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Zhu L, Jia X, Xie H, Zhang J, Zhu Q. Trichloroethylene exposure, multi-organ injury, and potential mechanisms: A narrative review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 946:174029. [PMID: 38944297 DOI: 10.1016/j.scitotenv.2024.174029] [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: 04/18/2024] [Revised: 06/13/2024] [Accepted: 06/13/2024] [Indexed: 07/01/2024]
Abstract
Trichloroethylene (TCE) is a common environmental pollutant and industrial chemical that has been associated with adverse health effects, especially on organ systems. The purpose of this review is to summarize the current findings on organ system damage caused by TCE exposure and the underlying mechanisms involved. Numerous studies have shown that TCE exposure may cause damage to multiple organ systems, mainly the skin, liver, kidney, and circulatory system. The mechanisms leading to TCE-induced organ system damage are complex and diverse. TCE is metabolized in vivo to reactive intermediates, through which TCE can induce oxidative stress, interfere with cell signaling pathways, and promote inflammatory responses. In addition, studies have shown that TCE interferes with DNA repair mechanisms, leading to genotoxicity and potentially carcinogenic effects. This review highlights the importance of understanding the deleterious effects of TCE exposure on organ systems and provides insights into the underlying mechanisms involved. Further research is needed to elucidate the full range of organ system damage caused by TCE and to develop effective prevention and treatment strategies.
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Affiliation(s)
- Lifu Zhu
- Department of Occupational Health and Environmental Health, School of Public Health, Anhui Medical University, Hefei, PR China
| | - Xueqian Jia
- Department of Occupational Health and Environmental Health, School of Public Health, Anhui Medical University, Hefei, PR China
| | - Haibo Xie
- Institute of Dermatology, The First Affiliated Hospital of Anhui Medical University, Hefei, PR China; Key Laboratory of Dermatology, Ministry of Education, The First Affiliated Hospital of Anhui Medical University, Hefei, PR China
| | - Jiaxiang Zhang
- Department of Occupational Health and Environmental Health, School of Public Health, Anhui Medical University, Hefei, PR China; The Center for Scientific Research, AnhuiMedical University, Hefei, Anhui, China.
| | - Qixing Zhu
- Institute of Dermatology, The First Affiliated Hospital of Anhui Medical University, Hefei, PR China; Key Laboratory of Dermatology, Ministry of Education, The First Affiliated Hospital of Anhui Medical University, Hefei, PR China.
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Zhang J, Huang H, Ding B, Liu Z, Chen D, Li S, Shen T, Zhu Q. Histone demethylase KDM4A mediating macrophage polarization: A potential mechanism of trichloroethylene induced liver injury. Cell Biol Int 2024; 48:1148-1159. [PMID: 38800986 DOI: 10.1002/cbin.12187] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2024] [Revised: 03/26/2024] [Accepted: 05/02/2024] [Indexed: 05/29/2024]
Abstract
Trichloroethylene (TCE) is a commonly used organic solvent in industry. Our previous studies have found that TCE can cause liver injury accompanied by macrophage polarization, but the specific mechanism is unclear. The epigenetic regulation of macrophage polarization is mainly focused on histone modification. Histone lysine demethylase 4A (KDM4A) is involved in the activation of macrophages. In this study, we used a mouse model we investigated the role of KDM4A in the livers of TCE-drinking mice and found that the expression of KDM4A, M1-type polarization indicators, and related inflammatory factors in the livers of TCE-drinking mice. In the study, BALB/c mice were randomly divided into four groups: 2.5 mg/mL TCE dose group and 5.0 mg/mL TCE dose group, the vehicle control group, and the blank control group. We found that TCE triggered M1 polarization of mouse macrophages, characterized by the expression of CD11c and robust production of inflammatory cytokines. Notably, exposure to TCE resulted in markedly increased expression of KDM4A in macrophages. Functionally, the increased expression of KDM4A significantly impaired the expression of H3K9me3 and H3K9me2 and increased the expression of H3K9me1. In addition, KDM4A potentially represents a novel epigenetic modulator, with its upregulation connected to β-catenin activation, a signal critical for the pro-inflammatory activation of macrophages. Furthermore, KDM4A inhibitor JIB-04 treatment resulted in a decrease in β-catenin expression and prevented TCE-induced M1 polarization and the expression of the pro-inflammatory cytokines TNF-α and IL-1β. These results suggest that the association of KDM4A and Wnt/β-catenin cooperatively establishes the activation and polarization of macrophages and global changes in H3K9me3/me2/me1. Our findings identify KDM4A as an essential regulator of the polarization of macrophages and the expression of inflammatory cytokines, which might serve as a potential target for preventing and treating liver injury caused by TCE.
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Affiliation(s)
- Jiaxiang Zhang
- Department of Occupational Health and Environmental Health, School of Public Health, Anhui Medical University, Hefei, Anhui, China
- Institute of Dermatology, Key Laboratory of Dermatology, Ministry of Education, Hefei, Anhui, China
| | - Hua Huang
- Department of Occupational Health and Environmental Health, School of Public Health, Anhui Medical University, Hefei, Anhui, China
- Department Of Infectious Disease Prevention and Control, Linan District Center for Disease Control and Prevention, Hangzhou City, Zhejiang Province, China
| | - Baiwang Ding
- Department of Occupational Health and Environmental Health, School of Public Health, Anhui Medical University, Hefei, Anhui, China
- Department Of Infectious Disease Prevention and Control, Linan District Center for Disease Control and Prevention, Hangzhou City, Zhejiang Province, China
| | - Zhibing Liu
- Institute of Dermatology, Key Laboratory of Dermatology, Ministry of Education, Hefei, Anhui, China
- Department of Dermatology, First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
| | - Daojun Chen
- Institute of Medical Technology, Anhui Medical College, Hefei, Anhui, China
| | - Shulong Li
- The Center for Scientific Research, Anhui Medical University, Hefei, Anhui, China
| | - Tong Shen
- Department of Occupational Health and Environmental Health, School of Public Health, Anhui Medical University, Hefei, Anhui, China
- Institute of Dermatology, Key Laboratory of Dermatology, Ministry of Education, Hefei, Anhui, China
| | - Qixing Zhu
- Institute of Dermatology, Key Laboratory of Dermatology, Ministry of Education, Hefei, Anhui, China
- Department of Dermatology, First Affiliated Hospital of Anhui Medical University, Hefei, Anhui, China
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Peng X, Tan L, Song J, Lai Y, Yu S, Xu F, Wei Q, He Z, Cheng W, Zhang W, Yang X. Geniposide alleviated hydrogen peroxide-induced apoptosis of human hepatocytes via altering DNA methylation. Food Chem Toxicol 2023; 182:114158. [PMID: 37940031 DOI: 10.1016/j.fct.2023.114158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2023] [Revised: 10/25/2023] [Accepted: 10/26/2023] [Indexed: 11/10/2023]
Abstract
Geniposide (GP) is the homology of medicine and food with bioactive effects of antioxidation and resistance to apoptosis in the liver. It's of great significance to explore the biosafety exposure limits and action mechanisms of GP. This study detected the global DNA methylation microenvironment and the regulation of specific genes in GP against cellular apoptosis induced by hydrogen peroxide (H2O2) of human hepatocyte L-02 cells. The half inhibitory concentration (IC50) of GP on normal L-02 cells was 57.7 mg/mL. GP exerted new epigenetic activity, increased DNMT1, decreased TET1 and TET2 expression, and reversed the demethylation effect to some extent, thereby increasing the overall genomic DNA methylation level at the concentration of 900 μg/mL. GP pretreatment could also adjust the level of P53, Bcl-2 and AKT altered by H2O2, reducing their specific DNA methylation levels in the promoter regions of AKT and Bcl-2 to inhibit apoptosis. Taken together, GP regulates the global DNA methylation level and controls the expression changes of P53, Bcl-2 and AKT, jointly inhibiting the occurrence of apoptosis in human hepatocytes and providing the newly theoretical references for its safety evaluation.
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Affiliation(s)
- Xinyue Peng
- Food Safety and Health Research Center, School of Public Health, NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Southern Medical University, Guangzhou 510515, PR China; Department of Public Health and Preventive Medicine, School of Medicine, Jinan University, Guangzhou, Guangdong, 510632, PR China
| | - Luyi Tan
- Department of Public Health and Preventive Medicine, School of Medicine, Jinan University, Guangzhou, Guangdong, 510632, PR China
| | - Jia Song
- Food Safety and Health Research Center, School of Public Health, NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Southern Medical University, Guangzhou 510515, PR China
| | - Yuefei Lai
- Food Safety and Health Research Center, School of Public Health, NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Southern Medical University, Guangzhou 510515, PR China
| | - Susu Yu
- Department of Public Health and Preventive Medicine, School of Medicine, Jinan University, Guangzhou, Guangdong, 510632, PR China
| | - Feifei Xu
- Food Safety and Health Research Center, School of Public Health, NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Southern Medical University, Guangzhou 510515, PR China
| | - Qinzhi Wei
- Food Safety and Health Research Center, School of Public Health, NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Southern Medical University, Guangzhou 510515, PR China
| | - Zhini He
- Food Safety and Health Research Center, School of Public Health, NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Southern Medical University, Guangzhou 510515, PR China
| | - Wenli Cheng
- Department of Public Health and Preventive Medicine, School of Medicine, Jinan University, Guangzhou, Guangdong, 510632, PR China
| | - Wenjuan Zhang
- Department of Public Health and Preventive Medicine, School of Medicine, Jinan University, Guangzhou, Guangdong, 510632, PR China.
| | - Xingfen Yang
- Food Safety and Health Research Center, School of Public Health, NMPA Key Laboratory for Safety Evaluation of Cosmetics, Guangdong Provincial Key Laboratory of Tropical Disease Research, Southern Medical University, Guangzhou 510515, PR China.
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Ren X, Ruan J, Lan X, Yang S, Wu D, Huang X, Zhang H, Liu J, Huang H. SET-mediated epigenetic dysregulation of p53 impairs trichloroethylene-induced DNA damage response. Toxicol Lett 2023; 387:76-83. [PMID: 37769858 DOI: 10.1016/j.toxlet.2023.09.008] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2023] [Revised: 09/13/2023] [Accepted: 09/19/2023] [Indexed: 10/03/2023]
Abstract
Trichloroethylene (TCE) was a widely used industrial solvent, and now has become a major environmental pollutant. Exposure to TCE has been found to result in significant damage to the liver, leading to hepatic toxicity. In our previous study, we discovered that a histone chaperon called SET plays a crucial role in mediating the DNA damage and apoptosis caused by TCE in hepatic cells. However, the precise function of SET in the response to DNA damage is still not fully understood. In this study, we evaluated TCE-induced DNA damage of hepatic L-02 cells with SET-knockdown, then analyzed alterations of H3K79me3 and p53 in hepatic cells and carcinogenic mice livers. Results suggested that SET interferes with DNA response via mediating down-regulation of p53 and partially suppressing H3K79me3 under treatment of TCE. To further verify the regulatory cascade, H3K79me3 was reduced and p53 was knocked down in L-02 cells respectively, and extent of DNA damage was evaluated. Reduced H3K79me3 was found leading to down-regulation of p53 which further exacerbated TCE-induced DNA injury. These findings demonstrated that SET-H3K79me3-p53 served as an epigenetic regulatory axis involved in TCE-induced DNA damage response.
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Affiliation(s)
- Xiaohu Ren
- Shenzhen Key Laboratory of Modern Toxicology, Shenzhen Medical Key Discipline of Health Toxicology (2020-2024), Shenzhen Center for Disease Control and Prevention, No 8 Longyuan Road, Nanshan District, Shenzhen 518055, China
| | - Jiawen Ruan
- Shenzhen Nanshan Center for Disease Control and Prevention (current under-employment)
| | - Xuerao Lan
- Department of Toxicology, School of Public Health, Sun Yat-sen University, Guangzhou 510080, China
| | - Sixia Yang
- Shenzhen Key Laboratory of Modern Toxicology, Shenzhen Medical Key Discipline of Health Toxicology (2020-2024), Shenzhen Center for Disease Control and Prevention, No 8 Longyuan Road, Nanshan District, Shenzhen 518055, China
| | - Desheng Wu
- Shenzhen Key Laboratory of Modern Toxicology, Shenzhen Medical Key Discipline of Health Toxicology (2020-2024), Shenzhen Center for Disease Control and Prevention, No 8 Longyuan Road, Nanshan District, Shenzhen 518055, China
| | - Xinfeng Huang
- Shenzhen Key Laboratory of Modern Toxicology, Shenzhen Medical Key Discipline of Health Toxicology (2020-2024), Shenzhen Center for Disease Control and Prevention, No 8 Longyuan Road, Nanshan District, Shenzhen 518055, China
| | - Hongyu Zhang
- Shenzhen Key Laboratory of Modern Toxicology, Shenzhen Medical Key Discipline of Health Toxicology (2020-2024), Shenzhen Center for Disease Control and Prevention, No 8 Longyuan Road, Nanshan District, Shenzhen 518055, China
| | - Jianjun Liu
- Shenzhen Key Laboratory of Modern Toxicology, Shenzhen Medical Key Discipline of Health Toxicology (2020-2024), Shenzhen Center for Disease Control and Prevention, No 8 Longyuan Road, Nanshan District, Shenzhen 518055, China.
| | - Haiyan Huang
- Shenzhen Key Laboratory of Modern Toxicology, Shenzhen Medical Key Discipline of Health Toxicology (2020-2024), Shenzhen Center for Disease Control and Prevention, No 8 Longyuan Road, Nanshan District, Shenzhen 518055, China.
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Kefayati F, Karimi Babaahmadi A, Mousavi T, Hodjat M, Abdollahi M. Epigenotoxicity: a danger to the future life. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART A, TOXIC/HAZARDOUS SUBSTANCES & ENVIRONMENTAL ENGINEERING 2023; 58:382-411. [PMID: 36942370 DOI: 10.1080/10934529.2023.2190713] [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: 10/10/2022] [Revised: 02/17/2023] [Accepted: 02/21/2023] [Indexed: 06/18/2023]
Abstract
Environmental toxicants can regulate gene expression in the absence of DNA mutations via epigenetic mechanisms such as DNA methylation, histone modifications, and non-coding RNAs' (ncRNAs). Here, all three epigenetic modifications for seven important categories of diseases and the impact of eleven main environmental factors on epigenetic modifications were discussed. Epigenetic-related mechanisms are among the factors that could explain the root cause of a wide range of common diseases. Its overall impression on the development of diseases can help us diagnose and treat diseases, and besides, predict transgenerational and intergenerational effects. This comprehensive article attempted to address the relationship between environmental factors and epigenetic modifications that cause diseases in different categories. The studies main gap is that the precise role of environmentally-induced epigenetic alterations in the etiology of the disorders is unknown; thus, still more well-designed researches need to be accomplished to fill this gap. The present review aimed to first summarize the adverse effect of certain chemicals on the epigenome that may involve in the onset of particular disease based on in vitro and in vivo models. Subsequently, the possible adverse epigenetic changes that can lead to many human diseases were discussed.
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Affiliation(s)
- Farzaneh Kefayati
- Toxicology and Diseases Group (TDG), Pharmaceutical Sciences Research Center (PSRC), Tehran University of Medical Sciences, Tehran, Iran
- Department of Toxicology and Pharmacology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
| | - Atoosa Karimi Babaahmadi
- Toxicology and Diseases Group (TDG), Pharmaceutical Sciences Research Center (PSRC), Tehran University of Medical Sciences, Tehran, Iran
- Department of Toxicology and Pharmacology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
| | - Taraneh Mousavi
- Toxicology and Diseases Group (TDG), Pharmaceutical Sciences Research Center (PSRC), Tehran University of Medical Sciences, Tehran, Iran
- Department of Toxicology and Pharmacology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
| | - Mahshid Hodjat
- Toxicology and Diseases Group (TDG), Pharmaceutical Sciences Research Center (PSRC), Tehran University of Medical Sciences, Tehran, Iran
- Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Mohammad Abdollahi
- Toxicology and Diseases Group (TDG), Pharmaceutical Sciences Research Center (PSRC), Tehran University of Medical Sciences, Tehran, Iran
- Department of Toxicology and Pharmacology, Faculty of Pharmacy, Tehran University of Medical Sciences, Tehran, Iran
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Peng X, Yu S, Lin H, Wu F, Yang J, Zhou C, Zhang L, Yang J, Zhang W. Time-concentration-dependent profile of histone modifications on human hepatocytes treated by trichloroacetic acid. INTERNATIONAL JOURNAL OF ENVIRONMENTAL HEALTH RESEARCH 2022; 32:2376-2384. [PMID: 34365848 DOI: 10.1080/09603123.2021.1964448] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2021] [Accepted: 08/01/2021] [Indexed: 06/13/2023]
Abstract
Trichloroacetic acid (TCA) is a common non-volatile by-product of chlorination disinfection for drinking water. It is necessary to know the epigenetic toxicity and mechanisms for establishing safe exposure limit for environmental TCA exposure. This study explored the histone modification variations of TCA-treated human hepatocytes L-02 at different time and concentrations. TCA (0.1 mM, 0.3 mM and 0.9 mM) had an inhibitory effect on the growth of L-02 cells, with no significant changes in morphology. Treated with TCA for 24 h and 48 h, L-02 cells showed decreased mRNA and protein level of histone deacetylases (HDACs), but increased after 72 h. The downregulation of HDACs in early stage of TCA exposure might be one of the important reasons for the increase of H3K9ac level. These changes of histone modification may serve as early epigenetic biomarkers for TCA exposure and the related diseases, offering the safe environmental exposure concentration reference.
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Affiliation(s)
- Xinyue Peng
- Department of Public Health and Preventive Medicine, School of Medicine, Jinan University, Guangzhou, P.R. China
| | - Susu Yu
- Department of Public Health and Preventive Medicine, School of Medicine, Jinan University, Guangzhou, P.R. China
| | - Hui Lin
- Department of Radiation Oncology, Guangdong Provincial People's Hospital & Guangdong Academy of Medical Sciences, Guangzhou, P. R. China
| | - Fan Wu
- Department of Public Health and Preventive Medicine, School of Medicine, Jinan University, Guangzhou, P.R. China
| | - Jiani Yang
- Department of Public Health and Preventive Medicine, School of Medicine, Jinan University, Guangzhou, P.R. China
| | - Cheng Zhou
- Department of Public Health and Preventive Medicine, School of Medicine, Jinan University, Guangzhou, P.R. China
| | - Luyun Zhang
- Department of Public Health and Preventive Medicine, School of Medicine, Jinan University, Guangzhou, P.R. China
| | - Jianping Yang
- Department of Occupational Health, Shenzhen Boruikang Tech. Co., Ltd, Shenzhen, P. R. China
| | - Wenjuan Zhang
- Department of Public Health and Preventive Medicine, School of Medicine, Jinan University, Guangzhou, P.R. China
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Banerjee N, Wang H, Wang G, Boor PJ, Khan MF. Differential Expression of miRNAs in Trichloroethene-Mediated Inflammatory/Autoimmune Response and Its Modulation by Sulforaphane: Delineating the Role of miRNA-21 and miRNA-690. Front Immunol 2022; 13:868539. [PMID: 35422807 PMCID: PMC9001960 DOI: 10.3389/fimmu.2022.868539] [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] [Received: 02/10/2022] [Accepted: 02/28/2022] [Indexed: 11/13/2022] Open
Abstract
Trichloroethene (TCE), an occupational and ubiquitous environmental contaminant, is associated with the induction of autoimmune diseases (ADs). Although oxidative stress plays a major role in TCE-mediated autoimmunity, the underlying molecular mechanisms still need to be delineated. Altered non-coding RNAs, including the expression of microRNAs (miRNAs), can influence target genes, especially related to apoptosis and inflammation, and contribute to ADs. Therefore, the objective of this study was to delineate the contribution of miRNAs in TCE-mediated inflammatory and autoimmune response. To achieve this, we treated female MRL+/+ mice with TCE (10 mmol/kg in corn oil, i.p., every fourth day) with/without antioxidant sulforaphane (SFN; 8 mg/kg in corn oil, i.p., every other day) for 6 weeks. With the use of miRNA microarray, 293 miRNAs were analyzed, which included 35 miRNAs that were relevant to inflammation and ADs. Among those 35 miRNAs, 8 were modulated by TCE and/or TCE+SFN exposure. TCE treatment led to increased expression of 3 miRNAs and also decreased expression of 3 miRNAs. Interestingly, among the 35 differentially expressed miRNAs, antioxidant SFN modulated the expression of 6 miRNAs. Based on the microarray findings, we subsequently focused on two miRNAs (miRNA-21 and miRNA-690), which are known to be involved in inflammation and autoimmune response. The increases in miRNA-21 and miR-690 (observed using miRNA microarray) were further validated by RT-PCR, and the TCE-mediated increases in miR-21 and miR-690 were ameliorated by SFN treatment. Modulating miR-21 and miR-690 by respective inhibitors or mimics suppressed the expression of NF-κB (p65) and IL-12 in RAW 264.7 cells. Our findings suggest a contributory role of miR-21 and miR-690 in TCE-mediated and its metabolite dichloroacetyl chloride (DCAC)-mediated inflammation and autoimmune response and support that antioxidant SFN could be a potential therapeutic candidate for inflammatory responses and ADs.
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Affiliation(s)
- Nivedita Banerjee
- Department of Pathology, University of Texas Medical Branch, Galveston, TX, United States
| | - Hui Wang
- Department of Pathology, University of Texas Medical Branch, Galveston, TX, United States
| | - Gangduo Wang
- Department of Pathology, University of Texas Medical Branch, Galveston, TX, United States
| | - Paul J Boor
- Department of Pathology, University of Texas Medical Branch, Galveston, TX, United States
| | - M Firoze Khan
- Department of Pathology, University of Texas Medical Branch, Galveston, TX, United States
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Goodman S, Chappell G, Guyton KZ, Pogribny IP, Rusyn I. Epigenetic alterations induced by genotoxic occupational and environmental human chemical carcinogens: An update of a systematic literature review. MUTATION RESEARCH. REVIEWS IN MUTATION RESEARCH 2022; 789:108408. [PMID: 35690411 PMCID: PMC9188653 DOI: 10.1016/j.mrrev.2021.108408] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/30/2021] [Revised: 10/28/2021] [Accepted: 12/07/2021] [Indexed: 01/03/2023]
Abstract
Epigenetic alterations, such as changes in DNA methylation, histones/chromatin structure, nucleosome positioning, and expression of non-coding RNAs, are recognized among key characteristics of carcinogens; they may occur independently or concomitantly with genotoxic effects. While data on genotoxicity are collected through standardized guideline tests, data collected on epigenetic effects is far less uniform. In 2016, we conducted a systematic review of published studies of genotoxic carcinogens that reported epigenetic endpoints to better understand the evidence for epigenetic alterations of human carcinogens, and the potential association with genotoxic endpoints. Since then, the number of studies of epigenetic effects of chemicals has nearly doubled. This review stands as an update on epigenetic alterations induced by occupational and environmental human carcinogens that were previously and recently classified as Group 1 by the International Agency for Research on Cancer. We found that the evidence of epigenetic effects remains uneven across agents. Studies of DNA methylation are most abundant, while reports concerning effects on non-coding RNA have increased over the past 5 years. By contrast, mechanistic toxicology studies of histone modifications and chromatin state alterations remain few. We found that most publications of epigenetic effects of carcinogens were studies in exposed humans or human cells. Studies in rodents represent the second most common species used for epigenetic studies in toxicology, in vivo exposures being the most predominant. Future studies should incorporate dose- and time-dependent study designs and also investigate the persistence of effects following cessation of exposure, considering the dynamic nature of most epigenetic alterations.
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Affiliation(s)
- Samantha Goodman
- Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, TX, USA
| | | | | | - Igor P Pogribny
- National Center for Toxicological Research, US Food and Drug Administration, Jefferson, AR, USA
| | - Ivan Rusyn
- Department of Veterinary Integrative Biosciences, Texas A&M University, College Station, TX, USA.
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Liu Y, Chen H, Zhao L, Li Z, Yi X, Guo T, Cao X. Enhanced trichloroethylene biodegradation: Roles of biochar-microbial collaboration beyond adsorption. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 792:148451. [PMID: 34157525 DOI: 10.1016/j.scitotenv.2021.148451] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 06/09/2021] [Accepted: 06/10/2021] [Indexed: 06/13/2023]
Abstract
Trichloroethylene (TCE) is a pollutant widely found in groundwater, especially in the heavily contaminated industrial sites. Biological dechlorination method is environmentally friendly and low-cost. However, microorganisms grow slowly and their activity is susceptible to environmental fluctuations. This study used biochar as an additive to promote anaerobic biodegradation of TCE with mixed culture. Results showed that biochar with dose of 0.1-0.4% (w/v) brought a rapid initial decrease of TCE concentration by 39.4-88.8% in 24 h via adsorption mechanism. Biochar produced at 500 °C pyrolysis temperature (BC500) achieved the highest TCE adsorption in comparison to BC300 and BC700. Subsequently, a significantly shortened microbial stagnation phase (from 85 h to 37 h) was observed in the system with the presence of biochar. During the exponential growth phase, BC700 outperformed BC300 and BC500 in terms of TCE degradation efficiency. Electrochemical analysis demonstrated that BC700 possessed the greatest electron transfer capability. Finally, biochar shortened the time for achieving 100% removal of TCE by 54.5-69.7% (from approximate 330 h to 100-150 h). Even at high concentration of TCE (20-30 mg·L-1) that could lead to serious microbial growth inhibition, the TCE degradation efficiency could be recovered in the presence of BC500. The high-throughput sequencing data revealed that biochar promoted the relative abundance of co-metabolizing dechlorinating microorganisms (Pseudomonas, Burkholderia) in the aqueous solution, and simultaneously led to the selective colonization of reductive dechlorinating microorganisms (Enterobacteriaceae, Clostridium) attached on biochar surface. On the other hand, biochar addition decreased the relative abundance of hydrogen-competing microorganisms, thereby forming an efficient co-metabolism-reductive dechlorination system. These findings allow a better understanding of the promotion mechanism of biochar for microbial dechlorination technology supporting the biochar-assisted bioremediation in practice.
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Affiliation(s)
- Yang Liu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Hao Chen
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Ling Zhao
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai 201306, China.
| | - Zhaopeng Li
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xionghai Yi
- Shanghai Customs District P. R. China, Minsheng Road No. 1208, Shanghai 200135, China
| | - Tianbao Guo
- Hebei Xiongan Mairong Environmental Protection Co. Ltd, Xiongan 071000, China
| | - Xinde Cao
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China; China-UK Low Carbon College, Shanghai Jiao Tong University, Shanghai 201306, China
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