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Quercetin Attenuates Quinocetone-Induced Cell Apoptosis In Vitro by Activating the P38/Nrf2/HO-1 Pathway and Inhibiting the ROS/Mitochondrial Apoptotic Pathway. Antioxidants (Basel) 2022; 11:antiox11081498. [PMID: 36009217 PMCID: PMC9405464 DOI: 10.3390/antiox11081498] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2022] [Revised: 07/25/2022] [Accepted: 07/28/2022] [Indexed: 01/25/2023] Open
Abstract
Quinocetone (QCT), a member of the quinoxaline 1,4-di-N-oxides (QdNOs) family, can cause genotoxicity and hepatotoxicity, however, the precise molecular mechanisms of QCT are unclear. This present study investigated the protective effect of quercetin on QCT-induced cytotoxicity and the underlying molecular mechanisms in human L02 and HepG2 cells. The results showed that quercetin treatment (at 7.5–30 μM) significantly improved QCT-induced cytotoxicity and oxidative damage in human L02 and HepG2 cells. Meanwhile, quercetin treatment at 30 μM significantly inhibited QCT-induced loss of mitochondrial membrane potential, an increase in the expression of the CytC protein and the Bax/Bcl-2 ratio, and an increase in caspases-9 and -3 activity, and finally improved cell apoptosis. Quercetin pretreatment promoted the expression of the phosphorylation of p38, Nrf2, and HO-1 proteins. Pharmacological inhibition of p38 significantly inhibited quercetin-mediated activation of the Nrf2/HO-1 pathway. Consistently, pharmacological inhibitions of the Nrf2 or p38 pathways both promoted QCT-induced cytotoxicity and partly abolished the protective effects of quercetin. In conclusion, for the first time, our results reveal that quercetin could improve QCT-induced cytotoxicity and apoptosis by activating the p38/Nrf2/HO-1 pathway and inhibiting the ROS/mitochondrial apoptotic pathway. Our study highlights that quercetin may be a promising candidate for preventing QdNOs-induced cytotoxicity in humans or animals.
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Qian L, Yang F, Lin X, Jiang S, Zhang Y, Tang Y. Pyrroloquinoline quinone ameliorates liver injury in mice induced by cyclophosphamide. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:30383-30393. [PMID: 34997497 DOI: 10.1007/s11356-021-17990-6] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Accepted: 12/03/2021] [Indexed: 06/14/2023]
Abstract
The current study aimed to investigate the potential ameliorative effects of pyrroloquinoline quinone (PQQ) on cyclophosphamide (CTX)-induced liver injury in mice. The liver injury model was established by injecting mice with CTX (80 mg/kg/day). Liver function indices, antioxidant enzyme activities, and inflammatory cytokines were evaluated. In addition, protein expression levels of the nuclear factor E2-related factor 2 (Nrf2) and nuclear factor kappa-B (NF-κB) pathways in the liver tissues were determined using western blot. The results indicated that PQQ decreased the serum alanine aminotransferase (ALT), aspartate aminotransferase (AST), and the malondialdehyde (MDA), interleukin (IL)-1β, IL-6, tumor necrosis factor-α (TNF-α) levels in the liver tissues. Moreover, PQQ enhanced the activities of oxidative stress markers to alleviate CTX induced oxidative stress. Furthermore, the expression levels of heme oxygenase-1 (HO-1), glutamate-cysteine ligase modifier subunit (GCLM), and NAD(P)H quinone oxidoreductase 1 (NQO1) were significantly increased, and the expression levels of NF-κB p50, NF-κB p65, and inhibitor of NF-κB kinase alpha (IKKα) were significantly decreased after PQQ administration, suggesting that PQQ alleviated CTX-induced liver injury via activating the Nrf2-mediated antioxidant response pathway, and inhibiting the NF-κB-mediated inflammation pathway. Therefore, PQQ can be potentially used as a dietary supplement or functional foods for alleviating the CTX-induced liver injury.
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Affiliation(s)
- Li Qian
- Zhejiang Provincial Engineering Technology Research Center of Marine Biomedical Products, School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Fei Yang
- Hangzhou Women's Hospital (Hangzhou Maternity and Child Health Care Hospital), Neonatal Intensive Care Unit, Hangzhou, 310008, People's Republic of China
| | - Xinhui Lin
- Zhejiang Provincial Engineering Technology Research Center of Marine Biomedical Products, School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China
| | - Su Jiang
- ECA Healthcare Inc, Shanghai, 201101, People's Republic of China
| | - Yun Zhang
- Qianjiang College, Hangzhou Normal University, Hangzhou, 310012, People's Republic of China.
| | - Yunping Tang
- Zhejiang Provincial Engineering Technology Research Center of Marine Biomedical Products, School of Food and Pharmacy, Zhejiang Ocean University, Zhoushan, 316022, People's Republic of China.
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3
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Ge L, Gao YQ, Han Z, Liu SJ, Wang XY, Zhang XJ, Tang RH, Zhang RF, Sun D, Feng B, Zhang DJ, Liang CG. Administration of olaquindox impairs spermatogenesis and sperm quality by increasing oxidative stress and early apoptosis in mice. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2022; 234:113396. [PMID: 35278996 DOI: 10.1016/j.ecoenv.2022.113396] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/26/2021] [Revised: 03/02/2022] [Accepted: 03/05/2022] [Indexed: 06/14/2023]
Abstract
Olaquindox (OLA), a potent antibacterial agent, has been widely used as a feed additive and growth promoter in animal husbandry. Our previous study has shown that OLA administration in female mice could markedly cause sub-fertility. Here we established the model in male mice to investigate the toxic effects of OLA on mammalian spermatozoa quality and fetal development. After continuous 45 days of OLA gavage, the dosage of 60 mg/kg/day (high dose) significantly affected body weight, organ weights and coefficients, and the morphology of the testis seminiferous tubule in male mice. Dosage of 60 mg/kg/day also reduced sperm count, motility, and viability. OLA at both low-dose (5 mg/kg/day) and high-dose induced peroxidation, early apoptosis, and abnormal mitochondrial membrane potential in sperm. Significantly, high-dose OLA impaired in vitro fertilized embryo development, indicated by the decreased percentages of 2-cell and blastocyst formation. Surprisingly, the natural fertility of males was unaffected after OLA gavage, which was indicated by the comparable litter size after mating. However, paternal gavage of OLA significantly decreased the survival rate of the offspring from the age of 4 weeks. In sum, our study showed that OLA gavage in male mice damages sperm quality and offspring survival, illustrating the use of OLA as a feed additive should be strictly restricted.
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Affiliation(s)
- Lei Ge
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, People's Republic of China
| | - Yu-Qing Gao
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, People's Republic of China
| | - Zhe Han
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, People's Republic of China
| | - Shu-Jun Liu
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, People's Republic of China
| | - Xing-Yue Wang
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, People's Republic of China
| | - Xiao-Jie Zhang
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, People's Republic of China
| | - Rui-Hao Tang
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, People's Republic of China
| | - Rui-Feng Zhang
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, People's Republic of China
| | - Dui Sun
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, People's Republic of China
| | - Bo Feng
- Reprobiotech Corp China LTD, Liaocheng city, Shandong Province, People's Republic of China
| | - De-Jian Zhang
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, People's Republic of China.
| | - Cheng-Guang Liang
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, People's Republic of China.
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Sviridova DA, Machigov EA, Igonina EV, Zhoshibekova BS, Abilev SK. Studying the Mechanism of Dioxidine Genotoxicity Using Lux Biosensors of Esсherichia coli. BIOL BULL+ 2022. [DOI: 10.1134/s1062359021120098] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Lv Y, Yu Z, Huang S, Deng F, Zheng K, Yang G, Liu Y, Lin C, Ye X, Liu M. Rapidly photocatalytic mineralization of typical veterinary drugs with the SnO 2/SnIn 4S 8 composite. CHEMOSPHERE 2021; 271:129452. [PMID: 33434825 DOI: 10.1016/j.chemosphere.2020.129452] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Revised: 12/15/2020] [Accepted: 12/24/2020] [Indexed: 06/12/2023]
Abstract
Considering the high environmental risk, the remediation of veterinary drug pollutants aroused numerous concerning. In this paper, a novel photocatlyst, SnO2/SnIn4S8, was fabricated by in situ precipitation and hydrothermal method and then employed to simulate photocatalytic degradation of olaquindox under visible light. The SEM, TEM, XRD, XPS and electrochemical results clearly showed that the n-type heterojunction between SnO2 and SnIn4S8 was successfully constructed, which greatly reduce the recombination of the photogenic electron and holes, leading to the improvement of photocalytic performance and stability (recycled over 10 times). Besides, the SnO2/SnIn4S8 composite also exhibited good ability to mineralize the olaquindox. Under the optimal condition (pH of 3, 1 g L-1 of 30 wt% SnO2/SnIn4S8 and 10 mg L-1 of initial olaquindox concentration), the olaquindox could be fully and rapidly degraded in 25 min, and completely mineralized in 2 h (99.3 ± 1.7%). LC-QTOF-MS analysis evidently displayed 10 intermediates during the olaquindox degradation. In addition, with the attack of the reactive oxygen species (h+, •OH and •O2-), olaquindox could be effectively decomposed via deoxygenation, hydroxylation and carboxylation reactions. Importantly, compared to photodegradation, the photocatalytic process was an ideal way to eliminate the olaquindox form water because it could avoid the accumulation of toxic byproducts.
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Affiliation(s)
- Yuancai Lv
- Research Institute of Photocatalysis, College of Environment & Resources, Fuzhou University, Fuzhou, 350116, China.
| | - Zhendong Yu
- Research Institute of Photocatalysis, College of Environment & Resources, Fuzhou University, Fuzhou, 350116, China.
| | - Siyi Huang
- Research Institute of Photocatalysis, College of Environment & Resources, Fuzhou University, Fuzhou, 350116, China.
| | - Fucai Deng
- Guangdong Provincial Key Laboratory of Petrochemical Pollution Process and Control, School of Environmental Science and Engineering, Guangdong University of Petrochemical Technology, Maoming, 525000, PR China.
| | - Kaiyun Zheng
- School of Civil and Environment Engineering, Harbin Institute of Technology Shenzhen Graduate School, Shenzhen, 518055, China.
| | - Guifang Yang
- Research Institute of Photocatalysis, College of Environment & Resources, Fuzhou University, Fuzhou, 350116, China.
| | - Yifan Liu
- Research Institute of Photocatalysis, College of Environment & Resources, Fuzhou University, Fuzhou, 350116, China.
| | - Chunxiang Lin
- Research Institute of Photocatalysis, College of Environment & Resources, Fuzhou University, Fuzhou, 350116, China.
| | - Xiaoxia Ye
- Research Institute of Photocatalysis, College of Environment & Resources, Fuzhou University, Fuzhou, 350116, China.
| | - Minghua Liu
- Research Institute of Photocatalysis, College of Environment & Resources, Fuzhou University, Fuzhou, 350116, China.
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Rivera G. Quinoxaline 1,4-di-N-Oxide Derivatives: Are They Unselective or Selective Inhibitors? Mini Rev Med Chem 2021; 22:15-25. [PMID: 33573542 DOI: 10.2174/1389557521666210126142541] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2020] [Revised: 11/07/2020] [Accepted: 12/07/2020] [Indexed: 11/22/2022]
Abstract
BACKGROUND For decades, the quinoxaline 1,4-di-N-oxide ring has been considered a privileged structure to develop new antibacterial, antitumoural, and antiprotozoal agents, among others, however its mechanism of action is not clear. OBJECTIVE The main aim of this mini-review was to analyze the mechanism of action of quinoxaline 1,4-di-N-oxide derivatives reported as antibacterial, antitumoural and antiprotozoal agents. RESULTS Initially, the mechanism of action of quinoxaline 1,4-di-N-oxide derivatives against bacteria, tumoural cell lines, and parasites has been described as nonspecific, but recently, the results against different organisms have shown that these compounds have an inhibitory action on specific targets such as trypanothione reductase, triosephosphate isomerase, and other essential enzymes. CONCLUSION In summary, quinoxaline 1,4-di-N-oxide is a scaffold to develop new anti-Mycobacterium tuberculosis, antitumoural and antiprotozoal agents, however, understanding the mechanism of action of quinoxaline 1,4-di-N-oxide derivatives in each microorganism could contribute to the development of new, and more potent selective drugs.
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Affiliation(s)
- Gildardo Rivera
- Laboratorio de Biotecnología Farmacéutica, Centro de Biotecnología Genómica, Instituto Politécnico Nacional, 88710 Reynosa. Mexico
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7
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Olaquindox-Induced Liver Damage Involved the Crosstalk of Oxidative Stress and p53 In Vivo and In Vitro. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2020; 2020:8835207. [PMID: 33381272 PMCID: PMC7762677 DOI: 10.1155/2020/8835207] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/26/2020] [Revised: 11/27/2020] [Accepted: 12/03/2020] [Indexed: 01/21/2023]
Abstract
Olaquindox (OLA), a member of the quinoxaline-N,N-dioxide family, has been widely used as a growth-promoting feed additive and treatment for bacterial infections. The toxicity has been a major concern, and the precise molecular mechanism remains poorly understood. The present study was aimed at investigating the roles of oxidative stress and p53 in OLA-caused liver damage. In a mouse model, OLA administration could markedly cause liver injury as well as the induction of oxidative stress and activation of p53. Antioxidant N-acetylcysteine (NAC) inhibited OLA-induced oxidative stress and p53 activation in vivo. Furthermore, knockout of the p53 gene could significantly inhibit OLA-induced liver damage by inhibiting oxidative stress and the mitochondria apoptotic pathway, compared to the p53 wild-type liver tissue. The cell model in vitro further demonstrated that p53 knockout or knockdown in the HCT116 cell and L02 cell significantly inhibited cell apoptosis and increased cell viability, presented by suppressing ROS production, oxidative stress, and the Nrf2/HO-1 pathway. Moreover, loss of p53 decreased OLA-induced mitochondrial dysfunction and caspase activations, with the evidence of inhibited activation of phosphorylation- (p-) p38 and p-JNK and upregulated cell autophagy via activation of the LC3 and Beclin1 pathway in HCT116 and L02 cells. Taken together, our findings provided a support that p53 primarily played a proapoptotic role in OLA-induced liver damage against oxidative stress and mitochondrial dysfunction, which were largely dependent on suppression of the JNK/p38 pathway and upregulation of the autophagy pathway via activation of LC3 and Beclin1.
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8
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Gao YQ, Ge L, Han Z, Hao X, Zhang ML, Zhang XJ, Zhou CJ, Zhang DJ, Liang CG. Oral administration of olaquindox negatively affects oocytes quality and reproductive ability in female mice. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2020; 201:110826. [PMID: 32521368 DOI: 10.1016/j.ecoenv.2020.110826] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2019] [Revised: 05/26/2020] [Accepted: 05/27/2020] [Indexed: 06/11/2023]
Abstract
As an effective feed additive in the livestock industry, olaquindox (OLA) has been widely used in domestic animal production. However, it is unclear whether OLA has negative effects on mammalian oocyte quality and fetal development. In this study, toxic effects of OLA were tested by intragastric gavage ICR mice with water, low-dose OLA (5 mg/kg/day), or high-dose OLA (60 mg/kg/day) for continuous 45 days. Results showed that high-dose OLA gavage severely affected the offspring birth and growth. Significantly, high-dose OLA impaired oocyte maturation and early embryo development, indicated by the decreased percentage of germinal vesicle breakdown, first polar body extrusion and blastocyst formation. Meanwhile, oxidative stress levels were increased in oocytes or ovaries, indexed by the increased levels of ROS, MDA, H2O2, NO, and decreased levels of GSH, SOD, CAT, GSH-Px and GSH-Rd. Furthermore, aberrant mitochondria distribution, defective spindle assembly, abnormal H3K4me2/H3K9me3 levels, increased DNA double-strand breaks and early apoptosis rate, were observed after high-dose OLA gavage. Taken together, our results for the first time illustrated that high-dose OLA gavage led to sub-fertility of females, which means that restricted utilization of OLA as feed additive should be considered.
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Affiliation(s)
- Yu-Qing Gao
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, People's Republic of China
| | - Lei Ge
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, People's Republic of China
| | - Zhe Han
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, People's Republic of China
| | - Xin Hao
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, People's Republic of China
| | - Mei-Ling Zhang
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, People's Republic of China
| | - Xiao-Jie Zhang
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, People's Republic of China
| | - Cheng-Jie Zhou
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, People's Republic of China
| | - De-Jian Zhang
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, People's Republic of China
| | - Cheng-Guang Liang
- State Key Laboratory of Reproductive Regulation & Breeding of Grassland Livestock, School of Life Sciences, Inner Mongolia University, Hohhot, People's Republic of China.
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Li D, Zhang Y, Pei X, Liu X, Dai C, Li C, Li L, Zhang J, Xiao X, Tang S. Molecular mechanism of olaquindox-induced hepatotoxicity and the hepatic protective role of curcumin. Food Chem Toxicol 2020; 145:111727. [PMID: 32898599 DOI: 10.1016/j.fct.2020.111727] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2020] [Revised: 08/11/2020] [Accepted: 08/30/2020] [Indexed: 01/06/2023]
Abstract
Olaquindox (OLA) is a chemosynthetic growth promoter, which could promote the treatment of bacterial infections and improve feed energy efficiency. Hepatotoxicity is still a poor feature associated with the adverse effects of OLA. The present study aimed to investigate the molecular mechanism of OLA-induced hepatotoxicity and the protective role of curcumin in mice and HepG2 cells. The result showed that representative biomarkers involved in mitochondrial pathway, p53 pathway, mitogen-activated protein kinase (MAPK) pathway, autophagy and antioxidant pathway were activated. Furthermore, curcumin attenuated OLA-induced serum alanine aminotransferase (ALT) and aspartate aminotransferase (AST) and liver damage in mice. In addition, cell viability of HepG2 was enhanced by curcumin pretreatment at 5, 10 and 20 μM. Meanwhile, curcumin markedly ameliorated OLA-induced oxidative stress, apoptosis and mitochondrial dysfunction. Moreover, curcumin pretreatment significantly up-regulated the expressions of nuclear factor erythroid-2-related factor 2 (Nrf2) and heme oxygenase-1(HO-1) and down-regulated the expressions of nuclear factor-kappaB (NF-kB) and p53 through reduced the nuclear translocation of NF-kB induced by OLA. In summary, our findings indicated that OLA-induced hepatotoxicity involved in mitochondrial apoptosis, autophagy, p53 pathway, Nrf2/HO-1 pathways, and curcumin regulated OLA-induced liver damage, oxidative stress and apoptosis via activation of Nrf2/HO-1 pathway and suppression of p53 and NF-kB pathway.
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Affiliation(s)
- Daowen Li
- Tianjin Key Laboratory of Agricultural Animal Breeding and Healthy Husbandry, College of Animal Science and Veterinary Medicine, Tianjin Agricultural University, Jinjing Road No.22, Xiqing District, Tianjin 300384, China; Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No.2, Haidian District, Beijing 100193, China
| | - Yan Zhang
- Tianjin Key Laboratory of Agricultural Animal Breeding and Healthy Husbandry, College of Animal Science and Veterinary Medicine, Tianjin Agricultural University, Jinjing Road No.22, Xiqing District, Tianjin 300384, China
| | - Xingyao Pei
- Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No.2, Haidian District, Beijing 100193, China
| | - Xinyu Liu
- Tianjin Key Laboratory of Agricultural Animal Breeding and Healthy Husbandry, College of Animal Science and Veterinary Medicine, Tianjin Agricultural University, Jinjing Road No.22, Xiqing District, Tianjin 300384, China
| | - Chongshan Dai
- Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No.2, Haidian District, Beijing 100193, China
| | - Cun Li
- Tianjin Key Laboratory of Agricultural Animal Breeding and Healthy Husbandry, College of Animal Science and Veterinary Medicine, Tianjin Agricultural University, Jinjing Road No.22, Xiqing District, Tianjin 300384, China
| | - Liuan Li
- Tianjin Key Laboratory of Agricultural Animal Breeding and Healthy Husbandry, College of Animal Science and Veterinary Medicine, Tianjin Agricultural University, Jinjing Road No.22, Xiqing District, Tianjin 300384, China
| | - Jianbin Zhang
- Tianjin Key Laboratory of Agricultural Animal Breeding and Healthy Husbandry, College of Animal Science and Veterinary Medicine, Tianjin Agricultural University, Jinjing Road No.22, Xiqing District, Tianjin 300384, China
| | - Xilong Xiao
- Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No.2, Haidian District, Beijing 100193, China
| | - Shusheng Tang
- Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No.2, Haidian District, Beijing 100193, China.
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Silva L, Coelho P, Teixeira D, Monteiro A, Pinto G, Soares R, Prudêncio C, Vieira M. Oxidative Stress Modulation and Radiosensitizing Effect of Quinoxaline-1,4-Dioxides Derivatives. Anticancer Agents Med Chem 2020; 20:111-120. [DOI: 10.2174/1871520619666191028091547] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/15/2019] [Revised: 09/24/2019] [Accepted: 09/25/2019] [Indexed: 12/12/2022]
Abstract
Background:
Quinoxaline-1,4-dioxide (QNX) derivatives are synthetic heterocyclic compounds with
multiple biological and pharmacological effects.
Objective:
In this study, we investigated the oxidative status of quinoxaline-1,4-dioxides derivatives in modulating
melanoma and glioma cell lines, based on previous results from the research group and their capability to
promote cell damage by the production of Reactive Oxygen Species (ROS).
Methods:
Using in vitro cell cultures, the influence of 2-amino-3-cyanoquinoxaline-1,4-dioxide (2A3CQNX), 3-
methyl-2-quinoxalinecarboxamide-1,4-dioxide (3M2QNXC) and 2-hydroxyphenazine-1,4-dioxide (2HF) was
evaluated in metabolic activity, catalase activity, glutathione and 3-nitrotyrosine (3-NT) quantitation by HPLC
in malignant melanocytes (B16-F10, MeWo) and brain tumor cells (GL-261 and BC3H1) submitted to radiotherapy
treatments (total dose of 6 Gy).
Results:
2HF increased the levels of 3-NT in non-irradiated MeWo and glioma cell lines and decreased cell
viability in these cell lines with and without irradiation.
Conclusions:
Quinoxaline-1,4-dioxides derivatives modulate the oxidative status in malignant melanocytes and
brain tumor cell lines and exhibited a potential radiosensitizer in vitro action on the tested radioresistant cell
lines.
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Affiliation(s)
- Liliana Silva
- Centro de Investigacao em Saude Ambiental (CISA), Escola Superior de Saude do Porto, Politecnico do Porto, Porto, Portugal
| | - Pedro Coelho
- Centro de Investigacao em Saude Ambiental (CISA), Escola Superior de Saude do Porto, Politecnico do Porto, Porto, Portugal
| | - Dulce Teixeira
- Centro de Investigacao em Saude Ambiental (CISA), Escola Superior de Saude do Porto, Politecnico do Porto, Porto, Portugal
| | - Armanda Monteiro
- Servico de Radioterapia, Centro Hospitalar de Sao Joao, Porto, Portugal
| | - Gabriela Pinto
- Servico de Radioterapia, Centro Hospitalar de Sao Joao, Porto, Portugal
| | - Raquel Soares
- Departamento de Biomedicina, Unidade de Bioquimica, Faculdade de Medicina, Universidade do Porto, Porto, Portugal
| | - Cristina Prudêncio
- Centro de Investigacao em Saude Ambiental (CISA), Escola Superior de Saude do Porto, Politecnico do Porto, Porto, Portugal
| | - Mónica Vieira
- Centro de Investigacao em Saude Ambiental (CISA), Escola Superior de Saude do Porto, Politecnico do Porto, Porto, Portugal
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11
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Guo L, Wu X, Cui G, Song S, Kuang H, Xu C. Colloidal Gold Immunochromatographic Assay for Rapid Detection of Carbadox and Cyadox in Chicken Breast. ACS OMEGA 2020; 5:1422-1429. [PMID: 32010814 PMCID: PMC6990421 DOI: 10.1021/acsomega.9b02931] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/09/2019] [Accepted: 10/11/2019] [Indexed: 05/21/2023]
Abstract
Abused or misused carbadox (CBX) and cyadox (CYA) in animal feed may cause food safety concerns, threatening human health. Here, we describe the design of a novel hapten for preparation of a monoclonal antibody against CBX and CYA simultaneously. Using this antibody, colloidal gold immunochromatographic assay (GICA) was developed for screening of CBX and CYA residues in chicken breast. Under optimal conditions, semiquantitative analysis results were visible by eye, with a visual limit of detection of 8 μg/kg for CBX and CYA, and cut-off values of 20 μg/kg for CBX and 40 μg/kg for CYA in chicken breast. Quantitative analysis could be performed using a hand-held strip scanner, with a calculated limit of detection of 2.92 μg/kg for CBX and 2.68 μg/kg for CYA in chicken breast. Validated by liquid chromatography-MS/MS, the developed GICA provides a useful tool for rapid on-site CBX and CYA residue screening in chicken breast.
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Affiliation(s)
- Lingling Guo
- State
Key Lab of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People’s Republic of China
- School
of Food Science and Technology, Collaborative Innovation Center of
Food Safety and Quality Control in Jiangsu Province, Jiangnan University, Wuxi, Jiangsu 214122, People’s Republic of China
| | - Xiaoling Wu
- State
Key Lab of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People’s Republic of China
- School
of Food Science and Technology, Collaborative Innovation Center of
Food Safety and Quality Control in Jiangsu Province, Jiangnan University, Wuxi, Jiangsu 214122, People’s Republic of China
- E-mail: (X.W.)
| | - Gang Cui
- YanCheng
Teachers University, Yancheng 224100, People’s Republic
of China
| | - Shanshan Song
- State
Key Lab of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People’s Republic of China
- School
of Food Science and Technology, Collaborative Innovation Center of
Food Safety and Quality Control in Jiangsu Province, Jiangnan University, Wuxi, Jiangsu 214122, People’s Republic of China
| | - Hua Kuang
- State
Key Lab of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People’s Republic of China
- School
of Food Science and Technology, Collaborative Innovation Center of
Food Safety and Quality Control in Jiangsu Province, Jiangnan University, Wuxi, Jiangsu 214122, People’s Republic of China
| | - Chuanlai Xu
- State
Key Lab of Food Science and Technology, Jiangnan University, Wuxi, Jiangsu 214122, People’s Republic of China
- School
of Food Science and Technology, Collaborative Innovation Center of
Food Safety and Quality Control in Jiangsu Province, Jiangnan University, Wuxi, Jiangsu 214122, People’s Republic of China
- E-mail: (C.X.)
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12
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Biological activity of esters of quinoxaline-7-carboxylate 1,4-di-N-oxide against E. histolytica and their analysis as potential thioredoxin reductase inhibitors. Parasitol Res 2020; 119:695-711. [PMID: 31907668 DOI: 10.1007/s00436-019-06580-8] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2019] [Accepted: 12/12/2019] [Indexed: 02/07/2023]
Abstract
Amoebiasis is caused by the protozoan Entamoeba histolytica that affects millions of people throughout the world. The standard treatment is metronidazole, however, this drug causes several side effects, and is also mutagenic and carcinogenic. Therefore, the search for therapeutic alternatives is necessary. Quinoxaline 1,4-di-N-oxides (QdNOs) derivatives have been shown to exhibit activity against different protozoan. In the present study, the effects of esters of quinoxaline-7-carboxylate 1,4-di-N-oxide (7-carboxylate QdNOs) derivatives on E. histolytica proliferation, morphology, ultrastructure, and oxidative stress were evaluated, also their potential as E. histolytica thioredoxin reductase (EhTrxR) inhibitors was analyzed. In vitro tests showed that 12 compounds from n-propyl and isopropyl series, were more active (IC50 = 0.331 to 3.56 μM) than metronidazole (IC50 = 4.5 μM). The compounds with better biological activity have a bulky, trifluoromethyl and isopropyl group at R1-, R2-, and R3-position, respectively. The main alterations found in trophozoites treated with some of these compounds included changes in chromatin, cell granularity, redistribution of vacuoles with cellular debris, and an increase in reactive oxygen species. Interestingly, docking studies suggested that 7-carboxylate QdNOs derivatives could interact with amino acid residues of the NADPH-binding domain and/or the redox-active site of EhTrxR. Enzymatic assays demonstrated that selected 7-carboxylate QdNOs inhibits EhTrxR disulfide reductase activity, and diaphorase activity shows that these compounds could act as electron acceptor substrates for the enzyme. Taken together, these data indicate that among the mechanisms involved in the antiamoebic effect of the 7-carboxylate QdNOs derivatives studied, is the induction of oxidative stress and the inhibition of EhTrxR activity.
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13
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Čolović R, Puvača N, Cheli F, Avantaggiato G, Greco D, Đuragić O, Kos J, Pinotti L. Decontamination of Mycotoxin-Contaminated Feedstuffs and Compound Feed. Toxins (Basel) 2019; 11:E617. [PMID: 31731462 PMCID: PMC6891401 DOI: 10.3390/toxins11110617] [Citation(s) in RCA: 84] [Impact Index Per Article: 16.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2019] [Revised: 10/16/2019] [Accepted: 10/23/2019] [Indexed: 01/15/2023] Open
Abstract
Mycotoxins are known worldwide as fungus-produced toxins that adulterate a wide heterogeneity of raw feed ingredients and final products. Consumption of mycotoxins-contaminated feed causes a plethora of harmful responses from acute toxicity to many persistent health disorders with lethal outcomes; such as mycotoxicosis when ingested by animals. Therefore, the main task for feed producers is to minimize the concentration of mycotoxin by applying different strategies aimed at minimizing the risk of mycotoxin effects on animals and human health. Once mycotoxins enter the production chain it is hard to eliminate or inactivate them. This paper examines the most recent findings on different processes and strategies for the reduction of toxicity of mycotoxins in animals. The review gives detailed information about the decontamination approaches to mitigate mycotoxin contamination of feedstuffs and compound feed, which could be implemented in practice.
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Affiliation(s)
- Radmilo Čolović
- Institute of Food Technology, University of Novi Sad, Bulevar cara Lazara, 21000 Novi Sad, Serbia; (O.Đ.); (J.K.)
| | - Nikola Puvača
- Department of Engineering Management in Biotechnology, Faculty of Economics and Engineering Management in Novi Sad, University Business Academy in Novi Sad, Cvećarska, 21000 Novi Sad, Serbia
| | - Federica Cheli
- Department of Health, Animal Science and Food Safety, University of Milan, Via Trentacoste, 20134 Milan, Italy;
| | - Giuseppina Avantaggiato
- Institute of Sciences of Food Production (ISPA), National Research Council (CNR), Via Amendola, 70126 Bari, Italy; (G.A.); (D.G.)
| | - Donato Greco
- Institute of Sciences of Food Production (ISPA), National Research Council (CNR), Via Amendola, 70126 Bari, Italy; (G.A.); (D.G.)
| | - Olivera Đuragić
- Institute of Food Technology, University of Novi Sad, Bulevar cara Lazara, 21000 Novi Sad, Serbia; (O.Đ.); (J.K.)
| | - Jovana Kos
- Institute of Food Technology, University of Novi Sad, Bulevar cara Lazara, 21000 Novi Sad, Serbia; (O.Đ.); (J.K.)
| | - Luciano Pinotti
- Department of Health, Animal Science and Food Safety, University of Milan, Via Trentacoste, 20134 Milan, Italy;
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14
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Identification of N-Oxide-Containing Aromatic Heterocycles as Pharmacophores for Rumen Fermentation Modifiers. Metabolites 2019; 9:metabo9040062. [PMID: 30986899 PMCID: PMC6523752 DOI: 10.3390/metabo9040062] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Revised: 03/05/2019] [Accepted: 03/08/2019] [Indexed: 12/28/2022] Open
Abstract
Different strategies have been used to mitigate greenhouse gas emissions from domesticated ruminants, including the removal of protozoa (defaunation). The objective of the present work was to analyze the potential of different N-oxide-containing aromatic heterocycles with known antiprotozoal activity as rumen-gas-abating agents. Nineteen pure compounds, belonging to seven different N-oxide chemotypes from our chemo-library were studied together with monensin in an in vitro rumen simulation assay. Fermentation profiles, i.e., gas production, pH, and short carboxylic acid concentrations, were compared to an untreated control at 96 h post inoculation. In our study, we investigated whole-ruminal fluid, with and without compound treatments, by NMR spectroscopy focusing on concentrations of the metabolites acetate, propionate, butyrate, and lactate. From data analysis, three of the compounds from different N-oxide chemotypes, including quinoxaline dioxide, benzofuroxan, and methylfuroxan, were able to diminish the production of gases such as monensin with similar gas production lag times for each of them. Additionally, unlike monensin, one methylfuroxan did not decrease the rumen pH during the analyzed incubation time, shifting rumen fermentation to increase the molar concentrations of propionate and butyrate. These facts suggest interesting alternatives as feed supplements to control gas emissions from dairy ruminants.
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15
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Liu Q, Lei Z, Wu Q, Awais I, Shabbir MAB, Ahmed S, Fatima Z, Wang X, Pan Y, Xie S, Yuan Z. The Reproductive Toxicity of Mequindox in a Two-Generation Study in Wistar Rats. Front Pharmacol 2018; 9:870. [PMID: 30186160 PMCID: PMC6113877 DOI: 10.3389/fphar.2018.00870] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2018] [Accepted: 07/18/2018] [Indexed: 01/16/2023] Open
Abstract
Mequindox (MEQ), belonging to quinoxaline-di-N-oxides (QdNOs), has been extensively used as a synthetic antibacterial agent. To evaluate the reproductive toxicity of MEQ, different concentrations of MEQ were administered to Wistar rats by feeding diets containing 0, 25, 55, 110, and 275 mg/kg, respectively. Each group consisting of 25 males and 25 females (F0) was treated with different concentrations of MEQ for 12-week period time, prior to mating and during mating, gestation, parturition and lactation. At weaning, 25 males and 25 females of F1 generation weanlings per group were randomly selected as parents for the F2 generation. Selected F1 weanlings were exposed to the same diet and treatment as their parents. The number of live litter and indexes of mating and fertility were significantly decreased in the F1 and F2 generation at 110 and 275 mg/kg groups. Significant decrease in pup vitality during lactation was observed in F1 litter at 275 mg/kg group, in F2 litter at 55, 110, and 275 mg/kg groups. A downward trend in the body weights was observed in F1 pups at 55, 110, and 275 mg/kg MEQ groups, and in F2 pups at 110 and 275 mg/kg MEQ groups. The changed levels of ALT, AST, CREA, BUN, UA, Na, and K were noted in the serum of rats. The histopathologic examination showed that MEQ induced toxicity in the liver, kidney, adrenal, uterus and testis. The no-observed-adverse-effect level (NOAEL) for reproduction toxicity of MEQ was 25 mg/kg diet. The malformations and severe maternal toxicity of MEQ caused adverse effects on the conceptus and embryo, which result in fetal malformations and fetal deaths. In summary, the present study showed that MEQ induced maternal, embryo and reproductive toxicities as well as teratogenicity in rats.
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Affiliation(s)
- Qianying Liu
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, China
| | - Zhixin Lei
- MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, China
| | - Qin Wu
- MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, China
| | - Ihsan Awais
- MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, China
| | - Muhammad A B Shabbir
- MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, China
| | - Saeed Ahmed
- MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, China
| | - Zainab Fatima
- MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, China
| | - Xu Wang
- MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, China
| | - Yuanhu Pan
- MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, China
| | - Shuyu Xie
- MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, China
| | - Zonghui Yuan
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, China.,MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, China.,Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, China
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16
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Hamama WS, Waly SM, Said SB, Zoorob HH. Annulation ofo-Aminoquinoxaline-1,4-dioxidenitrile with Ketonic Compounds Under Friedländer-type Cyclocondensation and its Biological Evaluation. J Heterocycl Chem 2018. [DOI: 10.1002/jhet.3182] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Wafaa S. Hamama
- Chemistry Department, Faculty of Science; Mansoura University; Mansoura 35516 Egypt
| | - Sara M. Waly
- Chemistry Department, Faculty of Science; Damietta University; Damietta Egypt
| | - Samy B. Said
- Chemistry Department, Faculty of Science; Damietta University; Damietta Egypt
| | - Hanafi H. Zoorob
- Chemistry Department, Faculty of Science; Mansoura University; Mansoura 35516 Egypt
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17
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Liu Q, Lei Z, Wu Q, Huang D, Xie S, Wang X, Pan Y, Yuan Z. Mequindox Induced Genotoxicity and Carcinogenicity in Mice. Front Pharmacol 2018; 9:361. [PMID: 29692735 PMCID: PMC5902691 DOI: 10.3389/fphar.2018.00361] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Accepted: 03/27/2018] [Indexed: 12/16/2022] Open
Abstract
Mequindox (MEQ), acting as an inhibitor of deoxyribonucleic acid (DNA) synthesis, is a synthetic heterocyclic N-oxides. To investigate the potential carcinogenicity of MEQ, four groups of Kun-Ming (KM) mice (50 mice/sex/group) were fed with diets containing MEQ (0, 25, 55, and 110 mg/kg) for one and a half years. The result showed adverse effects on body weights, feed consumption, hematology, serum chemistry, organ weights, relative organ weights, and incidence of tumors during most of the study period. Treatment-related changes in hematology, serum chemistry, relative weights and histopathological examinations revealed that the hematological system, liver, kidneys, and adrenal glands, as well as the developmental and reproductive system, were the main targets after MEQ administration. Additionally, MEQ significantly increased the frequency of micronucleated normochromatic erythrocytes in bone marrow cells of mice. Furthermore, MEQ increased the incidence of tumors, including mammary fibroadenoma, breast cancer, corticosuprarenaloma, haemangiomas, hepatocarcinoma, and pulmonary adenoma. Interestingly, the higher incidence of tumors was noted in M25 mg/kg group, the lowest dietary concentration tested, which was equivalent to approximately 2.25 and 1.72 mg/kg b.w./day in females and males, respectively. It was assumed that the lower toxicity might be a reason for its higher tumor incidence in M25 mg/kg group. This finding suggests a potential relationships among the dose, general toxicity and carcinogenicity in vivo, and further study is required to reveal this relationship. In conclusion, the present study demonstrates that MEQ is a genotoxic carcinogen in KM mice.
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Affiliation(s)
- Qianying Liu
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Preventive Veterinary Medicine in Hubei Province, Huazhong Agricultural University, Wuhan, China
| | - Zhixin Lei
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, China
| | - Qin Wu
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, China
| | - Deyu Huang
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, China
| | - Shuyu Xie
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, China.,MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, China
| | - Xu Wang
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, China.,MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, China
| | - Yuanhu Pan
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, China.,MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, China
| | - Zonghui Yuan
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, China.,Key Laboratory of Preventive Veterinary Medicine in Hubei Province, Huazhong Agricultural University, Wuhan, China.,MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, China.,Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, China
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18
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Liu H, Ren C, Han D, Huang H, Zou R, Zhang H, Xu Y, Gong X, Zhang X, Li Y. UPLC-MS/MS Method for Simultaneous Determination of Three Major Metabolites of Mequindox in Holothurian. JOURNAL OF ANALYTICAL METHODS IN CHEMISTRY 2018; 2018:2768047. [PMID: 29805832 PMCID: PMC5902003 DOI: 10.1155/2018/2768047] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Accepted: 01/10/2018] [Indexed: 06/08/2023]
Abstract
This study developed an ultraperformance liquid chromatography tandem mass spectrometry (UPLC-MS/MS) method for the detection of three major metabolites of mequindox, including 3-methyl-quinoxaline-2-carboxylic acid, 1-desoxymequindox, and 1,4-bisdesoxymequindox (MQCA, 1-DMEQ, and BDMEQ), in holothurian. Target analytes were simplified with ultrasound-assisted acidolysis extracted without complicated enzymolysis steps. After that, each sample was centrifuged and purified by an Oasis MAX cartridge. Then, the processed samples were separated and monitored by UPLC-MS/MS. This developed method has been validated according to FDA criteria. At fortified levels of 2, 10, and 20 μg/kg, recoveries ranged from 82.5% to 93.5% with the intraday RSD less than 7.27% and interday RSD less than 11.8%. The limit of detection (LOD) of all the three metabolites ranged from 0.21 to 0.48 μg/kg, while the limit of quantification (LOQ) ranged from 0.79 to 1.59 μg/kg. On application to commercial samples, 14 of 20 samples were detected positive for the three target analytes, with positive rate at 70 percentage. The result indicated that this method was specific, sensitive, and suitable for the quantification and conformation of the three major metabolites of MEQ in holothurian.
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Affiliation(s)
- Huihui Liu
- Shandong Marine Resource and Environment Research Institute, Laboratory of Restoration for Marine Ecology, Yantai 264006, China
| | - Chuanbo Ren
- Shandong Marine Resource and Environment Research Institute, Laboratory of Restoration for Marine Ecology, Yantai 264006, China
| | - Dianfeng Han
- Shandong Marine Resource and Environment Research Institute, Laboratory of Restoration for Marine Ecology, Yantai 264006, China
| | - Hui Huang
- Shandong Marine Resource and Environment Research Institute, Laboratory of Restoration for Marine Ecology, Yantai 264006, China
| | - Rongjie Zou
- Shandong Marine Resource and Environment Research Institute, Laboratory of Restoration for Marine Ecology, Yantai 264006, China
| | - Huawei Zhang
- Shandong Marine Resource and Environment Research Institute, Laboratory of Restoration for Marine Ecology, Yantai 264006, China
| | - Yingjiang Xu
- Shandong Marine Resource and Environment Research Institute, Laboratory of Restoration for Marine Ecology, Yantai 264006, China
| | - Xianghong Gong
- Shandong Marine Resource and Environment Research Institute, Laboratory of Restoration for Marine Ecology, Yantai 264006, China
| | - Xiuzhen Zhang
- Shandong Marine Resource and Environment Research Institute, Laboratory of Restoration for Marine Ecology, Yantai 264006, China
| | - Yanshen Li
- College of Life Science, Yantai University, Yantai 264005, China
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19
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ROS-mediated oligomerization of VDAC2 is associated with quinocetone-induced apoptotic cell death. Toxicol In Vitro 2017; 47:195-206. [PMID: 29229420 DOI: 10.1016/j.tiv.2017.12.005] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2017] [Revised: 10/13/2017] [Accepted: 12/05/2017] [Indexed: 01/11/2023]
Abstract
Quinocetone (QCT) has been approved and widely used as an animal feed additive in China since 2003. However, investigations indicate that QCT shows potential toxicity both in vitro and in vivo. Although voltage dependent anion channel 1 (VDAC1) involved in regulating QCT-induced apoptotic cell death has been established, the role of voltage dependent anion channel 2 (VDAC2) in QCT-induced toxicity remains unclear. In this study, we showed that QCT-induced cell death was coupled to VDAC2 oligomerization. Moreover, VDAC inhibitor 4, 4'-diisothiocyano stilbene-2, 2'-disulfonic acid (DIDS) alleviated QCT-induced cell death and VDAC2 oligomerization. Meanwhile, overexpression VDAC2 aggravated QCT-induced VDAC2 oligomerization. In addition, caspase inhibitor Z-VAD-FMK and reactive oxidative species (ROS) scavenger N-acetyl-l-cysteine (NAC) apparently blocked QCT-induced cell death and VDAC2 oligomerization. Finally, overexpression N-terminal truncated VDAC2 attenuated QCT-induced VDAC2 oligomerization but had no influence on its localization to mitochondria when comparing to the full length of VDAC2. Taken together, our results reveal that ROS-mediated VDAC2 oligomerization is associated with QCT-induced apoptotic cell death. The N-terminal region of VDAC2 is required for QCT-induced VDAC2 oligomerization.
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20
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Critical role of p21 on olaquindox-induced mitochondrial apoptosis and S-phase arrest involves activation of PI3K/AKT and inhibition of Nrf2/HO-1pathway. Food Chem Toxicol 2017; 108:148-160. [DOI: 10.1016/j.fct.2017.07.054] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 07/17/2017] [Accepted: 07/26/2017] [Indexed: 11/18/2022]
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21
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Liu Q, Lei Z, Huang A, Lu Q, Wang X, Ahmed S, Awais I, Yuan Z. Mechanisms of the Testis Toxicity Induced by Chronic Exposure to Mequindox. Front Pharmacol 2017; 8:679. [PMID: 29018347 PMCID: PMC5622959 DOI: 10.3389/fphar.2017.00679] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2017] [Accepted: 09/11/2017] [Indexed: 12/12/2022] Open
Abstract
Mequindox (MEQ) is a synthetic antimicrobial agent widely used in China since the 1980s. Although the toxicity of MEQ is well recognized, its testis toxicity has not been adequately investigated. In the present study, we provide evidence that MEQ triggers oxidative stress, mitochondrion dysfunction and spermatogenesis deficiency in mice after exposure to MEQ (0, 25, 55, and 110 mg/kg in the diet) for up to 18 months. The genotoxicity and adrenal toxicity may contribute to sperm abnormalities caused by MEQ. Moreover, using LC/MS-IT-TOF analysis, two metabolites, 3-methyl-2-(1-hydroxyethyl) quinoxaline-N4-monoxide (M4) and 3-methyl-2-(1-hydroxyethyl) quinoxaline-N1-monoxide (M8), were detected in the serum of mice, which directly confirms the relationship between the N→O group reduction metabolism of MEQ and oxidative stress. Interestingly, only M4 was detected in the testes, suggesting that the higher reproductive toxicity of M4 than M8 might be due to the increased stability of M4-radical (M4-R) compared to M8-radical (M8-R). Furthermore, the expression of the blood-testis barrier (BTB)-associated junctions such as tight junctions, gap junctions and basal ectoplasmic specializations were also examined. The present study demonstrated for the first time the role of the M4 in testis toxicity, and illustrated that the oxidative stress, mitochondrion dysfunction and interference in spermatogenesis, as well as the altered expression of BTB related junctions, were involved in the reproductive toxicity mediated by MEQ in vivo.
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Affiliation(s)
- Qianying Liu
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues, Wuhan, China
| | - Zhixin Lei
- MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, China
| | - Anxiong Huang
- MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, China
| | - Qirong Lu
- Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, China
| | - Xu Wang
- Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, China
| | - Saeed Ahmed
- MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, China
| | - Ihsan Awais
- Department of Biosciences, COMSATS Institute of Information Technology, Sahiwal, Pakistan
| | - Zonghui Yuan
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues, Wuhan, China.,MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, China.,Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, China
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22
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Liu Q, Lei Z, Dai M, Wang X, Yuan Z. Toxic metabolites, Sertoli cells and Y chromosome related genes are potentially linked to the reproductive toxicity induced by mequindox. Oncotarget 2017; 8:87512-87528. [PMID: 29152098 PMCID: PMC5675650 DOI: 10.18632/oncotarget.20916] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/02/2017] [Accepted: 08/28/2017] [Indexed: 11/25/2022] Open
Abstract
Mequindox (MEQ) is a relatively new synthetic antibacterial agent widely applied in China since the 1980s. However, its reproductive toxicity has not been adequately performed. In the present study, four groups of male Kunming mice (10 mice/group) were fed diets containing MEQ (0, 25, 55 and 110 mg/kg in the diet) for up to 18 months. The results show that M4 could pass through the blood-testis barrier (BTB), and demonstrate that Sertoli cells (SCs) are the main toxic target for MEQ to induce spermatogenesis deficiency. Furthermore, adrenal toxicity, adverse effects on the hypothalamic-pituitary-testicular axis (HPTA) and Leydig cells, as well as the expression of genes related to steroid biosynthesis and cholesterol transport, were responsible for the alterations in sex hormones in the serum of male mice after exposure to MEQ. Additionally, the changed levels of Y chromosome microdeletion related genes, such as DDX3Y, HSF2, Sly and Ssty2 in the testis might be a mechanism for the inhibition of spermatogenesis induced by MEQ. The present study illustrates for the first time the toxic metabolites of MEQ in testis of mice, and suggests that SCs, sex hormones and Y chromosome microdeletion genes are involved in reproductive toxicity mediated by MEQ in vivo.
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Affiliation(s)
- Qianying Liu
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Zhixin Lei
- MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Menghong Dai
- MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Xu Wang
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, Hubei, China
| | - Zonghui Yuan
- National Reference Laboratory of Veterinary Drug Residues (HZAU) and MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, Hubei, China.,MOA Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, Hubei, China.,Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, Hubei, China
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Li D, Zhao K, Yang X, Xiao X, Tang S. TCS2 Increases Olaquindox-Induced Apoptosis by Upregulation of ROS Production and Downregulation of Autophagy in HEK293 Cells. Molecules 2017; 22:E595. [PMID: 28387735 PMCID: PMC6154664 DOI: 10.3390/molecules22040595] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/13/2017] [Revised: 03/31/2017] [Accepted: 04/06/2017] [Indexed: 11/16/2022] Open
Abstract
Olaquindox, a feed additive, has drawn public attention due to its potential mutagenicity, genotoxicity, hepatoxicity and nephrotoxicity. The purpose of this study was to investigate the role of tuberous sclerosis complex (TSC2) pathways in olaquindox-induced autophagy in human embryonic kidney 293 (HEK293) cells. The results revealed that olaquindox treatment reduced the cell viability of HEK293 cells and downregulated the expression of TSC2 in a dose- and time-dependent manner. Meanwhile, olaquindox treatment markedly induced the production of reactive oxygen species (ROS), cascaded to autophagy, oxidative stress, and apoptotic cell death, which was effectively eliminated by the antioxidant N-acetylcysteine (NAC). Furthermore, overexpression of TSC2 attenuated olaquindox-induced autophagy in contrast to inducing the production of ROS, oxidative stress and apoptosis. Consistently, knockdown of TSC2 upregulated autophagy, and decreased olaquindox-induced cell apoptosis. In conclusion, our findings indicate that TSC2 partly participates in olaquindox-induced autophagy, oxidative stress and apoptosis, and demonstrate that TSC2 has a negative regulation role in olaquindox-induced autophagy in HEK293 cells.
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Affiliation(s)
- Daowen Li
- College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Haidian District, Beijing 100193, China.
| | - Kena Zhao
- College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Haidian District, Beijing 100193, China.
| | - Xiayun Yang
- College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Haidian District, Beijing 100193, China.
| | - Xilong Xiao
- College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Haidian District, Beijing 100193, China.
| | - Shusheng Tang
- College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Haidian District, Beijing 100193, China.
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Liu L, Peng J, Xie Z, Song S, Kuang H, Xu C. Development of an icELISA and Immunochromatographic Assay for Methyl-3-Quinoxaline-2-Carboxylic Acid Residues in Fish. FOOD ANAL METHOD 2017. [DOI: 10.1007/s12161-017-0888-0] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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25
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Yang X, Tang S, Dai C, Li D, Zhang S, Deng S, Zhou Y, Xiao X. Quinocetone induces mitochondrial apoptosis in HepG2 cells through ROS-dependent promotion of VDAC1 oligomerization and suppression of Wnt1/β-catenin signaling pathway. Food Chem Toxicol 2017; 105:161-176. [PMID: 28343033 DOI: 10.1016/j.fct.2017.03.039] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2017] [Revised: 03/12/2017] [Accepted: 03/22/2017] [Indexed: 12/26/2022]
Abstract
Quinocetone (QCT) has been used as an animal feed additive in China since 2003. However, investigations indicate that QCT has potential toxicity due to the fact that it shows cytotoxicity, genotoxicity, hepatotoxicity, nephrotoxicity and immunotoxicity in vitro and animal models. Although QCT-induced mitochondrial apoptosis has been established, the molecular mechanism remains unclear. This study was aimed to investigate the role of voltage-dependent anion channel 1 (VDAC1) oligomerization and Wnt/β-catenin pathway in QCT-induced mitochondrial apoptosis. The results showed VDAC inhibitor 4, 4-diisothiocyano stilbene-2, 2-disulfonic acid (DIDS) partly compromised QCT-induced cell viability decrease (from 34.1% to 68.5%) and mitochondrial apoptosis accompanied by abating VDAC1 oligomerization, cytochrome c (Cyt c) release and the expression levels of cleaved caspase-9, -3 and poly (ADP-ribose) polymerase (PARP). Meanwhile, overexpression VDAC1 exacerbated QCT-induced VDAC1 oligomerization and Cyt c release. In addition, lithium chloride (LiCl), an activator of Wnt/β-catenin pathway, markedly attenuated QCT-induced mitochondrial apoptosis by partly restoring the expression levels of Wnt1 and β-catenin. Finally, reactive oxygen species (ROS) scavenger N-acetyl-l-cysteine (NAC) obviously blocked QCT-induced VDAC1 oligomerization and the inhibition of Wnt1/β-catenin pathway. Taken together, our results reveal that QCT induces mitochondrial apoptosis by ROS-dependent promotion of VDAC1 oligomerization and suppression of Wnt1/β-catenin pathway.
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Affiliation(s)
- Xiayun Yang
- Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Beijing, Haidian District 100193, China
| | - Shusheng Tang
- Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Beijing, Haidian District 100193, China
| | - Chongshan Dai
- Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Beijing, Haidian District 100193, China
| | - Daowen Li
- Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Beijing, Haidian District 100193, China
| | - Shen Zhang
- Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Beijing, Haidian District 100193, China
| | - Sijun Deng
- Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Beijing, Haidian District 100193, China
| | - Yan Zhou
- Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Beijing, Haidian District 100193, China
| | - Xilong Xiao
- Department of Pharmacology and Toxicology, College of Veterinary Medicine, China Agricultural University, Yuanmingyuan West Road No. 2, Beijing, Haidian District 100193, China.
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26
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Toxic metabolites, MAPK and Nrf2/Keap1 signaling pathways involved in oxidative toxicity in mice liver after chronic exposure to Mequindox. Sci Rep 2017; 7:41854. [PMID: 28157180 PMCID: PMC5291092 DOI: 10.1038/srep41854] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2016] [Accepted: 12/30/2016] [Indexed: 12/21/2022] Open
Abstract
Mequindox (MEQ) is a synthetic antimicrobial agent of quinoxaline-1,4-dioxide group (QdNOs). The liver is regarded as the toxicity target of QdNOs, and the role of N → O group-associated various toxicities mediated by QdNOs is well recognized. However, the mechanism underlying the in vivo effects of MEQ on the liver, and whether the metabolic pathway of MEQ is altered in response to the pathophysiological conditions still remain unclear. We now provide evidence that MEQ triggers oxidative damage in the liver. Moreover, using LC/MS-ITTOF analysis, two metabolites of MEQ were detected in the liver, which directly confirms the potential connection between N → O group reduction metabolism of MEQ and liver toxicity. The gender difference in MEQ-induced oxidative stress might be due to adrenal toxicity and the generation of M4 (2-isoethanol 1-desoxymequindox). Furthermore, up-regulation of the MAPK and Nrf2-Keap1 family and phase II detoxifying enzymes (HO-1, GCLC and NQO1) were also observed. The present study demonstrated for the first time the protein peroxidation and a proposal metabolic pathway after chronic exposure of MEQ, and illustrated that the MAPK, Nrf2-Keap1 and NF-кB signaling pathways, as well as the altered metabolism of MEQ, were involved in oxidative toxicity mediated by MEQ in vivo.
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Alagawany M, Farag MR, Abd El-Hac ME, Casalino E, Tufarelli V, Sayab M, Dhama K. Assessment of Cyadox Effects on the Antioxidant Defense System and Hemolysis of Isolated Rabbit Erythrocytes. INT J PHARMACOL 2017. [DOI: 10.3923/ijp.2017.183.190] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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28
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GADD45a Regulates Olaquindox-Induced DNA Damage and S-Phase Arrest in Human Hepatoma G2 Cells via JNK/p38 Pathways. Molecules 2017; 22:molecules22010124. [PMID: 28098804 PMCID: PMC6155949 DOI: 10.3390/molecules22010124] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2016] [Revised: 12/28/2016] [Accepted: 01/09/2017] [Indexed: 01/09/2023] Open
Abstract
Olaquindox, a quinoxaline 1,4-dioxide derivative, is widely used as a feed additive in many countries. The potential genotoxicity of olaquindox, hence, is of concern. However, the proper mechanism of toxicity was unclear. The aim of the present study was to investigate the effect of growth arrest and DNA damage 45 alpha (GADD45a) on olaquindox-induced DNA damage and cell cycle arrest in HepG2 cells. The results showed that olaquindox could induce reactive oxygen species (ROS)-mediated DNA damage and S-phase arrest, where increases of GADD45a, cyclin A, Cdk 2, p21 and p53 protein expression, decrease of cyclin D1 and the activation of phosphorylation-c-Jun N-terminal kinases (p-JNK), phosphorylation-p38 (p-p38) and phosphorylation-extracellular signal-regulated kinases (p-ERK) were involved. However, GADD45a knockdown cells treated with olaquindox could significantly decrease cell viability, exacerbate DNA damage and increase S-phase arrest, associated with the marked activation of p-JNK, p-p38, but not p-ERK. Furthermore, SP600125 and SB203580 aggravated olaquindox-induced DNA damage and S-phase arrest, suppressed the expression of GADD45a. Taken together, these findings revealed that GADD45a played a protective role in olaquindox treatment and JNK/p38 pathways may partly contribute to GADD45a regulated olaquindox-induced DNA damage and S-phase arrest. Our findings increase the understanding on the molecular mechanisms of olaquindox.
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