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Yang Z, Wang W, Lin L, Xiao K, Peng L, Gao X, Zhou L. The association between urinary organophosphate insecticide metabolites and erectile dysfunction in the United States. Int J Impot Res 2024; 36:226-231. [PMID: 36513813 DOI: 10.1038/s41443-022-00655-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2022] [Revised: 11/27/2022] [Accepted: 11/30/2022] [Indexed: 12/14/2022]
Abstract
Organophosphate (OP) insecticides are the main chemicals used in agriculture for pest elimination, and they have been linked with many diseases. However, there is no literature regarding the impacts of organophosphate insecticide metabolite exposure on erectile dysfunction (ED). We aimed to evaluate the correlation between 4 urinary organophosphate insecticide metabolites and the presence of ED in a representative sample of men aged 20 and older. The dataset including a total of 555 subjects was obtained from the National Health and Nutrition Examination Survey (NHANES) 2003-2004. ED was assessed by a question from a self-report questionnaire. Weighted proportions and multivariable logistic regression analysis were utilized to examine the relationship between organophosphate insecticide metabolite exposure and ED. In multivariable logistic regression analysis, diethylphosphate (DEP) was positively correlated with ED (OR 1.07; 95% CI 1.01-1.14; P = 0.033) after full adjustment. Men in DEP tertile 4 had a significant 33% higher risk of ED than those in tertile 1. Furthermore, in a subgroup analysis, our results showed that higher DEP levels were significantly associated with ED in the young age group (20 ≤ age ≤ 39). Our study revealed a significant association between organophosphate insecticide metabolite exposure and an increased risk of ED. Moreover, the correlations were more evident in the young age group. The evaluation of urinary organophosphate insecticide metabolite exposure should be included in the risk assessment of ED. Further study to investigate the underlying mechanism, such as how long the urinary metabolite is present, whether ED is reversible in this population by lowering DEP concentrations, and how exposure to this metabolite affects erectile tissue, is warranted.
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Affiliation(s)
- Zerui Yang
- West China School of Medicine, Sichuan University, Chengdu, Sichuan, China
| | - Wei Wang
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Lede Lin
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Kaiwen Xiao
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Liao Peng
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Xiaoshuai Gao
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, Chengdu, Sichuan, China
| | - Liang Zhou
- Department of Urology, Institute of Urology, West China Hospital, Sichuan University, Chengdu, Sichuan, China.
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2
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Abduh MS, Alruhaimi RS, Alqhtani HA, Hussein OE, Abukhalil MH, Kamel EM, Mahmoud AM. Rosmarinic acid mitigates chlorpyrifos-induced oxidative stress, inflammation, and kidney injury in rats by modulating SIRT1 and Nrf2/HO-1 signaling. Life Sci 2023; 313:121281. [PMID: 36521549 DOI: 10.1016/j.lfs.2022.121281] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 11/30/2022] [Accepted: 12/08/2022] [Indexed: 12/14/2022]
Abstract
Chlorpyrifos (CPF) is a widely used broad-spectrum pesticide with multi-organ toxic effects. Oxidative stress was found to play a role in the deleterious effects of CPF, including nephrotoxicity. This study investigated the protective effect of the antioxidant polyphenol rosmarinic acid (RA) against CPF-induced kidney injury, with an emphasis on oxidative injury, inflammation, SIRT1, and Nrf2/HO-1 signaling. Rats received 10 mg/kg CPF and 25, 50, and 100 mg/kg RA orally for 28 days, and the samples were collected for analysis. CPF increased serum urea and creatinine and kidney Kim-1 and caused several histopathological alterations. ROS, MDA, NO, NF-κB p65, TNF-α, and IL-1β were elevated in the kidney of CPF-intoxicated rats. RA ameliorated kidney function markers, prevented tissue injury, suppressed ROS, MDA, and NO, and downregulated NF-κB p65, TNF-α, and IL-1β in CPF-intoxicated rats in a dose-dependent manner. RA decreased Bax, caspase-3, oxidative DNA damage, and Keap1, boosted antioxidant enzymes and Bcl-2, and upregulated Nrf2, HO-1, and SIRT1 in CPF-administered rats. Molecular docking simulation revealed the binding affinity of RA toward NF-κB, Keap1, HO-1, and SIRT1. In conclusion, RA prevented CPF nephrotoxicity by attenuating oxidative stress, inflammation, and apoptosis and upregulating SIRT1 and Nrf2/HO-1 signaling.
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Affiliation(s)
- Maisa Siddiq Abduh
- Immune Responses in Different Diseases Research Group, Department of Medical Laboratory Sciences, Faculty of Applied Medical Sciences, King Abdulaziz University, Jeddah, Saudi Arabia; Center of Excellence in Genomic Medicine Research, King Abdulaziz University, Jeddah, Saudi Arabia
| | - Reem S Alruhaimi
- Department of Biology, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
| | - Haifa A Alqhtani
- Department of Biology, College of Science, Princess Nourah bint Abdulrahman University, Riyadh, Saudi Arabia
| | - Omnia E Hussein
- Higher Technological Institute of Applied Health Sciences, Beni-Suef, Egypt
| | - Mohammad H Abukhalil
- Department of Medical Analysis, Princess Aisha Bint Al-Hussein College of Nursing and Health Sciences, Al-Hussein Bin Talal University, Ma'an, Jordan; Department of Biology, College of Science, Al-Hussein Bin Talal University, Ma'an, Jordan
| | - Emadeldin M Kamel
- Department of Chemistry, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt
| | - Ayman M Mahmoud
- Department of Life Sciences, Faculty of Science and Engineering, Manchester Metropolitan University, Manchester, UK; Physiology Division, Zoology Department, Faculty of Science, Beni-Suef University, Beni-Suef, Egypt.
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3
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Xu MY, Wang P, Sun YJ, Wu YJ. Disruption of Kidney Metabolism in Rats after Subchronic Combined Exposure to Low-Dose Cadmium and Chlorpyrifos. Chem Res Toxicol 2018; 32:122-129. [DOI: 10.1021/acs.chemrestox.8b00219] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Ming-Yuan Xu
- Laboratory of Molecular Toxicology, State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, P. R. China
| | - Pan Wang
- Laboratory of Molecular Toxicology, State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, P. R. China
| | - Ying-Jian Sun
- Laboratory of Molecular Toxicology, State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, P. R. China
- Department of Veterinary Medicine and Animal Science, Beijing University of Agriculture, Beijing 102206, P. R. China
| | - Yi-Jun Wu
- Laboratory of Molecular Toxicology, State Key Laboratory of Integrated Management of Pest Insects and Rodents, Institute of Zoology, Chinese Academy of Sciences, Beijing 100101, P. R. China
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4
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Poet TS, Timchalk C, Bartels MJ, Smith JN, McDougal R, Juberg DR, Price PS. Use of a probabilistic PBPK/PD model to calculate Data Derived Extrapolation Factors for chlorpyrifos. Regul Toxicol Pharmacol 2017; 86:59-73. [PMID: 28238854 DOI: 10.1016/j.yrtph.2017.02.014] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2016] [Revised: 01/24/2017] [Accepted: 02/17/2017] [Indexed: 11/16/2022]
Abstract
A physiologically based pharmacokinetic and pharmacodynamic (PBPK/PD) model combined with Monte Carlo analysis of inter-individual variation was used to assess the effects of the insecticide, chlorpyrifos and its active metabolite, chlorpyrifos oxon in humans. The PBPK/PD model has previously been validated and used to describe physiological changes in typical individuals as they grow from birth to adulthood. This model was updated to include physiological and metabolic changes that occur with pregnancy. The model was then used to assess the impact of inter-individual variability in physiology and biochemistry on predictions of internal dose metrics and quantitatively assess the impact of major sources of parameter uncertainty and biological diversity on the pharmacodynamics of red blood cell acetylcholinesterase inhibition. These metrics were determined in potentially sensitive populations of infants, adult women, pregnant women, and a combined population of adult men and women. The parameters primarily responsible for inter-individual variation in RBC acetylcholinesterase inhibition were related to metabolic clearance of CPF and CPF-oxon. Data Derived Extrapolation Factors that address intra-species physiology and biochemistry to replace uncertainty factors with quantitative differences in metrics were developed in these same populations. The DDEFs were less than 4 for all populations. These data and modeling approach will be useful in ongoing and future human health risk assessments for CPF and could be used for other chemicals with potential human exposure.
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Affiliation(s)
| | | | | | - Jordan N Smith
- Battelle, Pacific Northwest Division, Richland, WA, 99354, USA
| | - Robin McDougal
- Dug Safety and Metabolism, AstraZeneca, Gatehouse Park, Waltham, Boston, 02451, USA
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5
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Roh JY, Lee HJ, Kwon JH. Internal Concentration and Time Are Important Modifiers of Toxicity: The Case of Chlorpyrifos on Caenorhabditis elegans. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:9689-96. [PMID: 27490261 DOI: 10.1021/acs.est.6b02751] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
The internal concentration of chemicals in exposed organisms changes over time due to absorption, distribution, metabolism, and excretion processes since chemicals are taken up from the environment. Internal concentration and time are very important modifiers of toxicity when biomarkers are used to evaluate the potential hazards and risks of environmental pollutants. In this study, the responses of molecular biomarkers, and the fate of chemicals in the body, were comprehensively investigated to determine cause-and-effect relationships over time. Chlorpyrifos (CP) was selected as a model chemical, and Caenorhabditis elegans was exposed to CP for 4 h using the passive dosing method. Worms were then monitored in fresh medium during a 48-h recovery regime. The mRNA expression of genes related to CYP metabolism (cyp35a2 and cyp35a3) increased during the constant exposure phase. The body residue of CP decreased once it reached a peak level during the early stage of exposure, indicating that the initial uptake of CP rapidly induced biotransformation with the synthesis of new CYP metabolic proteins. The residual chlorpyrifos-oxon concentration, an acetylcholinesterase (AChE) inhibitor, continuously increased even after the recovery regime started. These delayed toxicokinetics seem to be important for the extension of AChE inhibition for up to 9 h after the start of the recovery regime. Comprehensive investigation into the molecular initiation events and changes in the internal concentrations of chemical species provide insight into response causality within the framework of an adverse outcome pathway.
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Affiliation(s)
- Ji-Yeon Roh
- Division of Environmental Science and Ecological Engineering, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Hyun-Jeoung Lee
- Division of Environmental Science and Ecological Engineering, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
| | - Jung-Hwan Kwon
- Division of Environmental Science and Ecological Engineering, Korea University , 145 Anam-ro, Seongbuk-gu, Seoul 02841, Republic of Korea
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6
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Timchalk C, Weber TJ, Smith JN. Computational strategy for quantifying human pesticide exposure based upon a saliva measurement. Front Pharmacol 2015; 6:115. [PMID: 26074822 PMCID: PMC4444746 DOI: 10.3389/fphar.2015.00115] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2015] [Accepted: 05/14/2015] [Indexed: 01/19/2023] Open
Abstract
Quantitative exposure data is important for evaluating toxicity risk and biomonitoring is a critical tool for evaluating human exposure. Direct personal monitoring provides the most accurate estimation of a subject's true dose, and non-invasive methods are advocated for quantifying exposure to xenobiotics. In this regard, there is a need to identify chemicals that are cleared in saliva at concentrations that can be quantified to support the implementation of this approach. This manuscript reviews the computational modeling approaches that are coupled to in vivo and in vitro experiments to predict salivary uptake and clearance of xenobiotics and provides additional insight on species-dependent differences in partitioning that are of key importance for extrapolation. The primary mechanism by which xenobiotics leave the blood and enter saliva involves paracellular transport, passive transcellular diffusion, or transcellular active transport with the majority of xenobiotics transferred by passive diffusion. The transcellular or paracellular diffusion of unbound chemicals in plasma to saliva has been computationally modeled using compartmental and physiologically based approaches. Of key importance for determining the plasma:saliva partitioning was the utilization of the Schmitt algorithm that calculates partitioning based upon the tissue composition, pH, chemical pKa, and plasma protein-binding. Sensitivity analysis identified that both protein-binding and pKa (for weak acids and bases) have significant impact on determining partitioning and species dependent differences based upon physiological variance. Future strategies are focused on an in vitro salivary acinar cell based system to experimentally determine and computationally predict salivary gland uptake and clearance for xenobiotics. It is envisioned that a combination of salivary biomonitoring and computational modeling will enable the non-invasive measurement of chemical exposures in human populations.
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Affiliation(s)
- Charles Timchalk
- Health Impacts and Exposure Science, Pacific Northwest National Laboratory Richland, WA, USA
| | - Thomas J Weber
- Health Impacts and Exposure Science, Pacific Northwest National Laboratory Richland, WA, USA
| | - Jordan N Smith
- Health Impacts and Exposure Science, Pacific Northwest National Laboratory Richland, WA, USA
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7
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A human life-stage physiologically based pharmacokinetic and pharmacodynamic model for chlorpyrifos: Development and validation. Regul Toxicol Pharmacol 2014; 69:580-97. [DOI: 10.1016/j.yrtph.2013.10.005] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Revised: 10/18/2013] [Accepted: 10/19/2013] [Indexed: 12/25/2022]
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8
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Poet TS, Timchalk C, Hotchkiss JA, Bartels MJ. Chlorpyrifos PBPK/PD model for multiple routes of exposure. Xenobiotica 2014; 44:868-81. [DOI: 10.3109/00498254.2014.918295] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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9
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Li R, He L, Zhou T, Ji X, Qian M, Zhou Y, Wang Q. Simultaneous determination of chlorpyrifos and 3,5,6-trichloro-2-pyridinol in duck muscle by modified QuEChERS coupled to gas chromatography tandem mass spectrometry (GC-MS/MS). Anal Bioanal Chem 2014; 406:2899-907. [DOI: 10.1007/s00216-014-7717-8] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2013] [Revised: 02/18/2014] [Accepted: 02/20/2014] [Indexed: 10/25/2022]
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10
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Zhang W, Tang Y, Du D, Smith J, Timchalk C, Liu D, Lin Y. Direct analysis of trichloropyridinol in human saliva using an Au nanoparticles-based immunochromatographic test strip for biomonitoring of exposure to chlorpyrifos. Talanta 2013; 114:261-7. [DOI: 10.1016/j.talanta.2013.06.012] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2013] [Revised: 05/31/2013] [Accepted: 06/10/2013] [Indexed: 11/25/2022]
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11
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Chen L, Zhao T, Pan C, Ross J, Ginevan M, Vega H, Krieger R. Absorption and excretion of organophosphorous insecticide biomarkers of malathion in the rat: Implications for overestimation bias and exposure misclassification from environmental biomonitoring. Regul Toxicol Pharmacol 2013; 65:287-93. [DOI: 10.1016/j.yrtph.2012.12.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/08/2012] [Revised: 12/27/2012] [Accepted: 12/29/2012] [Indexed: 11/24/2022]
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12
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Krieger R, Chen L, Ginevan M, Watkins D, Cochran R, Driver J, Ross J. Implications of estimates of residential organophosphate exposure from dialkylphosphates (DAPs) and their relevance to risk. Regul Toxicol Pharmacol 2012; 64:263-6. [DOI: 10.1016/j.yrtph.2012.08.012] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2012] [Revised: 07/21/2012] [Accepted: 08/16/2012] [Indexed: 10/28/2022]
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Acker CI, Nogueira CW. Chlorpyrifos acute exposure induces hyperglycemia and hyperlipidemia in rats. CHEMOSPHERE 2012; 89:602-608. [PMID: 22832337 DOI: 10.1016/j.chemosphere.2012.05.059] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/29/2011] [Revised: 01/24/2012] [Accepted: 05/16/2012] [Indexed: 06/01/2023]
Abstract
In this study we evaluated the hyperglycemic and hyperlipidemic effects of chlorpyrifos (CPF) after an acute exposure in rats. The mechanisms involved in hyperglycemia induced by CPF were studied. A single dose of CPF (50 mg kg(-1), subcutaneous, s.c.) was administered to overnight-fasted rats. Glucose and corticosterone levels, lipid status and paraoxonase (PON1) activity were determined in plasma of rats. Cardiovascular risk factors and the atherogenic index were calculated. Glycogen levels, tyrosine aminotransferase (TAT) and glucose-6-phosphatase (G6Pase) activities were determined in livers of rats. Cerebral acetylcholinesterase (AChE) activity was also determined. CPF caused an increase in glucose and glycogen levels as well as in TAT and G6Pase activities. The CPF exposure caused an increase in corticosterone levels, an inhibition of AChE activity and a reduction of PON1 activity. Regarding the lipid status, CPF induced an increase in triglycerides (TG) and low-density lipoprotein-cholesterol (LDL) levels and a decrease in high-density lipoprotein (HDL) levels associated with an increase of cardiovascular risk factors and the atherogenic index. The present study demonstrated that a single CPF administration caused hyperglycemia and hyperlipidemia in rats. The activation of the gluconeogenesis pathway, probably elicited by hypercorticosteronemia, is involved in the hyperglycemic effect of CPF in rats.
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Affiliation(s)
- Carmine Inês Acker
- Departamento de Química, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, CEP 97105-900, RS, Brazil
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14
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Smith JN, Wang J, Lin Y, Klohe EM, Timchalk C. Pharmacokinetics and Pharmacodynamics of Chlorpyrifos and 3,5,6-Trichloro-2-pyridinol in Rat Saliva After Chlorpyrifos Administration. Toxicol Sci 2012; 130:245-56. [DOI: 10.1093/toxsci/kfs251] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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TK Modeler version 1.0, a Microsoft® Excel®-based modeling software for the prediction of diurnal blood/plasma concentration for toxicokinetic use. Regul Toxicol Pharmacol 2012; 63:333-43. [DOI: 10.1016/j.yrtph.2012.04.002] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2011] [Revised: 03/15/2012] [Accepted: 04/04/2012] [Indexed: 11/21/2022]
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16
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Development of a source-to-outcome model for dietary exposures to insecticide residues: An example using chlorpyrifos. Regul Toxicol Pharmacol 2011; 61:82-92. [DOI: 10.1016/j.yrtph.2011.06.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/07/2011] [Revised: 06/11/2011] [Accepted: 06/13/2011] [Indexed: 11/21/2022]
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Ellison CA, Smith JN, Lein PJ, Olson JR. Pharmacokinetics and pharmacodynamics of chlorpyrifos in adult male Long-Evans rats following repeated subcutaneous exposure to chlorpyrifos. Toxicology 2011; 287:137-44. [PMID: 21708215 DOI: 10.1016/j.tox.2011.06.010] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2011] [Revised: 05/31/2011] [Accepted: 06/11/2011] [Indexed: 01/11/2023]
Abstract
Chlorpyrifos (CPF) is a commonly used organophosphorus pesticide. Several pharmacokinetic and pharmacodynamic studies have been conducted in rats in which CPF was administered as a single bolus dose. However, there is limited data regarding the pharmacokinetics and pharmacodynamics following daily exposure. Since occupational exposures often consist of repeated, daily exposures, there is a need to evaluate the pharmacokinetics and pharmacodynamics of CPF under exposure conditions which more accurately reflect real world human exposures. In this study, the pharmacokinetics and pharmacodynamics of CPF were assessed in male Long-Evans rats exposed daily to CPF (0, 3 or 10mg/kg/day, s.c. in peanut oil) over a 10 day study period. Throughout the study, multiple pharmacokinetic (urinary TCPy levels and tissue CPF and metabolite levels) and pharmacodynamic (blood and brain AChE activity) determinants were measured. Average blood AChE activity on day 10 was 54% and 33% of baseline among animals in the 3 and 10mg/kg/day CPF treatment groups, respectively, while average brain AChE activity was 67% and 28% of baseline. Comparable dose-response relationships between brain AChE inhibition and blood AChE inhibition, suggests that blood AChE activity is a valid biomarker of brain AChE activity. The pharmacokinetic and pharmacodynamic measures collected in this study were also used to optimize a rat physiologically based pharmacokinetic/pharmacodynamic (PBPK/PD) model for multiple s.c. exposures to CPF based on a previously published rat PBPK/PD model for CPF following a single bolus injection. This optimized model will be useful for determining pharmacokinetic and pharmacodynamic responses over a wide range of doses and durations of exposure, which will improve extrapolation of results between rats and humans.
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Affiliation(s)
- Corie A Ellison
- Department of Pharmacology and Toxicology, State University of New York at Buffalo, Buffalo, NY 14214, USA.
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18
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Forsberg ND, Rodriguez-Proteau R, Ma L, Morré J, Christensen JM, Maier CS, Jenkins JJ, Anderson KA. Organophosphorus pesticide degradation product in vitro metabolic stability and time-course uptake and elimination in rats following oral and intravenous dosing. Xenobiotica 2011; 41:422-9. [PMID: 21446834 DOI: 10.3109/00498254.2010.550656] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Abstract
Levels of urinary dialkylphosphates (DAPs) are currently used as a biomarker of human exposure to organophosphorus insecticides (OPs). It is known that OPs degrade on food commodities to DAPs at levels that approach or exceed those of the parent OP. However, little has been reported on the extent of DAP absorption, distribution, metabolism and excretion. The metabolic stability of O,O-dimethylphosphate (DMP) was assessed using pooled human and rat hepatic microsomes. Time-course samples were collected over 2 h and analyzed by LC-MS/MS. It was found that DMP was not metabolized by rat or pooled human hepatic microsomes. Male Sprague-Dawley rats were administered DMP at 20 mg kg(-1) via oral gavage and i.v. injection. Time-course plasma and urine samples were collected and analyzed by LC-MS/MS. DMP oral bioavailability was found to be 107 ± 39% and the amount of orally administered dose recovered in the urine was 30 ± 9.9% by 48 h. The in vitro metabolic stability, high bioavailability and extent of DMP urinary excretion following oral exposure in a rat model suggests that measurement of DMP as a biomarker of OP exposure may lead to overestimation of human exposure.
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Affiliation(s)
- N D Forsberg
- Department of Environmental and Molecular Toxicology, Oregon State University, Corvallis, OR 97331, USA
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19
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Wang L, Du D, Lu D, Lin CT, Smith JN, Timchalk C, Liu F, Wang J, Lin Y. Enzyme-linked immunosorbent assay for detection of organophosphorylated butyrylcholinesterase: a biomarker of exposure to organophosphate agents. Anal Chim Acta 2011; 693:1-6. [PMID: 21504805 DOI: 10.1016/j.aca.2011.03.013] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2011] [Revised: 03/04/2011] [Accepted: 03/06/2011] [Indexed: 01/13/2023]
Abstract
A sandwich enzyme-linked immunosorbent assay (sELISA) has been developed for detection of organophosphorylated butyrylcholinesterase (OP-BChE), a potential biomarker for human exposure to organophosphate insecticides and nerve agents. A pair of antibodies specific to OP-BChE adduct were identified through systematic screening of several anti BChE antibodies (anti-BChE) and anti-phosphoserine antibodies (anti-P(ser)) from different sources. The selected anti-BChE (set as capture antibody) antibodies recognize both phosphorylated and nonphosphorylated BChE. These antibodies can therefore be used to capture both BChE and OP-BChE from the sample matrices. The anti-P(ser) (set as detecting antibody) was used to recognize the OP moiety of OP-BChE adducts. With the combination of the selected antibody pair, several key parameters (such as the concentration of anti-BChE and anti-P(ser), and the blocking agent) were optimized to enhance the sensitivity and selectivity of the sELISA. Under the optimal conditions, the sELISA has shown a wide linear range from 0.03 nM to 30 nM, with a detection limit of 0.03 nM. Furthermore, the sELISA was successfully applied to detect OP-BChE using in vitro biological samples such as rat plasma spiked with OP-BChE with excellent adduct recovery (z>99%). These results demonstrate that this novel approach holds great promise to develop an ELISA kit and offers a simple and cost-effective tool for screening/evaluating exposure to organophosphate insecticides and nerve agents.
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Affiliation(s)
- Limin Wang
- Key Laboratory of Monitoring and Management of Crop Diseases and Pest Insects, Ministry of Agriculture, Department of Plant Pathology, College of Plant Protection, Nanjing Agricultural University, China
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