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Ma T, Liu W, Jiang D, Zhang G, Zhao X, Zhang Y, Li Z. Analysis of Toxic Effects of Fluoride on Ovine Follicular Granulosa Cells Using RNA-Seq. Antioxidants (Basel) 2024; 13:506. [PMID: 38790611 PMCID: PMC11118050 DOI: 10.3390/antiox13050506] [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: 04/02/2024] [Revised: 04/20/2024] [Accepted: 04/22/2024] [Indexed: 05/26/2024] Open
Abstract
Fluoride is abundant in the environment and is an essential trace element in living organisms. However, prolonged excessive fluoride intake can lead to fluorosis, which poses a threat to the reproductive health of animals and humans. Although previous research has mainly focused on animal models, the impact of fluoride on ovine follicular granulosa cells (GCs) has not been comprehensively elucidated. This study employed RNA-Seq technology to elucidate the toxic effects of fluoride on ovine follicular GCs and its mechanism of action. Culturing primary ovine follicular GCs in vitro and subjecting them to fluoride treatment revealed 3218 differentially expressed genes (DEGs), with 2278 upregulated and 940 downregulated. Significantly, this study unveiled fluoride's induction of endoplasmic reticulum (ER) stress in cells, triggering a cascade involving the PERK pathway factor ATF4, leading to cell death via DDIT3/CHOP activation and the subsequent upregulation of CHAC1, ATF3, ERO1α, and TRIB3. These findings provide crucial insights into the toxicity of fluoride in ovine, offering a foundation for mitigating fluoride-related losses in the farming industry.
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Affiliation(s)
- Tian Ma
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China; (T.M.); (W.L.); (D.J.); (G.Z.); (X.Z.)
| | - Wanruo Liu
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China; (T.M.); (W.L.); (D.J.); (G.Z.); (X.Z.)
| | - Didi Jiang
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China; (T.M.); (W.L.); (D.J.); (G.Z.); (X.Z.)
| | - Guolin Zhang
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China; (T.M.); (W.L.); (D.J.); (G.Z.); (X.Z.)
| | - Xingxu Zhao
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China; (T.M.); (W.L.); (D.J.); (G.Z.); (X.Z.)
| | - Yong Zhang
- College of Veterinary Medicine, Gansu Agricultural University, Lanzhou 730070, China; (T.M.); (W.L.); (D.J.); (G.Z.); (X.Z.)
| | - Zongshuai Li
- Key Laboratory of Education, College of Pastoral Agriculture Science and Technology, Lanzhou University, Lanzhou 730020, China
- State Key Laboratory of Grassland Agro Ecosystems, Lanzhou University, Lanzhou 730020, China
- Key Laboratory of Grassland Livestock Industry Innovation, Lanzhou University, Lanzhou 730020, China
- Key Laboratory of Agriculture and Rural Affairs, Grassland Agriculture Engineering Center, Lanzhou University, Lanzhou 730020, China
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Dong Y, Sun X, He W, Xiang J, Qi X, Hong W, He Y, Guan Z. Elevated Level of PINK1/Parkin-Mediated Mitophagy Pathway Involved to the Inhibited Activity of Mitochondrial Superoxide Dismutase in Rat Brains and Primary Hippocampal Neurons Exposed to High Level of Fluoride. Biol Trace Elem Res 2024; 202:538-547. [PMID: 37193858 DOI: 10.1007/s12011-023-03681-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Accepted: 04/22/2023] [Indexed: 05/18/2023]
Abstract
To reveal the molecular mechanism of brain damage induced by chronic fluorosis, expression of PTEN-induced kinase 1 (PINK1)/parkin RBR E3 ubiquitin-protein ligase (Parkin)-mediated mitophagy pathway and activity of mitochondrial superoxide dismutase (SOD) were investigated in rat brains and primary cultured neurons exposed to high level of fluoride. Sprague-Dawley (SD) rats were treated with fluoride (0, 5, 50, and 100 ppm) for 3 and 6 months. The primary neurons were exposed to 0.4 mM (7.6 ppm) fluoride and thereafter treated with 100 nM rapamycin (a stimulator of mitophagy) or 50 μM 3-methyladenine (3-MA, an inhibitor of mitophagy) for 24 h. The expressions of PINK1/Parkin at the protein level and the activity of SOD in mitochondria of rat brains and cultured neurons were determined by Western blotting and biochemical method, respectively. The results showed that the rats exposed to fluoride exhibited different degrees of dental fluorosis. In comparison to controls, the expressions of PINK1 and Parkin were significantly higher in the rat brains and primary neurons exposed to high fluoride. In addition, a declined activity of mitochondrial SOD was determined. Interestingly, rapamycin treatment enhanced but 3-MA inhibited the changes of PINK1/Parkin pathway and SOD activity, and the correlations between the inhibited SOD activity and the elevated PINK1/Parkin proteins were observed. The results suggest that the inhibition of mitochondrial SOD activity induced by fluorosis may stimulate the expressions of mitophagy (PINK1/ Parkin) pathway to maintain the mitochondrial homeostasis.
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Affiliation(s)
- Yangting Dong
- Key Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of Education and Provincial Key Laboratory of Medical Molecular Biology, Guiyang, 550004, People's Republic of China
- Department of Pathology at the Affiliated Hospital of Guizhou Medical University, Guiyang, 550004, People's Republic of China
| | - Xiufen Sun
- Key Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of Education and Provincial Key Laboratory of Medical Molecular Biology, Guiyang, 550004, People's Republic of China
| | - Wenwen He
- Key Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of Education and Provincial Key Laboratory of Medical Molecular Biology, Guiyang, 550004, People's Republic of China
- Department of Pathology at the Affiliated Hospital of Guizhou Medical University, Guiyang, 550004, People's Republic of China
| | - Jie Xiang
- Department of Pathology at the Affiliated Hospital of Guizhou Medical University, Guiyang, 550004, People's Republic of China
| | - Xiaolan Qi
- Key Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of Education and Provincial Key Laboratory of Medical Molecular Biology, Guiyang, 550004, People's Republic of China
| | - Wei Hong
- Key Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of Education and Provincial Key Laboratory of Medical Molecular Biology, Guiyang, 550004, People's Republic of China
| | - Yan He
- Key Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of Education and Provincial Key Laboratory of Medical Molecular Biology, Guiyang, 550004, People's Republic of China
| | - Zhizhong Guan
- Key Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of Education and Provincial Key Laboratory of Medical Molecular Biology, Guiyang, 550004, People's Republic of China.
- Department of Pathology at the Affiliated Hospital of Guizhou Medical University, Guiyang, 550004, People's Republic of China.
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Li Y, Zhang M, Mi W, Ji L, He Q, Xie S, Xiao C, Bi Y. Spatial distribution of groundwater fluoride and arsenic and its related disease in typical drinking endemic regions. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 906:167716. [PMID: 37820791 DOI: 10.1016/j.scitotenv.2023.167716] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/06/2023] [Revised: 08/22/2023] [Accepted: 10/08/2023] [Indexed: 10/13/2023]
Abstract
c exposure to geogenic fluoride and arsenic iChronic exposure to geogenic fluoride and arsenic in groundwater has a deleterious influence on the health of billions of people globally. The health status of residents impacted by connected diseases is urgently needed. A twelve-year study was carried out to identify the spatial distribution pattern of high fluoride/arsenic groundwater in an arid/semi-arid area and to estimate the population exposed to related disease. A geostatistical interpolation method and a disease inversion model were used. The results indicated that fluoride/arsenic-rich groundwater primarily accumulated in basins of Shanxi Province. Groundwater fluoride exposure provided a health concern to 3.16 million persons (9.08 % of the population), including 2.50 million children at risk of dental caries. Exposure to groundwater arsenic caused a health risk to 4.38 million inhabitants (12.58 % of total), with 1.92 million at risk of lung cancer, 1.87 million at risk of bladder cancer, and 0.29 million at risk of skin cancer, respectively. The pollution and impact of groundwater fluoride and arsenic vary greatly among residents in different environments, and accurate assessment of the affected population is of great significance for residents' health and water quality management. Our research study complements the critical data on the disease risks associated with geogenic-contaminated groundwater and provides scientific basis of water quality management for policy makers.
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Affiliation(s)
- Yuan Li
- School of Environment and Resources, Taiyuan University of Science and Technology, Taiyuan 030024, China; State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Minghua Zhang
- School of Environment and Resources, Taiyuan University of Science and Technology, Taiyuan 030024, China
| | - Wujuan Mi
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Li Ji
- School of Environment and Resources, Taiyuan University of Science and Technology, Taiyuan 030024, China
| | - Qiusheng He
- Institute of Intelligent Low Carbon and Control Technology, Taiyuan University of Science and Technology, Taiyuan 030024, China; Shanxi Polytechnic College, Taiyuan 030006, China
| | - Shulian Xie
- School of Life Science, Shanxi University, Taiyuan 030006, China
| | - Chen Xiao
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China
| | - Yonghong Bi
- State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, China.
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Ran L, Xiang J, Zeng X, He W, Dong Y, Yu W, Qi X, Xiao Y, Cao K, Zou J, Guan Z. The influence of NQO2 on the dysfunctional autophagy and oxidative stress induced in the hippocampus of rats and in SH-SY5Y cells by fluoride. CNS Neurosci Ther 2023; 29:1129-1141. [PMID: 36650666 PMCID: PMC10018107 DOI: 10.1111/cns.14090] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 12/24/2022] [Accepted: 12/29/2022] [Indexed: 01/19/2023] Open
Abstract
INTRODUCTION For investigating the mechanism of brain injury caused by chronic fluorosis, this study was designed to determine whether NRH:quinone oxidoreductase 2 (NQO2) can influence autophagic disruption and oxidative stress induced in the central nervous system exposed to a high level of fluoride. METHODS Sprague-Dawley rats drank tap water containing different concentrations of fluoride for 3 or 6 months. SH-SY5Y cells were either transfected with NQO2 RNA interference or treated with NQO2 inhibitor or activator and at the same time exposed to fluoride. The enrichment of gene signaling pathways related to autophagy was evaluated by Gene Set Enrichment Analysis; expressions of NQO2 and autophagy-related protein 5 (ATG5), LC3-II and p62, and mammalian target of rapamycin (mTOR) were quantified by Western-blotting or fluorescent staining; and the levels of malondialdehyde (MDA) and superoxide dismutase (SOD) assayed biochemically and reactive oxygen species (ROS) detected by flow cytometry. RESULTS In the hippocampal CA3 region of rats exposed to high fluoride, the morphological characteristics of neurons were altered; the numbers of autophagosomes in the cytoplasm and the levels of NQO2 increased; the level of p-mTOR was decreased, and the levels of ATG5, LC3-II and p62 were elevated; and genes related to autophagy enriched. In vitro, in addition to similar changes in NQO2, p-mTOR, ATG5, LC3 II, and p62, exposure of SH-SY5Y cells to fluoride enhanced MDA and ROS contents and reduced SOD activity. Inhibition of NQO2 with RNAi or an inhibitor attenuated the disturbance of the autophagic flux and enhanced oxidative stress in these cells exposed to high fluoride. CONCLUSION Our findings indicate that NQO2 may be involved in regulating autophagy and oxidative stress and thereby exerts an impact on brain injury caused by chronic fluorosis.
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Affiliation(s)
- Long‐Yan Ran
- Department of Pathology at the Affiliated Hospital of Guizhou Medical UniversityKey Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of EducationGuiyangChina
- Department of Medical Science and TechnologyGuiyang Healthcare Vocational UniversityGuiyangChina
| | - Jie Xiang
- Department of Pathology at the Affiliated Hospital of Guizhou Medical UniversityKey Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of EducationGuiyangChina
| | - Xiao‐Xiao Zeng
- Department of Pathology at the Affiliated Hospital of Guizhou Medical UniversityKey Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of EducationGuiyangChina
| | - Wen‐Wen He
- Department of Pathology at the Affiliated Hospital of Guizhou Medical UniversityKey Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of EducationGuiyangChina
| | - Yang‐Ting Dong
- Key Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of Education and Provincial Key Laboratory of Medical Molecular BiologyGuiyangChina
| | - Wen‐Feng Yu
- Key Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of Education and Provincial Key Laboratory of Medical Molecular BiologyGuiyangChina
| | - Xiao‐Lan Qi
- Key Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of Education and Provincial Key Laboratory of Medical Molecular BiologyGuiyangChina
| | - Yan Xiao
- Key Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of Education and Provincial Key Laboratory of Medical Molecular BiologyGuiyangChina
| | - Kun Cao
- Department of Hepatobiliary SurgeryAffiliated Hospital to Guizhou Medical UniversityGuiyangChina
| | - Jian Zou
- Department of Pathology at the Affiliated Hospital of Guizhou Medical UniversityKey Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of EducationGuiyangChina
| | - Zhi‐Zhong Guan
- Department of Pathology at the Affiliated Hospital of Guizhou Medical UniversityKey Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of EducationGuiyangChina
- Key Laboratory of Endemic and Ethnic Diseases (Guizhou Medical University) of the Ministry of Education and Provincial Key Laboratory of Medical Molecular BiologyGuiyangChina
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Zhou J, Sun D, Wei W. Necessity to Pay Attention to the Effects of Low Fluoride on Human Health: an Overview of Skeletal and Non-skeletal Damages in Epidemiologic Investigations and Laboratory Studies. Biol Trace Elem Res 2023; 201:1627-1638. [PMID: 35661326 DOI: 10.1007/s12011-022-03302-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/25/2022] [Accepted: 05/26/2022] [Indexed: 12/15/2022]
Abstract
Due to the implementation of water improvement and fluoride reduction plans supported by central and local governments in recent years, areas with high fluoride exposure are being gradually decreased. Therefore, it is of practical importance to study the effect of low fluoride on human health. Epidemiologic investigations and in vivo and in vitro studies based on low fluoride have also confirmed that fluoride not only causes skeletal damage, such as dental fluorosis, but also causes non-skeletal damage involving the cardiovascular system, nervous system, hepatic and renal function, reproductive system, thyroid function, blood glucose homeostasis, and the immune system. This article summarizes the effects of low fluoride on human and animal skeletal and non-skeletal systems. A preliminary exploration of corresponding mechanisms that will help to fully understand the harm of low fluoride on human health was undertaken to provide the basis for establishing new water fluoride standards and help to implement individual guidance.
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Affiliation(s)
- Jing Zhou
- Center for Endemic Disease Control, Chinese Center for Disease Control and Prevention, Harbin Medical University, Harbin, 150081, Heilongjiang Province, China
- National Health Commission, Key Laboratory of Etiology and Epidemiology, Harbin Medical University (23618504), Harbin, 150081, Heilongjiang Province, China
- Heilongjiang Provincial Key Laboratory of Trace Elements and Human Health, Harbin Medical University, 150081, Harbin, Heilongjiang Province, China
| | - Dianjun Sun
- Center for Endemic Disease Control, Chinese Center for Disease Control and Prevention, Harbin Medical University, Harbin, 150081, Heilongjiang Province, China
- National Health Commission, Key Laboratory of Etiology and Epidemiology, Harbin Medical University (23618504), Harbin, 150081, Heilongjiang Province, China
- Heilongjiang Provincial Key Laboratory of Trace Elements and Human Health, Harbin Medical University, 150081, Harbin, Heilongjiang Province, China
| | - Wei Wei
- Center for Endemic Disease Control, Chinese Center for Disease Control and Prevention, Harbin Medical University, Harbin, 150081, Heilongjiang Province, China.
- National Health Commission, Key Laboratory of Etiology and Epidemiology, Harbin Medical University (23618504), Harbin, 150081, Heilongjiang Province, China.
- Heilongjiang Provincial Key Laboratory of Trace Elements and Human Health, Harbin Medical University, 150081, Harbin, Heilongjiang Province, China.
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Regeneration Analysis of Bone Char Used in Water Defluoridation: Chemical Desorption Route, Surface Chemistry Analysis and Modeling. INTERNATIONAL JOURNAL OF CHEMICAL ENGINEERING 2023. [DOI: 10.1155/2023/8378162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/08/2023]
Abstract
High concentrations of fluoride (F−) in drinking water represent a public health threat, and consequently, effective and sustainable methods are required to improve the water quality, mainly in developing and low-income countries. This study focused on the thermodynamics of fluoride adsorption on bone char regenerated with NaOH for water defluoridation. A detailed analysis of the number of fluoride adsorption/desorption cycles, their impact on the performance and surface chemistry of bone char using different NaOH concentrations, and modeling of the adsorption mechanism using statistical physics theory was carried out. The results showed that 0.075 mol/L NaOH was effective in recuperating the defluoridation properties of bone char with a regeneration efficiency higher than 90% during five adsorption/desorption cycles. Bone char regeneration efficiency decreased up to 64% after ten adsorption/desorption cycles with a maximum fluoride adsorption capacity of 0.18 mmol/g. NaOH restored the bone char surface properties for ligand exchange of the fluoride anions via the hydroxyapatite functionalities contained in this adsorbent. It was calculated that around 0.25–0.46 mmol/g hydroxyapatite ligand exchange sites of regenerated bone char samples could be involved in the fluoride adsorption, which was also expected to be a mono-ligand mechanism. The reduction in defluoridation properties of bone char during the regeneration cycles was attributed to the decrease in the ligand exchange capacity as well as the deactivation and blocking of some functional groups of hydroxyapatite, which limited their participation in consecutive adsorption processes. This study contributes to the optimization of the recycling and reuse of bone char for fluoride removal from water to reduce the operating defluoridation costs, thus enhancing the application of this technology in low-income areas where fluorinated water represents a threat to public health.
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Fluoride in the Central Nervous System and Its Potential Influence on the Development and Invasiveness of Brain Tumours-A Research Hypothesis. Int J Mol Sci 2023; 24:ijms24021558. [PMID: 36675073 PMCID: PMC9866357 DOI: 10.3390/ijms24021558] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2022] [Revised: 01/09/2023] [Accepted: 01/10/2023] [Indexed: 01/15/2023] Open
Abstract
The purpose of this review is to attempt to outline the potential role of fluoride in the pathogenesis of brain tumours, including glioblastoma (GBM). In this paper, we show for the first time that fluoride can potentially affect the generally accepted signalling pathways implicated in the formation and clinical course of GBM. Fluorine compounds easily cross the blood-brain barrier. Enhanced oxidative stress, disruption of multiple cellular pathways, and microglial activation are just a few examples of recent reports on the role of fluoride in the central nervous system (CNS). We sought to present the key mechanisms underlying the development and invasiveness of GBM, as well as evidence on the current state of knowledge about the pleiotropic, direct, or indirect involvement of fluoride in the regulation of these mechanisms in various tissues, including neural and tumour tissue. The effects of fluoride on the human body are still a matter of controversy. However, given the growing incidence of brain tumours, especially in children, and numerous reports on the effects of fluoride on the CNS, it is worth taking a closer look at these mechanisms in the context of brain tumours, including gliomas.
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Wei H, Yi M, Li X, Shao L, Gao F, Cui X, Wang K. Preparation of Metakaolin-Based Geopolymer Microspheres (MK@GMs) and Efficient Adsorption of F- from Acidic Wastewater. Sep Purif Technol 2023. [DOI: 10.1016/j.seppur.2023.123159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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Xu W, Hu Z, Tang Y, Zhang J, Xu S, Niu Q. Excessive Lysosomal Stress Response and Consequently Impaired Autophagy Contribute to Fluoride-Induced Developmental Neurotoxicity. Biol Trace Elem Res 2022:10.1007/s12011-022-03511-0. [PMID: 36464725 DOI: 10.1007/s12011-022-03511-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Accepted: 11/27/2022] [Indexed: 12/11/2022]
Abstract
Fluoride can cause developmental neurotoxicity; however, the precise mechanism has yet to be determined. We aimed to explore the possible role and mechanism of fluoride-induced developmental neurotoxicity, specifically the significance of the lysosomal stress response. As an in vivo model, Sprague Dawley rats were exposed to sodium fluoride (NaF) from embryo to 2 months of age. We found that NaF caused autophagic flux blockage and apoptosis in the rat hippocampus. These results were validated in human neuroblastoma (SH-SY5Y) cells in vitro. In addition, in SH-SY5Y cells, NaF hindered autophagosome-lysosome fusion, decreased lysosomal degradation, and elevated lysosomal pH, which is the most prominent hallmark of a lysosomal stress response. Interestingly, rapamycin promoted autophagosome-lysosome fusion, effectively restoring autophagic flux and reducing apoptosis. Notably, bafilomycin A1, a lysosomal lumen alkalizer, unsurprisingly exacerbated the NaF-induced increase in lysosomal pH and decreased lysosomal degradability, as well as enhanced apoptosis of SH-SY5Y cells. In conclusion, our results suggest that NaF exposure initiates excessive lysosomal stress response, resulting in elevated lysosomal pH, decreased lysosomal degradation, and blocked autophagic flux, which leads to neuronal apoptosis. Thus, the lysosomal stress response may be a promising target for the prevention and treatment of fluoride-induced developmental neurotoxicity.
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Affiliation(s)
- Wanjing Xu
- Department of Preventive Medicine, School of Medicine, Shihezi University, North 2nd Road, Shihezi, Xinjiang, 832000, People's Republic of China
- Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China
- Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China
- NHC Key Laboratory of Prevention and Treatment of Central Asia High Incidence Diseases (First Affiliated Hospital, School of Medicine, Shihezi University), Shihezi, China
| | - Zeyu Hu
- Department of Preventive Medicine, School of Medicine, Shihezi University, North 2nd Road, Shihezi, Xinjiang, 832000, People's Republic of China
- Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China
- Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China
- NHC Key Laboratory of Prevention and Treatment of Central Asia High Incidence Diseases (First Affiliated Hospital, School of Medicine, Shihezi University), Shihezi, China
| | - Yanling Tang
- Department of Preventive Medicine, School of Medicine, Shihezi University, North 2nd Road, Shihezi, Xinjiang, 832000, People's Republic of China
- Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China
- Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China
- NHC Key Laboratory of Prevention and Treatment of Central Asia High Incidence Diseases (First Affiliated Hospital, School of Medicine, Shihezi University), Shihezi, China
| | - Jingjing Zhang
- Department of Preventive Medicine, School of Medicine, Shihezi University, North 2nd Road, Shihezi, Xinjiang, 832000, People's Republic of China
- Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China
- Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China
- NHC Key Laboratory of Prevention and Treatment of Central Asia High Incidence Diseases (First Affiliated Hospital, School of Medicine, Shihezi University), Shihezi, China
| | - Shangzhi Xu
- Department of Preventive Medicine, School of Medicine, Shihezi University, North 2nd Road, Shihezi, Xinjiang, 832000, People's Republic of China.
- Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China.
- Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China.
- NHC Key Laboratory of Prevention and Treatment of Central Asia High Incidence Diseases (First Affiliated Hospital, School of Medicine, Shihezi University), Shihezi, China.
| | - Qiang Niu
- Department of Preventive Medicine, School of Medicine, Shihezi University, North 2nd Road, Shihezi, Xinjiang, 832000, People's Republic of China.
- Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China.
- Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China.
- NHC Key Laboratory of Prevention and Treatment of Central Asia High Incidence Diseases (First Affiliated Hospital, School of Medicine, Shihezi University), Shihezi, China.
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Zhao Q, Pan W, Li J, Yu S, Liu Y, Zhang X, Qu R, Zhang Q, Li B, Yan X, Ren X, Qiu Y. Effects of neuron autophagy induced by arsenic and fluoride on spatial learning and memory in offspring rats. CHEMOSPHERE 2022; 308:136341. [PMID: 36087721 DOI: 10.1016/j.chemosphere.2022.136341] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/20/2022] [Revised: 08/25/2022] [Accepted: 09/02/2022] [Indexed: 06/15/2023]
Abstract
There are numerous studies showing that exposure to arsenic (As) or fluoride (F) damages the nervous system, but there is no literature investigating the effects of combined As and F exposure to induce autophagy on neurotoxicity in the offspring. In this study, we developed a rat model of As and/or F exposure through drinking water from before pregnancy to 90 days postnatal. The offspring rats were randomly divided into nine groups. Sodium arsenite (NaAsO2) (0, 35, 70 mg/L) and Sodium fluoride (NaF) (0, 50, 100 mg/L) were designed according to 3 × 3 factorial design. Our results suggested that the presence of F might antagonize the excretion of total As in urine, and As-F co-exposure led to severe pathological damage in brain tissue and reduced spatial learning and memory ability. At the same time, the experiments showed that As and F increased Beclin1 expression and LC3B ratio to activate autophagy; both P62 and Lamp2 expression were increased, suggesting that autophagy lysosomal degradation was blocked; SYN and JIP1 expression were significantly decreased, disrupting synaptic structure and function. Axonal autophagosome reverse transport regulation might be affected by combined As-F exposure, exacerbating neuronal synaptic damage and inducing neurotoxicity. Further analysis showed that there was an interaction between As and F exposure-induced changes in autolysosome-related proteins in the hippocampus, which showed antagonism, and the antagonism of the high As combined exposure groups were stronger than that of the low As combined exposure groups. In conclusion, our study showed that combined As and F exposure might induce reverse transport impairment of autophagy on axons, leading to autophagy defects, which in turn led to disruption of synaptic morphology and function, induced neurotoxicity, and there was an interaction between As and F, the type of its combined effect was antagonism.
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Affiliation(s)
- Qiuyi Zhao
- Department of Toxicology, School of Public Health, Shanxi Medical University, Taiyuan, China.
| | - Weizhe Pan
- Department of Toxicology, School of Public Health, Shanxi Medical University, Taiyuan, China.
| | - Jia Li
- Department of Toxicology, School of Public Health, Shanxi Medical University, Taiyuan, China.
| | - Shengnan Yu
- Department of Toxicology, School of Public Health, Shanxi Medical University, Taiyuan, China.
| | - Yan Liu
- Department of Toxicology, School of Public Health, Shanxi Medical University, Taiyuan, China.
| | - Xiaoli Zhang
- Department of Toxicology, School of Public Health, Shanxi Medical University, Taiyuan, China; Department of Microbiology Laboratory, Linfen Central Hospital, Linfen, China.
| | - Ruodi Qu
- Department of Toxicology, School of Public Health, Shanxi Medical University, Taiyuan, China.
| | - Qian Zhang
- Department of Toxicology, School of Public Health, Shanxi Medical University, Taiyuan, China.
| | - Ben Li
- Department of Toxicology, School of Public Health, Shanxi Medical University, Taiyuan, China.
| | - Xiaoyan Yan
- Department of Toxicology, School of Public Health, Shanxi Medical University, Taiyuan, China.
| | - Xuefeng Ren
- Department of Epidemiology and Environmental Health, School of Public Health and Health Professions, University at Buffalo, Buffalo, NY, USA; Department of Pharmacology and Toxicology, Jacobs School of Medicine and Biomedical Sciences, University at Buffalo, Buffalo, NY, USA.
| | - Yulan Qiu
- Department of Toxicology, School of Public Health, Shanxi Medical University, Taiyuan, China.
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11
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Danziger J, Dodge LE, Hu H. Role of renal function in the association of drinking water fluoride and plasma fluoride among adolescents in the United States: NHANES, 2013-2016. ENVIRONMENTAL RESEARCH 2022; 213:113603. [PMID: 35688217 DOI: 10.1016/j.envres.2022.113603] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2021] [Revised: 05/26/2022] [Accepted: 05/31/2022] [Indexed: 06/15/2023]
Abstract
CONTEXT While fluoride has been added to drinking water and dental products for decades in order to prevent tooth decay, there are growing concerns about its potential toxicity. Given that fluoride is primarily excreted in urine, an important question that has not been examined is whether among those whose drinking water is fluoridated, impaired renal function is associated with higher levels of circulating fluoride. OBJECTIVE To examine the association between drinking water and plasma fluoride and its modification by renal function. DESIGN, SETTING, AND PARTICIPANTS Participants in the National Health and Nutrition Examination Survey (NHANES) between 2013 and 2016 with measures of fluoride in plasma and drinking water and renal function. These measures were only available in adolescent age 12-19 years. OUTCOMES Plasma fluoride levels and their modification by strata of renal function, measured by the estimated glomerular filtration rate (eGFR). RESULTS Among 1841 healthy adolescents, a 10 ml/min/1.73 m (Penman et al., 1997) lower eGFR and a 1 mg/L higher drinking water fluoride concentration were associated with a 0.02 (95%CI -0.02, -0.03) umol/L and 0.23 (95%CI 0.15,0.30) umol/L higher adjusted plasma fluoride level, respectively. The association of water and plasma fluoride levels was most robust among those with lower renal function (multiplicative interaction p value < 0.001). For adolescents in the lowest eGFR quartile, a 1 mg/L higher drinking water fluoride concentration was associated with a 0.35 (95%CI 0.21,0.48) umol/L higher plasma fluoride level, compared to 0.20 (95%CI 0.14,0.26) umol/L in the highest eGFR quartile. Restriction to those with measurable plasma fluoride levels yielded similar results. CONCLUSIONS Water fluoridation results in higher plasma fluoride levels in those with lower renal function. How routine water fluoridation may affect the many millions of Americans with Chronic Kidney Disease, who are particularly susceptible to heavy metal and mineral accumulation, needs to be further investigated.
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Affiliation(s)
- John Danziger
- Department of Medicine, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA.
| | - Laura E Dodge
- Department of Obstetrics and Gynecology, Beth Israel Deaconess Medical Center, Harvard Medical School, Boston, MA, USA; Harvard T.H. Chan School of Public Health, Boston, MA, USA
| | - Howard Hu
- Department of Preventative Medicine, Keck School of Medicine, University of Southern California, USA
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12
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Wang D, Cao L, Zhou X, Wang G, Ma Y, Hao X, Fan H. Mitigation of honokiol on fluoride-induced mitochondrial oxidative stress, mitochondrial dysfunction, and cognitive deficits through activating AMPK/PGC-1α/Sirt3. JOURNAL OF HAZARDOUS MATERIALS 2022; 437:129381. [PMID: 35752048 DOI: 10.1016/j.jhazmat.2022.129381] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/24/2022] [Revised: 05/29/2022] [Accepted: 06/11/2022] [Indexed: 06/15/2023]
Abstract
Oxidative stress and mitochondrial dysfunction contribute greatly to fluoride-induced cognitive impairment and behavioural disorders. Honokiol, a natural biphenolic compound, possesses antioxidant and mitochondrial protective properties. The present study investigated the protective actions of honokiol on NaF-elicited cognitive deficits and elucidated the possible mechanism of honokiol-mediated protection. The results demonstrated that honokiol administration markedly attenuated fluoride-induced cognitive impairments and neural/synaptic injury in mice. Moreover, honokiol elevated the activity and expression of SOD2 and promoted mtROS scavenging through Sirt3 activation in NaF-treated mice and SH-SY5Y cell lines. Meanwhile, honokiol substantially lowered mtROS production by enhancing Sirt3-mediated mitochondrial DNA (mtDNA) transcription, thereby leading to significant increases in ATP synthesis and complex I activity. Further studies revealed that honokiol activated AMPK and upregulated the PGC-1α and Sirt3 protein expression in vivo and in vitro. Intriguingly, the protective actions of honokiol on oxidative stress and mitochondrial dysfunction were abolished by AMPK shRNA or Sirt3 shRNA. Notably, AMPK knockdown prevented the increase in PGC-1α and Sirt3 expression induced by honokiol, while Sirt3 shRNA suppressed Sirt3 signaling without significant effects on p-AMPK and PGC-1α expression. In conclusion, our findings indicate that honokiol mitigates NaF-induced oxidative stress and mitochondrial dysfunction by regulating mtROS homeostasis, partly via the AMPK/PGC-1α/Sirt3 pathway, which ultimately contributes to neuronal/synaptic injury and cognitive deficits.
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Affiliation(s)
- Dongmei Wang
- School of Basic Medical Sciences, Henan University of Science and Technology, Luoyang, China.
| | - Luyang Cao
- School of Basic Medical Sciences, Henan University of Science and Technology, Luoyang, China
| | - Xiang Zhou
- School of Basic Medical Sciences, Henan University of Science and Technology, Luoyang, China
| | - Gang Wang
- School of Basic Medical Sciences, Henan University of Science and Technology, Luoyang, China
| | - Yilu Ma
- School of Basic Medical Sciences, Henan University of Science and Technology, Luoyang, China
| | - Xueqin Hao
- School of Basic Medical Sciences, Henan University of Science and Technology, Luoyang, China
| | - Hua Fan
- Department of Neurology, First Affiliated Hospital of Henan University of Science and Technology, Luoyang, China.
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Do methylenetetrahydrofolate dehydrogenase, cyclohydrolase, and formyltetrahydrofolate synthetase 1 polymorphisms modify changes in intelligence of school-age children in areas of endemic fluorosis? Chin Med J (Engl) 2022; 135:1846-1854. [PMID: 35838408 PMCID: PMC9521762 DOI: 10.1097/cm9.0000000000002062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
BACKGROUND Excessive exposure to fluoride can reduce intelligence. Methylenetetrahydrofolate dehydrogenase, cyclohydrolase, and formyltetrahydrofolate synthetase 1 ( MTHFD1 ) polymorphisms have important roles in neurodevelopment. However, the association of MTHFD1 polymorphisms with children's intelligence changes in endemic fluorosis areas has been rarely explored. METHODS A cross-sectional study was conducted in four randomly selected primary schools in Tongxu County, Henan Province, from April to May in 2017. A total of 694 children aged 8 to 12 years were included in the study with the recruitment by the cluster sampling method. Urinary fluoride (UF) and urinary creatinine were separately determined using the fluoride ion-selective electrode and creatinine assay kit. Children were classified as the high fluoride group and control group according to the median of urinary creatinine-adjusted urinary fluoride (UF Cr ) level. Four loci of MTHFD1 were genotyped, and the Combined Raven's Test was used to evaluate children's intelligence quotient (IQ). Generalized linear model and multinomial logistic regression model were performed to analyze the associations between children's UF Cr level, MTHFD1 polymorphisms, and intelligence. The general linear model was used to explore the effects of gene-environment and gene-gene interaction on intelligence. RESULTS In the high fluoride group, children's IQ scores decreased by 2.502 when the UF Cr level increased by 1.0 mg/L (β = -2.502, 95% confidence interval [CI]:-4.411, -0.593), and the possibility for having "excellent" intelligence decreased by 46.3% (odds ratio = 0.537, 95% CI: 0.290, 0.994). Children with the GG genotype showed increased IQ scores than those with the AA genotype of rs11627387 locus in the high fluoride group ( P < 0.05). Interactions between fluoride exposure and MTHFD1 polymorphisms on intelligence were observed (Pinteraction < 0.05). CONCLUSION Our findings suggest that excessive fluoride exposure may have adverse effects on children's intelligence, and changes in children's intelligence may be associated with the interaction between fluoride and MTHFD1 polymorphisms.
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Han X, Tang Y, Zhang Y, Zhang J, Hu Z, Xu W, Xu S, Niu Q. Impaired V-ATPase leads to increased lysosomal pH, results in disrupted lysosomal degradation and autophagic flux blockage, contributes to fluoride-induced developmental neurotoxicity. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 236:113500. [PMID: 35421827 DOI: 10.1016/j.ecoenv.2022.113500] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 03/31/2022] [Accepted: 04/06/2022] [Indexed: 06/14/2023]
Abstract
Fluoride is capable of inducing developmental neurotoxicity, yet its mechanisms remain elusive. We aimed to explore the possible role and mechanism of autophagic flux blockage caused by abnormal lysosomal pH in fluoride-induced developmental neurotoxicity, focusing on the role of V-ATPase in regulating the neuronal lysosomal pH. Using Sprague-Dawley rats exposed to sodium fluoride (NaF) from gestation through delivery until the neonatal offspring reached six months of age as an in vivo model. The results showed that NaF impaired the cognitive abilities of the offspring rats. In addition, NaF reduced V-ATPase expression, diminished lysosomal degradation capacity and blocked autophagic flux, and increased apoptosis in the hippocampus of offspring. Consistently, these results were validated in SH-SY5Y cells incubated with NaF. Moreover, NaF increased the SH-SY5Y lysosomal pH. Mechanistically, V-ATPase B2 overexpression and ATP effectively restored V-ATPase expression, reducing NaF-induced lysosomal alkalinization while increasing lysosomal degradation capacity. Notably, those above pharmacological and molecular interventions diminished NaF-induced apoptosis by restoring autophagic flux. Collectively, the present findings suggested that NaF impairs the lysosomal pH raised by V-ATPase. This leads to reduced lysosomal degradation capacity and triggers autophagic flux blockage and apoptosis, thus contributing to neuronal death. Therefore, V-ATPase might be a promising indicator of developmental fluoride neurotoxicity.
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Affiliation(s)
- Xie Han
- Department of Preventive Medicine, School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; NHC Key Laboratory of Prevention and Treatment of Central Asia High Incidence Diseases (First Affiliated Hospital, School of Medicine, Shihezi University), People's Republic of China
| | - Yanling Tang
- Department of Preventive Medicine, School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; NHC Key Laboratory of Prevention and Treatment of Central Asia High Incidence Diseases (First Affiliated Hospital, School of Medicine, Shihezi University), People's Republic of China
| | - Yuanli Zhang
- Department of Preventive Medicine, School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; NHC Key Laboratory of Prevention and Treatment of Central Asia High Incidence Diseases (First Affiliated Hospital, School of Medicine, Shihezi University), People's Republic of China
| | - Jingjing Zhang
- Department of Preventive Medicine, School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; NHC Key Laboratory of Prevention and Treatment of Central Asia High Incidence Diseases (First Affiliated Hospital, School of Medicine, Shihezi University), People's Republic of China
| | - Zeyu Hu
- Department of Preventive Medicine, School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; NHC Key Laboratory of Prevention and Treatment of Central Asia High Incidence Diseases (First Affiliated Hospital, School of Medicine, Shihezi University), People's Republic of China
| | - Wanjing Xu
- Department of Preventive Medicine, School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; NHC Key Laboratory of Prevention and Treatment of Central Asia High Incidence Diseases (First Affiliated Hospital, School of Medicine, Shihezi University), People's Republic of China
| | - Shangzhi Xu
- Department of Preventive Medicine, School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; NHC Key Laboratory of Prevention and Treatment of Central Asia High Incidence Diseases (First Affiliated Hospital, School of Medicine, Shihezi University), People's Republic of China
| | - Qiang Niu
- Department of Preventive Medicine, School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; NHC Key Laboratory of Prevention and Treatment of Central Asia High Incidence Diseases (First Affiliated Hospital, School of Medicine, Shihezi University), People's Republic of China.
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15
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Zhang Y, Han X, Tang Y, Zhang J, Hu Z, Xu W, Yao P, Niu Q. Weakened interaction of ATG14 and the SNARE complex blocks autophagosome-lysosome fusion contributes to fluoride-induced developmental neurotoxicity. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 230:113108. [PMID: 34953272 DOI: 10.1016/j.ecoenv.2021.113108] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/02/2021] [Revised: 12/16/2021] [Accepted: 12/18/2021] [Indexed: 06/14/2023]
Abstract
Fluoride is capable of inducing developmental neurotoxicity, but the mechanisms involved remain unclear. We aimed to explore the role of autophagosome-lysosome fusion in developmental fluoride neurotoxicity, particularly focusing on the interaction between ATG14 and the soluble N-ethylmaleimide-sensitive factor attachment protein receptor (SNARE) complex. We developed in vivo models of Sprague-Dawley rats exposed to sodium fluoride (NaF) from the pregnancy of parental rats until the offspring were two months old and in vitro models of NaF and/or Ad-ATG14-treated SH-SY5Y cells. We assessed neurobehavioral changes in offspring and further investigated the effects of NaF exposure on autophagic flux, apoptosis, autophagosome-lysosome fusion, and the interaction between ATG14 and the SNARE complex. NaF exposure impaired offspring learning and memory capabilities and induced the accumulation of autophagosomes and autophagic flux blockage and apoptosis, as indicated by increased LC3-II, p62, and cleaved-caspase-3 expression in vivo and in vitro. In addition, NaF treatment downregulated the protein expression of ATG14 and the SNARE complex and induced autophagosome-lysosome fusion blockage as evidenced by decreased ATG14, STX17, SNAP29, and VAMP8 expression and diminished colocalization of autophagosomes and lysosomes in vivo and in vitro. Furthermore, ATG14 upregulation enhanced the interaction of ATG14 and the SNARE complex to facilitate autophagosome-lysosome fusion, thereby restoring autophagic flux and alleviating NaF-induced apoptosis. In conclusion, NaF exhibited developmental neurotoxicity by restraining the interaction of ATG14 with the SNARE complex and hindering autophagosome-lysosome fusion, thereby participating in the occurrence and development of fluoride neurotoxicity. Notably, ATG14 upregulation protects against developmental fluoride neurotoxicity, and ATG14 may serve as a promising biomarker for further epidemiological investigation.
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Affiliation(s)
- Yuanli Zhang
- Department of Preventive Medicine, School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China
| | - Xie Han
- Department of Preventive Medicine, School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China
| | - Yanling Tang
- Department of Preventive Medicine, School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China
| | - Jingjing Zhang
- Department of Preventive Medicine, School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China
| | - Zeyu Hu
- Department of Preventive Medicine, School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China
| | - Wanjing Xu
- Department of Preventive Medicine, School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China
| | - Ping Yao
- Department of Preventive Medicine, School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China
| | - Qiang Niu
- Department of Preventive Medicine, School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Preventive Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China; Key Laboratory of Xinjiang Endemic and Ethnic Diseases (Ministry of Education), School of Medicine, Shihezi University, Shihezi, Xinjiang, People's Republic of China.
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16
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Zhou G, Hu Y, Wang A, Guo M, Du Y, Gong Y, Ding L, Feng Z, Hou X, Xu K, Yu F, Li Z, Ba Y. Fluoride Stimulates Anxiety- and Depression-like Behaviors Associated with SIK2-CRTC1 Signaling Dysfunction. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2021; 69:13618-13627. [PMID: 34735150 DOI: 10.1021/acs.jafc.1c04907] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Using Sprague-Dawley rats and rat PC12 cells treated with sodium fluoride (NaF), we investigated the effects of SIK2-CRTC1 signaling on the neurobehavioral toxicity induced by fluoride. The in vivo results demonstrated that NaF treatment induced anxiety- and depression-like behaviors in juvenile rats, resulting in histological and ultrastructural abnormalities in the rat hippocampus and medial prefrontal cortex. Moreover, NaF exposure induced neuronal loss and excessive apoptosis. We also found that NaF elevated the expression of SIK2 and reduced the expression of CRTC1, brain-derived neurotrophic factor (BDNF), and VGF. The in vitro results showed that NaF suppressed cell viability, induced SIK2-CRTC1 signaling dysfunction, and caused excessive apoptosis in PC12 cells. Notably, targeted knockout of SIK2 with SIK2-siRNA or blocking of SIK2-CRTC1 signaling with 7,8-dihydroxyflavone (7,8-DHF) (as well as venlafaxine) can reduce apoptosis and increase cell viability in vitro. These findings suggest that neuronal death resulting from abnormal SIK2-CRTC1 signaling contributes to neurobehavioral toxicity induced by fluoride.
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Affiliation(s)
- Guoyu Zhou
- Department of Environmental Health, School of Public Health, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Yue Hu
- Department of Environmental Health, School of Public Health, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Anqi Wang
- Department of Environmental Health, School of Public Health, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Meng Guo
- Department of Environmental Health, School of Public Health, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Yuhui Du
- Department of Environmental Health, School of Public Health, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Yongxiang Gong
- Department of Environmental Health, School of Public Health, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Limin Ding
- Department of Environmental Health, School of Public Health, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Zichen Feng
- Department of Environmental Health, School of Public Health, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Xiangbo Hou
- Department of Environmental Health, School of Public Health, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Kaihong Xu
- Department of Environmental Health, School of Public Health, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Fangfang Yu
- Department of Environmental Health, School of Public Health, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Zhiyuan Li
- Department of Environmental Health, School of Public Health, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Yue Ba
- Department of Environmental Health, School of Public Health, Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
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17
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Wang D, Cao L, Pan S, Wang G, Wang L, Cao N, Hao X. Sirt3-mediated mitochondrial dysfunction is involved in fluoride-induced cognitive deficits. Food Chem Toxicol 2021; 158:112665. [PMID: 34780879 DOI: 10.1016/j.fct.2021.112665] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2021] [Revised: 10/17/2021] [Accepted: 11/04/2021] [Indexed: 01/11/2023]
Abstract
Excessive fluoride is capable of inducing cognitive deficits, but the mechanisms remain elusive. This study aimed to investigate the effects and underlying mechanisms of fluoride on mitochondrial dysfunction and neurobiological alterations, as well as cognitive impairment. C57BL/6 mice were orally administered 25, 50, and 100 mg/L NaF for 90 days. Cultured human neuroblastoma SH-SY5Y cells were exposed to NaF (110 mg/L) for 24 h in the presence or absence of Sirt3 overexpression. The results demonstrated that chronic exposure to high fluoride induced cognitive deficits and neural/synaptic injury in mice. Fluoride reduced mitochondrial antioxidant enzyme activities and elevated SOD2 acetylation by downregulating Sirt3 expression in the brains of mice and NaF-treated SH-SY5Y cells. Moreover, fluoride lowered mtDNA transcription and induced mitochondrial dysfunction along with increased FoxO3A acetylation in the brains of mice and NaF-treated SH-SY5Y cells. Subsequent experiments revealed that overexpression of Sirt3 significantly attenuated the adverse effects of fluoride on radical scavenging capabilities and mtDNA transcription, as well as mitochondrial function in SH-SY5Y cells. These results suggest that chronic long-term fluoride exposure evokes neural/synaptic injury and cognitive impairment through mitochondrial dysfunction and its associated oxidative stress, which is, at least partly, mediated by Sirt3 inhibition in the mouse brain.
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Affiliation(s)
- Dongmei Wang
- School of Basic Medical Sciences, Henan University of Science and Technology, Henan, Luoyang, 471003, China.
| | - Luyang Cao
- School of Basic Medical Sciences, Henan University of Science and Technology, Henan, Luoyang, 471003, China
| | - Shunji Pan
- School of Basic Medical Sciences, Henan University of Science and Technology, Henan, Luoyang, 471003, China
| | - Gang Wang
- School of Basic Medical Sciences, Henan University of Science and Technology, Henan, Luoyang, 471003, China
| | - Lewei Wang
- School of Basic Medical Sciences, Henan University of Science and Technology, Henan, Luoyang, 471003, China
| | - Ningyao Cao
- School of Basic Medical Sciences, Henan University of Science and Technology, Henan, Luoyang, 471003, China
| | - Xueqin Hao
- School of Basic Medical Sciences, Henan University of Science and Technology, Henan, Luoyang, 471003, China
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18
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Liu P, Li R, Tian X, Zhao Y, Li M, Wang M, Ying X, Yuan J, Xie J, Yan X, Lyu Y, Wei C, Qiu Y, Tian F, Zhao Q, Yan X. Co-exposure to fluoride and arsenic disrupts intestinal flora balance and induces testicular autophagy in offspring rats. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 222:112506. [PMID: 34265531 DOI: 10.1016/j.ecoenv.2021.112506] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/30/2021] [Revised: 07/06/2021] [Accepted: 07/07/2021] [Indexed: 06/13/2023]
Abstract
While numerous studies have shown that fluoride or arsenic exposure may damage the reproductive system, there are few reports of co-exposure to fluoride and arsenic. In addition, the literature on autophagy and intestinal flora composition in reproductive toxicity studies of co-exposure to fluoride and arsenic is insufficient. In this study, we developed a rat model of fluoride and arsenic exposure via drinking water from pre-pregnancy to 90 days postnatal. Sprague-Dawley rats were randomly divided into sterile water control group, fluoride group (100 mg/L NaF), arsenic group (50 mg/L NaAsO2) and combined exposure group (100 mg/L NaF+50 mg/L NaAsO2). Our results showed that fluoride and arsenic exposure caused a reduction in testicular weight and significant pathological damage to tissue. We found that the levels of follicle-stimulating hormone, luteinizing hormone, and testosterone were reduced to varying degrees. Meanwhile experiments showed that fluoride and arsenic exposure can modulate autophagic flux, causing increased levels of Beclin1 and LC3 expression and decreased p62 expression. Analogously, by performing 16S sequencing of rat feces, we found 24 enterobacterial genera that differed significantly among the groups. Furthermore, the flora associated with testicular injury were identified by correlation analysis of hormonal indices and autophagy alterations with intestinal flora composition at the genus level, respectively. In summary, our study shows that fluoride and arsenic co-exposure alters autophagic flux in the testis, causes testicular injury, and reveals an association between altered intestinal flora composition and testicular injury.
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Affiliation(s)
- Penghui Liu
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi 030001, China
| | - Ran Li
- Shanxi Medical University School and Hospital of Stomatology, Taiyuan 030001, China; Shanxi Province Key Laboratory of Oral Diseases Prevention and New Materials, Taiyuan, Shanxi 030001, China
| | - Xiaolin Tian
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi 030001, China; Shanxi Key Laboratory of Ecological Animal Science and Environmental Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, China
| | - Yannan Zhao
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi 030001, China
| | - Meng Li
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi 030001, China
| | - Meng Wang
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi 030001, China
| | - Xiaodong Ying
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi 030001, China
| | - Jiyu Yuan
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi 030001, China
| | - Jiaxin Xie
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi 030001, China
| | - Xiaoting Yan
- Department of Urology, The First Hospital of Shanxi Medical University, Taiyuan, Shanxi 030001, China
| | - Yi Lyu
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi 030001, China
| | - Cailing Wei
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi 030001, China
| | - Yulan Qiu
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi 030001, China
| | - Fengjie Tian
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi 030001, China
| | - Qian Zhao
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi 030001, China
| | - Xiaoyan Yan
- School of Public Health, Shanxi Medical University, Taiyuan, Shanxi 030001, China.
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19
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Recent advances in cellular effects of fluoride: an update on its signalling pathway and targeted therapeutic approaches. Mol Biol Rep 2021; 48:5661-5673. [PMID: 34254226 DOI: 10.1007/s11033-021-06523-6] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2021] [Accepted: 06/25/2021] [Indexed: 12/23/2022]
Abstract
Fluoride is a natural element essential in minute quantities in human's to maintain dental and skeletal health. However, the disease fluorosis manifests itself due to excessive fluoride intake mostly through drinking water and sometimes through food. At the cellular energetics level, fluoride is a known inhibitor of glycolysis. At the tissue level, the effect of fluoride has been more pronounced in the musculoskeletal systems due to its ability to retain fluoride. Fluoride alters dentinogenesis, thereby affecting the tooth enamel formation. In bones, fluoride alters the osteogenesis by replacing calcium, thus resulting in bone deformities. In skeletal muscles, high concentration and long term exposure to fluoride causes loss of muscle proteins leading to atrophy. Although fluorosis is quite a familiar problem, the exact molecular pathway is not yet clear. Extensive research on the effects of fluoride on various organs and its toxicity was reported. Indeed, it is clear that high and chronic exposure to fluoride causes cellular apoptosis. Accordingly, in this review, we have highlighted fluoride-mediated apoptosis via two vital pathways, mitochondrial-mediated and endoplasmic reticulum stress pathways. This review also elaborates on new cellular energetic, apoptotic pathways and therapeutic strategies targeted to treat fluorosis.
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20
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Tang Z, Lai CC, Luo J, Ding YT, Chen Q, Guan ZZ. Mangiferin prevents the impairment of mitochondrial dynamics and an increase in oxidative stress caused by excessive fluoride in SH-SY5Y cells. J Biochem Mol Toxicol 2021; 35:e22705. [PMID: 33393728 DOI: 10.1002/jbt.22705] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/04/2020] [Revised: 09/21/2020] [Accepted: 12/17/2020] [Indexed: 11/08/2022]
Abstract
Previous studies both invivo and in vitro have revealed that high levels of fluoride cause neurotoxicity. Mangiferin has been reported to possess antioxidant, antiapoptotic, and anti-inflammatory properties. The present study was designed to characterize the mechanisms by which mangiferin protects against NaF-induced neurotoxicity. Increased levels of proapoptotic Bax, Caspase-3, Caspase-9, and cleaved-caspase 3, as well as a decreased level of antiapoptotic Bcl-2 induced by fluoride in human neuroblastoma SH-SY5Y cells, these effects were prevented by pretreatment of mangiferin. In addition, mangiferin attenuated the enhancement of p-JNK, reductions of Nrf2 and HO-1, and increased level of the mitochondrial fission proteins Drp1 caused by fluoride. Moreover, oxidative stress, as reflected in the levels of reactive oxygen species, 8-hydroxy-2'-deoxyguanosine, and 4-hydroxynonenal, was elevated by fluoride and these effects were again ameliorated by mangiferin. In conclusion, protection by mangiferin against fluoride-induced neurotoxicity involves normalizing the impaired mitochondrial apoptotic pathway and dynamics and reducing oxidative stress via inactivation of the JNK and activation of the Nrf2/HO-1 pathways.
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Affiliation(s)
- Zhi Tang
- Key Laboratory of Endemic and Ethnic Disease, Guizhou Medical University, Ministry of Education, Guiyang, China.,Department of Pathology, The Affiliated Hospital of Guizhou Medical University, Guiyang, China.,Clinical Research Center, The First Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Guiyang, China
| | - Chen-Cen Lai
- Clinical Research Center, The First Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Guiyang, China
| | - Jun Luo
- Department of Pharmacy, The First Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Guiyang, China
| | - Yuan-Ting Ding
- Clinical Research Center, The First Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Guiyang, China
| | - Qian Chen
- Clinical Research Center, The First Affiliated Hospital of Guizhou University of Traditional Chinese Medicine, Guiyang, China
| | - Zhi-Zhong Guan
- Key Laboratory of Endemic and Ethnic Disease, Guizhou Medical University, Ministry of Education, Guiyang, China.,Department of Pathology, The Affiliated Hospital of Guizhou Medical University, Guiyang, China
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21
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Dey Bhowmik A, Podder S, Mondal P, Shaw P, Bandyopadhyay A, Das A, Bhattacharjee P, Chakraborty A, Sudarshan M, Chattopadhyay A. Chronic exposure to environmentally relevant concentration of fluoride alters Ogg1 and Rad51 expressions in mice: Involvement of epigenetic regulation. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 202:110962. [PMID: 32800233 DOI: 10.1016/j.ecoenv.2020.110962] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 06/26/2020] [Accepted: 06/28/2020] [Indexed: 06/11/2023]
Abstract
Chronic exposure to fluoride (F) beyond the permissible limit (1.5 ppm) is known to cause detrimental health effects by induction of oxidative stress-mediated DNA damage overpowering the DNA repair machinery. In the present study, we assessed F induced oxidative stress through monitoring biochemical parameters and looked into the effect of chronic F exposure on two crucial DNA repair genes Ogg1 and Rad51 having important role against ROS induced DNA damages. To address this issue, we exposed Swiss albino mice to an environmentally relevant concentration of fluoride (15 ppm NaF) for 8 months. Results revealed histoarchitectural damages in liver, brain, kidney and spleen. Depletion of GSH, increase in lipid peroxidation and catalase activity in liver and brain confirmed the generation of oxidative stress. qRT-PCR result showed that expressions of Ogg1 and Rad51 were altered after F exposure in the affected organs. Promoter hypermethylation was associated with the downregulation of Rad51. F-induced DNA damage and the compromised DNA repair machinery triggered intrinsic pathway of apoptosis in liver and brain. The present study indicates the possible association of epigenetic regulation with F induced neurotoxicity.
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Affiliation(s)
- Arpan Dey Bhowmik
- Department of Zoology, Visva-Bharati, Santiniketan, 731235, West Bengal, India
| | - Santosh Podder
- Department of Zoology, Visva-Bharati, Santiniketan, 731235, West Bengal, India; Indian Institute of Science Education and Research (IISER) Pune, Dr. Homi Bhabha Road, Pashan, Pune, 411 008, India
| | - Paritosh Mondal
- Department of Zoology, Visva-Bharati, Santiniketan, 731235, West Bengal, India
| | - Pallab Shaw
- Department of Zoology, Visva-Bharati, Santiniketan, 731235, West Bengal, India
| | | | - Ankita Das
- Department of Environmental Science, University of Calcutta, 35, Ballygunge Circular Road, Kolkata, 700019, India
| | - Pritha Bhattacharjee
- Department of Environmental Science, University of Calcutta, 35, Ballygunge Circular Road, Kolkata, 700019, India
| | - Anindita Chakraborty
- UGC-DAE Consortium for Scientific Research, Kolkata Centre, 3/LB-8, Bidhan Nagar, Kolkata, 700098, India
| | - Muthammal Sudarshan
- UGC-DAE Consortium for Scientific Research, Kolkata Centre, 3/LB-8, Bidhan Nagar, Kolkata, 700098, India
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22
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An ICT-based fluorescent probe for the detection of fluoride ions in cellular mitochondria. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2019.112349] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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