increased clearance of these drugs relative to cisplatin. Taken together, our data indicate that the differential ototoxicity among cisplatin, carboplatin, and oxaliplatin is attributable to differences in cochlear uptake of these three drugs.
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Affiliation(s)
- Benjamin K Gersten
- Section on Sensory Cell Biology, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD, 20814, USA
| | - Tracy S Fitzgerald
- Mouse Auditory Testing Core, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD, 20814, USA
| | - Katharine A Fernandez
- Section on Sensory Cell Biology, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD, 20814, USA. .,Porter Neuroscience Research Center, 35A Convent Drive, Room 1D-955, Bethesda, MD, 20892, USA.
| | - Lisa L Cunningham
- Section on Sensory Cell Biology, National Institute on Deafness and Other Communication Disorders, National Institutes of Health, Bethesda, MD, 20814, USA
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Ye H, Xing Y, Zhang L, Zhang J, Jiang H, Ding D, Shi H, Yin S. Bilirubin-induced neurotoxic and ototoxic effects in rat cochlear and vestibular organotypic cultures. Neurotoxicology 2018; 71:75-86. [PMID: 30578813 DOI: 10.1016/j.neuro.2018.12.004] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Revised: 12/16/2018] [Accepted: 12/18/2018] [Indexed: 12/15/2022]
Abstract
Exposure to high levels of bilirubin in hyperbilirubinemia patients and animal models can result in sensorineural deafness. However, the mechanisms underlying bilirubin-induced damage to the inner ear, including the cochlear and vestibular organs, remain unknown. The present analyses of cochlear and vestibular organotypic cultures obtained from postnatal day 3 rats exposed to bilirubin at varying concentrations (0, 10, 50, 100, or 250 μM) for 24 h revealed that auditory nerve fibers (ANFs) and vestibular nerve endings were destroyed even at low doses (10 and 50 μM). Additionally, as the bilirubin dose increased, spiral ganglion neurons (SGNs) and vestibular ganglion neurons (VGNs) exhibited gradual shrinkage in conjunction with nuclei condensation or fragmentation in a dose-dependent manner. The loss of cochlear and vestibular hair cells (HCs) was only evident in explants treated with the highest concentration of bilirubin (250 μM), and bilirubin-induced major apoptosis most likely occurred via the extrinsic apoptotic pathway. Thus, the present results indicate that inner ear neurons and fibers were more sensitive to, and exhibited more severe damage following, bilirubin-induced neurotoxicity than sensory HCs, which illustrates the underlying causes of auditory neuropathy and vestibulopathy in hyperbilirubinemia patients.
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Affiliation(s)
- Haibo Ye
- Department of Otorhinolaryngology, Affiliated Sixth People's Hospital of Shanghai Jiaotong University, 600 Yishan Road, Shanghai 200233, PR China
| | - Yazhi Xing
- Department of Otorhinolaryngology, Affiliated Sixth People's Hospital of Shanghai Jiaotong University, 600 Yishan Road, Shanghai 200233, PR China
| | - Ling Zhang
- Department of Otorhinolaryngology, Affiliated Sixth People's Hospital of Shanghai Jiaotong University, 600 Yishan Road, Shanghai 200233, PR China
| | - Jianhui Zhang
- Department of Otolaryngology Head and Neck Surgery, The Third People's Hospital of Chengdu, PR China
| | - Haiyan Jiang
- Center for Hearing and Deafness, Department of Communicative Disorders and Sciences State, University of New York at Buffalo, 137 Cary Hall, 3435 Main Street, Buffalo, NY 14214, USA
| | - Dalian Ding
- Department of Otorhinolaryngology, Affiliated Sixth People's Hospital of Shanghai Jiaotong University, 600 Yishan Road, Shanghai 200233, PR China; Center for Hearing and Deafness, Department of Communicative Disorders and Sciences State, University of New York at Buffalo, 137 Cary Hall, 3435 Main Street, Buffalo, NY 14214, USA.
| | - Haibo Shi
- Department of Otorhinolaryngology, Affiliated Sixth People's Hospital of Shanghai Jiaotong University, 600 Yishan Road, Shanghai 200233, PR China.
| | - Shankai Yin
- Department of Otorhinolaryngology, Affiliated Sixth People's Hospital of Shanghai Jiaotong University, 600 Yishan Road, Shanghai 200233, PR China
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Ding D, Jiang H, Zhang J, Xu X, Qi W, Shi H, Yin S, Salvi R. Cisplatin-induced vestibular hair cell lesion-less damage at high doses. J Otol 2018; 13:115-121. [PMID: 30671086 PMCID: PMC6335437 DOI: 10.1016/j.joto.2018.08.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 08/10/2018] [Accepted: 08/20/2018] [Indexed: 12/04/2022] Open
Abstract
Cisplatin, a widely used anticancer drug, damages hair cells in cochlear organotypic cultures at low doses, but paradoxically causes little damage at high doses resulting in a U-shaped dose-response function. To determine if the cisplatin dose-response function for vestibular hair cells follows a similar pattern, we treated vestibular organotypic cultures with doses of cisplatin ranging from 10 to 1000 μM. Vestibular hair cell lesions progressively increased as the dose of cisplatin increased with maximum damage occurring around 50–100 μM, but the lesions progressively decreased at higher doses resulting in little hair cell loss at 1000 μM. The U-shaped dose-response function for cisplatin-treated vestibular hair cells in culture appears to be regulated by copper transporters, Ctr1, ATP7A and ATP7B, that dose-dependently regulate the uptake, sequestration and extrusion of cisplatin.
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Affiliation(s)
- Dalian Ding
- Center for Hearing and Deafness, University at Buffalo, USA.,Department of Otolaryngology Head and Neck Surgery, Huashan Hospital, Fudan University, Shanghai, China
| | - Haiyan Jiang
- Center for Hearing and Deafness, University at Buffalo, USA
| | - Jianhui Zhang
- Department of Otolaryngology Head and Neck Surgery, The Third People's Hospital of Chengdu, China
| | | | - Weidong Qi
- Department of Otolaryngology Head and Neck Surgery, Huashan Hospital, Fudan University, Shanghai, China
| | - Haibo Shi
- Department of Otorhinolaryngology, Affiliated Sixth People's Hospital of Shanghai Jiaotong University, Shanghai, China
| | - Shankai Yin
- Department of Otorhinolaryngology, Affiliated Sixth People's Hospital of Shanghai Jiaotong University, Shanghai, China
| | - Richard Salvi
- Center for Hearing and Deafness, University at Buffalo, USA.,Department of Audiology and Speech-Language Pathology, Asia University, China
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Yu J, Ding D, Sun H, Salvi R, Roth JA. Trimethyltin-induced cochlear degeneration in rat. J Otol 2016; 11:118-126. [PMID: 29937820 PMCID: PMC6002597 DOI: 10.1016/j.joto.2016.07.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Revised: 07/27/2016] [Accepted: 07/29/2016] [Indexed: 12/28/2022] Open
Abstract
Trimethyltin (TMT) is an occupational and environmental health hazard behaving as a potent neurotoxin known to affect the central nervous system as well as the peripheral auditory system. However, the mechanisms underlying TMT-induced ototoxicity are poorly understood. To elucidate the effects of TMT on the cochlea, a single injection of 4 or 8 mg/kg TMT was administered intraperitoneally to adult rats. The compound action potential (CAP) threshold was used to assess the functional status of the cochlea and histological techniques were used to assess the condition of the hair cells and auditory nerve fibers. TMT at 4 mg/kg produced a temporary CAP threshold elevation of 25–60 dB that recovered by 28 d post-treatment. Although there was no hair cell loss with the 4 mg/kg dose, there was a noticeable loss of auditory nerve fibers particularly beneath the inner hair cells. TMT at 8 mg/kg produced a large permanent CAP threshold shift that was greatest at the high frequencies. The CAP threshold shift was associated with the loss of outer hair cells and inner hair cells in the basal, high-frequency region of the cochlea, considerable loss of auditory nerve fibers and a significant loss of spiral ganglion neurons in the basal turn. Spiral ganglion neurons showed evidence of soma shrinkage and nuclear condensation and fragmentation, morphological features of apoptotic cell death. TMT-induced damage was greatest in the high-frequency, basal region of the cochlea and the nerve fibers beneath the inner hair cells were the most vulnerable structures.
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Affiliation(s)
- Jintao Yu
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
- Center for Hearing and Deafness, University at Buffalo, Buffalo, NY 14214, USA
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
| | - Dalian Ding
- Center for Hearing and Deafness, University at Buffalo, Buffalo, NY 14214, USA
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
- Corresponding author. Center for Hearing and Deafness, State University at Buffalo, Buffalo, NY 14214, USA. Fax: +1 716 829 2980.
| | - Hong Sun
- Department of Otolaryngology Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, Hunan 410008, China
| | - Richard Salvi
- Center for Hearing and Deafness, University at Buffalo, Buffalo, NY 14214, USA
| | - Jerome A. Roth
- Department of Pharmacology and Toxicology, University at Buffalo, Buffalo, NY 14214, USA
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Zeng S, Sun X, Chen Z, Yu D, Chen B, Yin S. Low, but Not High, Doses of Cisplatin Damage Cochlear Hair Cells in C57 Mouse Organotypic Cultures. ORL J Otorhinolaryngol Relat Spec 2016; 78:177-86. [PMID: 27270730 DOI: 10.1159/000446189] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2015] [Accepted: 04/12/2016] [Indexed: 11/19/2022]
Abstract
AIMS The purpose of this study was to investigate the characteristics of cisplatin-induced C57 mouse cochlear hair cell damage in vitro. METHODS Forty-seven cochleae harvested from 2- to 4-day-old C57 mice were used. Forty specimens were treated with different concentrations of cisplatin (10, 25, 50, 100, 400, and 1,000 μmol/l) for 48 h. The remaining seven specimens were used as a control group. RESULTS The rate of hair cell loss increased from 14.5 to 78.4% over cisplatin concentrations of 10 to 100 μmol/l, whereas hair cell loss decreased to 48.8 and 8.77% at concentrations of 400 and 1,000 μmol/l, respectively. Apoptosis was detected by DAPI staining in the areas of hair cell damage. Hair cell loss rates differed significantly among the cisplatin-treated groups. Linear regression analysis of cisplatin dose versus hair cell number showed a significant negative correlation for cisplatin doses up to 100 μmol/l and a positive correlation with further increases up to 1,000 μmol/l. CONCLUSIONS We conclude that cisplatin-induced hair cell damage was concentration dependent only up to a certain dose and that injury resistance may occur in cochlear cells treated with higher doses of cisplatin.
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Affiliation(s)
- Shan Zeng
- Department of Otorhinolaryngology, Shanghai Jiao Tong University Affiliated Sixth People's Hospital, Shanghai, China
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Abstract
As most gene sequences and functional structures of internal organs in rats have been well studied, rat models are widely used in experimental medical studies. A large number of descriptions and atlas of the rat temporal bone have been published, but some detailed anatomy of its surface and inside structures remains to be studied. By focusing on some unique characteristics of the rat temporal bone, the current paper aims to provide more accurate and detailed information on rat temporal bone anatomy in an attempt to complete missing or unclear areas in the existed knowledge. We also hope this paper can lay a solid foundation for experimental rat temporal bone surgeries, and promote information exchange among colleagues, as well as providing useful guidance for novice researchers in the field of hearing research involving rats.
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Affiliation(s)
- Peng Li
- Department of Otolaryngology, Head and Neck Surgery, The Third Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510630, China.,Center for Hearing and Deafness, State University of New York at Buffalo, Buffalo, NY 14214, USA
| | - Kelei Gao
- Center for Hearing and Deafness, State University of New York at Buffalo, Buffalo, NY 14214, USA.,Department of Otolaryngology, Head and Neck Surgery, Xiangya Hospital, Central South University, Hunan 410013, China
| | - Dalian Ding
- Department of Otolaryngology, Head and Neck Surgery, The Third Affiliated Hospital, Sun Yat-Sen University, Guangzhou 510630, China.,Center for Hearing and Deafness, State University of New York at Buffalo, Buffalo, NY 14214, USA.,Department of Otolaryngology, Head and Neck Surgery, Xiangya Hospital, Central South University, Hunan 410013, China
| | - Richard Salvi
- Center for Hearing and Deafness, State University of New York at Buffalo, Buffalo, NY 14214, USA.,Department of Otolaryngology, Head and Neck Surgery, Xiangya Hospital, Central South University, Hunan 410013, China
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Li P, Ding D, Salvi R, Roth JA. Cobalt-Induced Ototoxicity in Rat Postnatal Cochlear Organotypic Cultures. Neurotox Res 2015; 28:209-21. [PMID: 26153487 DOI: 10.1007/s12640-015-9538-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2015] [Revised: 06/28/2015] [Accepted: 06/30/2015] [Indexed: 01/01/2023]
Abstract
Cobalt (Co) is a required divalent metal used in the production of metal alloys, batteries, and pigments and is a component of vitamin B12. Excessive uptake of Co is neurotoxic causing temporary or permanent hearing loss; however, its ototoxic effects on the sensory hair cells, neurons, and support cells in the cochlea are poorly understood. Accordingly, we treated postnatal day 3 rat cochlear organotypic cultures with various doses and durations of CoCl2 and quantified the damage to the hair cells, peripheral auditory nerve fibers, and spiral ganglion neurons (SGN). Five-day treatment with 250 μM CoCl2 caused extensive damage to hair cells and neurons which increased with dose and treatment duration. CoCl2 caused greater damage to outer hair cells than inner hair cells; damage was greatest in the base of the cochlea and decreased towards the base. CoCl2 increased expression of superoxide radical in hair cells and SGNs and SGN loss was characterized by nuclear condensation and fragmentation, morphological features of apoptosis. CoCl2 treatment increased the expression of caspase-3 indicative of caspase-mediated programmed cell death. These results identify hair cells and spiral ganglion neurons as the main targets of Co ototoxicity in vitro and implicate the superoxide radical as a trigger of caspase-mediated ototoxicity.
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Affiliation(s)
- Peng Li
- Department of Otolaryngology Head and Neck Surgery, The Third Affiliated Hospital of Sun Yat-Sen University, Guang Zhou, 510630, China
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