1
|
Huang H, Lin Y, Xin J, Sun N, Zhao Z, Wang H, Duan L, Zhou Y, Liu X, Fang J, Jing B, Pan K, Zeng Y, Zeng D, Li H, Ma H, Bai Y, Wei L, Ni X. Fluoride exposure-induced gut microbiota alteration mediates colonic ferroptosis through N 6-methyladenosine (m 6A) mediated silencing of SLC7A11. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2024; 283:116816. [PMID: 39096685 DOI: 10.1016/j.ecoenv.2024.116816] [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: 02/08/2024] [Revised: 07/24/2024] [Accepted: 07/27/2024] [Indexed: 08/05/2024]
Abstract
Fluoride exposure is widespread worldwide and poses a significant threat to organisms, particularly to their gastrointestinal tracts. However, due to limited knowledge of the mechanism of fluoride induced intestinal injury, it has been challenging to develop an effective treatment. To address this issue, we used a series of molecular biology in vitro and in vivo experiments. NaF triggered m6A mediated ferroptosis to cause intestinal damage. Mechanistically, NaF exposure increased the m6A level of SLC7A11 mRNA, promoted YTHDF2 binding to m6A-modified SLC7A11 mRNA, drove the degradation of SLC7A11 mRNA, and led to a decrease in its protein expression, which eventually triggers ferroptosis. Moreover, NaF aggravated ferroptosis of the colon after antibiotics destroyed the composition of gut microbiota. 16 S rRNA sequencing and SPEC-OCCU plots, Zi-Pi relationships, and Spearman correlation coefficients verified that Lactobacillus murinus (ASV54, ASV58, and ASV82) plays a key role in the response to NaF-induced ferroptosis. Collectively, NaF-induced gut microbiota alteration mediates severe intestinal cell injury by inducing m6A modification-mediated ferroptosis. Our results highlight a key mechanism of the gut in response to NaF exposure and suggest a valuable theoretical basis for its prevention and treatment.
Collapse
Affiliation(s)
- Haonan Huang
- Animal Microecology Institute, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Yu Lin
- Department of Gastroenterology, Southern Medical University Hospital of Integrative Chinese and Western Medicine, Southern Medical University, Guangzhou, China
| | - Jinge Xin
- Baiyun Branch, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Ning Sun
- Animal Microecology Institute, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Zhifang Zhao
- Department of Gastroenterology, National Institution of Drug Clinical Trial, Guizhou Provincial People's Hospital, Medical College of Guizhou University, Guiyang, Guizhou, China
| | - Hesong Wang
- Baiyun Branch, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Lixiao Duan
- Animal Microecology Institute, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Yanxi Zhou
- Animal Microecology Institute, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Xingmei Liu
- Animal Microecology Institute, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Jing Fang
- Animal Microecology Institute, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Bo Jing
- Animal Microecology Institute, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Kangcheng Pan
- Animal Microecology Institute, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Yan Zeng
- Animal Microecology Institute, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Dong Zeng
- Animal Microecology Institute, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China
| | - Hao Li
- Plateau Brain Science Research Center, Tibet University, Lhasa, Tibet 850000, China
| | - Hailin Ma
- Plateau Brain Science Research Center, Tibet University, Lhasa, Tibet 850000, China
| | - Yang Bai
- Baiyun Branch, Nanfang Hospital, Southern Medical University, Guangzhou, China.
| | - Limin Wei
- Chongqing Key Laboratory of High Active Traditional Chinese Drug Delivery System, Chongqing Medical and Pharmaceutical College, Chongqing 401331, China.
| | - Xueqin Ni
- Animal Microecology Institute, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, Sichuan, China.
| |
Collapse
|
2
|
Liang C, Zhuang C, Cheng C, Bai J, Wu Y, Li X, Yang J, Li B, Fu W, Zhu Q, Lv J, Tan Y, Kumar Manthari R, Zhao Y, Wang J, Zhang J. Fluoride induces hepatointestinal damage and vitamin B 2 mitigation by regulating IL-17A and Bifidobacterium in ileum. J Adv Res 2024:S2090-1232(24)00317-5. [PMID: 39097090 DOI: 10.1016/j.jare.2024.07.034] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2024] [Revised: 05/31/2024] [Accepted: 07/29/2024] [Indexed: 08/05/2024] Open
Abstract
INTRODUCTION Fluorosis is a global public health disease affecting more than 50 countries and 500 million people. Excessive fluoride damages the liver and intestines, yet the mechanisms and therapeutic approaches remain unclear. OBJECTIVES To explore the mechanisms by which fluoride-induced intestinal-hepatic damage and vitamin B2 alleviation. METHODS Fluoride and/or vitamin B2-treated IL-17A knockout and wild-type mouse models were established, the morphological and functional changes of liver and gut, total bile acid biosynthesis, metabolism, transport, and regulation of FXR-FGF15 signaling pathways were evaluated, the ileal microbiome was further analyzed by 16S rDNA sequence. Finally, Bifidobacterium supplementation mouse model was designed and re-examined the above indicators. RESULTS The results demonstrated that fluoride induced hepatointestinal injury and enterohepatic circulation disorder by altering the synthesis, transporters, and FXR-FGF15 pathway regulation of total bile acid. Importantly, the ileum was found to be the most sensitive and fluoride changed ileal microbiome particularly by reducing abundance of Bifidobacterium. While vitamin B2 supplementation attenuated fluoride-induced enterohepatic circulation dysfunction through IL-17A and ileal microbiome, Bifidobacterium supplementation also reversed fluoride-induced hepatointestinal injury. CONCLUSION Fluoride induces morphological and functional impairment of liver and gut tissues, as well as enterohepatic circulation disorder by altering total bile acid (TBA) synthesis, transporters, and FXR-FGF15 signaling regulation. Vitamin B2 attenuated fluoride-induced enterohepatic circulation disorder through IL-17A knockout and ileal microbiome regulation. The ileum was found to be the most sensitive to fluoride, leading to changes in ileal microbiome, particularly the reduction of Bifidobacterium. Furthermore, Bifidobacterium supplementation reversed fluoride-induced hepatointestinal injury. This study not only elucidates a novel mechanism by which fluoride causes hepatointestinal toxicity, but also provides a new physiological function of vitamin B2, which will be useful in the therapy of fluorosis and other hepatoenterological diseases.
Collapse
Affiliation(s)
- Chen Liang
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Cuicui Zhuang
- College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Chenkai Cheng
- College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Jian Bai
- College of Life Science, Lv Liang University, Lishi, Shanxi 033001, PR China
| | - Yue Wu
- College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Xiang Li
- College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Jie Yang
- College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Bohui Li
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Weixiang Fu
- College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Qianlong Zhu
- College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Jiawei Lv
- College of Animal Science, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Yanjia Tan
- College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Ram Kumar Manthari
- Department of Biotechnology, GITAM Institute of Science, Gandhi Institute of Technology and Management, Visakhapatnam 530045, Andhra Pradesh, India
| | - Yangfei Zhao
- College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Jundong Wang
- College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China
| | - Jianhai Zhang
- College of Veterinary Medicine, Shanxi Agricultural University, Taigu, Shanxi 030801, PR China.
| |
Collapse
|
3
|
Li Y, Yin N, Cai X, Wang P, Fan C, Chang X, Liu X, Geng Z, Cui L, Du X, Cui Y. Effects of calcium supplements on oral bioavailability of fluoride in soil based on In Vivo and In Vitro methods. JOURNAL OF HAZARDOUS MATERIALS 2023; 456:131663. [PMID: 37224715 DOI: 10.1016/j.jhazmat.2023.131663] [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: 02/17/2023] [Revised: 04/30/2023] [Accepted: 05/17/2023] [Indexed: 05/26/2023]
Abstract
Dietary calcium (Ca) intake can alleviate fluoride (F) induced fluorosis to maintain bone health. However, it is unclear whether calcium supplements can reduce the oral bioavailability of F present in contaminated soils. Here we evaluated the effects of Ca supplements on F bioavailability in three soils using an in vitro method (Physiologically Based Extraction Test) and an in vivo mouse model. Seven Ca salts, commonly used in calcium supplements, significantly reduced the F bioaccessibility in the gastric and small intestinal phases. Particularly for Ca phosphate at 150 mg Ca supplementation, F bioaccessibility in the small intestinal phase was reduced from 35.1-38.8% to 0.7-1.9% where soluble F concentrations were less than 1 mg/L. Overall, the eight Ca tablets tested in this study showed greater efficiency at decreasing F solubility. The in vitro bioaccessibility after Ca supplementation was consistent with the relative bioavailability of F. As supported by X-ray photoelectron spectroscopy, a possible mechanism is that freed F can be bound by Ca to form insoluble CaF2 and exchanged with OH groups from Al/Fe hydroxide to strongly adsorb F. These findings provide evidence of Ca supplementation in reducing health risks associated soil F exposure.
Collapse
Affiliation(s)
- Yunpeng Li
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, PR China; Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing 100085, PR China
| | - Naiyi Yin
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, PR China; Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing 100085, PR China.
| | - Xiaolin Cai
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, PR China; Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing 100085, PR China
| | - Pengfei Wang
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, PR China; Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing 100085, PR China
| | - Chuanfang Fan
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, PR China; Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing 100085, PR China
| | - Xuhui Chang
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, PR China; Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing 100085, PR China
| | - Xiaotong Liu
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, PR China; Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing 100085, PR China
| | - Ziqi Geng
- Sino-Danish College, University of Chinese Academy of Sciences, Beijing 101408, PR China
| | - Liwei Cui
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, PR China; Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing 100085, PR China
| | - Xin Du
- CHINALCO Environmental protection and Energy Conservation Group Co. Ltd., Beijing 101300, PR China
| | - Yanshan Cui
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 101408, PR China; Research Center for Eco-Environment Sciences, Chinese Academy of Sciences, Beijing 100085, PR China.
| |
Collapse
|
4
|
Moran GP, Zgaga L, Daly B, Harding M, Montgomery T. Does fluoride exposure impact on the human microbiome? Toxicol Lett 2023; 379:11-19. [PMID: 36871794 DOI: 10.1016/j.toxlet.2023.03.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2023] [Revised: 02/17/2023] [Accepted: 03/01/2023] [Indexed: 03/06/2023]
Abstract
Fluoride is added to drinking water in some countries to prevent tooth decay (caries). There is no conclusive evidence that community water fluoridation (CWF) at WHO recommended concentrations for caries prevention has any harmful effects. However, research is ongoing regarding potential effects of ingested fluoride on human neurodevelopment and endocrine dysfunction. Simultaneously, research has emerged highlighting the significance of the human microbiome in gastrointestinal and immune health. In this review we evaluate the literature examining the effect of fluoride exposure on the human microbiome. Unfortunately, none of the studies retrieved examined the effects of ingested fluoridated water on the human microbiome. Animal studies generally examined acute fluoride toxicity following ingestion of fluoridated food and water and conclude that fluoride exposure can detrimentally perturb the normal microbiome. These data are difficult to extrapolate to physiologically relevant human exposure dose ranges and the significance to humans living in areas with CWF requires further investigation. Conversely, evidence suggests that the use of fluoride containing oral hygiene products may have beneficial effects on the oral microbiome regarding caries prevention. Overall, while fluoride exposure does appear to impact the human and animal microbiome, the long-term consequences of this requires further study.
Collapse
Affiliation(s)
- Gary P Moran
- School of Dental Science Trinity College Dublin and Dublin Dental University Hospital, Dublin 2, Republic of Ireland.
| | - Lina Zgaga
- Department of Public Health and Primary Care, School of Medicine, Trinity College Dublin, Dublin 24, Republic of Ireland
| | - Blánaid Daly
- School of Dental Science Trinity College Dublin and Dublin Dental University Hospital, Dublin 2, Republic of Ireland
| | - Mairead Harding
- Oral Health Services Research Centre, University College Cork, Cork, Republic of Ireland
| | - Therese Montgomery
- Department of Analytical, Biopharmaceutical and Medical Sciences, Atlantic Technological University (ATU) Galway, Galway, Republic of Ireland
| |
Collapse
|
5
|
Gao XY, Jin Y, Zhao J, Zhang YL, Wang HW, Zhou BH. Th17-Related Cytokines Involved in Fluoride-Induced Cecal and Rectal Barrier Damage of Ovariectomized Rats. Biol Trace Elem Res 2022:10.1007/s12011-022-03519-6. [PMID: 36538210 DOI: 10.1007/s12011-022-03519-6] [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: 07/17/2022] [Accepted: 12/05/2022] [Indexed: 12/24/2022]
Abstract
To investigate fluoride (F)-induced intestine barrier damage and the role of estrogen deficiency in this progress, a rat model of estrogen deficiency was established through bilateral surgical removal of ovaries. The F exposure model was then continued by adding sodium fluoride (0, 25, 50, and 100 mg/L, calculated on a fluorine ion basis) to drinking water for 90 days. Afterward, intestinal mucosal structure, barrier function, and inflammatory cytokines were evaluated. The results showed that excessive F decreased the developmental parameters (crypt depth) of the cecum and rectum and inhibited the proliferation capacity of the intestinal epithelia, which are more obvious in the state of estrogen deficiency. The distribution of goblet cells and glycoproteins in the intestinal mucosa decreased with the increase in F concentration, and estrogen deficiency led to a further decline, especially in the rectum. Using the immunofluorescence method, the study showed that excessive F caused interleukin-17A (IL-17A) significantly decrease in the cecum and increase in the rectum. Meanwhile, F treatment remarkably upregulated the expression of intestinal IL-1β, IL-23, and IL-22, while the level of IL-6 was downregulated. In addition, estrogen deficiency increased IL-1β, IL-6, IL-23, and IL-22, but decreased IL-17A expression in the cecum and rectum. Collectively, F exposure damaged intestinal morphological structure, inhibited epithelial cell proliferation and mucus barrier function, and resulted in the disturbance of T helper (Th) 17 cell-related cytokines expression. Estrogen deficiency may further aggravate F-induced damage to the cecum and rectum.
Collapse
Affiliation(s)
- Xiao-Ying Gao
- Henan Key Laboratory of Environmental and Animal Product Safety, College of Animal Science and Technology, Henan University of Science and Technology, Kaiyuan Avenue 263, Luoyang, 471000, Henan, People's Republic of China
| | - Ye Jin
- Henan Key Laboratory of Environmental and Animal Product Safety, College of Animal Science and Technology, Henan University of Science and Technology, Kaiyuan Avenue 263, Luoyang, 471000, Henan, People's Republic of China
| | - Jing Zhao
- Henan Key Laboratory of Environmental and Animal Product Safety, College of Animal Science and Technology, Henan University of Science and Technology, Kaiyuan Avenue 263, Luoyang, 471000, Henan, People's Republic of China
| | - Yu-Ling Zhang
- Henan Key Laboratory of Environmental and Animal Product Safety, College of Animal Science and Technology, Henan University of Science and Technology, Kaiyuan Avenue 263, Luoyang, 471000, Henan, People's Republic of China
| | - Hong-Wei Wang
- Henan Key Laboratory of Environmental and Animal Product Safety, College of Animal Science and Technology, Henan University of Science and Technology, Kaiyuan Avenue 263, Luoyang, 471000, Henan, People's Republic of China
| | - Bian-Hua Zhou
- Henan Key Laboratory of Environmental and Animal Product Safety, College of Animal Science and Technology, Henan University of Science and Technology, Kaiyuan Avenue 263, Luoyang, 471000, Henan, People's Republic of China.
| |
Collapse
|
6
|
Jin Y, Gao XY, Zhao J, Tian WS, Zhang YL, Tian EJ, Zhou BH, Wang HW. Estrogen deficiency aggravates fluoride-induced small intestinal mucosa damage and junctional complexes proteins expression disorder in rats. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 246:114181. [PMID: 36252517 DOI: 10.1016/j.ecoenv.2022.114181] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2022] [Revised: 10/05/2022] [Accepted: 10/10/2022] [Indexed: 06/16/2023]
Abstract
To investigate the effect of estrogen deficiency on the small intestinal mucosal barrier induced by fluoride (F), F exposure models of ovariectomy (OVX) rats (surgically removed ovaries) and non-OVX rats (normal condition) were established by adding sodium fluoride (NaF) (0, 25, 50, and 100 mg/L, calculated by F ion) in drinking water for 90 days. The intestinal mucosal histomorphology, mucosal barrier function, and protein expression levels of tight junctions (TJs), adhesion junctions (AJs), and desmosomes were evaluated in the duodenum, jejunum, and ileum. Hematoxylin-eosin (HE) staining and 5-Bromo-2-deoxyUridine (BrdU) measurement showed that excessive F-induced damage to intestinal epithelial cells and inhibited the proliferation of intestinal epithelial cells, eventually decreasing the number of goblet cells and decreasing glycoprotein secretion, as indicated by Alcian blue and periodic acid-Schiff (AB-PAS) and periodic acid-Schiff (PAS) staining. Further immunofluorescence analysis demonstrated that excessive F decreased the protein expression levels of occludin, zonula occludens-1 (ZO-1), E-cadherin, and desmoplakin (P < 0.05, P < 0.01) and enhanced the expression of claudin-2 (P < 0.01), suggesting that cell-to-cell junctions were disrupted. Collectively, F exposure impaired the small intestinal mucosal barrier by inducing damage to intestinal epithelial cells and inhibiting intestinal epithelial cell proliferation. Disorders in the junctional complex protein expression blocked the synergy between intercellular communication and aggravated mucosal injury. In particular, estrogen deficiency exacerbated F-induced enterotoxicity, which provides new explanations for the development and severity of intestinal disease in postmenopausal women with high-F areas.
Collapse
Affiliation(s)
- Ye Jin
- Henan Key Laboratory of Environmental and Animal Product Safety, Henan University of Science and Technology, Luoyang 471000, Henan, People's Republic of China.
| | - Xiao-Ying Gao
- Henan Key Laboratory of Environmental and Animal Product Safety, Henan University of Science and Technology, Luoyang 471000, Henan, People's Republic of China.
| | - Jing Zhao
- Henan Key Laboratory of Environmental and Animal Product Safety, Henan University of Science and Technology, Luoyang 471000, Henan, People's Republic of China.
| | - Wei-Shun Tian
- Henan Key Laboratory of Environmental and Animal Product Safety, Henan University of Science and Technology, Luoyang 471000, Henan, People's Republic of China.
| | - Yu-Ling Zhang
- Henan Key Laboratory of Environmental and Animal Product Safety, Henan University of Science and Technology, Luoyang 471000, Henan, People's Republic of China.
| | - Er-Jie Tian
- Henan Key Laboratory of Environmental and Animal Product Safety, Henan University of Science and Technology, Luoyang 471000, Henan, People's Republic of China.
| | - Bian-Hua Zhou
- Henan Key Laboratory of Environmental and Animal Product Safety, Henan University of Science and Technology, Luoyang 471000, Henan, People's Republic of China.
| | - Hong-Wei Wang
- Henan Key Laboratory of Environmental and Animal Product Safety, Henan University of Science and Technology, Luoyang 471000, Henan, People's Republic of China.
| |
Collapse
|