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Wang S, Ren H, Fan C, Lin Q, Liu M, Tian J. Ochratoxin A Induces Renal Cell Ferroptosis by Disrupting Iron Homeostasis and Increasing ROS. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2024; 72:1734-1744. [PMID: 38133486 DOI: 10.1021/acs.jafc.3c04495] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/23/2023]
Abstract
Mycotoxin ochratoxin A (OTA) is a critical food safety concern due to its nephron-toxic effects and is detected in a wide range of food and feedstuffs. OTA nephrotoxicity is related to oxidative stress and damage. However, the mediator(s) of the excessive oxidative stress is unclear. The current study used human kidney cell lines to investigate whether and how intracellular iron contributed to OTA-induced ROS accumulation and how OTA-induced iron-dependent ferroptotic cell death. Our results showed that OTA treatment affected the cell viability and induced the typical characteristics of cell ferroptosis. Furthermore, gene and protein expression results indicated that OTA disrupted iron homeostasis by upregulating the expression levels of iron importer TFR1 and FTH, while downregulating the expression level of iron exporter FPN and dramatically increasing its negative regulator Hepcidin. The changes were consistent with the induction of intracellular iron accumulation and elevated levels of oxidative stress and lipid peroxidation. Additionally, co-treatment with OTA and an iron chelator significantly improved cell viability, reduced cellular total iron and ROS, and reversed OTA-induced changes in iron metabolism gene expression levels. Interestingly, the addition of a ROS scavenger also reversed cell death and changes in mRNA and protein expression levels of iron metabolism genes but to a lesser degree than that of the iron-chelating agent. Our results revealed that OTA induced ferroptosis in renal cells by disrupting iron homeostasis and increasing ROS.
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Affiliation(s)
- Sen Wang
- International Cooperation Joint Laboratory of Jiangsu Province Colleges and Universities, School of Life Sciences, Jiangsu Normal University, Xuzhou, Jiangsu Province 221116, China
| | - Hui Ren
- International Cooperation Joint Laboratory of Jiangsu Province Colleges and Universities, School of Life Sciences, Jiangsu Normal University, Xuzhou, Jiangsu Province 221116, China
| | - Chen Fan
- International Cooperation Joint Laboratory of Jiangsu Province Colleges and Universities, School of Life Sciences, Jiangsu Normal University, Xuzhou, Jiangsu Province 221116, China
| | - Qian Lin
- International Cooperation Joint Laboratory of Jiangsu Province Colleges and Universities, School of Life Sciences, Jiangsu Normal University, Xuzhou, Jiangsu Province 221116, China
| | - Man Liu
- International Cooperation Joint Laboratory of Jiangsu Province Colleges and Universities, School of Life Sciences, Jiangsu Normal University, Xuzhou, Jiangsu Province 221116, China
| | - Jun Tian
- International Cooperation Joint Laboratory of Jiangsu Province Colleges and Universities, School of Life Sciences, Jiangsu Normal University, Xuzhou, Jiangsu Province 221116, China
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Cui H, Yang W, He S, Chai Z, Wang L, Zhang G, Zou P, Sun L, Yang H, Chen Q, Liu J, Cao J, Ling X, Ao L. TERT transcription and translocation into mitochondria regulate benzo[a]pyrene/BPDE-induced senescence and mitochondrial damage in mouse spermatocytes. Toxicol Appl Pharmacol 2023; 475:116656. [PMID: 37579952 DOI: 10.1016/j.taap.2023.116656] [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: 03/04/2023] [Revised: 08/07/2023] [Accepted: 08/11/2023] [Indexed: 08/16/2023]
Abstract
Telomere and mitochondria may be the targets of Benzo[a]pyrene (BaP) -induced male reproductive damage, and further elucidation of the toxic molecular mechanisms is necessary. In this study, we used in vivo and in vitro exposure models to explore the molecular mechanisms of TERT regulation in BaP-induced telomere and mitochondrial damage in spermatocytes. The results showed that the treatment of benzo[a]pyrene-7,8-dihydrodiol-9,10-epoxide (BPDE), the active metabolite of BaP, caused telomere dysfunction in mouse spermatocyte-derived GC-2 cells, resulting in S-phase arrest and increased senescence-associated secretory phenotype (SASP). These effects were significantly alleviated by telomerase agonist (ABG) pretreatment in GC-2 cells. SIRT1, FOXO3a, or c-MYC overexpressing GC-2 cell models were established to demonstrate that BPDE inhibited TERT transcriptional expression through the SIRT1/FOXO3a/c-MYC pathway, leading to telomere dysfunction. We also observed that BPDE induced mitochondrial compromise, including complex I damage, accompanied by reduced mitochondrial TERT expression. Based on this, we constructed wild-type TERT-overexpressing (OE-TERTwt) and mitochondria targeting TERT-overexpressing (OE-TERTmst) GC-2 cell models and found that OE-TERTmst GC-2 cells improved mitochondrial function better than OE-TERTwt GC-2 cells. Finally, ICR mice were given BaP by intragastric administration for 35 days, which verified the results of the in vitro study. The results shown that BaP exposure can lead to spermatogenesis disturbance, which is related to the telomere and mitochondrial damage in spermatocytes. In conclusion, our results suggest that BPDE causes telomere and mitochondrial damage in spermatocytes by inhibiting TERT transcription and mitochondrial TERT expression. This study elucidates the molecular mechanism of male reproductive toxicity due to environmental pollutant BaP, and also provides a new perspective for the exploration of interventions and protective measures against male reproductive damage by BaP.
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Affiliation(s)
- Haonan Cui
- Key Lab of Medical Protection for Electromagnetic Radiation, Ministry of Education of China, Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing 400038, China
| | - Wang Yang
- Key Lab of Medical Protection for Electromagnetic Radiation, Ministry of Education of China, Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing 400038, China
| | - Shijun He
- Key Lab of Medical Protection for Electromagnetic Radiation, Ministry of Education of China, Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing 400038, China
| | - Zili Chai
- State Key Laboratory of Pathogen and Biosecurity, Beijing Institute of Biotechnology, Beijing, China
| | - Lihong Wang
- West China School of Public Health, Sichuan University, Chengdu 610041, China
| | - Guowei Zhang
- Department of Environmental Health, College of Preventive Medicine, Third Military Medical University, Chongqing 400038, China
| | - Peng Zou
- Key Lab of Medical Protection for Electromagnetic Radiation, Ministry of Education of China, Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing 400038, China
| | - Lei Sun
- Key Lab of Medical Protection for Electromagnetic Radiation, Ministry of Education of China, Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing 400038, China
| | - Huan Yang
- Key Lab of Medical Protection for Electromagnetic Radiation, Ministry of Education of China, Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing 400038, China
| | - Qing Chen
- Key Lab of Medical Protection for Electromagnetic Radiation, Ministry of Education of China, Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing 400038, China
| | - Jinyi Liu
- Key Lab of Medical Protection for Electromagnetic Radiation, Ministry of Education of China, Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing 400038, China
| | - Jia Cao
- Key Lab of Medical Protection for Electromagnetic Radiation, Ministry of Education of China, Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing 400038, China
| | - Xi Ling
- Key Lab of Medical Protection for Electromagnetic Radiation, Ministry of Education of China, Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing 400038, China.
| | - Lin Ao
- Key Lab of Medical Protection for Electromagnetic Radiation, Ministry of Education of China, Institute of Toxicology, College of Preventive Medicine, Third Military Medical University, Chongqing 400038, China.
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Li J, Deng Y, Wang Y, Nepovimova E, Wu Q, Kuca K. Mycotoxins Have a Potential of Inducing Cell Senescence: A New Understanding of Mycotoxin Immunotoxicity. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2023:104188. [PMID: 37331672 DOI: 10.1016/j.etap.2023.104188] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Revised: 06/10/2023] [Accepted: 06/15/2023] [Indexed: 06/20/2023]
Abstract
Mycotoxins result in immune dysfunction and cause immune diseases in animals and humans. However, the mechanisms of immunotoxicity involved in mycotoxins have not been fully explored, and emerging evidence suggests that these toxins may promote their immunotoxicity via cellular senescence. Mycotoxins induce cell senescence after DNA damage, and activate signaling via the NF-κB and JNK pathways to promote the secretion of senescence-associated secretory phenotype (SASP) cytokines including IL-6, IL-8, and TNF-α. DNA damage can also over-activate or cleave poly (ADP-ribose) polymerase-1 (PARP-1), increase the expression of cell cycle inhibitory proteins p21, and p53, and induce cell cycle arrest and then senescence. These senescent cells further down-regulate proliferation-related genes and overexpress inflammatory factors resulting in chronic inflammation and eventual immune exhaustion. Here we review the underlying mechanisms by which mycotoxins trigger cell senescence and the potential roles of SASP and PARP in these pathways. This work will help to further understand the mechanisms of immunotoxicity involved in mycotoxins.
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Affiliation(s)
- Jiefeng Li
- College of Life Science, Yangtze University, Jingzhou 434025, China
| | - Ying Deng
- College of Life Science, Yangtze University, Jingzhou 434025, China
| | - Yating Wang
- College of Life Science, Yangtze University, Jingzhou 434025, China
| | - Eugenie Nepovimova
- Department of Chemistry, Faculty of Science, University of Hradec Králové, Hradec Králové 50003, Czech Republic
| | - Qinghua Wu
- College of Life Science, Yangtze University, Jingzhou 434025, China; Department of Chemistry, Faculty of Science, University of Hradec Králové, Hradec Králové 50003, Czech Republic.
| | - Kamil Kuca
- Department of Chemistry, Faculty of Science, University of Hradec Králové, Hradec Králové 50003, Czech Republic; Andalusian Research Institute in Data Science and Computational Intelligence (DaSCI), University of Granada, Granada, Spain; Biomedical Reseaerch Center, University Hospital Hradec Kralove, 500 05 Hradec Kralove, Czech Republic.
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Liu WC, Pushparaj K, Meyyazhagan A, Arumugam VA, Pappusamy M, Bhotla HK, Baskaran R, Issara U, Balasubramanian B, Khaneghah AM. Ochratoxin A as alarming health in livestock and human: A review on molecular interactions, mechanism of toxicity, detection, detoxification, and dietary prophylaxis. Toxicon 2022; 213:59-75. [PMID: 35452686 DOI: 10.1016/j.toxicon.2022.04.012] [Citation(s) in RCA: 21] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Revised: 03/22/2022] [Accepted: 04/14/2022] [Indexed: 10/18/2022]
Abstract
Ochratoxin A (OTA) is a toxic metabolite produced by Aspergillus and Penicillium fungi commonly found in raw plant sources and other feeds. This review comprises an extensive evaluation of the origin and proprieties of OTA, toxicokinetics, biotransformation, and toxicodynamics of ochratoxins. In in vitro and in vivo studies, the compatibility of OTA with oxidative stress is observed through the production of free radicals, resulting in genotoxicity and carcinogenicity. The OTA leads to nephrotoxicity as the chief target organ is the kidney. Other OTA excretion and absorption rates are observed, and the routes of elimination include faeces, urine, and breast milk. The alternations in the Phe moiety of OTA are the precursor for the amino acid alternation, bringing about Phe-hydroxylase and Phe-tRNA synthase, resulting in the complete dysfunction of cellular metabolism. Biodetoxification using specific microorganisms decreased the DNA damage, lipid peroxidation, and cytotoxicity. This review addressed the ability of antioxidants and the dietary components as prophylactic measures to encounter toxicity and demonstrated their capability to counteract the chronic exposure through supplementation as feed additives.
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Affiliation(s)
- Wen-Chao Liu
- Department of Animal Science, College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang, 524088, PR China
| | - Karthika Pushparaj
- Department of Zoology, School of Biosciences, Avinashilingam Institute for Home Science and Higher Education for Women, Coimbatore, 641 043, Tamil Nadu, India
| | - Arun Meyyazhagan
- Department of Life Science, CHRIST (Deemed to be University), Bengaluru, Karnataka, 560076, India.
| | - Vijaya Anand Arumugam
- Department of Human Genetics and Molecular Biology, Bharathiar University, Coimbatore, 641 046, Tamil Nadu, India
| | - Manikantan Pappusamy
- Department of Life Science, CHRIST (Deemed to be University), Bengaluru, Karnataka, 560076, India
| | - Haripriya Kuchi Bhotla
- Department of Animal Science, College of Coastal Agricultural Sciences, Guangdong Ocean University, Zhanjiang, 524088, PR China
| | - Rathinasamy Baskaran
- Department of Bioinformatics and Medical Engineering, Asia University, Taichung, Taiwan
| | - Utthapon Issara
- Division of Food Science and Technology Management, Faculty of Science and Technology, Rajamangala University of Technology Thanyaburi, Pathum Thani, 12110, Thailand
| | | | - Amin Mousavi Khaneghah
- Department of Food Science, Faculty of Food Engineering, State University of Campinas (UNICAMP), Campinas, São Paulo, Brazil.
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Mao X, Li H, Ge L, Liu S, Hou L, Yue D, Du H, Pan C, Gan F, Liu Y, Huang K, Chen X. Selenomethionine alleviated Ochratoxin A induced pyroptosis and renal fibrotic factors expressions in MDCK cells. J Biochem Mol Toxicol 2021; 36:e22933. [PMID: 34676619 DOI: 10.1002/jbt.22933] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/26/2021] [Revised: 09/07/2021] [Accepted: 10/06/2021] [Indexed: 01/30/2023]
Abstract
Ochratoxin A (OTA) is universally known to induce nephrotoxicity via inducing oxidative stress and apoptosis, inhibiting protein synthesis and activating autophagy. Our previous studies have proved that OTA induces nephrotoxicity in vitro and in vivo by adjusting the NOD-like receptor protein 3 (NLRP3) inflammasome activation and caspase-1-dependent pyroptosis. Based on these findings, we further investigated the protective role of selenomethionine (SeMet) on OTA-caused nephrotoxicity using the Madin-Darby canine kidney (MDCK) epithelial cells as an in vitro model, proposing to offer a new way for remedying OTA-induced nephrotoxicity by nutritional manipulation. We measured the cell vitality, lactate dehydrogenase (LDH) activity and the expression of renal fibrotic genes, NLRP3 inflammasome and pyroptosis related genes. MTT and LDH results indicated that SeMet supplementation significantly mitigated 2.0 μg/ml OTA-induced cytotoxicity in MDCK cells (p < 0.05). Meanwhile, SeMet alleviated OTA induced increase of reactive oxygen species in MDCK cells. Then, the expressions of α-SMA, Vimentin, and TGF-β were detected both in mRNA and protein levels. The results indicated 8 μM SeMet supplementation could significantly downregulate the expression of OTA-induced renal fibrosis-related genes (p < 0.05). In addition, the upregulation of OTA-induced NLRP3 inflammasome and pyroptosis downstream genes was also significantly inhibited by 8 μM of SeMet (p < 0.05). In summary, SeMet could alleviate OTA-induced renal fibrotic genes expression and reduce NLRP3-caspase-1-dependent pyroptosis. Therefore, SeMet supplementation may become an effective approach for preserving animals from renal injury exposed to OTA.
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Affiliation(s)
- Xinru Mao
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China.,Institute of Animal Nutrition and Health, Nanjing Agricultural University, Nanjing, China
| | - Hu Li
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China.,Institute of Animal Nutrition and Health, Nanjing Agricultural University, Nanjing, China
| | - Lei Ge
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China.,Institute of Animal Nutrition and Health, Nanjing Agricultural University, Nanjing, China
| | - Shuiping Liu
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China.,Institute of Animal Nutrition and Health, Nanjing Agricultural University, Nanjing, China
| | - Lili Hou
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China.,Institute of Animal Nutrition and Health, Nanjing Agricultural University, Nanjing, China
| | - Dongmei Yue
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China.,Institute of Animal Nutrition and Health, Nanjing Agricultural University, Nanjing, China
| | - Heng Du
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China.,Institute of Animal Nutrition and Health, Nanjing Agricultural University, Nanjing, China
| | - Cuiling Pan
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China.,Institute of Animal Nutrition and Health, Nanjing Agricultural University, Nanjing, China
| | - Fang Gan
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China.,Institute of Animal Nutrition and Health, Nanjing Agricultural University, Nanjing, China
| | - Yunhuan Liu
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China.,Institute of Animal Nutrition and Health, Nanjing Agricultural University, Nanjing, China
| | - Kehe Huang
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China.,Institute of Animal Nutrition and Health, Nanjing Agricultural University, Nanjing, China
| | - Xingxiang Chen
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, China.,Institute of Animal Nutrition and Health, Nanjing Agricultural University, Nanjing, China
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Ochratoxin A-Induced Nephrotoxicity: Up-to-Date Evidence. Int J Mol Sci 2021; 22:ijms222011237. [PMID: 34681895 PMCID: PMC8539333 DOI: 10.3390/ijms222011237] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 10/13/2021] [Accepted: 10/15/2021] [Indexed: 02/07/2023] Open
Abstract
Ochratoxin A (OTA) is a mycotoxin widely found in various foods and feeds that have a deleterious effect on humans and animals. It has been shown that OTA causes multiorgan toxicity, and the kidney is the main target of OTA among them. This present article aims to review recent and latest intracellular molecular interactions and signaling pathways of OTA-induced nephrotoxicity. Pyroptosis, lipotoxicity, organic anionic membrane transporter, autophagy, the ubiquitin-proteasome system, and histone acetyltransferase have been involved in the renal toxicity caused by OTA. Meanwhile, the literature reviewed the alternative or method against OTA toxicity by reducing ROS production, oxidative stress, activating the Nrf2 pathway, through using nanoparticles, a natural flavonoid, and metal supplement. The present review discloses the molecular mechanism of OTA-induced nephrotoxicity, providing opinions and strategies against OTA toxicity.
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Zhu L, Wang H, Yuhan J, Zhang B, Li H, Asakiya C, Huang K, He X, Xu W. Exosomes mediated the delivery of ochratoxin A-induced cytotoxicity in HEK293 cells. Toxicology 2021; 461:152926. [PMID: 34481902 DOI: 10.1016/j.tox.2021.152926] [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: 04/21/2021] [Revised: 08/23/2021] [Accepted: 09/01/2021] [Indexed: 10/20/2022]
Abstract
Ochratoxin A (OTA) is one of the mycotoxins, which widely pollutes food systems and seriously threatens human health. OTA's target organ is the kidney. Exosome, as one of the extracellular vesicles, could be secreted by all kinds of cells. It contains different proteins, nucleic acid, and lipid, which are decided by their donor cells and could be uptake by the recipient cells, release their contents, and affect the recipient cell's life activity. In this study, a 24 h-treatment with 5 μM OTA was found to significantly reduce the cell viability of HEK293 cells and meanwhile to provide a sufficient quantity of exosomes, thus this concentration and time were selected for subsequent experiments. In addition, exosomes extracted by ultracentrifugation had higher purity, fewer impurities, and uniform morphology than that by the ExoQuick-TC kit. Furthermore, these exosomes increased ROS levels and decreased mitochondrial membrane potential in HEK293 cells. By RNA-seq, the cytotoxicity mechanisms induced by OTA-treated HEK293 cell-derived exosomes (EXO-OTA) and OTA were mainly the metabolism of proteins and the cell cycle respectively. Also, it proved that exosomes deliver partial OTA-induced cytotoxicity.
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Affiliation(s)
- Liye Zhu
- Key Laboratory of Precision Nutrition and Food Quality, Department of Nutrition and Health, China Agricultural University, Beijing, 100083, China; College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China
| | - Haomiao Wang
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China
| | - Jieyu Yuhan
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China
| | - Boyang Zhang
- Key Laboratory of Precision Nutrition and Food Quality, Department of Nutrition and Health, China Agricultural University, Beijing, 100083, China; College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China
| | - Hongyu Li
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China
| | - Charles Asakiya
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China
| | - Kunlun Huang
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China
| | - Xiaoyun He
- College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China
| | - Wentao Xu
- Key Laboratory of Precision Nutrition and Food Quality, Department of Nutrition and Health, China Agricultural University, Beijing, 100083, China.
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Dong F, Xiao P, Li X, Chang P, Zhang W, Wang L. Cadmium triggers oxidative stress and mitochondrial injury mediated apoptosis in human extravillous trophoblast HTR-8/SVneo cells. Reprod Toxicol 2021; 101:18-27. [PMID: 33588013 DOI: 10.1016/j.reprotox.2021.02.003] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2019] [Revised: 01/16/2021] [Accepted: 02/09/2021] [Indexed: 12/25/2022]
Abstract
Cadmium (Cd) is a bioaccumulative heavy metal element with potential placental toxicity during pregnancy. Up to now, however, the precise toxic effects of Cd on human placentae, particularly as they pertain to trophoblast cells remain obscure. We therefore sought to investigate the cytotoxic effects of Cd on human extravillous trophoblast HTR-8/SVneo cells and the mechanisms involved in the processes. Results in this present study showed that CdCl2 treatment significantly suppressed cell viability and induced noticeable oxidative stress in HTR-8/SVneo cells. Further studies showed that CdCl2 treatment caused distortion of mitochondrial structure, reduction of mitochondrial membrane potential (Δψm), DNA damage and G0/G1 phase arrest. Under the same condition, CdCl2 treatment increased Bax/Bcl-2 ratios by up-regulating Bax expression and down-regulating Bcl-2 expression, and activated apoptotic executive molecule caspase-3, which irreversibly induced HTR-8/SVneo cell apoptosis. N-acetyl-l-cysteine (NAC), ROS scavenger, significantly attenuated CdCl2-caused mitochondrial injury, DNA damage, G0/G1 phase arrest and apoptosis. In addition, in vivo assay suggested that CdCl2 induced trophoblast cells apoptosis but not other cells in mice placental tissue. Taken together, these data suggest that Cd selectively triggers oxidative stress and mitochondrial injury mediated apoptosis in trophoblast cells, which might contribute to placentae impairment and placental-related disorders after Cd exposure. These findings may provide new insights to understand adverse effects of Cd on placentae during pregnancy.
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Affiliation(s)
- Feng Dong
- College of Life Science, Shanxi University, Taiyuan, Shanxi 030006, PR China.
| | - Pan Xiao
- College of Life Science, Shanxi University, Taiyuan, Shanxi 030006, PR China
| | - Xiangyang Li
- College of Life Science, Shanxi University, Taiyuan, Shanxi 030006, PR China
| | | | - Wenyi Zhang
- College of Life Science, Shanxi University, Taiyuan, Shanxi 030006, PR China
| | - Lan Wang
- College of Life Science, Shanxi University, Taiyuan, Shanxi 030006, PR China.
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Pourhajibagher M, Etemad-Moghadam S, Alaeddini M, Bahador A. Modulation of the triggered apoptosis by nano emodin transfersome-mediated sonodynamic therapy on head and neck squamous cell carcinoma cell lines. Photodiagnosis Photodyn Ther 2021; 34:102253. [PMID: 33711532 DOI: 10.1016/j.pdpdt.2021.102253] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2020] [Revised: 02/14/2021] [Accepted: 03/05/2021] [Indexed: 12/19/2022]
Abstract
BACKGROUND Non-invasive sonodynamic therapy (SDT) is a new treatment modality that uses low-intensity ultrasound to activate a non-toxic sensitizing chemical agent for cancer therapy in a site-directed manner. This study aimed to investigate the anti-cancer effects of ultrasound combined with nano emodin transfersome (NET) on head and neck squamous cell carcinoma (HNSCC) cell lines. MATERIALS AND METHODS A transfersome form of nano emodin as a novel sono-responsive nanomaterial was synthesized to enhance the accumulation and penetration of nanoparticles. iIn vitro experiments including hemolytic activity, cell proliferation, intracellular reactive oxygen species (ROS) generation, apoptosis induction, DNA fragmentation, and mRNA expressions of caspase 3 and 9 were conducted to explore the anti-cancer effects of NET-SDT on FaDu and CAL-27 cell lines. RESULTS Characterization tests showed the round and uniform morphology of NET with transfersome structure, resulting in a high drug-loading content and encapsulation efficiency. No significant hemolytic activity was observed (P > 0.05). Cytotoxicity gradually increased with increasing concentrations of NET, so that 10 × 10-4 g/L of NET plus 5 min ultrasound irradiation at a frequency of 1 MHz and ultrasonic intensity of 2 W/cm2 effectively killed 98.2 % and 97.3 % of FaDu and CAL-27 cell lines, respectively (P < 0.05). We found that ROS generation in NET-SDT was dose-dependent and the triggered apoptosis and caspase-3/9 gene expression levels were significantly enhanced as the concentration of NET increased (P < 0.05). No significant difference was found in the rate of apoptosis induction and gene expression between two cell lines. CONCLUSIONS Our data demonstrated that SDT with NET as a sonosensitizer can induce apoptosis and significantly decrease cell viability of HNSCC cell lines, which represents the role of NET-SDT as a potent anti-cancer modality.
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Affiliation(s)
- Maryam Pourhajibagher
- Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Shahroo Etemad-Moghadam
- Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Mojgan Alaeddini
- Dental Research Center, Dentistry Research Institute, Tehran University of Medical Sciences, Tehran, Iran
| | - Abbas Bahador
- Oral Microbiology Laboratory, Department of Microbiology, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran; Fellowship in Clinical Laboratory Sciences, Iran University of Medical Sciences, Tehran, Iran.
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Ochratoxin A induces nephrotoxicity in vitro and in vivo via pyroptosis. Arch Toxicol 2021; 95:1489-1502. [PMID: 33543323 DOI: 10.1007/s00204-021-02993-6] [Citation(s) in RCA: 27] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2020] [Accepted: 01/28/2021] [Indexed: 01/12/2023]
Abstract
Ochratoxin A (OTA), a prevalent nephrotoxic mycotoxin contaminant in food and feedstuff, has been reported to induce renal injury. To disclose the nephrotoxicity of continuous administration of OTA and to investigate potential mechanisms related to pyroptosis, male C57BL/6 mice were intraperitoneally injected with 1.0 and 2.0 mg/kg B.W. OTA every other day for 14 days. At 2.0 mg/kg B.W. OTA administration significantly increased histological injury and renal fibrosis molecules (α-SMA, Vimentin, TGF-β) and activated the NOD-like receptor protein 3 (NLRP3) inflammasome and induced pyroptosis compared with control. In the in vitro tests, Madin-Darby canine kidney (MDCK) epithelial cells were exposed to 0-4.0 μg/ml OTA for 24 h in serum-free medium. Data showed that OTA dose-dependently affected cell viability and significantly up-regulated renal fibrosis genes (α-SMA, Vimentin, TGF-β). 2.0 μg/ml OTA significantly induced NLRP3 inflammasome activation and caspase-1-dependent pyroptosis, increasing the expression and secretion of pro-inflammatory cytokines (IL-6, TNF-α) and pyroptosis-related genes (GSDMD, IL-1β, IL-18) in MDCK cells. These outcomes were significantly abrogated after inhibiting NLRP3 activation with inhibitor MCC950 and silencing NLRP3 with small interfering RNA (siRNA). Furthermore, knockdown of caspase-1 also ameliorated OTA-induced renal fibrosis via the inhibition of pyroptosis. Collectively, the chosen doses of OTA-triggered nephrotoxicity through NLRP3 inflammasome activation and caspase-1-dependent pyroptosis both in vitro and in vivo.
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Liu T, Fang K, Liu Y, Zhang X, Han L, Wang X. Enantioselective residues and toxicity effects of the chiral triazole fungicide hexaconazole in earthworms (Eisenia fetida). ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 270:116269. [PMID: 33338958 DOI: 10.1016/j.envpol.2020.116269] [Citation(s) in RCA: 35] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/12/2020] [Revised: 11/29/2020] [Accepted: 12/07/2020] [Indexed: 06/12/2023]
Abstract
The enantioselective toxic effect and environmental behavior of chiral pesticides have attracted increasing research attention. In this study, the enantioselective toxicity and residues of hexaconazole (HEX) in earthworms (Eisenia fetida) were investigated. In the present study, significant enantioselective degradation characteristics were observed in artificial soil with the R-enantiomer preferentially degrading (p < 0.05); however, no significant enantioselective bioaccumulation was observed in the earthworms (p > 0.05). The acute toxicity of S-(+)-HEX was higher than that of R-(-)-HEX in earthworms, with 48-h LC50 values of 8.62 and 22.35 μg/cm2, respectively. At 25 mg/kg, enantiospecific induction of oxidative stress was observed in earthworms; moreover, S-(+)-HEX had a greater influence on the contents of malonaldehyde, cytochrome P450, and 8-hydroxy-2-deoxyguanosine than R-(-)-HEX. These results were consistent with those of the enrichment analysis of differentially expressed genes. The transcriptome sequencing results showed that S-(+)-HEX had a more significant influence on steroid biosynthesis, arachidonic acid metabolism, and cell cycle processes than R-(-)-HEX, leading to abnormal biological function activities. These results indicate that S-(+)-HEX may pose a higher risk to soil organisms than R-(-)-HEX. This study suggests that the environmental risk of chiral pesticides to nontarget organisms should be assessed at the enantiomeric level.
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Affiliation(s)
- Tong Liu
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences (CAAS), Qingdao, 266101, PR China
| | - Kuan Fang
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences (CAAS), Qingdao, 266101, PR China; Graduate School of Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China
| | - Yalei Liu
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences (CAAS), Qingdao, 266101, PR China; Graduate School of Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China
| | - Xiaolian Zhang
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences (CAAS), Qingdao, 266101, PR China; Graduate School of Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China
| | - Lingxi Han
- Graduate School of Chinese Academy of Agricultural Sciences, Beijing, 100081, PR China
| | - Xiuguo Wang
- Tobacco Research Institute of Chinese Academy of Agricultural Sciences (CAAS), Qingdao, 266101, PR China.
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12
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Sur S, Nakanishi H, Steele R, Zhang D, Varvares MA, Ray RB. Long non-coding RNA ELDR enhances oral cancer growth by promoting ILF3-cyclin E1 signaling. EMBO Rep 2020; 21:e51042. [PMID: 33043604 PMCID: PMC7726807 DOI: 10.15252/embr.202051042] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2020] [Revised: 09/16/2020] [Accepted: 09/18/2020] [Indexed: 12/22/2022] Open
Abstract
Oral squamous cell carcinoma (OSCC) is the sixth most common cancer with a 5-year overall survival rate of 50%. Thus, there is a critical need to understand the disease process, and to identify improved therapeutic strategies. Previously, we found the long non-coding RNA (lncRNA) EGFR long non-coding downstream RNA (ELDR) induced in a mouse tongue cancer model; however, its functional role in human oral cancer remained unknown. Here, we show that ELDR is highly expressed in OSCC patient samples and in cell lines. Overexpression of ELDR in normal non-tumorigenic oral keratinocytes induces cell proliferation, colony formation, and PCNA expression. We also show that ELDR depletion reduces OSCC cell proliferation and PCNA expression. Proteomics data identifies the RNA binding protein ILF3 as an interacting partner of ELDR. We further show that the ELDR-ILF3 axis regulates Cyclin E1 expression and phosphorylation of the retinoblastoma (RB) protein. Intratumoral injection of ELDR-specific siRNA reduces OSCC and PDX tumor growth in mice. These findings provide molecular insight into the role of ELDR in oral cancer and demonstrate that targeting ELDR has promising therapeutic potential.
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Affiliation(s)
- Subhayan Sur
- Department of PathologySaint Louis UniversitySaint LouisMOUSA
| | | | - Robert Steele
- Department of PathologySaint Louis UniversitySaint LouisMOUSA
| | - Dapeng Zhang
- Department of BiologySaint Louis UniversitySaint LouisMOUSA
| | - Mark A Varvares
- Saint Louis University Cancer CenterSaint LouisMOUSA
- Department of Otolaryngology, Head and Neck SurgeryMassachusetts Eye and EarHarvard Medical SchoolBostonMAUSA
| | - Ratna B Ray
- Department of PathologySaint Louis UniversitySaint LouisMOUSA
- Saint Louis University Cancer CenterSaint LouisMOUSA
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13
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Niaz K, Shah SZA, Khan F, Bule M. Ochratoxin A-induced genotoxic and epigenetic mechanisms lead to Alzheimer disease: its modulation with strategies. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2020; 27:44673-44700. [PMID: 32424756 DOI: 10.1007/s11356-020-08991-y] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Accepted: 04/22/2020] [Indexed: 06/11/2023]
Abstract
Ochratoxin A (OTA) is a naturally occurring mycotoxin mostly found in food items including grains and coffee beans. It induces DNA single-strand breaks and has been considered to be carcinogenic. It is recognized as a serious threat to reproductive health both in males and females. OTA is highly nephrotoxic and carcinogenic, and its potency changes evidently between species and sexes. There is a close association between OTA, mutagenicity, carcinogenicity, and genotoxicity, but the underlying mechanisms are not clear. Reports regarding genotoxic effects in relation to OTA which leads to the induction of DNA adduct formation, protein synthesis inhibition, perturbation of cellular energy production, initiation of oxidative stress, induction of apoptosis, influences on mitosis, induction of cell cycle arrest, and interference with cytokine pathways. All these mechanisms are associated with nephrotoxicity, hepatotoxicity, teratotoxicity, immunological toxicity, and neurotoxicity. OTA administration activates various mechanisms such as p38 MAPK, JNKs, and ERKs dysfunctions, BDNF disruption, TH overexpression, caspase-3 and 9 activation, and ERK-1/2 phosphorylation which ultimately lead to Alzheimer disease (AD) progression. The current review will focus on OTA in terms of recent discoveries in the field of molecular biology. The main aim is to investigate the underlying mechanisms of OTA in regard to genotoxicity and epigenetic modulations that lead to AD. Also, we will highlight the strategies for the purpose of attenuating the hazards posed by OTA exposure.
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Affiliation(s)
- Kamal Niaz
- Department of Pharmacology and Toxicology, Faculty of Bio-Sciences, Cholistan University of Veterinary and Animal Sciences, Bahawalpur, 63100, Pakistan.
| | - Syed Zahid Ali Shah
- Department of Pathology, Faculty of Veterinary Science, Cholistan University of Veterinary and Animal Sciences, Bahawalpur, 63100, Pakistan
| | - Fazlullah Khan
- The Institute of Pharmaceutical Sciences (TIPS), School of Pharmacy, International Campus, Tehran University of Medical Sciences (IC-TUMS), Tehran, 1417614411, Iran
- Department of Toxicology and Pharmacology, Faculty of Pharmacy, Tehran University of Medical Science, Tehran, 1417614411, Iran
| | - Mohammed Bule
- Department of Pharmacy, College of Medicine and Health Sciences, Ambo University, Ambo, Oromia, Ethiopia
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14
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Zhu L, Huang C, Yang X, Zhang B, He X, Xu W, Huang K. Proteomics reveals the alleviation of zinc towards aflatoxin B1-induced cytotoxicity in human hepatocyes (HepG2 cells). ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 198:110596. [PMID: 32353602 DOI: 10.1016/j.ecoenv.2020.110596] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2020] [Revised: 04/02/2020] [Accepted: 04/03/2020] [Indexed: 05/24/2023]
Abstract
Aflatoxin B1 (AFB1) is a known carcinogen found in contaminated food and designated by the World Health Organization as a class I carcinogenic substance. AFB1 presents with carcinogenicity, teratogenicity, and mutagenicity, and the liver is the human organ most susceptible to AFB1. Zinc (Zn), which is one of the essential nutrient elements that could protect the cells from biological toxins, heavy metals, hydrogen peroxide, metal chelators and radiation, is assessed in this study for its potential to alleviate AFB1-induced cytotoxicity. Samples were divided into three groups, namely CK, AFB1, and AFB1+Zn. Protein expressions were analyzed by two-way electrophoresis combined with flight mass spectrometry, with 41 differentially expressed proteins identified in the results, mainly related to oxidative stress, cell apoptosis, DNA damage, and energy metabolism. Zn was found to regulate the expression of peroxidases (peroxiredoxin-1, peroxiredoxin-5, peroxiredoxin-6) to relieve AFB1-induced oxidative stress. Moreover, Zn could decrease the expression of pro-apoptotic genes (cleaved-caspase-3, caspase-9, and Bax) and increase the expression of anti-apoptotic genes (Bcl-2 and Bcl-xl) to alleviate the cell apoptosis induced by AFB1. In addition, AFB1 reduced intracellular ATP levels, whereas Zn supplementation boosted ATP levels and maintained homeostasis and a steady state of cellular energy metabolism by modulating AMPK-ACC phosphorylation levels, while many zinc finger proteins changed after AFB1 treatment. These results, therefore, indicate that Zn could alleviate AFB1-induced cytotoxicity by changing the expressions of zinc finger proteins in liver hepatocellular carcinoma (HepG2 cells).
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Affiliation(s)
- Liye Zhu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China; Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety), Ministry of Agriculture, Beijing, 100083, China
| | - Chuchu Huang
- Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety), Ministry of Agriculture, Beijing, 100083, China
| | - Xuan Yang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China; Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety), Ministry of Agriculture, Beijing, 100083, China
| | - Boyang Zhang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China; Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety), Ministry of Agriculture, Beijing, 100083, China
| | - Xiaoyun He
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China; Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety), Ministry of Agriculture, Beijing, 100083, China
| | - Wentao Xu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, 100083, China; Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety), Ministry of Agriculture, Beijing, 100083, China
| | - Kunlun Huang
- Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety), Ministry of Agriculture, Beijing, 100083, China; Key Laboratory of Precision Nutrition and Food Quality, Key Laboratory of Functional Dairy, Ministry of Education, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing 100083, China.
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15
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Luteolin alleviates ochratoxin A induced oxidative stress by regulating Nrf2 and HIF-1α pathways in NRK-52E rat kidney cells. Food Chem Toxicol 2020; 141:111436. [DOI: 10.1016/j.fct.2020.111436] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 04/23/2020] [Accepted: 05/12/2020] [Indexed: 02/06/2023]
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16
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Safety evaluation of Ochratoxin A and Citrinin after 28 days repeated dose oral exposure to Wistar rats. Regul Toxicol Pharmacol 2020; 115:104700. [PMID: 32525063 DOI: 10.1016/j.yrtph.2020.104700] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2019] [Revised: 04/25/2020] [Accepted: 06/02/2020] [Indexed: 12/19/2022]
Abstract
Mycotoxins, ochratoxin A (OTA), and citrinin (CTN) are toxic metabolites of filamentous fungi. The most common fungal species that produce OTA and CTN belong to genera Aspergillus, Penicillium, Fusarium, and Monascus, and these fungal species are found to be contaminant a wide range of grains, food, and food product. The aim of our study was to evaluate the sub-acute repeated dose oral toxicity of OTA and CTN in experimental rodents by following OECD test guidelines for testing chemicals no. 407 with minor modifications. Twenty-five rats of each sex were divided equally into five groups; vehicle control, OTA 25 μg/kg b. wt., OTA 100 μg/kg b. wt., CTN 25 μg/kg b.wt. and CTN 100 μg/kg b. wt. The results of this study showed no abnormal clinical signs during 28 days of the experimental period. We did not found any significant changes in body weight gain, food consumption pattern, organ weight, hematology except few parameters, and biochemical values in any of the treatment and control groups. However, histopathological observations revealed severe nephrotoxicity and mild follicular depletion in the spleen of 100 μg/kg b. wt. treated groups of both OTA and CTN mycotoxins. The findings of our study are of its first kind that reports the systemic toxicity of OTA and CTN oral exposure to laboratory rodents.
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Aşcı Çelik D, Gurbuz N, Toğay VA, Özçelik N. Ochratoxin A causes cell cycle arrest in G1 and G1/S phases through p53 in HK-2 cells. Toxicon 2020; 180:11-17. [DOI: 10.1016/j.toxicon.2020.03.012] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2020] [Revised: 02/18/2020] [Accepted: 03/31/2020] [Indexed: 12/20/2022]
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18
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Zhang TY, Kong L, Hao JX, Wang H, Yan ZH, Sun XF, Shen W. Effects of Ochratoxin A exposure on DNA damage in porcine granulosa cells in vitro. Toxicol Lett 2020; 330:167-175. [PMID: 32454083 DOI: 10.1016/j.toxlet.2020.05.011] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 05/09/2020] [Accepted: 05/11/2020] [Indexed: 01/19/2023]
Abstract
Ochratoxin A (OTA), a feed mycotoxin, tends to impair the reproductive performance of animals. Our previous studies have demonstrated that OTA exposure inhibits porcine ovarian granulosa cell (GC) proliferation and induces their apoptosis, but the underlying toxic mechanism is still uncertain. In this study, we explored the OTA exposure on porcine GCs in vitro and found that OTA exposure inhibited the proliferation of porcine GCs and arrested cell cycle of GCs in the G2/M phase. The results based on RNA-Seq revealed that 20 μM and 40 μM OTA exposure increase DNA damage of porcine GCs in vitro. The differentially expressed genes (DEGs) of 40 μM OTA exposure were enriched in the pathways of mismatch repair, nucleotide excision repair and homologous recombination in DNA replication compared with control group and 20 μM OTA exposure group. Meanwhile, OTA exposure increased the expression levels of DNA double-strand breaks (DSBs) gene γ-H2AX, and DNA repair related genes, such as BRCA1, XRCC1, PARP1, and RAD51. Above all, our research revealed that OTA might exert deleterious effects on porcine ovarian GCs, influencing DNA repair-related biological processes and causing DNA damage response.
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Affiliation(s)
- Tian-Yu Zhang
- College of Life Sciences, Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong, Qingdao Agricultural University, Qingdao 266109, China; School of Public Health, Qingdao University, Qingdao 266034, China
| | - Li Kong
- College of Life Sciences, Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong, Qingdao Agricultural University, Qingdao 266109, China
| | - Jia-Xing Hao
- Center for Reproductive Medicine, Qingdao Women's and Children's Hospital, Qingdao University, Qingdao 266034, China
| | - Han Wang
- College of Life Sciences, Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong, Qingdao Agricultural University, Qingdao 266109, China
| | - Zi-Hui Yan
- College of Life Sciences, Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong, Qingdao Agricultural University, Qingdao 266109, China
| | - Xiao-Feng Sun
- College of Life Sciences, Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong, Qingdao Agricultural University, Qingdao 266109, China
| | - Wei Shen
- College of Life Sciences, Key Laboratory of Animal Reproduction and Germplasm Enhancement in Universities of Shandong, Qingdao Agricultural University, Qingdao 266109, China.
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Schrenk D, 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, Wallace H, Alexander J, Dall'Asta C, Mally A, Metzler M, Binaglia M, Horváth Z, Steinkellner H, Bignami M. Risk assessment of ochratoxin A in food. EFSA J 2020; 18:e06113. [PMID: 37649524 PMCID: PMC10464718 DOI: 10.2903/j.efsa.2020.6113] [Citation(s) in RCA: 89] [Impact Index Per Article: 22.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
The European Commission asked EFSA to update their 2006 opinion on ochratoxin A (OTA) in food. OTA is produced by fungi of the genus Aspergillus and Penicillium and found as a contaminant in various foods. OTA causes kidney toxicity in different animal species and kidney tumours in rodents. OTA is genotoxic both in vitro and in vivo; however, the mechanisms of genotoxicity are unclear. Direct and indirect genotoxic and non-genotoxic modes of action might each contribute to tumour formation. Since recent studies have raised uncertainty regarding the mode of action for kidney carcinogenicity, it is inappropriate to establish a health-based guidance value (HBGV) and a margin of exposure (MOE) approach was applied. For the characterisation of non-neoplastic effects, a BMDL 10 of 4.73 μg/kg body weight (bw) per day was calculated from kidney lesions observed in pigs. For characterisation of neoplastic effects, a BMDL 10 of 14.5 μg/kg bw per day was calculated from kidney tumours seen in rats. The estimation of chronic dietary exposure resulted in mean and 95th percentile levels ranging from 0.6 to 17.8 and from 2.4 to 51.7 ng/kg bw per day, respectively. Median OTA exposures in breastfed infants ranged from 1.7 to 2.6 ng/kg bw per day, 95th percentile exposures from 5.6 to 8.5 ng/kg bw per day in average/high breast milk consuming infants, respectively. Comparison of exposures with the BMDL 10 based on the non-neoplastic endpoint resulted in MOEs of more than 200 in most consumer groups, indicating a low health concern with the exception of MOEs for high consumers in the younger age groups, indicating a possible health concern. When compared with the BMDL 10 based on the neoplastic endpoint, MOEs were lower than 10,000 for almost all exposure scenarios, including breastfed infants. This would indicate a possible health concern if genotoxicity is direct. Uncertainty in this assessment is high and risk may be overestimated.
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20
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Weighted Correlation Network Analysis Reveals CDK2 as a Regulator of a Ubiquitous Environmental Toxin-Induced Cell-Cycle Arrest. Cells 2020; 9:cells9010143. [PMID: 31936152 PMCID: PMC7017252 DOI: 10.3390/cells9010143] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2019] [Revised: 12/20/2019] [Accepted: 12/23/2019] [Indexed: 12/22/2022] Open
Abstract
Environmental food contaminants constitute a threat to human health. For instance, the globally spread mycotoxin Ochratoxin A (OTA) contributes to chronic kidney damage by affecting proximal tubule cells via unknown mechanisms. We applied a top-down approach to identify relevant toxicological mechanisms of OTA using RNA-sequencing followed by in-depth bioinformatics analysis and experimental validation. Differential expression analyses revealed that OTA led to the regulation of gene expression in kidney human cell lines, including for genes enriched in cell cycle-related pathways, and OTA-induced gap 1 and 2 (G1 and G2) cell-cycle arrests were observed. Weighted correlation network analysis highlighted cyclin dependent kinase 2 (CDK2) as a putative key regulator of this effect. CDK2 was downregulated by OTA exposure, and its overexpression partially blocked the OTA-induced G1 but not G2 cell-cycle arrest. We, therefore, propose CDK2 as one of the key regulators of the G1 cell-cycle arrest induced by low nanomolar concentrations of OTA.
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Amelioration of ochratoxin-A induced cytotoxicity by prophylactic treatment of N-Acetyl-L-Tryptophan in human embryonic kidney cells. Toxicology 2019; 429:152324. [PMID: 31678613 DOI: 10.1016/j.tox.2019.152324] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2019] [Revised: 09/19/2019] [Accepted: 10/23/2019] [Indexed: 01/31/2023]
Abstract
Ochratoxin A (OTA) is known to induce nephro-toxicity via induction of cellular redox homeostasis perturbation, mitochondrial hyperpolarisation and depolarization, protein synthesis inhibition leading to apoptosis. In the present study, protective efficacy of N-Acetyl-L-Tryptophan (NAT) against OTA induced toxicity was evaluated using Human Embryonic Kidney (HEK-293) cells. Cells were treated with NAT (0-200 μg/ml) before OTA treatment (0-20 μg/ml) and protective efficacy of NAT was evaluated using MTT and SRB assay. OTA-induced intracellular ROS generation and its inhibition by NAT (2.5 μg/ml) pre-treatment was evaluated using 2',7'-dichlorodihydrofluorescein diacetate (H2DCFDA) probe. Effects of NAT pre-treatment on OTA treated cells were also evaluated in terms of cell cycle perturbations and mitochondrial membrane potential disturbance using flowcytometry. Results of the study demonstrated significant (∼89 % cell growth in comparison to 50% in OTA alone group; P < 0.05) protection by NAT to the HEK-293 cells against OTA mediated cell death in terms of cell viability. Further, significant reduction in ROS levels and mitochondrial membrane potential disturbance was also observed in NAT pre-treated plus OTA cells as compared to only OTA treated cells. Significant (p < 0.05) arrest in G0 and S phase of cell cycle was observed in OTA treated cells that was found to be inhibited by NAT pre-treatment to OTA treated cells. Also, molecular docking analysis demonstrated higher probability of NAT to bind with OTA binding pocket on phenylalanyl t-RNA synthetase, resulting in inhibition of OTA incorporation in the newly synthesized peptides and thus may ameliorate OTA induced protein synthesis inhibition. Conclusively, present study suggested that NAT offers protection against OTA toxicity in HEK-293 cells by counterbalancing oxidative stress, cell cycle regulation, mitochondrial membrane potential stabilization, protein synthesis inhibition and cell death retardation.
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22
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Akpinar HA, Kahraman H, Yaman I. Ochratoxin A Sequentially Activates Autophagy and the Ubiquitin-Proteasome System. Toxins (Basel) 2019; 11:E615. [PMID: 31653047 PMCID: PMC6891609 DOI: 10.3390/toxins11110615] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Revised: 10/12/2019] [Accepted: 10/23/2019] [Indexed: 12/21/2022] Open
Abstract
Ochratoxin A (OTA) is a carcinogenic mycotoxin, which is produced by Aspergillus and Penicillium genera of fungi and commonly contaminates food and feed. We and others have previously shown that OTA causes sustained activation of PI3K/AKT and MAPK/ERK1-2 signaling pathways in different cell types and animal models. Given the close relationship between cellular signaling activity and protein stability, we were curious whether increased PI3K/AKT and MAPK/ERK1-2 signaling may be the result of OTA-stimulated alterations in proteolytic activity. We show that both of the major proteolytic systems, autophagy, and the ubiquitin-proteasome system (UPS), are activated upon OTA exposure in human kidney proximal tubule HK-2 and mouse embryonic fibroblast (MEF) cells. OTA stimulates transient autophagic activity at early time points of treatment but autophagic activity subsides after 6 h even in the sustained presence of OTA. Interestingly, OTA exposure also results in increased cell death in wild-type MEF cells but not in autophagy-halted Atg5-deficient cells, suggesting that autophagy exerts a pro-death effect on OTA-induced cytotoxicity. In addition, prolonged OTA exposure decreased ubiquitinated protein levels by increasing proteasomal activity. Using purified and cellular proteasomes, we observed enhanced chymotrypsin-, caspase-, and trypsin-like activities of the 26S but not the 20S proteasome in the presence of OTA. However, in the cellular context, increased proteasomal activity depended on prior induction of autophagy. Our results suggest that autophagy and subsequent UPS activation are responsible for sustained activation of PI3K/AKT and MAPK/ERK1-2 pathways through regulating the levels of critical phosphatases VHR/DUSP3, DUSP4, and PHLPP, which are known to be involved in OTA toxicity and carcinogenicity.
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Affiliation(s)
- Hafize Aysin Akpinar
- Molecular Toxicology and Cancer Research Laboratory, Department of Molecular Biology and Genetics, Bogazici University, Bebek-Istanbul 34342, Turkey.
| | - Hilal Kahraman
- Molecular Toxicology and Cancer Research Laboratory, Department of Molecular Biology and Genetics, Bogazici University, Bebek-Istanbul 34342, Turkey.
| | - Ibrahim Yaman
- Molecular Toxicology and Cancer Research Laboratory, Department of Molecular Biology and Genetics, Bogazici University, Bebek-Istanbul 34342, Turkey.
- Center for Life Sciences and Technologies, Bogazici University, Bebek-Istanbul 34342, Turkey.
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23
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Zhang B, Zhu L, Dai Y, Li H, Huang K, Luo Y, Xu W. An in vitro attempt at precision toxicology reveals the involvement of DNA methylation alteration in ochratoxin A-induced G0/G1 phase arrest. Epigenetics 2019; 15:199-214. [PMID: 31314649 DOI: 10.1080/15592294.2019.1644878] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022] Open
Abstract
Precision toxicology evaluates the toxicity of certain substances by isolating a small group of cells with a typical phenotype of interest followed by a single cell sequencing-based analysis. In this in vitro attempt, ochratoxin A (OTA), a typical mycotoxin and food contaminant, is found to induce G0/G1 phase cell cycle arrest in human renal proximal tubular HKC cells at a concentration of 20 μM after a 24h-treatment. A small number of G0/G1 phase HKC cells are evaluated in both the presence and absence of OTA. These cells are sorted with a flow cytometer and subjected to mRNA and DNA methylation sequencing using Smart-Seq2 and single-cell reduced-representation bisulfite sequencing (scRRBS) technology, respectively. Integrated analysis of the transcriptome and methylome profiles reveals that OTA causes abnormal expression of the essential genes that regulate G1/S phase transition, act as signal transductors in G1 DNA damage checkpoints, and associate with the anaphase-promoting complex/cyclosome. The alteration of their DNA methylation status is a significant underlying epigenetic mechanism. Furthermore, Notch signaling and Ras/MAPK/CREB pathways are found to be suppressed by OTA. This attempt at precision toxicology paves the way for a deeper understanding of OTA toxicity and provides an innovative strategy to researchers in the toxicology and pharmacology field.
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Affiliation(s)
- Boyang Zhang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China.,Department of Pharmacology, Perelman School of Medicine, University of Pennsylvania, Philadelphia, PA, USA
| | - Liye Zhu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Yaqi Dai
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Hongyu Li
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Kunlun Huang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China.,Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety), Ministry of Agriculture, Beijing, China
| | - Yunbo Luo
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China.,Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety), Ministry of Agriculture, Beijing, China
| | - Wentao Xu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China.,Key Laboratory of Safety Assessment of Genetically Modified Organism (Food Safety), Ministry of Agriculture, Beijing, China
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24
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Liu JJ, Ho JY, Lee HW, Baik MW, Kim O, Choi YJ, Hur SY. Inhibition of Phosphatidylinositol 3-kinase (PI3K) Signaling Synergistically Potentiates Antitumor Efficacy of Paclitaxel and Overcomes Paclitaxel-Mediated Resistance in Cervical Cancer. Int J Mol Sci 2019; 20:E3383. [PMID: 31295843 PMCID: PMC6679163 DOI: 10.3390/ijms20143383] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2019] [Revised: 06/30/2019] [Accepted: 07/08/2019] [Indexed: 12/19/2022] Open
Abstract
Acquired paclitaxel (PTX) resistance limits its effectiveness and results in advanced cancer progression. This review investigated whether the inhibition of phosphatidylinositol 3-kinase (PI3K) signaling overcomes paclitaxel resistance in cervical cancer. It was established paclitaxel-resistant cell lines (PTX-R ME180/PTX-R HeLa) and determined the combination index for paclitaxel and PI3K inhibitors (BYL-719/ LY294002) by tetrazolium dye assay. Flow cytometry was used to detect the cell cycle and apoptosis. Migration and invasion were explored by wound healing and transwell assays. Genes related to multiple pathways were assessed by a western blot. It was found that the PI3K pathway was significantly activated in paclitaxel-resistant HeLa and ME180 cells compared to parental cells. PTX + PI3K inhibitor combined therapy showed a synergistic effect by strengthening paclitaxel-induced S and G2M arrest in PTX-R cell sublines by the inactivation of cyclin A1, cyclin B1, cyclin E, and Cdc2 expression. Moreover, combination therapy significantly enhanced drug sensitivity and apoptosis through the activation of Bax, and cleavage of poly-(ADP-ribose) polymerase compared with paclitaxel alone. In addition, PI3K inhibition also suppressed tumor migration and invasion by targeting β-catenin and matrix metalloproteinase-2/9. The authors suggest that the combination of a PI3K inhibitor with paclitaxel may enhance antitumor activity through a cascade of PI3K signaling events.
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Affiliation(s)
- Jing Jing Liu
- Department of Gynecology and Obstetrics, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul 06591, Korea
- Cancer Research Institute, Department of Medical Life Science, and Cancer Evolution Research Center, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea
| | - Jung Yoon Ho
- Department of Gynecology and Obstetrics, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul 06591, Korea
- Cancer Research Institute, Department of Medical Life Science, and Cancer Evolution Research Center, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea
| | - Hye Won Lee
- Department of Health Sciences and Technology, SAIHST, Sungkyunkwan University, Seoul 06591, Korea
| | - Min Wha Baik
- Department of Gynecology and Obstetrics, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul 06591, Korea
| | - Oyoung Kim
- Department of Gynecology and Obstetrics, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul 06591, Korea
| | - Youn Jin Choi
- Department of Gynecology and Obstetrics, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul 06591, Korea.
- Cancer Research Institute, Department of Medical Life Science, and Cancer Evolution Research Center, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea.
| | - Soo Young Hur
- Department of Gynecology and Obstetrics, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul 06591, Korea.
- Cancer Research Institute, Department of Medical Life Science, and Cancer Evolution Research Center, College of Medicine, The Catholic University of Korea, Seoul 06591, Korea.
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25
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Ginsenoside Rk1 induces cell death through ROS-mediated PTEN/PI3K/Akt/mTOR signaling pathway in MCF-7 cells. J Funct Foods 2019. [DOI: 10.1016/j.jff.2019.04.019] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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26
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Zhang W, Wang R, Giesy JP, Li Y, Wang P. Tris (1,3-dichloro-2-propyl) phosphate treatment induces DNA damage, cell cycle arrest and apoptosis in murine RAW264.7 macrophages. J Toxicol Sci 2019; 44:134-144. [PMID: 30842366 DOI: 10.2131/jts.44.134] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Tris (1,3-dichloro-2-propyl) phosphate (TDCPP) is the most widely used organophosphorus flame retardant, which is now used instead of polybrominated diphenyl ethers (PBDEs). TDCPP has frequently been detected in inorganic environmental matrices, such as soil, water and air as well as biota. In vitro effects of TDCPP on cells had not been previously elucidated. Therefore, in the present study, cytotoxicity, DNA damage, cell cycle distribution, apoptosis caused by TDCPP was studied in RAW264.7 macrophage cells. TDCPP reduced viability of RAW264.7 cells in a concentration-dependent manner and caused damage to DNA that was detected by use of the comet assay and caused up-regulation of the level of γ-H2AX. TDCPP increased the intracellular reactive oxygen species (ROS) level in RAW264.7 cells up to 1.44-fold compared to the control group at 12 hr. Percentages of cells in G1 and G2 phases of the cell cycle were dose-dependently greater in cells exposed to TDCPP. TDCPP significantly down-regulated expression of CDK-4, Cyclin D1, Cyclin B1, CDC-2, which are regulators of G1 and G2 phases of the cell cycle. These results demonstrated that TDCPP is cytotoxic and damages DNA in RAW264.7 cells, which resulted in arrest of the cell cycle at G1 and G2 phases and resulted in apoptosis, suggest the necessity to evaluate the effects of TDCPP on the immune system at the cellular level.
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Affiliation(s)
- Wei Zhang
- Institute of Quality Standard and Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, China
| | - Ruiguo Wang
- Institute of Quality Standard and Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, China
| | - John P Giesy
- Department of Veterinary Biomedical Sciences and Toxicology Centre, University of Saskatchewan, Canada.,Department of Zoology and Center for Integrative Toxicology, Michigan State University, United States.,School of Biological Sciences, University of Hong Kong, China.,State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, China
| | - Yang Li
- Institute of Quality Standard and Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, China
| | - Peilong Wang
- Institute of Quality Standard and Testing Technology for Agro-Products, Chinese Academy of Agricultural Sciences, China
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27
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Peng M, Liu J, Liang Z. Probiotic Bacillus subtilis CW14 reduces disruption of the epithelial barrier and toxicity of ochratoxin A to Caco-2 cells. Food Chem Toxicol 2019; 126:25-33. [PMID: 30763683 DOI: 10.1016/j.fct.2019.02.009] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Revised: 01/21/2019] [Accepted: 02/04/2019] [Indexed: 12/13/2022]
Abstract
The multiple toxic effects of ochratoxin A (OTA) are a threat for human and animal. This study aimed to examine whether B. subtilis CW14 protected against OTA-induced barrier disruption and cell damage to Caco-2 cells. The results showed that Caco-2 cells treated with OTA led to microvilli disruption, tight junction protein (ZO-1 and claudin-1) damage, and inhibition of cell proliferation by arresting the cell cycle in the G2/M phase that promoted apoptosis. The treatment of B. subtilis CW14 mitigated the tight junction injury by improving ZO-1 protein expression, and it reduced apoptosis that was induced by OTA. Furthermore, transcriptome analysis indicated that OTA down-regulated genes that involved in the tight junction, cell cycle, and apoptosis-related signaling pathways. B. subtilis CW14 may have protected the ZO-1 protein by activating the toll-like receptor signaling pathway, and it reduced OTA damage by down-regulating the death receptor genes and up-regulating the DNA repair genes. These findings demonstrated the importance of B. subtilis CW14 in the regulation of tight junction proteins and in reducing death of intestinal epithelial cells. Thus, B. subtilis CW14 is a potential candidate as a food additive to protect against intestinal damage.
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Affiliation(s)
- Mengxue Peng
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Jiawei Liu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Zhihong Liang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China; The Supervision, Inspection and Testing Center of Genetically Modified Organisms, Ministry of Agriculture, Beijing, China; Beijing Laboratory for Food Quality and Safety, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China.
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28
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Gabelova A, Kozics K, Kapka-Skrzypczak L, Kruszewski M, Sramkova M. Nephrotoxicity: Topical issue. Mutat Res 2018; 845:402988. [PMID: 31561894 DOI: 10.1016/j.mrgentox.2018.11.012] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2018] [Revised: 11/27/2018] [Accepted: 11/29/2018] [Indexed: 12/12/2022]
Abstract
Drug-induced kidney injury is one of the most significant adverse events and dose limiting factor in chemotherapy as well a major cause of prospective drug attrition during pharmaceutical development. Moreover, kidney injury can also occur as a consequence of exposures to environmental xenobiotics such as heavy metals, fungal toxins and nanomaterials. The lack of adequate in vitro human kidney models that mimic more realistically the in vivo conditions and the absence of suitable and robust, cost-effective and predictive cell-based in vitro assays contribute to an underestimation of the kidney toxic potential of new drugs and xenobiotics. Therefore, a rapid screening system capable to detect potential nephrotoxicity at early stages of drug discovery is an urgent need. Here we provide an overview of human cell lines currently used as a surrogate in vitro kidney models in nephrotoxicity studies, including their advantages and limitations. In addition, the capacity of the single cell gel electrophoresis (SCGE)/comet assay as a potential tool in kidney toxicants screening is discussed. Despite a limited number of studies using the comet assay to evaluate the drug-induced kidney damage potential, a considerable variability in SCGE methodology (e.g. lysis, unwinding, and electrophoresis conditions) has been observed. Before the comet assay can be included in nephrotoxicity testing, a basic guideline has to be developed. To test its feasibility, additional in vitro experiments including inter-laboratory validation studies based on this guideline have to be performed.
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Affiliation(s)
- Alena Gabelova
- Cancer Research Institute, Biomedical Research Center SAS, Dubravska cesta 9, 845 05 Bratislava, Slovakia.
| | - Katarina Kozics
- Cancer Research Institute, Biomedical Research Center SAS, Dubravska cesta 9, 845 05 Bratislava, Slovakia
| | - Lucyna Kapka-Skrzypczak
- Department of Molecular Biology and Translational Research, Institute of Rural Health, Jaczewskiego 2, 20-090 Lublin, Poland; Department of Medical Biology and Translational Research, Faculty of Medicine, University of Information Technology and Management, Sucharskiego 2, 35-225, Rzeszów, Poland
| | - Marcin Kruszewski
- Department of Molecular Biology and Translational Research, Institute of Rural Health, Jaczewskiego 2, 20-090 Lublin, Poland; Department of Medical Biology and Translational Research, Faculty of Medicine, University of Information Technology and Management, Sucharskiego 2, 35-225, Rzeszów, Poland; Centre for Radiobiology and Biological Dosimetry, Institute of Nuclear Chemistry and Technology, Dorodna 16, 03-195, Warsaw, Poland
| | - Monika Sramkova
- Cancer Research Institute, Biomedical Research Center SAS, Dubravska cesta 9, 845 05 Bratislava, Slovakia
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Molecular signatures of cytotoxic effects in human embryonic kidney 293 cells treated with single and mixture of ochratoxin A and citrinin. Food Chem Toxicol 2018; 123:374-384. [PMID: 30428381 DOI: 10.1016/j.fct.2018.11.015] [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: 05/29/2018] [Revised: 10/26/2018] [Accepted: 11/07/2018] [Indexed: 01/04/2023]
Abstract
Ochratoxin A (OTA) and citrinin (CTN) are important mycotoxins, which often coexist in food and feed stuff. In this study, individual and combinative cytotoxicity of OTA and CTN were tested in human embryonic kidney (HEK) 293 cells via MTT assay, and synergistic cytotoxic effects were found following co-treatment with OTA and CTN, manifested by significant accumulation of HEK293 cells in S and G2/M stages. Transcriptomic and sRNA sequencing were performed to explore molecular signatures mediating individual or combinative cytotoxicity. A total of 378 miRNAs were identified, among which 66 miRNAs targeting thousands of genes were differentially expressed in response to different treatments, and 120 differentially expressed genes (DEGs) were regulated by either individual or combinative treatments. Correlations between two representative miRNAs (hsa-miR-1-3p and hsa-miR-122-5p), and their target genes, programmed cell death 10 (PDCD10) and cyclin G1 (CCNG1), associated with apoptotic signaling and cell cycle were analyzed by luciferase assay system. Further, their expression patterns were validated by quantitative real-time PCR and western blot analysis, suggesting that both miRNA-target interactions might account for the mycotoxin-induced cell death. Taken together, these findings provide molecular evidences for synergistic cytotoxic effects of exposure to single and mixture of OTA and CTN in HEK293 cells.
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30
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Mitigation of cell apoptosis induced by ochratoxin A (OTA) is possibly through organic cation transport 2 (OCT2) knockout. Food Chem Toxicol 2018; 121:15-23. [PMID: 30120945 DOI: 10.1016/j.fct.2018.08.026] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2018] [Revised: 08/12/2018] [Accepted: 08/14/2018] [Indexed: 01/06/2023]
Abstract
Ochratoxin A (OTA) is a secondary metabolite of fungi such as Aspergillus ochraceus, A. niger and A. carbonarius, Penicillium verrucosum, and various other Penicillium, Petromyces, and Neopetromyces species. Various foods can be contaminated with OTA, potentially causing several toxic effects such as nephrotoxicity, hepatotoxicity and neurotoxicity. Typically, OTA is excreted by organic anion transporters (OATs). There is no research indicating organic cation transporters (OCTs) are involved in OTA nephrotoxicity. In our study, NRK-52E cells and rats were treated with OTA. OTA changed the expression of OCT1, OCT2 and OCT3 in NRK-52E cells and rat kidneys. TEA alleviated OTA-induced cell death, apoptosis, and DNA damage, and increased ROS. The OCT2 knockout cell line was constructed by the CRISPR/Cas 9 system. OCT2 knockout did not change the gene expression of OCT1, OAT1 and OAT3. OCT2 knockout alleviated the increase of Caspase 3 and CDK1 induced by OTA, leading to a reduction of apoptosis. In addition, OCT2 overexpression increased cell toxicity and expression of Caspase 3. In short, our findings indicate that OCT2 knockout possibly mitigate OTA-induced apoptosis by preventing the increase of Caspase 3 and CDK1.
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Abstract
Ajwa dates (Phoenix dactylifera), cultivated particularly in Al-Madina Al-Monawarh in Saudi Arabia, and considered as a rich source of natural antioxidants such as anthocyanins, carotenoids and phenolics. It is believed that Ajwa dates have a wide range of protective effects. For this reason, this work aimed to investigate the ameliorative effect of Ajwa dates aqueous extract against ochratoxin A (OTA)-induced testicular lesions in rats. Rats were divided into four groups and treated for 28 days. Group I served as normal control, group II (OTA exposed) treated orally with 289 μg/kg/day. Group III (Ajwa dates aqueous extract) treated orally with 1 g/kg/day. The last group served as the protective group (pretreated with Ajwa dates extract, then OTA). Histological studies revealed that OTA induced lesions in the testicular structure included proliferation of sertoli cells, impairment of some spermatogenesis stages and accumulation of premeiotic germinal cells. However, pretreatment with Ajwa dates extract prevented all the testicular damage and improved spermatogenesis, as well as remarkably enhanced the testicular structure. In conclusion, Ajwa dates aqueous extract has a powerful protective effect and ameliorative influence against OTA- induced testicular damage and may be used to treat sexual impairment and male infertility.
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Affiliation(s)
- Suzan Bakr Abdu
- Department of Biological Sciences, Faculty of Science, King Abdulaziz University, Jeddah, Saudi Arabia
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32
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Zinc enhances the cellular energy supply to improve cell motility and restore impaired energetic metabolism in a toxic environment induced by OTA. Sci Rep 2017; 7:14669. [PMID: 29116164 PMCID: PMC5676743 DOI: 10.1038/s41598-017-14868-x] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Accepted: 10/12/2017] [Indexed: 02/08/2023] Open
Abstract
Exogenous nutrient elements modulate the energetic metabolism responses that are prerequisites for cellular homeostasis and metabolic physiology. Although zinc is important in oxidative stress and cytoprotection processes, its role in the regulation of energetic metabolism remains largely unknown. In this study, we found that zinc stimulated aspect in cell motility and was essential in restoring the Ochratoxin A (OTA)-induced energetic metabolism damage in HEK293 cells. Moreover, using zinc supplementation and zinc deficiency models, we observed that zinc is conducive to mitochondrial pyruvate transport, oxidative phosphorylation, carbohydrate metabolism, lipid metabolism and ultimate energy metabolism in both normal and toxic-induced oxidative stress conditions in vitro, and it plays an important role in restoring impaired energetic metabolism. This zinc-mediated energetic metabolism regulation could also be helpful for DNA maintenance, cytoprotection and hereditary cancer traceability. Therefore, zinc can widely adjust energetic metabolism and is essential in restoring the impaired energetic metabolism of cellular physiology.
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Limbeck E, Vanselow JT, Hofmann J, Schlosser A, Mally A. Linking site-specific loss of histone acetylation to repression of gene expression by the mycotoxin ochratoxin A. Arch Toxicol 2017; 92:995-1014. [PMID: 29098329 DOI: 10.1007/s00204-017-2107-6] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2017] [Accepted: 10/26/2017] [Indexed: 11/30/2022]
Abstract
Ochratoxin A (OTA) is a potent renal carcinogen but its mechanism has not been fully resolved. In vitro and in vivo gene expression studies consistently revealed down-regulation of gene expression as the predominant transcriptional response to OTA. Based on the importance of specific histone acetylation marks in regulating gene transcription and our recent finding that OTA inhibits histone acetyltransferases (HATs), leading to loss of acetylation of histones and non-histone proteins, we hypothesized that OTA-mediated repression of gene expression may be causally linked to HAT inhibition and loss of histone acetylation. In this study, we used a novel mass spectrometry approach employing chemical 13C-acetylation of unmodified lysine residues for quantification of post-translational acetylation sites to identify site-specific alterations in histone acetylation in human kidney epithelial cells (HK-2) exposed to OTA. These results showed OTA-mediated hypoacetylation at almost all lysine residues of core histones, including loss of acetylation at H3K9 and H3K14, which are hallmarks of gene activation. ChIP-qPCR used to establish a possible link between H3K9 or H3K14 hypoacetylation and OTA-mediated down-regulation of selected genes (AMIGO2, CLASP2, CTNND1) confirmed OTA-mediated H3K9 hypoacetylation at promoter regions of these genes. Integrated analysis of OTA-mediated genome-wide changes in H3K9 acetylation identified by ChIP-Seq with published gene expression data further demonstrated that among OTA-responsive genes almost 80% of hypoacetylated genes were down-regulated, thus confirming an association between H3K9 acetylation status and gene expression of these genes. However, only 7% of OTA repressed genes showed loss of H3K9 acetylation within promoter regions. Interestingly, however, GO analysis and functional enrichment of down-regulated genes showing loss of H3K9 acetylation at their respective promoter regions revealed enrichment of genes involved in the regulation of transcription, including a number of transcription factors that are predicted to directly or indirectly regulate the expression of 98% of OTA repressed genes. Thus, it is possible that histone acetylation changes in a fairly small set of genes but with key function in transcriptional regulation may trigger a cascade of events that may lead to overall repression of gene expression. Taken together, our data provide evidence for a mechanistic link between loss of H3K9 acetylation as a consequence of OTA-mediated inhibition of HATs and repression of gene expression by OTA, thereby affecting cellular processes critical to tumorigenesis.
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Affiliation(s)
- Elisabeth Limbeck
- Department of Toxicology, University of Würzburg, Versbacher Str. 9, 97078, Würzburg, Germany
| | - Jens T Vanselow
- Rudolf Virchow Center for Experimental Biomedicine, University of Würzburg, 97078, Würzburg, Germany
| | - Julian Hofmann
- Department of Toxicology, University of Würzburg, Versbacher Str. 9, 97078, Würzburg, Germany
| | - Andreas Schlosser
- Rudolf Virchow Center for Experimental Biomedicine, University of Würzburg, 97078, Würzburg, Germany
| | - Angela Mally
- Department of Toxicology, University of Würzburg, Versbacher Str. 9, 97078, Würzburg, Germany.
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Gan F, Zhou Y, Hou L, Qian G, Chen X, Huang K. Ochratoxin A induces nephrotoxicity and immunotoxicity through different MAPK signaling pathways in PK15 cells and porcine primary splenocytes. CHEMOSPHERE 2017; 182:630-637. [PMID: 28527416 DOI: 10.1016/j.chemosphere.2017.05.030] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2017] [Revised: 04/26/2017] [Accepted: 05/04/2017] [Indexed: 06/07/2023]
Abstract
Ochratoxin A (OTA) is reported to be a potent nephrotoxin and immunotoxin in animals and humans. However, the mechanisms underlying OTA toxicity have not been clearly determined until now. Toxicity of OTA and its mechanism was investigated in PK15 cells and in porcine primary splenocytes. The results showed that OTA at 2.0-8.0 μg/mL for 24 h induced cytotoxicity and apoptosis in a dose-dependent manner in PK 15 cells. OTA at 0.5-4.0 μg/mL for 24 h induced cytotoxicity and apoptosis in a dose-dependent manner in porcine primary splenocytes. In addition, OTA induced p38 and ERK1/2 phosphorylation both in PK15 cells and porcine primary splenocytes. Knock-down of p38 instead of ERK by their specific siRNA significantly eliminated the nephrotoxicity induced by OTA. Contrary, knock-down of ERK1/2 instead of p38 by their specific siRNA significantly eliminated the immunotoxicity induced by OTA. The observed effects indicate that OTA induced nephrotoxicity by p38 signaling pathway in PK15 cells and immunotoxicity by ERK signaling pathway in porcine primary splenocytes.
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Affiliation(s)
- Fang Gan
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, China; Institute of Nutritional and Metabolic Disorders in Domestic Animals and Fowls, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, China
| | - Yaojiao Zhou
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, China; Institute of Nutritional and Metabolic Disorders in Domestic Animals and Fowls, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, China
| | - Lili Hou
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, China; Institute of Nutritional and Metabolic Disorders in Domestic Animals and Fowls, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, China
| | - Gang Qian
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, China; Institute of Nutritional and Metabolic Disorders in Domestic Animals and Fowls, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, China
| | - Xingxiang Chen
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, China; Institute of Nutritional and Metabolic Disorders in Domestic Animals and Fowls, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, China
| | - Kehe Huang
- College of Veterinary Medicine, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, China; Institute of Nutritional and Metabolic Disorders in Domestic Animals and Fowls, Nanjing Agricultural University, Nanjing 210095, Jiangsu Province, China.
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35
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Preya UH, Lee KT, Kim NJ, Lee JY, Jang DS, Choi JH. The natural terthiophene α-terthienylmethanol induces S phase cell cycle arrest of human ovarian cancer cells via the generation of ROS stress. Chem Biol Interact 2017; 272:72-79. [PMID: 28506552 DOI: 10.1016/j.cbi.2017.05.011] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2016] [Revised: 04/19/2017] [Accepted: 05/11/2017] [Indexed: 12/11/2022]
Abstract
Ovarian cancer is the most lethal gynecological malignancy worldwide. Thiophenes such as terthiophene have been shown to have anti-tumor effects on several cancer cell lines, including ovarian cancer cells. However, the underlying mechanisms behind the anti-proliferative effect of thiophenes are poorly understood. In this study, we investigated the molecular mechanisms underlying the anti-proliferative effect of α-terthienylmethanol, a terthiophene isolated from Eclipta prostrata (False Daisy), on human ovarian cancer cells. We found that α-terthienylmethanol is a more potent inhibitor of cell growth than is cisplatin in human ovarian cancer cells. α-Terthienylmethanol induces cell cycle arrest in ovarian cancer cells, as shown by the accumulation of cells in S phase. In addition, α-terthienylmethanol induced a change in S phase-related proteins cyclin A, cyclin-dependent kinase 2, and cyclin D2. Knockdown of cyclin A using specific siRNAs significantly compromised α-terthienylmethanol-induced S phase arrest. We further demonstrated that α-terthienylmethanol induced an increase in intracellular ROS, and the antioxidant N-acetyl-l-cysteine significantly reversed the S phase arrest induced by α-terthienylmethanol. Moreover, α-terthienylmethanol significantly increased the levels of p-H2AX, a DNA damage marker. These results suggest that α-terthienylmethanol inhibits the growth of human ovarian cancer cells by S phase cell cycle arrest via induction of ROS stress and DNA damage.
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Affiliation(s)
- Umma Hafsa Preya
- Department of Life and Nanopharamceutical Sciences, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemoon-gu, Seoul 02447, South Korea
| | - Kyung-Tae Lee
- Department of Life and Nanopharamceutical Sciences, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemoon-gu, Seoul 02447, South Korea; College of Pharmacy, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemoon-gu, Seoul 02447, South Korea
| | - Nam-Jung Kim
- College of Pharmacy, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemoon-gu, Seoul 02447, South Korea
| | - Jung-Yun Lee
- Department of Plant Science, Seoul National University, 1 Gwanak-ro, Gwanak-gu, Seoul 08826, South Korea
| | - Dae Sik Jang
- Department of Life and Nanopharamceutical Sciences, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemoon-gu, Seoul 02447, South Korea; College of Pharmacy, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemoon-gu, Seoul 02447, South Korea
| | - Jung-Hye Choi
- Department of Life and Nanopharamceutical Sciences, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemoon-gu, Seoul 02447, South Korea; College of Pharmacy, Kyung Hee University, 26 Kyungheedae-ro, Dongdaemoon-gu, Seoul 02447, South Korea.
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Yang X, Liu S, Huang C, Wang H, Luo Y, Xu W, Huang K. Ochratoxin A induced premature senescence in human renal proximal tubular cells. Toxicology 2017; 382:75-83. [PMID: 28286205 DOI: 10.1016/j.tox.2017.03.009] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2017] [Revised: 03/07/2017] [Accepted: 03/07/2017] [Indexed: 12/12/2022]
Abstract
Ochratoxin A (OTA) has many nephrotoxic effects and is a promising compound for the study of nephrotoxicity. Human renal proximal tubular cells (HKC) are an important model for the study of renal reabsorption, renal physiology and pathology. Since the induction of OTA in renal senescence is largely unknown, whether OTA can induce renal senescence, especially at a sublethal dose, and the mechanism of OTA toxicity remain unclear. In our study, a sublethal dose of OTA led to an enhanced senescent phenotype, β-galactosidase staining and senescence associated secretory phenotype (SASP). Cell cycle arrest and cell shape alternations also confirmed senescence. In addition, telomere analysis by RT-qPCR allowed us to classify OTA-induced senescence as a premature senescence. Western blot assays showed that the p53-p21 and the p16-pRB pathways and the ezrin-associated cell spreading changes were activated during the OTA-induced senescence of HKC. In conclusion, our results demonstrate that OTA promotes the senescence of HKC through the p53-p21 and p16-pRB pathways. The understanding of the mechanisms of OTA-induced senescence is critical in determining the role of OTA in cytotoxicity and its potential carcinogenicity.
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Affiliation(s)
- Xuan Yang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Sheng Liu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Chuchu Huang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Haomiao Wang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Yunbo Luo
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, China
| | - Wentao Xu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, China; Beijing Laboratory for Food Quality and Safety, Beijing, 100083, China
| | - Kunlun Huang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science & Nutritional Engineering, China Agricultural University, Beijing 100083, China; Beijing Laboratory for Food Quality and Safety, Beijing, 100083, China.
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Zhao T, Shen XL, Chen W, Liao X, Yang J, Wang Y, Zou Y, Fang C. Advances in research of nephrotoxicity and toxic antagonism of ochratoxin A. TOXIN REV 2016. [DOI: 10.1080/15569543.2016.1243560] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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38
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Gu Y, Barzegar M, Chen X, Wu Y, Shang C, Mahdavian E, Salvatore BA, Jiang S, Huang S. Fusarochromanone-induced reactive oxygen species results in activation of JNK cascade and cell death by inhibiting protein phosphatases 2A and 5. Oncotarget 2016; 6:42322-33. [PMID: 26517353 PMCID: PMC4747228 DOI: 10.18632/oncotarget.5996] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Accepted: 10/05/2015] [Indexed: 12/16/2022] Open
Abstract
Recent studies have shown that fusarochromanone (FC101), a mycotoxin, is cytotoxic in a variety of cell lines. However, the molecular mechanism underlying its cytotoxicity remains elusive. Here we found that FC101 induced cell death in COS7 and HEK293 cells in part by activating JNK pathway. This is evidenced by the findings that inhibition of JNK with SP600125 or expression of dominant negative c-Jun partially prevented FC101-induced cell death. Furthermore, we observed that FC101-activated JNK pathway was attributed to induction of reactive oxygen species (ROS). Pretreatment with N-acetyl-L-cysteine (NAC), a ROS scavenger and antioxidant, suppressed FC101-induced activation of JNK and cell death. Moreover, we noticed that FC101 inhibited the serine/threonine protein phosphatases 2A (PP2A) and 5 (PP5) in the cells, which was abrogated by NAC. Overexpression of PP2A or PP5 partially prevented FC101-induced activation of JNK and cell death. The results indicate that FC101-induced ROS inhibits PP2A and PP5, leading to activation of JNK pathway and consequently resulting in cell death.
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Affiliation(s)
- Ying Gu
- Laboratory of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu Province, P. R. China.,Department of Biochemistry and Molecular Biology, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Mansoureh Barzegar
- Department of Biochemistry and Molecular Biology, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Xin Chen
- Laboratory of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu Province, P. R. China.,Department of Biochemistry and Molecular Biology, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Yang Wu
- Department of Biochemistry and Molecular Biology, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Chaowei Shang
- Department of Biochemistry and Molecular Biology, Louisiana State University Health Sciences Center, Shreveport, LA, USA.,Feist-Weiller Cancer Center, Louisiana State University Health Sciences Center, Shreveport, LA, USA
| | - Elahe Mahdavian
- Department of Chemistry and Physics, Louisiana State University, Shreveport, LA, USA
| | - Brian A Salvatore
- Department of Chemistry and Physics, Louisiana State University, Shreveport, LA, USA
| | - Shanxiang Jiang
- Laboratory of Veterinary Pharmacology and Toxicology, College of Veterinary Medicine, Nanjing Agricultural University, Nanjing, Jiangsu Province, P. R. China
| | - Shile Huang
- Department of Biochemistry and Molecular Biology, Louisiana State University Health Sciences Center, Shreveport, LA, USA.,Feist-Weiller Cancer Center, Louisiana State University Health Sciences Center, Shreveport, LA, USA
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Zhao J, Qi X, Dai Q, He X, Dweep H, Guo M, Luo Y, Gretz N, Luo H, Huang K, Xu W. Toxicity study of ochratoxin A using HEK293 and HepG2 cell lines based on microRNA profiling. Hum Exp Toxicol 2016; 36:8-22. [PMID: 26893291 DOI: 10.1177/0960327116632048] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Ochratoxin A (OTA) induced DNA damage, cytotoxicity, and apoptosis in mammalian cell lines. Micro RNAs (miRNAs) are involved in physiological and developmental processes and contribute to cancer development and progression. In our study, high-throughput miRNA profiling and Kyoto Encyclopedia of Genes and Genomes analysis were applied to comparatively study the toxicity of OTA in HEK293 cells and HepG2 cells treated with 25 μM OTA for 24 h. In these two cells, the same changing miRNAs were mostly related to signal transduction pathways, whereas the different changing miRNAs were mostly related to human cancer pathways. DGCR8, Dicer1, and Drosha were significantly suppressed in HEK293 cells, indicating an impairment of miRNA biogenesis. The damage seemed more extensive in HEK293 cells. Cell models and in vivo models were also compared. Many miRNAs in vitro were markedly different from those in vivo; however, OTA toxicity was observed both in vitro and in vivo. The classification of deregulated pathways is similar. The biogenesis of miRNA was impaired in both lines. In conclusion, deregulated miRNAs in vitro are mostly related to human cancer and signal transduction pathways. The deregulated pathways in vivo are similar to those in vitro.
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Affiliation(s)
- J Zhao
- 1 Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - X Qi
- 1 Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Q Dai
- 1 Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - X He
- 1 Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - H Dweep
- 2 Medical Research Center, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - M Guo
- 1 Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - Y Luo
- 1 Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - N Gretz
- 2 Medical Research Center, Medical Faculty Mannheim, University of Heidelberg, Mannheim, Germany
| | - H Luo
- 3 State Key Laboratory of Agrobiotechnology, College of Biological Sciences, China Agricultural University, Beijing, China
| | - K Huang
- 1 Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
| | - W Xu
- 1 Beijing Advanced Innovation Center for Food Nutrition and Human Health, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China.,4 Beijing Laboratory for Food Quality and Safety, College of Food Science and Nutritional Engineering, China Agricultural University, Beijing, China
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Chen S, Zhang Z, Qing T, Ren Z, Yu D, Couch L, Ning B, Mei N, Shi L, Tolleson WH, Guo L. Activation of the Nrf2 signaling pathway in usnic acid-induced toxicity in HepG2 cells. Arch Toxicol 2016; 91:1293-1307. [PMID: 27369375 DOI: 10.1007/s00204-016-1775-y] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2016] [Accepted: 06/20/2016] [Indexed: 01/12/2023]
Abstract
Many usnic acid-containing dietary supplements have been marketed as weight loss agents, although severe hepatotoxicity and acute liver failure have been associated with their overuse. Our previous mechanistic studies revealed that autophagy, disturbance of calcium homeostasis, and ER stress are involved in usnic acid-induced toxicity. In this study, we investigated the role of oxidative stress and the Nrf2 signaling pathway in usnic acid-induced toxicity in HepG2 cells. We found that a 24-h treatment with usnic acid caused DNA damage and S-phase cell cycle arrest in a concentration-dependent manner. Usnic acid also triggered oxidative stress as demonstrated by increased reactive oxygen species generation and glutathione depletion. Short-term treatment (6 h) with usnic acid significantly increased the protein level for Nrf2 (nuclear factor erythroid 2-related factor 2), promoted Nrf2 translocation to the nucleus, up-regulated antioxidant response element (ARE)-luciferase reporter activity, and induced the expression of Nrf2-regulated targets, including glutathione reductase, glutathione S-transferase, and NAD(P)H quinone oxidoreductase-1 (NQO1). Furthermore, knockdown of Nrf2 with shRNA potentiated usnic acid-induced DNA damage and cytotoxicity. Taken together, our results show that usnic acid causes cell cycle dysregulation, DNA damage, and oxidative stress and that the Nrf2 signaling pathway is activated in usnic acid-induced cytotoxicity.
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Affiliation(s)
- Si Chen
- Division of Biochemical Toxicology, National Center for Toxicological Research (NCTR)/U.S. Food and Drug Administration (FDA), HFT-110, 3900 NCTR Road, Jefferson, AR, 72079, USA
| | - Zhuhong Zhang
- Division of Genetic and Molecular Toxicology, National Center for Toxicological Research/U.S. FDA, Jefferson, AR, 72079, USA.,Tianjin Medical University General Hospital, Tianjin, 300052, China
| | - Tao Qing
- School of Pharmacy, School of Life Sciences, Fudan-Zhangjiang Center for Clinical Genomics and Zhanjiang Center for Translational Medicine, Fudan University, Shanghai, 200438, China
| | - Zhen Ren
- Division of Biochemical Toxicology, National Center for Toxicological Research (NCTR)/U.S. Food and Drug Administration (FDA), HFT-110, 3900 NCTR Road, Jefferson, AR, 72079, USA
| | - Dianke Yu
- Division of Systems Biology, National Center for Toxicological Research/U.S. FDA, Jefferson, AR, 72079, USA
| | - Letha Couch
- Division of Biochemical Toxicology, National Center for Toxicological Research (NCTR)/U.S. Food and Drug Administration (FDA), HFT-110, 3900 NCTR Road, Jefferson, AR, 72079, USA
| | - Baitang Ning
- Division of Systems Biology, National Center for Toxicological Research/U.S. FDA, Jefferson, AR, 72079, USA
| | - Nan Mei
- Division of Genetic and Molecular Toxicology, National Center for Toxicological Research/U.S. FDA, Jefferson, AR, 72079, USA
| | - Leming Shi
- School of Pharmacy, School of Life Sciences, Fudan-Zhangjiang Center for Clinical Genomics and Zhanjiang Center for Translational Medicine, Fudan University, Shanghai, 200438, China
| | - William H Tolleson
- Division of Biochemical Toxicology, National Center for Toxicological Research (NCTR)/U.S. Food and Drug Administration (FDA), HFT-110, 3900 NCTR Road, Jefferson, AR, 72079, USA
| | - Lei Guo
- Division of Biochemical Toxicology, National Center for Toxicological Research (NCTR)/U.S. Food and Drug Administration (FDA), HFT-110, 3900 NCTR Road, Jefferson, AR, 72079, USA.
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41
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Heussner A, Paget T. Evaluation of renal in vitro models used in ochratoxin research. WORLD MYCOTOXIN J 2016. [DOI: 10.3920/wmj2015.1975] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
Ochratoxin A (OTA) induces renal carcinomas in rodents with a specific localisation in the S3 segment of proximal tubules and distinct early severe tissue alterations, which have been observed also in other species. Pronounced species- and sex-specific differences in toxicity occur and similar effects cannot be excluded in humans, however precise mechanism(s) remain elusive until today. In such cases, the use of in vitro models for mechanistic investigations can be very useful; in particular if a non-genotoxic mechanism of cancer formation is assumed which include cytotoxic effects. However, potential genotoxic mechanisms can also be investigated in vitro. A crucial issue of in vitro research is the choice of the appropriate cell model. Apparently, the cellular target of OTA is the renal proximal tubular cell; therefore cells from this tissue area are the most reasonable model. Furthermore, cells from affected species should be used and can be compared to cells of human origin. Another important parameter is whether to use primary cultures or to choose a cell line from the huge variety of cell lines available. In any case, important characteristics and quality controls need to be verified beforehand. Therefore, this review discusses the renal in vitro models that have been used for the investigation of renal ochratoxin toxicity. In particular, we discuss the choice of the models and the essential parameters making them suitable models for ochratoxin research together with exemplary results from this research. Furthermore, new promising models such as hTERT-immortalised cells and 3D-cultures are briefly discussed.
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Affiliation(s)
- A.H. Heussner
- Human and Environmental Toxicology, University of Konstanz, Universitätsstrasse 10, 78457 Konstanz, Germany
- Pharmacy Health and Well-being, University of Sunderland, Sciences Complex, Wharncliffe Street, Sunderland SR1 3SD, United Kingdom
| | - T. Paget
- Pharmacy Health and Well-being, University of Sunderland, Sciences Complex, Wharncliffe Street, Sunderland SR1 3SD, United Kingdom
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Ochratoxin A: Molecular Interactions, Mechanisms of Toxicity and Prevention at the Molecular Level. Toxins (Basel) 2016; 8:111. [PMID: 27092524 PMCID: PMC4848637 DOI: 10.3390/toxins8040111] [Citation(s) in RCA: 163] [Impact Index Per Article: 20.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2016] [Revised: 03/31/2016] [Accepted: 04/06/2016] [Indexed: 01/28/2023] Open
Abstract
Ochratoxin A (OTA) is a widely-spread mycotoxin all over the world causing major health risks. The focus of the present review is on the molecular and cellular interactions of OTA. In order to get better insight into the mechanism of its toxicity and on the several attempts made for prevention or attenuation of its toxic action, a detailed description is given on chemistry and toxicokinetics of this mycotoxin. The mode of action of OTA is not clearly understood yet, and seems to be very complex. Inhibition of protein synthesis and energy production, induction of oxidative stress, DNA adduct formation, as well as apoptosis/necrosis and cell cycle arrest are possibly involved in its toxic action. Since OTA binds very strongly to human and animal albumin, a major emphasis is done regarding OTA-albumin interaction. Displacement of OTA from albumin by drugs and by natural flavonoids are discussed in detail, hypothesizing their potentially beneficial effect in order to prevent or attenuate the OTA-induced toxic consequences.
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Ochratoxin A-induced cytotoxicity, genotoxicity and reactive oxygen species in kidney cells: An integrative approach of complementary endpoints. Food Chem Toxicol 2016; 87:65-76. [DOI: 10.1016/j.fct.2015.11.018] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2015] [Revised: 11/19/2015] [Accepted: 11/21/2015] [Indexed: 01/26/2023]
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Yang Q, Shi L, Huang K, Xu W. Protective effect of N-acetylcysteine against DNA damage and S-phase arrest induced by ochratoxin A in human embryonic kidney cells (HEK-293). Food Chem Toxicol 2014; 70:40-7. [DOI: 10.1016/j.fct.2014.04.039] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2014] [Revised: 03/30/2014] [Accepted: 04/25/2014] [Indexed: 12/29/2022]
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