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Erythropoietin Reduces Neurodegeneration and Long-Term Memory Deficits Following Sevoflurane Exposure in Neonatal Rats. Neurotox Res 2019; 36:817-826. [DOI: 10.1007/s12640-019-00028-8] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2019] [Revised: 03/18/2019] [Accepted: 03/21/2019] [Indexed: 11/27/2022]
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Neuronal erythropoietin overexpression is protective against kanamycin-induced hearing loss in mice. Toxicol Lett 2018; 291:121-128. [PMID: 29654830 DOI: 10.1016/j.toxlet.2018.04.007] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2018] [Revised: 04/05/2018] [Accepted: 04/09/2018] [Indexed: 01/10/2023]
Abstract
Aminoglycosides have detrimental effects on the hair cells of the inner ear, yet these agents indisputably are one of the cornerstones in antibiotic therapy. Hence, there is a demand for strategies to prevent aminoglycoside-induced ototoxicity, which are not available today. In vitro data suggests that the pleiotropic growth factor erythropoietin (EPO) is neuroprotective against aminoglycoside-induced hair cell loss. Here, we use a mouse model with EPO-overexpression in neuronal tissue to evaluate whether EPO could also in vivo protect from aminoglycoside-induced hearing loss. Auditory brainstem response (ABR) thresholds were measured in 12-weeks-old mice before and after treatment with kanamycin for 15 days, which resulted in both C57BL/6 and EPO-transgenic animals in a high-frequency hearing loss. However, ABR threshold shifts in EPO-transgenic mice were significantly lower than in C57BL/6 mice (mean difference in ABR threshold shift 13.6 dB at 32 kHz, 95% CI 3.8-23.4 dB, p = 0.003). Correspondingly, quantification of hair cells and spiral ganglion neurons by immunofluorescence revealed that EPO-transgenic mice had a significantly lower hair cell and spiral ganglion neuron loss than C57BL/6 mice. In conclusion, neuronal overexpression of EPO is protective against aminoglycoside-induce hearing loss, which is in accordance with its known neuroprotective effects in other organs, such as the eye or the brain.
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Zhong C, Jiang Z, Guo Q, Zhang X. Protective effect of adenovirus-mediated erythropoietin expression on the spiral ganglion neurons in the rat inner ear. Int J Mol Med 2018; 41:2669-2677. [PMID: 29436578 PMCID: PMC5846647 DOI: 10.3892/ijmm.2018.3455] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2016] [Accepted: 01/11/2018] [Indexed: 11/29/2022] Open
Abstract
The aim of the present study was to evaluate the expression of erythropoietin (Epo) and the Epo receptor (Epo-R) in the spiral ganglion neurons (SGNs) of the rat inner ear, and to assess the effect of Epo adenovirus vector (Ad-Epo) on the spontaneous apoptosis of SGNs. A total of 60 ears from 30 healthy neonatal (2-3 days postnatal) Sprague-Dawley rats were used to examine the expression of Epo in the SGNs. The rats were divided into three groups: The negative control group, the vector control group [infected with a green fluorescent protein expression vector (Ad-GFP)] and the Ad-Epo group (infected with Ad-Epo). The expression of Epo and Epo-R was detected by immunohistochemistry and dual immunofluorescence staining using polyclonal antibodies directed against Epo and Epo-R, followed by confocal laser-scanning microscopy. An adenovirus vector was constructed and used to transfect the cultured SGNs. Following adenovirus infection, apoptosis of the SGNs was evaluated and Epo protein expression was assessed. Epo and Epo-R were widely expressed in the plasma membrane and the cytoplasm of the SGNs, as well as in the organ of Corti and the stria vascularis within the inner ear. Epo protein expression was upregulated in the Ad-Epo group compared with that in the other two groups (P<0.05). Apoptotic cells were seldom observed at day 4 of SGN culture in the negative control group. At day 7, marked apoptotic cells were detected in the negative control group and the vector control group. The apoptosis level in the Ad-Epo group was significantly decreased compared with that in the negative control group or the vector control group at day 7 (P<0.05). In conclusion, Epo and Epo-R are expressed in the SGNs of the inner ear of the rat, and Ad-Epo can decrease the spontaneous apoptosis of SGNs, which may provide a basis for the prevention or alleviation of sensorineural hearing loss.
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Affiliation(s)
- Cheng Zhong
- Department of Otolaryngology, Southwest Hospital, The Third Military Medical University, Chongqing 400038, P.R. China
| | - Zhendong Jiang
- Department of Otolaryngology, Southwest Hospital, The Third Military Medical University, Chongqing 400038, P.R. China
| | - Qiang Guo
- Department of Neurobiology, Chongqing Key Laboratory of Neurobiology, The Third Military Medical University, Chongqing 400038, P.R. China
| | - Xueyuan Zhang
- Department of Otolaryngology, Southwest Hospital, The Third Military Medical University, Chongqing 400038, P.R. China
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Qiao L, Fu J, Xue X, Shi Y, Yao L, Huang W, Li J, Zhang D, Liu N, Tong X, Du Y, Pan Y. Neuronalinjury and roles of apoptosis and autophagy in a neonatal rat model of hypoxia-ischemia-induced periventricular leukomalacia. Mol Med Rep 2018; 17:5940-5949. [PMID: 29436652 PMCID: PMC5866039 DOI: 10.3892/mmr.2018.8570] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2016] [Accepted: 06/20/2017] [Indexed: 11/06/2022] Open
Abstract
As research into periventricular leukomalacia (PVL) gradually increases, concerns are emerging about long‑term neuron injury. The present study aimed to investigate neuronal injury and the relevant alterations in apoptosis and autophagy in a PVL model established previously. A rat model of hypoxia‑ischemia‑induced PVL was established. In the model group, Sprague‑Dawley (SD) rats [postnatal day 3 (P3)] were subjected to right common carotid artery ligation followed by suturing and exposed to 6‑8% oxygen for 2 h; in the control group, SD rats (P3) were subjected to right common carotid artery dissection followed by suturing, without ligation and hypoxic exposure. At 1, 3, 7 and 14 days following modeling, brain tissue samples were collected and stained with hematoxylin and eosin. Cellular apoptosis was detected by terminal deoxynucleotidyl transferase dUTP nick end labeling (TUNEL) assay and the protein and mRNA expression alterations of neuronal nuclei (NeuN), caspase‑3 and Beclin 1 in the model group were detected by western blot analysis and reverse transcription‑quantitative polymerase chain reaction (RT‑qPCR) analyses. Compared with the control group, the protein and mRNA expression levels of NeuN (a marker of mature neurons) were markedly reduced, the number of positive cells was increased as detected by TUNEL, and the protein and mRNA expression levels of caspase‑3 and Beclin 1 were elevated in the model group. In the rat model of hypoxia‑ischemia‑induced PVL, oligodendrocyte injury and myelinization disorders were observed, in addition to neuron injury, a decrease in mature neurons and the co‑presence of apoptosis and autophagy. However, apoptosis and autophagy exist in different phases: Apoptosis is involved in neuron injury, while autophagy is likely to have a protective role.
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Affiliation(s)
- Lin Qiao
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Jianhua Fu
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Xindong Xue
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Yongyan Shi
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Li Yao
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Wanjie Huang
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Jun Li
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Dan Zhang
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Na Liu
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Xin Tong
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Yanna Du
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
| | - Yuqing Pan
- Department of Pediatrics, Shengjing Hospital of China Medical University, Shenyang, Liaoning 110004, P.R. China
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Fan D, Ren H, Danzeng D, Li H, Wang P. Influence of high-altitude hypoxic environments on the survival of cochlear hair cells and spiral ganglion neurons in rats. Biomed Rep 2016; 5:681-685. [PMID: 28101341 PMCID: PMC5228326 DOI: 10.3892/br.2016.791] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2016] [Accepted: 10/10/2016] [Indexed: 11/14/2022] Open
Abstract
The aim of the present study was to observe the histological changes in the peripheral auditory system in rats at different time-points after relocating from low altitude to high altitude (3,600 m). The general physical condition of the rats was observed and cochlear tissue samples were obtained every month. The morphology and survival of the cochlear hair cells (HCs) were observed using cochlear surface preparation at 1, 30, 90, 120, 150 and 180 days after moving to the plateau area. Changes in spiral ganglion neurons (SGNs) were detected at different time-points using immunofluorescence technology on frozen sections. No obvious morphological changes were observed in the cochlear HCs within 1–3 months of the rats moving to the plateau area, and there was little loss of outer HCs (OHCs) at 3 months. Cell swelling, dislocation and loss of cochlear OHCs were apparent at 4 months, and the losses of cochlear OHCs and inner HCs (IHCs) were 54 and 39%, respectively at 6 months. The loss of SGNs was observed at 3 months, and there was a loss of 28–35% of SGNs during 3–6 months. Thus, a high-altitude hypoxic environment influenced the cochlear HCs in rats after moving to the plateau area in a time-dependent manner. The damage to SGNs occurred earlier than the HCs, although SGN damage was not aggravated with time. Furthermore, compared with cochlear HCs, cochlear SGNs were identified to be markedly more sensitive to hypoxia, and exerted an adaptive mechanism to protect neurons from hypoxia.
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Affiliation(s)
- Dongyan Fan
- Department of Preventive Medicine, School of Medicine, Tibet University, Lhasa, Tibet 850002, P.R. China
| | - Hailong Ren
- Department of Preventive Medicine, School of Medicine, Tibet University, Lhasa, Tibet 850002, P.R. China
| | - Dunzhu Danzeng
- Department of Preventive Medicine, School of Medicine, Tibet University, Lhasa, Tibet 850002, P.R. China
| | - Haonan Li
- Department of Otolaryngology-Head and Neck Surgery, First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
| | - Ping Wang
- Department of Otolaryngology-Head and Neck Surgery, First Hospital of Jilin University, Changchun, Jilin 130021, P.R. China
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Kirkim G, Olgun Y, Aktas S, Kiray M, Kolatan E, Altun Z, Erçetin P, Bagriyanik A, Yilmaz O, Ellidokuz H. Is there a gender-related susceptibility for cisplatin ototoxicity? Eur Arch Otorhinolaryngol 2014; 272:2755-63. [DOI: 10.1007/s00405-014-3283-0] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2014] [Accepted: 09/04/2014] [Indexed: 11/28/2022]
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Olgun Y, Kırkım G, Kolatan E, Kıray M, Bagrıyanık A, Olgun A, Kızmazoglu DC, Ellıdokuz H, Serbetcıoglu B, Altun Z, Aktas S, Yılmaz O, Günerı EA. Friend or foe? Effect of oral resveratrol on cisplatin ototoxicity. Laryngoscope 2013; 124:760-6. [DOI: 10.1002/lary.24323] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 06/28/2013] [Indexed: 12/22/2022]
Affiliation(s)
- Yüksel Olgun
- Department of Otorhinolaryngology; Dokuz Eylül University School Of Medicine; Izmir Turkey
| | - Günay Kırkım
- Department of Otorhinolaryngology; Dokuz Eylül University School Of Medicine; Izmir Turkey
| | - Efsun Kolatan
- Department of Laboratory Of Animal Science; Dokuz Eylül University School Of Medicine; Izmir Turkey
| | - Müge Kıray
- Department of Physiology; Dokuz Eylül University School Of Medicine; Izmir Turkey
| | - Alper Bagrıyanık
- Department of Histology; Dokuz Eylül University School Of Medicine; Izmir Turkey
| | - Aybüke Olgun
- Department of Internal Medicine; Dokuz Eylül University School Of Medicine; Izmir Turkey
| | | | - Hülya Ellıdokuz
- Department of Biostatistics; Dokuz Eylül University School Of Medicine; Izmir Turkey
| | - Bulent Serbetcıoglu
- Department of Otorhinolaryngology; Dokuz Eylül University School Of Medicine; Izmir Turkey
| | - Zekiye Altun
- Department of Basic Oncology; Dokuz Eylül University School Of Medicine; Izmir Turkey
| | - Safiye Aktas
- Department of Basic Oncology; Dokuz Eylül University School Of Medicine; Izmir Turkey
| | - Osman Yılmaz
- Department of Laboratory Of Animal Science; Dokuz Eylül University School Of Medicine; Izmir Turkey
| | - Enis Alpin Günerı
- Department of Otorhinolaryngology; Dokuz Eylül University School Of Medicine; Izmir Turkey
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Wang P, Du B, Yin W, Wang X, Zhu W. Resveratrol attenuates CoCl2-induced cochlear hair cell damage through upregulation of Sirtuin1 and NF-κB deacetylation. PLoS One 2013; 8:e80854. [PMID: 24278331 PMCID: PMC3836748 DOI: 10.1371/journal.pone.0080854] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Accepted: 10/16/2013] [Indexed: 12/11/2022] Open
Abstract
The goals of this study were to investigate the effects of hypoxia on cochlear hair cell damage, and to explore the role of sirtuin1 in hypoxia-induced hair cell damage. Cochlear organotypic cultures from postnatal day 4 rats were used in this study. Hypoxia was induced by treating cochlear explants with CoCl2. Cochlear cultures were treated with CoCl2 alone or in combination with the sirtuin1 activator resveratrol and the sirtuin1 inhibitor sirtinol. Hair cell damage was identified by phalloidin staining and imaged using scanning electron microscopy. RT-PCR and Western blot analyses were used to detect the expression of sirtuin1 and acetylated nuclear factor-κB (NF-κB). Low concentrations of CoCl2 (100-200 μM) did not cause an obvious change in the number and morphology of hair cells, whereas higher concentrations of CoCl2 (300-400 μM) induced swelling of hair cells, accompanied by cell loss. Increased sirtuin1 expression was induced by CoCl2 at 100 to 200 μM, but not at 400 μM. NF-κB acetylation was significantly increased in explants treated with 400 μM CoCl2. Pretreatment with resveratrol prevented CoCl2-induced hair cell loss and acetylation of NF-κB. The protective effect of resveratrol was significantly reduced by sirtinol. CoCl2 induces hair cell damage in organotypic cochleae cultures. Resveratrol attenuates CoCl2-induced cochlear hair cell damage possibly via activation of sirtuin1, which deacetylates NF-κB.
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Affiliation(s)
- Ping Wang
- Department of Otolaryngology-Head and Neck Surgery, First Hospital of Jilin University, Changchun, China
| | - Bo Du
- Department of Otolaryngology-Head and Neck Surgery, First Hospital of Jilin University, Changchun, China
| | - Wanzhong Yin
- Department of Otolaryngology-Head and Neck Surgery, First Hospital of Jilin University, Changchun, China
| | - Xinrui Wang
- Key Laboratory of Zoonoses, Ministry of Education, Institute of Zoonoses, Jilin University, Changchun, China
| | - Wei Zhu
- Department of Otolaryngology-Head and Neck Surgery, First Hospital of Jilin University, Changchun, China
- * E-mail:
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