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Jalili C, Ranjbar Shamsi R, Amiri B, Kakebaraie S, Jalili F, Nasta TZ. Genotoxic and cytotoxic effects of aflatoxin on the reproductive system: Focus on cell cycle dynamics and apoptosis in testicular tissue. Toxicology 2024; 504:153773. [PMID: 38484789 DOI: 10.1016/j.tox.2024.153773] [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: 01/11/2024] [Revised: 03/09/2024] [Accepted: 03/11/2024] [Indexed: 03/24/2024]
Abstract
Aflatoxins (AFs) are inevitable environmental contaminants that are detrimental to human and animal health. AFs interfere with metabolic processes, metabolizing into different hydroxylated derivatives in the liver, as well as mechanistically induce ROS accumulation, S-phase arrest, DNA damage, and cell apoptosis. Chronic consumption of aflatoxin-contaminated foods can adversely affect the male reproductive system, cause testicular damage, prevent testosterone synthesis, decline sperm quality, and cause infertility. Oxidative stress is the fundamental pathogenesis of aflatoxin-induced reproductive toxicity. The overproduction of reactive oxygen substances can cause testicular failure and disturb the process of spermatogenesis. Mitochondria are susceptible to being impaired by oxidative stress, and its damage is associated with infertility. AFs also disturb the process of spermatogenesis by disrupting the regulation of genes related to the progression of the cell cycle such as cyclins and inducing genes related to apoptosis, thereby weakening fertility and negatively affecting the testicular endocrine potential by suppressing androgen synthesis. Additionally, AFs downregulate ERα expression, potentially negatively impacting spermatogenesis by enhancing the apoptotic mechanism. In this review, we provide new insights into the genotoxic and cytotoxic effects of AFB1 on the male reproductive system with a focus on the cell cycle and apoptosis destruction of testicular tissue.
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Affiliation(s)
- Cyrus Jalili
- Medical Biology Research Center, Health Technology Institute, Kermanshah University of Medical Sciences, Kermanshah, Islamic Republic of Iran
| | - Rahele Ranjbar Shamsi
- Department of Clinical Biochemistry, Faculty of Veterinary Medicine, Tabriz, Islamic Republic of Iran
| | - Bita Amiri
- Department of Chemistry and Biochemistry, University of Texas at Arlington, TX, USA
| | - Seyran Kakebaraie
- Medical Biology Research Center, Health Technology Institute, Kermanshah University of Medical Sciences, Kermanshah, Islamic Republic of Iran
| | - Faramarz Jalili
- School of Health Administration, Faculty of Health, Dalhousie University, Halifax, NS, Canada
| | - Touraj Zamir Nasta
- Medical Biology Research Center, Health Technology Institute, Kermanshah University of Medical Sciences, Kermanshah, Islamic Republic of Iran.
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Wang H, Fan Q, Liang Q, Wu Y, Ye Z, Wu H, Sun Q, Tang H, Liu Y, Liu Q, Chen Y. Human CYP1A1-activated aneugenicity of aflatoxin B1 in mammalian cells and its combined effect with benzo(a)pyrene. Chem Biol Interact 2024; 392:110923. [PMID: 38382706 DOI: 10.1016/j.cbi.2024.110923] [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: 11/01/2023] [Revised: 01/31/2024] [Accepted: 02/18/2024] [Indexed: 02/23/2024]
Abstract
Aflatoxin B1 (AFB1) is the most toxic mycotoxin and a proven human carcinogen that requires metabolic activation, known by cytochrome P450 (CYP) 1A2 and 3A4. Previous evidence showed that AFB1 is activated by human recombinant CYP1A1 expressed in budding yeast. Yet, the toxicity, in particular the genotoxicity of the reactive metabolites formed from AFB1 remains unclear. Humans could be exposed to both AFB1 and benzo(a)pyrene (BaP) simultaneously, thus we were interested in their combined genotoxic effects subsequent to metabolic activation by CYP1A1. In this study, molecular docking of AFB1 to human CYP1A1 indicated that AFB1 is valid as a substrate. In the incubations with AFB1 in human CYP1A1-expressed microsomes, AFM1 as a marking metabolite of AFB1 was detected. Moreover, AFB1 induced micronucleus formation in a Chinese hamster V79-derived cell line and in a human lung epithelial BEAS-2B cell line, both expressing recombinant human CYP1A1, V79-hCYP1A1 and 2B-hCYP1A1 cells, respectively. Immunofluorescence of centromere protein B stained micronuclei was dominant in AFB1-treated BEAS-2B cells exposed to AFB1, suggesting an aneugenic effect. Moreover, AFB1 elevated the levels of ROS, 8-OHdG, AFB1-DNA adduct, and DNA breaks in 2B-hCYP1A1 cells, compared with those in the parental BEAS-2B cells. Meanwhile, AFB1 increased CYP1A1, RAD51, and γ-H2AX protein levels in 2B-hCYP1A1 cells, which were attenuated by the CYP1A1 inhibitor bergamottin. Co-exposure of AFB1 with BaP increased 8-OHdG, RAD51, and γ-H2AX levels (indicating DNA damage). In conclusion, AFB1 could be activated by human CYP1A1 for potent aneugenicity, which may be further enhanced by co-exposure to BaP.
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Affiliation(s)
- Huanhuan Wang
- Dongguan Key Laboratory of Environmental Medicine, The First Dongguan Affiliated Hospital, School of Public Health, Guangdong Medical University, Dongguan, 523808, China
| | - Qin Fan
- Dongguan Key Laboratory of Environmental Medicine, The First Dongguan Affiliated Hospital, School of Public Health, Guangdong Medical University, Dongguan, 523808, China
| | - Qian Liang
- Dongguan Key Laboratory of Environmental Medicine, The First Dongguan Affiliated Hospital, School of Public Health, Guangdong Medical University, Dongguan, 523808, China
| | - Yao Wu
- Dongguan Key Laboratory of Environmental Medicine, The First Dongguan Affiliated Hospital, School of Public Health, Guangdong Medical University, Dongguan, 523808, China
| | - Zhongming Ye
- Dongguan Key Laboratory of Environmental Medicine, The First Dongguan Affiliated Hospital, School of Public Health, Guangdong Medical University, Dongguan, 523808, China
| | - Haipeng Wu
- Dongguan Key Laboratory of Environmental Medicine, The First Dongguan Affiliated Hospital, School of Public Health, Guangdong Medical University, Dongguan, 523808, China
| | - Qian Sun
- Dongguan Key Laboratory of Environmental Medicine, The First Dongguan Affiliated Hospital, School of Public Health, Guangdong Medical University, Dongguan, 523808, China
| | - Huanwen Tang
- Dongguan Key Laboratory of Environmental Medicine, The First Dongguan Affiliated Hospital, School of Public Health, Guangdong Medical University, Dongguan, 523808, China
| | - Yungang Liu
- Department of Toxicology, School of Public Health (Guangdong Provincial Key Laboratory of Tropical Disease Research), Southern Medical University, Guangzhou, 510515, China
| | - Qizhan Liu
- Dongguan Key Laboratory of Environmental Medicine, The First Dongguan Affiliated Hospital, School of Public Health, Guangdong Medical University, Dongguan, 523808, China; Center for Global Health, The Key Laboratory of Modern Toxicology, Ministry of Education, School of Public Health, Nanjing Medical University, Nanjing, 211166, Jiangsu, China.
| | - Yuting Chen
- Dongguan Key Laboratory of Environmental Medicine, The First Dongguan Affiliated Hospital, School of Public Health, Guangdong Medical University, Dongguan, 523808, China.
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Jarrar YB, Ashour W, Madani A, Jarrar Q, Abulebdah D, Jamous YF, Labban SY, Tazkarji M. Maternal separation influences hepatic drug-metabolizing CYP450 gene expression without pathological changes in adult mice. J Basic Clin Physiol Pharmacol 2024; 35:85-91. [PMID: 38468541 DOI: 10.1515/jbcpp-2023-0250] [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: 12/07/2023] [Accepted: 02/26/2024] [Indexed: 03/13/2024]
Abstract
OBJECTIVES The principal motive of this study is to explore the influence maternal separation (MS) exhibits on the mRNA expression of major drug metabolizing-cyp450s in parallel with the assessment of pathological changes that can be induced by MS in the livers of experimental mice. METHODS Eighteen Balb/c mouse pups, comprising of both males and females, were separated from their mothers after birth. Following a six-week period during when the pups became adults, the mice were sacrificed and their livers were isolated for analysis of weight, pathohistological alterations, and the mRNA expression of drug metabolizing cyp450 genes: cyp1a1, cyp3a11, cyp2d9, and cyp2c29. RESULTS The study demonstrated that MS markedly downregulated (p<0.05) the mRNA expression of all tested drug-metabolizing cyp450s in livers of female and male mice. Furthermore, the mRNA levels of major drug-metabolizing cyp450s were notably lower (p<0.05) in livers of female MS mice as compared with male MS mice. It was found that values of the total body weight and liver weight of MS mice did not vary significantly (p>0.05) from those of the control groups. Additionally, histological examination revealed that the hepatic tissue of MS mice was normal, similar to that of the control mice. CONCLUSIONS In summary, MS downregulates the gene expression of major hepatic drug-metabolizing cyp450s without inducing pathological alterations in the livers of mice. These findings provide an explanation for the heterogeneity in pharmacokinetics and drug response of patients with early life stress.
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Affiliation(s)
- Yazun Bashir Jarrar
- Department of Basic Medical Sciences, Faculty of Medicine, 59303 Al-Balqa Applied University , Al-Salt, Jordan
| | - Walaa' Ashour
- Department of Pharmaceutical Science, College of Pharmacy, 84977 Al-Zaytoonah University of Jordan , Amman, Jordan
| | - Abdalla Madani
- Department of Pharmaceutical Science, College of Pharmacy, 84977 Al-Zaytoonah University of Jordan , Amman, Jordan
| | - Qais Jarrar
- Department of Pharmaceutical Sciences, Faculty of Pharmacy, 108564 Isra University , Amman, Jordan
| | - Dina Abulebdah
- Department of Pharmaceutical Science, College of Pharmacy, 84977 Al-Zaytoonah University of Jordan , Amman, Jordan
| | - Yahya F Jamous
- The National Center of Vaccines and Bioprocessing, 83527 King Abdulaziz City for Science and Technology (KACST) , Riyadh, Saudi Arabia
| | - Samah Y Labban
- Department of Physiology, Faculty of Medicine, 48058 Umm Al-Qura University , Makkah, Saudi Arabia
| | - Mariam Tazkarji
- Faculty of Science, 3710 McMaster University , Hamilton, ON, Canada
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Smiriglia A, Lorito N, Serra M, Perra A, Morandi A, Kowalik MA. Sex difference in liver diseases: How preclinical models help to dissect the sex-related mechanisms sustaining NAFLD and hepatocellular carcinoma. iScience 2023; 26:108363. [PMID: 38034347 PMCID: PMC10682354 DOI: 10.1016/j.isci.2023.108363] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/02/2023] Open
Abstract
Only a few preclinical findings are confirmed in the clinic, posing a critical issue for clinical development. Therefore, identifying the best preclinical models can help to dissect molecular and mechanistic insights into liver disease pathogenesis while being clinically relevant. In this context, the sex relevance of most preclinical models has been only partially considered. This is particularly significant in NAFLD and HCC, which have a higher prevalence in men when compared to pre-menopause women but not to those in post-menopausal status, suggesting a role for sex hormones in the pathogenesis of the diseases. This review gathers the sex-relevant findings and the available preclinical models focusing on both in vitro and in vivo studies and discusses the potential implications and perspectives of introducing the sex effect in the selection of the best preclinical model. This is a critical aspect that would help to tailor personalized therapies based on sex.
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Affiliation(s)
- Alfredo Smiriglia
- Department of Experimental and Clinical Biomedical Sciences, University of Florence, 50134 Florence, Italy
| | - Nicla Lorito
- Department of Experimental and Clinical Biomedical Sciences, University of Florence, 50134 Florence, Italy
| | - Marina Serra
- Department of Biomedical Sciences, University of Cagliari, 09042 Monserrato, Italy
| | - Andrea Perra
- Department of Biomedical Sciences, University of Cagliari, 09042 Monserrato, Italy
| | - Andrea Morandi
- Department of Experimental and Clinical Biomedical Sciences, University of Florence, 50134 Florence, Italy
| | - Marta Anna Kowalik
- Department of Biomedical Sciences, University of Cagliari, 09042 Monserrato, Italy
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Kumar LK, Verma SK, Chandel R, Thumar M, Singh D, Onteru SK. Aflatoxin M1 decreases the expression of genes encoding tight junction proteins and influences the intestinal epithelial integrity. Mycotoxin Res 2023; 39:453-467. [PMID: 37794205 DOI: 10.1007/s12550-023-00505-2] [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: 05/18/2023] [Revised: 09/10/2023] [Accepted: 09/12/2023] [Indexed: 10/06/2023]
Abstract
Aflatoxin M1 (AFM1) is a mycotoxin that is commonly found as a milk contaminant, and its presence in milk has been linked to cytotoxicity. The present study aimed to evaluate the acute cytotoxic effects of AFM1 on intestinal Caco-2 cells. Initially, we checked the morphology and viability of Caco-2 cells after treatment with different concentrations of AFM1 (5 ng/L, 50 ng/L, 250 ng/L, 500 ng/L, 1000 ng/L, and 2000 ng/L) for different time intervals (6 h, 12 h, and 24 h). It was found that AFM1 did not show any effect on cell morphology, but 10% decrease in viability above 1000 ng/L after 12 h. Furthermore, DCFDA assay showed increased ROS production after 6 h treatments. qPCR analysis showed an increased expression of epithelial-specific cytoskeleton marker genes, Cytokeratin, Villin, Vimentin, and JAM-1, and a decreased expression of tight junction protein genes, Claudin-1, Occludin, and ZO-1. Similarly, we found an increased expression of Cyp1a1 transcript with an increasing AFM1 concentration and incubation time. This gene expression analysis showed AFM1 can cause disruption of tight junctions between intestinal cells, which was further confirmed by a transwell experiment. In conclusion, consumption of AFM1-contaminated milk does not show any effect on cells morphology and viability but decreases the expression of intestinal barrier transcripts that may lead to the disruption of intestinal barrier function and leaky gut.
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Affiliation(s)
- Lal Krishan Kumar
- Molecular Endocrinology, Functional Genomics & System Biology Laboratory, Animal Biochemistry Division, ICAR-National Dairy Research Institute, Karnal (Haryana), India, 132001
| | - Surya Kant Verma
- Molecular Endocrinology, Functional Genomics & System Biology Laboratory, Animal Biochemistry Division, ICAR-National Dairy Research Institute, Karnal (Haryana), India, 132001
| | - Rajeev Chandel
- Molecular Endocrinology, Functional Genomics & System Biology Laboratory, Animal Biochemistry Division, ICAR-National Dairy Research Institute, Karnal (Haryana), India, 132001
| | - Meet Thumar
- Molecular Endocrinology, Functional Genomics & System Biology Laboratory, Animal Biochemistry Division, ICAR-National Dairy Research Institute, Karnal (Haryana), India, 132001
| | - Dheer Singh
- Molecular Endocrinology, Functional Genomics & System Biology Laboratory, Animal Biochemistry Division, ICAR-National Dairy Research Institute, Karnal (Haryana), India, 132001
| | - Suneel Kumar Onteru
- Molecular Endocrinology, Functional Genomics & System Biology Laboratory, Animal Biochemistry Division, ICAR-National Dairy Research Institute, Karnal (Haryana), India, 132001.
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Chen Y, Lu Z, Li B, Wang H, Jiang T, Xuan M, Yang H, Chen J, Liu X, Liang H, Liu Y, Tang H. Human CYP1B1 enzyme-mediated, AhR enhanced activation of aflatoxin B1 for its genotoxicity in human cells. Toxicol Lett 2023; 373:132-140. [PMID: 36442682 DOI: 10.1016/j.toxlet.2022.11.014] [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: 06/23/2022] [Revised: 11/02/2022] [Accepted: 11/21/2022] [Indexed: 11/27/2022]
Abstract
Aflatoxin B1 (AFB1) is a human procarcinogen known to be activated by cytochrome P450 (CYP) 1A2 and 3A4. In a previous study AFB1 caused chromosomal rearrangement in a yeast strain genetically engineered for stably expressing human CYP1B1. Yet, further verification of the effect of AFB1 in human cells, a potential role of the aryl hydrocarbon receptor (AhR), and CYP1B1-catalyzed AFB1 metabolism remain unidentified. In this study, a human hepatocyte (L-02) line and a human lymphoblastoid (TK6) cell line were genetically engineered for the expression of human CYP1B1, producing L-02-hCYP1B1 and TK6-hCYP1B1, respectively. They were exposed to AFB1 and analyzed for the formation of micronucleus and elevation of γ-H2AX (indicating double-strand DNA breaks); the metabolites formed by CYP1B1 from AFB1 after incubation of AFB1 with human CYP1B1 isoenzyme microsomes were determined by LC-MS. The results showed significantly more potent induction of micronucleus by AFB1 in L-02-hCYP1B1 and TK6-hCYP1B1 than in the parental (L-02 and TK6) cells, and the effects were reduced by (E)- 2,3',4,5'-tetramethoxystilbene, a specific CYP1B1 inhibitor. In the AFB1- CYP1B1 microsomes incubations AFM1, a known stable metabolite of AFB1, was detected. Moreover, in L-02 and TK6 cells, AFB1 apparently increased the protein levels of AhR, ANRT and CYP1B1, and caused the nuclear translocation of AhR and ARNT, the latter effect being blocked by BAY-218 (an inhibitor of AhR). In conclusion, this study indicates that human CYP1B1 is capable of metabolically activating AFB1 through the AhR signaling pathway.
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Affiliation(s)
- Yuting Chen
- The First Dongguan Affiliated Hospital, Guangdong Medical University, Dongguan 523808, China; Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Dongguan 523808, China
| | - Zhaohong Lu
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Dongguan 523808, China
| | - Boxin Li
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Dongguan 523808, China
| | - Huanhuan Wang
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Dongguan 523808, China
| | - Tikeng Jiang
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Dongguan 523808, China
| | - Mei Xuan
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Dongguan 523808, China
| | - Hui Yang
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Dongguan 523808, China
| | - Jialong Chen
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Dongguan 523808, China
| | - Xiaoshan Liu
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Dongguan 523808, China
| | - Hairong Liang
- Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Dongguan 523808, China
| | - Yungang Liu
- Department of Toxicology, School of Public Health (Guangdong Provincial Key Laboratory of Tropical Disease Research), Southern Medical University, Guangzhou 510515, China.
| | - Huanwen Tang
- The First Dongguan Affiliated Hospital, Guangdong Medical University, Dongguan 523808, China; Dongguan Key Laboratory of Environmental Medicine, School of Public Health, Guangdong Medical University, Dongguan 523808, China.
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Zhang X, Sun K, Wang X, Shi X, Gong D. Chlorpyrifos induces apoptosis and necroptosis via the activation of CYP450s pathway mediated by nuclear receptors in LMH cells. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:1060-1071. [PMID: 35908035 DOI: 10.1007/s11356-022-22285-5] [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: 04/13/2022] [Accepted: 07/25/2022] [Indexed: 06/15/2023]
Abstract
Chlorpyrifos (CPF), an organophosphorus pesticide, is detected commonly in environments, where it is thought to be highly toxic to non-target organisms. However, the mechanism of CYP450s pathway mediated by nuclear receptors on CPF-induced apoptosis and necroptosis at the cellular level and the effect of CPF on the cytotoxicity of the chicken hepatocarcinoma cell line (LMH) has also not been reported in detail. Therefore, this experiment aims to explore whether CPF can improve apoptosis and necroptosis in LMH cells by activating the nuclear receptors/CYP450s axis. LMH cells, the subject of this study, were exposed to 5 μg/mL, 10 μg/mL, and 15 μg/mL doses of CPF. With the increase of CPF concentration, the increase of nuclear receptor level led to the up-regulation of CYP450s activity. With the massive production of ROS, the expression of apoptotic pathway genes (Bax, Caspase9, and Caspase3) enhanced, while Bcl-2 expression dropped sharply. The expression of programmed necroptosis genes (RIPK1, RIPK3, and MLKL) heightened, and Caspase8 reduced considerably. In short, our data suggests that excessive activation of nuclear receptors and CYP450s induced by CPF promotes ROS production, which directs apoptosis and programmed necroptosis in LMH cells.
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Affiliation(s)
- Xinyu Zhang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, 150030, People's Republic of China
| | - Kexin Sun
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, 150030, People's Republic of China
| | - Xu Wang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, 150030, People's Republic of China
| | - Xu Shi
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, 150030, People's Republic of China
| | - Duqiang Gong
- College of Jilin Agricultural Science and Technology University, Jilin, 132101, People's Republic of China.
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8
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Begum TF, Carpenter D. Health effects associated with phthalate activity on nuclear receptors. REVIEWS ON ENVIRONMENTAL HEALTH 2022; 37:567-583. [PMID: 34592072 DOI: 10.1515/reveh-2020-0162] [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: 01/11/2021] [Accepted: 09/09/2021] [Indexed: 06/13/2023]
Abstract
Phthalates are endocrine disruptors, widely used as plasticizers to impart flexibility in plastics, and as solvents in personal care products. Due to their nearly ubiquitous use in consumer products, most humans are exposed to phthalates daily. There has been extensive research on the reproductive health effects associated with phthalate exposure, but less attention has been paid to other actions. This review aims to summarize the known action of phthalates on different nuclear receptors. Some phthalates bind to and activate the estrogen receptor, making them weakly estrogenic. However, other phthalates antagonize androgen receptors. Some high molecular weight phthalates antagonize thyroid receptors, affecting metabolism. Several phthalates activate and interfere with the normal function of different peroxisome proliferator-activated receptors (PPARs), receptors that have critical roles in lipid metabolism and energy homeostasis. Some phthalates activate the aryl hydrocarbon receptor, which is critical for xenobiotic metabolism. Although phthalates have a short half-life in vivo, because people are continuously exposed, studies should examine the health effects of phthalates associated with long-term exposure. There is limited research on the effects of phthalates on health outcomes aside from reproductive function, particularly concerning are childhood adiposity, behavior, and learning. There is also limited information on actions of phthalates not mediated via nuclear receptors. Humans are exposed to multiple chemicals simultaneously, and how chemical mixtures act on nuclear receptor activity needs study. Although we know a great deal about phthalates, there is still much that remains uncertain. Future studies need to further examine their other potential health effects.
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Affiliation(s)
- Thoin Farzana Begum
- Department of Environmental Health Sciences, School of Public Health, University at Albany, Rensselaer, NY, USA
| | - David Carpenter
- Department of Environmental Health Sciences, School of Public Health, University at Albany, Rensselaer, NY, USA
- Institute for Health and the Environment, University at Albany, Rensselaer, NY, USA
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Lootens O, Vermeulen A, Croubels S, De Saeger S, Van Bocxlaer J, De Boevre M. Possible Mechanisms of the Interplay between Drugs and Mycotoxins-Is There a Possible Impact? Toxins (Basel) 2022; 14:toxins14120873. [PMID: 36548770 PMCID: PMC9787578 DOI: 10.3390/toxins14120873] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Revised: 12/07/2022] [Accepted: 12/13/2022] [Indexed: 12/15/2022] Open
Abstract
Mycotoxin contamination is a global food safety issue leading to major public health concerns. Repeated exposure to multiple mycotoxins not only has repercussions on human health but could theoretically also lead to interactions with other xenobiotic substances-such as drugs-in the body by altering their pharmacokinetics and/or pharmacodynamics. The combined effects of chronic drug use and mycotoxin exposure need to be well understood in order to draw valid conclusions and, in due course, to develop guidelines. The aim of this review is to focus on food contaminants, more precisely on mycotoxins, and drugs. First, a description of relevant mycotoxins and their effects on human health and metabolism is presented. The potential for interactions of mycotoxins with drugs using in vitro and in vivo animal experiments is summarized. Predictive software tools for unraveling mycotoxin-drug interactions are proposed and future perspectives on this emerging topic are highlighted with a view to evaluate associated risks and to focus on precision medicine. In vitro and in vivo animal studies have shown that mycotoxins affect CYP450 enzyme activity. An impact from drugs on mycotoxins mediated via CYP450-enzymes is plausible; however, an impact of mycotoxins on drugs is less likely considering the much smaller dose exposure to mycotoxins. Drugs that are CYP450 perpetrators and/or substrates potentially influence the metabolism of mycotoxins, metabolized via these CYP450 enzymes. To date, very little research has been conducted on this matter. The only statistically sound reports describe mycotoxins as victims and drugs as perpetrators in interactions; however, more analysis on mycotoxin-drug interactions needs to be performed.
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Affiliation(s)
- Orphélie Lootens
- Centre of Excellence in Mycotoxicology and Public Health, Department of Bioanalysis, Faculty of Pharmaceutical Sciences, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium
- Laboratory of Medical Biochemistry and Clinical Analysis, Department of Bioanalysis, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium
- MYTOX-SOUTH, International Thematic Network, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium
- Correspondence: (O.L.); (M.D.B.)
| | - An Vermeulen
- Laboratory of Medical Biochemistry and Clinical Analysis, Department of Bioanalysis, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium
| | - Siska Croubels
- MYTOX-SOUTH, International Thematic Network, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium
- Laboratory of Pharmacology and Toxicology, Department of Pathobiology, Pharmacology and Zoological Medicine, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, 9820 Merelbeke, Belgium
| | - Sarah De Saeger
- Centre of Excellence in Mycotoxicology and Public Health, Department of Bioanalysis, Faculty of Pharmaceutical Sciences, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium
- MYTOX-SOUTH, International Thematic Network, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium
- Department of Food Technology, Faculty of Science, University of Johannesburg, Doornfontein Campus, P.O. Box 17011, Gauteng 2028, South Africa
| | - Jan Van Bocxlaer
- Laboratory of Medical Biochemistry and Clinical Analysis, Department of Bioanalysis, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium
| | - Marthe De Boevre
- Centre of Excellence in Mycotoxicology and Public Health, Department of Bioanalysis, Faculty of Pharmaceutical Sciences, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium
- MYTOX-SOUTH, International Thematic Network, Ghent University, Ottergemsesteenweg 460, 9000 Ghent, Belgium
- Correspondence: (O.L.); (M.D.B.)
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Meinan X, Yimeng W, Chao W, Tianli T, Li J, Peng Y, Xiangping N. Response of the Sirtuin/PXR signaling pathway in Mugilogobius chulae exposed to environmentally relevant concentration Paracetamol. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2022; 249:106222. [PMID: 35728459 DOI: 10.1016/j.aquatox.2022.106222] [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: 04/12/2022] [Revised: 06/09/2022] [Accepted: 06/10/2022] [Indexed: 06/15/2023]
Abstract
Paracetamol (APAP) is one of the most widely used non-steroidal anti-inflammatory drugs, which is frequently detected in various water bodies. Studies are limited about its toxic effects and mechanisms on non-target aquatic organisms. In this study, an estuarine bottom-dwelling fish named Mugilogobius chulae, distributed in southern China, was selected as experimental species and the changes of PXR signaling pathway, a key signaling pathway of detoxification metabolic system in liver, were investigated under APAP exposure (0.5 μg·L-1, 5 μg·L-1, 50 μg·L-1 and 500 μg·L-1) for 24 h, 72 h and 168 h. Results showed that the key genes (e.g., P-gp, MRP1, CYP1A, CYP3A, GST and SULT) and the enzymatic activities of GST, EROD and ERND in PXR signaling pathway were induced to meet the requirements of detoxification metabolism. By up-regulating the expression of GCLC gene, the reductive small molecule GSH can be rapidly synthesized to counteract the attack of free radicals produced by APAP exposure. The expressions of SIRT1 and SIRT2 proteins decreased, while the expressions of most genes in PXR signaling pathway increased. It was speculated that the expression of PXR and its downstream target genes may be regulated epigenetically by SIRT1 and SIRT2. Studies showed that the exposure to environmental relevant concentrations of APAP can affect the detoxification metabolism of non-target organisms such as Mugilogobius chulae.
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Affiliation(s)
- Xie Meinan
- Department of Ecology, Jinan University, Guangzhou, 510632, China
| | - Wang Yimeng
- Department of Ecology, Jinan University, Guangzhou, 510632, China
| | - Wang Chao
- Department of Ecology, Jinan University, Guangzhou, 510632, China
| | - Tang Tianli
- Department of Ecology, Jinan University, Guangzhou, 510632, China
| | - Jianjun Li
- Guangdong Laboratory Animals Monitoring Institute, Guangzhou, 510663, China
| | - Ying Peng
- Research and Development Center for Watershed Environmental Eco-Engineering, Beijing Normal University, Zhuhai, China
| | - Nie Xiangping
- Department of Ecology, Jinan University, Guangzhou, 510632, China.
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11
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Iori S, Pauletto M, Bassan I, Bonsembiante F, Gelain ME, Bardhi A, Barbarossa A, Zaghini A, Dacasto M, Giantin M. Deepening the Whole Transcriptomics of Bovine Liver Cells Exposed to AFB1: A Spotlight on Toll-like Receptor 2. Toxins (Basel) 2022; 14:toxins14070504. [PMID: 35878242 PMCID: PMC9323327 DOI: 10.3390/toxins14070504] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 07/12/2022] [Accepted: 07/16/2022] [Indexed: 12/13/2022] Open
Abstract
Aflatoxin B1 (AFB1) is a food contaminant metabolized mostly in the liver and leading to hepatic damage. Livestock species are differently susceptible to AFB1, but the underlying mechanisms of toxicity have not yet been fully investigated, especially in ruminants. Thus, the aim of the present study was to better characterize the molecular mechanism by which AFB1 exerts hepatotoxicity in cattle. The bovine fetal hepatocyte cell line (BFH12) was exposed for 48 h to three different AFB1 concentrations (0.9 µM, 1.8 µM and 3.6 µM). Whole-transcriptomic changes were measured by RNA-seq analysis, showing significant differences in the expression of genes mainly involved in inflammatory response, oxidative stress, drug metabolism, apoptosis and cancer. As a confirmatory step, post-translational investigations on genes of interest were implemented. Cell death associated with necrosis rather than apoptosis events was noted. As far as the toxicity mechanism is concerned, a molecular pathway linking inflammatory response and oxidative stress was postulated. Toll-Like Receptor 2 (TLR2) activation, consequent to AFB1 exposure, triggers an intracellular signaling cascade involving a kinase (p38β MAPK), which in turn allows the nuclear translocation of the activator protein-1 (AP-1) and NF-κB, finally leading to the release of pro-inflammatory cytokines. Furthermore, a p38β MAPK negative role in cytoprotective genes regulation was postulated. Overall, our investigations improved the actual knowledge on the molecular effects of this worldwide relevant natural toxin in cattle.
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Affiliation(s)
- Silvia Iori
- Department of Comparative Biomedicine and Food Science, University of Padua, Viale dell’Università 16, Legnaro, 35020 Padua, Italy; (S.I.); (M.P.); (I.B.); (F.B.); (M.E.G.); (M.D.)
| | - Marianna Pauletto
- Department of Comparative Biomedicine and Food Science, University of Padua, Viale dell’Università 16, Legnaro, 35020 Padua, Italy; (S.I.); (M.P.); (I.B.); (F.B.); (M.E.G.); (M.D.)
| | - Irene Bassan
- Department of Comparative Biomedicine and Food Science, University of Padua, Viale dell’Università 16, Legnaro, 35020 Padua, Italy; (S.I.); (M.P.); (I.B.); (F.B.); (M.E.G.); (M.D.)
| | - Federico Bonsembiante
- Department of Comparative Biomedicine and Food Science, University of Padua, Viale dell’Università 16, Legnaro, 35020 Padua, Italy; (S.I.); (M.P.); (I.B.); (F.B.); (M.E.G.); (M.D.)
- Department of Animal Medicine, Production and Health, University of Padua, Viale dell’Università 16, Legnaro, 35020 Padua, Italy
| | - Maria Elena Gelain
- Department of Comparative Biomedicine and Food Science, University of Padua, Viale dell’Università 16, Legnaro, 35020 Padua, Italy; (S.I.); (M.P.); (I.B.); (F.B.); (M.E.G.); (M.D.)
| | - Anisa Bardhi
- Department of Veterinary Medical Sciences, Alma Mater Studiorum University of Bologna, Via Tolara di Sopra 50, Ozzano dell’Emilia, 40064 Bologna, Italy; (A.B.); (A.B.); (A.Z.)
| | - Andrea Barbarossa
- Department of Veterinary Medical Sciences, Alma Mater Studiorum University of Bologna, Via Tolara di Sopra 50, Ozzano dell’Emilia, 40064 Bologna, Italy; (A.B.); (A.B.); (A.Z.)
| | - Anna Zaghini
- Department of Veterinary Medical Sciences, Alma Mater Studiorum University of Bologna, Via Tolara di Sopra 50, Ozzano dell’Emilia, 40064 Bologna, Italy; (A.B.); (A.B.); (A.Z.)
| | - Mauro Dacasto
- Department of Comparative Biomedicine and Food Science, University of Padua, Viale dell’Università 16, Legnaro, 35020 Padua, Italy; (S.I.); (M.P.); (I.B.); (F.B.); (M.E.G.); (M.D.)
| | - Mery Giantin
- Department of Comparative Biomedicine and Food Science, University of Padua, Viale dell’Università 16, Legnaro, 35020 Padua, Italy; (S.I.); (M.P.); (I.B.); (F.B.); (M.E.G.); (M.D.)
- Correspondence: ; Tel.: +39-049-827-2946
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12
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Dutta M, Lim JJ, Cui JY. Pregnane X Receptor and the Gut-Liver Axis: A Recent Update. Drug Metab Dispos 2022; 50:478-491. [PMID: 34862253 PMCID: PMC11022899 DOI: 10.1124/dmd.121.000415] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Accepted: 12/02/2021] [Indexed: 02/04/2023] Open
Abstract
It is well-known that the pregnane X receptor (PXR)/Nr1i2 is a critical xenobiotic-sensing nuclear receptor enriched in liver and intestine and is responsible for drug-drug interactions, due to its versatile ligand binding domain (LBD) and target genes involved in xenobiotic biotransformation. PXR can be modulated by various xenobiotics including pharmaceuticals, nutraceuticals, dietary factors, and environmental chemicals. Microbial metabolites such as certain secondary bile acids (BAs) and the tryptophan metabolite indole-3-propionic acid (IPA) are endogenous PXR activators. Gut microbiome is increasingly recognized as an important regulator for host xenobiotic biotransformation and intermediary metabolism. PXR regulates and is regulated by the gut-liver axis. This review summarizes recent research advancements leveraging pharmaco- and toxico-metagenomic approaches that have redefined the previous understanding of PXR. Key topics covered in this review include: (1) genome-wide investigations on novel PXR-target genes, novel PXR-DNA interaction patterns, and novel PXR-targeted intestinal bacteria; (2) key PXR-modulating activators and suppressors of exogenous and endogenous sources; (3) novel bidirectional interactions between PXR and gut microbiome under physiologic, pathophysiological, pharmacological, and toxicological conditions; and (4) modifying factors of PXR-signaling including species and sex differences and time (age, critical windows of exposure, and circadian rhythm). The review also discusses critical knowledge gaps and important future research topics centering around PXR. SIGNIFICANCE STATEMENT: This review summarizes recent research advancements leveraging O'mics approaches that have redefined the previous understanding of the xenobiotic-sensing nuclear receptor pregnane X receptor (PXR). Key topics include: (1) genome-wide investigations on novel PXR-targeted host genes and intestinal bacteria as well as novel PXR-DNA interaction patterns; (2) key PXR modulators including microbial metabolites under physiological, pathophysiological, pharmacological, and toxicological conditions; and (3) modifying factors including species, sex, and time.
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Affiliation(s)
- Moumita Dutta
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington
| | - Joe Jongpyo Lim
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington
| | - Julia Yue Cui
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington
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13
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Cai J, Yang J, Chen X, Zhang H, Zhu Y, Liu Q, Zhang Z. Melatonin ameliorates trimethyltin chloride-induced cardiotoxicity: The role of nuclear xenobiotic metabolism and Keap1-Nrf2/ARE axis-mediated pyroptosis. Biofactors 2022; 48:481-497. [PMID: 34570919 DOI: 10.1002/biof.1787] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/15/2021] [Accepted: 09/14/2021] [Indexed: 12/19/2022]
Abstract
Trimethyltin chloride (TMT) is a stabilizer for polyvinyl chloride plastics that causes serious health hazards in nontarget organisms. Melatonin (MT) exhibits powerful protective effects in cardiac diseases. As a new environmental pollutant, TMT-induced cardiotoxicity and the protective effects of MT remain unclear. To explore this, the mice were treated with TMT (2.8 mg/kg) and/or MT (10 mg/kg) for 7 days. Firstly, the histopathological and ultrastructural evaluation showed that TMT induced cardiac damage, tumescent rupture and nuclear pyknosis. Moreover, TMT elevated the expressions of pyroptosis genes NLRP3, ASC and Cas1 and inflammation factors IL-6, IL-17 and TNFα. Secondly, TMT reduced antioxidant enzymes (GSH, CAT and T-AOC) via decreasing the expression of genes associated with the Keap1-Nrf2/ARE pathway to increase oxidative stress. Thirdly, TMT decreased the expression of genes associated with the ARE-driven drug metabolizing enzymes (DMEs), including Akr7a3, Akr1b8, and Akr1b10. Besides, TMT upregulated the mRNA expression of nuclear Xenobiotic metabolism on cytochrome P450s enzymes via increasing the expression of CAR, PXP, and AHR genes. Furthermore, MT treatment mitigated the aforementioned adverse changes induced by TMT. Overall, these results demonstrated that TMT caused pyroptosis and inflammation to aggravate cardiac damage via inducing excessive oxidative stress, imbalance of DMEs homeostasis, and nuclear Xenobiotic metabolism disorder, which could be alleviated by MT.
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Affiliation(s)
- Jingzeng Cai
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, P.R. China
| | - Jie Yang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, P.R. China
| | - Xiaoming Chen
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, P.R. China
| | - Haoran Zhang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, P.R. China
| | - Yue Zhu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, P.R. China
| | - Qi Liu
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, P.R. China
| | - Ziwei Zhang
- College of Veterinary Medicine, Northeast Agricultural University, Harbin, P.R. China
- Key Laboratory of the Provincial Education, Department of Heilongjiang for Common Animal Disease Prevention and Treatment, Harbin, P.R. China
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14
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Honkakoski P. Searching for CAR modulators. Drug Metab Dispos 2022; 50:1002-1009. [DOI: 10.1124/dmd.121.000482] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Accepted: 02/01/2022] [Indexed: 11/22/2022] Open
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15
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El-Dairi R, Rysä J, Storvik M, Pasanen M, Huuskonen P. Aflatoxin B1 targeted gene expression profiles in human placental primary trophoblast cells. Curr Res Toxicol 2022; 3:100082. [PMID: 35814288 PMCID: PMC9263407 DOI: 10.1016/j.crtox.2022.100082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2021] [Revised: 06/29/2022] [Accepted: 06/30/2022] [Indexed: 11/25/2022] Open
Abstract
Gene expression profiles were studied in human primary trophoblast cells. 170 genes were significantly dysregulated in aflatoxin B1-exposed trophoblasts. AhR-mediated estrogen receptor signalling was dysregulated in response to AFB1. Transcripts involved in endocrine signalling and energy homeostasis were disrupted. Cellular growth and development, cell cycle and DNA repair processes were affected.
Aflatoxin B1 (AFB1) is a mycotoxin produced by Aspergillus flavus and A. parasiticus. A high exposure (40 nM and 1 µM AFB1 for 72 h) was used to study mechanistic effects of AFB1 on gene expression patterns in human primary trophoblast cells, isolated from full term placentae after delivery. Gene expression profiling was conducted, and Ingenuity pathway analysis (IPA) software was used to identify AFB1-regulated gene networks and regulatory pathways. In response to 40 nM AFB1, only 7 genes were differentially expressed whereas 1 µM AFB1 significantly dysregulated 170 genes (124 down- and 46 upregulated, ±1.5-fold, p < 0.05) in AFB1-exposed trophoblasts when compared to controls. The top downregulated genes were involved in endocrine signalling and biosynthesis of hormones, and lipid and carbohydrate metabolism. The top upregulated genes were involved in protein synthesis and regulation of cell cycle. The main canonical pathways identified by IPA were associated with endocrine signalling including growth hormone signalling, and corticotropin releasing hormone signalling. Furthermore, genes involved in aryl hydrocarbon receptor (AhR)-mediated estrogen receptor signalling were dysregulated in response to AFB1. Our findings indicate that a high concentration 72 h AFB1 exposure caused relatively moderate number of changes on transcript level to human placental primary trophoblast cells. However, these preliminary results need to be confirmed with human-relevant concentrations of AFB1.
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16
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A synergism of in silico and statistical approaches to discover new potential endocrine disruptor mycotoxins. Toxicol Appl Pharmacol 2021; 435:115832. [PMID: 34933055 DOI: 10.1016/j.taap.2021.115832] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2021] [Revised: 12/14/2021] [Accepted: 12/16/2021] [Indexed: 01/14/2023]
Abstract
Mycotoxins are secondary metabolites produced by pathogenic fungi. They are found in a variety of different products, such as spices, cocoa, and cereals, and they can contaminate fields before and/or after harvest and during storage. Mycotoxins negatively impact human and animal health, causing a variety of adverse effects, ranging from acute poisoning to long-term effects. Given a large number of mycotoxins (currently more than 300 are known), it is impossible to use in vitro/in vivo methods to detect the potentially harmful effects to human health of all of these. To overcome this problem, this work aims to present a new robust computational approach, based on a combination of in silico and statistical methods, in order to screen a large number of molecules against the nuclear receptor family in a cost and time-effective manner and to discover the potential endocrine disruptor activity of mycotoxins. The results show that a high number of mycotoxins is predicted as a potential binder of nuclear receptors. In particular, ochratoxin A, zearalenone, α- and β-zearalenol, aflatoxin B1, and alternariol have been shown to be putative endocrine disruptors chemicals for nuclear receptors.
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17
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Romualdo GR, Leroy K, Costa CJS, Prata GB, Vanderborght B, da Silva TC, Barbisan LF, Andraus W, Devisscher L, Câmara NOS, Vinken M, Cogliati B. In Vivo and In Vitro Models of Hepatocellular Carcinoma: Current Strategies for Translational Modeling. Cancers (Basel) 2021; 13:5583. [PMID: 34771745 PMCID: PMC8582701 DOI: 10.3390/cancers13215583] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2021] [Revised: 11/02/2021] [Accepted: 11/04/2021] [Indexed: 12/24/2022] Open
Abstract
Hepatocellular carcinoma (HCC) is the sixth most common cancer worldwide and the third leading cause of cancer-related death globally. HCC is a complex multistep disease and usually emerges in the setting of chronic liver diseases. The molecular pathogenesis of HCC varies according to the etiology, mainly caused by chronic hepatitis B and C virus infections, chronic alcohol consumption, aflatoxin-contaminated food, and non-alcoholic fatty liver disease associated with metabolic syndrome or diabetes mellitus. The establishment of HCC models has become essential for both basic and translational research to improve our understanding of the pathophysiology and unravel new molecular drivers of this disease. The ideal model should recapitulate key events observed during hepatocarcinogenesis and HCC progression in view of establishing effective diagnostic and therapeutic strategies to be translated into clinical practice. Despite considerable efforts currently devoted to liver cancer research, only a few anti-HCC drugs are available, and patient prognosis and survival are still poor. The present paper provides a state-of-the-art overview of in vivo and in vitro models used for translational modeling of HCC with a specific focus on their key molecular hallmarks.
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Affiliation(s)
- Guilherme Ribeiro Romualdo
- Department of Pathology, School of Veterinary Medicine and Animal Science, University of São Paulo (USP), São Paulo 05508-270, Brazil; (G.R.R.); (C.J.S.C.); (T.C.d.S.)
- Department of Structural and Functional Biology, Biosciences Institute, São Paulo State University (UNESP), Botucatu 18618-689, Brazil; (G.B.P.); (L.F.B.)
- Department of Pathology, Botucatu Medical School, São Paulo State University (UNESP), Botucatu 18618-687, Brazil
| | - Kaat Leroy
- Department of Pharmaceutical and Pharmacological Sciences, Vrije Universiteit Brussel, 1090 Brussels, Belgium; (K.L.); (M.V.)
| | - Cícero Júlio Silva Costa
- Department of Pathology, School of Veterinary Medicine and Animal Science, University of São Paulo (USP), São Paulo 05508-270, Brazil; (G.R.R.); (C.J.S.C.); (T.C.d.S.)
| | - Gabriel Bacil Prata
- Department of Structural and Functional Biology, Biosciences Institute, São Paulo State University (UNESP), Botucatu 18618-689, Brazil; (G.B.P.); (L.F.B.)
- Department of Pathology, Botucatu Medical School, São Paulo State University (UNESP), Botucatu 18618-687, Brazil
| | - Bart Vanderborght
- Gut-Liver Immunopharmacology Unit, Basic and Applied Medical Sciences, Liver Research Center Ghent, Faculty of Medicine and Health Sciences, Ghent University, 9000 Ghent, Belgium;
- Hepatology Research Unit, Internal Medicine and Paediatrics, Liver Research Center Ghent, Faculty of Medicine and Health Sciences, Ghent University, 9000 Ghent, Belgium;
| | - Tereza Cristina da Silva
- Department of Pathology, School of Veterinary Medicine and Animal Science, University of São Paulo (USP), São Paulo 05508-270, Brazil; (G.R.R.); (C.J.S.C.); (T.C.d.S.)
| | - Luís Fernando Barbisan
- Department of Structural and Functional Biology, Biosciences Institute, São Paulo State University (UNESP), Botucatu 18618-689, Brazil; (G.B.P.); (L.F.B.)
| | - Wellington Andraus
- Department of Gastroenterology, Clinics Hospital, School of Medicine, University of São Paulo (HC-FMUSP), São Paulo 05403-000, Brazil;
| | - Lindsey Devisscher
- Hepatology Research Unit, Internal Medicine and Paediatrics, Liver Research Center Ghent, Faculty of Medicine and Health Sciences, Ghent University, 9000 Ghent, Belgium;
| | - Niels Olsen Saraiva Câmara
- Department of Immunology, Institute of Biomedical Sciences IV, University of São Paulo (USP), São Paulo 05508-000, Brazil;
| | - Mathieu Vinken
- Department of Pharmaceutical and Pharmacological Sciences, Vrije Universiteit Brussel, 1090 Brussels, Belgium; (K.L.); (M.V.)
| | - Bruno Cogliati
- Department of Pathology, School of Veterinary Medicine and Animal Science, University of São Paulo (USP), São Paulo 05508-270, Brazil; (G.R.R.); (C.J.S.C.); (T.C.d.S.)
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18
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Mao JX, Zhao YY, Dong JY, Liu C, Xue Q, Ding GS, Teng F, Guo WY. UBE2T And CYP3A4: hub genes regulating the transformation of cirrhosis into hepatocellular carcinoma. ALL LIFE 2021. [DOI: 10.1080/26895293.2021.1933208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Affiliation(s)
- Jia-Xi Mao
- Department of Liver Surgery and Organ Transplantation, Changzheng Hospital, Navy Medical University, Shanghai, People’s Republic of China
| | - Yuan-Yu Zhao
- Department of Liver Surgery and Organ Transplantation, Changzheng Hospital, Navy Medical University, Shanghai, People’s Republic of China
| | - Jia-Yong Dong
- Department of Liver Surgery and Organ Transplantation, Changzheng Hospital, Navy Medical University, Shanghai, People’s Republic of China
| | - Cong Liu
- Department of Liver Surgery and Organ Transplantation, Changzheng Hospital, Navy Medical University, Shanghai, People’s Republic of China
| | - Qiang Xue
- Department of Neurosurgery, Eastern Hepatobiliary Surgery Hospital, Navy Medical University, Shanghai, People’s Republic of China
| | - Guo-Shan Ding
- Department of Liver Surgery and Organ Transplantation, Changzheng Hospital, Navy Medical University, Shanghai, People’s Republic of China
| | - Fei Teng
- Department of Liver Surgery and Organ Transplantation, Changzheng Hospital, Navy Medical University, Shanghai, People’s Republic of China
| | - Wen-Yuan Guo
- Department of Liver Surgery and Organ Transplantation, Changzheng Hospital, Navy Medical University, Shanghai, People’s Republic of China
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Versicolorin A enhances the genotoxicity of aflatoxin B1 in human liver cells by inducing the transactivation of the Ah-receptor. Food Chem Toxicol 2021; 153:112258. [PMID: 33984424 DOI: 10.1016/j.fct.2021.112258] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 04/20/2021] [Accepted: 05/07/2021] [Indexed: 12/19/2022]
Abstract
Aflatoxins are a group of mycotoxins that have major adverse effects on human health. Aflatoxin B1 (AFB1) is the most important aflatoxin and a potent carcinogen once converted into a DNA-reactive form by cytochrome P450 enzymes (CYP450). AFB1 biosynthesis involves the formation of Versicolorin A (VerA) which shares structural similarities with AFB1 and can be found in contaminated commodities, often co-occurring with AFB1. This study investigated and compared the toxicity of VerA and AFB1, alone or in combination, in HepG2 human liver cells. Our results show that both toxins have similar cytotoxic effects and are genotoxic although, unlike AFB1, the main genotoxic mechanism of VerA does not involve the formation of DNA double-strand breaks. Additionally, we show that VerA activates the aryl hydrocarbon receptor (AhR) and significantly induce the expression of the CYP450-1A1 (CYP1A1) while AFB1 did not induce AhR-dependent CYP1A1 activation. Combination of VerA with AFB1 resulted in enhanced genotoxic effects, suggesting that AhR-activation by VerA influences AFB1 genotoxicity by promoting its bioactivation by CYP450s to a highly DNA-reactive metabolite. Our results emphasize the need for expanding the toxicological knowledge regarding mycotoxin biosynthetic precursors to identify those who may pose, directly or indirectly, a threat to human health.
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Navale V, Vamkudoth KR, Ajmera S, Dhuri V. Aspergillus derived mycotoxins in food and the environment: Prevalence, detection, and toxicity. Toxicol Rep 2021; 8:1008-1030. [PMID: 34408970 PMCID: PMC8363598 DOI: 10.1016/j.toxrep.2021.04.013] [Citation(s) in RCA: 55] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2020] [Revised: 04/20/2021] [Accepted: 04/27/2021] [Indexed: 12/16/2022] Open
Abstract
Aspergillus species are the paramount ubiquitous fungi that contaminate various food substrates and produce biochemicals known as mycotoxins. Aflatoxins (AFTs), ochratoxin A (OTA), patulin (PAT), citrinin (CIT), aflatrem (AT), secalonic acids (SA), cyclopiazonic acid (CPA), terrein (TR), sterigmatocystin (ST) and gliotoxin (GT), and other toxins produced by species of Aspergillus plays a major role in food and human health. Mycotoxins exhibited wide range of toxicity to the humans and animal models even at nanomolar (nM) concentration. Consumption of detrimental mycotoxins adulterated foodstuffs affects human and animal health even trace amounts. Bioaerosols consisting of spores and hyphal fragments are active elicitors of bronchial irritation and allergy, and challenging to the public health. Aspergillus is the furthermost predominant environmental contaminant unswervingly defile lives with a 40-90 % mortality risk in patients with conceded immunity. Genomics, proteomics, transcriptomics, and metabolomics approaches useful for mycotoxins' detection which are expensive. Antibody based detection of toxins chemotypes may result in cross-reactivity and uncertainty. Aptamers (APT) are single stranded DNA (ssDNA/RNA), are specifically binds to the target molecules can be generated by systematic evolution of ligands through exponential enrichment (SELEX). APT are fast, sensitive, simple, in-expensive, and field-deployable rapid point of care (POC) detection of toxins, and a better alternative to antibodies.
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Affiliation(s)
- Vishwambar Navale
- Biochemical Sciences Division, CSIR-National Chemical Laboratory, Pune, 411008, India
- Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhawan, New Delhi, India
| | - Koteswara Rao Vamkudoth
- Biochemical Sciences Division, CSIR-National Chemical Laboratory, Pune, 411008, India
- Academy of Scientific and Innovative Research (AcSIR), Anusandhan Bhawan, New Delhi, India
| | | | - Vaibhavi Dhuri
- Biochemical Sciences Division, CSIR-National Chemical Laboratory, Pune, 411008, India
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21
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Li D, Gong B, Xu J, Ning B, Tong W. Impact of Sequencing Depth and Library Preparation on Toxicological Interpretation of RNA-Seq Data in a "Three-Sample" Scenario. Chem Res Toxicol 2021; 34:529-540. [PMID: 33354967 PMCID: PMC7887111 DOI: 10.1021/acs.chemrestox.0c00368] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
While RNA-sequencing (RNA-seq) has emerged as a standard approach in toxicogenomics, its full potential in gaining underlying toxicological mechanisms is still not clear when only three biological replicates are used. This "three-sample" study design is common in toxicological research, particularly in animal studies during preclinical drug development. Sequencing depth (the total number of reads in an experiment) and library preparation are critical to the resolution and integrity of RNA-seq data and biological interpretation. We used aflatoxin b1 (AFB1), a model toxicant, to investigate the effect of sequencing depth and library preparation in RNA-seq on toxicological interpretation in the "three-sample" scenario. We also compared different gene profiling platforms (RNA-seq, TempO-seq, microarray, and qPCR) using identical liver samples. Well-established mechanisms of AFB1 toxicity served as ground truth for our comparative analyses. We found that a minimum of 20 million reads was sufficient to elicit key toxicity functions and pathways underlying AFB1-induced liver toxicity using three replicates and that identification of differentially expressed genes was positively associated with sequencing depth to a certain extent. Further, our results showed that RNA-seq revealed toxicological insights from pathway enrichment with overall higher statistical power and overlap ratio, compared with TempO-seq and microarray. Moreover, library preparation using the same methods was important to reproducing the toxicological interpretation.
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Affiliation(s)
- Dongying Li
- Division of Bioinformatics and Biostatistics, National Center for Toxicological Research, United States Food and Drug Administration, Jefferson, Arkansas 72079, United States
| | - Binsheng Gong
- Division of Bioinformatics and Biostatistics, National Center for Toxicological Research, United States Food and Drug Administration, Jefferson, Arkansas 72079, United States
| | - Joshua Xu
- Division of Bioinformatics and Biostatistics, National Center for Toxicological Research, United States Food and Drug Administration, Jefferson, Arkansas 72079, United States
| | - Baitang Ning
- Division of Bioinformatics and Biostatistics, National Center for Toxicological Research, United States Food and Drug Administration, Jefferson, Arkansas 72079, United States
| | - Weida Tong
- Division of Bioinformatics and Biostatistics, National Center for Toxicological Research, United States Food and Drug Administration, Jefferson, Arkansas 72079, United States
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22
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Ates MB, Ortatatli M. Phase-1 bioactivation mechanisms of aflatoxin through AhR, CAR and PXR nuclear receptors and the interactions with Nigella sativa seeds and thymoquinone in broilers. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2021; 208:111774. [PMID: 33396089 DOI: 10.1016/j.ecoenv.2020.111774] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2020] [Revised: 12/04/2020] [Accepted: 12/05/2020] [Indexed: 06/12/2023]
Abstract
Aflatoxins (AFs) are metabolised in two main phases in the liver. Cytochrome p450 enzyme (CYP) 1A1 and CYP2A6 are expressed through AhR, CAR and PXR nuclear receptors in phase-1 biotransformation of AFs. This study is the first to examine phase-1 biotransformation mechanisms of AF and the activity of Nigella sativa seed (NS) and its active ingredient thymoquinone (TQ) on these enzymes and receptors at the molecular level in broilers. Six groups of one day old broiler chicken (20 animals per group) were fed either control feed or a diet containing Aspergillus parasiticus NRRL 2999 culture material (total AFs 2 mg/kg), TQ (300 mg/kg), and NS (5%), either alone or as AF + TQ and AF + NS. Randomly selected from each group, 10 chicks were necropsied, and the livers were removed. Histopathological examination and serum biochemistry results revealed that AF caused hydropic and fatty degenerations, periportal inflammatory infiltrations, acinar arrangement, and biliary duct proliferation in livers and a significant increase at AST, ALT, ALP and GGT levels while significant decreases at serum cholesterol and total protein levels. These aflatoxicosis lesions and deteriorations in biochemistry levels were significantly ameliorated by NS or TQ (p < 0.05). AF was immunohistochemically found to increase strongly the nuclear receptors of AhR, PXR, CAR, and the enzyme activity of CYP1A1 and CYP2A6 responsible for its metabolism, leading to the emergence of toxic effects. Addition of TQ or NS to AF-containing diets improved the negative effects of AF on these receptors and enzymes significantly (p < 0.05). It was concluded that TQ and NS successfully alleviated liver injury by inhibiting or reducing the bioactivation of AF through phase-1 nuclear receptors and CYP-450 enzymes modulation.
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Affiliation(s)
- Mehmet Burak Ates
- Selcuk University, Faculty of Veterinary Medicine, Department of Pathology, 42130 Konya, Turkey.
| | - Mustafa Ortatatli
- Selcuk University, Faculty of Veterinary Medicine, Department of Pathology, 42130 Konya, Turkey
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23
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Hua Z, Liu R, Chen Y, Liu G, Li C, Song Y, Cao Z, Li W, Li W, Lu C, Liu Y. Contamination of Aflatoxins Induces Severe Hepatotoxicity Through Multiple Mechanisms. Front Pharmacol 2021; 11:605823. [PMID: 33505311 PMCID: PMC7830880 DOI: 10.3389/fphar.2020.605823] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2020] [Accepted: 11/20/2020] [Indexed: 12/15/2022] Open
Abstract
Aflatoxins (AFs) are commonly contaminating mycotoxins in foods and medicinal materials. Since they were first discovered to cause “turkey X” disease in the United Kingdom in the early 1960s, the extreme toxicity of AFs in the human liver received serious attention. The liver is the major target organ where AFs are metabolized and converted into extremely toxic forms to engender hepatotoxicity. AFs influence mitochondrial respiratory function and destroy normal mitochondrial structure. AFs initiate damage to mitochondria and subsequent oxidative stress. AFs block cellular survival pathways, such as autophagy that eliminates impaired cellular structures and the antioxidant system that copes with oxidative stress, which may underlie their high toxicities. AFs induce cell death via intrinsic and extrinsic apoptosis pathways and influence the cell cycle and growth via microribonucleic acids (miRNAs). Furthermore, AFs induce the hepatic local inflammatory microenvironment to exacerbate hepatotoxicity via upregulation of NF-κB signaling pathway and inflammasome assembly in the presence of Kupffer cells (liver innate immunocytes). This review addresses the mechanisms of AFs-induced hepatotoxicity from various aspects and provides background knowledge to better understand AFs-related hepatoxic diseases.
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Affiliation(s)
- Zhenglai Hua
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Rui Liu
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Youwen Chen
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Guangzhi Liu
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Chenxi Li
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Yurong Song
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Zhiwen Cao
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Wen Li
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Weifeng Li
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
| | - Cheng Lu
- Institute of Basic Research in Clinical Medicine, China Academy of Chinese Medical Sciences, Beijing, China
| | - Yuanyan Liu
- School of Chinese Materia Medica, Beijing University of Chinese Medicine, Beijing, China
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24
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Mehrzad J. Environmentally relevant level of aflatoxin B1 and the role of (non)oxidative immuno-/neurodysregulation and toxicity. Toxicology 2021. [DOI: 10.1016/b978-0-12-819092-0.00018-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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25
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Li X, Cao C, Zhu X, Li X, Wang K. Fumonisins B1 exposure triggers intestinal tract injury via activating nuclear xenobiotic receptors and attracting inflammation response. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2020; 267:115461. [PMID: 33254674 DOI: 10.1016/j.envpol.2020.115461] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 08/14/2020] [Accepted: 08/18/2020] [Indexed: 06/12/2023]
Abstract
Fumonisins (FBs) are mycotoxins that are widely distributed in crops and feed, and ingestion of FBs -contaminated crops is harmful to animal health. Furthermore, it is unknown if Fumonisins B1 (FB1) can cause intestinal toxicity. To investigate FB1-induced intestinal toxicity, mice were treated with 0 or 5 mg/kg FB1 by gavage administration for 42 days. Histopathology indicated that FB1 exposure caused proliferation of intestinal epithelial cells, intestinal villi and epithelial layer shedding, intestinal gland atrophy, and necrosis. Notably, FB1 interfered with nuclear xenobiotic receptors (NXR) homeostasis by regulating the level of aryl hydrocarbon receptor (AHR), constitutive androstane receptor (CAR), pregnane X receptor (PXR) and downstream target genes (CYP450s). Moreover, abnormal expression of inflammatory cytokines (IL-1β, IL-2, IL-4, IL-10, and TNF-α) indicated the occurrence of inflammation. The present study provides new insights regarding the mechanism of FB1-induced intestinal toxicity through activating the NXR system and by triggering inflammatory responses in the intestinal tract in mice.
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Affiliation(s)
- Xinran Li
- College of Life Science and Engineering, Foshan University, Foshan, Guangdong, 528231, PR China.
| | - Changyu Cao
- College of Life Science and Engineering, Foshan University, Foshan, Guangdong, 528231, PR China.
| | - Xingyi Zhu
- College of Life Science and Engineering, Foshan University, Foshan, Guangdong, 528231, PR China
| | - Xiaowen Li
- College of Life Science and Engineering, Foshan University, Foshan, Guangdong, 528231, PR China
| | - Kai Wang
- College of Life Science and Engineering, Foshan University, Foshan, Guangdong, 528231, PR China.
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26
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Regulation of CAR and PXR Expression in Health and Disease. Cells 2020; 9:cells9112395. [PMID: 33142929 PMCID: PMC7692647 DOI: 10.3390/cells9112395] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/28/2020] [Revised: 10/22/2020] [Accepted: 10/28/2020] [Indexed: 12/12/2022] Open
Abstract
Pregnane X receptor (PXR, NR1I2) and constitutive androstane receptor (CAR, NR1I3) are members of the nuclear receptor superfamily that mainly act as ligand-activated transcription factors. Their functions have long been associated with the regulation of drug metabolism and disposition, and it is now well established that they are implicated in physiological and pathological conditions. Considerable efforts have been made to understand the regulation of their activity by their cognate ligand; however, additional regulatory mechanisms, among which the regulation of their expression, modulate their pleiotropic effects. This review summarizes the current knowledge on CAR and PXR expression during development and adult life; tissue distribution; spatial, temporal, and metabolic regulations; as well as in pathological situations, including chronic diseases and cancers. The expression of CAR and PXR is modulated by complex regulatory mechanisms that involve the interplay of transcription factors and also post-transcriptional and epigenetic modifications. Moreover, many environmental stimuli affect CAR and PXR expression through mechanisms that have not been elucidated.
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27
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Insights into Aflatoxin B1 Toxicity in Cattle: An In Vitro Whole-Transcriptomic Approach. Toxins (Basel) 2020; 12:toxins12070429. [PMID: 32610656 PMCID: PMC7404968 DOI: 10.3390/toxins12070429] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 06/24/2020] [Accepted: 06/26/2020] [Indexed: 02/07/2023] Open
Abstract
Aflatoxins, and particularly aflatoxin B1 (AFB1), are toxic mycotoxins to humans and farm animal species, resulting in acute and chronic toxicities. At present, AFB1 is still considered a global concern with negative impacts on health, the economy, and social life. In farm animals, exposure to AFB1-contaminated feed may cause several untoward effects, liver damage being one of the most devastating ones. In the present study, we assessed in vitro the transcriptional changes caused by AFB1 in a bovine fetal hepatocyte-derived cell line (BFH12). To boost the cellular response to AFB1, cells were pre-treated with the co-planar PCB 3,3′,4,4′,5-pentachlorobiphenyl (PCB126), a known aryl hydrocarbon receptor agonist. Three experimental groups were considered: cells exposed to the vehicle only, to PCB126, and to PCB126 and AFB1. A total of nine RNA-seq libraries (three replicates/group) were constructed and sequenced. The differential expression analysis showed that PCB126 induced only small transcriptional changes. On the contrary, AFB1 deeply affected the cell transcriptome, the majority of significant genes being associated with cancer, cellular damage and apoptosis, inflammation, bioactivation, and detoxification pathways. Investigating mRNA perturbations induced by AFB1 in cattle BFH12 cells will help us to better understand AFB1 toxicodynamics in this susceptible and economically important food-producing species.
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28
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Schrenk D, Bignami M, Bodin L, Chipman JK, del Mazo J, Grasl‐Kraupp B, Hogstrand C, Hoogenboom L(R, Leblanc J, Nebbia CS, Nielsen E, Ntzani E, Petersen A, Sand S, Schwerdtle T, Vleminckx C, Marko D, Oswald IP, Piersma A, Routledge M, Schlatter J, Baert K, Gergelova P, Wallace H. Risk assessment of aflatoxins in food. EFSA J 2020; 18:e06040. [PMID: 32874256 PMCID: PMC7447885 DOI: 10.2903/j.efsa.2020.6040] [Citation(s) in RCA: 112] [Impact Index Per Article: 28.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
EFSA was asked to deliver a scientific opinion on the risks to public health related to the presence of aflatoxins in food. The risk assessment was confined to aflatoxin B1 (AFB1), AFB2, AFG1, AFG2 and AFM1. More than 200,000 analytical results on the occurrence of aflatoxins were used in the evaluation. Grains and grain-based products made the largest contribution to the mean chronic dietary exposure to AFB1 in all age classes, while 'liquid milk' and 'fermented milk products' were the main contributors to the AFM1 mean exposure. Aflatoxins are genotoxic and AFB1 can cause hepatocellular carcinomas (HCCs) in humans. The CONTAM Panel selected a benchmark dose lower confidence limit (BMDL) for a benchmark response of 10% of 0.4 μg/kg body weight (bw) per day for the incidence of HCC in male rats following AFB1 exposure to be used in a margin of exposure (MOE) approach. The calculation of a BMDL from the human data was not appropriate; instead, the cancer potencies estimated by the Joint FAO/WHO Expert Committee on Food Additives in 2016 were used. For AFM1, a potency factor of 0.1 relative to AFB1 was used. For AFG1, AFB2 and AFG2, the in vivo data are not sufficient to derive potency factors and equal potency to AFB1 was assumed as in previous assessments. MOE values for AFB1 exposure ranged from 5,000 to 29 and for AFM1 from 100,000 to 508. The calculated MOEs are below 10,000 for AFB1 and also for AFM1 where some surveys, particularly for the younger age groups, have an MOE below 10,000. This raises a health concern. The estimated cancer risks in humans following exposure to AFB1 and AFM1 are in-line with the conclusion drawn from the MOEs. The conclusions also apply to the combined exposure to all five aflatoxins.
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29
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Kreuzer K, Frenzel F, Lampen A, Braeuning A, Böhmert L. Transcriptomic effect marker patterns of genotoxins - a comparative study with literature data. J Appl Toxicol 2019; 40:448-457. [PMID: 31845381 DOI: 10.1002/jat.3928] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2019] [Revised: 10/29/2019] [Accepted: 11/03/2019] [Indexed: 01/19/2023]
Abstract
Microarray approaches are frequently used experimental tools which have proven their value for example in the characterization of the molecular mode of action of toxicologically relevant compounds. In a regulatory context, omics techniques are still not routinely used, amongst others due to lacking standardization in experimental setup and data processing, and also due to issues with the definition of adversity. In order to exemplarily determine whether consensus transcript biomarker signatures for a certain toxicological endpoint can be derived from published microarray datasets, we here compared transcriptome data from human HepaRG hepatocarcinoma cells treated with different genotoxins, based on re-analyzed datasets extracted from the literature. Comparison of the resulting data show that even with similarly-acting compounds in the same cell line, considerable variation was observed with respect to the numbers and identities of differentially expressed genes. Greater concordance was observed when considering the whole data sets and biological functions associated with the genes affected. The present results highlight difficulties and possibilities in inter-experiment comparisons of omics data and underpin the need for future efforts towards improved standardization to facilitate the use of omics data in risk assessment. Existing omics datasets may nonetheless prove valuable in establishing biological context information essential for the development of adverse outcome pathways.
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Affiliation(s)
- Katrin Kreuzer
- Dept. Food Safety, German Federal Institute for Risk Assessment, Berlin, Germany
| | - Falko Frenzel
- Dept. Food Safety, German Federal Institute for Risk Assessment, Berlin, Germany
| | - Alfonso Lampen
- Dept. Food Safety, German Federal Institute for Risk Assessment, Berlin, Germany
| | - Albert Braeuning
- Dept. Food Safety, German Federal Institute for Risk Assessment, Berlin, Germany
| | - Linda Böhmert
- Dept. Food Safety, German Federal Institute for Risk Assessment, Berlin, Germany
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30
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Ghadiri S, Spalenza V, Dellafiora L, Badino P, Barbarossa A, Dall'Asta C, Nebbia C, Girolami F. Modulation of aflatoxin B1 cytotoxicity and aflatoxin M1 synthesis by natural antioxidants in a bovine mammary epithelial cell line. Toxicol In Vitro 2019; 57:174-183. [PMID: 30849473 DOI: 10.1016/j.tiv.2019.03.002] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2018] [Revised: 02/14/2019] [Accepted: 03/04/2019] [Indexed: 02/07/2023]
Abstract
Aflatoxin (AF) B1, a widespread food and feed contaminant, is bioactivated by drug metabolizing enzymes (DME) to cytotoxic and carcinogenic metabolites like AFB1-epoxide and AFM1, a dairy milk contaminant. A number of natural antioxidants have been reported to afford a certain degree of protection against AFB1 (cyto)toxicity. As the mammary gland potentially participates in the generation of AFB1 metabolites, we evaluated the role of selected natural antioxidants (i.e. curcumin, quercetin and resveratrol) in the modulation of AFB1 toxicity and metabolism using a bovine mammary epithelial cell line (BME-UV1). Quercetin and, to a lesser extent, resveratrol and curcumin from Curcuma longa (all at 5 μM) significantly counteracted the AFB1-mediated impairment of cell viability (concentration range: 96-750 nM). Moreover, quercetin was able to significantly reduce the synthesis of AFM1. The quantitative PCR analysis on genes encoding for DME (phase I and II) and antioxidant enzymes showed that AFB1 caused an overall downregulation of the detoxifying systems, and mainly of GSTA1, which mediates the GSH conjugation of the AFB1-epoxide. The negative modulation of GSTA1 was efficiently reversed in the presence of quercetin, which significantly increased GSH levels as well. It is suggested that quercetin exerts its beneficial effects by depressing the bio-transformation of AFB1 and counterbalancing its pro-oxidant effects.
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Affiliation(s)
- Shiva Ghadiri
- Department of Veterinary Sciences, University of Torino, Largo Braccini 2, Grugliasco, Italy
| | - Veronica Spalenza
- Department of Veterinary Sciences, University of Torino, Largo Braccini 2, Grugliasco, Italy
| | - Luca Dellafiora
- Department of Food and Drug, University of Parma, Via G.P. Usberti 27/A, 43124 Parma, Italy
| | - Paola Badino
- Department of Veterinary Sciences, University of Torino, Largo Braccini 2, Grugliasco, Italy
| | - Andrea Barbarossa
- Department of Veterinary Medical Sciences, University of Bologna, Via Tolara di Sopra 50, Ozzano dell'Emilia, Italy
| | - Chiara Dall'Asta
- Department of Food and Drug, University of Parma, Via G.P. Usberti 27/A, 43124 Parma, Italy
| | - Carlo Nebbia
- Department of Veterinary Sciences, University of Torino, Largo Braccini 2, Grugliasco, Italy
| | - Flavia Girolami
- Department of Veterinary Sciences, University of Torino, Largo Braccini 2, Grugliasco, Italy.
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31
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Chen Y, Liu Y. Non-coplanar and coplanar polychlorinated biphenyls potentiate genotoxicity of aflatoxin B1 in a human hepatocyte line by enhancing CYP1A2 and CYP3A4 expression. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2019; 246:945-954. [PMID: 31159144 DOI: 10.1016/j.envpol.2018.12.041] [Citation(s) in RCA: 34] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2018] [Revised: 12/14/2018] [Accepted: 12/14/2018] [Indexed: 06/09/2023]
Abstract
Polychlorinated biphenyls (PCBs) are persistent organic pollutants and hazardous to human health. Aflatoxin B1 (AFB1) is a strong carcinogen dependent on activation by cytochrome P450 (CYP) 1A2 and 3A4. Humans in some regions may be exposed to both PCBs and AFB1. Since PCBs are CYP inducers, we were interested in their combined genotoxicity. In this study, the effects of non-coplanar 2,3,3'-tri- (PCB 20), 2,2'5,5'-tetra- (PCB 52), 2,3,3',4'-tetrachlorobiphenyl (PCB 56), and coplanar 3,3',4,4',5-pentachlorobiphenyl (PCB 126) on protein levels of CYP1A1, 1A2, and 3A4, and nuclear receptors AhR, CAR and PXR in a human hepatocyte (L-02) line were investigated. Moreover, the combined effects of each PCB and AFB1 for induction of micronuclei and double-strand DNA breaks (indicated by an elevation of γ-H2AX) were analyzed. The results indicated that PCBs 20, 52 and 56 reduced the expression of AhR, while elevated that of CAR and PXR, with thresholds at low micromolar concentrations. However, they were less potent than PCB 126, which was active at sub-nanomolar levels. Overexpression of human splice variant CAR 3 in the cells increased CYP1A2 and 3A4 levels, which were further enhanced by each non-coplanar PCB, suggesting a role of CAR in modulating CYPs. Pretreatment of cells with each test PCB potentiated both micronuclei formation and DNA damage induced by AFB1. This study suggests that both non-coplanar and coplanar PCBs may enhance the genotoxicity of AFB1, through acting on various nuclear receptors; the potentiation of AFB1 genotoxicity by PCBs and the potential health implications may deserve concerns and further investigation.
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Affiliation(s)
- Yuting Chen
- Department of Toxicology, School of Public Health, Southern Medical University (Guangdong Provincial Key Laboratory of Tropical Disease Research), 1023 S. Shatai Road, Guangzhou, 510515, China
| | - Yungang Liu
- Department of Toxicology, School of Public Health, Southern Medical University (Guangdong Provincial Key Laboratory of Tropical Disease Research), 1023 S. Shatai Road, Guangzhou, 510515, China.
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32
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Meneely JP, Hajšlová J, Krska R, Elliott CT. Assessing the combined toxicity of the natural toxins, aflatoxin B 1, fumonisin B 1 and microcystin-LR by high content analysis. Food Chem Toxicol 2018; 121:527-540. [PMID: 30253246 DOI: 10.1016/j.fct.2018.09.052] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Revised: 09/20/2018] [Accepted: 09/22/2018] [Indexed: 12/19/2022]
Abstract
As human co-exposure to natural toxins through food and water is inevitable, risk assessments to safeguard health are necessary. Aflatoxin B1 and fumonisin B1, frequent co-contaminants of maize and microcystin-LR, produced in freshwater by cyanobacteria are all naturally occurring potent toxins that threaten human health. Populations in the poorest regions of the world may suffer repeated simultaneous exposure to these contaminants. Using High Content Analysis, multiple cytotoxicity endpoints were measured for the individual toxins and mixtures in various cell lines. Results highlighted that significant cytotoxic effects were observed for aflatoxin B1 in all cell lines while no cytotoxic effects were observed for fumonisin B1 or microcystin-LR. Aflatoxin B1/microcystin-LR was cytotoxic in the order HepG2 > Caco-2 > MDBK. Fumonisin B1/microcystin-LR affected MDBK cells. The ternary mixture was cytotoxic to all cell lines. Most combinations were additive, however antagonism was observed for binary and ternary mixtures in HepG2 and MDBK cell lines at low and high concentrations. Synergy was observed in all cell lines, including at low concentrations. The combination of these natural toxins may pose a significant risk to populations in less developed countries. Furthermore, the study highlights the complexity around trying to regulate for human exposure to multiple contaminants.
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Affiliation(s)
- Julie P Meneely
- Institute for Global Food Security, School of Biological Sciences, Queen's University, Belfast, BT7 1NN, United Kingdom.
| | - Jana Hajšlová
- Faculty of Food & Biochemical Technology, Department of Food Analysis & Nutrition, University of Chemistry & Technology, Technická 3, 166 28, Prague 6, Czech Republic
| | - Rudolf Krska
- Center for Analytical Chemistry, Department of Agrobiotechnology (IFA-Tulln), University of Natural Resources and Life Sciences, Vienna (BOKU), Konrad Lorenz Str. 20, 3430, Tulln, Austria
| | - Christopher T Elliott
- Institute for Global Food Security, School of Biological Sciences, Queen's University, Belfast, BT7 1NN, United Kingdom
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33
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Mehrzad J, Bahari A, Bassami MR, Mahmoudi M, Dehghani H. Immunobiologically relevant level of aflatoxin B1 alters transcription of key functional immune genes, phagocytosis and survival of human dendritic cells. Immunol Lett 2018; 197:44-52. [DOI: 10.1016/j.imlet.2018.03.008] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2017] [Revised: 03/17/2018] [Accepted: 03/18/2018] [Indexed: 01/18/2023]
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34
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Mary VS, Arias SL, Otaiza SN, Velez PA, Rubinstein HR, Theumer MG. The aflatoxin B 1 -fumonisin B 1 toxicity in BRL-3A hepatocytes is associated to induction of cytochrome P450 activity and arachidonic acid metabolism. ENVIRONMENTAL TOXICOLOGY 2017; 32:1711-1724. [PMID: 28181396 DOI: 10.1002/tox.22395] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Revised: 01/12/2017] [Accepted: 01/15/2017] [Indexed: 06/06/2023]
Abstract
Human oral exposure to aflatoxin B1 (AFB1 ) and fumonisin B1 (FB1 ) is associated with increased hepatocellular carcinoma. Although evidence suggested interactive AFB1 -FB1 hepatotoxicity, the underlying mechanisms remain mostly unidentified. This work was aimed at evaluating the possible AFB1 -FB1 interplay to induce genetic and cell cycle toxicities in BRL-3A rat hepatocytes, reactive oxygen species (ROS) involvement, and the AFB1 metabolizing pathways cytochrome P450 (CYP) and arachidonic acid (ArAc) metabolism as ROS contributors. Flow cytometry of stained BRL-3A hepatocytes was used to study the cell cycle (propidium iodide), ROS intracellular production (DCFH-DA, HE, DAF-2 DA), and phospholipase A activity (staining with bis-BODIPY FL C11-PC). The CYP1A activity was assessed by the 7-ethoxyresorufin-O-deethylase (EROD) assay. Despite a 48-h exposure to FB1 (30 μM) not being genotoxic, the AFB1 (20 μM)-induced micronucleus frequency was overcome by the AFB1 -FB1 mixture (MIX), presumably showing toxin interaction. The mycotoxins blocked G1/S-phase, but only MIX caused cell death. Overall, the oxidative stress led these alterations as the pretreatment with N-acetyl-l-cysteine reduced such toxic effects. While AFB1 had a major input to the MIX pro-oxidant activity, with CYP and ArAc metabolism being ROS contributors, these pathways were not involved in the FB1 -elicited weak oxidative stress. The MIX-induced micronucleus frequency in N-acetyl-l-cysteine pretreated cells was greater than that caused by AFB1 without antioxidants, suggesting enhanced AFB1 direct genotoxicity probably owing to the higher CYP activity and ArAc metabolism found in MIX. The metabolic pathways modulation by AFB1 -FB1 mixtures could raise its hepatocarcinogenic properties.
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Affiliation(s)
- Verónica S Mary
- Departamento de Bioquímica Clínica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Centro de Investigaciones en Bioquímica Clínica e Inmunología (CIBICI), UNC, CONICET, Córdoba, X5000HUA, Argentina
| | - Silvina L Arias
- Departamento de Bioquímica Clínica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Centro de Investigaciones en Bioquímica Clínica e Inmunología (CIBICI), UNC, CONICET, Córdoba, X5000HUA, Argentina
| | - Santiago N Otaiza
- Departamento de Bioquímica Clínica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Centro de Investigaciones en Bioquímica Clínica e Inmunología (CIBICI), UNC, CONICET, Córdoba, X5000HUA, Argentina
| | - Pilar A Velez
- Departamento de Bioquímica Clínica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Centro de Investigaciones en Bioquímica Clínica e Inmunología (CIBICI), UNC, CONICET, Córdoba, X5000HUA, Argentina
| | - Héctor R Rubinstein
- Departamento de Bioquímica Clínica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Centro de Investigaciones en Bioquímica Clínica e Inmunología (CIBICI), UNC, CONICET, Córdoba, X5000HUA, Argentina
| | - Martín G Theumer
- Departamento de Bioquímica Clínica, Facultad de Ciencias Químicas, Universidad Nacional de Córdoba, Centro de Investigaciones en Bioquímica Clínica e Inmunología (CIBICI), UNC, CONICET, Córdoba, X5000HUA, Argentina
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Shi B, Su Y, Chang S, Sun Y, Meng X, Shan A. Vitamin C protects piglet liver against zearalenone-induced oxidative stress by modulating expression of nuclear receptors PXR and CAR and their target genes. Food Funct 2017; 8:3675-3687. [DOI: 10.1039/c7fo01301a] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Zearalenone (ZEN), a common mycotoxin found in human food and animal feed, is effectively detoxified by vitamin C by modulation of the nuclear receptor signaling pathway.
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Affiliation(s)
- Baoming Shi
- Institute of Animal Nutrition
- Northeast Agricultural University
- Harbin
- P. R. China
| | - Yang Su
- Institute of Animal Nutrition
- Northeast Agricultural University
- Harbin
- P. R. China
| | - Siying Chang
- Institute of Animal Nutrition
- Northeast Agricultural University
- Harbin
- P. R. China
| | - Yuchen Sun
- Institute of Animal Nutrition
- Northeast Agricultural University
- Harbin
- P. R. China
| | - Xiangyu Meng
- Institute of Animal Nutrition
- Northeast Agricultural University
- Harbin
- P. R. China
| | - Anshan Shan
- Institute of Animal Nutrition
- Northeast Agricultural University
- Harbin
- P. R. China
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Dall'Asta C. Mycotoxins and Nuclear Receptors: A Still Underexplored Issue. NUCLEAR RECEPTOR RESEARCH 2016. [DOI: 10.11131/2016/101204] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022] Open
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Ghufran MS, Ghosh K, Kanade SR. Aflatoxin B1 induced upregulation of protein arginine methyltransferase 5 in human cell lines. Toxicon 2016; 119:117-21. [PMID: 27242039 DOI: 10.1016/j.toxicon.2016.05.015] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2016] [Revised: 05/17/2016] [Accepted: 05/26/2016] [Indexed: 11/29/2022]
Abstract
The exposure of naturally occurring mycotoxins affects human health and play a vital role in cancer initiation and progression. Aflatoxin B1 is a difuranocoumarin mycotoxin, classified as a group I carcinogen. The present study was conducted to assess the effect of aflatoxin B1 on epigenetic regulatory proteins. The protein arginine methyltransferase 5 expression was induced upon aflatoxin B1 treatment in a dose and time dependent manner. Further global arginine methylation was also increased in the same manner. This is the first report showing the induction of epigenetic regulatory protein, protein arginine methyltransferase 5 upon aflatoxin B1 treatment. Further study is required to establish the detailed pathway of PRMT5 induction.
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Affiliation(s)
- Md Sajid Ghufran
- Department of Biochemistry and Molecular Biology, Central University of Kerala, Kasargod, Kerala, 671314, India
| | - Krishna Ghosh
- Department of Biochemistry and Molecular Biology, Central University of Kerala, Kasargod, Kerala, 671314, India
| | - Santosh R Kanade
- Department of Biochemistry and Molecular Biology, Central University of Kerala, Kasargod, Kerala, 671314, India.
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Wen J, Mu P, Deng Y. Mycotoxins: cytotoxicity and biotransformation in animal cells. Toxicol Res (Camb) 2016; 5:377-387. [PMID: 30090353 PMCID: PMC6062401 DOI: 10.1039/c5tx00293a] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/19/2015] [Accepted: 01/06/2016] [Indexed: 12/12/2022] Open
Abstract
Mycotoxins are secondary metabolites produced by many microfungi. Hitherto, over 300 mycotoxins with diverse structures have been identified. They contaminate most cereals and feedstuffs, which threaten human and animal health by exerting acute, sub-acute and chronic toxicological effects, with some considered as carcinogens. Many mycotoxins at low concentrations are able to induce the expression of cytochrome P450 and other enzymes implicated in the biotransformation and metabolization of mycotoxins in vivo and in vitro. Mycotoxins and their metabolites elicit different cellular disorders and adverse effects such as oxidative stress, inhibition of translation, DNA damage and apoptosis in host cells, thus causing various kinds of cytotoxicities. In this review, we summarize the biotransformation of mycotoxins in animal cells by CYP450 isoforms and other enzymes, their altered expression under mycotoxin exposure, and recent progress in mycotoxin cytotoxicity in different cell lines. Furthermore, we try to generalize the molecular mechanisms of mycotoxin effects in human and animal cells.
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Affiliation(s)
- Jikai Wen
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms , College of Life Sciences , South China Agricultural University , Tianhe District , Guangzhou , Guangdong 510642 , P. R. China . ; ; Tel: +86 20 38604967
| | - Peiqiang Mu
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms , College of Life Sciences , South China Agricultural University , Tianhe District , Guangzhou , Guangdong 510642 , P. R. China . ; ; Tel: +86 20 38604967
| | - Yiqun Deng
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms , College of Life Sciences , South China Agricultural University , Tianhe District , Guangzhou , Guangdong 510642 , P. R. China . ; ; Tel: +86 20 38604967
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Doricakova A, Vrzal R. A food contaminant ochratoxin A suppresses pregnane X receptor (PXR)-mediated CYP3A4 induction in primary cultures of human hepatocytes. Toxicology 2015; 337:72-8. [PMID: 26341324 DOI: 10.1016/j.tox.2015.08.012] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2015] [Revised: 08/25/2015] [Accepted: 08/30/2015] [Indexed: 01/11/2023]
Abstract
Ochratoxin A (OCHA) is a mycotoxin, which can be found in food such as coffee, wine, cereals, meat, nuts. Since it is absorbed via gastrointestinal tract, it is reasonable to anticipate that the liver will be the first organ to which OCHA comes into the contact before systemic circulation. Many xenobiotics are metabolically modified after the passage of the liver to biologically more active substances, sometimes with more harmful activity. Promoting own metabolism is often achieved via transcriptional regulation of biotransformation enzymes through ligand-activated transcription factors. Pregnane X receptor (PXR) belongs to such a group of regulators and it was demonstrated to be activated by many compounds of synthetic as well as natural origin. Our intention was to investigate if OCHA is capable of activating the PXR with consequent induction of PXR-regulated CYP3A4 gene. We found that OCHA does not activate PXR but displays antagonist-like behavior when combined with rifampicin (RIF) in gene reporter assay in human embryonal kidney cells (Hek293T). It was very weak inducer of CYP3A4 mRNA in primary cultures of human hepatocytes and it antagonized RIF-mediated CYP3A4 induction of mRNA as well as protein. In addition, it caused the decline of PXR protein as well as mRNA which was faster than that with actinomycin D, a transcription inhibitor. Since we found that OCHA induced the expression of miR-148a, which was described to regulate PXR expression, we conclude that antagonist-like behavior of OCHA is not due to the antagonism itself but due to the downregulation of PXR gene expression. Herein we provide important findings which bring a piece of puzzle into the understanding of mechanism of toxic action of ochratoxin A.
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Affiliation(s)
- Aneta Doricakova
- Department of Cell Biology and Genetics, Faculty of Science, Palacky University, Olomouc, Czech Republic
| | - Radim Vrzal
- Department of Cell Biology and Genetics, Faculty of Science, Palacky University, Olomouc, Czech Republic.
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Lv J, Yu YQ, Li SQ, Luo L, Wang Q. Aflatoxin B1 promotes cell growth and invasion in hepatocellular carcinoma HepG2 cells through H19 and E2F1. Asian Pac J Cancer Prev 2015; 15:2565-70. [PMID: 24761865 DOI: 10.7314/apjcp.2014.15.6.2565] [Citation(s) in RCA: 43] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
Abstract
H19 is an imprinted oncofetal gene, and loss of imprinting at the H19 locus results in over-expression of H19 in cancers. Aflatoxin B1(AFB1) is regarded as one of the most dangerous carcinogens. Exposure to AFB1 would most easily increase susceptibility to diseases such as hepatocellular carcinoma(HCC) but any possible relationship between AFB1 and H19 is not clear. In present study, we found that AFB1 could up-regulate the expression of H19 and promote cell growth and invasion by hepatocellular carcinoma HepG2 cells. Knocking down H19 RNA co ld reverse the effects of AFB1 on cell growth and invasion. In addition, AFB1 induced the expression of E2F1 and its knock-down could down-regulate H19 expression and suppress cell growth and invasion in hepatocellular carcinoma HepG2 cells. Furthermore, E2F1 over-expression could up-regulate H19 expression and promote cell growth and invasion, with binding to the H19 promoter being demonstrated by chromatin immunoprecipitation assays (ChIP). In summary, our results suggested that aflatoxin B1 could promote cell growth and invasion in hepatocellular carcinoma HepG2 cells through actions on H19 and E2F1.
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Affiliation(s)
- Jun Lv
- Department of Hepatobiliary Surgery, the First Affiliated Hospital of Sun Yat-Sen University, Guangzhou, China E-mail :
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Auerbach SS, Phadke DP, Mav D, Holmgren S, Gao Y, Xie B, Shin JH, Shah RR, Merrick BA, Tice RR. RNA-Seq-based toxicogenomic assessment of fresh frozen and formalin-fixed tissues yields similar mechanistic insights. J Appl Toxicol 2014; 35:766-80. [DOI: 10.1002/jat.3068] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2014] [Revised: 07/22/2014] [Accepted: 07/26/2014] [Indexed: 12/13/2022]
Affiliation(s)
- Scott S. Auerbach
- Biomolecular Screening Branch, Division of the National Toxicology Program; National Institute of Environmental Health Sciences; Research Triangle Park NC 27709 USA
| | | | | | - Stephanie Holmgren
- Library & Information Services Branch, Office of the Deputy Director; National Institute of Environmental Health Sciences; Research Triangle Park NC 27709 USA
| | - Yuan Gao
- Department of Biomedical Engineering; Johns Hopkins University; Baltimore MD 21205 USA
| | - Bin Xie
- Department of Biomedical Engineering; Johns Hopkins University; Baltimore MD 21205 USA
| | - Joo Heon Shin
- Department of Biomedical Engineering; Johns Hopkins University; Baltimore MD 21205 USA
| | | | - B. Alex Merrick
- Biomolecular Screening Branch, Division of the National Toxicology Program; National Institute of Environmental Health Sciences; Research Triangle Park NC 27709 USA
| | - Raymond R. Tice
- Biomolecular Screening Branch, Division of the National Toxicology Program; National Institute of Environmental Health Sciences; Research Triangle Park NC 27709 USA
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Zhang YW, Bao MH, Hu L, Qu Q, Zhou HH. Dose-response of oridonin on hepatic cytochromes P450 mRNA expression and activities in mice. JOURNAL OF ETHNOPHARMACOLOGY 2014; 155:714-720. [PMID: 24933226 DOI: 10.1016/j.jep.2014.06.009] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/08/2014] [Revised: 05/24/2014] [Accepted: 06/04/2014] [Indexed: 06/03/2023]
Abstract
ETHNOPHARMACOLOGICAL RELEVANCE Oridonin, the major terpene found in Rabdosia rubescens, is widely used as a dietary supplement or therapeutic drug. The effects of oridonin on drug processing genes, such as cytochrome P450 and nuclear receptors, were still unclear. Therefore, the present study investigated the influence of oridonin on the hepatic drug metabolizing system to evaluate the safety through its drug interaction potential. MATERIALS AND METHODS In this study, eight-week-old male C57BL/6 mice were treated oridonin orally (0, 25, 50, 100, 200 mg/kg, i.g.) for 15 days. The effects of oridonin on major Cyps in mice livers were examined at both the mRNA and enzyme activity levels. RESULTS In general, there are no significant influence of various dose of oridonin on mice liver function. However, oridonin significantly increased Cyps (1a, 2a, 2d, 2e, 2c and 3a family) mRNA expression. In addition, it could induce Cyps activity in microsome incubation at maximum dosage. To our knowledge, it is the first time to identify oridonin as a Cyps inducer in vivo. It also promotes the expression of CAR, PXR and POR. CONCLUSION These results indicate that, if studies in mice extrapolate to humans by orthologous genes, oridonin appears to be a risk to herb-drug interactions due to its induction effects on drug processing genes expression and activation.
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Affiliation(s)
- Yi-wen Zhang
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha 410008, China; Institute of Clinical Pharmacology, Xiangya School of Medicine, Central South University, 110 Xiangya Road, Changsha, Hunan 410078, China
| | - Mei-hua Bao
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha 410008, China; Institute of Clinical Pharmacology, Xiangya School of Medicine, Central South University, 110 Xiangya Road, Changsha, Hunan 410078, China; Department of Pharmacy, Changsha Medical University, Changsha 410219, China
| | - Lei Hu
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha 410008, China; Institute of Clinical Pharmacology, Xiangya School of Medicine, Central South University, 110 Xiangya Road, Changsha, Hunan 410078, China
| | - Qiang Qu
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha 410008, China; Institute of Clinical Pharmacology, Xiangya School of Medicine, Central South University, 110 Xiangya Road, Changsha, Hunan 410078, China
| | - Hong-hao Zhou
- Department of Clinical Pharmacology, Xiangya Hospital, Central South University, Changsha 410008, China; Institute of Clinical Pharmacology, Xiangya School of Medicine, Central South University, 110 Xiangya Road, Changsha, Hunan 410078, China.
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Mehrzad J, Devriendt B, Baert K, Cox E. Aflatoxin B1 interferes with the antigen-presenting capacity of porcine dendritic cells. Toxicol In Vitro 2014; 28:531-7. [DOI: 10.1016/j.tiv.2013.11.015] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2013] [Revised: 11/06/2013] [Accepted: 11/20/2013] [Indexed: 12/21/2022]
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Mehrzad J, Devriendt B, Baert K, Cox E. Aflatoxins of type B and G affect porcine dendritic cell maturationin vitro. J Immunotoxicol 2014; 12:174-80. [DOI: 10.3109/1547691x.2014.916366] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Mohammadi A, Mehrzad J, Mahmoudi M, Schneider M. Environmentally Relevant Level of Aflatoxin B1 Dysregulates Human Dendritic Cells Through Signaling on Key Toll-Like Receptors. Int J Toxicol 2014; 33:175-186. [DOI: 10.1177/1091581814526890] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Aflatoxins (AFs) are highly hazardous fungal biometabolites usually present in feeds and foods. Aflatoxin B1 (AFB1) is the most toxic and a known carcinogen. Toll-like receptors (TLRs), highly expressed by myeloid dendritic cells (DC), are key innate immune-surveillance molecules. Toll-like receptors not only sense pathogen-associated molecular patterns but also contribute to infections and cancer. To assess AFB1–TLR interactions on human myeloid DC, pure CD11c+ DC were generated from monocytes isolated from healthy individuals and then exposed to relevant level of AFB1 for 2 hours. Both quantitative polymerase chain reaction and flow cytometric assays were used to quantify, respectively, expression of TLR2 and TLR4 at the messenger RNA (mRNA) and protein levels in these DC. Levels of interleukin (IL) 1β, IL-6, and IL-10 were also analyzed in AFB1- and mock-treated DC. Compared to nontreated CD11c+ DC, expression levels of both TLR2 and TLR4 mRNA and proteins were significantly upregulated in AFB1-treated cells. Further, although IL-10 levels in AFB1-treated DC were similar to those in the mock-treated DC, the AFB1-exposed DC secreted higher amounts of IL-1β and IL-6. Dendritic cells are sensitive to environmentally relevant level of AFB1, and TLR2 and TLR4 are involved in sensing AFB1. Considering the broad roles of TLR2, TLR4, and DC in immunity and infections, our novel findings open a new door to understanding the molecular mechanisms and functional consequences of AFB1 in inducing immunodysregulation, immunotoxicity, and thus (non)infectious diseases in humans.
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Affiliation(s)
- Azam Mohammadi
- Department of Pathobiology, Sections Immunology and Biotechnology, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran
- Veterinary Biotechnology Research Group, Institute of Biotechnology, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Jalil Mehrzad
- Department of Pathobiology, Sections Immunology and Biotechnology, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad, Mashhad, Iran
- Veterinary Biotechnology Research Group, Institute of Biotechnology, Ferdowsi University of Mashhad, Mashhad, Iran
| | - Mahmoud Mahmoudi
- Immunology Research Center, School of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Marion Schneider
- Sektion Experimentelle Anästhesiologie, Universitätsklinikum Ulm, Ulm, Germany
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Niu Y, Wu Z, Shen Q, Song J, Luo Q, You H, Shi G, Qin W. Hepatitis B virus X protein co-activates pregnane X receptor to induce the cytochrome P450 3A4 enzyme, a potential implication in hepatocarcinogenesis. Dig Liver Dis 2013; 45:1041-8. [PMID: 23891548 DOI: 10.1016/j.dld.2013.06.004] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/18/2013] [Revised: 05/16/2013] [Accepted: 06/10/2013] [Indexed: 02/05/2023]
Abstract
BACKGROUND Hepatitis B virus X protein is a key regulator of hepatocarcinogenesis. The pregnane X receptor is a xenobiotic nuclear receptor that plays a role in the regulation of drug-metabolizing enzymes including the cytochrome P450 3A4, an enzyme important for the bioactivation of the liver carcinogen aflatoxin B1. AIMS To identify novel host factor that interacts with hepatitis B virus X protein and the functional interaction between hepatitis B virus X protein and pregnane X receptor in hepatocarcinogenesis. METHODS Co-immunoprecipitation, glutathione S-transferase pull-down, and chromatin immunoprecipitation were utilized to assess the interaction between hepatitis B virus X protein and pregnane X receptor. The functional relevance of hepatitis B virus X protein-pregnane X receptor interaction was investigated in cell cultures and hepatocellular carcinoma samples. RESULTS We observed that hepatitis B virus X protein and pregnane X receptor co-localize in hepatic cells. Pregnane X receptor interacted with hepatitis B virus X protein via the ligand-binding domain of pregnane X receptor. Functionally, hepatitis B virus X protein increased the transcriptional activity of pregnane X receptor. Pregnane X receptor was able to recruit hepatitis B virus X protein to the CYP3A4 gene promoter. In clinic samples, the expression of pregnane X receptor was high in hepatitis B virus-associated liver cirrhosis and stage I hepatocellular carcinoma, but low in state II and stage III hepatocellular carcinoma. CONCLUSION We revealed a novel function of hepatitis B virus X protein in co-activating pregnane X receptor. The increased expression of pregnane X receptor and its target gene CYP3A4 are potential biomarkers for the early stage of hepatitis B virus-associated hepatocarcinogenesis.
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Affiliation(s)
- Yongdong Niu
- State Key Laboratory of Oncogenes and Related Genes, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, China; Department of Pharmacology, Shantou University Medical College, Guangdong, China.
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Bahari A, Mehrzad J, Mahmoudi M, Bassami MR, Dehghani H. Cytochrome P450 isoforms are differently up-regulated in aflatoxin B₁-exposed human lymphocytes and monocytes. Immunopharmacol Immunotoxicol 2013; 36:1-10. [PMID: 24168324 DOI: 10.3109/08923973.2013.850506] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
CONTEXT Aflatoxins (AFs) are highly hazardous mycotoxins with potent carcinogenic, mutagenic and immune disregulatory properties. Cytochrome P450 (CYP) isoforms are central for enhanced AFB₁ toxicity in situ. It remains to be seen whether and how these AFB₁ activators work in human leukocytes. OBJECTIVE To investigate the involvement of CYP isoforms in AFB₁ toxicity of circulating mononuclear cells, we examined the impact of environmentally relevant levels of AFB1 on lymphocytes and monocytes. MATERIALS AND METHODS Very low and moderate doses of AFB₁ with/without CYP inducers on transcription of key CYP isoforms and toll-like receptor 4 (TLR4) were examined in human lymphocytes, monocytes and HepG2 cells; cell cycle distribution and viability were also analyzed in AFB₁-exposed lymphocytes and monocytes. RESULTS Only CYP1A1, CYP1B1, CYP3A4, CYP3A5 and CYP3A7 expressed in lymphocytes and monocytes. TLR4 much more expressed in monocytes than in lymphocytes, but HepG2 showed little TLR4 transcription. While CYP1A1, CYP1B1 and CYP3A4 were highly induced by AFB₁ in monocytes, in lymphocytes only CYP1A1 was induced. Among CYP1A1, CYP1B1 and CYP3A4 only CYP1A1 responded to low and moderate levels of AFB₁. Enhanced transcripts of CYPs by AFB₁ yielded little synergies on TLR4 transcription in lymphocytes and monocytes. Cell cycle arrest and necrosis were also detected in AFB₁-exposed lymphocytes and monocytes. CONCLUSIONS Our novel findings indicate that AFB₁ more intensively stimulates CYP genes expression in monocytes than in lymphocytes. Mechanistically, this could explain a more pronounced immunotoxicity of AFB₁ in myeloid than in lymphoid lineage cells in vitro/situ/vivo.
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Affiliation(s)
- Abbas Bahari
- Department of Pathobiology, Section Immunology, Faculty of Veterinary Medicine, Ferdowsi University of Mashhad , Mashhad , Iran
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Jetten M, Kleinjans J, Claessen S, Chesné C, van Delft J. Baseline and genotoxic compound induced gene expression profiles in HepG2 and HepaRG compared to primary human hepatocytes. Toxicol In Vitro 2013; 27:2031-40. [DOI: 10.1016/j.tiv.2013.07.010] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2013] [Revised: 07/12/2013] [Accepted: 07/22/2013] [Indexed: 12/31/2022]
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Pimkaew P, Suksen K, Somkid K, Chokchaisiri R, Jariyawat S, Chuncharunee A, Suksamrarn A, Piyachaturawat P. Zederone, a Sesquiterpene from Curcuma elata Roxb, is Hepatotoxic in Mice. Int J Toxicol 2013; 32:454-62. [DOI: 10.1177/1091581813504595] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Abstract
The present study aimed to investigate the hepatotoxicity of zederone isolated from Curcuma elata in mice. Adult male mice were intraperitoneally injected with a single dose of zederone (50-300 mg/kg body weight [BW]). Twenty-four hours after the injection, zederone induced liver enlargement with scattered white foci over the organ. The medium lethal dose (LD50) value at 24 hours of zederone was approximately 223 mg/kg BW. Hepatic centrilobular necrosis with marked increases in plasma alanine transaminase activity and total bilirubin levels was observed. Zederone at a dose of 200 mg/kg BW markedly decreased the activity of superoxide dismutase and the hepatic glutathione content, whereas the activity of catalase was not altered. The compound at this dose also increased the messenger RNA (mRNA) expression of Cyp2b10 and Cyp3a11, which are the main drug-metabolizing enzymes in the liver. The mRNA expression of proinflammatory cytokine tumor necrosis factor α was increased. The nuclear factor-E2-related factor 2 protein, which is the transcription factor regulating the antioxidant gene expression, was decreased. The histopathology of massive hepatic centrilobular necrosis with an increase in the expression of cytochrome P450 (Cyp) suggests that the possible potentiation of zederone-induced hepatotoxicity implicated the induction of Cyps, which leads to the formation of biological reactive metabolites and that cause the oxidative stress and liver cell injuries.
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Affiliation(s)
- Prapapan Pimkaew
- Toxicology Graduate Program, Faculty of Science, Mahidol University, Bangkok, Thailand
- Department of Physiology, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Kanoknetr Suksen
- Department of Physiology, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Koravit Somkid
- Toxicology Graduate Program, Faculty of Science, Mahidol University, Bangkok, Thailand
- Department of Physiology, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Ratchanaporn Chokchaisiri
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Ramkhamhaeng University, Bangkok, Thailand
- Division of Chemistry, School of Science, University of Phayao, Phayao, Thailand
| | - Surawat Jariyawat
- Department of Physiology, Faculty of Science, Mahidol University, Bangkok, Thailand
| | - Aporn Chuncharunee
- Department of Anatomy, Faculty of Medicine, Siriraj Hospital, Mahidol University, Bangkok, Thailand
| | - Apichart Suksamrarn
- Department of Chemistry and Center of Excellence for Innovation in Chemistry, Faculty of Science, Ramkhamhaeng University, Bangkok, Thailand
| | - Pawinee Piyachaturawat
- Toxicology Graduate Program, Faculty of Science, Mahidol University, Bangkok, Thailand
- Department of Physiology, Faculty of Science, Mahidol University, Bangkok, Thailand
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Iwanaga K, Honjo T, Miyazaki M, Kakemi M. Time-dependent changes in hepatic and intestinal induction of cytochrome P450 3A after administration of dexamethasone to rats. Xenobiotica 2013; 43:765-73. [PMID: 23339625 DOI: 10.3109/00498254.2012.761741] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
We investigated the effects of the dose of and the number of times an inducer was administered and the duration of induction of hepatic and intestinal cytochrome P450 3A (CYP3A) in rats using dexamethasone 21-phosphate (DEX-P) and midazolam (MDZ) as an inducer and a substrate to CYP3A, respectively. The number of times DEX-P was administered was not a significant factor in the induction of either hepatic or intestinal CYP3A; however, administration of DEX-P multiple times markedly decreased the bioavailability of DEX-P by self-induction of CYP3A. CYP3A induction in the liver increased depending on the dose of DEX-P, whereas that in intestine showed a mild increase, but the induction level was almost constant regardless of the dose of DEX-P. Administration of a single dose of DEX-P showed a temporal increase in CYP3A activity in both tissues and the induction ratios reached maximum values at 12 h after DEX-P administration. On the other hand, a mild increase of CYP3A activity, which lasted for at least 48 h, was observed in both tissues after administration of multiple doses. Some physiological compounds such as cytokines might be involved in decreasing the CYP3A activity to maintain homeostasis of the body.
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Affiliation(s)
- Kazunori Iwanaga
- Division of Pharmaceutics, Osaka University of Pharmaceutical Sciences, Nasahara, Takatsuki, Osaka, Japan.
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