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Walton B, Kaplan N, Hrdlicka B, Mehta K, Arendt LM. Obesity Induces DNA Damage in Mammary Epithelial Cells Exacerbated by Acrylamide Treatment through CYP2E1-Mediated Oxidative Stress. TOXICS 2024; 12:484. [PMID: 39058136 DOI: 10.3390/toxics12070484] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2024] [Revised: 06/20/2024] [Accepted: 06/28/2024] [Indexed: 07/28/2024]
Abstract
Obesity and environmental toxins are risk factors for breast cancer; however, there is limited knowledge on how these risk factors interact to promote breast cancer. Acrylamide, a probable carcinogen and obesogen, is a by-product in foods prevalent in the obesity-inducing Western diet. Acrylamide is metabolized by cytochrome P450 2E1 (CYP2E1) to the genotoxic epoxide, glycidamide, and is associated with an increased risk for breast cancer. To investigate how acrylamide and obesity interact to increase breast cancer risk, female mice were fed a low-fat (LFD) or high-fat diet (HFD) and control water or water supplemented with acrylamide at levels similar to the average daily exposure in humans. While HFD significantly enhanced weight gain in mice, the addition of acrylamide did not significantly alter body weights compared to respective controls. Mammary epithelial cells from obese, acrylamide-treated mice had increased DNA strand breaks and oxidative DNA damage compared to all other groups. In vitro, glycidamide-treated COMMA-D cells showed significantly increased DNA strand breaks, while acrylamide-treated cells demonstrated significantly higher levels of intracellular reactive oxygen species. The knockdown of CYP2E1 rescued the acrylamide-induced oxidative stress. These studies suggest that long-term acrylamide exposure through foods common in the Western diet may enhance DNA damage and the CYP2E1-induced generation of oxidative stress in mammary epithelial cells, potentially enhancing obesity-induced breast cancer risk.
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Affiliation(s)
- Brenna Walton
- Molecular and Environmental Toxicology, University of Wisconsin-Madison, Madison, WI 53715, USA
| | - Noah Kaplan
- Comparative Biosciences, University of Wisconsin-Madison, Madison, WI 53715, USA
| | - Brooke Hrdlicka
- Comparative Biosciences, University of Wisconsin-Madison, Madison, WI 53715, USA
| | - Kavi Mehta
- Comparative Biosciences, University of Wisconsin-Madison, Madison, WI 53715, USA
| | - Lisa M Arendt
- Molecular and Environmental Toxicology, University of Wisconsin-Madison, Madison, WI 53715, USA
- Comparative Biosciences, University of Wisconsin-Madison, Madison, WI 53715, USA
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Alhassan HH, Al-Keridis LA, Ayub H, Alenazy FO, Alruwaili Y, Khan MR, Fatima M, Patel M, Alshammari N, Adnan M, Sahreen S. GC-MS-based profiling and ameliorative potential of Carissa opaca Stapf ex Haines fruit against cardiac and testicular toxicity: An In vivo study. Heliyon 2023; 9:e19324. [PMID: 37664756 PMCID: PMC10469965 DOI: 10.1016/j.heliyon.2023.e19324] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2023] [Revised: 06/26/2023] [Accepted: 08/18/2023] [Indexed: 09/05/2023] Open
Abstract
Fruit of Carissa opaca Stapf ex Haines (C. opaca) is a feed additive and is commonly used against cardiac dysfunction, fever, asthma, diarrhea, gastrointestinal ailments, and skin diseases. In this study, we aimed to evaluate the metabolic profile and antioxidant potential of C. opaca fruit against carbon tetrachloride (CCl4)-induced cardiotoxicity and testicular toxicity in rats. Gas Chromatoghraphy-Mass Spectrometry (GC-MS) analysis of C. opaca fruit for the identification of potential metabolic profile, followed by methanolic extract of C. opaca and its derived fractions including n-hexane, ethyl acetate, chloroform, butanol, and aqueous were used to assess the antioxidant potential of fruits. Ten groups of rats received different treatments and got evaluated for cardiac and testicular antioxidant enzymes, histological architecture, and serum hormonal levels. GC-MS analysis of methanolic extract of C. opaca fruit showed the presence of some bioactive metabolites like cyclodecane, diethyl 2,6-pyridine dicarboxylate, tetrahydro-geraniol, S-[2-[N, N-Dimethylamino]ethyl]morpoline, 2,3-Methylenedioxyphenol, alpha-d-Glucopyranoside, 5,10-Diethoxy-2,3,7,8-tetrahydro-1H, 6H-dipyrrolo [1,2-a; 1',2'-d] pyrazine and 1,3-Benzothiazol-2(3H)-one,3-(3,3-dimethyl-1-oxobutyl) that corresponds the medicinal properties of C. opaca fruit. Prepared fractions of C. opaca fruits mitigated the toxicity induced by CCl4 in the heart and testicular tissues of rats. Oxidative stress was caused by the inhibition of activities of glutathione and other antioxidant enzymes of the body, while on the other hand elevating the levels of nitrite and hydrogen peroxide. Treatment with C. opaca fruit extract normalized the levels of enzymes, reproductive hormones, and free radicals thus restoring the histopathological and enzymatic biomarkers towards the normal group. The study supports the indigenous use of fruits as an alternative medicine against cardiac dysfunction by providing scientific evidence of protection against CCl4-induced injuries, and it also concludes the antioxidant defensive role in testicular tissues.
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Affiliation(s)
- Hassan H. Alhassan
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences-Sakaka, Jouf University, Saudi Arabia
| | - Lamya Ahmed Al-Keridis
- Department of Biology, College of Science, Princess Nourah bint Abdulrahman University, P.O. Box 84428, Riyadh, 11671, Saudi Arabia
| | - Huma Ayub
- Department of Zoology, Mirpur University of Science & Technology, Azad Jammu and Kashmir AJK, Mirpur, Pakistan
| | - Fawaz O. Alenazy
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences-Sakaka, Jouf University, Saudi Arabia
| | - Yasir Alruwaili
- Department of Clinical Laboratory Sciences, College of Applied Medical Sciences-Sakaka, Jouf University, Saudi Arabia
| | - Muhammad Rashid Khan
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - Mehreen Fatima
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - Mitesh Patel
- Research and Development Cell, Department of Biotechnology, Parul Institute of Applied Sciences, Parul University, Vadodara, 391760, India
| | - Nawaf Alshammari
- Department of Biology, College of Science, University of Hail, Hail, P O Box 2440, Saudi Arabia
| | - Mohd Adnan
- Department of Biology, College of Science, University of Hail, Hail, P O Box 2440, Saudi Arabia
| | - Sumaira Sahreen
- Institute for Research in Molecular Medicine (INFORMM), Universiti Sains Malaysia (USM), Pulau Pinang, 11800, Malaysia
- Botanical Sciences Division, Pakistan Museum of Natural History, Garden Avenue, Shakarparian Road, 44000, Islamabad, Pakistan
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Kachot RL, Patel UD, Patel HB, Modi CM, Chauhan R, Kariya MH, Bhadaniya AR. Neurotoxicity of acrylamide in adult zebrafish following short-term and long-term exposure: evaluation of behavior alterations, oxidative stress markers, expression of antioxidant genes, and histological examination of the brain and eyes. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:40116-40131. [PMID: 36607571 DOI: 10.1007/s11356-022-25112-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/25/2022] [Accepted: 12/29/2022] [Indexed: 01/07/2023]
Abstract
In the present work, 224 adult female zebrafish (56 fish in each group) were randomly divided into four groups (two control groups and two toxicity groups) as per duration of exposure (7 and 21 days). All fish of the two toxicity groups were exposed to 0.610 mM acrylamide (ACR) concentration for 7 and 21 days. The effects of ACR exposure on behavior, oxidative stress biomarkers, molecular expression of antioxidant genes (sod, cat, and nrf2), and histopathological examination of the brain and eye were examined. Our result shows that ACR exposure for 7 days produced an anxiety-like behavior in zebrafish. Short-term exposure of ACR resulted in alterations of oxidative stress markers (SOD and CAT activity, and the level of GSH and MDA) in the brain and eye of zebrafish. However, the antioxidant defense system of adult female zebrafish could be able to counteract the free radicals generated in long-term ACR exposure as indicated by non-significant difference in oxidative insult following short-term and long-term exposure. ACR exposure downregulated the mRNA expression of the sod, cat, and nrf2 (nuclear factor erythroid 2-related factor 2) genes in the brain and eye without significant difference between the two toxicity groups. Mild histological changes in the dorsal telencephalic area, tectum opticum, medulla, and hypothalamus area of the brain of zebrafish have been observed following short-term and long-term ACR exposure. In the eye, marked histological changes in the retinal pigmented epithelium layer (RPE), structural changes of the photoreceptor layer (PRL) with disorganized layer of rods and cones, and reduction of the relative thickness of the RPE, PRL, outer nuclear layer (ONL), and inner nuclear layer (INL) have been noted following ACR exposure for 21 days as compared to 7 days. ACR produced neurobehavioral aberrations and oxidative stress within 7 days of exposure, while various histological changes in the brain and eyes have been observed following long-term exposure (21 days) to ACR.
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Affiliation(s)
- Rajesh L Kachot
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Science and Animal Husbandry, Kamdhenu University, Junagadh, 362 001, Gujarat, India
| | - Urvesh D Patel
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Science and Animal Husbandry, Kamdhenu University, Junagadh, 362 001, Gujarat, India.
| | - Harshad B Patel
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Science and Animal Husbandry, Kamdhenu University, Junagadh, 362 001, Gujarat, India
| | - Chirag M Modi
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Science and Animal Husbandry, Kamdhenu University, Junagadh, 362 001, Gujarat, India
| | - RadheyShyam Chauhan
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Science and Animal Husbandry, Kamdhenu University, Junagadh, 362 001, Gujarat, India
| | - Mayank H Kariya
- Department of Veterinary Pharmacology and Toxicology, College of Veterinary Science and Animal Husbandry, Kamdhenu University, Junagadh, 362 001, Gujarat, India
| | - Amit R Bhadaniya
- Department of Veterinary Pathology, College of Veterinary Science and Animal Husbandry, Kamdhenu University, Junagadh, Gujarat, India
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Li Y, Jiang J, Wang Q, Zhu L, Jia W, Chen X, Zhang Y. The construction and application of physiologically based toxicokinetic models for acrylamide, glycidamide and their biomarkers in rats and humans. CHEMOSPHERE 2022; 292:133458. [PMID: 34971622 DOI: 10.1016/j.chemosphere.2021.133458] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 12/24/2021] [Accepted: 12/26/2021] [Indexed: 06/14/2023]
Abstract
Acrylamide (AA), a class 2A probable carcinogen to humans classified by the International Agency for Research on Cancer, has attracted extensive attention worldwide since it was widely used in industrial and domestic water treatment and detected in thermal processing foods. The metabolic adducts of AA and its primary metabolite glycidamide (GA) have been served as biomonitoring markers of AA intake, but the physiologically based toxicokinetics (PBTK) models to estimate internal dosimetry still remain unclear. An updated PBTK model for AA, GA and their metabolic biomarkers in rats and humans was developed and extended with time-course datasets from both literatures and our experiments. With adjustments to the model parameters, linear regression correlation coefficient (R2) between the fitting values and the validation datasets of rats and humans was greater than 0.76. The current model fits well with the experimental datasets of urinary N-acetyl-S-(2-carbamoylethyl)-l-cysteine (AAMA) and (N-(R,S)-acetyl-S-(carbamoyl-2-hydroxyethyl)-l-cysteine) (GAMA) of rats exposed to AA from 0.1 to 50 mg/kg b.w. and humans exposed to AA from 0.0005 to 0.020 mg/kg b.w., indicating the robustness of the current models. Parameters for adduct of AA with N-terminal valine of hemoglobin (AAVal) were extended to humans and validated. Kinetic parameters for rats were assessed and validated based upon fit to the experimental datasets for liver N3-(2-carbamoyl-2-hydroxyethyl)-adenine (N3-GA-Ade) and N7-(2-carbamoyl-2-hydroxyethyl)-guanine (N7-GA-Gua) adducts. Compared with the previous model, the developed model included the correlation between AA intake and its mercapturic acid adducts, AAMA and GAMA, in a larger dose range with new experimental data, and parameters for AAVal, N3-GA-Ade and N7-GA-Gua were improved and verified. The current multi-component PBTK models provide a superior foundation for the estimation of short-term to medium and long-term intake levels of human exposure to AA.
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Affiliation(s)
- Yaoran Li
- College of Biosystems Engineering and Food Science, National-Local Joint Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, Integrated Research Base of Southern Fruit and Vegetable Preservation Technology, Zhejiang International Scientific and Technological Cooperation Base of Health Food Manufacturing and Quality Control, Zhejiang University, Hangzhou, 310058, Zhejiang, China; Fuli Institute of Food Science, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Jiahao Jiang
- College of Biosystems Engineering and Food Science, National-Local Joint Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, Integrated Research Base of Southern Fruit and Vegetable Preservation Technology, Zhejiang International Scientific and Technological Cooperation Base of Health Food Manufacturing and Quality Control, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Qiao Wang
- College of Biosystems Engineering and Food Science, National-Local Joint Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, Integrated Research Base of Southern Fruit and Vegetable Preservation Technology, Zhejiang International Scientific and Technological Cooperation Base of Health Food Manufacturing and Quality Control, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Li Zhu
- College of Biosystems Engineering and Food Science, National-Local Joint Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, Integrated Research Base of Southern Fruit and Vegetable Preservation Technology, Zhejiang International Scientific and Technological Cooperation Base of Health Food Manufacturing and Quality Control, Zhejiang University, Hangzhou, 310058, Zhejiang, China; Fuli Institute of Food Science, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Wei Jia
- College of Biosystems Engineering and Food Science, National-Local Joint Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, Integrated Research Base of Southern Fruit and Vegetable Preservation Technology, Zhejiang International Scientific and Technological Cooperation Base of Health Food Manufacturing and Quality Control, Zhejiang University, Hangzhou, 310058, Zhejiang, China; Fuli Institute of Food Science, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Xinyu Chen
- College of Biosystems Engineering and Food Science, National-Local Joint Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, Integrated Research Base of Southern Fruit and Vegetable Preservation Technology, Zhejiang International Scientific and Technological Cooperation Base of Health Food Manufacturing and Quality Control, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Yu Zhang
- Fuli Institute of Food Science, Zhejiang University, Hangzhou, 310058, Zhejiang, China; Ningbo Research Institute, Zhejiang University, Ningbo, 315100, Zhejiang, China.
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The role of endogenous versus exogenous sources in the exposome of putative genotoxins and consequences for risk assessment. Arch Toxicol 2022; 96:1297-1352. [PMID: 35249149 PMCID: PMC9013691 DOI: 10.1007/s00204-022-03242-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2022] [Accepted: 02/01/2022] [Indexed: 12/21/2022]
Abstract
AbstractThe “totality” of the human exposure is conceived to encompass life-associated endogenous and exogenous aggregate exposures. Process-related contaminants (PRCs) are not only formed in foods by heat processing, but also occur endogenously in the organism as physiological components of energy metabolism, potentially also generated by the human microbiome. To arrive at a comprehensive risk assessment, it is necessary to understand the contribution of in vivo background occurrence as compared to the ingestion from exogenous sources. Hence, this review provides an overview of the knowledge on the contribution of endogenous exposure to the overall exposure to putative genotoxic food contaminants, namely ethanol, acetaldehyde, formaldehyde, acrylamide, acrolein, α,β-unsaturated alkenals, glycation compounds, N-nitroso compounds, ethylene oxide, furans, 2- and 3-MCPD, and glycidyl esters. The evidence discussed herein allows to conclude that endogenous formation of some contaminants appears to contribute substantially to the exposome. This is of critical importance for risk assessment in the cases where endogenous exposure is suspected to outweigh the exogenous one (e.g. formaldehyde and acrolein).
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Pedersen M, Vryonidis E, Joensen A, Törnqvist M. Hemoglobin adducts of acrylamide in human blood - What has been done and what is next? Food Chem Toxicol 2022; 161:112799. [PMID: 34995709 DOI: 10.1016/j.fct.2021.112799] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 12/21/2021] [Accepted: 12/24/2021] [Indexed: 12/12/2022]
Abstract
Acrylamide forms in many commonly consumed foods. In animals, acrylamide causes tumors, neurotoxicity, developmental and reproductive effects. Acrylamide crosses the placenta and has been associated with restriction of intrauterine growth and certain cancers. The impact on human health is poorly understood and it is impossible to say what level of dietary exposure to acrylamide can be deemed safe as the assessment of exposure is uncertain. The determination of hemoglobin (Hb) adducts from acrylamide is increasingly being used to improve the exposure assessment of acrylamide. We aim to outline the literature on Hb adduct levels from acrylamide in humans and discuss methodological issues and research gaps. A total of 86 studies of 27,966 individuals from 19 countries were reviewed. Adduct levels were highest in occupationally exposed individuals and smokers. Levels ranged widely from 3 to 210 pmol/g Hb in non-smokers and this wide range suggests that dietary exposure to acrylamide varies largely. Non-smokers from the US and Canada had slightly higher levels as compared with non-smokers from elsewhere, but differences within studies were larger than between studies. Large studies with exposure assessment of acrylamide and related adduct forming compounds from diet during early-life are encouraged for the evaluation of health effects.
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Affiliation(s)
- Marie Pedersen
- Department of Public Health, University of Copenhagen, Copenhagen, Denmark.
| | | | - Andrea Joensen
- Department of Public Health, University of Copenhagen, Copenhagen, Denmark
| | - Margareta Törnqvist
- Department of Environmental Science, Stockholm University, Stockholm, Sweden
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Zhang Y, Wang Q, Li Y, Cheng J, Chen X, Zhang Y. Comprehensive profile of DNA adducts as both tissue and urinary biomarkers of exposure to acrylamide and chemo-preventive effect of catechins in rats. CHEMOSPHERE 2022; 286:131852. [PMID: 34416594 DOI: 10.1016/j.chemosphere.2021.131852] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/11/2021] [Revised: 08/06/2021] [Accepted: 08/08/2021] [Indexed: 06/13/2023]
Abstract
Two representative DNA adducts from acrylamide exposure, N7-(2-carbamoyl-2-hydroxyethyl) guanine (N7-GA-Gua) and N3-(2-carbamoyl-2-hydroxyethyl) adenine (N3-GA-Ade), are important long-term exposure biomarkers for evaluating genotoxicity of acrylamide. Catechins as natural antioxidants present in tea possess multiple health benefits, and may also have the potential to protect against acrylamide-induced DNA damage. The current study developed an ultra-high performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS) method for simultaneous analysis of N7-GA-Gua and N3-GA-Ade in tissues and urine. The validated UHPLC-MS/MS method showed high sensitivity, with limit of detection and limit of quantification ranging 0.2-0.8 and 0.5-1.5 ng/mL, respectively, and achieved qualified precision (RSD<14.0%) and spiking recovery (87.2%-110.0%) with elution within 6 min, which was suitable for the analysis of the two DNA adducts in different matrices. The levels of N7-GA-Gua and N3-GA-Ade ranged 0.9-11.9 and 0.6-3.5 μg/g creatinine in human urine samples, respectively. To investigate the interventional effects of catechins on the two DNA adducts from acrylamide exposure, rats were supplemented with three types of catechins (tea polyphenols, epigallocatechin gallate, and epicatechin) 30 min before administration with acrylamide. Our results showed that catechins effectively inhibited the formation of DNA adducts from acrylamide exposure in both urine and tissues of rats. Among three catechins, epicatechin performed the best inhibitory effect. The current study provided evidence for the chemo-preventive effect of catechins, indicating that dietary supplement of catechins may contribute to health protection against exposure to acrylamide.
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Affiliation(s)
- Yiju Zhang
- National Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Qiao Wang
- National Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Yaoran Li
- National Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Jun Cheng
- National Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Xinyu Chen
- National Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, 310058, Zhejiang, China
| | - Yu Zhang
- National Engineering Laboratory of Intelligent Food Technology and Equipment, Zhejiang Key Laboratory for Agro-Food Processing, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou, 310058, Zhejiang, China.
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Ogawa B, Nakanishi Y, Wakamatsu M, Takahashi Y, Shibutani M. Repeated administration of acrylamide for 28 days reduces late-stage progenitor cells and immature granule cells accompanying impaired neurite outgrowth in the adult hippocampal neurogenesis in young-adult rats. J Toxicol Sci 2022; 47:467-482. [DOI: 10.2131/jts.47.467] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Bunichiro Ogawa
- Drug Safety and Pharmacokinetics Laboratories, Taisho Pharmaceutical Co., Ltd
| | - Yutaka Nakanishi
- Drug Safety and Pharmacokinetics Laboratories, Taisho Pharmaceutical Co., Ltd
| | - Masaki Wakamatsu
- Drug Safety and Pharmacokinetics Laboratories, Taisho Pharmaceutical Co., Ltd
| | - Yasunori Takahashi
- Laboratory of Veterinary Pathology, Tokyo University of Agriculture and Technology
| | - Makoto Shibutani
- Institute of Global Innovation Research, Tokyo University of Agriculture and Technology
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Acrylamide-induced Changes of Granulopoiesis in Porcine Bone Marrow. J Vet Res 2021; 65:323-327. [PMID: 34917845 PMCID: PMC8643091 DOI: 10.2478/jvetres-2021-0040] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2021] [Accepted: 06/30/2021] [Indexed: 11/20/2022] Open
Abstract
Introduction Due to the widely documented and diverse toxic effects of acrylamide, the authors decided to evaluate the impact of high and low doses of this compound on the process of granulopoiesis in porcine bone marrow. Material and Methods The experiment was conducted on 15 Danish Landrace pigs at the age of 8 weeks. The animals were randomly assigned into three equal groups (n = 5). Control animals received empty gelatine capsules as placebo. Animals in the first experimental group (the LD group) received a low dose of acrylamide of 0.5 μg/kg b.w./day, and animals in the second experimental group (the HD group) received a tenfold higher dose of acrylamide of 5 μg/kg b.w./day. Placebo and acrylamide capsules were administered with feed every morning for 28 days. Bone marrow was collected into tubes without an anticoagulant twice - before the first capsule administration (day 0) and on the 28th day of the study. After drying and staining, bone marrow smears were subjected to detailed cytological evaluation under a light microscope. Results Changes in cell morphology, i.e. degenerative changes in the cellular nuclei, were observed in both experimental groups. Both low and high doses of acrylamide decreased the number of segmented eosinophils, neutrophilic and segmented metamyelocytes, neutrophils, as well as basophils and basophilic metamyelocytes. Conclusion Acrylamide at doses of 0.5 μg/kg b.w./day and 5 μg/kg b.w./day clearly influences porcine granulopoiesis.
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Esokkiya A, Sudalaimani S, Sanjeev Kumar K, Sampathkumar P, Suresh C, Giribabu K. Poly(methylene blue)-Based Electrochemical Platform for Label-Free Sensing of Acrylamide. ACS OMEGA 2021; 6:9528-9536. [PMID: 33869933 PMCID: PMC8047665 DOI: 10.1021/acsomega.0c06315] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/29/2020] [Accepted: 03/22/2021] [Indexed: 05/03/2023]
Abstract
The present work reports the electrochemical sensing of acrylamide (AM) using a poly(methylene blue)-modified glassy carbon electrode (PMB/GCE) where PMB functions as an electrochemical reporter. PMB was prepared by electrochemical polymerization of methylene blue. Electrochemical sensing of AM was facilitated by the interaction between AM and PMB. Further the interaction between AM and PMB was investigated using ultraviolet-visible (UV-vis) spectroscopy and Raman analysis. The surface morphology was confirmed by atomic force microscopy (AFM) and field emission scanning electron microscopy (FESEM) analyses. PMB/GCE was further characterized by X-ray photoelectron spectroscopy (XPS), and the electrochemical performance was assessed using cyclic voltammetry and differential pulse voltammetry. Cyclic voltammetry analysis showed a decrease in current at the redox center of PMB upon addition of AM. The association constant and binding number of AM with PMB/GCE were calculated using differential pulse voltammetry and found to be 8.9 × 106 M-1 and 0.64 (∼1), respectively. The results indicated a strong interaction of AM on the PMB/GCE surface. Further, chronocoulometry analysis of PMB/GCE in the presence of AM showed a decrease in charge due to the interaction of AM with PMB. Under optimized conditions, PMB/GCE exhibited a decrease in current proportional to the concentration of AM in the range of 0.025-16 μM with sensitivity and detection limit 0.252 μA nM-1 and 0.13 nM, respectively. Real sample analysis was carried out by the standard addition method using the solution extracted from potato chips.
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Affiliation(s)
- Anthonysamy Esokkiya
- Electrodics
and Electrocatalysis Division, Central Electrochemical
Research Institute (CSIR-CECRI), Karaikudi, Tamil Nadu 630003, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Sudalaimuthu Sudalaimani
- Electrodics
and Electrocatalysis Division, Central Electrochemical
Research Institute (CSIR-CECRI), Karaikudi, Tamil Nadu 630003, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Kannan Sanjeev Kumar
- Electrodics
and Electrocatalysis Division, Central Electrochemical
Research Institute (CSIR-CECRI), Karaikudi, Tamil Nadu 630003, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Prakasam Sampathkumar
- Electrodics
and Electrocatalysis Division, Central Electrochemical
Research Institute (CSIR-CECRI), Karaikudi, Tamil Nadu 630003, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Chinnathambi Suresh
- Electrodics
and Electrocatalysis Division, Central Electrochemical
Research Institute (CSIR-CECRI), Karaikudi, Tamil Nadu 630003, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Krishnan Giribabu
- Electrodics
and Electrocatalysis Division, Central Electrochemical
Research Institute (CSIR-CECRI), Karaikudi, Tamil Nadu 630003, India
- Academy
of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
- ,
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Revisiting the evidence for genotoxicity of acrylamide (AA), key to risk assessment of dietary AA exposure. Arch Toxicol 2020; 94:2939-2950. [PMID: 32494932 PMCID: PMC7415744 DOI: 10.1007/s00204-020-02794-3] [Citation(s) in RCA: 36] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2020] [Accepted: 05/20/2020] [Indexed: 12/16/2022]
Abstract
The weight of evidence pro/contra classifying the process-related food contaminant (PRC) acrylamide (AA) as a genotoxic carcinogen is reviewed. Current dietary AA exposure estimates reflect margins of exposure (MOEs) < 500. Several arguments support the view that AA may not act as a genotoxic carcinogen, especially not at consumer-relevant exposure levels: Biotransformation of AA into genotoxic glycidamide (GA) in primary rat hepatocytes is markedly slower than detoxifying coupling to glutathione (GS). Repeated feeding of rats with AA containing foods, bringing about uptake of 100 µg/kg/day of AA, resulted in dose x time-related buildup of AA-hemoglobin (Hb) adducts, whereas GA-Hb adducts remained within the background. Since hepatic oxidative biotransformation of AA into GA was proven by simultaneous urinary mercapturic acid monitoring it can be concluded that at this nutritional intake level any GA formed in the liver from AA is quantitatively coupled to GS to be excreted as mercapturic acid in urine. In an oral single dose–response study in rats, AA induced DNA N7-GA-Gua adducts dose-dependently in the high dose range (> 100 µg/kg b w). At variance, in the dose range below 100 µg/kg b.w. down to levels of average consumers exposure, DNA N7 -Gua lesions were found only sporadically, without dose dependence, and at levels close to the lower bound of similar human background DNA N7-Gua lesions. No DNA damage was detected by the comet assay within this low dose range. GA is a very weak mutagen, known to predominantly induce DNA N7-GA-Gua adducts, especially in the lower dose range. There is consensus that DNA N7-GA-Gua adducts exhibit rather low mutagenic potency. The low mutagenic potential of GA has further been evidenced by comparison to preactivated forms of other process-related contaminants, such as N-Nitroso compounds or polycyclic aromatic hydrocarbons, potent food borne mutagens/carcinogens. Toxicogenomic studies provide no evidence supporting a genotoxic mode of action (MOA), rather indicate effects on calcium signalling and cytoskeletal functions in rodent target organs. Rodent carcinogenicity studies show induction of strain- and species-specific neoplasms, with MOAs not considered likely predictive for human cancer risk. In summary, the overall evidence clearly argues for a nongenotoxic/nonmutagenic MOA underlying the neoplastic effects of AA in rodents. In consequence, a tolerable intake level (TDI) may be defined, guided by mechanistic elucidation of key adverse effects and supported by biomarker-based dosimetry in experimental systems and humans.
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12
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Tang Y, Zhang JL. Recent developments in DNA adduct analysis using liquid chromatography coupled with mass spectrometry. J Sep Sci 2019; 43:31-55. [PMID: 31573133 DOI: 10.1002/jssc.201900737] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2019] [Revised: 09/04/2019] [Accepted: 09/27/2019] [Indexed: 12/15/2022]
Abstract
The formation of DNA adducts by genotoxic agents is an early event in cancer development, and it may lead to gene mutations, thereby initiating tumor development. The measurement of DNA adducts can provide critical information about the genotoxic potential of a chemical and its mechanism of carcinogenesis. In recent decades, liquid chromatography coupled with mass spectrometry has become the most important technique for analyzing DNA adducts. The improvements in resolution achievable with new chromatographic separation techniques coupled with the high specificity and sensitivity and wide dynamic range of new mass spectrometry systems have been used for both qualitative and quantitative analyses of DNA adducts. This review discusses the challenges in qualitative and quantitative analyses of DNA adducts by liquid chromatography coupled with mass spectrometry and highlights recent developments towards overcoming the limitations of liquid chromatography coupled with mass spectrometry methods. The key steps and new solutions, such as sample preparation, mass spectrometry fragmentation, and method validation, are summarized. In addition, the fundamental principles and latest advances in DNA adductomic approaches are reviewed.
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Affiliation(s)
- Yu Tang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Peking Union Medical College & Chinese Academy of Medical Sciences, Beijing, P. R. China
| | - Jin-Lan Zhang
- State Key Laboratory of Bioactive Substance and Function of Natural Medicines, Institute of Materia Medica, Peking Union Medical College & Chinese Academy of Medical Sciences, Beijing, P. R. China
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13
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Wang P, Ji R, Ji J, Chen F. Changes of metabolites of acrylamide and glycidamide in acrylamide-exposed rats pretreated with blueberry anthocyanins extract. Food Chem 2019; 274:611-619. [DOI: 10.1016/j.foodchem.2018.08.058] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2018] [Revised: 07/17/2018] [Accepted: 08/13/2018] [Indexed: 12/13/2022]
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14
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Foaud MA, Kamel AH, Abd El-Monem DD. The protective effect of N-acetyl cysteine against carbon tetrachloride toxicity in rats. THE JOURNAL OF BASIC AND APPLIED ZOOLOGY 2018; 79:14. [DOI: 10.1186/s41936-018-0022-x] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Accepted: 01/05/2018] [Indexed: 09/02/2023]
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15
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Hansen SH, Pawlowicz AJ, Kronberg L, Gützkow KB, Olsen AK, Brunborg G. Using the comet assay and lysis conditions to characterize DNA lesions from the acrylamide metabolite glycidamide. Mutagenesis 2018; 33:31-39. [PMID: 29240951 DOI: 10.1093/mutage/gex036] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Abstract
The alkaline comet assay and a cell-free system were used to characterise DNA lesions induced by treatment with glycidamide (GA), a metabolite of the food contaminant acrylamide. DNA lesions induced by GA were sensitively detected when the formamidopyrimidine-DNA-glycosylase (Fpg) enzyme was included in the comet assay. We used LC-MS to characterise modified bases from GA-treated naked DNA with and without subsequent Fpg treatment. N7-GA-Guanine and N3-GA-Adenine aglycons were detected in the supernatant showing some depurination of adducted bases; treatment of naked DNA with Fpg revealed no further increase in the adduct yield nor occurrence of other adducted nucleobases. We treated human lymphocytes with GA and found large differences in DNA lesion levels detected with Fpg, depending on the duration and the pH of the lysis step. These lysis-dependent variations in GA-induced Fpg sensitive sites paralleled those observed after treatment of cells with methyl methane sulfonate (MMS). On the other hand, oxidative lesions (8-oxoGuanine) induced by a photoactive compound (Ro 12-9786) plus light, and also DNA strand breaks induced by X-rays, were detected largely independently of the lysis conditions. The results suggest that the GA-induced lesions are predominantly N7-GA-dG adducts slowly undergoing imidazole ring opening at pH 10 as in the standard lysis procedure; such structures are substrate for Fpg leading to strand breaks. The data suggest that the characteristic alkaline lysis dependence of some DNA lesions may be used to study specific types of DNA modifications. The comet assay is increasingly used in regulatory testing of chemicals; in this context, lysis-dependent variations represent a novel approach to obtain insight in the molecular nature of a genotoxic insult.
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Affiliation(s)
- Siri Helland Hansen
- Department of Molecular Biology, Norwegian Institute of Public Health, Oslo, Norway
| | | | - Leif Kronberg
- Laboratory of Organic Chemistry, Åbo Akademi University, Turku, Finland
| | - Kristine Bjerve Gützkow
- Department of Molecular Biology, Norwegian Institute of Public Health, Oslo, Norway.,Centre for Environmental Radioactivity (CERAD CoE), Ås, Norway
| | - Ann-Karin Olsen
- Department of Molecular Biology, Norwegian Institute of Public Health, Oslo, Norway.,Centre for Environmental Radioactivity (CERAD CoE), Ås, Norway
| | - Gunnar Brunborg
- Department of Molecular Biology, Norwegian Institute of Public Health, Oslo, Norway.,Centre for Environmental Radioactivity (CERAD CoE), Ås, Norway
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16
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Huang YF, Huang CCJ, Lu CA, Chen ML, Liou SH, Chiang SY, Wu KY. Feasibility of using urinary N7-(2-carbamoyl-2-hydroxyethyl) Guanine as a biomarker for acrylamide exposed workers. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2018; 28:589-598. [PMID: 29463903 DOI: 10.1038/s41370-018-0018-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2017] [Revised: 08/25/2017] [Accepted: 09/24/2017] [Indexed: 06/08/2023]
Abstract
Acrylamide (AA), a probable human carcinogen, is a widely-used industrial chemical but is also present in tobacco smoke and carbohydrate-rich foods processed at high temperatures. AA is metabolized to glycidamide (GA) to cause the formation of DNA adducts. N7-(2-carbamoyl-2-hydroxyethyl) guanine (N7-GAG), the most abundant DNA adduct induced by GA, was recently detected in urine of smokers and non-smokers. In this study, we assessed the variability of AA exposure and biomarkers of AA exposure in urine samples repeatedly collected from AA-exposed workers and explored the half-life of N7-GAG. A total of 8 AA-exposed workers and 36 non-exposed workers were recruited. Pre-shift and post-shift urine samples were collected from the exposed group in parallel with personal sampling for eight consecutive days and from the control group on day 1 of the study. Urinary N7-GAG and the mercapturic acids of AA and GA, namely N-acetyl-S-(2-carbamoylethyl)-L-cysteine (AAMA) and N-(R,S)-acetyl-S-(1-carbamoyl-2-hydroxyethyl)-L-cysteine (GAMA) were analyzed using on-line solid phase extraction-liquid chromatography-electrospray ionization/tandem mass spectrometry methods. We found that N7-GAG levels in urine were significantly higher in exposed workers than in controls and that N7-GAG level correlated positively with AAMA and GAMA levels. Results from this study showed that AAMA and GAMA possibly remain the more preferred biomarkers of AA exposure and that N7-GAG levels could be elevated by occupational exposures to AA and serve as a biomarker of AA-induced genotoxicity for epidemiological studies.
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Affiliation(s)
- Yu-Fang Huang
- Department of Safety, Health and Environmental Engineering, National United University, Miaoli, Taiwan
- Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, MA, USA
- Institute of Environmental and Occupational Health Sciences, National Yang Ming University, Taipei, Taiwan
| | - Chih-Chun Jean Huang
- Department of Food Science, National Pingtung University of Science and Technology, Neipu, Pingtung, Taiwan
| | - Chensheng Alex Lu
- Department of Environmental Health, Harvard T.H. Chan School of Public Health, Boston, MA, USA
| | - Mei-Lien Chen
- Institute of Environmental and Occupational Health Sciences, National Yang Ming University, Taipei, Taiwan
| | - Saou-Hsing Liou
- Division of Environmental Health and Occupational Medicine, National Health Research Institutes, Miaoli, Taiwan
| | - Su-Yin Chiang
- School of Chinese Medicine, China Medical University, Taichung, Taiwan
| | - Kuen-Yuh Wu
- Institute of Occupational Medicine and Industrial Hygiene, National Taiwan University, Taipei City, Taiwan.
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17
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Fadl-Allah E, Mahmoud MH, Abd El-Twab M, Helmey R. Aflatoxin B1induces chromosomal aberrations and 5S rDNA alterations in durum wheat. ACTA ACUST UNITED AC 2018. [DOI: 10.1016/j.jaubas.2011.06.002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- E.M. Fadl-Allah
- Botany Department, Faculty of Science, Minia University, Egypt
| | - M.A-H. Mahmoud
- Genetics Department, Faculty of Agriculture, Minia University, Egypt
| | | | - R.K. Helmey
- Botany Department, Faculty of Science, Minia University, Egypt
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18
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Noureen F, Khan MR, Shah NA, Khan RA, Naz K, Sattar S. Pistacia chinensis: Strong antioxidant and potent testicular toxicity amelioration agent. ASIAN PAC J TROP MED 2017; 10:380-389. [PMID: 28552108 DOI: 10.1016/j.apjtm.2017.03.027] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/21/2017] [Revised: 02/20/2017] [Accepted: 03/19/2017] [Indexed: 01/23/2023] Open
Abstract
OBJECTIVES To evaluate in vitro and in vivo antioxidant potency of Pistacia chinensis (P. chinensis) bark and leaves extracts along with its protective role against CCl4 induced toxicity in testis of the rat. METHODS Various in vitro models such as DPPH, ABTS, hydrogen peroxide, superoxide, hydroxyl and nitric oxide scavenging activities, anti-lipid peroxidation activity, phospho-molybdenum activity, β carotene bleaching assay was used for analysis of antioxidant potential. Experimental groups for in vivo study were: Group Ⅰ (control) untreated, Group Ⅱ (Vehicle control), Group Ⅲ (1 mL/kg b.w 30% CCl4), Group Ⅳ (1 mL/kg b.w CCl4 + Silymarin), Group Ⅴ (200 mg/kg b.w PCBE + CCl4), Group Ⅵ (400 mg/kg b.w PCBE + CCl4) and Group Ⅶ (400 mg/kg b.w PCBE alone). RESULTS In vitro antioxidant assays displayed significant results and the highest activity was not specified to a specific extract. However, ethyl acetate extract of bark (PCBE) showed highest results in most of the antioxidant assays i.e. beta-carotene bleaching, hydroxyl radical scavenging, ABTS, lipid peroxidation and superoxide radical scavenging activity. On this base, this fraction was selected for in vivo antioxidant experiment. Testis tissues were analyzed to observe the protective effects of PCBE on antioxidant enzymes; catalase, superoxide dismutase, peroxidase, glutathione-S-transferase, glutathione reductase, glutathione peroxidase and quinone reductase activities and glutathione (GSH) as well as nitrite content. Profile of plasma testosterone was also compared to various treatments. Observation suggests a protective role of P. chinensis against CCl4 induced toxicity. CONCLUSIONS It is concluded that some bioactive antioxidants of P. chinensis bark might be a good source to isolate the potent antioxidant components.
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Affiliation(s)
- Farah Noureen
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - Muhammad Rashid Khan
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan.
| | - Naseer Ali Shah
- Department of Biosciences, COMSATS Institute of Information Technology, Islamabad, Pakistan
| | | | - Kiran Naz
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - Saadia Sattar
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
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19
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Hemeryck LY, Van Hecke T, Vossen E, De Smet S, Vanhaecke L. DNA adductomics to study the genotoxic effects of red meat consumption with and without added animal fat in rats. Food Chem 2017; 230:378-387. [PMID: 28407925 DOI: 10.1016/j.foodchem.2017.02.129] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Revised: 02/14/2017] [Accepted: 02/27/2017] [Indexed: 11/25/2022]
Abstract
Digestion of red and processed meat has been linked to the formation of genotoxic N-nitroso compounds (NOCs) and lipid peroxidation products (LPOs) in the gut. In this study, rats were fed a meat based diet to compare the possible genotoxic effects of red vs. white meat, and the interfering role of dietary fat. To this purpose, liver, duodenum and colon DNA adductomes were analyzed with UHPLC-HRMS. The results demonstrate that the consumed meat type alters the DNA adductome; the levels of 22 different DNA adduct types significantly increased upon the consumption of beef (compared to chicken) and/or lard supplemented beef or chicken. Furthermore, the chemical constitution of the retrieved DNA adducts hint at a direct link with an increase in NOCs and LPOs upon red (and processed) meat digestion, supporting the current hypotheses on the causal link between red and processed meat consumption and the development of colorectal cancer.
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Affiliation(s)
- Lieselot Y Hemeryck
- Laboratory of Chemical Analysis, Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820 Merelbeke, Belgium
| | - Thomas Van Hecke
- Laboratory of Animal Nutrition and Animal Product Quality, Department of Animal Production, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Els Vossen
- Laboratory of Animal Nutrition and Animal Product Quality, Department of Animal Production, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Stefaan De Smet
- Laboratory of Animal Nutrition and Animal Product Quality, Department of Animal Production, Faculty of Bioscience Engineering, Ghent University, Coupure Links 653, B-9000 Ghent, Belgium
| | - Lynn Vanhaecke
- Laboratory of Chemical Analysis, Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Salisburylaan 133, B-9820 Merelbeke, Belgium.
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20
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Shi Q, Maas L, Veith C, Van Schooten FJ, Godschalk RW. Acidic cellular microenvironment modifies carcinogen-induced DNA damage and repair. Arch Toxicol 2016; 91:2425-2441. [PMID: 28005143 PMCID: PMC5429366 DOI: 10.1007/s00204-016-1907-4] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2016] [Accepted: 12/06/2016] [Indexed: 12/08/2022]
Abstract
Chronic inflammation creates an acidic microenvironment, which plays an important role in cancer development. To investigate how low pH changes the cellular response to the carcinogen benzo[a]pyrene (B[a]P), we incubated human pulmonary epithelial cells (A549 and BEAS-2B) with nontoxic doses of B[a]P using culturing media of various pH’s (extracellular pH (pHe) of 7.8, 7.0, 6.5, 6.0 and 5.5) for 6, 24 and 48 h. In most incubations (pHe 7.0–6.5), the pH in the medium returned to the physiological pH 7.8 after 48 h, but at the lowest pH (pHe < 6.0), this recovery was incomplete. Similar changes were observed for the intracellular pH (pHi). We observed that acidic conditions delayed B[a]P metabolism and at t = 48 h, and the concentration of unmetabolized extracellular B[a]P and B[a]P-7,8-diol was significantly higher in acidic samples than under normal physiological conditions (pHe 7.8) for both cell lines. Cytochrome P450 (CYP1A1/CYP1B1) expression and its activity (ethoxyresorufin-O-deethylase activity) were repressed at low pHe after 6 and 24 h, but were significantly higher at t = 48 h. In addition, a DNA repair assay showed that the incision activity was ~80% inhibited for 6 h at low pHe and concomitant exposure to B[a]P. However, at t = 48 h, the incision activity recovered to more than 100% of the initial activity observed at neutral pHe. After 48 h, higher B[a]P-DNA adduct levels and γ-H2AX foci were observed at low pH samples than at pHe 7.8. In conclusion, acidic pH delayed the metabolism of B[a]P and inhibited DNA repair, ultimately leading to increased B[a]P-induced DNA damage.
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Affiliation(s)
- Q Shi
- Department of Pharmacology and Toxicology, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University, PO Box 616, 6200 MD, Maastricht, The Netherlands
| | - L Maas
- Department of Pharmacology and Toxicology, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University, PO Box 616, 6200 MD, Maastricht, The Netherlands
| | - C Veith
- Department of Pharmacology and Toxicology, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University, PO Box 616, 6200 MD, Maastricht, The Netherlands
| | - F J Van Schooten
- Department of Pharmacology and Toxicology, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University, PO Box 616, 6200 MD, Maastricht, The Netherlands
| | - R W Godschalk
- Department of Pharmacology and Toxicology, NUTRIM School for Nutrition and Translational Research in Metabolism, Maastricht University, PO Box 616, 6200 MD, Maastricht, The Netherlands.
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21
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Evaluation of mutagenicity of acrylamide using RBC Pig-a and PIGRET assays by single peroral dose in rats. MUTATION RESEARCH-GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2016; 811:54-59. [DOI: 10.1016/j.mrgentox.2015.12.005] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Accepted: 12/16/2015] [Indexed: 11/22/2022]
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22
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Gutzkow KB, Duale N, Danielsen T, von Stedingk H, Shahzadi S, Instanes C, Olsen AK, Steffensen IL, Hofer T, Törnqvist M, Brunborg G, Lindeman B. Enhanced susceptibility of obese mice to glycidamide-induced sperm chromatin damage without increased oxidative stress. Andrology 2016; 4:1102-1114. [DOI: 10.1111/andr.12233] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2016] [Revised: 04/26/2016] [Accepted: 05/11/2016] [Indexed: 11/29/2022]
Affiliation(s)
- K. B. Gutzkow
- Division of Environmental Medicine; Department of Chemicals and Radiation; Norwegian Institute of Public Health; Oslo Norway
| | - N. Duale
- Division of Environmental Medicine; Department of Chemicals and Radiation; Norwegian Institute of Public Health; Oslo Norway
| | - T. Danielsen
- Division of Environmental Medicine; Department of Chemicals and Radiation; Norwegian Institute of Public Health; Oslo Norway
| | - H. von Stedingk
- Department of Environmental Science and Analytical Chemistry; Stockholm University; Stockholm Sweden
| | - S. Shahzadi
- Division of Environmental Medicine; Department of Chemicals and Radiation; Norwegian Institute of Public Health; Oslo Norway
| | - C. Instanes
- Division of Environmental Medicine; Department of Chemicals and Radiation; Norwegian Institute of Public Health; Oslo Norway
| | - A.-K. Olsen
- Division of Environmental Medicine; Department of Chemicals and Radiation; Norwegian Institute of Public Health; Oslo Norway
| | - I.-L. Steffensen
- Division of Environmental Medicine; Department of Food, Water and Cosmetics; Norwegian Institute of Public Health; Oslo Norway
| | - T. Hofer
- Division of Environmental Medicine; Department of Chemicals and Radiation; Norwegian Institute of Public Health; Oslo Norway
| | - M. Törnqvist
- Department of Environmental Science and Analytical Chemistry; Stockholm University; Stockholm Sweden
| | - G. Brunborg
- Division of Environmental Medicine; Department of Chemicals and Radiation; Norwegian Institute of Public Health; Oslo Norway
| | - B. Lindeman
- Division of Environmental Medicine; Department of Chemicals and Radiation; Norwegian Institute of Public Health; Oslo Norway
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Hobbs CA, Davis J, Shepard K, Chepelev N, Friedman M, Marroni D, Recio L. Differential genotoxicity of acrylamide in the micronucleus andPig-a gene mutation assays in F344 rats and B6C3F1 mice. Mutagenesis 2016; 31:617-626. [DOI: 10.1093/mutage/gew028] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Hemeryck LY, Vanhaecke L. Diet-related DNA adduct formation in relation to carcinogenesis. Nutr Rev 2016; 74:475-89. [PMID: 27330144 DOI: 10.1093/nutrit/nuw017] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022] Open
Abstract
The human diet contributes significantly to the initiation and promotion of carcinogenesis. It has become clear that the human diet contains several groups of natural foodborne chemicals that are at least in part responsible for the genotoxic, mutagenic, and carcinogenic potential of certain foodstuffs. Electrophilic chemicals are prone to attack nucleophilic sites in DNA, resulting in the formation of altered nucleobases, also known as DNA adducts. Since DNA adduct formation is believed to signal the onset of chemically induced carcinogenesis, the DNA adduct-inducing potential of certain foodstuffs has been investigated to gain more insight into diet-related pathways of carcinogenesis. Many studies have investigated diet-related DNA adduct formation. This review summarizes work on known or suspected dietary carcinogens and the role of DNA adduct formation in hypothesized carcinogenesis pathways.
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Affiliation(s)
- Lieselot Y Hemeryck
- L.Y. Hemeryck and L. Vanhaecke are with the Laboratory of Chemical Analysis, Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium.
| | - Lynn Vanhaecke
- L.Y. Hemeryck and L. Vanhaecke are with the Laboratory of Chemical Analysis, Department of Veterinary Public Health and Food Safety, Faculty of Veterinary Medicine, Ghent University, Merelbeke, Belgium
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25
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Collí-Dulá RC, Friedman MA, Hansen B, Denslow ND. Transcriptomics analysis and hormonal changes of male and female neonatal rats treated chronically with a low dose of acrylamide in their drinking water. Toxicol Rep 2016; 3:414-426. [PMID: 28959563 PMCID: PMC5615912 DOI: 10.1016/j.toxrep.2016.03.009] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2016] [Revised: 03/02/2016] [Accepted: 03/16/2016] [Indexed: 12/28/2022] Open
Abstract
Acrylamide is known to produce follicular cell tumors of the thyroid in rats. RccHan Wistar rats were exposed in utero to a carcinogenic dose of acrylamide (3 mg/Kg bw/day) from gestation day 6 to delivery and then through their drinking water to postnatal day 35. In order to identify potential mechanisms of carcinogenesis in the thyroid glands, we used a transcriptomics approach. Thyroid glands were collected from male pups at 10 PM and female pups at 10 AM or 10 PM in order to establish whether active exposure to acrylamide influenced gene expression patterns or pathways that could be related to carcinogenesis. While all animals exposed to acrylamide showed changes in expected target pathways related to carcinogenesis such as DNA repair, DNA replication, chromosome segregation, among others; animals that were sacrificed while actively drinking acrylamide-laced water during their active period at night showed increased changes in pathways related to oxidative stress, detoxification pathways, metabolism, and activation of checkpoint pathways, among others. In addition, thyroid hormones, triiodothyronine (T3) and thyroxine (T4), were increased in acrylamide-treated rats sampled at night, but not in quiescent animals when compared to controls. The data clearly indicate that time of day for sample collection is critical to identifying molecular pathways that are altered by the exposures. These results suggest that carcinogenesis in the thyroids of acrylamide treated rats may ensue from several different mechanisms such as hormonal changes and oxidative stress and not only from direct genotoxicity, as has been assumed to date.
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Key Words
- ADA, adenosine Deaminase
- ADRB2, adrenergic
- ASF1B, anti-Silencing Function 1B Histone Chaperone
- Acrylamide
- BRIP1, BRCA1 Interacting Protein C-Terminal Helicase 1
- BUB1B, BUB1 Mitotic Checkpoint Serine/Threonine Kinase B
- C1QTNF3, C1q and Tumor Necrosis Factor Related Protein 3
- C5, complement Component 5
- CALCR, calcitonin receptor
- CARD9, caspase recruitment domain family
- CCNA2, cyclin A2
- CCNG1, cyclin G1
- CD45, protein tyrosine phosphatase
- CD46, CD46 molecule
- CDC45, cell division cycle 45
- CDCA2, cell division cycle associated 2
- CDCA5, cell division cycle associated 5
- CENPT, centromere protein T
- CFB, complement factor B
- CGA, glycoprotein hormones
- CTLA4, cytotoxic T-lymphocyte-associated protein 4
- DAD1, defender against cell death 1
- DCTPP1, DCTP pyrophosphatase 1
- DNMT3A, DNA (cytosine-5-)-methyltransferase 3 alpha
- DUOX2, dual oxidase 2
- GCG, glucagon
- GCLC, glutamate-cysteine ligase
- GOLGA3, golgin A3
- GSTM1, glutathione S-transferase Mu 1
- GSTP1, glutathione S-transferase Pi 1
- HPSE, heparanase
- HSPA5, heat shock 70 kDa protein 5
- HSPB1, heat shock 27 KDa protein
- HSPB2, heat shock 27 kDa protein 2
- HSPH1, heat shock 105 kDa/110 kDa protein 1
- HTATIP2, HIV-1 tat interactive protein 2
- ID1, inhibitor of DNA binding 1
- IGF2, Insulin-like growth factor 2 (somatomedin A)
- IL1B, interleukin 1
- INHBA, inhibin
- IYD, iodotyrosine deiodinase
- KIF20B, kinesin family member 20B
- KIF22, kinesin family Member 22
- KLK1, kallikrein 1
- LAMA2, laminin, alpha 2
- MCM8, minichromosome maintenance complex component 8
- MIF, macrophage migration inhibitory factor
- MIS18A, MIS18 kinetochore protein A
- NDC80, NDC80 kinetochore complex component
- NPPC, natriuretic peptide precursor C
- NPY, neuropeptide
- NUBP1, nucleotide binding protein 1
- ORC1, origin recognition complex
- PDE3A, phosphodiesterase 3A
- PINK1, PTEN induced putative kinase 1
- PLCD1, phospholipase C
- PLK1, polo-like kinase 1
- POMC, proopiomelanocortin
- PRKAA2, protein kinase
- PRL, prolactin
- PRODH, proline dehydrogenase
- PTGIS, prostaglandin I2 (prostacyclin) synthase
- PTGS1, prostaglandin-endoperoxide synthase 1
- RAB5A, RAB5A
- RAN, ras-related nuclear protein
- RRM2, ribonucleotide reductase M2
- RccHan Wistar
- SCL5A5, solute carrier family 5 (sodium iodide symporter)
- SELP, selectin P (granule membrane protein 140 kDa
- SPAG8, sperm associated antigen 8
- TACC3, transforming
- TBCB, tubulin folding cofactor B
- TFRC, transferrin receptor
- TOP2A, topoisomerase (DNA) II alpha
- TPO, thyroid peroxidase
- TSHR, thyroid stimulating hormone receptor
- TSN, translin
- Thyroid
- Transcriptomics
- VWF, Von Willebrand Factor
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Affiliation(s)
- Reyna Cristina Collí-Dulá
- Department of Physiological Sciences and Center for Environmental and Human Toxicology, University of Florida, Gainesville, FL 32611, USA
| | | | - Benjamin Hansen
- Laboratory of Pharmacology and Toxicology, D-211134, Hamburg, Germany
| | - Nancy D Denslow
- Department of Physiological Sciences and Center for Environmental and Human Toxicology, University of Florida, Gainesville, FL 32611, USA
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Beland FA, Olson GR, Mendoza MCB, Marques MM, Doerge DR. Carcinogenicity of glycidamide in B6C3F1 mice and F344/N rats from a two-year drinking water exposure. Food Chem Toxicol 2015; 86:104-15. [PMID: 26429628 PMCID: PMC5066397 DOI: 10.1016/j.fct.2015.09.017] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2015] [Revised: 09/24/2015] [Accepted: 09/26/2015] [Indexed: 11/19/2022]
Abstract
Acrylamide is a contaminant in baked and fried starchy foods, roasted coffee, and cigarette smoke. Previously we reported that acrylamide is a multi-organ carcinogen in B6C3F1 mice and F344/N rats, and hypothesized that acrylamide is activated to an ultimate carcinogen through metabolism to the epoxide glycidamide. We have now examined the carcinogenic effects of glycidamide administered at 0, 0.0875, 0.175, 0.35 and 0.70 mM in drinking water to the same strains of rodents for two years. In male and female mice, there were significant increases in tumors of the Harderian gland, lung, forestomach, and skin. Female mice also had an increased incidence of tumors of the mammary gland and ovary. In male and female rats, there were significant increases in thyroid gland and oral cavity neoplasms and mononuclear cell leukemia. Male rats also had increases in tumors of the epididymis/testes and heart, while female rats demonstrated increases in tumors of the mammary gland, clitoral gland, and forestomach. A similar spectrum of tumors was obtained in mice and rats administered acrylamide. These data indicate that, under the conditions of these bioassays, acrylamide is efficiently metabolized to glycidamide and that the carcinogenic activity of acrylamide is due to its conversion into glycidamide.
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Affiliation(s)
- Frederick A Beland
- Division of Biochemical Toxicology, National Center for Toxicological Research, Jefferson, AR 72079, United States.
| | - Greg R Olson
- Toxicologic Pathology Associates, National Center for Toxicological Research, Jefferson, AR 72079, United States
| | - Maria C B Mendoza
- Division of Bioinformatics and Biostatistics, National Center for Toxicological Research, Jefferson, AR 72079, United States
| | - M Matilde Marques
- Centro de Química Estrutural, Instituto Superior Técnico, Universidade de Lisboa, 1049-001 Lisboa, Portugal
| | - Daniel R Doerge
- Division of Biochemical Toxicology, National Center for Toxicological Research, Jefferson, AR 72079, United States
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Kovac R, Rajkovic V, Koledin I, Matavulj M. Acrylamide alters glycogen content and enzyme activities in the liver of juvenile rat. Acta Histochem 2015; 117:712-7. [PMID: 26475516 DOI: 10.1016/j.acthis.2015.09.004] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2015] [Revised: 09/17/2015] [Accepted: 09/21/2015] [Indexed: 11/16/2022]
Abstract
Acrylamide (AA) is spontaneously formed in carbohydrate-rich food during high-temperature processing. It is neurotoxic and potentially cancer causing chemical. Its harmful effects on the liver, especially in a young organism, are still to be elucidated. The study aimed to examine main liver histology, its glycogen content and enzyme activities in juvenile rats treated with 25 or 50mg/kg bw of AA for 3 weeks. Liver samples were fixed in formalin, routinely processed for paraffin embedding, sectioning and histochemical staining. Examination of haematoxylin and eosin (H&E)-stained sections showed an increase in the volume of hepatocytes, their nuclei and cytoplasm in both AA-treated groups compared to the control. In Periodic acid-Schiff (PAS)-stained sections in low-dose group was noticed glycogen reduction, while in high-dose group was present its accumulation compared to the control, respectively. Serum analysis showed increased activity of aspartate aminotransferase (AST), and decreased activity of alanine aminotransferase (ALT) in both AA-treated groups, while the activity of alkaline phosphatase (ALP) was increased in low-dose, but decreased in high-dose group compared to the control, respectively. Present results suggest a prominent hepatotoxic potential of AA which might alter the microstructural features and functional status in hepatocytes of immature liver.
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Affiliation(s)
- Renata Kovac
- Department of Biology and Ecology, Faculty of Sciences, University of Novi Sad, Novi Sad, Vojvodina 21000, Serbia.
| | - Vesna Rajkovic
- Department of Biology and Ecology, Faculty of Sciences, University of Novi Sad, Novi Sad, Vojvodina 21000, Serbia.
| | - Ivana Koledin
- Department of Biology and Ecology, Faculty of Sciences, University of Novi Sad, Novi Sad, Vojvodina 21000, Serbia.
| | - Milica Matavulj
- Department of Biology and Ecology, Faculty of Sciences, University of Novi Sad, Novi Sad, Vojvodina 21000, Serbia.
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28
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Katen AL, Roman SD. The genetic consequences of paternal acrylamide exposure and potential for amelioration. Mutat Res 2015; 777:91-100. [PMID: 25989052 DOI: 10.1016/j.mrfmmm.2015.04.008] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/28/2014] [Revised: 03/31/2015] [Accepted: 04/08/2015] [Indexed: 06/04/2023]
Abstract
Acrylamide is a toxin that humans are readily exposed to due to its formation in many carbohydrate rich foods cooked at high temperatures. Acrylamide is carcinogenic, neurotoxic and causes reproductive toxicity when high levels of exposure are reached in mice and rats. Acrylamide induced effects on fertility occur predominantly in males. Acrylamide exerts its reproductive toxicity via its metabolite glycidamide, a product which is only formed via the cytochrome P450 detoxifying enzyme CYP2E1. Glycidamide is highly reactive and forms adducts with DNA. Chronic low dose acrylamide exposure in mice relevant to human exposure levels results in significantly increased levels of DNA damage in terms of glycidamide adducts in spermatocytes, the specific germ cell stage where Cyp2e1 is expressed. Since cells in the later stages of spermatogenesis are unable to undergo DNA repair, and this level of acrylamide exposure causes no reduction in fertility, there is potential for this damage to persist until sperm maturation and fertilisation. Cyp2e1 is also present within epididymal cells, allowing for transiting spermatozoa to be exposed to glycidamide. This could have consequences for future generations in terms of predisposition to diseases such as cancer, with growing indications that paternal DNA damage can be propagated across multiple generations. Since glycidamide is the major contributor to DNA damage, a mechanism for preventing these effects is inhibiting the function of Cyp2e1. Resveratrol is an example of an inhibitor of Cyp2e1 which has shown success in reducing damage caused by acrylamide treatment in mice.
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Affiliation(s)
- Aimee L Katen
- Reproductive Science Group, School of Environmental and Life Sciences, University of Newcastle, Callaghan, New South Wales 2308, Australia
| | - Shaun D Roman
- Reproductive Science Group, School of Environmental and Life Sciences, University of Newcastle, Callaghan, New South Wales 2308, Australia; The Australian Research Council Centre of Excellence in Biotechnology and Development, Callaghan, New South Wales 2308, Australia; The Priority Research Centres for Reproductive Sciences and Chemical Biology, University of Newcastle, Callaghan, New South Wales 2308, Australia.
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29
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JaCVAM-organized international validation study of the in vivo rodent alkaline comet assay for the detection of genotoxic carcinogens: I. Summary of pre-validation study results. MUTATION RESEARCH-GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2015. [DOI: 10.1016/j.mrgentox.2015.04.011] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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30
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Pan X, Zhu L, Lu H, Wang D, Lu Q, Yan H. Melatonin Attenuates Oxidative Damage Induced by Acrylamide In Vitro and In Vivo. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2015:703709. [PMID: 26185593 PMCID: PMC4491391 DOI: 10.1155/2015/703709] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Revised: 05/30/2015] [Accepted: 06/04/2015] [Indexed: 02/07/2023]
Abstract
Acrylamide (ACR) has been classified as a neurotoxic agent in animals and humans. Melatonin (MT) has been shown to be potentially effective in preventing oxidative stress related neurodegenerative disorders. In this study, whether MT exerted a protective effect against ACR-induced oxidative damage was investigated. Results in cells showed that reactive oxygen species (ROS) and malondialdehyde (MDA) significantly increased after ACR treatment for 24 h. MT preconditioning or cotreatment with ACR reduced ROS and MDA products, whereas the inhibitory effect of MT on oxidant generation was attenuated by blocking the MT receptor. Increased DNA fragmentation caused by ACR was significantly decreased by MT coadministration. In vivo, rats at 40 mg/kg/day ACR by gavage for 12 days showed weight loss and gait abnormality, Purkinje cell nuclear condensation, and DNA damage in rat cerebellum. MT (i.p) cotreatment with ACR not only recovered weight and gait of rats, but also decreased nuclear condensation and DNA damage in rat cerebellum. Using MDA generation, glutathione (GSH) level, superoxide dismutase (SOD), and glutathione peroxidase (GSH-Px) activities in rat cerebellum as indicators, MT alleviated ACR-induced lipid peroxidation and depressed antioxidant capacity. Our results suggest that MT effectively prevents oxidative damage induced by ACR.
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Affiliation(s)
- Xiaoqi Pan
- Department of Health Toxicology, MOE Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
- Institute for Environmental Medicine, MOE Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Lanlan Zhu
- Sanya Center for Disease Control and Prevention, Hainan 572000, China
| | - Huiping Lu
- Shanghai Songjiang District Center for Disease Control and Prevention, Shanghai 200000, China
| | - Dun Wang
- Department of Health Toxicology, MOE Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Qing Lu
- Institute for Environmental Medicine, MOE Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
| | - Hong Yan
- Department of Health Toxicology, MOE Key Lab of Environment and Health, School of Public Health, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430030, China
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32
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Sahreen S, Khan MR, Khan RA, Alkreathy HM. Cardioprotective role of leaves extracts of Carissa opaca against CCl4 induced toxicity in rats. BMC Res Notes 2014; 7:224. [PMID: 24716654 PMCID: PMC3983670 DOI: 10.1186/1756-0500-7-224] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Accepted: 03/28/2014] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Carissa opaca are used traditionally in Pakistan for the treatment of various human ailments. Therefore, the study is arranged out to assess the cardio protective potential of different fractions of Carissa opaca leaves on CCl4-induced oxidative trauma in kidney. METHODS The parameters studied in this respect were the cardiac function test (CK (U/l), CKMB (U/l), genotoxicity (% DNA fragmentation), characteristic morphological findings and antioxidant enzymatic level of cardiac tissue homogenate. RESULT The protective effects of various fractions of Carissa opaca (C. opaca) leaves extract against CCl4 administration was reviewed by rat cardiac functions alterations. Chronic toxicity caused by eight week treatment of CCl4 to the rats significantly changed the cardiac function test, decreased the activities of antioxidant enzymes and glutathione contents whereas significant increase was found in lipid peroxidation comparative to control group. Administration of various fractions of C. opaca leaves extract with CCl4 showed protective ability against CCl4 intoxication by restoring the cardiac functions alterations, activities of antioxidant enzymes and lipid peroxidation in rat. CCl4 induction in rats also caused DNA fragmentation and histopathalogical abnormalities which were restored by co-admistration of various fraction of C. opaca leaves extract. CONCLUSION Results revealed that various fraction of C. opaca are helpful in cardiac dysfunctions.
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Affiliation(s)
- Sumaira Sahreen
- Botanical Sciences Division, Pakistan Museum of Natural History, Islamabad, Pakistan
| | - Muhammad Rashid Khan
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - Rahmat Ali Khan
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
- Department of Biotechnology, Faculty of Sciences, University of Science and Technology, Bannu, Pakistan
| | - Huda Mohammed Alkreathy
- Department of Pharmacology, Faculty of Medicine, King Abdulaziz University, Jeddah, Saudi Arabia
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Jangir BL, Mahaprabhu R, Rahangadale S, Bhandarkar AG, Kurkure NV. Neurobehavioral alterations and histopathological changes in brain and spinal cord of rats intoxicated with acrylamide. Toxicol Ind Health 2013; 32:526-40. [DOI: 10.1177/0748233713505893] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
The aim of this project was to study the clinical manifestations, neurobehavioral, hematobiochemical, oxidative stress, genotoxicity, and histopathological changes during acrylamide toxicity in rats. A total of 30 adult male Wistar rats were divided in 5 equal groups and received 0, 10, 15, and 20 mg/kg body weight acrylamide as oral gavage, while group 5 was micronucleus (MN) control. Functional observational battery (FOB) parameters were studied at the 28th day of post treatment. Toxicological manifestations were evident in acrylamide-treated rats from 14th day onward. FOB revealed a significant change in central nervous system, neuromuscular, and autonomic domains. The hematological changes include significant decrease in concentration of hemoglobin, total erythrocyte count, packed cell volume, and mean corpuscular volume. The biochemical parameters aspartate aminotransferases, alkaline phosphatase, and albumin showed significant increase, while the levels of serum globulin and glucose were found to decrease significantly. The MN assay revealed the significant increase in frequencies of micronuclei and number of polychromatic erythrocytes. The oxidative stress parameters revealed no significant difference as compared to control rats. Histopathological changes observed in brain include neuronal degeneration, edema, and congestion, while spinal cord revealed demyelination in low-dose group and bilateral necrosis with malacia, liquefaction of white matter, and loss of myelin from gray matter in high-dose groups. The result indicates pathological alterations in brain and spinal cord and is responsible for neurobehavioral changes in rats. The FOB changes and histopathological alterations in spinal cord are in dose dependent to acrylamide intoxication. Various toxicological effects observed in experiment direct us to focus on a deep study and evaluate the possible causes pertaining to toxicity of this chemical. It would furnish the scientists with better options that would help them to search for a median path regarding the use of this chemical and take preventive measures to save the living beings from the hidden disasters of this chemical.
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Affiliation(s)
- Babu Lal Jangir
- Department of Veterinary Pathology, Nagpur Veterinary College, Maharashtra Animal and Fishery Sciences University, Nagpur, India
| | - R Mahaprabhu
- Department of Veterinary Pathology, Nagpur Veterinary College, Maharashtra Animal and Fishery Sciences University, Nagpur, India
| | - Santosh Rahangadale
- Department of Veterinary Pathology, Nagpur Veterinary College, Maharashtra Animal and Fishery Sciences University, Nagpur, India
| | - Arun G Bhandarkar
- Department of Veterinary Pathology, Nagpur Veterinary College, Maharashtra Animal and Fishery Sciences University, Nagpur, India
| | - Nitin V Kurkure
- Department of Veterinary Pathology, Nagpur Veterinary College, Maharashtra Animal and Fishery Sciences University, Nagpur, India
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Sahreen S, Khan MR, Khan RA, Shah NA. Effect of Carissa opaca leaves extract on lipid peroxidation, antioxidant activity and reproductive hormones in male rats. Lipids Health Dis 2013; 12:90. [PMID: 23786717 PMCID: PMC3702457 DOI: 10.1186/1476-511x-12-90] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2013] [Accepted: 06/13/2013] [Indexed: 12/04/2022] Open
Abstract
BACKGROUND Carissa opaca leaves are traditionally used in the treatment of male dysfunction and hormonal disorder as well as in oxidative stress in Pakistan and Asia. The present study was designed to assess the protective effects of methanolic extract of Carissa opaca leaves (MLC) on carbon tetrachloride (CCl4)-induced reproductive stress in male rats and bioactive constituents responsible for the activity. METHODS CCl4 was induced in 42 male rats for eight weeks and checked the protective efficacy of methanolic extract of Carissa opaca leaves at various hormonal imbalances, alteration of antioxidant enzymes, DNA fragmentation levels and lipid peroxidation caused testicular fibrosis in testis while High performance Liquid Chromatography (HPLC) was used for detection of bioactive components. RESULTS HPLC characterization revealed the presence of isoquercitin, hyperoside, vitexin, myricetin and kaempherol. CCl4 caused significant alteration in the secretion of reproductive hormones. Activity of antioxidant enzymes viz; catalase, superoxide dimutase and phase II metabolizing enzymes including glutathione peroxidase, glutathione reductase and reduced glutathione was decreased while DNA fragmentation, hydrogen per oxide contents and thiobarbituric acid reactive substances (TBARS) were increased with CCl4 treatment. Co-administration of 100 mg/kg and 200 mg/kg b.w. MLC effectively ameliorated the alterations in the biochemical markers; hormonal and molecular levels. CONCLUSION Protective effects of methanolic extract of Carissa opaca against CCl4-induced antioxidant and hormonal dysfunction which might be due to bioactive compound present in extract.
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Affiliation(s)
- Sumaira Sahreen
- Botanical Sciences Division, Pakistan Museum of Natural History, Garden Avenue, Shakarparian, Islamabad, Pakistan
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - Muhammad Rashid Khan
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
| | - Rahmat Ali Khan
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
- Department of Biotechnology, Faculty of Biological Sciences, University of Science and Technology Bannu, Khyber Pakhtunkhwa, KPK 28100, Pakistan
| | - Naseer Ali Shah
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad, Pakistan
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Sahreen S, Khan MR, Khan RA. Ameliorating effect of various fractions of Rumex hastatus roots against hepato- and testicular toxicity caused by CCl4. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2013; 2013:325406. [PMID: 23766852 PMCID: PMC3666267 DOI: 10.1155/2013/325406] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/14/2013] [Revised: 04/04/2013] [Accepted: 04/04/2013] [Indexed: 01/06/2023]
Abstract
Effect of methanolic extract of Rumex hastatus roots (MRR) and its derived fractions, n-hexane (HRR), ethyl acetate (ERR), chloroform (CRR), butanol (BRR), and aqueous extract (ARR), was studied against carbon tetrachloride (CCl4) induced hepato and testicular toxicity in rats. Intraperitoneal dose of 20 percent CCl4 (0.5 ml/kg bw) was administered twice a week for eight weeks to a group of rats. Other groups were given CCl4 and various fractions of R. hastatus roots (200 mg/kg bw). CCl4 treatment depleted glutathione contents and activities of antioxidant enzymes while increased the concentration of lipid peroxides (TBARS) along with corresponding DNA injuries and histopathological damages. Supplementation with various fractions of R. hastatus roots (200 mg/kg body weight) attenuated the toxicity of CCl4 in liver and testis tissues through improvement in the serological, enzymatic, and histological parameters towards the normal. Posttreatment of R. hastatus roots (200 mg/kg body weight) also reversed the alteration in reproductive hormonal secretions and DNA damages in CCl4 treated rats. The results clearly demonstrated that R. hastatus treatment augments the antioxidants defense mechanism and provides the evidence that it may have a therapeutic role in free radical mediated diseases.
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Affiliation(s)
- Sumaira Sahreen
- Botanical Sciences Division, Pakistan Museum of Natural History, Garden Avenue, Shakarparian, Islamabad, Pakistan
| | - Muhammad Rashid Khan
- Department of Biochemistry, Faculty of Biological Sciences, Quaid-i-Azam University, Islamabad 45320, Pakistan
| | - Rahmat Ali Khan
- Department of Biotechnology, Faculty of Biological Sciences, University of Science and Technology, Bannu, Khyber Pakhtunkhwa 28100, Pakistan
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36
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Beland FA, Mellick PW, Olson GR, Mendoza MC, Marques MM, Doerge DR. Carcinogenicity of acrylamide in B6C3F1 mice and F344/N rats from a 2-year drinking water exposure. Food Chem Toxicol 2013; 51:149-59. [DOI: 10.1016/j.fct.2012.09.017] [Citation(s) in RCA: 80] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2012] [Revised: 09/12/2012] [Accepted: 09/13/2012] [Indexed: 01/29/2023]
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Toker A, Yerlikaya FH, Yener Y, Toy H. Serum homocysteine, arginine, citrulline and asymmetric dimethyl arginine levels, and histopathologic examination of the abdominal aorta in rats exposed to acrylamide. Biotech Histochem 2012; 88:103-8. [DOI: 10.3109/10520295.2012.745950] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Imai T, Kitahashi T. A 13-week toxicity study of acrylamide administered in drinking water to hamsters. J Appl Toxicol 2012; 34:57-65. [DOI: 10.1002/jat.2831] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Revised: 09/08/2012] [Accepted: 09/08/2012] [Indexed: 01/20/2023]
Affiliation(s)
- Toshio Imai
- Central Animal Division; National Cancer Center Research Institute; 5-1-1 Tsukiji, Chuo-ku Tokyo 104-0045 Japan
| | - Tsukasa Kitahashi
- Central Animal Division; National Cancer Center Research Institute; 5-1-1 Tsukiji, Chuo-ku Tokyo 104-0045 Japan
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Carrasquer CA, Malik N, States G, Qamar S, Cunningham S, Cunningham A. Chemical structure determines target organ carcinogenesis in rats. SAR AND QSAR IN ENVIRONMENTAL RESEARCH 2012; 23:775-795. [PMID: 23066888 PMCID: PMC3547634 DOI: 10.1080/1062936x.2012.728996] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
SAR models were developed for 12 rat tumour sites using data derived from the Carcinogenic Potency Database. Essentially, the models fall into two categories: Target Site Carcinogen-Non-Carcinogen (TSC-NC) and Target Site Carcinogen-Non-Target Site Carcinogen (TSC-NTSC). The TSC-NC models were composed of active chemicals that were carcinogenic to a specific target site and inactive ones that were whole animal non-carcinogens. On the other hand, the TSC-NTSC models used an inactive category also composed of carcinogens but to any/all other sites but the target site. Leave one out (LOO) validations produced an overall average concordance value for all 12 models of 0.77 for the TSC-NC models and 0.73 for the TSC-NTSC models. Overall, these findings suggest that while the TSC-NC models are able to distinguish between carcinogens and non-carcinogens, the TSC-NTSC models are identifying structural attributes that associate carcinogens to specific tumour sites. Since the TSC-NTSC models are composed of active and inactive compounds that are genotoxic and non-genotoxic carcinogens, the TSC-NTSC models may be capable of deciphering non-genotoxic mechanisms of carcinogenesis. Together, models of this type may also prove useful in anticancer drug development since they essentially contain chemical moieties that target a specific tumour site.
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Affiliation(s)
- C. A. Carrasquer
- James Graham Brown Cancer Center, University of Louisville, Louisville, KY 40202
| | - N. Malik
- James Graham Brown Cancer Center, University of Louisville, Louisville, KY 40202
| | - G. States
- James Graham Brown Cancer Center, University of Louisville, Louisville, KY 40202
| | - S. Qamar
- James Graham Brown Cancer Center, University of Louisville, Louisville, KY 40202
| | - S.L. Cunningham
- James Graham Brown Cancer Center, University of Louisville, Louisville, KY 40202
| | - A.R. Cunningham
- James Graham Brown Cancer Center, University of Louisville, Louisville, KY 40202
- Department of Medicine, University of Louisville, Louisville, KY 40202
- Department of Pharmacology and Toxicology, University of Louisville, Louisville, KY 40202
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Watzek N, Böhm N, Feld J, Scherbl D, Berger F, Merz KH, Lampen A, Reemtsma T, Tannenbaum SR, Skipper PL, Baum M, Richling E, Eisenbrand G. N7-glycidamide-guanine DNA adduct formation by orally ingested acrylamide in rats: a dose-response study encompassing human diet-related exposure levels. Chem Res Toxicol 2012; 25:381-90. [PMID: 22211389 DOI: 10.1021/tx200446z] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Acrylamide (AA) is formed during the heating of food and is classified as a genotoxic carcinogen. The margin of exposure (MOE), representing the distance between the bench mark dose associated with 10% tumor incidence in rats and the estimated average human exposure, is considered to be of concern. After ingestion, AA is converted by P450 into the genotoxic epoxide glycidamide (GA). GA forms DNA adducts, primarily at N7 of guanine (N7-GA-Gua). We performed a dose-response study with AA in female Sprague-Dawley (SD) rats. AA was given orally in a single dosage of 0.1-10 000 μg/kg bw. The formation of urinary mercapturic acids and of N7-GA-Gua DNA adducts in liver, kidney, and lung was measured 16 h after application. A mean of 37.0 ± 11.5% of a given AA dose was found as mercapturic acids (MAs) in urine. MA excretion in urine of untreated controls indicated some background exposure from endogenous AA. N7-GA-Gua adduct formation was not detectable in any organ tested at 0.1 μg AA/kg bw. At a dose of 1 μg/kg bw, adducts were found in kidney (around 1 adduct/10(8) nucleotides) and lung (below 1 adduct/10(8) nucleotides) but not in liver. At 10, respectively, 100 μg/kg bw, adducts were found in all three organs, at levels close to those found at 1 μg AA/kg, covering a range of about 1-2 adducts/10(8) nucleotides. As compared to DNA adduct levels from electrophilic genotoxic agents of various origin found in human tissues, N7-GA-Gua adduct levels within the dose range of 0.1-100 μg AA/kg bw were at the low end of this human background. We propose to take the background level of DNA lesions in humans more into consideration when doing risk assessment of food-borne genotoxic carcinogens.
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Affiliation(s)
- Nico Watzek
- Department of Chemistry, Division of Food Chemistry and Toxicology, University of Kaiserslautern , Erwin-Schroedinger-Strasse 52, 67663 Kaiserslautern, Germany
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Preconceptional paternal glycidamide exposure affects embryonic gene expression: Single embryo gene expression study following in vitro fertilization. Reprod Toxicol 2011; 32:463-71. [DOI: 10.1016/j.reprotox.2011.09.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2011] [Revised: 08/10/2011] [Accepted: 09/17/2011] [Indexed: 11/18/2022]
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Qiu Y, Qu X, Dong J, Ai S, Han R. Electrochemical detection of DNA damage induced by acrylamide and its metabolite at the graphene-ionic liquid-Nafion modified pyrolytic graphite electrode. JOURNAL OF HAZARDOUS MATERIALS 2011; 190:480-485. [PMID: 21497017 DOI: 10.1016/j.jhazmat.2011.03.071] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2010] [Revised: 03/17/2011] [Accepted: 03/21/2011] [Indexed: 05/30/2023]
Abstract
A new electrochemical biosensor for directly detecting DNA damage induced by acrylamide (AA) and its metabolite was presented in this work. The graphene-ionic liquid-Nafion modified pyrolytic graphite electrode (PGE) was prepared, and then horseradish peroxidase (HRP) and natural double-stranded DNA were alternately assembled on the modified electrode by the layer-by-layer method. The PGE/graphene-ionic liquid-Nafion and the construction of the (HRP/DNA)(n) film were characterized by electrochemical impedance spectroscopy. With the guanine signal in DNA as an indicator, the damage of DNA was detected by differential pulse voltammetry after PGE/graphene-ionic liquid-Nafion/(HRP/DNA)(n) was incubated in AA solution or AA+H(2)O(2) solution at 37°C. This method provides a new model to mimic and directly detect DNA damage induced by chemical pollutants and their metabolites in vitro. The results indicated that, in the presence of H(2)O(2), HRP was activated and catalyzed the transformation of AA to glycidamide, which could form DNA adducts and induce more serious damage of DNA than AA. In order to further verify these results, UV-vis spectrophotometry was also used to investigate DNA damage induced by AA and its metabolites in solution and the similar results were obtained.
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Affiliation(s)
- Yanyan Qiu
- College of Chemistry and Material Science, Shandong Agricultural University, Daizong Street 61, Taian 271018, Shandong, China
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Takami S, Imai T, Cho YM, Ogawa K, Hirose M, Nishikawa A. Juvenile rats do not exhibit elevated sensitivity to acrylamide toxicity after oral administration for 12 weeks. J Appl Toxicol 2011; 32:959-67. [DOI: 10.1002/jat.1686] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2010] [Revised: 03/10/2011] [Accepted: 03/11/2011] [Indexed: 11/08/2022]
Affiliation(s)
- Shigeaki Takami
- Division of Pathology; National Institute of Health Sciences; 1-18-1 Kamiyoga, Setagaya-ku; Tokyo; 158-8501; Japan
| | | | - Young-Man Cho
- Division of Pathology; National Institute of Health Sciences; 1-18-1 Kamiyoga, Setagaya-ku; Tokyo; 158-8501; Japan
| | - Kumiko Ogawa
- Division of Pathology; National Institute of Health Sciences; 1-18-1 Kamiyoga, Setagaya-ku; Tokyo; 158-8501; Japan
| | - Masao Hirose
- Division of Pathology; National Institute of Health Sciences; 1-18-1 Kamiyoga, Setagaya-ku; Tokyo; 158-8501; Japan
| | - Akiyoshi Nishikawa
- Division of Pathology; National Institute of Health Sciences; 1-18-1 Kamiyoga, Setagaya-ku; Tokyo; 158-8501; Japan
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Berger FI, Feld J, Bertow D, Eisenbrand G, Fricker G, Gerhardt N, Merz KH, Richling E, Baum M. Biological effects of acrylamide after daily ingestion of various foods in comparison to water: A study in rats. Mol Nutr Food Res 2010; 55:387-99. [DOI: 10.1002/mnfr.201000234] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/21/2010] [Revised: 07/18/2010] [Accepted: 08/03/2010] [Indexed: 12/14/2022]
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Inagaki S, Hirashima H, Esaka Y, Higashi T, Min JZ, Toyo’oka T. Screening DNA Adducts by LC–ESI–MS–MS: Application to Screening New Adducts Formed from Acrylamide. Chromatographia 2010. [DOI: 10.1365/s10337-010-1783-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Chen X, Zhang Y, Yu F, Wang H. DFT Calculations on Hydrogen-Bonded Complexes Formed Between Guanine and Acrylamide. J SOLUTION CHEM 2010. [DOI: 10.1007/s10953-010-9588-8] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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47
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Rothfuss A, O'Donovan M, De Boeck M, Brault D, Czich A, Custer L, Hamada S, Plappert-Helbig U, Hayashi M, Howe J, Kraynak AR, van der Leede BJ, Nakajima M, Priestley C, Thybaud V, Saigo K, Sawant S, Shi J, Storer R, Struwe M, Vock E, Galloway S. Collaborative study on fifteen compounds in the rat-liver Comet assay integrated into 2- and 4-week repeat-dose studies. Mutat Res 2010; 702:40-69. [PMID: 20656055 DOI: 10.1016/j.mrgentox.2010.07.006] [Citation(s) in RCA: 82] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2010] [Revised: 06/14/2010] [Accepted: 06/24/2010] [Indexed: 11/28/2022]
Abstract
A collaborative trial was conducted to evaluate the possibility of integrating the rat-liver Comet assay into repeat-dose toxicity studies. Fourteen laboratories from Europe, Japan and the USA tested fifteen chemicals. Two chemicals had been previously shown to induce micronuclei in an acute protocol, but were found negative in a 4-week Micronucleus (MN) Assay (benzo[a]pyrene and 1,2-dimethylhydrazine; Hamada et al., 2001); four genotoxic rat-liver carcinogens that were negative in the MN assay in bone marrow or blood (2,6-dinitrotoluene, dimethylnitrosamine, 1,2-dibromomethane, and 2-amino-3-methylimidazo[4,5-f]quinoline); three compounds used in the ongoing JaCVAM (Japanese Center for the Validation of Alternative Methods) validation study of the acute liver Comet assay (2,4-diaminotoluene, 2,6-diaminotoluene and acrylamide); three pharmaceutical-like compounds (chlordiazepoxide, pyrimethamine and gemifloxacin), and three non-genotoxic rodent liver carcinogens (methapyrilene, clofibrate and phenobarbital). Male rats received oral administrations of the test compounds, daily for two or four weeks. The top dose was meant to be the highest dose producing clinical signs or histopathological effects without causing mortality, i.e. the 28-day maximum tolerated dose. The liver Comet assay was performed according to published recommendations and following the protocol for the ongoing JaCVAM validation trial. Laboratories provided liver Comet assay data obtained at the end of the long-term (2- or 4-week) studies together with an evaluation of liver histology. Most of the test compounds were also investigated in the liver Comet assay after short-term (1-3 daily) administration to compare the sensitivity of the two study designs. MN analyses were conducted in bone marrow or peripheral blood for most of the compounds to determine whether the liver Comet assay could complement the MN assay for the detection of genotoxins after long-term treatment. Most of the liver genotoxins were positive and the three non-genotoxic carcinogens gave negative result in the liver Comet assay after long-term administration. There was a high concordance between short- and long-term Comet assay results. Most compounds when tested up to the maximum tolerated dose were correctly detected in both short- and long-term studies. Discrepant results were obtained with 2,6 diaminotoluene (negative in the short-term, but positive in the long-term study), phenobarbital (positive in the short-term, but negative in the long-term study) and gemifloxacin (positive in the short-term, but negative in the long-term study). The overall results indicate that the liver Comet assay can be integrated within repeat-dose toxicity studies and efficiently complements the MN assay in detecting genotoxins. Practical aspects of integrating genotoxicity endpoints into repeat-dose studies were evaluated, e.g. by investigating the effect of blood sampling, as typically performed during toxicity studies, on the Comet and MN assays. The bleeding protocols used here did not affect the conclusions of the Comet assay or of the MN assays in blood and bone marrow. Although bleeding generally increased reticulocyte frequencies, the sensitivity of the response in the MN assay was not altered. These findings indicate that all animals in a toxicity study (main-study animals as well as toxicokinetic (TK) satellite animals) could be used for evaluating genotoxicity. However, possible logistical issues with scheduling of the necropsies and the need to conduct electrophoresis promptly after tissue sampling suggest that the use of TK animals could be simpler. The data so far do not indicate that liver proliferation or toxicity confound the results of the liver Comet assay. As was also true for other genotoxicity assays, criteria for evaluation of Comet assay results and statistical analyses differed among laboratories. Whereas comprehensive advice on statistical analysis is available in the literature, agreement is needed on applying consistent criteria.
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Affiliation(s)
- Andreas Rothfuss
- Bayer Schering Pharma AG, Nonclinical Drug Safety, Berlin, Germany.
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Tardiff RG, Carson ML. Derivation of a reference dose and drinking water equivalent level for 1,2,3-trichloropropane. Food Chem Toxicol 2010; 48:1488-510. [PMID: 20303376 DOI: 10.1016/j.fct.2010.03.016] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2009] [Revised: 03/01/2010] [Accepted: 03/15/2010] [Indexed: 11/16/2022]
Abstract
In some US potable water supplies, 1,2,3-trichloropropane (TCP) has been present at ranges of non-detect to less than 100 ppb, resulting from past uses. In subchronic oral studies, TCP produced toxicity in kidneys, liver, and other tissues. TCP administered by corn oil gavage in chronic studies produced tumors at multiple sites in rats and mice; however, interpretation of these studies was impeded by substantial premature mortality. Drinking water equivalent levels (DWELs) were estimated for a lifetime of consumption by applying biologically-based safety/risk assessment approaches, including Monte Carlo techniques, and with consideration of kinetics and modes of action, to possibly replace default assumptions. Internationally recognized Frameworks for human relevance of animal data were employed to interpret the findings. Calculated were a reference dose (=39 microg/kg d) for non-cancer and Cancer Values (CV) (=10-14 microg/kg d) based on non-linear dose-response relationships for mutagenicity as a precursor of cancer. Lifetime Average Daily Intakes (LADI) are 3130 and 790-1120 microg/person-d for non-cancer and cancer, respectively. DWELs, estimated by applying a relative source contribution (RSC) of 50% to the LADIs, are 780 and 200-280 microg/L for non-cancer and cancer, respectively. These DWELs may inform establishment of formal/informal guidelines and standards to protect public health.
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Michael Bolger P, Leblanc JC, Woodrow Setzer R. Application of the Margin of Exposure (MoE) approach to substances in food that are genotoxic and carcinogenic. Food Chem Toxicol 2010; 48 Suppl 1:S25-33. [DOI: 10.1016/j.fct.2009.11.040] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2009] [Revised: 11/13/2009] [Accepted: 11/18/2009] [Indexed: 10/19/2022]
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Hansen SH, Olsen AK, Søderlund EJ, Brunborg G. In vitro investigations of glycidamide-induced DNA lesions in mouse male germ cells and in mouse and human lymphocytes. Mutat Res 2009; 696:55-61. [PMID: 20026424 DOI: 10.1016/j.mrgentox.2009.12.012] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2009] [Revised: 12/06/2009] [Accepted: 12/06/2009] [Indexed: 10/20/2022]
Abstract
The industrial compound and food contaminant acrylamide (AA) is a probable human carcinogen, also known to induce male-mediated reproductive effects in animals. Most data suggest that its metabolite glycidamide (GA) is involved in the observed toxicity. We have investigated in vitro effects of AA/GA in mouse male germ cells (prior to spermatid elongation) and human and mouse peripheral blood lymphocytes, to assess inter-species and cell-type differences in susceptibility, and to explore the nature of the DNA lesion(s) as well as their potential repair. The comet assay was used in combination with the DNA-repair enzymes Fpg and hOGG1 to measure specific DNA lesions. In contrast to AA, GA induced significant levels of DNA lesions (strand breaks and alkali-labile sites) at millimolar concentrations in mouse testicular cells and human peripheral blood lymphocytes (hPBL). Using Fpg, the GA-induced DNA damage was measured at 20-50-fold higher sensitivity, in all cell types investigated. GA-induced DNA damage could not be recognised by hOGG1, suggesting that, based on the known affinities of these repair enzymes, alkylation of guanine is involved, rather than oxidation. Human lymphocytes appeared to be more susceptible to GA-induced lesions than both types of mouse cells. Mouse testicular cells and lymphocytes seemed to respond similarly to GA-induced Fpg-sensitive DNA lesions. The persistence of lesions was explored with cells from mice either proficient or deficient in Ogg1 (mouse 8-oxoguanine DNA glycosylase). Low in vitro repair of GA-induced Fpg-sensitive lesions was observed in primary male germ cells and lymphocytes from both Ogg1(+/+) and Ogg1(-/-) mice. We conclude that there may be differences between mice and humans in AA/GA-induced genotoxicity, and DNA from mouse male germ cells does not appear to be more sensitive to GA than DNA from peripheral blood lymphocytes in vitro. The usefulness of the comet assay in combination with DNA-repair enzymes is demonstrated.
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Affiliation(s)
- Siri Helland Hansen
- Norwegian Institute of Public Health, Division of Environmental Medicine, Department of Chemical Toxicology, 0403 Oslo, Norway
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