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Ahmadi M, Shahbahrami R, Khajeh F, Khodaeivandi S, Kakavandi E, Raziabad RH, Ghanati K. Aflatoxin B1 and viruses' combined pathogenesis: A mini systematics review of invitro and invivo studies. Acta Histochem 2024; 126:152116. [PMID: 38101290 DOI: 10.1016/j.acthis.2023.152116] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Revised: 11/08/2023] [Accepted: 11/13/2023] [Indexed: 12/17/2023]
Abstract
INTRODUCTION The combined pathogenesis of Aflatoxin B1 (AFB1) and several viruses such as HBV, EBV and influenza virus have been investigated yet the molecular mechanism of their interaction and possible synergistic effects is not fully understood. OBJECTIVES The aim of the current systematic review was to review in-vitro and in-vivo studies investigating the combined pathogenesis of aflatoxins and viruses. METHODS This systematic review was performed according to the Preferred Reporting Items for Systematic Reviews and Meta-analyses (PRISMA) guidelines. PECO (Population, Exposure, Comparator, and Outcome) criteria for invitro and invivo studies were used to evaluate the eligibility of the studies for systematic review. RESULTS 21 studies were eligible for qualitative analysis based on the inclusion criteria. Of all the included studies, 9 (42.9 %) were invivo, 7 (33.3 %) were invitro-invivo and 5(23.8) articles conducted only invitro assay. Furthermore 14 (66.6 %) article explored hepatitis B virus (HBV) combination with AFB1, 4 (19 %) studied influenza A virus (SIV), 2 (9.7 %) were about Epstein-Barr virus (EBV) and only 1 (4.7 %) included hepatitis C virus (HCV). CONCLUSION The limited collected evidence suggests that AFB1 enhanced EBV and influenza virus pathogenesis. AFB1 also operated as a cofactor for HBV and EBV-mediated carcinogenesis. On the other hand HBV and HCV also induced AFB-1 carcinogenesis. Due to the limited amount of included studies and the inconsistency of their results further studies especially on HBV and SIV are essential for better understanding of their combined mechanisms.
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Affiliation(s)
- Mehdi Ahmadi
- Student Research Committee, (Department and Faculty of Nutrition Sciences and Food Technology), Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Ramin Shahbahrami
- Department of Medical Virology, Tehran University of Medical Sciences, Tehran, Iran
| | - Fatemeh Khajeh
- Department of Environmental Health Engineering, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
| | - Sepideh Khodaeivandi
- Department of Food Science and Technology, Afagh Higher Education institute, Urmia, Iran
| | - Ehsan Kakavandi
- Department of Virology, School of Public Health, Tehran University of Medical Sciences, Tehran, Iran
| | - Reza Hazrati Raziabad
- Student Research Committee, (Department and Faculty of Nutrition Sciences and Food Technology), Shahid Beheshti University of Medical Sciences, Tehran, Iran
| | - Kiandokht Ghanati
- Student Research Committee, (Department and Faculty of Nutrition Sciences and Food Technology), Shahid Beheshti University of Medical Sciences, Tehran, Iran.
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Guo C, Liu Y, Wang Y, Wang Q, Huo S, Zhang X, Cao Z, Song M, Li Y. PINK1/Parkin-mediated mitophagy is activated to protect against AFB 1-induced immunosuppression in mice spleen. Toxicol Lett 2022; 366:33-44. [PMID: 35810998 DOI: 10.1016/j.toxlet.2022.07.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/23/2022] [Revised: 06/16/2022] [Accepted: 07/05/2022] [Indexed: 12/26/2022]
Abstract
Aflatoxin B1 (AFB1) can cause mitochondrial malfunction and immunosuppression in spleen. Mitochondrial damage can lead to oxidative stress and aggravate immune cell dysfunction. Phosphatase and tensin homolog (PTEN)-induced putative kinase1 (PINK1)/ E3 ubiquitin ligase PARK2 (Parkin)-mediated mitophagy can scavenge damaged mitochondria and alleviate oxidative stress to maintain cellular homeostasis. However, the role of PINK1/Parkin-mediated mitophagy in AFB1-induced immunosuppression in spleen is unclear. In this study, sixty male mice were sensibilized orally with AFB1 at different concentrations [0, 0.5, 0.75, and 1 mg/kg body weight (BW)] for 28 days, and AFB1 caused splenic structure injury and immunosuppression, also led to upregulation of PINK1/Parkin-mediated mitophagy in a dose-dependent manner. Subsequently, thirty male WT C57BL/6 N mice and thirty male Parkin knockout (Parkin-/-) C57BL/6 N mice were sensibilized orally with AFB1 at 0 or 1 mg/kg BW for 28 days, and Parkin-/- inhibited mitophagy and further aggravated AFB1-induced splenic structure injury, immunosuppression, mitochondrial damage and oxidative stress. Collectively, these results indicate that AFB1 exposure activates PINK1/Parkin-mediated mitophagy, which protects against immunosuppression in spleen.
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Affiliation(s)
- Chen Guo
- Key Laboratory of the Provincial Education, Department of Heilongjiang for Common Animal Disease Prevention and Treatment, College of Veterinary Medicine, Northeast Agricultural. University, Harbin 150030, China
| | - Yanfen Liu
- Liaoning Agricultural Technical College, Yingkou 115009, China
| | - Yuping Wang
- Key Laboratory of the Provincial Education, Department of Heilongjiang for Common Animal Disease Prevention and Treatment, College of Veterinary Medicine, Northeast Agricultural. University, Harbin 150030, China
| | - Qi Wang
- Key Laboratory of the Provincial Education, Department of Heilongjiang for Common Animal Disease Prevention and Treatment, College of Veterinary Medicine, Northeast Agricultural. University, Harbin 150030, China
| | - Siming Huo
- Key Laboratory of the Provincial Education, Department of Heilongjiang for Common Animal Disease Prevention and Treatment, College of Veterinary Medicine, Northeast Agricultural. University, Harbin 150030, China
| | - Xuliang Zhang
- Key Laboratory of the Provincial Education, Department of Heilongjiang for Common Animal Disease Prevention and Treatment, College of Veterinary Medicine, Northeast Agricultural. University, Harbin 150030, China
| | - Zheng Cao
- Key Laboratory of the Provincial Education, Department of Heilongjiang for Common Animal Disease Prevention and Treatment, College of Veterinary Medicine, Northeast Agricultural. University, Harbin 150030, China
| | - Miao Song
- Key Laboratory of the Provincial Education, Department of Heilongjiang for Common Animal Disease Prevention and Treatment, College of Veterinary Medicine, Northeast Agricultural. University, Harbin 150030, China
| | - Yanfei Li
- Key Laboratory of the Provincial Education, Department of Heilongjiang for Common Animal Disease Prevention and Treatment, College of Veterinary Medicine, Northeast Agricultural. University, Harbin 150030, China.
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Garai E, Risa A, Varga E, Cserháti M, Kriszt B, Urbányi B, Csenki Z. Evaluation of the Multimycotoxin-Degrading Efficiency of Rhodococcus erythropolis NI1 Strain with the Three-Step Zebrafish Microinjection Method. Int J Mol Sci 2021; 22:ijms22020724. [PMID: 33450918 PMCID: PMC7828439 DOI: 10.3390/ijms22020724] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2020] [Revised: 01/08/2021] [Accepted: 01/11/2021] [Indexed: 12/13/2022] Open
Abstract
The multimycotoxin-degrading efficiency of the Rhodococcus erythropolis NI1 strain was investigated with a previously developed three-step method. NI1 bacterial metabolites, single and combined mycotoxins and their NI1 degradation products, were injected into one cell stage zebrafish embryos in the same doses. Toxic and interaction effects were supplemented with UHPLC-MS/MS measurement of toxin concentrations. Results showed that the NI1 strain was able to degrade mycotoxins and their mixtures in different proportions, where a higher ratio of mycotoxins were reduced in combination than single ones. The NI1 strain reduced the toxic effects of mycotoxins and mixtures, except for the AFB1+T-2 mixture. Degradation products of the AFB1+T-2 mixture by the NI1 strain were more toxic than the initial AFB1+T-2 mixture, while the analytical results showed very high degradation, which means that the NI1 strain degraded this mixture to toxic degradation products. The NI1 strain was able to detoxify the AFB1, ZEN, T-2 toxins and mixtures (except for AFB1+T-2 mixture) during the degradation experiments, which means that the NI1 strain degraded these to non-toxic degradation products. The results demonstrate that single exposures of mycotoxins were very toxic. The combined exposure of mycotoxins had synergistic effects, except for ZEN+T-2 and AFB1+ZEN +T-2, whose mixtures had very strong antagonistic effects.
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Affiliation(s)
- Edina Garai
- Department of Aquaculture, Institute for Conservation of Natural Resources, Faculty of Agricultural and Environmental Sciences, Szent István University, H-2100 Gödöllő, Hungary; (E.G.); (B.U.)
- Institute of Aquaculture and Environmental Safety, Hungarian University of Agriculture and Life Sciences, H-2100 Gödöllő, Hungary; (A.R.); (M.C.); (B.K.)
| | - Anita Risa
- Institute of Aquaculture and Environmental Safety, Hungarian University of Agriculture and Life Sciences, H-2100 Gödöllő, Hungary; (A.R.); (M.C.); (B.K.)
- Department of Environmental Safety and Ecotoxicology, Institute for Conservation of Natural Resources, Faculty of Agricultural and Environmental Sciences, Szent István University, H-2100 Gödöllő, Hungary
| | - Emese Varga
- Department of Applied Chemistry, Faculty of Food Science, Szent István University, H-1118 Budapest, Hungary;
| | - Mátyás Cserháti
- Institute of Aquaculture and Environmental Safety, Hungarian University of Agriculture and Life Sciences, H-2100 Gödöllő, Hungary; (A.R.); (M.C.); (B.K.)
- Department of Environmental Safety and Ecotoxicology, Institute for Conservation of Natural Resources, Faculty of Agricultural and Environmental Sciences, Szent István University, H-2100 Gödöllő, Hungary
| | - Balázs Kriszt
- Institute of Aquaculture and Environmental Safety, Hungarian University of Agriculture and Life Sciences, H-2100 Gödöllő, Hungary; (A.R.); (M.C.); (B.K.)
- Department of Environmental Safety and Ecotoxicology, Institute for Conservation of Natural Resources, Faculty of Agricultural and Environmental Sciences, Szent István University, H-2100 Gödöllő, Hungary
| | - Béla Urbányi
- Department of Aquaculture, Institute for Conservation of Natural Resources, Faculty of Agricultural and Environmental Sciences, Szent István University, H-2100 Gödöllő, Hungary; (E.G.); (B.U.)
- Institute of Aquaculture and Environmental Safety, Hungarian University of Agriculture and Life Sciences, H-2100 Gödöllő, Hungary; (A.R.); (M.C.); (B.K.)
| | - Zsolt Csenki
- Department of Aquaculture, Institute for Conservation of Natural Resources, Faculty of Agricultural and Environmental Sciences, Szent István University, H-2100 Gödöllő, Hungary; (E.G.); (B.U.)
- Institute of Aquaculture and Environmental Safety, Hungarian University of Agriculture and Life Sciences, H-2100 Gödöllő, Hungary; (A.R.); (M.C.); (B.K.)
- Correspondence:
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Huang B, Chen Q, Wang L, Gao X, Zhu W, Mu P, Deng Y. Aflatoxin B1 Induces Neurotoxicity through Reactive Oxygen Species Generation, DNA Damage, Apoptosis, and S-Phase Cell Cycle Arrest. Int J Mol Sci 2020; 21:ijms21186517. [PMID: 32899983 PMCID: PMC7554769 DOI: 10.3390/ijms21186517] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2020] [Revised: 09/03/2020] [Accepted: 09/04/2020] [Indexed: 12/21/2022] Open
Abstract
Aflatoxin B1 (AFB1) is a mycotoxin widely distributed in a variety of food commodities and exhibits strong toxicity toward multiple tissues and organs. However, little is known about its neurotoxicity and the associated mechanism. In this study, we observed that brain integrity was markedly damaged in mice after intragastric administration of AFB1 (300 μg/kg/day for 30 days). The toxicity of AFB1 on neuronal cells and the underlying mechanisms were then investigated in the neuroblastoma cell line IMR-32. A cell viability assay showed that the IC50 values of AFB1 on IMR-32 cells were 6.18 μg/mL and 5.87 μg/mL after treatment for 24 h and 48 h, respectively. ROS levels in IMR-32 cells increased significantly in a time- and AFB1 concentration-dependent manner, which was associated with the upregulation of NOX2, and downregulation of OXR1, SOD1, and SOD2. Substantial DNA damage associated with the downregulation of PARP1, BRCA2, and RAD51 was also observed. Furthermore, AFB1 significantly induced S-phase arrest, which is associated with the upregulation of CDKN1A, CDKN2C, and CDKN2D. Finally, AFB1 induced apoptosis involving CASP3 and BAX. Taken together, AFB1 manifests a wide range of cytotoxicity on neuronal cells including ROS accumulation, DNA damage, S-phase arrest, and apoptosis-all of which are key factors for understanding the neurotoxicology of AFB1.
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Affiliation(s)
- Boyan Huang
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Tianhe District, Guangzhou 510642, China; (B.H.); (Q.C.); (L.W.); (X.G.); (W.Z.)
- Key Laboratory of Zoonosis of Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou 510642, China
| | - Qingmei Chen
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Tianhe District, Guangzhou 510642, China; (B.H.); (Q.C.); (L.W.); (X.G.); (W.Z.)
- Key Laboratory of Zoonosis of Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou 510642, China
| | - Lingling Wang
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Tianhe District, Guangzhou 510642, China; (B.H.); (Q.C.); (L.W.); (X.G.); (W.Z.)
- Key Laboratory of Zoonosis of Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou 510642, China
| | - Xiaojuan Gao
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Tianhe District, Guangzhou 510642, China; (B.H.); (Q.C.); (L.W.); (X.G.); (W.Z.)
- Key Laboratory of Zoonosis of Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou 510642, China
| | - Wenya Zhu
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Tianhe District, Guangzhou 510642, China; (B.H.); (Q.C.); (L.W.); (X.G.); (W.Z.)
- Key Laboratory of Zoonosis of Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou 510642, China
| | - Peiqiang Mu
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Tianhe District, Guangzhou 510642, China; (B.H.); (Q.C.); (L.W.); (X.G.); (W.Z.)
- Key Laboratory of Zoonosis of Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou 510642, China
- Correspondence: (P.M.); (Y.D.); Tel./Fax: +86-20-3860-4967 (Y.D.)
| | - Yiqun Deng
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Tianhe District, Guangzhou 510642, China; (B.H.); (Q.C.); (L.W.); (X.G.); (W.Z.)
- Key Laboratory of Zoonosis of Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou 510642, China
- Correspondence: (P.M.); (Y.D.); Tel./Fax: +86-20-3860-4967 (Y.D.)
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Huang B, Mu P, Chen X, Tang S, Ye W, Zhu W, Deng Y. Aflatoxin B 1 induces S phase arrest by upregulating the expression of p21 via MYC, PLK1 and PLD1. Biochem Pharmacol 2019; 166:108-119. [PMID: 31075264 DOI: 10.1016/j.bcp.2019.05.008] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2019] [Accepted: 05/06/2019] [Indexed: 02/06/2023]
Abstract
Aflatoxin B1 (AFB1), a member of the aflatoxin family, is a common contaminant in foods and feeds, and AFB1 exposure is associated with various clinical conditions. Thus far, research on the toxicity of AFB1 has mainly focused on its induction of liver cancer, but little research has been reported on renal toxicity, especially with regards to the underlying molecular mechanisms. In this study, we found that AFB1 treatment significantly induced kidney damage and reduced kidney weight. The human kidney cell line HEK293T was used to further study the molecular mechanism of the toxicity of AFB1 to kidney cells. We found that AFB1 significantly and dose-dependently induced S phase arrest and upregulated p21 mRNA and protein expression. Upstream of p21, three negative regulators, PLK1, MYC, and PLD1, were significantly downregulated under AFB1 treatment. Consistently, p21 was upregulated, and PLK1, MYC and PLD1 were downregulated in mouse kidney after AFB1 treatment. Interestingly, AFB1 also decreased the physical interaction between PLK1 and MYC and weakened the stability of the MYC protein. Importantly, overexpression of PLK1, MYC and PLD1 significantly blocked the upregulation of p21 and attenuated the S phase arrest caused by AFB1. In summary, AFB1 markedly induces kidney damage and strongly induces S phase arrest by upregulating the expression of p21 via PLK1, PLD1 and MYC, which represents a noval mechanism of the renal toxicity of AFB1.
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Affiliation(s)
- Boyan Huang
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Tianhe District, Guangzhou, Guangdong 510642, PR China; Key Laboratory of Zoonosis of Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou, Guangdong 510642, PR China
| | - Peiqiang Mu
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Tianhe District, Guangzhou, Guangdong 510642, PR China; Key Laboratory of Zoonosis of Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou, Guangdong 510642, PR China
| | - Xiaoxuan Chen
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Tianhe District, Guangzhou, Guangdong 510642, PR China; Key Laboratory of Zoonosis of Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou, Guangdong 510642, PR China
| | - Shulin Tang
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Tianhe District, Guangzhou, Guangdong 510642, PR China; Key Laboratory of Zoonosis of Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou, Guangdong 510642, PR China
| | - Wenchu Ye
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Tianhe District, Guangzhou, Guangdong 510642, PR China; Key Laboratory of Zoonosis of Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou, Guangdong 510642, PR China
| | - Wenya Zhu
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Tianhe District, Guangzhou, Guangdong 510642, PR China; Key Laboratory of Zoonosis of Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou, Guangdong 510642, PR China
| | - Yiqun Deng
- Guangdong Provincial Key Laboratory of Protein Function and Regulation in Agricultural Organisms, College of Life Sciences, South China Agricultural University, Tianhe District, Guangzhou, Guangdong 510642, PR China; Key Laboratory of Zoonosis of Ministry of Agriculture and Rural Affairs, South China Agricultural University, Guangzhou, Guangdong 510642, PR China.
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Carter AC, King JB, Mattes AO, Cai S, Singh N, Cichewicz RH. Natural-Product-Inspired Compounds as Countermeasures against the Liver Carcinogen Aflatoxin B 1. J Nat Prod 2019; 82:1694-1703. [PMID: 31136174 DOI: 10.1021/acs.jnatprod.9b00290] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/09/2023]
Abstract
Aflatoxin B1 (AfB1) ranks among the most potent liver carcinogens known, and the accidental or intentional exposure of humans and livestock to this toxin remains a serious global threat. One protective measure that had been proposed is employing small-molecule therapeutics capable of mitigating the toxicity of AfB1; however, to date, these efforts have had little clinical success. To identify molecular scaffolds that reduce the toxicity of AfB1, we developed a cell-based high-throughput high-content imaging assay that enabled our team to test natural products (pure compounds, fractions, and extracts) for protection of monolayers and spheroids composed of HepG2 liver cells against AfB1. The spheroid assay showed notable potential for further development, as it afforded greater sensitivity of HepG2 cells to AfB1, which is believed to better mimic the in vivo response of hepatocytes to the toxin. One of the most bioactive compounds to arise from this investigation was alternariol-9-methyl ether (1, purified from an Alternaria sp. isolate), which inspired the synthesis and testing of several structurally related molecules. Based on these findings, it is proposed that several types of natural and synthetic polyarene molecules that have undergone oxidative functionalization (e.g., compounds containing 3-methoxyphenol moieties) are promising starting points for the development of new agents that protect against AfB1 toxicity.
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Affiliation(s)
- Adam C Carter
- Natural Products Discovery Group, Institute for Natural Products Applications and Research Technologies, Department of Chemistry & Biochemistry, Stephenson Life Science Research Center , University of Oklahoma , 101 Stephenson Parkway , Norman , Oklahoma 73019 , United States
| | - Jarrod B King
- Natural Products Discovery Group, Institute for Natural Products Applications and Research Technologies, Department of Chemistry & Biochemistry, Stephenson Life Science Research Center , University of Oklahoma , 101 Stephenson Parkway , Norman , Oklahoma 73019 , United States
| | - Allison O Mattes
- Natural Products Discovery Group, Institute for Natural Products Applications and Research Technologies, Department of Chemistry & Biochemistry, Stephenson Life Science Research Center , University of Oklahoma , 101 Stephenson Parkway , Norman , Oklahoma 73019 , United States
| | - Shengxin Cai
- Natural Products Discovery Group, Institute for Natural Products Applications and Research Technologies, Department of Chemistry & Biochemistry, Stephenson Life Science Research Center , University of Oklahoma , 101 Stephenson Parkway , Norman , Oklahoma 73019 , United States
| | - Narender Singh
- CFD Research Corporation , 701 McMillian Way, Suite D , Huntsville , Alabama 35806 , United States
| | - Robert H Cichewicz
- Natural Products Discovery Group, Institute for Natural Products Applications and Research Technologies, Department of Chemistry & Biochemistry, Stephenson Life Science Research Center , University of Oklahoma , 101 Stephenson Parkway , Norman , Oklahoma 73019 , United States
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Cheng L, Qin Y, Hu X, Ren L, Zhang C, Wang X, Wang W, Zhang Z, Hao J, Guo M, Wu Z, Tian J, An L. Melatonin protects in vitro matured porcine oocytes from toxicity of Aflatoxin B1. J Pineal Res 2019; 66:e12543. [PMID: 30584671 DOI: 10.1111/jpi.12543] [Citation(s) in RCA: 37] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/08/2018] [Revised: 05/31/2018] [Accepted: 06/22/2018] [Indexed: 01/08/2023]
Abstract
Aflatoxin B1 (AFB1) is a major food and feed contaminant that threaten public health. Previous studies indicate that AFB1 exposure disrupted oocyte maturation. However, an effective and feasible method is unavailable for protecting oocytes against toxicity of AFB1. In the present study, using in vitro matured porcine oocytes and parthenogenetic embryos as model, we confirmed that AFB1 exposure during in vitro oocyte maturation (IVM) significantly impaired both nuclear and cytoplasmic maturation in a dose- and time-dependent manner. The different concentrations of melatonin were also tested for their protective effects on oocytes against the AFB1-induced toxicity. Our results showed that supplementation of a relative high concentration of melatonin (10-3 mol/L) during IVM efficiently reversed the impaired development rate and blastocyst quality, to the levels comparable to those of the control group. Further analysis indicated that melatonin application efficiently alleviated reactive oxygen species accumulation and initiation of apoptosis induced by AFB1 exposure. In addition, disrupted GSH/GPX system, as well as inhibited mitochondrial DNA (mtDNA) replication and mitochondrial biogenesis in AFB1-treated oocytes, can be notably reversed by melatonin application. Furthermore, cumulus cells may be important in mediating the toxicity of AFB1 to oocytes, and the metabolism of AFB1 in cumulus cells can be depressed by melatonin. To the best of our knowledge, this is the first report to confirm that melatonin application can efficiently protect oocytes from AFB1-induced toxicity. Our study provides a promising and practical strategy for alleviating or reversing AFB1-induced female reproductive toxicity in both clinical treatment and domestic reproductive management.
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Affiliation(s)
- Linghua Cheng
- Key Laboratory of Animal Genetics, Breeding and Reproduction of the Ministry of Agriculture, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Yusheng Qin
- Key Laboratory of Animal Genetics, Breeding and Reproduction of the Ministry of Agriculture, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Xiao Hu
- Key Laboratory of Animal Genetics, Breeding and Reproduction of the Ministry of Agriculture, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Likun Ren
- Key Laboratory of Animal Genetics, Breeding and Reproduction of the Ministry of Agriculture, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China
- Assisted Reproductive Centre of the Department of Gynaecology and Obstetrics, PLA Naval General Hospital, Beijing, China
| | - Chao Zhang
- Key Laboratory of Animal Genetics, Breeding and Reproduction of the Ministry of Agriculture, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Xiaodong Wang
- Key Laboratory of Animal Genetics, Breeding and Reproduction of the Ministry of Agriculture, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Wenjuan Wang
- Key Laboratory of Animal Genetics, Breeding and Reproduction of the Ministry of Agriculture, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Zhenni Zhang
- Key Laboratory of Animal Genetics, Breeding and Reproduction of the Ministry of Agriculture, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Jin Hao
- Key Laboratory of Animal Genetics, Breeding and Reproduction of the Ministry of Agriculture, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Min Guo
- Key Laboratory of Animal Genetics, Breeding and Reproduction of the Ministry of Agriculture, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Zhonghong Wu
- Key Laboratory of Animal Genetics, Breeding and Reproduction of the Ministry of Agriculture, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Jianhui Tian
- Key Laboratory of Animal Genetics, Breeding and Reproduction of the Ministry of Agriculture, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China
| | - Lei An
- Key Laboratory of Animal Genetics, Breeding and Reproduction of the Ministry of Agriculture, National Engineering Laboratory for Animal Breeding, College of Animal Science and Technology, China Agricultural University, Beijing, China
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Fang J, Zhu P, Yang Z, Peng X, Zuo Z, Cui H, Ouyang P, Shu G, Chen Z, Huang C, Liu W. Selenium Ameliorates AFB 1-Induced Excess Apoptosis in Chicken Splenocytes Through Death Receptor and Endoplasmic Reticulum Pathways. Biol Trace Elem Res 2019; 187:273-280. [PMID: 29770949 DOI: 10.1007/s12011-018-1361-7] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Accepted: 04/23/2018] [Indexed: 01/28/2023]
Abstract
Aflatoxin B1 (AFB1) can cause hepatotoxicity, genotoxicity, and immunosuppressive effects for a variety of organisms. Selenium (Se), as an essential nutrient element, plays important protective effects against cell apoptosis induced by AFB1. This research aimed to reveal the ameliorative effects of selenium on AFB1-induced excess apoptosis in chicken splenocytes through death receptor and endoplasmic reticulum pathways in vivo. Two hundred sixteen neonatal chickens, randomized into four treatments, were fed with basal diet (control treatment), 0.4 mg/kg Se supplement (+Se treatment), 0.6 mg/kg AFB1 (AFB1 treatment), and 0.6 mg/kg AFB1 + 0.4 mg/kg Se (AFB1 + Se treatment) during 21 days of experiment, respectively. Compared with the AFB1 treatment, the levels of splenocyte apoptosis in the AFB1 + Se treatment were obviously dropped by flow cytometry and TUNEL assays although they were still significantly higher than those in the control or + Se treatments. Furthermore, the mRNA expressions of CASP-3, CASP-8 and CASP-10, GRP78, GRP94, TNF-α, TNF-R1, FAS, and FASL of splenocytes in the AFB1 + Se treatment by qRT-PCR assay were significantly decreased compared with the AFB1 treatment. These results indicate that Se could partially ameliorate the AFB1-caused excessive apoptosis of chicken splenocytes through downregulation of endoplasmic reticulum and death receptor pathway molecules. This research may rich the knowledge of the detoxification mechanism of Se on AFB1-induced apoptosis.
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Affiliation(s)
- Jing Fang
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China
- Key Laboratory of Animal Diseases and Environmental Hazards of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China
| | - Panpan Zhu
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China
- Key Laboratory of Animal Diseases and Environmental Hazards of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China
| | - Zhuangzhi Yang
- Chengdu Academy of Agriculture and Forestry Sciences, Chengdu, 611130, Sichuan, People's Republic of China
| | - Xi Peng
- College of Life Sciences, China West Normal University, Nanchong, 637002, Sichuan, People's Republic of China.
| | - Zhicai Zuo
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China.
- Key Laboratory of Animal Diseases and Environmental Hazards of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China.
| | - Hengmin Cui
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China
- Key Laboratory of Animal Diseases and Environmental Hazards of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China
| | - Ping Ouyang
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China
| | - Gang Shu
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China
| | - Zhengli Chen
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China
| | - Chao Huang
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China
| | - Wentao Liu
- College of Veterinary Medicine, Sichuan Agricultural University, Chengdu, 611130, Sichuan, People's Republic of China
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Ogunade I, Jiang Y, Adeyemi J, Oliveira A, Vyas D, Adesogan A. Biomarker of Aflatoxin Ingestion: ¹H NMR-Based Plasma Metabolomics of Dairy Cows Fed Aflatoxin B₁ with or without Sequestering Agents. Toxins (Basel) 2018; 10:toxins10120545. [PMID: 30567330 PMCID: PMC6316819 DOI: 10.3390/toxins10120545] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2018] [Revised: 12/07/2018] [Accepted: 12/11/2018] [Indexed: 12/27/2022] Open
Abstract
The study applied ¹H NMR-based plasma metabolomics to identify candidate biomarkers of aflatoxin B1 (AFB₁) ingestion in dairy cows fed no sequestering agents and evaluate the effect of supplementing clay and/or a Saccharomyces cerevisiae fermentation product (SCFP) on such biomarkers. Eight lactating cows were randomly assigned to 1 of 4 treatments in a balanced 4 × 4 Latin square design with 2 squares. Treatments were: control, toxin (T; 1725 µg AFB₁/head/day), T with clay (CL; 200 g/head/day), and CL with SCFP (CL + SCFP; 35 g of SCFP/head/day). Cows in T, CL, and CL + SCFP were dosed with AFB₁ from d 26 to 30. The sequestering agents were top-dressed from d 1 to 33. On d 30 of each period, 15 mL of blood was taken from the coccygeal vessels and plasma samples were prepared by centrifugation. Compared to the control, T decreased plasma concentrations of alanine, acetic acid, leucine, arginine and valine. In contrast, T increased plasma ethanol concentration 3.56-fold compared to control. Treatment with CL tended to reduce sarcosine concentration, whereas treatment with CL + SCFP increased concentrations of mannose and 12 amino acids. Based on size of the area under the curve (AUC) of receiver operating characteristic and fold change (FC) analyses, ethanol was the most significantly altered metabolite in T (AUC = 0.88; FC = 3.56); hence, it was chosen as the candidate biomarker of aflatoxin ingestion in dairy cows fed no sequestering agent.
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Affiliation(s)
- Ibukun Ogunade
- College of Agriculture, Communities, and the Environment, Kentucky State University, Frankfort, KY 40601, USA.
| | - Yun Jiang
- Department of Animal Sciences, University of Florida, Gainesville, FL 32611, USA.
| | - James Adeyemi
- College of Agriculture, Communities, and the Environment, Kentucky State University, Frankfort, KY 40601, USA.
| | - Andre Oliveira
- Institute of Agriculture and Environmental Sciences, Federal University of Mato Grosso, Sinop, MT 78557-267, Brazil.
| | - Diwakar Vyas
- Department of Animal Sciences, University of Florida, Gainesville, FL 32611, USA.
| | - Adegbola Adesogan
- Department of Animal Sciences, University of Florida, Gainesville, FL 32611, USA.
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10
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Wang J, Chen Y, Mo PL, Wei YJ, Liu KC, Zhang ZG, Zhang ZW, Chen XP, Zhang L. 1α,25-Dihydroxyvitamin D 3 inhibits aflatoxin B1-induced proliferation and dedifferentiation of hepatic progenitor cells by regulating PI3K/Akt and Hippo pathways. J Steroid Biochem Mol Biol 2018; 183:228-237. [PMID: 30099061 DOI: 10.1016/j.jsbmb.2018.08.002] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/15/2018] [Revised: 07/23/2018] [Accepted: 08/07/2018] [Indexed: 12/15/2022]
Abstract
Hepatic progenitor cells (HPCs) might be the origin of hepatocellular carcinoma. 1α,25-Dihydroxyvitamin D3 (1,25(OH)2D3) (VD3) has been documented as an anticancer agent for various cancers. However, the potential effect of VD3 on the proliferation and malignant transformation of HPCs induced by aflatoxin B1 (AFB1) has not been determined. In this study, we found that AFB1 exhibited the stimulative effects on the proliferation, dedifferentiation and invasion of HPCs via activating AKT pathway but turning off Hippo pathway, which were terminated when VD3 was used in combination with AFB1. Furthermore, in AFB1-induced liver damage mouse model, VD3 also showed protective effect by reducing HPCs population. Together, these preclinical data not only provide a newly identified mechanism by which AFB1 affects HPCs but also strengthen the idea of developing VD3 as an anticancer agent.
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Affiliation(s)
- Jian Wang
- Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China
| | - Yan Chen
- Department of Pediatrics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, People's Republic of China
| | - Ping-Li Mo
- State Key Laboratory of Cellular Stress Biology, Innovation Center for Cell Signaling Network, School of Life Sciences, Xiamen University, Xiamen 361012, People's Republic of China
| | - Yi-Ju Wei
- Department of Pediatrics, Hematology Oncology, Pennsylvania State University College of Medicine, Hershey 17033, PA, USA
| | - Kuan-Cheng Liu
- College of Life Sciences, Zhejiang Sci-Tech University, Hangzhou 310018, People's Republic of China
| | - Zhan-Guo Zhang
- Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China
| | - Zhi-Wei Zhang
- Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China
| | - Xiao-Ping Chen
- Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China
| | - Lei Zhang
- Hepatic Surgery Center, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, People's Republic of China.
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11
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Yu YY, Niu J, Yin P, Mei XT, Liu YJ, Tian LX, Xu DH. Detoxification and immunoprotection of Zn(II)-curcumin in juvenile Pacific white shrimp (Litopenaeus vannamei) feed with aflatoxin B1. Fish Shellfish Immunol 2018; 80:480-486. [PMID: 29782917 DOI: 10.1016/j.fsi.2018.05.034] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/13/2018] [Revised: 05/08/2018] [Accepted: 05/17/2018] [Indexed: 06/08/2023]
Abstract
Aflatoxins, which was produced by Aspergillus flavus or Aspergillus parasiticus fungi during grain and feed processing or storage, could cause severe health problems and reduction of yield during shrimp cultures. To evaluate toxic effects of aflatoxin B1 (AFB1) in juvenile Pacific white shrimp (Litopenaeus vannamei) and potential protective effect of Zn(II)-curcumin (Zn-CM), four experimental diets (control, 500 μg/kg AFB1, 500 μg/kg AFB1+100 mg/kg Zn-CM, 500 μg/kg AFB1+200 mg/kg Zn-CM) were formulated in quadruplicate to feed the shrimp for 8 weeks. The results revealed that AFB1 could induce significant decrease in final body weight (FBW), weight gain (WG, %) and visible variations of the hepatopancreas structures in L.vannamei. Compared with AFB1 group, AFB1+100 mg/kg Zn-CM group significantly ameliorated the toxic effects of AFB1 on growth performance, while AFB1+100 mg/kg Zn-CM group had no effect on growth performance. Dietary AFB1+100 mg/kg Zn-CM enhanced phenoloxidase (PO) (P < 0.05) activity. Both dietary AFB1+100 mg/kg Zn-CM and AFB1+200 mg/kg Zn-CM reduced inducible nitric oxide synthase (iNOS) activity and glutathione (GSH) level, decreased the content of malondialdehyde (MDA) (P < 0.05) in hepatopancreas compared with AFB1 group. Transmission electron microscopy (TEM) analysis demonstrated that Zn-CM could relieve the microvilli transformation and mitochondria accumulation reduction caused by AFB1. Consequently, the results demonstrated that suitable Zn-CM could mitigate the AFB1-induced hepatotoxicity and immunotoxicity effects on L.vannamei.
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Affiliation(s)
- Ying-Ying Yu
- Laboratory of Traditional Chinese Medicine and Marine Drugs, Department of Biochemistry, Traditional Chinese Medicine and Marine Drugs, School of Life Sciences, Sun Yat-sen University, Guangzhou, China; Institute of Aquatic Economic Animals, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Jin Niu
- Institute of Aquatic Economic Animals, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Peng Yin
- Institute of Aquatic Economic Animals, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Xue-Ting Mei
- Laboratory of Traditional Chinese Medicine and Marine Drugs, Department of Biochemistry, Traditional Chinese Medicine and Marine Drugs, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Yong-Jian Liu
- Institute of Aquatic Economic Animals, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Li-Xia Tian
- Institute of Aquatic Economic Animals, School of Life Sciences, Sun Yat-sen University, Guangzhou, China
| | - Dong-Hui Xu
- Laboratory of Traditional Chinese Medicine and Marine Drugs, Department of Biochemistry, Traditional Chinese Medicine and Marine Drugs, School of Life Sciences, Sun Yat-sen University, Guangzhou, China.
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12
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Fedeles BI, Essigmann JM. Impact of DNA lesion repair, replication and formation on the mutational spectra of environmental carcinogens: Aflatoxin B 1 as a case study. DNA Repair (Amst) 2018; 71:12-22. [PMID: 30309820 DOI: 10.1016/j.dnarep.2018.08.008] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
In a multicellular organism, somatic mutations represent a permanent record of the past chemical and biochemical perturbations experienced by a cell in its local microenvironment. Akin to a perpetual recording device, with every replication, genomic DNA accumulates mutations in patterns that reflect: i) the sequence context-dependent formation of DNA damage, due to environmental or endogenous reactive species, including spontaneous processes; ii) the activity of DNA repair pathways, which, depending on the type of lesion, can erase, ignore or exacerbate the mutagenic consequences of that DNA damage; and iii) the choice of replication machinery that synthesizes the nascent genomic copy. These three factors result in a richly contoured sequence context-dependent mutational spectrum that, from appearances, is distinct for most individual forms of DNA damage. Such a mutagenic legacy, if appropriately decoded, can reveal the local history of genome-altering events such as chemical or pathogen exposures, metabolic stress, and inflammation, which in turn can provide an indication of the underlying causes and mechanisms of genetic disease. Modern tools have positioned us to develop a deep mechanistic understanding of the cellular factors and pathways that modulate a mutational process and, in turn, provide opportunities for better diagnostic and prognostic biomarkers, better exposure risk assessment and even actionable therapeutic targets. The goal of this Perspective is to present a bottom-up, lesion-centric framework of mutagenesis that integrates the contributions of lesion replication, lesion repair and lesion formation to explain the complex mutational spectra that emerge in the genome following exposure to mutagens. The mutational spectra of the well-studied hepatocarcinogen aflatoxin B1 are showcased here as specific examples, but the implications are meant to be generalizable.
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Affiliation(s)
- Bogdan I Fedeles
- Departments of Biological Engineering, Chemistry and The Center for Environmental Health Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
| | - John M Essigmann
- Departments of Biological Engineering, Chemistry and The Center for Environmental Health Sciences, Massachusetts Institute of Technology, Cambridge, MA 02139, USA.
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Ji N, Diao E, Li X, Zhang Z, Dong H. Detoxification and safety evaluation of aflatoxin B1 in peanut oil using alkali refining. J Sci Food Agric 2016; 96:4009-14. [PMID: 26694215 DOI: 10.1002/jsfa.7592] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2015] [Revised: 12/11/2015] [Accepted: 12/11/2015] [Indexed: 05/26/2023]
Abstract
BACKGROUND Aflatoxin B1 (AFB1 ) is often detected in peanut oil, which comes from contaminated peanuts. AFB1 in peanut oil seriously threatens the health of consumers. However, there are few methods to effectively remove AFB1 in peanut oil. This study aimed to use an alkali-refining method to degrade AFB1 in peanut oil efficiently without increasing the equipment of oil and fat refining. RESULTS The optimum detoxifying conditions of AFB1 in peanut oil with alkali refining were established using response surface methodology (RSM), and the safety of peanut oil after being refined with alkali was evaluated based on the Ames tests and HepG2 cell viability. The results showed that AFB1 in peanut oil was decreased from 34.78 to 0.37 µg kg(-1) (98.94% reduction) under the optimum detoxifying conditions, i.e. when the initial temperature of alkali refining was 43.51 °C, the amount of excess alkali was 0.30%, the content of alkali solution was 23.42% and the end temperature of alkali refining was 77.07 °C. The acid value and color of peanut oil refined by alkali were improved significantly, while the peroxide value was increased within an acceptable level. The safety of peanut oil contaminated by AFB1 was improved significantly after being refined with alkali. CONCLUSION These results indicate that alkali refining is an effective method for removing AFB1 in peanut oil. The optimum detoxifying conditions of AFB1 in peanut oil with alkali refining could be used to guide the production of oil companies for ensuring food safety. © 2015 Society of Chemical Industry.
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Affiliation(s)
- Ning Ji
- College of Food Science and Engineering, Shandong Agricultural University, No. 61, Daizong Street, Taian, 271018, China
| | - Enjie Diao
- College of Food Science and Engineering, Shandong Agricultural University, No. 61, Daizong Street, Taian, 271018, China
| | - Xiangyang Li
- College of Food Science and Engineering, Shandong Agricultural University, No. 61, Daizong Street, Taian, 271018, China
| | - Zheng Zhang
- College of Food Science and Engineering, Shandong Agricultural University, No. 61, Daizong Street, Taian, 271018, China
| | - Haizhou Dong
- College of Food Science and Engineering, Shandong Agricultural University, No. 61, Daizong Street, Taian, 271018, China
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14
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Chen KH, Gao T, Pan JF, Wei HM, Jia CH, Lan J, Chen ZX, Pan D, Bai XC. [Docosahexaenoic acid inhibits aflatoxin B1-induced migration and invasion in hepatocellular carcinoma cells in vitro]. Nan Fang Yi Ke Da Xue Xue Bao 2016; 36:952-956. [PMID: 27435775] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
OBJECTIVE To investigate the effect of docosahexaenoic acid (DHA) on invasiveness of aflatoxin B1 (AFB1)-induced hepatocellular carcinoma cells in vitro. METHODS HepG2.2.15 cells were exposed to different concentrations of AFB1 and DHA plus AFB1. The cell migration and invasion were assessed using wound-healing and Transwell assay, and flow cytometry was used to analyze the cell cycle changes. The ultrastructural changes of the cells were observed by transmission electron microscopy. RESULTS Compared with the control group, the cells exposed to2 µmol/L AFB1 showed obviously enhanced migration and invasion with decreased cell ratio in G1/G1 phase and increased cell ratio in G2/M phase but no changes in S phase cells; transmission electron microscopy revealed the presence of multiple nucleoli and significantly increased mitochondria and Golgi apparatus in the exposed cells. Compared with AFB1-exposed cells, the cells treated with DHA and AFB1 showed decreased migration and invasion abilities, and the G1/G1 phase cells increased and G2/M phase cells decreased significantly; ultrastructurally, the cells contained single nucleoli with decreased mitochondria and vacuolization occurred in the cytoplasm. CONCLUSION DHA can significantly inhibit AFB1-induced enhancement of cell migration and invasion in hepatocellular carcinoma cells in vitro.
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Affiliation(s)
- Ke-He Chen
- Department of Chemotherapy, Guangxi Zhuang Autonomous Region People's Hospital, Nanning 530021, China.E-mail:
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15
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Paul S, Jakhar R, Bhardwaj M, Kang SC. Glutathione-S-transferase omega 1 (GSTO1-1) acts as mediator of signaling pathways involved in aflatoxin B1-induced apoptosis-autophagy crosstalk in macrophages. Free Radic Biol Med 2015; 89:1218-30. [PMID: 26561775 DOI: 10.1016/j.freeradbiomed.2015.11.006] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/06/2015] [Revised: 10/19/2015] [Accepted: 11/04/2015] [Indexed: 12/29/2022]
Abstract
Aflatoxin B1 (AFB1) is the most toxic aflatoxin species and has been shown to be associated with specific as well as non-specific immune responses. In the present study, using murine macrophage Raw 264.7 cells as a model, we report that short exposure (6h) to AFB1 caused an increase in the cellular calcium pool in mitochondria, which in turn elevated reactive oxygen species (ROS)-mediated oxidative stress and led to loss of mitochondrial membrane potential and ultimately c-Jun N-terminal kinases (JNK)-mediated caspase-dependent cell death. On the contrary, longer exposure (12h) to AFB1 reduced JNK phosphorylation and cell death in macrophages. Measurement of autophagic flux demonstrated that autophagy induction through the canonical pathway was responsible for suppressing AFB1-induced apoptosis after 12h. As a detailed molecular mechanism, we found that the unfolded protein response (UPR) machinery was active at 12h post-exposure to AFB1 and induced cytoprotective autophagy as confirmed by determination of major autophagic markers. Inhibition of autophagy by Beclin-1 siRNA also resulted in JNK-mediated cell death. We further established that glutathione S transferase omega1-1 (GSTO1-1), a specific class of GST, was the responsible factor between apoptosis and autophagy crosstalk. Targeting of GSTO1-1 increased JNK-mediated apoptosis by 2-fold compared to the control, whereas autophagy rate was reduced. Thus, increased expression of GSTO1-1 was associated with increased protein glutathionylation, an important protein modification in response to cellular redox status.
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Affiliation(s)
- Souren Paul
- Department of Biotechnology, Daegu University, Kyoungsan, Kyoungbook 712-714, Republic of Korea
| | - Rekha Jakhar
- Department of Biotechnology, Daegu University, Kyoungsan, Kyoungbook 712-714, Republic of Korea
| | - Monika Bhardwaj
- Department of Biotechnology, Daegu University, Kyoungsan, Kyoungbook 712-714, Republic of Korea
| | - Sun Chul Kang
- Department of Biotechnology, Daegu University, Kyoungsan, Kyoungbook 712-714, Republic of Korea.
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Iram W, Anjum T, Iqbal M, Ghaffar A, Abbas M. Mass spectrometric identification and toxicity assessment of degraded products of aflatoxin B1 and B2 by Corymbia citriodora aqueous extracts. Sci Rep 2015; 5:14672. [PMID: 26423838 PMCID: PMC4589780 DOI: 10.1038/srep14672] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/26/2015] [Accepted: 09/03/2015] [Indexed: 11/08/2022] Open
Abstract
This study explores the detoxification potential of Corymbia citriodora plant extracts against aflatoxin B1 and B2 (AFB1; 100 μg L(-1) and AFB2; 50 μg L(-1)) in In vitro and In vivo assays. Detoxification was qualitatively and quantitatively analyzed by TLC and HPLC, respectively. The study was carried out by using different parameters of optimal temperature, pH and incubation time period. Results indicated that C. citriodora leaf extract(s) more effectively degrade AFB1 and AFB2 i.e. 95.21% and 92.95% respectively than C. citriodora branch extract, under optimized conditions. The structural elucidation of degraded toxin products was done by LCMS/MS analysis. Ten degraded products of AFB1 and AFB2 and their fragmentation pathways were proposed based on molecular formulas and MS/MS spectra. Toxicity of these degraded products was significantly reduced as compared to that of parent compounds because of the removal of double bond in the terminal furan ring. The biological toxicity of degraded toxin was further analyzed by brine shrimps bioassay, which showed that only 17.5% mortality in larvae was recorded as compared to untreated toxin where 92.5% mortality was observed after 96hr of incubation. Therefore, our finding suggests that C. citriodora leaf extract can be used as an effective tool for the detoxification of aflatoxins.
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Affiliation(s)
- Wajiha Iram
- Institute of Agricultural Sciences, University of the Punjab, Pakistan
| | - Tehmina Anjum
- Institute of Agricultural Sciences, University of the Punjab, Pakistan
| | - Mazhar Iqbal
- Health Biotechnology Division, National Institute for Biotechnology & Genetic Engineering (NIBGE), Faisalabad, Pakistan
| | - Abdul Ghaffar
- Department of Chemistry University of Engineering and Technology Lahore, Pakistan
| | - Mateen Abbas
- Quality Operating Laboratory (QOL), University of Veterinary and Animal Sciences, Pakistan
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17
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Liao S, Shi D, Clemons-Chevis CL, Guo S, Su R, Qiang P, Tang Z. Protective role of selenium on aflatoxin b1-induced hepatic dysfunction and apoptosis of liver in ducklings. Biol Trace Elem Res 2014; 162:296-301. [PMID: 25274191 DOI: 10.1007/s12011-014-0131-4] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/01/2014] [Accepted: 09/15/2014] [Indexed: 01/11/2023]
Abstract
Aflatoxin B1 (AFB1) is a mycotoxin which causes toxicity through oxidative damage. Selenium (Se), an antioxidative agent, can antagonize some toxicity induced by oxidative stress. The aim of this work was to investigate the toxicity of AFB1 and the protective effects of Se on duckling liver in vivo. The study consisted of three groups: AFB1, AFB1Tx, and a control group. AFB1 group was administered aflatoxin intragastrically (0.1 mg/kg body weight). AFB1Tx group was administered AFB1 intragastrically (0.1 mg/kg body weight) plus sodium selenite (1 mg/kg body weight). The control group was given the same volume of dimethyl sulfoxide (DMSO) via intragastric intubation. All three groups received daily administrations for 28 days. Blood samples were obtained on the 14th, 21st, and 28th days of post-administration, and the serum alanine aminotransferase (ALT) and aspartate transaminase (AST) were evaluated. A high level of serum ALT and AST was observed in AFB1 group. The activity of ALT and AST was significantly lower in Se treatment group than those in AFB1 group. Liver samples were collected on the 14th, 21st, and 28th days of post-administration, and concentrations of Bcl-2, Bax, caspase-3, and p53 were measured. Increased expression level of Bax, caspase-3, and p53 and decreased Bcl-2 expression level and Bcl-2/Bax ratio were observed in AFB1 group. Se diminished hepatic dysfunction, or damage and modulated the expression of apoptotic related proteins, in a time-dependent manner. In conclusion, concurrent treatment with Se reduced the AFB1-induced hepatic dysfunction and apoptosis.
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Affiliation(s)
- Shenquan Liao
- Institute for Animal Health, Guangdong Academy of Agricultural Sciences, Guangzhou, 510640, China
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18
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He Y, Fang J, Peng X, Cui H, Zuo Z, Deng J, Chen Z, Lai W, Shu G, Tang L. Effects of sodium selenite on aflatoxin B1-induced decrease of ileac T cell and the mRNA contents of IL-2, IL-6, and TNF-α in broilers. Biol Trace Elem Res 2014; 159:167-73. [PMID: 24807686 DOI: 10.1007/s12011-014-9999-2] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/24/2014] [Accepted: 04/28/2014] [Indexed: 01/15/2023]
Abstract
The aim of this work was to assess the protective effect of sodium selenite on the ileum mucosal immunologic toxicity induced by aflatoxin B1 (AFB1). One hundred and eighty one-day-old healthy male avian broilers were divided into four groups of three replicates and 15 birds per replicate and fed with basal diet (control group), 0.3 mg/kg AFB1 (AFB1 group), 0.4 mg/kg Se (+Se group), and 0.3 mg/kg AFB1+0.4 mg/kg Se (AFB1+Se group), respectively. The ileac T-cell subsets were determined by the methods of flow cytometry (FCM), and the mRNA contents of interleukin-2 (IL-2), interleukin-6(IL-6), and tumor necrosis factor-alpha (TNF-α) by quantitative real-time PCR. Compared with those in control group, the percentages of CD3+, CD3+CD4+, CD3+CD8+ intraepithelial lymphocytes (IELs) and LPLs, the CD4+/CD8+ ratio of IELs, and the mRNA contents of IL-2, IL-6, and TNF-α were decreased in AFB1 group. However, compared with those in AFB1 group, these parameters of AFB1+Se group were increased to be close to those in control group. It was concluded that 0.3 mg/kg AFB1 could reduce the cellular immune function of the ileum mucosa, but 0.4 mg/kg supplemented dietary selenium showed protective effects on AFB1-induced immunologic injury.
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Affiliation(s)
- Yang He
- Key Laboratory of Animal Diseases and Environmental Hazards of Sichuan Province, College of Veterinary Medicine, Sichuan Agricultural University, Ya'an, Sichuan, 625014, China
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Parveen F, Nizamani ZA, Gan F, Chen X, Shi X, Kumbhar S, Zeb A, Huang K. Protective effect of selenomethionine on aflatoxin B1-induced oxidative stress in MDCK cells. Biol Trace Elem Res 2014; 157:266-74. [PMID: 24425350 DOI: 10.1007/s12011-014-9887-9] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Accepted: 01/02/2014] [Indexed: 10/25/2022]
Abstract
AFB1 is a mycotoxin which exerts their cytotoxicity through increasing oxidative damage in target organ. Kidney is one of target organs vulnerable to damage caused by AFB1. In this study, Madin-Darby canine kidney (MDCK) cells were used to evaluate the AFB1-induced cell damage by the MTT assay. The results revealed that the toxic effect of AFB1 on MDCK cells is both dose and time dependent. Half maximal toxic concentration (IC50) was noted at 0.25 μg/ml of AFB1. Further, protective effect of six different concentrations (0.2, 0.8, 1, 2, 4, and 8 μM) of selenomethionine (SeMet) was observed against 0.25 μg/ml of AFB1-induced damage. The results showed that 0.25 μg/ml of AFB1 caused significant increase in oxidative stress, which was demonstrated by significant increase of malondialdehyde (MDA) level, reduction of intracellular GSH level, as well as GPX1 activity and mRNA level in MDCK cells when compared with control. SeMet protected the cells from AFB1-induced oxidative damage in a dose-dependant manner. Good protection could be achieved between 1 and 4 μM of concentration. Amid this range, MDA level significantly decreased while intracellular GSH level and GPX1 activity in addition to mRNA level significantly increased. Moreover, cell viability was significantly improved. It could be concluded that SeMet is a potential antioxidative agent to alleviate AFB1-induced oxidative stress.
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Affiliation(s)
- Fahmida Parveen
- Institute of Nutritional and Metabolic Disorders in Domestic Animals and Fowls, Nanjing Agricultural University, Nanjing, 210095, China
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20
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Mölzer C, Huber H, Steyrer A, Ziesel GV, Wallner M, Hong HT, Blanchfield J, Bulmer AC, Wagner KH. Bilirubin and related tetrapyrroles inhibit food-borne mutagenesis: a mechanism for antigenotoxic action against a model epoxide. J Nat Prod 2013; 76:1958-65. [PMID: 24156291 PMCID: PMC3812704 DOI: 10.1021/np4005807] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Indexed: 05/16/2023]
Abstract
Bilirubin exhibits antioxidant and antimutagenic effects in vitro. Additional tetrapyrroles that are naturally abundant were tested for antigenotoxicity in Salmonella. Un-/conjugated bilirubin (1 and 2), biliverdin (4), bilirubin and biliverdin dimethyl esters (3 and 5), stercobilin (6), urobilin (7), and protoporphyrin (8) were evaluated at physiological concentrations (0.01-2 μmol/plate; 3.5-714 μM) against the metabolically activated food-borne mutagens aflatoxin B1 (9) and 2-amino-1-methyl-6-phenylimidazo[4,5-b]pyridine (10). Compound 8 most effectively inhibited the mutagenic effects of 9 in strain TA102 and 10 in TA98. Compound 7 inhibited 9-induced mutagenesis in strain TA98 most effectively, while 1 and 4 were promutagenic in this strain. This is likely due to their competition with mutagens for phase-II detoxification. Mechanistic investigations into antimutagenesis demonstrate that tetrapyrroles react efficiently with a model epoxide of 9, styrene epoxide (11), to form covalent adducts. This reaction is significantly faster than that of 11 with guanine. Hence, the evaluated tetrapyrroles inhibited genotoxicity induced by poly-/heterocyclic amines found in foods, and novel evidence obtained in the present investigation suggests this may occur via chemical scavenging of genotoxic metabolites of the mutagens investigated. This may have important ramifications for maintaining health, especially with regard to cancer prevention.
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Affiliation(s)
- Christine Mölzer
- Department
of Nutritional Sciences, Emerging Field Oxidative Stress and DNA Stability,
Faculty of Life Sciences, University of
Vienna, Althanstraße
14, 1090 Vienna, Austria
| | - Hedwig Huber
- Department
of Nutritional Sciences, Emerging Field Oxidative Stress and DNA Stability,
Faculty of Life Sciences, University of
Vienna, Althanstraße
14, 1090 Vienna, Austria
| | - Andrea Steyrer
- Department
of Nutritional Sciences, Emerging Field Oxidative Stress and DNA Stability,
Faculty of Life Sciences, University of
Vienna, Althanstraße
14, 1090 Vienna, Austria
| | - Gesa V. Ziesel
- Department
of Nutritional Sciences, Emerging Field Oxidative Stress and DNA Stability,
Faculty of Life Sciences, University of
Vienna, Althanstraße
14, 1090 Vienna, Austria
| | - Marlies Wallner
- Department
of Nutritional Sciences, Emerging Field Oxidative Stress and DNA Stability,
Faculty of Life Sciences, University of
Vienna, Althanstraße
14, 1090 Vienna, Austria
| | - Hung T. Hong
- School
of Chemistry and Molecular Biosciences, University of Queensland, St.
Lucia, Queensland 4072, Australia
| | - Joanne
T. Blanchfield
- School
of Chemistry and Molecular Biosciences, University of Queensland, St.
Lucia, Queensland 4072, Australia
| | - Andrew C. Bulmer
- Heart
Foundation Research Centre, Griffith Health
Institute, Griffith University (Gold Coast Campus), Queensland 4222, Australia
| | - Karl-Heinz Wagner
- Department
of Nutritional Sciences, Emerging Field Oxidative Stress and DNA Stability,
Faculty of Life Sciences, University of
Vienna, Althanstraße
14, 1090 Vienna, Austria
- Heart
Foundation Research Centre, Griffith Health
Institute, Griffith University (Gold Coast Campus), Queensland 4222, Australia
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21
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Fang Y, Feng Y, Wu T, Srinivas S, Yang W, Fan J, Yang C, Wang S. Aflatoxin B1 negatively regulates Wnt/β-catenin signaling pathway through activating miR-33a. PLoS One 2013; 8:e73004. [PMID: 24015284 PMCID: PMC3754916 DOI: 10.1371/journal.pone.0073004] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2013] [Accepted: 07/16/2013] [Indexed: 12/14/2022] Open
Abstract
MicroRNAs are known to play an important role in modulating gene expression in various diseases including cancers and cardiovascular disorders, but only a few of them are associated with the pathology of aflatoxin B1 (AFB1), a potent mycotoxin. Here, we discovered a novel regulatory network between AFB1, miR-33a and β-catenin in human carcinoma cells. The level of miR-33a was up-regulated in hepatocellular carcinoma (HCC) cells treated with AFB1, while in the same cells causing the decrease in β-catenin expression when treated at their IC50 values. miR-33a, specifically miR-33a-5p, was demonstrated to down-regulate the expression of β-catenin, affect the β-catenin pathway, and inhibit cell growth. Also, by employing a luciferase assay, we found that miR-33a down-regulated β-catenin by directly binding to the 3'-UTR of β-catenin. These results suggested that AFB1 might down-regulate β-catenin by up-regulating miR-33a. This understanding opens new lines of thought in the potential role of miR-33a in the clinical therapy of cancer.
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Affiliation(s)
- Yi Fang
- The Ministry of Education Key Laboratory of Biopesticide and Chemical Biology and the College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, P. R. China
- Academy of Integrative Medicine, Fujian University of Traditional Chinese Medicine, Fuzhou, P. R. China
- Fujian Key Laboratory of Integrative Medicine on Geriatrics, Fujian University of Traditional Chinese Medicine, Fuzhou, P. R. China
| | - Youjun Feng
- Department of Microbiology, University of Illinois at Urbana-Champaign, Champaign, Illinois, United States of America
| | - Tongjin Wu
- The Ministry of Education Key Laboratory of Biopesticide and Chemical Biology and the College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, P. R. China
| | - Swaminath Srinivas
- Department of Biochemistry, University of Illinois at Urbana-Champaign, Champaign, Illinois, United States of America
| | - Weiqiang Yang
- The Ministry of Education Key Laboratory of Biopesticide and Chemical Biology and the College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, P. R. China
| | - Jue Fan
- The Ministry of Education Key Laboratory of Biopesticide and Chemical Biology and the College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, P. R. China
| | - Chi Yang
- The Ministry of Education Key Laboratory of Biopesticide and Chemical Biology and the College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, P. R. China
| | - Shihua Wang
- The Ministry of Education Key Laboratory of Biopesticide and Chemical Biology and the College of Life Sciences, Fujian Agriculture and Forestry University, Fuzhou, P. R. China
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22
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Rasooly R, Hernlem B, Friedman M. Low levels of aflatoxin B1, ricin, and milk enhance recombinant protein production in mammalian cells. PLoS One 2013; 8:e71682. [PMID: 23940780 PMCID: PMC3733960 DOI: 10.1371/journal.pone.0071682] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2012] [Accepted: 07/09/2013] [Indexed: 11/18/2022] Open
Abstract
Gene expression in transduced mammalian cells correlates with virus titer, but high doses of vector for gene therapy leads to toxicity in humans and in animals. Changing the optimal tissue culture medium by adding low levels of environmental stressors, such as 1 µM of the fungal toxin aflatoxin B1 (AFB1), 1 ng of the castor bean protein toxin ricin, or 1% reconstituted milk, enhances transcription and increases production of proteins in transduced mammalian cells as demonstrated by production of the following three recombinant proteins: firefly luciferase, β-galactosidase, and green fluorescent protein (GFP). Higher concentrations of the stress-producing substances damage the cells beyond recovery, resulting in inhibited gene expression and cell death. We also evaluated the effect of the stressor substances on the enhanced infectivity of virus. The presented findings extend methods for large-scale transient recombinant protein production in mammalian cells and suggest that it may be possible to reduce the cytotoxicity of the adenovirus by reducing the virus titer without adversely affecting gene expression levels.
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Affiliation(s)
- Reuven Rasooly
- Foodborne Contaminants, Agricultural Research Service, United State Department of Agriculture, Albany, California, United State of America.
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23
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Armando MR, Dogi CA, Poloni V, Rosa CAR, Dalcero AM, Cavaglieri LR. In vitro study on the effect of Saccharomyces cerevisiae strains on growth and mycotoxin production by Aspergillus carbonarius and Fusarium graminearum. Int J Food Microbiol 2012; 161:182-8. [PMID: 23334096 DOI: 10.1016/j.ijfoodmicro.2012.11.016] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2012] [Revised: 10/18/2012] [Accepted: 11/11/2012] [Indexed: 11/18/2022]
Abstract
The effect of Saccharomyces cerevisiae RC008 and RC016 strains, previously selected based on their aflatoxin B₁ mycotoxin binding ability and beneficial properties, against Aspergillus carbonarius and Fusarium graminearum under different interacting environmental conditions was evaluated. In vitro studies on the lag phase, growth rate and ochratoxin A/zearalenone and DON production were carried out under different regimens of a(w) (0.95 and 0.99); pH (4 and 6); temperature (25 and 37 °C) and oxygen availability (normal and reduced). Both yeast strains showed antagonistic activity and decreasing growth rate compared to the control. In general, the RC016 strain showed the greatest inhibitory activity. Except at the interacting condition 0.95 a(W), normal oxygen availability and 37 °C, at both pH values, A. carbonarius and F. graminearum were able to produce large amounts of mycotoxins in vitro. In general, a significant decrease in levels of mycotoxins in comparison with the control was observed. S. cerevisiae RC008 and RC016 could be considered as effective agents to reduce growth and OTA, ZEA and DON production at different interacting environmental conditions, related to those found in stored feedstuff. The beneficial and biocontrol properties of these strains are important in their use as novel additives for the control of mycotoxigenic fungi in stored feedstuffs.
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Affiliation(s)
- M R Armando
- Consejo Nacional de Investigaciones Científicas y Técnicas-CONICET, Agencia Córdoba Ciencia-ACC, Argentina
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24
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Marks KM, Park ES, Arefolov A, Russo K, Ishihara K, Ring JE, Clardy J, Clarke AS, Pelish HE. The selectivity of austocystin D arises from cell-line-specific drug activation by cytochrome P450 enzymes. J Nat Prod 2011; 74:567-573. [PMID: 21348461 PMCID: PMC3081663 DOI: 10.1021/np100429s] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/06/2010] [Indexed: 05/30/2023]
Abstract
The natural product austocystin D was identified as a potent cytotoxic agent with in vivo antitumor activity and selectivity for cells expressing the multidrug resistance transporter MDR1. We sought to elucidate the mechanism of austocystin D's selective cytotoxic activity. Here we show that the selective cytotoxic action of austocystin D arises from its selective activation by cytochrome P450 (CYP) enzymes in specific cancer cell lines, leading to induction of DNA damage in cells and in vitro. The potency and selectivity of austocystin D is lost upon inhibition of CYP activation and does not require MDR1 expression or activity. Furthermore, the pattern of cytotoxicity of austocystin D was distinct from doxorubicin and etoposide and unlike aflatoxin B(1), a compound that resembles austocystin D and is also activated by CYP enzymes to induce DNA damage. Theses results suggest that austocystin D may be of clinical benefit for targeting or overcoming chemoresistance.
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Affiliation(s)
- Kevin M. Marks
- Makoto Life Sciences, Inc., 15 DeAngelo Drive, Bedford, Massachusetts 01730, United States
| | - Eun Sun Park
- Makoto Life Sciences, Inc., 15 DeAngelo Drive, Bedford, Massachusetts 01730, United States
| | - Alexander Arefolov
- Makoto Life Sciences, Inc., 15 DeAngelo Drive, Bedford, Massachusetts 01730, United States
| | - Katie Russo
- Makoto Life Sciences, Inc., 15 DeAngelo Drive, Bedford, Massachusetts 01730, United States
| | - Keiko Ishihara
- Makoto Life Sciences, Inc., 15 DeAngelo Drive, Bedford, Massachusetts 01730, United States
- Taiho Pharmaceutical Co., LTD., 3 Okubo, Tsukuba, Ibaraki 300-2611, Japan
| | - Jennifer E. Ring
- Makoto Life Sciences, Inc., 15 DeAngelo Drive, Bedford, Massachusetts 01730, United States
| | - Jon Clardy
- Department of Biological Chemistry and Molecular Pharmacology, Harvard Medical School, 240 Longwood Avenue, Boston, Massachusetts 02115, United States
| | - Astrid S. Clarke
- Makoto Life Sciences, Inc., 15 DeAngelo Drive, Bedford, Massachusetts 01730, United States
| | - Henry E. Pelish
- Makoto Life Sciences, Inc., 15 DeAngelo Drive, Bedford, Massachusetts 01730, United States
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Shyamal S, Latha PG, Suja SR, Shine VJ, Anuja GI, Sini S, Pradeep S, Shikha P, Rajasekharan S. Hepatoprotective effect of three herbal extracts on aflatoxin B1-intoxicated rat liver. Singapore Med J 2010; 51:326-331. [PMID: 20505912] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
INTRODUCTION Roots of Ixora coccinea (Rubiaceae), and Rhinacanthus nasuta (Acanthaceae) and whole plants of Spilanthes ciliata (Asteraceae) are extensively used by tribal communities in South India to treat liver diseases. However, the veracity of these tribal claims has not been investigated scientifically using the liver toxin, aflatoxin. This study reports on the protective effects of these three herbal ethanolic extracts on the aflatoxin B1 (AFB1)-intoxicated livers of albino male Wistar rats. METHODS Biochemical parameters, including serum hepatic enzymes (glutamate oxaloacetate transaminase, glutamate pyruvate transaminase and alkaline phosphatase), were studied. Hepatic tissues were processed for assay of reduced glutathione (GSH) and histological alterations. RESULTS Pre-treatment of the rats with oral administration of the plant ethanolic extracts, Ixora coccinea (IC), Rhinacanthus nasuta (RN), Spilanthes ciliata (SC), prior to AFB1 was found to provide significant protection against toxin-induced liver damage, determined 72 hours after the AFB1 challenge (1.5 mg/kg, intraperitoneally) as evidenced by a significant lowering of the activity of the serum enzymes and enhanced hepatic reduced GSH status. Pathological examination of the liver tissues supported the biochemical findings. The three plant extracts, IC, RN and SC, showed significant antilipid peroxidant effects in vitro. CONCLUSION It was concluded that the hepatoprotective effects of the three plant extracts observed in this study might result from their potent antioxidative properties.
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Affiliation(s)
- S Shyamal
- Ethnomedicine and Ethnopharmacology Division, Tropical Botanic Garden and Research Institute, Palode, Thiruvananthapuram 695 562, India
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26
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Sakata K, Oda Y, Miyazawa M. Suppression of SOS-inducing activity of chemical mutagens by metabolites from microbial transformation of (-)-isolongifolene. J Agric Food Chem 2010; 58:2164-2167. [PMID: 20108941 DOI: 10.1021/jf903651c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
In this study, biotransformation of (-)-isolongifolene (1) by Glomerella cingulata and suppressive effect on umuC gene expression by chemical mutagens 2-(2-furyl)-3-(5-nitro-2-furyl)acrylamide (furylfuramide) and aflatoxin B(1) (AFB(1)) of the SOS response in Salmonella typhimurium TA1535/pSK1002 were investigated. Initially, 1 was carried out the microbial transformation by G. cingulata. The result found that 1 was converted into (-)-isolongifolen-9-one (2), (-)-(2S)-13-hydroxy-isolongifolen-9-one (3), and (-)-(4R)-4-hydroxy-isolongifolen-9-one (4) by G. cingulata, and their conversion rates were 60, 25, and 15%, respectively. The metabolites suppressed the SOS-inducing activity of furylfuramid and AFB(1) in the umu test. Comound 2 showed gene expression by chemical mutagens furylfuramide and AFB(1) was suppressed 54 and 50% at <0.5 mM, respectively. Compound 2 is the most effective compound in this experiment.
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Affiliation(s)
- Kazuki Sakata
- Department of Applied Chemistry, Faculty of Science and Engineering, Kinki University, Kowakae, Higashiosakashi, Osaka 577-8502, Japan
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Gesing A, Karbownik-Lewinska M. Protective effects of melatonin and N-acetylserotonin on aflatoxin B1-induced lipid peroxidation in rats. Cell Biochem Funct 2008; 26:314-9. [PMID: 17868196 DOI: 10.1002/cbf.1438] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
Aflatoxin B1 (AFB1) is a potent hepatotoxic and hepatocarcinogenic mycotoxin. Reactive oxygen species are considered to participate in the main mechanism of aflatoxin toxicity. Melatonin (Mel) is a hormone which has antioxidative activities. N-acetylserotonin (NAc-5HT) is an immediate precursor of Mel. Melatonin is documented to be completely safe in humans and animals. The aim of our study was to examine the potential protective effects of Mel or NAc-5HT against lipid peroxidation (LPO), caused by AFB1 in male Wistar rats. Mel and NAc-5HT were intraperitoneally (i.p.) injected for 3 weeks in late afternoon (16:00-18:00) injections (20 mg kg(-1) BW/daily). AFB1 (50 microg kg(-1) BW/daily) was administered i.p. 6 h prior to indoleamine injections. Concentrations of malondialdehyde + 4-hydroxyalkenals (MDA + 4-HDA), as an index of LPO, were measured in liver, brain, lung, testis and kidney homogenates. The level of LPO in tissue homogenates was expressed as the amount of MDA + 4-HDA (nmol) per milligram of protein. AFB1 increased LPO in the liver, lung, brain and testis, but not the kidney. The increase of LPO caused by AFB1 injections was completely prevented by either Mel or NAc-5HT in all the tissues examined. Melatonin can be considered as a protective pharmacological agent in intoxication with AFB1 and the protective effect of NAc-5HT against aflatoxin-induced LPO broadens the knowledge about its antioxidative properties.
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Affiliation(s)
- Adam Gesing
- Department of Oncological Endocrinology, Chair of Endocrinology and Metabolic Diseases, Medical University of Łódź, Poland.
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28
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Su H, Zhao J, Xiong Y, Xu T, Zhou F, Yuan Y, Zhang Y, Zhuang SM. Large-scale analysis of the genetic and epigenetic alterations in hepatocellular carcinoma from Southeast China. Mutat Res 2008; 641:27-35. [PMID: 18358501 DOI: 10.1016/j.mrfmmm.2008.02.005] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2007] [Revised: 01/25/2008] [Accepted: 02/07/2008] [Indexed: 12/31/2022]
Abstract
Our knowledge about molecular alterations during hepatocarcinogenesis is still fragmentary, due to lack of comprehensive genetic and epigenetic analyses in the same set of hepatocellular carcinomas (HCCs). In this study, we conducted a large-scale analysis, including mutation screening in 50 genes and methylation assays in three genes in 54 pairs of HCCs and their neighboring non-cancerous tissues. All samples were collected from the residents in Southeast China. We found HBV infection and chronic hepatitis/cirrhosis in 83.3% and 98.1% of the cases, respectively. Mutations were identified in 18 out of 54 (33.3%) samples, with p53 alterations in 14 cases and beta-catenin mutations in four tumors. No mutations were identified in the neighboring tissues. Interestingly, 9 out of 14 (64.3%) tumors carrying p53 mutations displayed substitution of serine by arginine at codon 249, a characteristic change believed to be induced by aflatoxin-B1. Furthermore, p53 mutation was significantly associated with shorter recurrence-free survival (P=0.004). The results also revealed aberrant methylation in two or more genes in as high as 90% of tumors and 40% of adjacent tissues. The frequency of RASSF1A hypermethylation was much higher than that of p16INK4a and HAI2 in both HCC and neighboring tissues, indicating that deregulation of RASSF1A may precede the other two genes. These data suggest that aberrant methylation occurs before mutation and is an early event in the development of this set of HCC. Our findings highlight p53 as a prognostic factor of HCC and RASSF1A as a potential target in preventing malignant transformation of hepatocytes.
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Affiliation(s)
- Hang Su
- Key Laboratory of Gene Engineering of the Ministry of Education, School of Life Sciences, Sun Yat-sen University, Guangzhou, PR China
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29
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del Río García JC, Moreno Ramos C, Pinton P, Mendoza Elvira S, Oswald IP. [Evaluation of the cytotoxicity of aflatoxin and fumonisin in swine intestinal cells]. Rev Iberoam Micol 2007; 24:136-41. [PMID: 17604433 DOI: 10.1016/s1130-1406(07)70029-3] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022] Open
Abstract
The coexistence of the aflatoxin (AFB) and fumonisin (FB) has been widely documented in many parts of the world. However, few studies describing the synergy effect of both mycotoxins in vivo and/or in vitro are available. The objective of this study consisted on evaluating the effect of AFB and FB on the morphology, the capacity of cellular proliferation, cytotoxicity and interleukin-8 (IL-8) synthesis in a porcine intestinal epithelial cell line (IPEC-1). Concerning to the cellular morphology it was only affected in the concentrations higher of AFB (50 microM) and FB (500 microM). However, the cellular proliferation, the cellular damage and synthesis of IL-8 they were affected when present in combination the AFB/FB (1.3/3.7; 2/3.7 and 5/10 microM respectively) with that showed by the individual effect of similar concentrations of these mycotoxins (p < 0.05). Our data indicate that the combination of AFB/FB in low concentrations showed a synergy effect, altering the cellular morphophysiology, which can imply in vivo the entrance of other toxins or biological agents for alteration of the intestinal barrier impacting negatively in the human or animal health.
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Affiliation(s)
- Juan Carlos del Río García
- Unidad de Investigación en Granos y Semillas UNIGRAS, Facultad de Estudios Superiores Cuautitlán, Universidad Nacional Autónoma de México, 54729 México.
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30
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Arduini F, Errico I, Amine A, Micheli L, Palleschi G, Moscone D. Enzymatic Spectrophotometric Method for Aflatoxin B Detection Based on Acetylcholinesterase Inhibition. Anal Chem 2007; 79:3409-15. [PMID: 17408242 DOI: 10.1021/ac061819j] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new method for aflatoxin B (AFB) determination is proposed. The AFB determination is based on acetylcholinesterase (AChE) inhibition, and the AChE residual activity is determined using the colorimetric method (Ellman's method). Cholinesterases (ChEs) from various sources were tested using AFB1 as reference aflatoxin. AChE from electric eel has shown the highest sensitivity to AFB1, and it was chosen for the rest of the work. To select and optimize the analytical procedures, an investigation on the type of AChE inhibition by AFB1 was carried out. The AChE degree of inhibition by AFB1 was independent of the incubation time and the enzyme concentrations, showing the reversibility of the inhibition. This reversibility of the inhibition permits a rapid analysis of AFB1, requiring only 3 min. For the development of the AFB1 assay, the pH, the time of reaction, temperature, and substrate concentration were evaluated and optimized. The linear range of 10-60 ng mL-1 was determined. To evaluate the selectivity of this method, the cross-reactivity with other aflatoxins such as aflatoxin B2, aflatoxin G1, aflatoxin G2, and aflatoxin M1 was investigated. Finally, the suitability of the assay for AFB1 quantification in barley was evaluated. This study shows a new approach to detect aflatoxins based on enzyme inhibition and has advantages such as the ease of use, rapidity, and cost effectiveness. Thus, it could find a possible use as a screening method for this type of mycotoxins.
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Affiliation(s)
- Fabiana Arduini
- Dipartimento di Scienze e Tecnologie Chimiche, Università di Roma Tor Vergata, Via della Ricerca Scientifica, 1-00133 Roma, Italy
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Amici M, Cecarini V, Pettinari A, Bonfili L, Angeletti M, Barocci S, Biagetti M, Fioretti E, Eleuteri AM. Binding of aflatoxins to the 20S proteasome: effects on enzyme functionality and implications for oxidative stress and apoptosis. Biol Chem 2007; 388:107-17. [PMID: 17214555 DOI: 10.1515/bc.2007.012] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Aflatoxins (AF) are contaminants of improperly stored foods; they are potent genotoxic and carcinogenic compounds, exerting their effects through damage to DNA. They can also induce mutations that increase oxidative damage. The goal of this study was to evaluate the possibility that a third mechanism could be involved in the carcinogenic action of aflatoxins, namely, direct binding to key enzymes involved in the regulatory pathways of the cell cycle, thereby modulating enzyme functionality. The 20S constitutive and immunoproteasome peptidase and proteolytic activities were assayed in the presence of aflatoxins B1, G1 and M1. All three toxins activated multiple peptidase activities of the proteasome. Aflatoxin (AF) M1 was the most potent activator of proteasome activity, while the constitutive 20S proteasome was specifically stimulated by AFG1. Furthermore, the effects of AFB1 on cultured hepatoma cells were investigated and the various proteasomal activities determined with cell lysates were differently affected. Taking into account the key role of the proteasome in cellular defense against oxidative stress, the carbonyl group content and the activities of antioxidant enzymes in cell lysates were analyzed. The proapoptotic effect of AFB1 was also investigated by measuring caspase-3 activity and cellular levels of p27 and IkappaBalpha.
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Affiliation(s)
- Manila Amici
- Department of Molecular, Cellular and Animal Biology, University of Camerino, I-62032 Camerino (MC), Italy
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Peng T, Li LQ, Peng MH, Liu ZM, Liu TW, Yan LN, Shen HM, Wang L, Wang Q, Wang KB, Liang RX, Wei ZL, Ong CN, Santella RM. Is correction for protein concentration appropriate for protein adduct dosimetry? Hypothesis and clues from an aflatoxin B1-exposed population. Cancer Sci 2007; 98:140-6. [PMID: 17233831 DOI: 10.1111/j.1349-7006.2006.00380.x] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022] Open
Abstract
Protein adducts are useful biomarkers for assessing exposure, metabolism and risk of carcinogens. Aflatoxin B1-albumin adducts (AAA) and protein carbonyl content (PCC) have long been used for assessing aflatoxin exposure and oxidative stress to proteins, and the quantitative data are almost exclusively expressed per mg protein. Given the large variation in protein concentrations in plasma among populations, this may not be the most appropriate method. The objective was to test the hypothesis that AAA and PCC should be expressed per mL plasma in population studies. AAA and PCC were analyzed among 402 subjects from three regions of China with a gradient in hepatocellular carcinoma (HCC) mortality ranging from 21 to 97 per 100,000. When biomarker values were expressed per mL plasma, the AAA level was significantly associated with plasma PCC (r = 0.262, P < 0.001), and adjusted levels of AAA and PCC paralleled HCC mortalities in the three regions, suggesting a role for aflatoxin-related oxidative stress in hepatocarcinogenesis in this population. In addition, there were statistically significant associations between both protein biomarkers, expressed per mL plasma, and the levels of alanine aminotransferase and aspartate aminotransferase in hepatitis B virus-infected subjects, suggesting roles for aflatoxin exposure, oxidative stress and hepatitis B virus infection in the development of HCC. The present data suggest that interindividual variation in plasma protein concentration may influence the dosimetry and relevant interpretation of protein biomarkers.
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Affiliation(s)
- Tao Peng
- Department of Hepatobiliary Surgery, First Affiliated Hospital of Guangxi Medical University, Nanning, 530021, Guangxi Province, China
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Singh J, Dani HM, Sharma R, Steinberg P. Inhibition of the biosynthesis of SRP polypeptides and secretory proteins by aflatoxin B1 can disrupt protein targeting. Cell Biochem Funct 2007; 24:507-10. [PMID: 16206272 DOI: 10.1002/cbf.1285] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Cell culture and western blotting studies revealed that aflatoxin B(1) (AFB(1)) inhibits the biosynthesis of two of the constituent polypeptides of signal recognition particle (SRP) (SRP54 and 72). SRP escorts polyribosomes carrying signal peptides from free form in the cytosol to the bound form on endoplasmic reticulum (ER) membrane during protein targeting. These effects of AFB(1) on SRP biosynthesis may inhibit the formation of functional SRP. Our experiments have further shown that AFB(1) also inhibits the biosynthesis/translocation of a secretory protein, preprolactin, which fails to appear in the lumen of ER consequent to the treatment with this hepatocarcinogen. The results of the experiments presented in this article therefore enable us to infer for the first time that aflatoxin B(1) may inhibit the functioning of SRP as an escort and deplete the ER of polyribosomes for secretory protein synthesis. As these secretory proteins are important components of the plasma membrane, gap junctions and intercellular matrix, their absence from these locations could disturb cell to cell communication leading to tumorigenesis.
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Affiliation(s)
- Jasbir Singh
- Department of Biochemistry, Kurukshetra University, Kurukshetra-136119, India.
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Abstract
Aflatoxin B(1) (AFB(1))-N(7)-guanine is the predominant adduct formed upon the reaction of AFB(1)-8,9-exo-epoxide with guanine residues in DNA. AFB(1)-N(7)-guanine can convert to the ring-opened formamidopyrimidine, or the adducted strand can undergo depurination. AFB(1)-N(7)-guanine and AFB(1)-formamidopyrimidine are thought to be predominantly repaired by nucleotide excision repair in bacteria, yeast and mammals. Although AFB(1)-formamidopyrimidine is removed less efficiently than AFB(1)-N(7)-guanine in mammals, both lesions are repaired with equal efficiencies in bacteria, reflecting differences in damage recognition between bacterial and mammalian repair systems. Furthermore, DNA repair activity and modulation of repair by AFB(1) seem to be major determinants of susceptibility to AFB(1)-induced carcinogenesis.
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Affiliation(s)
- Leanne L Bedard
- Department of Pharmacology and Toxicology, Queen's University, Botterell Hall, Kingston, Ont., Canada K7L 3N6
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Tong WM, Lee MK, Galendo D, Wang ZQ, Sabapathy K. Aflatoxin-B exposure does not lead to p53 mutations but results in enhanced liver cancer of Hupki (human p53 knock-in) mice. Int J Cancer 2006; 119:745-9. [PMID: 16557586 DOI: 10.1002/ijc.21890] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Hepatocellular carcinoma (HCC) is a common human malignancy that is often associated with risk factors such as aflatoxin-B1 (AFB1) exposure and Hepatitis-B virus infection in developing countries. There is a strong correlation between these risk factors and mutation of the tumor-suppressor gene p53 at codon 249. In vitro experiments have also shown that treatment of human liver cells with AFB1 results in p53 mutations. A tumor-promoting role for mutant p53 was demonstrated using transgenic mice models, in which HCC development was accelerated upon AFB1-exposure. However, wild-type mice in which AFB1 alone was used to induce liver cancers have failed to recapitulate p53 mutations, raising the possibility that mouse DNA context may not be appropriate for the generation of AFB1-induced p53 mutations. We have now tested this hypothesis using the Hupki mice (human p53 knock-in) in which the mouse DNA-binding domain has been replaced by the homologous human p53 segment. Mice were followed for 80 weeks after AFB1 injection for survival and HCC formation. Hupki mice were found to be more susceptible to AFB1 than wild-type mice. Moreover, only 19% of wild-type mice developed HCCs compared to 44% in Hupki mice. However, none of the liver tumors and normal tissues from Hupki mice contained any mutations in the DNA-binding domain of p53. These findings suggest that the human DNA context of the p53 gene alone may not be the sole determinant of AFB1-induced mutagenesis. Furthermore, humanized p53 appears not to be as effective as murine p53 in the mouse cellular environment in preventing malignant transformation.
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Affiliation(s)
- Wei-Min Tong
- International Agency for Research on Cancer, 69008 Lyon, France
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Belloir C, Singh V, Daurat C, Siess MH, Le Bon AM. Protective effects of garlic sulfur compounds against DNA damage induced by direct- and indirect-acting genotoxic agents in HepG2 cells. Food Chem Toxicol 2006; 44:827-34. [PMID: 16595265 DOI: 10.1016/j.fct.2005.11.005] [Citation(s) in RCA: 49] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2005] [Revised: 05/26/2005] [Accepted: 11/07/2005] [Indexed: 10/24/2022]
Abstract
The aim of this study was to assess the antigenotoxic activity of several garlic organosulfur compounds (OSC) in the human hepatoma cell line HepG2, using comet assay. The OSC selected were allicin (DADSO), diallyl sulfide (DAS), diallyl disulfide (DADS), S-allyl cysteine (SAC) and allyl mercaptan (AM). To explore their potential mechanisms of action, two approaches were performed: (i) a pre-treatment protocol which allowed study of the possible modulation of drug metabolism enzymes by OSC before treatment of the cells with the genotoxic agent; (ii) a co-treatment protocol by which the ability of OSC to scavenge direct-acting compounds was assessed. Preliminary studies showed that, over the concentration range tested (5-100 microM), the studied OSC neither affected cell viability nor induced DNA damage by themselves. In the pre-treatment protocol, aflatoxin B1 genotoxicity was significantly reduced by all the OSC tested except AM. DADS was the most efficient OSC in reducing benzo(a)pyrene genotoxicity. SAC and AM significantly decreased DNA breaks in HepG2 cells treated with dimethylnitrosamine. Additionally, all the OSC studied were shown to decrease the genotoxicity of the direct-acting compounds, hydrogen peroxide and methyl methanesulfonate. This study demonstrated that garlic OSC displayed antigenotoxic activity in human metabolically competent cells.
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Affiliation(s)
- C Belloir
- Institut National de la Recherche Agronomique, Unité Mixte de Recherche de Toxicologie Alimentaire, BP 86510, 17 rue Sully, 21065 Dijon Cedex, France
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Abstract
AIM: To assess the combinative role of aflatoxin B1 (AFB1), cyanobacterial toxins (cyanotoxins), and hepatitis B virus (HBV) x gene in hepatotumorigenicity.
METHODS: One-week-old animals carrying HBV x gene and their wild-type littermates were intraperitoneally (ip) injected with either single-dose AFB1 [6 mg/kg body weight (bw)], repeated-dose cyanotoxins (microcystin-LR or nodularin, 10 μg/kg bw once a week for 15 wk), DMSO (vehicle control) alone, or AFB1 followed by cyanotoxins a week later, and were sacrificed at 24 and 52 wk post-treatment.
RESULTS: AFB1 induced liver tumors in 13 of 29 (44.8%) transgenic mice at 52 wk post-treatment, significantly more frequent than in wild-type mice (13.3%). This significant difference was not shown in the 24-wk study. Compared with AFB1 exposure alone, MC-LR and nodularin yielded approximately 3-fold and 6-fold increases in the incidence of AFB1-induced liver tumors in wild-type animals at 24 wk, respectively. HBV x gene did not further elevate the risk associated with co-exposure to AFB1 and cyanotoxins. With the exception of an MC-LR-dosed wild-type mouse, no liver tumor was observed in mice treated with cyanotoxins alone at 24 wk. Neither DMSO-treated transgenic mice nor their wild-type littermates had pathologic alterations relevant to hepatotumorigenesis in even up to 52 wk.
CONCLUSION: HBV x gene and nodularin promote the development of AFB1-induced liver tumors. Co-exposure to AFB1 and MC-LR tends to elevate the risk of liver tumors at 24 wk relative to exposure to one of them. The combinative effect of AFB1, cyanotoxins and HBVx on hepatotumorigenesis is weak at 24 wk.
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Affiliation(s)
- Min Lian
- School of Public Health, Fudan University, 138 Yixueyuan Road, Shanghai 200032, China.
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Abstract
The effect of pressure cooking on aflatoxin residues in polished rice was conducted to determine reduction of aflatoxin and mutagenic potentials. Three rice lots consisting of naturally contaminated, A. parasiticus-infested, and aflatoxin-spiked rice were steamed by ordinary and pressure cookers after they were washed with water. They were chemically analyzed for aflatoxins using a silica solid phase extraction tube and high-performance liquid chromatography (HPLC)-fluorescence detection (FD), and the presence of aflatoxin residues was confirmed using HPLC-electrospray ionization (ESI)-mass spectrometry (MS). An in vitro mutagenicity test with Salmonella typhimurium TA100 was employed to verify the results based on chemical analyses. The aflatoxin loss (78-88%) was notable after pressure cooking, and the reduction of aflatoxin-induced mutagenic potential (68-78%) was in good agreement with the HPLC results. It can be concluded that Koreans are safe from the aflatoxin-related risk if a pressure cooker is employed for cooking rice. The average Korean daily intake of aflatoxin through the consumption of staple rice would fall to 0.15 ng/kg bw/day, which would not exceed the established tolerable daily intake (0.40 ng/kg bw/day).
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Affiliation(s)
- Je Won Park
- The Graduate School of Biotechnology, Korea University, Seoul 136-701, Republic of Korea.
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Aninat C, Piton A, Glaise D, Le Charpentier T, Langouët S, Morel F, Guguen-Guillouzo C, Guillouzo A. Expression of cytochromes P450, conjugating enzymes and nuclear receptors in human hepatoma HepaRG cells. Drug Metab Dispos 2005; 34:75-83. [PMID: 16204462 DOI: 10.1124/dmd.105.006759] [Citation(s) in RCA: 488] [Impact Index Per Article: 25.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023] Open
Abstract
Most human hepatocyte cell lines lack a substantial set of liver-specific functions, especially major cytochrome P450 (P450)-related enzyme activities, making them unrepresentative of in vivo hepatocytes. We have used the HepaRG cells, derived from a human hepatocellular carcinoma, which exhibit a high differentiation pattern after 2 weeks at confluency to determine whether they could mimic human hepatocytes for drug metabolism and toxicity studies. We show that when passaged at low density, these cells reversed to an undifferentiated morphology, actively divided, and, after having reached confluency, formed typical hepatocyte-like colonies surrounded by biliary epithelial-like cells. By contrast, when seeded at high density, hepatocyte-like clusters retained their typical differentiated morphology. Transcripts of various nuclear receptors (aryl hydrocarbon receptor, pregnane X receptor, constitutive androstane receptor, peroxisome proliferator-activated receptor alpha), P450s (CYP1A2, 2C9, 2D6, 2E1, 3A4), phase 2 enzymes (UGT1A1, GSTA1, GSTA4, GSTM1), and other liver-specific functions were estimated by reverse transcriptase-quantitative polymerase chain reaction and were found to be expressed, for most of them, at comparable levels in both confluent differentiated and high-density differentiated HepaRG cells and in cultured primary human hepatocytes. For several transcripts, the levels were strongly increased in the presence of 2% dimethyl sulfoxide. Measurement of basal activities of several P450s and their response to prototypical inducers as well as analysis of metabolic profiles and cytotoxicity of several compounds confirmed the functional resemblance of HepaRG cells to primary cultured human hepatocytes. In conclusion, HepaRG cells constitute the first human hepatoma cell line expressing high levels of the major P450s involved in xenobiotic metabolism and represent a reliable surrogate to human hepatocytes for drug metabolism and toxicity studies.
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Affiliation(s)
- Caroline Aninat
- Institut National de la Santé et de la Recherche Médicale (INSERM) U620, Université de Rennes 1, France
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Abstract
Spectrofluorimetric studies have revealed that aflatoxin B1 (AFB1) interacts with signal recognition particle (SRP), which acts as an escort for polyribosomes with signal peptides to be transported and bound to the cytoplasmic face of the endoplasmic reticulum (ER). We further report that the binding of AFB1 to SRP is selective as it only binds to two (SRP9 and 14) out of its three constituent polypeptides studied. Binding of AFB1 to proteins is known to alter their conformations. Interactions of AFB1 with SRP polypeptides may generate structural and functional alterations in this particle and hinder secretory protein synthesis.
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Affiliation(s)
- Jasbir Singh
- Department of Biochemistry, Kurukshetra University, Kurukshetra-136119, India
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Kimura M, Lehmann K, Gopalan-Kriczky P, Lotlikar PD. Effect of diet on aflatoxin B1-DNA binding and aflatoxin B1-induced glutathione S-transferase placental form positive hepatic foci in the rat. Exp Mol Med 2005; 36:351-7. [PMID: 15365254 DOI: 10.1038/emm.2004.46] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
Effects of diets on hepatic aflatoxin B1 (AFB1)- DNA binding and AFB1-induced glutathione S- transferase placental (GST-P) form positive hepatic foci have been examined in young male Fischer rats. Animals were fed either AIN-76A or Purina Chow (PC) diet for 1 wk before AFB1- DNA binding studies in vivo and in vitro. Animals were injected i.p. with AFB1 (1 mug/kg body wt) and 3 days later were given either AIN-76A or PC diet with or without 0.1% phenobarbital (PB) in their drinking water. All animals were sacrificed 10 wks after AFB1 dosing for analysis of AFB1-induced GST-P positive hepatic foci by immunochemistry. Two h after i.p. injection of AFB1, hepatic AFB1-DNA binding in AIN-76A fed rats was twice as much as those in PC fed animals without affecting GSH levels. There was no significant effect of diet on either cytochrome P-450 content, GSH levels or microsomal cytochrome P-450 mediated AFB1-DNA binding to exogenous DNA. There was a 40% increase in cytosolic GSH S-transferase activity with 1-chloro-2,4-dinitrobenzene as a substrate in PC fed animals compared to those given AIN- 76A diet. The number and area of AFB1-induced GST-P positive hepatic foci were twice and fivefold as much in AIN-76A fed compared to those in PC fed rats. The number of AFB1-induced GST-P positive foci was increased 5-10 fold in the presence of PB in both groups. In summary, the present data indicate that feeding of PC diet compared to AIN-76A diet inhibits the initiation phase whereas AIN-76A stimulates the promotion phase of AFB1 hepatocarcinogenesis in rats by inhibiting AFB1-DNA binding and increasing AFB1-induced hepatic foci respectively.
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Affiliation(s)
- Masatomo Kimura
- Fels Institute for Cancer Research and Molecular Biology, Department of Biochemistry, Temple University School of Medicine, Philadelphia, PA 19140, USA
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Hayder N, Abdelwahed A, Kilani S, Ammar RB, Mahmoud A, Ghedira K, Chekir-Ghedira L. Anti-genotoxic and free-radical scavenging activities of extracts from (Tunisian) Myrtus communis. Mutation Research/Genetic Toxicology and Environmental Mutagenesis 2004; 564:89-95. [PMID: 15474415 DOI: 10.1016/j.mrgentox.2004.08.001] [Citation(s) in RCA: 70] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2004] [Revised: 06/03/2004] [Accepted: 08/11/2004] [Indexed: 10/26/2022]
Abstract
The effect of extracts from leaves of Myrtus communis on the SOS reponse induced by Aflatoxin B1 (AFB1) and Nifuroxazide was investigated in a bacterial assay system, i.e. the SOS chromotest with Escherichia coli PQ37. Aqueous extract, the total flavonoids oligomer fraction (TOF), hexane, chloroform, ethyl acetate and methanol extracts and essential oil obtained from M. communis significantly decreased the SOS response induced by AFB1 (10 microg/assay) and Nifuroxazide (20 microg/assay). Ethyl acetate and methanol extracts showed the strongest inhibition of the induction of the SOS response by the indirectly genotoxic AFB1. The methanol and aqueous extracts exhibited the highest level of protection towards the SOS-induced response by the directly genotoxic Nifuroxazide. In addition to anti-genotoxic activity, the aqueous extract, the TOF, and the ethyl acetate and methanol extracts showed an important free-radical scavenging activity towards the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical. These results suggest the future utilization of these extracts as additives in chemoprevention studies.
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Affiliation(s)
- N Hayder
- Laboratoire de Biochimie et de Biologie Moléculaire, Faculté de Pharmacie de Monastir, Rue Avicenne, 5000 Monastir, Tunisie
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Robichová S, Slamenová D, Gábelová A, Sedlák J, Jakubíková J. An investigation of the genotoxic effects of N -nitrosomorpholine in mammalian cells. Chem Biol Interact 2004; 148:163-71. [PMID: 15276872 DOI: 10.1016/j.cbi.2004.06.002] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/21/2004] [Revised: 06/11/2004] [Accepted: 06/12/2004] [Indexed: 11/24/2022]
Abstract
N-nitrosomorpholine (NMOR) is a well-known hepatocarcinogen. Since this compound is representative of the group of indirect-acting N-nitrosamines, its metabolic activation should be essential. However, the mechanism of NMOR-induced carcinogenesis is still not completely clear. In this paper we tried to further our understanding of the genotoxic effects of NMOR. The central aim of this study was to elucidate to what extent NMOR requires metabolic activation. For evaluation of the mutagenicity of NMOR, V79 cells were used either in the presence or absence of the microsomal S9 fraction in the mutation assay and formation of reactive oxygen/nitrogen species (ROS/RNS) in Caco-2 cells treated with NMOR was measured by a fluorescent assay. A very weak rise of 6-thioguanine resistant mutations was observed in both NMOR-treated model cells, V79/-S9 and V79/+S9. A significant difference between the level of mutations in V79/-S9 and V79/+S9 cells was recorded on the 7th day of expression only. Data obtained by the fluorescent assay confirmed that NMOR caused generation of ROS/RNS. In summary, the presented results showed that NMOR might induce DNA damage not only indirectly by its activation by drug-metabolizing enzymes but also via direct formation of ROS/RNS.
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Affiliation(s)
- Sona Robichová
- Cancer Research Institute, Slovak Academy of Sciences, Vlárska 7, 833 91 Bratislava, Slovak Republic.
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Herzog-Soares JDA, Freire RB. Effect of citrinin and in association with aflatoxin B1 on the infectivity and proliferation of Toxoplasma gondii in vitro. Braz J Infect Dis 2004; 8:101-8. [PMID: 15286881 DOI: 10.1590/s1413-86702004000100007] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Macrophages exposed to 10 mug/mL citrinin (CTR) or 0.01 mug CTR mixed with 0.04 mug aflatoxin B1 (AFB1) for a period of 2 h at 37 masculine C, were infected with 10(6) Toxoplasma gondii tachyzoites/muL. The parasites were treated with mycotoxins (2 h at 37 masculine C) before being added to the macrophage culture. The number of tachyzoites was quantified 2, 24, 48, 72 and 96 h after infection. During the first 2 hours, 59% infectivity was observed in the control. After exposure to CTR or the mixture of toxins (CTR-AFB1), macrophages were infected with 77.5% and 75% of the inoculated tachyzoites, respectively. Similarly, 72.3% of the cells were infected when cultured together with previously treated parasites. The treatment with CTR-AFB1 gave rise to 2.9 times more tachyzoites than the control at 72 h. An increased number of parasites was recovered from macrophages exposed to CTR after 96 h, and to CTR-AFB1 after 72 h of culture; The number of tachyzoites recovered from the supernatant was 1.94 and 2.06 times higher, respectively, than in the control (5 x 10(5) +/- 0.054 /mL).
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Affiliation(s)
- Joanna D'Arc A Herzog-Soares
- Parasitologic Section, Institute of Tropical Pathology and Public Health, Federal University of Goiás, Goiás, GO, Brazil.
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Strelić NJ, Saicić ZS, Magić ZM, Spasić MB, Trutić NV, Krtolica KV. Aflatoxin B1-induced changes of glutathione-S-transferase activity in the plasma and liver of the rat. VOJNOSANIT PREGL 2003; 60:415-20. [PMID: 12958799 DOI: 10.2298/vsp0304415s] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023] Open
Abstract
BACKGROUND The influence of low doses of aflatoxin B1(AFB1) and partial hepatectomy (PH) on glutathione-S-transferase (GST) activity was studied in the plasma and liver of the rat. METHODS The animals were divided into four groups. The first (I) and the second (II) group were treated with AFB1 freshly dissolved in dimethyl sulphoxide (DMSO), and administered as a single intraperitoneal dose of 50 micrograms/rat 24 hrs after the rats had undergone either sham operation or, 40% PH, respectively. The third group (III) of animals was treated with a total dose of 1 mg AFB1-5 days per week during a period of 8 weeks. The non-treated animals were used as controls (C). RESULTS We observed a significant increase of GST activity in the plasma of all experimental groups compared to the controls (C), (p < 0.02 to p < 0.005). In the liver, the GST activity of all experimental groups was also significantly increased, compared to the controls (from p < 0.02 to p < 0.005). CONCLUSION The administration of both single and multiple doses of AFB1 led to long term increase of GST activity in the rat plasma and liver, and partial hepatectomy had no significant effect on this phenomenon.
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Affiliation(s)
- Natasa J Strelić
- Military Medical Academy, Institute for Medical Research, Belgrade
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Zhang YJ, Chen Y, Ahsan H, Lunn RM, Lee PH, Chen CJ, Santella RM. Inactivation of the DNA repair gene O6-methylguanine-DNA methyltransferase by promoter hypermethylation and its relationship to aflatoxin B1-DNA adducts and p53 mutation in hepatocellular carcinoma. Int J Cancer 2003; 103:440-4. [PMID: 12478658 DOI: 10.1002/ijc.10852] [Citation(s) in RCA: 69] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
O(6)-methylguanine-DNA methyltransferase (MGMT) is a repair protein that specifically removes promutagenic alkyl groups from the O(6) position of guanine in DNA. MGMT is transcriptionally silenced by promoter hypermethylation in several human cancers. Methylation-specific PCR (MSP) was used to analyze the MGMT promoter methylation status of 83 hepatocellular carcinomas (HCC) and 2 HCC cell lines (HepG2 and Hep3B). Hypermethylation was detected in 32 of 83 (39%) HCC tissues, but it was not found in either HCC cell line. We also analyzed MGMT expression by immunohistochemical analysis of HCC tissue samples. The presence of aberrant hypermethylation was associated with loss of MGMT protein. The relationship between methylation status and risk factors and tumor markers including environmental exposure to aflatoxin B(1) (AFB(1)), measured as DNA adducts, and status of tumor suppressor gene p53 was also investigated. A statistically significant association was found between MGMT promoter hypermethylation and high level of AFB(1)-DNA adducts in tumor tissues (OR = 5.05, 95% CI = 1.29-19.73). A significant association was also found between methylation and p53 mutation status (OR = 2.97, 95% CI = 1.09-8.11). These results suggest that epigenetic inactivation of MGMT plays an important role in the development of HCC and exposure to environmental carcinogens may be related to altered methylation of genes involved in cancer development. The role of chemical carcinogens in hypermethylation needs further investigation.
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Affiliation(s)
- Yu-Jing Zhang
- Departments of Environmental Health Sciences and Epidemiology, Mailman School of Public Health, Columbia University, 700 West 168th Street, New York, NY 10032, USA
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Tam AS, Devereux TR, Patel AC, Foley JF, Maronpot RR, Massey TE. Perturbations of the Ink4a/Arf gene locus in aflatoxin B1-induced mouse lung tumors. Carcinogenesis 2003; 24:121-32. [PMID: 12538357 DOI: 10.1093/carcin/24.1.121] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Lung tumors from AC3F1 mice treated with aflatoxin B(1) (AFB(1)), were examined for loss of alleles, point mutations and hypermethylation of CpG sites within the promoters of the two genes in the Ink4a/Arf gene locus. Loss of microsatellite alleles in the Ink4a/Arf region occurred in 22 of 74 (30%) AFB(1)-induced lung tumors. Fifty-one of 61 (83%) tumors had at least partial methylation of CpG sites within the p16Ink4a promoter-exon 1alpha region. At least partial methylation of CpG sites was observed in 43 of 49 (88%) tumors analyzed for p19Arf promoter hypermethylation, with methylation of identified transcription factor binding sites or consensus sequences occurring in 21 tumors (DMP1/Ets in two tumors, CTCF in four tumors, E2F in three tumors, Sp1 in 16 tumors). Two tumors contained point mutations in the p19Arf promoter. Nuclear staining for p19(Arf) was decreased by 80-100% in 41 of 71 (58%) tumors. The concordance between p19Arf molecular perturbations and altered protein expression was 63%. However, upon comparing p19Arf promoter perturbations (i.e. methylation of functional transcription factor binding sites and point mutations) and altered p19(Arf) expression, the concordance was 86%, suggesting a mechanism for changes in protein expression in some tumors. There was an absence of a mutually exclusive relationship between disruption of p53 and p19(Arf), since the concordance was 62%. Similarly, no evidence was found of inverse relationships between perturbation of p16Ink4a and p19(Arf) (43% concordance) or p16Ink4(a) and p53 (37% concordance), suggesting that inactivation of these genes occurs independently and provides evidence that, although these genes may participate in cooperative cellular pathways, they also have functions in independent pathways that are important in mouse lung tumorigenesis.
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Affiliation(s)
- Andrew S Tam
- Queen's University, Department of Pharmacology and Toxicology, Kingston, Ontario K7L 3N6, Canada
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Atef M, Youssef SAH, El-Eanna HA, El-Maaz AA. Influence of aflatoxin B1 on the kinetic disposition, systemic bioavailability and tissue residues of doxycycline in chickens. Br Poult Sci 2002; 43:528-32. [PMID: 12365509 DOI: 10.1080/0007166022000004435] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
1. Disposition kinetics of doxycycline (doxy) was studied in healthy chickens and chickens experimentally intoxicated with aflatoxin B1 by intravenous, oral or intramuscular (i.m.) injection, in a single dose of 15 mg/kg body weight. In addition, the tissue distribution and residual pattern of the drug were determined in healthy and intoxicated chickens. 2. The maximum serum concentrations of doxy were reached 1.97 and 2.37 h after oral, and 1.57 and 2.92 h after i.m. dosage in healthy and aflatoxic birds, respectively. 3. The volumes of distribution and total body clearances were higher in aflatoxic birds (1.75 l/kg and 14.61 ml/kg/min) than in healthy chickens (0.93 l/kg and 4.6 ml/kg/min). Data relating to intravenous injection were analysed using a two-compartment open model curve fit. 4. Lower values of systemic bioavailability were observed in intoxicated birds (30.9 and 33.9%) than healthy ones (43.7 and 57.3%) after oral and i.m. administration, respectively. 5. The highest concentration of doxy residues were present in liver, kidney and serum followed by heart and muscles. Doxy residue concentrations in edible tissues was below the EEC limit 6 d after cessation of oral or i.m. medication with 15 mg/kg body weight twice daily for 5 successive days.
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Affiliation(s)
- M Atef
- Department of Pharmacology, Faculty of Veterinary Medicine, Cairo University, Giza, Egypt.
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Raphael KR, Ajith TA, Joseph S, Kuttan R. Anti-mutagenic activity of Phyllanthus amarus Schum & Thonn in vitro as well as in vivo. Teratog Carcinog Mutagen 2002; 22:285-91. [PMID: 12111712 DOI: 10.1002/tcm.10021] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
Methanolic extract of Phyllanthus amarus was tested for its anti-mutagenic activity in Salmonella typhimurium strains TA1535, TA100, and TA102 (Ames test). P. amarus extract was able to inhibit the activation and mutagenicity of 2-acetaminofluorene (2-AAF) and aflatoxinB(1) at concentrations of 0.25-2 mg/plate. It was also found to inhibit mutagenicity induced by direct acting mutagens sodium azide (NaN(3)), N-methyl-N-nitro-N-nitrosoguanidine (MNNG), and 4-nitro-0-phenylenediamine (NPD), at concentrations of 1 mg to 0.25 mg/plate. Urinary mutagenicity produced in rats by benzo[a] pyrene was found to be significantly inhibited by the oral administration of Phyllanthus extract. These results indicate significant anti-mutagenicity of the extract in vitro as well as in vivo.
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Smela ME, Hamm ML, Henderson PT, Harris CM, Harris TM, Essigmann JM. The aflatoxin B(1) formamidopyrimidine adduct plays a major role in causing the types of mutations observed in human hepatocellular carcinoma. Proc Natl Acad Sci U S A 2002; 99:6655-60. [PMID: 12011430 PMCID: PMC124458 DOI: 10.1073/pnas.102167699] [Citation(s) in RCA: 139] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
A G to T mutation has been observed at the third position of codon 249 of the p53 tumor-suppressor gene in over 50% of the hepatocellular carcinoma cases associated with high exposure to aflatoxin B(1) (AFB(1)). Hypotheses have been put forth that AFB(1), in concert with hepatitis B virus (HBV), may play a role in the formation of, and/or the selection for, this mutation. The primary DNA adduct of AFB(1) is 8,9-dihydro-8-(N(7)-guanyl)-9-hydroxyaflatoxin B(1) (AFB(1)-N7-Gua), which is converted naturally to two secondary lesions, an apurinic site and an AFB(1)-formamidopyrimidine (AFB(1)-FAPY) adduct. AFB(1)-FAPY is detected at near maximal levels in rat DNA days to weeks after AFB(1) exposure, underscoring its high persistence in vivo. The present study reveals two striking properties of this DNA adduct: (i) AFB(1)-FAPY was found to cause a G to T mutation frequency in Escherichia coli approximately 6 times higher than that of AFB(1)-N7-Gua, and (ii) one proposed rotamer of AFB(1)-FAPY is a block to replication, even when the efficient bypass polymerase MucAB is used by the cell. Taken together, these characteristics make the FAPY adduct the prime candidate for both the genotoxicity of aflatoxin, because mammalian cells also have similar bypass mechanisms for combating DNA damage, and the mutagenicity that ultimately may lead to liver cancer.
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Affiliation(s)
- Maryann E Smela
- Biological Engineering Division and Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Building 56, Room 669, Cambridge, MA 02139, USA
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