1
|
Gu X, Jiang K, Chen R, Chen Z, Wu X, Xiang H, Huang X, Nan B. Identification of common stria vascularis cellular alteration in sensorineural hearing loss based on ScRNA-seq. BMC Genomics 2024; 25:213. [PMID: 38413848 PMCID: PMC10897997 DOI: 10.1186/s12864-024-10122-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2023] [Accepted: 02/14/2024] [Indexed: 02/29/2024] Open
Abstract
BACKGROUND The stria vascularis (SV), located in the lateral wall of the cochlea, maintains cochlear fluid homeostasis and mechanoelectrical transduction (MET) activity required for sound wave conduction. The pathogenesis of a number of human inheritable deafness syndromes, age related hearing loss, drug-induced ototoxicity and noise-induced hearing loss results from the morphological changes and functional impairments in the development of the SV. In this study, we investigate the implications of intercellular communication within the SV in the pathogenesis of sensorineural hearing loss (SNHL). We aim to identify commonly regulated signaling pathways using publicly available single-cell transcriptomic sequencing (scRNA-seq) datasets. METHODS We analyzed scRNA-seq data, which was derived from studying the cochlear SV in mice with SNHL compared to normal adult mice. After quality control and filtering, we obtained the major cellular components of the mouse cochlear SV and integrated the data. Using Seurat's FindAllMarkers and FindMarkers packages, we searched for novel conservative genes and differential genes. We employed KEGG and GSEA to identify molecular pathways that are commonly altered among different types of SNHL. We utilized pySCENIC to discover new specific regulatory factors in SV subpopulation cells. With the help of CellChat, we identified changes in subpopulation cells showing similar trends across different SNHL types and their alterations in intercellular communication pathways. RESULTS Through the analysis of the integrated data, we discovered new conserved genes to SV specific cells and identified common downregulated pathways in three types of SNHL. The enriched genes for these pathways showing similar trends are primarily associated with the Electron Transport Chain, related to mitochondrial energy metabolism. Using the CellChat package, we further found that there are shared pathways in the incoming signaling of specific intermediate cells in SNHL, and these pathways have common upstream regulatory transcription factor of Nfe2l2. Combining the results from pySCENIC and CellChat, we predicted the transcription factor Nfe2l2 as an upstream regulatory factor for multiple shared cellular pathways in IC. Additionally, it serves as an upstream factor for several genes within the Electron Transport Chain. CONCLUSION Our bioinformatics analysis has revealed that downregulation of the mitochondrial electron transport chain have been observed in various conditions of SNHL. E2f1, Esrrb, Runx1, Yy1, and Gata2 could serve as novel important common TFs regulating the electron transport chain. Adm has emerged as a potential new marker gene for intermediate cells, while Itgb5 and Tesc show promise as potential new marker genes for marginal cells in the SV. These findings offer a new perspective on SV lesions in SNHL and provide additional theoretical evidence for the same drug treatment and prevention of different pathologies of SNHL.
Collapse
Affiliation(s)
- Xi Gu
- Department of Otorhinolaryngology, Head and Neck Surgery, the First Affiliated Hospital, Fujian Medical University, Fuzhou, China
- Fujian Institute of Otolaryngology, the First Affiliated Hospital, Fujian Medical University, Fuzhou, China
- Department of Otorhinolaryngology, Head and Neck Surgery, National Regional Medical Center, Binhai Campus of the First Affiliated Hospital, Fujian Medical University, Fuzhou, China
| | - Kanglun Jiang
- Department of Otorhinolaryngology-Head and Neck Surgery, Zhongshan Hospital, Fudan University, Fenglin Road 180, Xuhui District, Shanghai, 200030, People's Republic of China
| | - Ruru Chen
- Department of Otorhinolaryngology, the Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Zhifeng Chen
- Department of Otorhinolaryngology, Head and Neck Surgery, the First Affiliated Hospital, Fujian Medical University, Fuzhou, China
- Fujian Institute of Otolaryngology, the First Affiliated Hospital, Fujian Medical University, Fuzhou, China
- Department of Otorhinolaryngology, Head and Neck Surgery, National Regional Medical Center, Binhai Campus of the First Affiliated Hospital, Fujian Medical University, Fuzhou, China
| | - Xianmin Wu
- Department of Otolaryngology-Head and Neck Surgery, the First Affiliated Hospital of Wenzhou Medical University, Wenzhou, China
| | - Haijie Xiang
- Department of Otorhinolaryngology, the Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China
| | - Xinsheng Huang
- Department of Otorhinolaryngology-Head and Neck Surgery, Zhongshan Hospital, Fudan University, Fenglin Road 180, Xuhui District, Shanghai, 200030, People's Republic of China.
| | - Benyu Nan
- Department of Otorhinolaryngology, the Second Affiliated Hospital and Yuying Children's Hospital of Wenzhou Medical University, Wenzhou, China.
| |
Collapse
|
2
|
Herb M. NADPH Oxidase 3: Beyond the Inner Ear. Antioxidants (Basel) 2024; 13:219. [PMID: 38397817 PMCID: PMC10886416 DOI: 10.3390/antiox13020219] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2024] [Revised: 02/02/2024] [Accepted: 02/06/2024] [Indexed: 02/25/2024] Open
Abstract
Reactive oxygen species (ROS) were formerly known as mere byproducts of metabolism with damaging effects on cellular structures. The discovery and description of NADPH oxidases (Nox) as a whole enzyme family that only produce this harmful group of molecules was surprising. After intensive research, seven Nox isoforms were discovered, described and extensively studied. Among them, the NADPH oxidase 3 is the perhaps most underrated Nox isoform, since it was firstly discovered in the inner ear. This stigma of Nox3 as "being only expressed in the inner ear" was also used by me several times. Therefore, the question arose whether this sentence is still valid or even usable. To this end, this review solely focuses on Nox3 and summarizes its discovery, the structural components, the activating and regulating factors, the expression in cells, tissues and organs, as well as the beneficial and detrimental effects of Nox3-mediated ROS production on body functions. Furthermore, the involvement of Nox3-derived ROS in diseases progression and, accordingly, as a potential target for disease treatment, will be discussed.
Collapse
Affiliation(s)
- Marc Herb
- Institute for Medical Microbiology, Immunology and Hygiene, Faculty of Medicine, University Hospital Cologne, University of Cologne, 50935 Cologne, Germany;
- German Centre for Infection Research, Partner Site Bonn-Cologne, 50931 Cologne, Germany
- Cologne Cluster of Excellence on Cellular Stress Responses in Aging-Associated Diseases (CECAD), 50931 Cologne, Germany
| |
Collapse
|
3
|
Peng Z, Zhao C, Yang Z, Gong S, Du Z. D-galactose-induced mitochondrial oxidative damage and apoptosis in the cochlear stria vascularis of mice. BMC Mol Cell Biol 2023; 24:27. [PMID: 37605129 PMCID: PMC10441755 DOI: 10.1186/s12860-023-00480-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2023] [Accepted: 05/02/2023] [Indexed: 08/23/2023] Open
Abstract
BACKGROUND Age-related hearing loss, known as presbycusis, is the result of auditory system degeneration. Numerous studies have suggested that reactive oxygen species (ROS) and mitochondrial oxidative damage play important roles in the occurrence and progression of aging. The D-galactose (D-gal)-induced aging model is well known and widely utilized in aging research. Our previous studies demonstrate that administration of D-gal causes mitochondrial oxidative damage and causes subsequent dysfunction in the cochlear ribbon synapses, which in turn leads to hearing changes and early stage presbycusis. Stria vascularis (SV) cells are vital for hearing function. However, it is unclear to what extent D-gal induces oxidative damage and apoptosis in the cochlear SV of mice. In addition, the source of the causative ROS in the cochlear SV has not been fully investigated. METHODS In this study, we investigated ROS generation in the cochlear SV of mice treated with D-gal. Hearing function was measured using the auditory brainstem response (ABR). Immunofluorescence was used to examine apoptosis and oxidative damage. Transmission electron microscopy was also used to investigate the mitochondrial ultrastructure. DNA fragmentation was determined using the terminal deoxynucleotidyl transferase-mediated dUTP-biotin nick end-labeling (TUNEL) assay. Mitochondrial membrane potential (MMP) and ATP were also measured. RESULTS We found that D-gal-treated mice exhibited a significant shift in the mean amplitude and latency of the ABR; a remarkable increase in the levels of NADPH oxidase (NOX-2), Uncoupling protein 2 (UCP2) and cleaved caspase-3 (c-Cas3) was observed, as well as an increase in the number of TUNEL-positive cells were observed in the SV of mice. Both the expression of the DNA oxidative damage biomarker 8-hydroxy-2-deoxyguanosine (8-OHdG) and a commonly occurring mitochondrial DNA deletion were markedly elevated in the SV of mice that had been treated with D-gal to induce aging. Conversely, the ATP level and MMP were significantly reduced in D-gal-induced aging mice. We also found alterations in the mitochondrial ultrastructure in the SV of aging mice, which include swollen and distorted mitochondrial shape, shortened and thickened microvilli, and the accumulation of lysosomes in the SV. CONCLUSION Our findings suggest that the impairment of cochlear SV during presbycusis may be caused by mitochondrial oxidative damage and subsequent apoptosis.
Collapse
Affiliation(s)
- Zhe Peng
- Department of Otolaryngology Head and Neck Surgery, Beijing Friendship Hospital, Capital Medical University, No.95, Yong'an Road, Xicheng District, Beijing, 100050, China
- Clinical Center for Hearing Loss, Capital Medical University, Beijing, 100050, China
| | - Chunli Zhao
- Department of Otolaryngology Head and Neck Surgery, Beijing Friendship Hospital, Capital Medical University, No.95, Yong'an Road, Xicheng District, Beijing, 100050, China
- Clinical Center for Hearing Loss, Capital Medical University, Beijing, 100050, China
| | - Zijing Yang
- Department of Otolaryngology Head and Neck Surgery, Beijing Friendship Hospital, Capital Medical University, No.95, Yong'an Road, Xicheng District, Beijing, 100050, China
- Clinical Center for Hearing Loss, Capital Medical University, Beijing, 100050, China
| | - Shusheng Gong
- Department of Otolaryngology Head and Neck Surgery, Beijing Friendship Hospital, Capital Medical University, No.95, Yong'an Road, Xicheng District, Beijing, 100050, China.
- Clinical Center for Hearing Loss, Capital Medical University, Beijing, 100050, China.
| | - Zhengde Du
- Department of Otolaryngology Head and Neck Surgery, Beijing Friendship Hospital, Capital Medical University, No.95, Yong'an Road, Xicheng District, Beijing, 100050, China.
- Clinical Center for Hearing Loss, Capital Medical University, Beijing, 100050, China.
| |
Collapse
|
4
|
Chen P, Hao JJ, Li MW, Bai J, Guo YT, Liu Z, Shi P. Integrative Functional Transcriptomic Analyses Implicate Shared Molecular Circuits in Sensorineural Hearing Loss. Front Cell Neurosci 2022; 16:857344. [PMID: 35370561 PMCID: PMC8964368 DOI: 10.3389/fncel.2022.857344] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/18/2022] [Accepted: 02/21/2022] [Indexed: 12/20/2022] Open
Abstract
Sensorineural hearing loss (SNHL) is referred to as the most common type of hearing loss and typically occurs when the inner ear or the auditory nerve is damaged. Aging, noise exposure, and ototoxic drugs represent three main causes of SNHL, leading to substantial similarities in pathophysiological characteristics of cochlear degeneration. Although the common molecular mechanisms are widely assumed to underlie these similarities, its validity lacks systematic examination. To address this question, we generated three SNHL mouse models from aging, noise exposure, and cisplatin ototoxicity, respectively. Through constructing gene co-expression networks for the cochlear transcriptome data across different hearing-damaged stages, the three models are found to significantly correlate with each other in multiple gene co-expression modules that implicate distinct biological functions, including apoptosis, immune, inflammation, and ion transport. Bioinformatics analyses reveal several potential hub regulators, such as IL1B and CCL2, both of which are verified to contribute to apoptosis accompanied by the increase of (ROS) in in vitro model system. Our findings disentangle the shared molecular circuits across different types of SNHL, providing potential targets for the broad effective therapeutic agents in SNHL.
Collapse
Affiliation(s)
- Peng Chen
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China
- Kunming College of Life Science, University of Chinese Academy of Sciences, Kunming, China
| | - Jun-Jun Hao
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China
| | - Meng-Wen Li
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China
| | - Jing Bai
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China
- School of Future Technology, University of Chinese Academy of Sciences, Beijing, China
| | - Yuan-Ting Guo
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China
- Kunming College of Life Science, University of Chinese Academy of Sciences, Kunming, China
| | - Zhen Liu
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China
- *Correspondence: Zhen Liu,
| | - Peng Shi
- State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Sciences, Kunming, China
- School of Future Technology, University of Chinese Academy of Sciences, Beijing, China
- Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, Kunming, China
- Peng Shi,
| |
Collapse
|
5
|
Song L, Yu J, Zhang D, Li X, Chen L, Cai Z, Yu C. Androgen Excess Induced Mitochondrial Abnormality in Ovarian Granulosa Cells in a Rat Model of Polycystic Ovary Syndrome. Front Endocrinol (Lausanne) 2022; 13:789008. [PMID: 35370945 PMCID: PMC8967935 DOI: 10.3389/fendo.2022.789008] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/04/2021] [Accepted: 02/14/2022] [Indexed: 01/04/2023] Open
Abstract
BACKGROUND Androgen excess could profoundly lead to follicular dysplasia or atresia, and finally result in polycystic ovary syndrome (PCOS); however, the exact mechanism remains to be fully elucidated. METHODS PCOS model rats were induced by dehydroepiandrosterone, and their fertility was assessed. The ovarian granulosa cells (GCs) from matured follicles of PCOS model rats were collected and identified by immunofluorescence. The mitochondrial ultrastructure was observed by transmission electron microscope and the mitochondrial function was determined by detecting the adenosine triphosphate (ATP) content and mtDNA copy number. Besides, the expressions of respiratory chain complexes and ATP synthases in relation to mitochondrial function were analyzed. RESULTS The PCOS model rats were successfully induced, and their reproductive outcomes were obviously adverse. The GCs layer of the ovarian was apparently cut down and the mitochondrial ultrastructure of ovarian GCs was distinctly destroyed. The ATP content and mtDNA copy number of ovarian GCs in PCOS model rats were greatly reduced, and the expressions of NDUFB8 and ATP5j were significantly down-regulated without obvious deletion of mtDNA 4834-bp. CONCLUSIONS Androgen excess could damage mitochondrial ultrastructure and function of GCs in rat ovary by down-regulating expression of NDUFB8 and ATP5j in PCOS.
Collapse
Affiliation(s)
- Linyi Song
- Department of Gynecology of Traditional Chinese Medicine, Changhai Hospital, Chinese People’s Liberation Army (PLA) Naval Medical University, Shanghai, China
- Department of Traditional Chinese Medicine, HwaMei Hospital, University of Chinese Academy of Sciences, Ningbo, China
| | - Jin Yu
- Department of Gynecology of Traditional Chinese Medicine, Changhai Hospital, Chinese People’s Liberation Army (PLA) Naval Medical University, Shanghai, China
- International Peace Maternity and Child Health Hospital, School of Medicine, Shanghai Jiao Tong University, Shanghai, China
| | - Danying Zhang
- Department of Gynecology of Traditional Chinese Medicine, Changhai Hospital, Chinese People’s Liberation Army (PLA) Naval Medical University, Shanghai, China
| | - Xi Li
- Department of Gynecology of Traditional Chinese Medicine, Integrated Traditional Chinese and Western Medicine of Jiangsu Hospital, Chinese Academy of Medical Sciences, Nanjing, China
| | - Lu Chen
- Department of traditional Chinese and Western medicine, Zhejiang Association of Traditional Chinese Medicine, Hangzhou, China
| | - Zailong Cai
- Department of Biochemistry and Molecular Biology, Chinese People’s Liberation Army (PLA) Naval Medical University, Shanghai, China
- *Correspondence: Chaoqin Yu, ; Zailong Cai,
| | - Chaoqin Yu
- Department of Gynecology of Traditional Chinese Medicine, Changhai Hospital, Chinese People’s Liberation Army (PLA) Naval Medical University, Shanghai, China
- *Correspondence: Chaoqin Yu, ; Zailong Cai,
| |
Collapse
|
6
|
Shen F, Yang W, Cui J, Hou Y, Bai G. Small-Molecule Fluorogenic Probe for the Detection of Mitochondrial Temperature In Vivo. Anal Chem 2021; 93:13417-13420. [PMID: 34581568 DOI: 10.1021/acs.analchem.1c03554] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Mitochondria, as energy factories, participate in many metabolic processes and play vital roles in cell life. Most human diseases are caused by mitochondrial dysfunction, and mitochondrial temperature is an important indicator of mitochondrial function. Despite the biological importance of mitochondria, there are few tools for detecting changes in mitochondrial temperature in living organisms. Here, we report on a thermosensitive rhodamine B (RhB)-derived fluorogenic probe (RhBIV) that enables fluorescent labeling of cell mitochondria at concentrations as low as 1 μM. We demonstrate that this probe exhibits a temperature-dependent response in cell mitochondria. Furthermore, in mice, it has a long half-life (t1/2) and is primarily enriched in the liver. This unique thermosensitive probe offers a simple, nondestructive method for longitudinal monitoring of mitochondrial temperature both in vitro and in vivo to elucidate fundamental physiological and pathological processes related to mitochondrial function.
Collapse
Affiliation(s)
- Fukui Shen
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Haihe Education Park, 38 Tongyan Road, Tianjin 300353, People's Republic of China
| | - Wen Yang
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Haihe Education Park, 38 Tongyan Road, Tianjin 300353, People's Republic of China
| | - Jing Cui
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Haihe Education Park, 38 Tongyan Road, Tianjin 300353, People's Republic of China
| | - Yuanyuan Hou
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Haihe Education Park, 38 Tongyan Road, Tianjin 300353, People's Republic of China
| | - Gang Bai
- State Key Laboratory of Medicinal Chemical Biology, College of Pharmacy and Tianjin Key Laboratory of Molecular Drug Research, Nankai University, Haihe Education Park, 38 Tongyan Road, Tianjin 300353, People's Republic of China
| |
Collapse
|
7
|
He ZH, Li M, Fang QJ, Liao FL, Zou SY, Wu X, Sun HY, Zhao XY, Hu YJ, Xu XX, Chen S, Sun Y, Chai RJ, Kong WJ. FOXG1 promotes aging inner ear hair cell survival through activation of the autophagy pathway. Autophagy 2021; 17:4341-4362. [PMID: 34006186 PMCID: PMC8726647 DOI: 10.1080/15548627.2021.1916194] [Citation(s) in RCA: 63] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Presbycusis is the cumulative effect of aging on hearing. Recent studies have shown that common mitochondrial gene deletions are closely related to deafness caused by degenerative changes in the auditory system, and some of these nuclear factors are proposed to participate in the regulation of mitochondrial function. However, the detailed mechanisms involved in age-related degeneration of the auditory systems have not yet been fully elucidated. In this study, we found that FOXG1 plays an important role in the auditory degeneration process through regulation of macroautophagy/autophagy. Inhibition of FOXG1 decreased the autophagy activity and led to the accumulation of reactive oxygen species and subsequent apoptosis of cochlear hair cells. Recent clinical studies have found that aspirin plays important roles in the prevention and treatment of various diseases by regulating autophagy and mitochondria function. In this study, we found that aspirin increased the expression of FOXG1, which further activated autophagy and reduced the production of reactive oxygen species and inhibited apoptosis, and thus promoted the survival of mimetic aging HCs and HC-like OC-1 cells. This study demonstrates the regulatory function of the FOXG1 transcription factor through the autophagy pathway during hair cell degeneration in presbycusis, and it provides a new molecular approach for the treatment of age-related hearing loss. Abbreviations: AHL: age-related hearing loss; baf: bafilomycin A1; CD: common deletion; D-gal: D-galactose; GO: glucose oxidase; HC: hair cells; mtDNA: mitochondrial DNA; RAP: rapamycin; ROS: reactive oxygen species; TMRE: tetramethylrhodamine, ethyl ester
Collapse
Affiliation(s)
- Zu-Hong He
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Department of Otorhinolaryngology, Xiangyang Central Hospital, Affiliated Hospital Of Hubei University Of Arts and Science, Xiangyang 441021, China
| | - Ming Li
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Qiao-Jun Fang
- State Key Laboratory of Bioelectronics, School of Life Sciences and Technology, Jiangsu Province High-Tech Key Laboratory for Bio-Medical Research, Southeast University, Nanjing, China
| | - Fu-Ling Liao
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China.,Xiangyang Central Hospital, Affiliated Hospital of Hubei University of Arts and Science
| | - Sheng-Yu Zou
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xia Wu
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Hai-Ying Sun
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xue-Yan Zhao
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yu-Juan Hu
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Xiao-Xiang Xu
- Department of Otorhinolaryngology, Xiangyang Central Hospital, Affiliated Hospital Of Hubei University Of Arts and Science, Xiangyang 441021, China
| | - Sen Chen
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Yu Sun
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | - Ren-Jie Chai
- State Key Laboratory of Bioelectronics, School of Life Sciences and Technology, Jiangsu Province High-Tech Key Laboratory for Bio-Medical Research, Southeast University, Nanjing, China.,Co-Innovation Center of Neuroregeneration, Nantong University, Nantong, China.,Institute for Stem Cell and Regeneration, Chinese Academy of Science, Beijing, China.,Jiangsu Province High-Tech Key Laboratory for Bio-Medical Research, Southeast University, Nanjing, China.,Beijing Key Laboratory of Neural Regeneration and Repair, Capital Medical University, Beijing, China
| | - Wei-Jia Kong
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| |
Collapse
|
8
|
Datta A, Alam MJ, Khaleda L, Al-Forkan M. Protective effects of Corchorus olitorius and Butea monosperma against Arsenic induced aberrant methylation and mitochondrial DNA damage in wistar rat model. Toxicol Rep 2021; 8:30-37. [PMID: 33391994 PMCID: PMC7772721 DOI: 10.1016/j.toxrep.2020.12.017] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2020] [Revised: 11/07/2020] [Accepted: 12/16/2020] [Indexed: 11/26/2022] Open
Abstract
Arsenic exposure through food causes genotoxic effects in vivo. Sub chronic exposure to Arsenic causes pre-cancerous changes. C. olitorious & B. monosperma have significant nephro & hepato protective potential. Protective effect of both plants species is evident in molecular level. Potent use as readily available food supplement to minimize Arsenic toxicity.
Millions of people around the world are chronically exposed to Arsenic (As) through food and drinking water. Studies revealed that Arsenic is genotoxic and causes damage to DNA. In this study, we evaluated Corchorus olitorius and Butea monosperma for their alleviative properties against Arsenic induced genotoxicity in vivo using Wistar Rat model. Arsenic exposed rats were given C. olitorius leaf powder and B. monosperma flower powder as supplementation with normal food. Methylation status of p53 promoter was measured using Methylation Sensitive Restriction Endonuclease PCR (MSRE-PCR) assay and mitochondrial DNA (mtDNA) copy number as well as occurrence of a common deletion in mtDNA in liver and kidney tissue was determined through quantitative realtime PCR (qPCR). Arsenic exposed rats after supplementation showed relatively less severe effects of toxicity evident by significantly higher amount of (p<0.05) mtDNA copy number and reduced occurrence of deletion containing mtDNA as well as lower levels of methylation in p53 gene promoter. Histopathological analysis revealed less severe histopathological changes of liver and kidney and normal liver and kidney function parameters in supplemented rats. So, the protective properties of B. monosperma and C. olitorius against Arsenic toxicity is evident in molecular level.
Collapse
Affiliation(s)
- Amit Datta
- Department of Genetic Engineering and Biotechnology, Faculty of Biological Sciences, University of Chittagong, Chittagong, 4331, Bangladesh
| | - Md Jibran Alam
- Department of Genetic Engineering and Biotechnology, Faculty of Biological Sciences, University of Chittagong, Chittagong, 4331, Bangladesh
| | - Laila Khaleda
- Department of Genetic Engineering and Biotechnology, Faculty of Biological Sciences, University of Chittagong, Chittagong, 4331, Bangladesh
| | - Mohammad Al-Forkan
- Department of Genetic Engineering and Biotechnology, Faculty of Biological Sciences, University of Chittagong, Chittagong, 4331, Bangladesh
| |
Collapse
|
9
|
Pu X, Luo A, Su H, Zhang K, Tian C, Chen B, Chai P, Xia X. Optimization and mechanism of postponing aging of polysaccharides from Chinese herbal medicine formula. Toxicol Res (Camb) 2020; 9:239-248. [PMID: 32670555 DOI: 10.1093/toxres/tfaa020] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 03/03/2020] [Indexed: 11/14/2022] Open
Abstract
To study the extraction technology of polysaccharides (AAP) from Chinese herbal medicine formula and its mechanism of delaying aging. First, L9(3)4 orthogonal test was used to optimize the optimal enzyme-assisted extraction parameters of polysaccharides. And the anti-aging effects was evaluated by detecting mitochondrial function, protein, DNA, adhesion molecules and cell cycle in aging rats. The optimal extraction process parameters were the cellulase concentration of 1.5%, the pH at 5, the enzyme temperature at 50°C and the extraction time of 180 min. The anti-aging results showed that AAP can effectively increase the activities of malate dehydrogenase, succinate dehydrogenase and superoxide dismutase. It also can decrease the activity of monoamine oxidase and methane dicarboxylic aldehyde levels in the brain tissue. Meanwhile, the polysaccharides enhanced telomerase activity while reduced p16 protein expression of the brain mitochondria. In addition, the polysaccharides continued to improve heart damage and significantly lessen mitochondrial DNA concentrations. For a certain period of time, it also enhanced the activity of superoxide dismutase, reduced glutathione, glutathione peroxidase and decreased protein carbonyl and methane dicarboxylic aldehyde content of kidney in D-galactose-induced aging rats. Furthermore, the polysaccharides restored the number of cells in the peripheral blood lines and BMNC through inhibiting the drop of the number of red blood cells, white blood cells, platelets in the peripheral blood and bone marrow mononuclear cell of the aging rats. At the same time, AAP accelerated G1 phase cell to enter S phase in cell cycle in aging rats. Our research suggests that the polysaccharides may be a potential anti-aging agent and can be further developed as a functional food or new drug to delay aging or treat aging-related diseases.
Collapse
Affiliation(s)
- Xiuying Pu
- School of Life Science and Engineering, Lanzhou University of Technology, The Key Lab of Screening, Evaluation and Advanced Processing of TCM and Tibetan Medicine, Gansu Educational Department, No. 287, Langongping Road, Qilihe District, Lanzhou 730050, Gansu, China
| | - Amiao Luo
- School of Life Science and Engineering, Lanzhou University of Technology, The Key Lab of Screening, Evaluation and Advanced Processing of TCM and Tibetan Medicine, Gansu Educational Department, No. 287, Langongping Road, Qilihe District, Lanzhou 730050, Gansu, China
| | - Hui Su
- School of Life Science and Engineering, Lanzhou University of Technology, The Key Lab of Screening, Evaluation and Advanced Processing of TCM and Tibetan Medicine, Gansu Educational Department, No. 287, Langongping Road, Qilihe District, Lanzhou 730050, Gansu, China
| | - Kaili Zhang
- School of Life Science and Engineering, Lanzhou University of Technology, The Key Lab of Screening, Evaluation and Advanced Processing of TCM and Tibetan Medicine, Gansu Educational Department, No. 287, Langongping Road, Qilihe District, Lanzhou 730050, Gansu, China
| | - Changyi Tian
- School of Life Science and Engineering, Lanzhou University of Technology, The Key Lab of Screening, Evaluation and Advanced Processing of TCM and Tibetan Medicine, Gansu Educational Department, No. 287, Langongping Road, Qilihe District, Lanzhou 730050, Gansu, China
| | - Bo Chen
- School of Life Science and Engineering, Lanzhou University of Technology, The Key Lab of Screening, Evaluation and Advanced Processing of TCM and Tibetan Medicine, Gansu Educational Department, No. 287, Langongping Road, Qilihe District, Lanzhou 730050, Gansu, China
| | - Pengdi Chai
- School of Life Science and Engineering, Lanzhou University of Technology, The Key Lab of Screening, Evaluation and Advanced Processing of TCM and Tibetan Medicine, Gansu Educational Department, No. 287, Langongping Road, Qilihe District, Lanzhou 730050, Gansu, China
| | - Xiaoyu Xia
- School of Life Science and Engineering, Lanzhou University of Technology, The Key Lab of Screening, Evaluation and Advanced Processing of TCM and Tibetan Medicine, Gansu Educational Department, No. 287, Langongping Road, Qilihe District, Lanzhou 730050, Gansu, China
| |
Collapse
|
10
|
D-Galactose-induced oxidative stress and mitochondrial dysfunction in the cochlear basilar membrane: an in vitro aging model. Biogerontology 2020; 21:311-323. [PMID: 32026209 PMCID: PMC7196095 DOI: 10.1007/s10522-020-09859-x] [Citation(s) in RCA: 32] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Accepted: 01/29/2020] [Indexed: 12/15/2022]
Abstract
The cochlear basilar membrane (CBM) contains inner hair cells and outer hair cells that convert sound waves into electrical signals and transmit them to the central auditory system. Cochlear aging, the primary reason of age-related hearing loss, can reduce the signal transmission capacity. There is no ideal in vitro aging model of the CBM. In this study, we cultured the CBM, which was dissected from the cochlea of the C57BL/6 mice 5 days after birth, in a medium containing 20 mg/mL, 40 mg/mL, or 60 mg/mL D-galactose (D-gal). Compared with the control group, the levels of senescence-associated β-galactosidase were increased in a concentration-dependent manner in the CBM of the D-gal groups. In addition, levels of the mitochondrial superoxide and patterns of an age-related mitochondrial DNA3860-bp deletion were significantly increased. The ATP levels and the membrane potential of the mitochondrial were significantly decreased in the CBM of the D-gal groups compared with the control group. Furthermore, in comparison with the control group, damaged hair cell stereocilia and a loss of inner hair cell ribbon synapses were observed in the CBM of the D-gal groups. A loss of hair cells and activation of caspase-3-mediated outer hair cell apoptosis were also observed in the CBM of the high-dose D-gal group. These insults induced by D-gal in the CBM in vitro were similar to the ones that occur in cochlear natural aging in vivo. Thus, we believe that this is a successful in vitro aging model using cultured CBM. These results demonstrate the effects of mitochondrial oxidative damage on presbycusis and provide a reliable aging model to study the mechanisms of presbycusis in vitro.
Collapse
|
11
|
The nuclear transcription factor FoxG1 affects the sensitivity of mimetic aging hair cells to inflammation by regulating autophagy pathways. Redox Biol 2019; 28:101364. [PMID: 31731101 PMCID: PMC6920089 DOI: 10.1016/j.redox.2019.101364] [Citation(s) in RCA: 117] [Impact Index Per Article: 23.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2019] [Revised: 10/22/2019] [Accepted: 10/27/2019] [Indexed: 12/18/2022] Open
Abstract
Inflammation is a self-defense response to protect individuals from infection and tissue damage, but excessive or persistent inflammation can have adverse effects on cell survival. Many individuals become especially susceptible to chronic-inflammation-induced sensorineural hearing loss as they age, but the intrinsic molecular mechanism behind aging individuals' increased risk of hearing loss remains unclear. FoxG1 (forkhead box transcription factor G1) is a key transcription factor that plays important roles in hair cell survival through the regulation of mitochondrial function, but how the function of FoxG1 changes during aging and under inflammatory conditions is unknown. In this study, we first found that FoxG1 expression and autophagy both increased gradually in the low concentration lipopolysaccharide (LPS)-induced inflammation model, while after high concentration of LPS treatment both FoxG1 expression and autophagy levels decreased as the concentration of LPS increased. We then used siRNA to downregulate Foxg1 expression in hair cell-like OC-1 cells and found that cell death and apoptosis were significantly increased after LPS injury. Furthermore, we used d-galactose (D-gal) to create an aging model with hair cell-like OC-1 cells and cochlear explant cultures in vitro and found that the expression of Foxg1 and the level of autophagy were both decreased after D-gal and LPS co-treatment. Lastly, we knocked down the expression of Foxg1 under aged inflammation conditions and found increased numbers of dead and apoptotic cells. Together these results suggest that FoxG1 affects the sensitivity of mimetic aging hair cells to inflammation by regulating autophagy pathways.
Collapse
|
12
|
D-Galactose-induced accelerated aging model: an overview. Biogerontology 2019; 20:763-782. [PMID: 31538262 DOI: 10.1007/s10522-019-09837-y] [Citation(s) in RCA: 200] [Impact Index Per Article: 40.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2019] [Accepted: 09/17/2019] [Indexed: 02/06/2023]
Abstract
To facilitate the process of aging healthily and prevent age-related health problems, efforts to properly understand aging mechanisms and develop effective and affordable anti-aging interventions are deemed necessary. Systemic administration of D-galactose has been established to artificially induce senescence in vitro and in vivo as well as for anti-aging therapeutic interventions studies. The aim of this article is to comprehensively discuss the use of D-galactose to generate a model of accelerated aging and its possible underlying mechanisms involved in different tissues/organs.
Collapse
|
13
|
He J, Huang Y, Du G, Wang Z, Xiang Y, Wang Q. Lasting spatial learning and memory deficits following chronic cerebral hypoperfusion are associated with hippocampal mitochondrial aging in rats. Neuroscience 2019; 415:215-229. [DOI: 10.1016/j.neuroscience.2019.04.044] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2018] [Revised: 04/18/2019] [Accepted: 04/23/2019] [Indexed: 12/16/2022]
|
14
|
Walters BJ, Cox BC. Approaches for the study of epigenetic modifications in the inner ear and related tissues. Hear Res 2019; 376:69-85. [PMID: 30679030 PMCID: PMC6456365 DOI: 10.1016/j.heares.2019.01.007] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Revised: 12/12/2018] [Accepted: 01/11/2019] [Indexed: 12/12/2022]
Abstract
DNA methylation and histone modifications such as methylation, acetylation, and phosphorylation, are two types of epigenetic modifications that alter gene expression. These additions to DNA regulatory elements or to the tails of histones can be inherited or can also occur de novo. Since epigenetic modifications can have significant effects on various processes at both the cellular and organismal level, there has been a rapid increase in research on this topic throughout all fields of biology in recent years. However, epigenetic research is relativity new for the inner ear field, likely due to the limited number of cells present and their quiescent nature. Here, we provide an overview of methods used to detect DNA methylation and histone modifications with a focus on those that have been validated for use with limited cell numbers and a discussion of the strengths and limitations for each. We also provide examples for how these methods have been used to investigate the epigenetic landscape in the inner ear and related tissues.
Collapse
Affiliation(s)
- Bradley J Walters
- Departments of Neurobiology and Anatomical Sciences, and of Otolaryngology and Communicative Sciences, University of Mississippi Medical Center, Jackson, MS, 39216, USA
| | - Brandon C Cox
- Departments of Pharmacology and Surgery, Division of Otolaryngology, Southern Illinois University School of Medicine, Springfield, IL 62711, USA.
| |
Collapse
|
15
|
Tavanai E, Mohammadkhani G, Farahani S, Jalaie S. Protective Effects of Silymarin Against Age-Related Hearing Loss in an Aging Rat Model. Indian J Otolaryngol Head Neck Surg 2018; 71:1248-1257. [PMID: 31750160 DOI: 10.1007/s12070-018-1294-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Accepted: 03/07/2018] [Indexed: 01/21/2023] Open
Abstract
Age-related hearing loss (ARHL) is one of the most common chronic degenerative disorders. Several studies have indicated that supplementation with some antioxidants can slow down the progression of ARHL. Despite several lines of evidence about the potent antioxidant and anti-aging effects of silymarin, its protective effect against ARHL has not evaluated yet. The aim of the current study was to investigate the effects of silymarin in prevention of ARHL in a d-Galactose-induced aging rat model for the first time. 45 male wistar rats aged 3-month old were divided into 5 groups: group 1, 2 and 3 received 500 mg/kg/day d-Gal plus 100, 200 and 300 mg/kg/day silymarin respectively for 8 weeks, placebo group received 500 mg/kg/day d-Gal plus propylene glycol as placebo, and control group received normal saline during this period of time. Auditory brainstem responses were measured at several frequencies (4, 6, 8, 12 and 16 kHz) before and after the intervention. Placebo group and group 3 showed significant ABR threshold increase across frequencies of 4, 6, 16 kHz compared with the other groups (P < 0.05). However, rats treated with silymarin 100 and 200 mg/kg/day plus d-Gal did not show any significant ABR threshold shifts. Similarly, ABR amplitude of P2 at 4, 8 kHz and P1, P4 at 4 kHz in the placebo group and group 3 were decreased significantly compared with other groups (P < 0.05). However, no significant differences are found in ABR absolute and inter-peak latencies between groups (P > 0.05). The findings indicates that silymarin with doses of 100 and 200 mg/kg/day has protective effect against ARHL and it can be supplemented into the diet of older people to slow down the progression of age-related hearing loss.
Collapse
Affiliation(s)
- Elham Tavanai
- Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences, Pich-e-Shemiran, Enghelab Ave, Tehran, Iran
| | - Ghassem Mohammadkhani
- Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences, Pich-e-Shemiran, Enghelab Ave, Tehran, Iran
| | - Saeid Farahani
- Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences, Pich-e-Shemiran, Enghelab Ave, Tehran, Iran
| | - Shohreh Jalaie
- Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences, Pich-e-Shemiran, Enghelab Ave, Tehran, Iran
| |
Collapse
|
16
|
Tavanai E, Mohammadkhani G. Role of antioxidants in prevention of age-related hearing loss: a review of literature. Eur Arch Otorhinolaryngol 2016; 274:1821-1834. [PMID: 27858145 DOI: 10.1007/s00405-016-4378-6] [Citation(s) in RCA: 97] [Impact Index Per Article: 12.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/08/2016] [Accepted: 11/08/2016] [Indexed: 01/21/2023]
Abstract
Age-related hearing loss (ARHL), also known as presbycusis, is one of the most prevalent chronic degenerative conditions. It is characterized by a decline in auditory function. ARHL is caused by the interaction of multiple factors, including cochlear aging, environment, genetic predisposition, and health comorbidities. The primary pathology of ARHL includes the hair cells loss, stria vascularis atrophy, and loss of spiral ganglion neurons as well as the changes in central auditory pathways. The research to date suggests that oxidative stress and mitochondrial DNA deletion (mtDNA) play a major role in pathophysiology of ARHL. Therefore, similar to other otological conditions, several studies have also showed that antioxidants can slow ARHL, but some also indicate that antioxidant therapy is not a magic elixir that will prevent or treat hearing loss associated with aging completely, but why? All available clinical trials, including animal and human studies, in English language that examined the protective effects of antioxidants against ARHL were reviewed. Materials were obtained by searching ELSEVIER, PubMed, Scopus, Web of knowledge, Google Scholar databases, Clinical trials, and Cochrane database of systematic reviews. Although ARHL has been shown to be slowed by supplementation with antioxidants, particularly in laboratory animals, a few studies have investigated the effect of interventions against ARHL in humans. High-quality clinical trials are needed to investigate if ARHL can be delayed or prevented in humans. However, it seems that targeting several cell-death pathways is better than targeting the only oxidative stress pathway.
Collapse
Affiliation(s)
- Elham Tavanai
- Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences, Piche-Shemiran, Enghelab Ave, Tehran, Iran
| | - Ghassem Mohammadkhani
- Department of Audiology, School of Rehabilitation, Tehran University of Medical Sciences, Piche-Shemiran, Enghelab Ave, Tehran, Iran.
| |
Collapse
|
17
|
Nie H, Chen G, He J, Zhang F, Li M, Wang Q, Zhou H, Lyu J, Bai Y. Mitochondrial common deletion is elevated in blood of breast cancer patients mediated by oxidative stress. Mitochondrion 2016; 26:104-12. [PMID: 26678158 PMCID: PMC4846287 DOI: 10.1016/j.mito.2015.12.001] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2015] [Revised: 11/25/2015] [Accepted: 12/04/2015] [Indexed: 02/07/2023]
Abstract
The 4977 bp common deletion is one of the most frequently observed mitochondrial DNA (mtDNA) mutations in human tissues and has been implicated in various human cancer types. It is generally believed that continuous generation of intracellular reactive oxygen species (ROS) during oxidative phosphorylation (OXPHOS) is a major underlying mechanism for generation of such mtDNA deletions while antioxidant systems, including Manganese superoxide dismutase (MnSOD), mitigating the deleterious effects of ROS. However, the clinical significance of this common deletion remains to be explored. A comprehensive investigation on occurrence and accumulation of the common deletion and mtDNA copy number was carried out in breast carcinoma (BC) patients, benign breast disease (BBD) patients and age-matched healthy donors in our study. Meanwhile, the representative oxidative (ROS production, mtDNA and lipid oxidative damage) and anti-oxidative features (MnSOD expression level and variation) in blood samples from these groups were also analyzed. We found that the mtDNA common deletion is much more likely to be detected in BC patients at relatively high levels while the mtDNA content is lower. This alteration has been associated with a higher MnSOD level and higher oxidative damages in both BC and BBD patients. Our results indicate that the mtDNA common deletion in blood may serve a biomarker for the breast cancer.
Collapse
Affiliation(s)
- Hezhongrong Nie
- Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, College of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Guorong Chen
- Department of Pathology of the First Affiliated Hospital, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Jing He
- Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, College of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Fengjiao Zhang
- Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, College of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Ming Li
- Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, College of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Qiufeng Wang
- Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, College of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Huaibin Zhou
- Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, College of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China
| | - Jianxin Lyu
- Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, College of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China.
| | - Yidong Bai
- Key Laboratory of Laboratory Medicine, Ministry of Education, Zhejiang Provincial Key Laboratory of Medical Genetics, College of Laboratory Medicine and Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, China.
| |
Collapse
|
18
|
Tatar A, Tasdemir S, Sahin I, Bozoglu C, Erdem HB, Yoruk O, Tatar A. Mitochondrial DNA deletions in patients with chronic suppurative otitis media. Eur Arch Otorhinolaryngol 2015; 273:2473-9. [PMID: 26620342 DOI: 10.1007/s00405-015-3839-7] [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: 08/21/2015] [Accepted: 11/18/2015] [Indexed: 11/25/2022]
Abstract
The aim of this study was to investigate the 4977 and 7400 bp deletions of mitochondrial DNA in patients with chronic suppurative otitis media and to indicate the possible association of mitochondrial DNA deletions with chronic suppurative otitis media. Thirty-six patients with chronic suppurative otitis media were randomly selected to assess the mitochondrial DNA deletions. Tympanomastoidectomy was applied for the treatment of chronic suppurative otitis media, and the curettage materials including middle ear tissues were collected. The 4977 and 7400 bp deletion regions and two control regions of mitochondrial DNA were assessed by using the four pair primers. DNA was extracted from middle ear tissues and peripheral blood samples of the patients, and then polymerase chain reactions (PCRs) were performed. PCR products were separated in 2 % agarose gel. Seventeen of 36 patients had the heterozygote 4977 bp deletion in the middle ear tissue but not in peripheral blood. There wasn't any patient who had the 7400 bp deletion in mtDNA of their middle ear tissue or peripheral blood tissue. The patients with the 4977 bp deletion had a longer duration of chronic suppurative otitis media and a higher level of hearing loss than the others (p < 0.01). Long time chronic suppurative otitis media and the reactive oxygen species can cause the mitochondrial DNA deletions and this may be a predisposing factor to sensorineural hearing loss in chronic suppurative otitis media. An antioxidant drug as a scavenger agent may be used in long-term chronic suppurative otitis media.
Collapse
Affiliation(s)
- Arzu Tatar
- Department of Otorhinolaryngology, Head and Neck Surgery, Faculty of Medicine, Ataturk University, Erzurum, Turkey.
| | - Sener Tasdemir
- Department of Medical Genetics, Faculty of Medicine, Ataturk University, Erzurum, Turkey
| | - Ibrahim Sahin
- Department of Medical Genetics, Faculty of Medicine, Ataturk University, Erzurum, Turkey
| | - Ceyda Bozoglu
- Department of Molecular Biology, Faculty of Science, Ataturk University, Erzurum, Turkey
| | - Haktan Bagis Erdem
- Department of Medical Genetics, Faculty of Medicine, Ataturk University, Erzurum, Turkey
| | - Ozgur Yoruk
- Department of Otorhinolaryngology, Head and Neck Surgery, Faculty of Medicine, Ataturk University, Erzurum, Turkey
| | - Abdulgani Tatar
- Department of Medical Genetics, Faculty of Medicine, Ataturk University, Erzurum, Turkey
| |
Collapse
|
19
|
Du Z, Li S, Liu L, Yang Q, Zhang H, Gao C. NADPH oxidase 3‑associated oxidative stress and caspase 3‑dependent apoptosis in the cochleae of D‑galactose‑induced aged rats. Mol Med Rep 2015; 12:7883-90. [PMID: 26498835 PMCID: PMC4758280 DOI: 10.3892/mmr.2015.4430] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2014] [Accepted: 07/23/2015] [Indexed: 01/27/2023] Open
Abstract
Oxidative damage to mitochondrial DNA (mtDNA) and cell apoptosis are heavily implicated in aging. Our previous study established a mimetic rat model of aging in the cochleae using D‑galactose (D‑gal), and revealed that chronic injection of D‑gal can increase oxidative stress and mtDNA common deletions (CD). The aim of the present study was to investigate the sources of reactive oxygen species and the occurrence of apoptosis in the cochleae of rats following 8 weeks of D‑gal exposure. The results of the present study indicated that an elevated accumulation of the mtDNA CD and mitochondrial ultrastructural damage occurred in the cochleae of rats injected with D‑gal for 8 weeks. In addition, the levels of 8‑hydroxy‑2‑deoxyguanosine, NADPH oxidase (NOX) 3, P22phox and cleaved caspase 3, and the number of terminal deoxynucleotidyl transferase‑mediated deoxyuridine triphosphate nick‑end‑labelling‑positive cells were increased in the cochleae of D‑gal‑treated rats, compared with the controls. These findings suggested that nitric oxide synthase NOX3‑associated oxidative stress may contribute to the accumulation of mtDNA mutations and activate a caspase 3‑dependent apoptotic signalling pathway in the cochleae during aging. The present study also provided novel insights into the development of age‑associated hearing loss, also termed presbycusis.
Collapse
Affiliation(s)
- Zhengde Du
- Department of Otorhinolaryngology, Nanshan Affiliated Hospital of Guangdong Medical College, Shenzhen, Guangdong 518052, P.R. China
| | - Shuo Li
- Department of Otorhinolaryngology, Nanshan Affiliated Hospital of Guangdong Medical College, Shenzhen, Guangdong 518052, P.R. China
| | - Lin Liu
- Department of Pharmacology, College of Pharmacy, Guangxi Medical University, Nanning, Guangxi Zhuang Autonomous Region 530021, P.R. China
| | - Qiong Yang
- Department of Otorhinolaryngology, Nanshan Affiliated Hospital of Guangdong Medical College, Shenzhen, Guangdong 518052, P.R. China
| | - Hongwei Zhang
- Department of Otorhinolaryngology, Nanshan Affiliated Hospital of Guangdong Medical College, Shenzhen, Guangdong 518052, P.R. China
| | - Chunsheng Gao
- Department of Otorhinolaryngology, Nanshan Affiliated Hospital of Guangdong Medical College, Shenzhen, Guangdong 518052, P.R. China
| |
Collapse
|
20
|
Zabihi Diba L, Mohaddes Ardebili SM, Gharesouran J, Houshmand M. Age-related decrease in mtDNA content as a consequence of mtDNA 4977 bp deletion. Mitochondrial DNA A DNA Mapp Seq Anal 2015; 27:3008-12. [PMID: 26152346 DOI: 10.3109/19401736.2015.1063046] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
As one of the most frequent somatic mutations accumulated during aging in human mitochondrial DNA, the 4977 bp deletion has intrigued scientific interest in recent years. Although many studies have shown a significant increase in the amount of 4977 bp deletion, the findings with respect to an age-dependent escalate of ΔmtDNA4977 bp in blood are still disputatious. Therefore, we investigated the presence of common deletion and mtDNA deletion level in whole blood samples of 100 old individuals (60-90 years). We detected the accumulation of common deletion in 46 old individuals. Consequently, there was statistically significant difference between the aged and young individuals in mitochondrial content (p = 0.01) and deletion levels ranged from 2% to 17% of the total mtDNA (mean: 10% ± 0.02%). We conclude that common deletion has decreased the mtDNA content; however, it is not clearly detectable in the blood as one of the fast replicating tissues comparing with tissues with low mitotic activity.
Collapse
Affiliation(s)
- Leila Zabihi Diba
- a Department of Biochemistry and Clinical Laboratory , Division of Medical Genetics, Faculty of Medicine, Tabriz University of Medical Sciences , Tabriz , Iran and
| | - Seyed Mojtaba Mohaddes Ardebili
- a Department of Biochemistry and Clinical Laboratory , Division of Medical Genetics, Faculty of Medicine, Tabriz University of Medical Sciences , Tabriz , Iran and
| | - Jalal Gharesouran
- a Department of Biochemistry and Clinical Laboratory , Division of Medical Genetics, Faculty of Medicine, Tabriz University of Medical Sciences , Tabriz , Iran and
| | - Massoud Houshmand
- b Department of Medical Genetics , National Institute for Genetic Engineering and Biotechnology , Tehran , Iran
| |
Collapse
|
21
|
NADPH oxidase 2-dependent oxidative stress, mitochondrial damage and apoptosis in the ventral cochlear nucleus of d-galactose-induced aging rats. Neuroscience 2015; 286:281-92. [DOI: 10.1016/j.neuroscience.2014.11.061] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2014] [Revised: 11/20/2014] [Accepted: 11/20/2014] [Indexed: 01/11/2023]
|
22
|
Cebe T, Yanar K, Atukeren P, Ozan T, Kuruç AI, Kunbaz A, Sitar ME, Mengi M, Aydın MŞ, Eşrefoğlu M, Aydın S, Çakatay U. A comprehensive study of myocardial redox homeostasis in naturally and mimetically aged rats. AGE (DORDRECHT, NETHERLANDS) 2014; 36:9728. [PMID: 25384832 PMCID: PMC4226800 DOI: 10.1007/s11357-014-9728-y] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2014] [Accepted: 10/29/2014] [Indexed: 05/31/2023]
Abstract
Age-related myocardial dysfunction has important implications with impaired redox homeostasis. Current study focused on investigation of redox homeostasis and histopathological changes in the myocardium of mimetically (MA), naturally aged (NA), and young control (YC) rats. Chronic D-galactose administration to young male Wistar rats (5 months old) was used to set up experimental aging models. We investigated 16 different oxidative damage biomarkers which have evaluated redox homeostasis of cellular macromolecules such as protein, lipid, and DNA. As a protein oxidation biomarker, advanced oxidation end products, protein carbonyl groups, protein-bound advanced glycation end products, dityrosine, kynurenine, and N-formylkynurenine concentrations in MA and NA rats were found to be significantly higher compared to those in YC rats. On the other hand, the levels of protein thiol groups were not significantly different between groups, whereas lipid peroxidation biomarkers such as conjugated diens, lipid hydroperoxides, and malondialdehyde in MA and NA rats were found to be significantly higher in comparison to those in YCs. For the assessment of oxidative DNA damage, we analyzed eight hydroxy-5'-deoxyguanosine concentrations of MA and NA groups which were higher than YCs. As an antioxidant status in the MA and NA groups, Cu-Zn superoxide dismutase, ferric reducing antioxidant power, and total thiol levels were lower than those in the YCs. Only nonprotein thiol levels were not significantly different. We also observed similar histopathological changes in MA and NA rats. We concluded that the mimetic aging model could be considered as a reliable experimental model for myocardial senescence.
Collapse
Affiliation(s)
- Tamer Cebe
- />Basic Sciences, Cerrahpaşa Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Karolin Yanar
- />Department of Medical Biochemistry, Cerrahpaşa Faculty of Medicine, Istanbul University, 34098 Fatih, Istanbul Turkey
| | - Pınar Atukeren
- />Department of Medical Biochemistry, Cerrahpaşa Faculty of Medicine, Istanbul University, 34098 Fatih, Istanbul Turkey
| | - Tuna Ozan
- />Basic Sciences, Cerrahpaşa Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Aylin Irmak Kuruç
- />Basic Sciences, Cerrahpaşa Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Ahmad Kunbaz
- />Basic Sciences, Cerrahpaşa Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Mustafa Erinç Sitar
- />Department of Medical Biochemistry, Cerrahpaşa Faculty of Medicine, Istanbul University, 34098 Fatih, Istanbul Turkey
| | - Murat Mengi
- />Department of Physiology, Cerrahpaşa Faculty of Medicine, Istanbul University, Istanbul, Turkey
| | - Mehmet Şerif Aydın
- />Department of Histology and Embryology, Bezmialem Vakif University Medical Faculty, Istanbul, Turkey
| | - Mukaddes Eşrefoğlu
- />Department of Histology and Embryology, Bezmialem Vakif University Medical Faculty, Istanbul, Turkey
| | - Seval Aydın
- />Department of Medical Biochemistry, Cerrahpaşa Faculty of Medicine, Istanbul University, 34098 Fatih, Istanbul Turkey
| | - Ufuk Çakatay
- />Department of Medical Biochemistry, Cerrahpaşa Faculty of Medicine, Istanbul University, 34098 Fatih, Istanbul Turkey
| |
Collapse
|
23
|
Liu H, Han Y, Wang S, Wang H. Association between the mitochondrial DNA 4977 common deletion in the hair shaft and hearing loss in presbycusis. Mol Med Rep 2014; 11:1127-31. [PMID: 25373716 DOI: 10.3892/mmr.2014.2877] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Accepted: 07/21/2014] [Indexed: 11/06/2022] Open
Abstract
The aim of the present study was to examine the role of the mitochondrial (mt) DNA common deletion (CD) 4977 (mtDNACD4977) in the hair shaft in patients with presbycusis. A total of 87 individuals with presbycusis and 95 normal‑hearing controls were selected based on strict audiometric criteria. Nested polymerase chain reaction (PCR), sequencing and quantitative (q)PCR were used to examine the expression levels of mtDNACD4977 in the hair shaft in presbycusis. Nested PCR of the hair shaft demonstrated that 8/95 cases with normal hearing were found to be positive for mtDNACD4977, as compared with 59/87 cases in the presbycusis group. The mtDNACD4977 was positive in 22/43 cases with mild‑to‑moderate hearing loss, 25/31 cases with moderate‑to‑severe, severe hearing loss, and 12/13 cases with profound deafness. Statistically significant differences in mtDNACD4977 expression were identified among all of the groups (P<0.001). The sequencing and qPCR assays demonstrated a trend towards an increase in the mean CD level of mtDNACD4977 with a more severe hearing loss at 8 kHz (r=0.778, P<0.001) and all ranges of frequency (r=0.858, P<0.001). In conclusion, the present study demonstrates a correlation between mtDNACD4977 in the human hair shaft and the severity of hearing loss in presbycusis.
Collapse
Affiliation(s)
- Hong Liu
- Department of Otorhinolaryngology Head and Neck Surgery, Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250000, P.R. China
| | - Yuechen Han
- Department of Otorhinolaryngology Head and Neck Surgery, Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250000, P.R. China
| | - Shuai Wang
- Department of Thoracic Surgery, Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250000, P.R. China
| | - Haibo Wang
- Department of Otorhinolaryngology Head and Neck Surgery, Provincial Hospital Affiliated to Shandong University, Jinan, Shandong 250000, P.R. China
| |
Collapse
|
24
|
Du Z, Yang Q, Zhou T, Liu L, Li S, Chen S, Gao C. D‑galactose‑induced mitochondrial DNA oxidative damage in the auditory cortex of rats. Mol Med Rep 2014; 10:2861-7. [PMID: 25324030 PMCID: PMC4227424 DOI: 10.3892/mmr.2014.2653] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/21/2013] [Accepted: 06/02/2014] [Indexed: 11/29/2022] Open
Abstract
Chronic administration of D-galactose (D-gal) is a useful method for establishing a model of natural aging in the auditory system. Previous studies have demonstrated that NADPH oxidases (NOXs) may be an important source of reactive oxygen species (ROS) in the peripheral auditory system (PAS) and cause an increase in mitochondrial DNA (mtDNA) common deletion (CD) levels in the PAS and central auditory system (CAS) of rats with D-gal-induced aging. However, the source of the ROS in the CAS and the mechanisms of age-related hearing loss (ARHL) have yet to be elucidated. In the present study, male Sprague Dawley rats were administered a daily injection of D-gal (150, 300 and 500 mg/kg, respectively) for eight weeks. All three doses of D-gal caused a significant increase in the expression of NOX2, 8-hydroxy-2-deoxyguanosine, a biomarker of DNA oxidative damage, and uncoupling protein 2, together with a decrease in the mitochondrial total antioxidant capabilities in the auditory cortex, as compared with the control rats (injected daily with the same volume of 0.9% saline for eight weeks). The levels of the mtDNA CD were also increased in the auditory cortex of the D-gal-induced aging rats. These findings suggest that both NOX- and mitochondria-associated ROS generation may contribute to mtDNA oxidative damage in the auditory cortex of the CAS of D-gal-induced aging rats. This study may provide novel insight into the development of ARHL.
Collapse
Affiliation(s)
- Zhengde Du
- Department of Otorhinolaryngology, Nanshan Affiliated Hospital of Guangdong Medical College, Shenzhen, Guangdong 518052, P.R. China
| | - Qiong Yang
- Department of Otorhinolaryngology, Nanshan Affiliated Hospital of Guangdong Medical College, Shenzhen, Guangdong 518052, P.R. China
| | - Tao Zhou
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, Hubei 430022, P.R. China
| | - Lin Liu
- College of Pharmacy, Guangxi Medical University, Nanning, Guangxi Zhuang Autonomous Region 530021, P.R. China
| | - Shuo Li
- Department of Otorhinolaryngology, Nanshan Affiliated Hospital of Guangdong Medical College, Shenzhen, Guangdong 518052, P.R. China
| | - Shixiong Chen
- Shenzhen Institutes of Advanced Technology, Chinese Academy of Sciences, Shenzhen, Guangdong 518055, P.R. China
| | - Chunsheng Gao
- Department of Otorhinolaryngology, Nanshan Affiliated Hospital of Guangdong Medical College, Shenzhen, Guangdong 518052, P.R. China
| |
Collapse
|
25
|
Yu J, Wang Y, Liu P, Li Q, Sun Y, Kong W. Mitochondrial DNA common deletion increases susceptibility to noise-induced hearing loss in a mimetic aging rat model. Biochem Biophys Res Commun 2014; 453:515-20. [PMID: 25285633 DOI: 10.1016/j.bbrc.2014.09.118] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2014] [Accepted: 09/26/2014] [Indexed: 12/20/2022]
Abstract
Noise-induced hearing loss (NIHL) is an important occupational health hazard. However, susceptibility to NIHL remains poorly understood. The present study was designed to investigate whether mitochondrial DNA common deletion (CD) increases the susceptibility of individuals to NIHL. A mimetic aging rat model harboring increased CD in the inner ear was established by chronic d-galactose administration, and the synergic effect of CD and noise on hearing sensitivity was assessed. We determined that although developed the same magnitude of temporary threshold shifts and hair cell loss, the d-galactose treated rats with increased CD in the inner ear exhibited a longer hearing recovery process and experienced higher permanent hearing threshold shifts at high frequencies than the saline-treated control rats. Greater supporting cell damage and stria vascularis ultrastructural changes were observed in d-galactose treated rats three weeks after recovery. The results suggested that the elevated CD in the inner ear could increase an individual's susceptibility to NIHL, which likely through a reduction in the self-repairing capability within the cochlea after acoustic injury.
Collapse
Affiliation(s)
- Jintao Yu
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China; Department of Otolaryngology-Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha 410008, China
| | - Yanjun Wang
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Peng Liu
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Qingyu Li
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China
| | - Yu Sun
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China.
| | - Weijia Kong
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China.
| |
Collapse
|
26
|
Wu X, Wang Y, Sun Y, Chen S, Zhang S, Shen L, Huang X, Lin X, Kong W. Reduced expression of Connexin26 and its DNA promoter hypermethylation in the inner ear of mimetic aging rats induced by d-galactose. Biochem Biophys Res Commun 2014; 452:340-6. [PMID: 25159847 DOI: 10.1016/j.bbrc.2014.08.063] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2014] [Accepted: 08/12/2014] [Indexed: 01/21/2023]
Abstract
Connexin26 (Cx26), one of the major protein subunits forming gap junctions (GJs), is important in maintaining homeostasis in the inner ear and normal hearing. Cx26 mutation is one of the most common causes for inherited nonsyndromic deafness, but the relationship between Cx26 and presbycusis is unknown. Our study aimed at exploring the expression and the aberrant methylation of the promoter region of Cx26 gene in the cochlea of inner ear mimetic aging rats. We applied a mimetic aging of inner ear rat model with mtDNA common deletion by d-gal injection for 8weeks. Real-time RT-PCR and Western blot of rat inner ear tissue indicated that the Cx26 expression decreased in the d-gal group. Further bisulfite sequencing analysis revealed that the methylation status of the promoter region of Cx26 gene in the d-gal group was higher than that in control group. These results indicated that the decrease of Cx26 expression might contribute to the development of presbycusis and the hypermethylation of promoter region of GJB2 might be associated with the Cx26 downregulation.
Collapse
Affiliation(s)
- Xia Wu
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, PR China
| | - Yanjun Wang
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, PR China
| | - Yu Sun
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, PR China.
| | - Sen Chen
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, PR China
| | - Shuai Zhang
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, PR China
| | - Ling Shen
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, PR China
| | - Xiang Huang
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, PR China
| | - Xi Lin
- Department of Otolaryngology, Emory University School of Medicine, 615 Michael Street, Atlanta, GA 30322-3030, USA
| | - Weijia Kong
- Department of Otolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, PR China; Institute of Otorhinolaryngology, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, PR China.
| |
Collapse
|
27
|
SIQUEIRA RAQUELG, SILVA DAYSEADA, MELO LUIZDDE, CARVALHO ELIZEUFDE, FERREIRA-MACHADO SAMARAC, ALMEIDA CARLOSEDE. Common Deletion (CD) in mitochondrial DNA of irradiated rat heart. AN ACAD BRAS CIENC 2014; 86:685-694. [DOI: 10.1590/0001-37652014110912] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2012] [Accepted: 04/25/2013] [Indexed: 12/19/2022] Open
Abstract
The purpose of this study was to map the common deletion (CD) area in mtDNA and investigate the levels of this deletion in irradiated heart. The assays were developed in male Wistar rats that were irradiated with three different single doses (5, 10 or 15 Gy) delivered directly to the heart and the analyses were performed at various times post-irradiation (3, 15 or 120 days). The CDs area were sequenced and the CD quantified by real-time PCR. Our study demonstrated that the CD levels progressively decreased from the 3rduntil the 15th day after irradiation, and then increased thereafter. Additionally, it was observed that the levels of CD are modulated differently according to the different categories of doses (moderate and high). This study demonstrated an immediate response to ionizing radiation, measured by the presence of mutations in the CD area and a decrease in the CD levels.
Collapse
Affiliation(s)
- RAQUEL G. SIQUEIRA
- Universidade do Estado do Rio de Janeiro, Brasil; Universidade do Estado do Rio de Janeiro, Brasil
| | | | | | | | | | | |
Collapse
|
28
|
Ma WW, Hou CC, Zhou X, Yu HL, Xi YD, Ding J, Zhao X, Xiao R. Genistein alleviates the mitochondria-targeted DNA damage induced by β-amyloid peptides 25–35 in C6 glioma cells. Neurochem Res 2013; 38:1315-23. [DOI: 10.1007/s11064-013-1019-y] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2012] [Revised: 03/07/2013] [Accepted: 03/12/2013] [Indexed: 12/21/2022]
|
29
|
Zhong Y, Hu Y, Peng W, Sun Y, Yang Y, Zhao X, Huang X, Zhang H, Kong W. Age-related decline of the cytochrome c oxidase subunit expression in the auditory cortex of the mimetic aging rat model associated with the common deletion. Hear Res 2012; 294:40-8. [DOI: 10.1016/j.heares.2012.09.006] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/11/2012] [Revised: 08/15/2012] [Accepted: 09/20/2012] [Indexed: 01/23/2023]
|
30
|
Wu L, Sun Y, Hu YJ, Yang Y, Yao LL, Zhou XX, Wang H, Zhang R, Huang X, Kong WJ. Increased p66Shc in the inner ear of D-galactose-induced aging mice with accumulation of mitochondrial DNA 3873-bp deletion: p66Shc and mtDNA damage in the inner ear during aging. PLoS One 2012; 7:e50483. [PMID: 23209752 PMCID: PMC3507679 DOI: 10.1371/journal.pone.0050483] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2012] [Accepted: 10/22/2012] [Indexed: 12/28/2022] Open
Abstract
Aging has been associated with mitochondrial DNA damage. P66Shc is an age-related adaptor protein that has a substantial impact on mitochondrial metabolism through regulation of the cellular response to oxidative stress. Our study aimed to establish a D-galactose (D-gal)-induced inner ear aging mouse model and to investigate the potential role of p66Shc and its serine 36-phosphorylated form in the inner ear during aging by using this model. Real-time PCR was performed to detect the mtDNA 3873-bp deletion and the level of p66Shc mRNA in the cochlear lateral wall. Western blot analysis was performed to analyze the total and mitochondrial protein levels of p66Shc and the level of Ser36-P-p66Shc in the cochlear lateral wall. Immunofluoresence was performed to detect the location of the Ser36-P-p66Shc expression in the cochlear lateral wall. The results showed that the accumulation of the mtDNA 3873-bp deletion, total and mitochondrial protein levels of p66Shc and level of Ser36-P-p66Shc were significantly increased in the cochlear lateral wall of the D-gal-treated group when compared to the control group and that Ser36-P-p66Shc was mainly localized in the cytoplasm of the cells in the stria vascularis. During aging, the oxidative stress-related increase of p66Shc and Ser36-P-p66Shc might be associated with the accumulation of the mtDNA 3873-bp deletion in the inner ear.
Collapse
Affiliation(s)
- Lisa Wu
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People’s Republic of China
- Department of Otolaryngology-Head and Neck Surgery, Xiangya Hospital, Central South University, Changsha, People’s Republic of China
| | - Yu Sun
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People’s Republic of China
| | - Yu-Juan Hu
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People’s Republic of China
| | - Yang Yang
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People’s Republic of China
| | - Ling-Li Yao
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People’s Republic of China
| | - Xing-Xing Zhou
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People’s Republic of China
| | - Hao Wang
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People’s Republic of China
| | - Rui Zhang
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People’s Republic of China
| | - Xiang Huang
- Institute of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People’s Republic of China
| | - Wei-Jia Kong
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People’s Republic of China
- Institute of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, People’s Republic of China
- Key laboratory of Neurological Disease, Ministry of Education, Wuhan, People’s Republic of China
- * E-mail:
| |
Collapse
|
31
|
Du Z, Hu Y, Yang Y, Sun Y, Zhang S, Zhou T, Zeng L, Zhang W, Huang X, Kong W, Zhang H. NADPH oxidase-dependent oxidative stress and mitochondrial damage in hippocampus of D-galactose-induced aging rats. ACTA ACUST UNITED AC 2012; 32:466-472. [PMID: 22886955 DOI: 10.1007/s11596-012-0081-z] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2012] [Indexed: 12/20/2022]
Abstract
Mitochondrial DNA (mtDNA) common deletion (CD) plays a significant role in aging and age-related diseases. In this study, we used D-galactose (D-gal) to generate an animal model of aging and the involvement and causative mechanisms of mitochondrial damage in such a model were investigated. Twenty 5-week-old male Sprague-Dawley rats were randomly divided into two groups: D-gal group (n=10) and control group (n=10). The quantity of the mtDNA CD in the hippocampus was determined using a TaqMan real-time PCR assay. Transmission electron microscopy was used to observe the mitochondrial ultrastructure in the hippocampus. Western blot was used to detect the protein levels of NADPH oxidase (NOX) and uncoupling protein 2 (UCP2). We found that the level of mtDNA CD was significantly higher in the hippocampus of D-gal-induced aging rats than in control rats. In comparison with the control group, the mitochondrial ultrastructure in the hippocampus of D-gal-treated rats was damaged, and the protein levels of NOX and UCP2 were significantly increased in the hippocampus of D-gal-induced aging rats. This study demonstrated that the levels of mtDNA CD and NOX protein expression were significantly increased in the hippocampus of D-gal-induced aging rats. These findings indicate that NOX-dependent reactive oxygen species generation may contribute to D-gal-induced mitochondrial damage.
Collapse
Affiliation(s)
- Zhengde Du
- Department of Otorhinolaryngology, Huazhong University of Science and Technology, Wuhan, 430022, China.,Department of Otorhinolaryngology, Shenzhen Sixth People's Hospital (Nanshan Hospital), Huazhong University of Science and Technology, Shenzhen, 518052, China
| | - Yujuan Hu
- Department of Otorhinolaryngology, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Yang Yang
- Department of Otorhinolaryngology, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Yu Sun
- Department of Otorhinolaryngology, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Sulin Zhang
- Department of Otorhinolaryngology, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Tao Zhou
- Department of Otorhinolaryngology, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Lingling Zeng
- Department of Otorhinolaryngology, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Wenjuan Zhang
- Department of Otorhinolaryngology, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Xiang Huang
- Department of Otorhinolaryngology, Huazhong University of Science and Technology, Wuhan, 430022, China
| | - Weijia Kong
- Department of Otorhinolaryngology, Huazhong University of Science and Technology, Wuhan, 430022, China.
| | - Honglian Zhang
- Department of Public Health, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, 430022, China.
| |
Collapse
|
32
|
Du Z, Yang Y, Hu Y, Sun Y, Zhang S, Peng W, Zhong Y, Huang X, Kong W. A long-term high-fat diet increases oxidative stress, mitochondrial damage and apoptosis in the inner ear of d-galactose-induced aging rats. Hear Res 2012; 287:15-24. [DOI: 10.1016/j.heares.2012.04.012] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/02/2012] [Revised: 03/19/2012] [Accepted: 04/12/2012] [Indexed: 12/17/2022]
|
33
|
Zhong Y, Hu YJ, Chen B, Peng W, Sun Y, Yang Y, Zhao XY, Fan GR, Huang X, Kong WJ. Mitochondrial transcription factor A overexpression and base excision repair deficiency in the inner ear of rats with D-galactose-induced aging. FEBS J 2011; 278:2500-10. [PMID: 21575134 DOI: 10.1111/j.1742-4658.2011.08176.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Oxidative damage to mtDNA is associated with excessive reactive oxygen species production. The mitochondrial common deletion (mtDNA 4977-bp and 4834-bp deletion in humans and rats, respectively) is the most typical and frequent form of mtDNA damage associated with aging and degenerative diseases. The accumulation of the mitochondrial common deletion has been proposed to play a crucial role in age-related hearing loss (presbycusis). However, the mechanisms underlying the formation and accumulation of mtDNA deletions are still obscure. In the present study, a rat mimetic aging model induced by D-Gal was used to explore the origin of deletion mutations and how mtDNA repair systems modulate this process in the inner ear during aging. We found that the mitochondrial common deletion was greatly increased and mitochondrial base excision repair capacity was significantly reduced in the inner ear in D-Gal-treated rats as compared with controls. The overexpression of mitochondrial transcription factor A induced by D-Gal significantly stimulated mtDNA replication, resulting in an increase in mtDNA copy number. In addition, an age-related loss of auditory sensory cells in the inner ear was observed in D-Gal-treated rats. Taken together, our data suggest that mitochondrial base excision repair capacity deficiency and an increase in mtDNA replication resulting from mitochondrial transcription factor A overexpression may contribute to the accumulation of mtDNA deletions in the inner ear during aging. This study also provides new insights into the development of presbycusis.
Collapse
Affiliation(s)
- Yi Zhong
- Department of Otorhinolaryngology, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan, China
| | | | | | | | | | | | | | | | | | | |
Collapse
|