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Afshari S, Sarailoo M, Asghariazar V, Safarzadeh E, Dadkhah M. Persistent diazinon induced neurotoxicity: The effect on inhibitory avoidance memory performance, amyloid precursor proteins, and TNF-α levels in the prefrontal cortex of rats. Hum Exp Toxicol 2024; 43:9603271241235408. [PMID: 38472141 DOI: 10.1177/09603271241235408] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/14/2024]
Abstract
INTRODUCTION Organophosphate pesticides (Ops) like diazinon (DZN) have well-known neurotoxic effects and low-level chronic exposure has been linked to detrimental neurobehavioral impairments and memory deficits. However, it's not entirely clear how DZN-induced biological changes, particularly in the prefrontal cortex (PFC) contribute to these effects. The purpose of this study is to investigate the impact of DZN exposure on inhibitory avoidance (IA) memory function, amyloid precursor expression (APP), and proinflammatory tumor necrosis factor-α (TNF-α) levels in the rat cortex. MATERIALS AND METHODS Rats were divided into 4 groups and recived 2 mg/kg DZN for 5-days or 12-weeks and two control groups recived the same volume of vehicle. IA memory was assesed using the shuttle box apparatus. Rats were sacrificed and the prefrontal cortex PFC were removed. Real-time PCR and Western blotting were used to messure TNF-α, and amyloid protein precursors gene expression and protein levels. RESULTS Our findings indicated that DZN caused body weight loss and a notable decline in performance on the IA memory. Additionally, 5-days exposure increased APP and APLP2 protein levels in the PFC, while 12-weeks exposure decreased these levels. Furthermore, expression of APP and APLP2 gens were decreased in PFC. TNF-α levels increased as a result of 5-days exposure to DZN, but these levels dropped to normal after 12-weeks administration, and this observation was significant. CONCLUSION Taken together, exposure to low doses of DZN leads to disturbances in IA memory performance and also alternations in amyloid beta precursors that can be related to increased risk of Alzheimer's disease.
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Affiliation(s)
- Salva Afshari
- Students Research Committee, Pharmacy School, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Mehdi Sarailoo
- Students Research Committee, School of Public Health, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Vahid Asghariazar
- Cancer Immunology and Immunotherapy Research Center, Ardabil University of Medical Sciences, Ardabil, Iran
- Deputy of Research & Technology, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Elham Safarzadeh
- Cancer Immunology and Immunotherapy Research Center, Ardabil University of Medical Sciences, Ardabil, Iran
- Department of Microbiology, Parasitology, and Immunology, Ardabil University of Medical Sciences, Ardabil, Iran
| | - Masoomeh Dadkhah
- Pharmaceutical Sciences Research Center, Ardabil University of Medical Sciences, Ardabil, Iran
- School of Pharmacy, Ardabil University of Medical Sciences, Ardabil, Iran
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Stanaway IB, Wallace JC, Hong S, Wilder CS, Green FH, Tsai J, Knight M, Workman T, Vigoren EM, Smith MN, Griffith WC, Thompson B, Shojaie A, Faustman EM. Alteration of oral microbiome composition in children living with pesticide-exposed farm workers. Int J Hyg Environ Health 2023; 248:114090. [PMID: 36516690 PMCID: PMC9898171 DOI: 10.1016/j.ijheh.2022.114090] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2022] [Revised: 08/30/2022] [Accepted: 11/30/2022] [Indexed: 12/14/2022]
Abstract
Our prior work shows that azinphos-methyl pesticide exposure is associated with altered oral microbiomes in exposed farmworkers. Here we extend this analysis to show the same association pattern is also evident in their children. Oral buccal swab samples were analyzed at two time points, the apple thinning season in spring-summer 2005 for 78 children and 101 adults and the non-spray season in winter 2006 for 62 children and 82 adults. The pesticide exposure for the children were defined by the farmworker occupation of the cohabitating household adult and the blood azinphos-methyl detection of the cohabitating adult. Oral buccal swab 16S rRNA sequencing determined taxonomic microbiota proportional composition from concurrent samples from both adults and children. Analysis of the identified bacteria showed significant proportional changes for 12 of 23 common oral microbiome genera in association with azinphos-methyl detection and farmworker occupation. The most common significantly altered genera had reductions in the abundance of Streptococcus, suggesting an anti-microbial effect of the pesticide. Principal component analysis of the microbiome identified two primary clusters, with association of principal component 1 to azinphos-methyl blood detection and farmworker occupational status of the household. The children's buccal microbiota composition clustered with their household adult in ∼95% of the households. Household adult farmworker occupation and household pesticide exposure is associated with significant alterations in their children's oral microbiome composition. This suggests that parental occupational exposure and pesticide take-home exposure pathways elicit alteration of their children's microbiomes.
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Affiliation(s)
- Ian B Stanaway
- Department of Environmental and Occupational Health Sciences, Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, WA, USA
| | - James C Wallace
- Department of Environmental and Occupational Health Sciences, Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, WA, USA
| | - Sungwoo Hong
- Department of Environmental and Occupational Health Sciences, Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, WA, USA
| | - Carly S Wilder
- Department of Environmental and Occupational Health Sciences, Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, WA, USA
| | - Foad H Green
- Department of Environmental and Occupational Health Sciences, Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, WA, USA
| | - Jesse Tsai
- Department of Environmental and Occupational Health Sciences, Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, WA, USA
| | - Misty Knight
- Department of Environmental and Occupational Health Sciences, Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, WA, USA
| | - Tomomi Workman
- Department of Environmental and Occupational Health Sciences, Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, WA, USA
| | - Eric M Vigoren
- Department of Environmental and Occupational Health Sciences, Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, WA, USA
| | - Marissa N Smith
- Department of Environmental and Occupational Health Sciences, Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, WA, USA
| | - William C Griffith
- Department of Environmental and Occupational Health Sciences, Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, WA, USA
| | - Beti Thompson
- Fred Hutchinson Cancer Research Center, Seattle, WA, USA
| | - Ali Shojaie
- Department of Biostatistics, University of Washington, Seattle, WA, USA
| | - Elaine M Faustman
- Department of Environmental and Occupational Health Sciences, Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, WA, USA.
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Ribeiro AC, Hawkins E, Jahr FM, McClay JL, Deshpande LS. Repeated exposure to chlorpyrifos is associated with a dose-dependent chronic neurobehavioral deficit in adult rats. Neurotoxicology 2022; 90:172-183. [DOI: 10.1016/j.neuro.2022.03.011] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2021] [Revised: 02/16/2022] [Accepted: 03/25/2022] [Indexed: 11/16/2022]
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Perez-Fernandez C, Morales-Navas M, Guardia-Escote L, Garrido-Cárdenas JA, Colomina MT, Giménez E, Sánchez-Santed F. Long-term effects of low doses of Chlorpyrifos exposure at the preweaning developmental stage: A locomotor, pharmacological, brain gene expression and gut microbiome analysis. Food Chem Toxicol 2020; 135:110865. [DOI: 10.1016/j.fct.2019.110865] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2019] [Revised: 09/05/2019] [Accepted: 09/30/2019] [Indexed: 12/26/2022]
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5
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Hallal N, El Khayat El Sabbouri H, Salami A, Ramadan W, Khachfe H, Moustafa ME, Khalil M, Joumaa WH. Impacts of prolonged chlorpyrifos exposure on locomotion and slow-and fast- twitch skeletal muscles contractility in rats. Toxicol Rep 2019; 6:598-606. [PMID: 31297333 PMCID: PMC6597941 DOI: 10.1016/j.toxrep.2019.06.006] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2019] [Revised: 06/08/2019] [Accepted: 06/11/2019] [Indexed: 12/11/2022] Open
Abstract
AIM Investigate the effect of dietary exposure to chlorpyrifos on locomotion and contraction of soleus andextensor digitorum longus (edl) involved in locomotion. Methods: Rats were fed diets containing 1 or 5 mg kg-1 of chlorpyrifos for six weeks. Locomotion has been assessed weekly using beam walking and beam balance tests. Soleus and edl were removed to study contractile properties, myofibrillar protein content and myosin heavy chain isoforms. RESULTS Animals treated with 5 mg kg-1 chlorpyrifos had a decrease body weight. An increase by 28% and 24% in latency time assessed by beam walking test and a decrease by 9% and 13% in the beam balance time was reported after 6 weeks of 1 and 5 chlorpyrifos exposure respectively. The contractile properties in soleus showed an increase in twitch amplitude by 25% and 63% in 1 and 5 doses respectively, without modification in the contraction time and half relaxation time. edl treated with 1 mg kg-1 showed a decrease by 35%, 42% and 22% in twitch amplitude, contraction time and half relaxation time respectively. edl treated with 5 mg kg-1 showed an increase of 23% in twitch amplitude without modification of the other parameters. These changes were associated with modification of myofibrillar protein content in all treated groups. Myosin heavy chain isoforms were altered in both skeletal muscles treated with 1 mg kg-1. CONCLUSION Exposure to chlorpyrifos can alter the locomotion and produce physiological changes in a dose and muscle type related manner.
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Affiliation(s)
- Nancy Hallal
- Department of Biological Sciences, Faculty of Science, Beirut Arab University, Lebanon
| | - Hiba El Khayat El Sabbouri
- Laboratoire Rammal Hassan Rammal, Equipe de recherche PhyToxE, Faculté des Sciences (section V), Université libanaise, Nabatieh, Lebanon
- PERITOX UMR-I-0, University of Picardie Jules Verne, 80025, Amiens, France
| | - Ali Salami
- Laboratoire Rammal Hassan Rammal, Equipe de recherche PhyToxE, Faculté des Sciences (section V), Université libanaise, Nabatieh, Lebanon
| | - Wiam Ramadan
- Laboratoire Rammal Hassan Rammal, Equipe de recherche PhyToxE, Faculté des Sciences (section V), Université libanaise, Nabatieh, Lebanon
- Lebanese Institute for Biomedical Research and Application (LIBRA), International University of Beirut (BIU), Beirut, Lebanon
| | - Hassan Khachfe
- Lebanese Institute for Biomedical Research and Application (LIBRA), International University of Beirut (BIU), Beirut, Lebanon
| | - Mohamed E. Moustafa
- Department of Biological Sciences, Faculty of Science, Beirut Arab University, Lebanon
- Department of Biochemistry, Faculty of Sciences, Alexandria University, Egypt
| | - Mahmoud Khalil
- Department of Biological Sciences, Faculty of Science, Beirut Arab University, Lebanon
| | - Wissam H. Joumaa
- Laboratoire Rammal Hassan Rammal, Equipe de recherche PhyToxE, Faculté des Sciences (section V), Université libanaise, Nabatieh, Lebanon
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Mohammadzadeh L, Abnous K, Razavi BM, Hosseinzadeh H. Crocin-protected malathion-induced spatial memory deficits by inhibiting TAU protein hyperphosphorylation and antiapoptotic effects. Nutr Neurosci 2019; 23:221-236. [DOI: 10.1080/1028415x.2018.1492772] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Leila Mohammadzadeh
- Department of Pharmacodynamics and Toxicology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Khalil Abnous
- Pharmaceutical Research Center, Department of Medicinal Chemistry, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Bibi Marjan Razavi
- Targeted Drug Delivery Research Center, Department of Pharmacodynamics and Toxicology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Hossein Hosseinzadeh
- Department of Pharmacodynamics and Toxicology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
- Pharmaceutical Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
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Kaur S, Singla N, Dhawan DK. Neuro-protective potential of quercetin during chlorpyrifos induced neurotoxicity in rats. Drug Chem Toxicol 2019; 42:220-230. [DOI: 10.1080/01480545.2019.1569022] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Simranjeet Kaur
- Department of Biophysics, Panjab University, Chandigarh, India
| | - Neha Singla
- Department of Biophysics, Panjab University, Chandigarh, India
| | - D. K. Dhawan
- Department of Biophysics, Panjab University, Chandigarh, India
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Learning, memory and the expression of cholinergic components in mice are modulated by the pesticide chlorpyrifos depending upon age at exposure and apolipoprotein E (APOE) genotype. Arch Toxicol 2019; 93:693-707. [DOI: 10.1007/s00204-019-02387-9] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/17/2018] [Accepted: 01/10/2019] [Indexed: 12/20/2022]
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Hussein RM, Mohamed WR, Omar HA. A neuroprotective role of kaempferol against chlorpyrifos-induced oxidative stress and memory deficits in rats via GSK3β-Nrf2 signaling pathway. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2018; 152:29-37. [PMID: 30497708 DOI: 10.1016/j.pestbp.2018.08.008] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Revised: 06/25/2018] [Accepted: 08/10/2018] [Indexed: 06/09/2023]
Abstract
Chlorpyrifos (CPF) is an agricultural pesticide and a potential food contaminant, which causes neurotoxicity. Here, we aimed at exploring the link between the repeated exposure to CPF and memory dysfunction in rats and the possible protective effect of kaempferol, a flavonoid with appreciable antioxidant and anti-inflammatory activities. Rats were divided into: Control group (received drug vehicles for 14 days); CPF-treated group (received subcutaneous 18 mg/kg BW of CPF daily for 14 days and CPF + Kaempferol treated group (received the same CPF dose +21 mg/kg BW of Kaempferol intraperitoneally for 14 days. On the 14th day, Y-maze and novel target recognition behavioral tests were employed to evaluate memory deficits. 24 h after the last dose of CPF, animals were sacrificed, and brain tissues were used for the determination of oxidative stress biomarkers and gene expression levels of GSK3β and Nrf2. The results revealed that CPF-treated rats suffered from severe deterioration of spatial and non-spatial memory functions with low activities of antioxidant enzymes and acetylcholinesterase (AChE). The administration of kaempferol significantly protected against CPF-induced neuronal damage, increased the activities of antioxidant enzymes and AChE and induced a better performance in the behavioral tests. The protective effect of kaempferol was mediated through the inhibition of GSK3β gene expression and the induction of Nrf2 expression in the brain tissues. In conclusion, the repeated exposure to CPF is associated with oxidative stress and memory deficits in rats. However, kaempferol administration effectively alleviated CPF- induced brain toxicity, possibly through the modulation of GSK3β-Nrf2 signaling pathway.
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Affiliation(s)
- Rasha M Hussein
- Department of Biochemistry, Faculty of Pharmacy, Beni-Suef University, 62514 Beni-Suef, Egypt.
| | - Wafaa R Mohamed
- Department of Pharmacology and Toxicology, Faculty of Pharmacy, Beni-Suef University, Beni-Suef 62514, Egypt
| | - Hany A Omar
- Sharjah Institute for Medical Research and College of Pharmacy, University of Sharjah, Sharjah 27272, United Arab Emirates; Department of Pharmacology and Toxicology, Faculty of Pharmacy, Beni-Suef University, Beni-Suef 62514, Egypt
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10
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Bertucci F, Jacob H, Mignucci A, Gache C, Roux N, Besson M, Berthe C, Metian M, Lecchini D. Decreased retention of olfactory predator recognition in juvenile surgeon fish exposed to pesticide. CHEMOSPHERE 2018; 208:469-475. [PMID: 29886335 DOI: 10.1016/j.chemosphere.2018.06.017] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/09/2018] [Revised: 06/01/2018] [Accepted: 06/03/2018] [Indexed: 06/08/2023]
Abstract
Dory, the animated surgeonfish created by the Pixar Animation studios, famously suffered from short-term memory loss leading to many adventures. In reality, many fishes have excellent cognitive abilities and are able to learn and retain important information such as the identity of predators. However, if and how cognition can be affected by anthropogenically altered oceanic conditions is poorly understood. Here, we examine the effect of a widely used pesticide, chlorpyrifos, on the retention of acquired predator recognition in post-larval stage of the surgeonfish Acanthurus triostegus. Through associative learning, post-larvae of A. triostegus were first observed to forage significantly less in the presence of conspecific alarm cues and alarm cues associated to a predator's odor. The retention of this anti-predator behavior was estimated to last between 2 and 5 days in the absence of pesticide. However, environmentally-relevant concentrations of chlorpyrifos (1 μg.L-1) induced the loss of this acquired predator recognition. This reduced ability to recognize learned predators is discussed as it may lead to more vulnerable fish communities in coastal areas subjected to organophosphate pesticide pollution.
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Affiliation(s)
- Frédéric Bertucci
- PSL University Paris, EPHE-UPVD-CNRS, USR3278 CRIOBE, 98729 Papetoai, Moorea, French Polynesia; Laboratoire de Morphologie Fonctionnelle et Evolutive, Université de Liège, Campus Sart Tilman, Bât. B6c, Allée de la Chimie 3, 4000 Liège, Belgium.
| | - Hugo Jacob
- PSL University Paris, EPHE-UPVD-CNRS, USR3278 CRIOBE, 98729 Papetoai, Moorea, French Polynesia; International Atomic Energy Agency, Environment Laboratories, 4a, Quai Antoine 1er, Principality of Monaco, Monaco
| | - Alexandre Mignucci
- PSL University Paris, EPHE-UPVD-CNRS, USR3278 CRIOBE, 98729 Papetoai, Moorea, French Polynesia
| | - Camille Gache
- PSL University Paris, EPHE-UPVD-CNRS, USR3278 CRIOBE, 98729 Papetoai, Moorea, French Polynesia
| | - Natacha Roux
- PSL University Paris, EPHE-UPVD-CNRS, USR3278 CRIOBE, 98729 Papetoai, Moorea, French Polynesia; Observatoire Océanologique de Banyuls-sur-Mer, UMR7232, Université Pierre et Marie Curie Paris, 1 avenue du Fontaulé, 66650 Banyuls-sur-Mer, France
| | - Marc Besson
- PSL University Paris, EPHE-UPVD-CNRS, USR3278 CRIOBE, 98729 Papetoai, Moorea, French Polynesia; Observatoire Océanologique de Banyuls-sur-Mer, UMR7232, Université Pierre et Marie Curie Paris, 1 avenue du Fontaulé, 66650 Banyuls-sur-Mer, France
| | - Cécile Berthe
- PSL University Paris, EPHE-UPVD-CNRS, USR3278 CRIOBE, 98729 Papetoai, Moorea, French Polynesia
| | - Marc Metian
- International Atomic Energy Agency, Environment Laboratories, 4a, Quai Antoine 1er, Principality of Monaco, Monaco
| | - David Lecchini
- PSL University Paris, EPHE-UPVD-CNRS, USR3278 CRIOBE, 98729 Papetoai, Moorea, French Polynesia; Laboratoire d'Excellence "CORAIL", Moorea, French Polynesia
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Zurlinden TJ, Reisfeld B. A Novel Method for the Development of Environmental Public Health Indicators and Benchmark Dose Estimation Using a Health-Based End Point for Chlorpyrifos. ENVIRONMENTAL HEALTH PERSPECTIVES 2018; 126:047009. [PMID: 29681141 PMCID: PMC6071752 DOI: 10.1289/ehp1743] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/08/2017] [Revised: 02/04/2018] [Accepted: 03/12/2018] [Indexed: 05/06/2023]
Abstract
BACKGROUND Organophosphorus (OP) compounds are the most widely used group of insecticides in the world. Risk assessments for these chemicals have focused primarily on 10% inhibition of acetylcholinesterase in the brain as the critical metric of effect. Aside from cholinergic effects resulting from acute exposure, many studies suggest a linkage between cognitive deficits and long-term OP exposure. OBJECTIVE In this proof-of-concept study, we focused on one of the most widely used OP insecticides in the world, chlorpyrifos (CPF), and utilized an existing physiologically based pharmacokinetic (PBPK) model and a novel pharmacodynamic (PD) dose-response model to develop a point of departure benchmark dose estimate for cognitive deficits following long-term, low-dose exposure to this chemical in rodents. METHODS Utilizing a validated PBPK/PD model for CPF, we generated a database of predicted biomarkers of exposure and internal dose metrics in both rat and human. Using simulated peak brain CPF concentrations, we developed a dose-response model to predict CPF-induced spatial memory deficits and correlated these changes to relevant biomarkers of exposure to derive a benchmark dose specific to neurobehavioral changes. We extended these cognitive deficit predictions to humans and simulated corresponding exposures using a model parameterized for humans. RESULTS Results from this study indicate that the human-equivalent benchmark dose (BMD) based on a 15% cognitive deficit as an end point is lower than that using the present threshold for 10% brain AChE inhibition. This predicted human-equivalent subchronic BMD threshold compares to occupational exposure levels determined from biomarkers of exposure and corresponds to similar exposure conditions where deficits in cognition are observed. CONCLUSIONS Quantitative PD models based on neurobehavioral testing in animals offer an important addition to the methodologies used for establishing useful environmental public health indicators and BMDs, and predictions from such models could help inform the human health risk assessment for chlorpyrifos. https://doi.org/10.1289/EHP1743.
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Affiliation(s)
- Todd J Zurlinden
- Department of Chemical and Biological Engineering, Colorado State University, Fort Collins, CO, USA
| | - Brad Reisfeld
- Department of Chemical and Biological Engineering, Colorado State University, Fort Collins, CO, USA
- School of Biomedical Engineering, Colorado State University, Fort Collins, CO, USA
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12
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Two cholinesterase inhibitors trigger dissimilar effects on behavior and body weight in C57BL/6 mice: The case of chlorpyrifos and rivastigmine. Behav Brain Res 2017; 318:1-11. [DOI: 10.1016/j.bbr.2016.10.014] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2016] [Revised: 10/05/2016] [Accepted: 10/07/2016] [Indexed: 01/03/2023]
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13
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Stanaway IB, Wallace JC, Shojaie A, Griffith WC, Hong S, Wilder CS, Green FH, Tsai J, Knight M, Workman T, Vigoren EM, McLean JS, Thompson B, Faustman EM. Human Oral Buccal Microbiomes Are Associated with Farmworker Status and Azinphos-Methyl Agricultural Pesticide Exposure. Appl Environ Microbiol 2017; 83:e02149-16. [PMID: 27836847 PMCID: PMC5203616 DOI: 10.1128/aem.02149-16] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2016] [Accepted: 10/24/2016] [Indexed: 12/24/2022] Open
Abstract
In a longitudinal agricultural community cohort sampling of 65 adult farmworkers and 52 adult nonfarmworkers, we investigated agricultural pesticide exposure-associated changes in the oral buccal microbiota. We found a seasonally persistent association between the detected blood concentration of the insecticide azinphos-methyl and the taxonomic composition of the buccal swab oral microbiome. Blood and buccal samples were collected concurrently from individual subjects in two seasons, spring/summer 2005 and winter 2006. Mass spectrometry quantified blood concentrations of the organophosphate insecticide azinphos-methyl. Buccal oral microbiome samples were 16S rRNA gene DNA sequenced, assigned to the bacterial taxonomy, and analyzed after "centered-log-ratio" transformation to handle the compositional nature of the proportional abundances of bacteria per sample. Nonparametric analysis of the transformed microbiome data for individuals with and without azinphos-methyl blood detection showed significant perturbations in seven common bacterial taxa (>0.5% of sample mean read depth), including significant reductions in members of the common oral bacterial genus Streptococcus Diversity in centered-log-ratio composition between individuals' microbiomes was also investigated using principal-component analysis (PCA) to reveal two primary PCA clusters of microbiome types. The spring/summer "exposed" microbiome cluster with significantly less bacterial diversity was enriched for farmworkers and contained 27 of the 30 individuals who also had azinphos-methyl agricultural pesticide exposure detected in the blood. IMPORTANCE In this study, we show in human subjects that organophosphate pesticide exposure is associated with large-scale significant alterations of the oral buccal microbiota composition, with extinctions of whole taxa suggested in some individuals. The persistence of this association from the spring/summer to the winter also suggests that long-lasting effects on the commensal microbiota have occurred. The important health-related outcomes of these agricultural community individuals' pesticide-associated microbiome perturbations are not understood at this time. Future investigations should index medical and dental records for common and chronic diseases that may be interactively caused by this association between pesticide exposure and microbiome alteration.
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Affiliation(s)
- Ian B Stanaway
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
- Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, Washington, USA
| | - James C Wallace
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
- Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, Washington, USA
| | - Ali Shojaie
- Department of Biostatistics, University of Washington, Seattle, Washington, USA
| | - William C Griffith
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
- Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, Washington, USA
| | - Sungwoo Hong
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
- Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, Washington, USA
| | - Carly S Wilder
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
- Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, Washington, USA
| | - Foad H Green
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
- Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, Washington, USA
| | - Jesse Tsai
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
- Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, Washington, USA
| | - Misty Knight
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
- Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, Washington, USA
| | - Tomomi Workman
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
- Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, Washington, USA
| | - Eric M Vigoren
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
- Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, Washington, USA
| | - Jeffrey S McLean
- School of Dentistry, Periodontics, University of Washington, Seattle, Washington, USA
| | - Beti Thompson
- Fred Hutchinson Cancer Research Center, Seattle, Washington, USA
| | - Elaine M Faustman
- Department of Environmental and Occupational Health Sciences, University of Washington, Seattle, Washington, USA
- Institute for Risk Analysis and Risk Communication, University of Washington, Seattle, Washington, USA
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Adedara IA, Rosemberg DB, de Souza D, Farombi EO, Aschner M, Souza DO, Rocha JBT. Neurobehavioral and biochemical changes in Nauphoeta cinerea following dietary exposure to chlorpyrifos. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2016; 130:22-30. [PMID: 27155480 DOI: 10.1016/j.pestbp.2015.12.004] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/27/2015] [Revised: 12/09/2015] [Accepted: 12/09/2015] [Indexed: 06/05/2023]
Abstract
The present study aimed to increase our understanding about the mode of toxic action of organophosphate pesticides in insects by evaluating the biochemical and neurobehavioral characteristics in Nauphoeta cinerea exposed to chlorpyrifos (CPF)-contaminated diet. The insects were exposed for 35 consecutive days to CPF at 0.078, 0.15625, 0.3125 and 0.625μg/g feed. Locomotor behavior was assessed for a 10-min trial in a novel arena and subsequently, biochemical analyses were carried out using the cockroaches' heads. In comparison to control, CPF-exposed cockroaches showed significant decreases in the total distance traveled, body rotation, turn angle and meandering, along with significant increase in the number of falls, time and episodes of immobility. The marked decrease in the exploratory profiles of CPF-exposed cockroaches was confirmed by track plots, whereas occupancy plot analyses showed a progressive dispersion at 0.15625μg/g feed group. Moreover, the heads of CPF-exposed cockroaches showed marked decrease in acetylcholinesterase activity and antioxidant status with concomitant significant elevation in dichlorofluorescein oxidation and lipid peroxidation levels in CPF-treated cockroaches. Gas Chromatography-Mass Spectrometry analyses revealed bioaccumulation of CPF in cockroaches exposed to concentrations above 0.078μg/g feed. The findings from this investigation showed N. cinerea as a value model organism for the risk assessment of environmental organophosphate contamination in insects.
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Affiliation(s)
- Isaac A Adedara
- Departamento de Bioquímica e Biologia Molecular, CCNE, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil; Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos 2600-Anexo, 90035-003 Porto Alegre, RS, Brazil; Drug Metabolism and Toxicology Research Laboratories, Department of Biochemistry, College of Medicine, University of Ibadan, Ibadan, Nigeria
| | - Denis B Rosemberg
- Departamento de Bioquímica e Biologia Molecular, CCNE, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
| | - Diego de Souza
- Departamento de Bioquímica e Biologia Molecular, CCNE, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil
| | - Ebenezer O Farombi
- Drug Metabolism and Toxicology Research Laboratories, Department of Biochemistry, College of Medicine, University of Ibadan, Ibadan, Nigeria
| | - Michael Aschner
- Department of Molecular Pharmacology; Albert Einstein College of Medicine Forchheimer 209; 1300 Morris Park Avenue, Bronx, NY 10461, USA
| | - Diogo O Souza
- Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos 2600-Anexo, 90035-003 Porto Alegre, RS, Brazil
| | - Joao B T Rocha
- Departamento de Bioquímica e Biologia Molecular, CCNE, Universidade Federal de Santa Maria, 97105-900 Santa Maria, RS, Brazil.
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15
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Dheyongera G, Grzebyk K, Rudolf AM, Sadowska ET, Koteja P. The effect of chlorpyrifos on thermogenic capacity of bank voles selected for increased aerobic exercise metabolism. CHEMOSPHERE 2016; 149:383-390. [PMID: 26878110 DOI: 10.1016/j.chemosphere.2015.12.120] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2015] [Revised: 12/24/2015] [Accepted: 12/28/2015] [Indexed: 06/05/2023]
Abstract
Agro-chemicals potentially cause adverse effects in non-target organisms. The rate of animal energy metabolism can influence their susceptibility to pesticides by influencing food consumption, biotransformation and elimination rates of toxicants. We used experimental evolution to study the effects of inherent differences in energy metabolism rate and exposure to the organophosphate insecticide, chlorpyrifos (CPF) on thermogenic capacity in a wild rodent, the bank vole (Myodes = Clethrionomys glareolus). The voles were sampled from four replicate lines selected for high swim-induced aerobic metabolism (A) and four unselected control (C) lines. Thermogenic capacity, measured as the maximum cold-induced rate of oxygen consumption (VO2cold), was higher in the A - than C lines, and it decreased after continuous exposure to CPF via food or after a single dose administered via oral gavage, but only when measured shortly after exposure. VO2cold measured 24 h after repeated exposure was not affected. In addition, gavage with a single dose led to decreased food consumption and loss in body mass. Importantly, the adverse effects of CPF did not differ between the selected and control lines. Therefore, exposure to CPF has adverse effects on thermoregulatory performance and energy balance in this species. The effects are short-lived and their magnitude is not associated with the inherent level of energy metabolism. Even without severe symptoms of poisoning, fitness can be compromised under harsh environmental conditions, such as cold and wet weather.
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Affiliation(s)
- Geoffrey Dheyongera
- Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30-387, Krakow, Poland.
| | - Katherine Grzebyk
- Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30-387, Krakow, Poland
| | - Agata M Rudolf
- Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30-387, Krakow, Poland
| | - Edyta T Sadowska
- Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30-387, Krakow, Poland
| | - Paweł Koteja
- Institute of Environmental Sciences, Jagiellonian University, Gronostajowa 7, 30-387, Krakow, Poland
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16
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Smith C, Lee R, Moran A, Sipos M. Repeated low-dose exposures to sarin, soman, or VX affect acoustic startle in guinea pigs. Neurotoxicol Teratol 2016; 54:36-45. [DOI: 10.1016/j.ntt.2016.01.005] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2015] [Revised: 12/21/2015] [Accepted: 01/28/2016] [Indexed: 10/22/2022]
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17
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Kara M, Yumrutas O, Demir CF, Ozdemir HH, Bozgeyik I, Coskun S, Eraslan E, Bal R. Insecticide imidacloprid influences cognitive functions and alters learning performance and related gene expression in a rat model. Int J Exp Pathol 2015; 96:332-7. [PMID: 26568164 DOI: 10.1111/iep.12139] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2015] [Accepted: 07/18/2015] [Indexed: 01/11/2023] Open
Abstract
The potential toxic effects of several pesticides, including imidacloprid on non-target organisms have not been clearly established. Also, the chronic effects of non-toxic doses on cognitive function in mammals are unknown. In this study, the effects of different doses of imidacloprid on learning and memory of infant and adult rats were evaluated, and the expressions of genes synthesizing proteins known to be associated with learning in brain tissues were also documented. 0.5, 2 and 8 mg/kg doses of imidacloprid were administered to newborn infant and adult Wistar albino rats by gavage. Their learning activities were evaluated, and the expression levels of the inotropic glutamate receptor GRIN1, synoptophysin, growth-associated protein 43 and the muscarinic receptor M1 in hippocampus were determined by real-time PCR method. Learning activities were diminished significantly at 2 and 8 mg/kg doses in the infant model groups and at 8 mg/kg dose in adult rats. Also, expression levels of GRIN1, SYP and GAP-43 were found to be insignificantly altered. Only the expression of M1 were significantly changed in high doses of adult group. Thus imidacloprid in high doses causes deterioration in cognitive functions particularly in infant rats, and this deterioration may be associated with changes in the expressions of related genes.
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Affiliation(s)
- Murat Kara
- Department of Medical Genetics, Faculty of Medicine, Mugla Sitki Kocman University, Mugla, Turkey
| | - Onder Yumrutas
- Department of Medical Biology, Faculty of Medicine, Adiyaman University, Adiyaman, Turkey
| | - Caner F Demir
- Department of Neurology, Faculty of Medicine, Fırat University, Elazıg, Turkey
| | | | - Ibrahim Bozgeyik
- Department of Medical Biology, Faculty of Medicine, Adiyaman University, Adiyaman, Turkey
| | - Salih Coskun
- Department of Medical Genetics, Faculty of Medicine, Dicle University, Diyarbakır, Turkey
| | - Ersen Eraslan
- Department of Physicology, Faculty of Medicine, Ataturk University, Erzurum, Turkey
| | - Ramazan Bal
- Department of Physicology, Faculty of Medicine, Gaziantep University, Gaziantep, Turkey
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18
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Savy CY, Fitchett AE, McQuade R, Gartside SE, Morris CM, Blain PG, Judge SJ. Low-level repeated exposure to diazinon and chlorpyrifos decrease anxiety-like behaviour in adult male rats as assessed by marble burying behaviour. Neurotoxicology 2015; 50:149-56. [PMID: 26297601 DOI: 10.1016/j.neuro.2015.08.010] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Revised: 08/14/2015] [Accepted: 08/14/2015] [Indexed: 11/19/2022]
Abstract
Occupational exposure to organophosphate (OPs) pesticides is reported to increase in the risk of developing anxiety and depression. Preclinical studies using OP levels, which inhibit acetylcholinesterase activity, support the clinical observations, but little is known of the effects of exposure below this threshold. We examined the effects of low level OP exposure on behaviours and neurochemistry associated with affective disorders. Adult rats were administered either diazinon (1 mg/kg i.p.) which is present in sheep dip and flea collars, chlorpyrifos (1 mg/kg i.p.) which is present in crop sprays, or vehicle for 5 days. OP exposure did not affect acetylcholinesterase activity (blood, cerebellum, caudate putamen, hippocampus, prefrontal cortex), anhedonia-like behaviour (sucrose preference), working memory (novel object recognition), locomotor activity or anxiety-like behaviour in the open field arena. In contrast OP exposure attenuated marble burying behaviour, an ethological measure of anxiety. The diazinon-induced reduction in marble burying persisted after exposure cessation. In comparison to vehicle, dopamine levels were lowered by chlorpyrifos, but not diazinon. 5-HT levels and turnover were unaffected by OP exposure. However, 5-HT transporter expression was reduced by diazinon suggesting subtle changes in 5-HT transmission. These data indicate exposure to occupational and domestic OPs, below the threshold to inhibit acetylcholinesterase, can subtly alter behaviour and neurochemistry.
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Affiliation(s)
- Claire Y Savy
- Medical Toxicology Centre, Newcastle University, Claremont Place, Newcastle upon Tyne NE2 4AA, UK; Institute of Neuroscience, Newcastle University, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
| | - Ann E Fitchett
- Medical Toxicology Centre, Newcastle University, Claremont Place, Newcastle upon Tyne NE2 4AA, UK; Institute of Neuroscience, Newcastle University, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
| | - Richard McQuade
- Institute of Neuroscience, Newcastle University, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
| | - Sarah E Gartside
- Institute of Neuroscience, Newcastle University, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
| | - Christopher M Morris
- Medical Toxicology Centre, Newcastle University, Claremont Place, Newcastle upon Tyne NE2 4AA, UK; Institute of Neuroscience, Newcastle University, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
| | - Peter G Blain
- Medical Toxicology Centre, Newcastle University, Claremont Place, Newcastle upon Tyne NE2 4AA, UK; Institute of Neuroscience, Newcastle University, Framlington Place, Newcastle upon Tyne NE2 4HH, UK
| | - Sarah J Judge
- Medical Toxicology Centre, Newcastle University, Claremont Place, Newcastle upon Tyne NE2 4AA, UK; Institute of Neuroscience, Newcastle University, Framlington Place, Newcastle upon Tyne NE2 4HH, UK.
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19
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Hernandez CM, Beck WD, Naughton SX, Poddar I, Adam BL, Yanasak N, Middleton C, Terry AV. Repeated exposure to chlorpyrifos leads to prolonged impairments of axonal transport in the living rodent brain. Neurotoxicology 2015; 47:17-26. [PMID: 25614231 DOI: 10.1016/j.neuro.2015.01.002] [Citation(s) in RCA: 48] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2014] [Revised: 01/06/2015] [Accepted: 01/11/2015] [Indexed: 01/07/2023]
Abstract
The toxicity of the class of chemicals known as the organophosphates (OP) is most commonly attributed to the inhibition of the enzyme acetylcholinesterase. However, there is significant evidence that this mechanism may not account for all of the deleterious neurologic and neurobehavioral symptoms of OP exposure, especially those associated with levels that produce no overt signs of acute toxicity. In the study described here we evaluated the effects of the commonly used OP-pesticide, chlorpyrifos (CPF) on axonal transport in the brains of living rats using manganese (Mn(2+))-enhanced magnetic resonance imaging (MEMRI) of the optic nerve (ON) projections from the retina to the superior colliculus (SC). T1-weighted MEMRI scans were evaluated at 6 and 24h after intravitreal injection of Mn(2+). As a positive control for axonal transport deficits, initial studies were conducted with the tropolone alkaloid colchicine administered by intravitreal injection. In subsequent studies both single and repeated exposures to CPF were evaluated for effects on axonal transport using MEMRI. As expected, intravitreal injection of colchicine (2.5μg) produced a robust decrease in transport of Mn(2+) along the optic nerve (ON) and to the superior colliculus (SC) (as indicated by the reduced MEMRI contrast). A single subcutaneous (s.c.) injection of CPF (18.0mg/kg) was not associated with significant alterations in the transport of Mn(2+). Conversely, 14-days of repeated s.c. exposure to CPF (18.0mg/kg/day) was associated with decreased transport of Mn(2+) along the ONs and to the SC, an effect that was also present after a 30-day (CPF-free) washout period. These results indicate that repeated exposures to a commonly used pesticide, CPF can result in persistent alterations in axonal transport in the living mammalian brain. Given the fundamental importance of axonal transport to neuronal function, these observations may (at least in part) explain some of the long term neurological deficits that have been observed in humans who have been repeatedly exposed to doses of OPs not associated with acute toxicity.
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Affiliation(s)
- Caterina M Hernandez
- Department of Pharmacology and Toxicology, Georgia Regents University, Augusta, GA 30912, United States
| | - Wayne D Beck
- Department of Pharmacology and Toxicology, Georgia Regents University, Augusta, GA 30912, United States
| | - Sean X Naughton
- Department of Pharmacology and Toxicology, Georgia Regents University, Augusta, GA 30912, United States
| | - Indrani Poddar
- Department of Pharmacology and Toxicology, Georgia Regents University, Augusta, GA 30912, United States
| | - Bao-Ling Adam
- Department of Pharmacology and Toxicology, Georgia Regents University, Augusta, GA 30912, United States
| | - Nathan Yanasak
- Core Imaging Facility for Small Animals (CIFSA), Georgia Regents University, Augusta, GA 30912, United States
| | - Chris Middleton
- Core Imaging Facility for Small Animals (CIFSA), Georgia Regents University, Augusta, GA 30912, United States
| | - Alvin V Terry
- Department of Pharmacology and Toxicology, Georgia Regents University, Augusta, GA 30912, United States.
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20
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Grabovska SV, Salyha YT. [THE EFFECT OF CHRONIC INTOXICATION WITH LOW DOSES OF CHLORPYRIFOS ON THE BEHAVIORAL PARAMETERS OF FEMALE RATS]. FIZIOLOHICHNYI ZHURNAL (KIEV, UKRAINE : 1994) 2015; 61:94-101. [PMID: 26387166 DOI: 10.15407/fz61.02.094] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We explored the effect of chronic chlorpyrifos intake on the behavior of female laboratory rats. The animals were exposed to chlorpyrifos in doses 5 and 10 mg/kg daily for a month long and tested with behavioral tests: Morris water maze, Open field test, and Dark/light box. Everyday chlorpyrifos intake in dose 10 mg/kg was revealed to cause long- and short-term spatial memory lesion, decrease in total activity, sharp changes in the level of anxiety (it significantly increased at the start of xenobiotic intake, and then normalized with time). Similar trends, though less intense, were observed in the group exposed to 5 mg/kg chlorpyrifos. From the survey results it can be concluded that long-term (30 days long) intake of even low doses of chlorpyrifos can cause adverse effects on the functional state of nervous system.
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21
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Deshpande LS, Phillips K, Huang B, DeLorenzo RJ. Chronic behavioral and cognitive deficits in a rat survival model of paraoxon toxicity. Neurotoxicology 2014; 44:352-7. [PMID: 25172410 DOI: 10.1016/j.neuro.2014.08.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2014] [Revised: 08/07/2014] [Accepted: 08/08/2014] [Indexed: 01/15/2023]
Abstract
Organophosphate (OP) compounds, including paraoxon (POX), are similar to nerve agents such as sarin. There is a growing concern that OP agents could be weaponized to cause mass civilian causalities. We have developed a rodent survival model of POX toxicity that is being used to evaluate chronic morbidity and to screen for medical countermeasures against severe OP exposure. It is well known that the survivors of nerve gas and chronic OP exposure exhibit neurobehavioral deficits such as mood changes, depression, and memory impairments. In this study we investigated whether animals surviving severe POX exposure exhibited long-term neurological impairments. POX exposure produced overt signs of cholinergic toxicity. Rats were rescued using an optimized atropine, 2-PAM and diazepam therapy. Surviving rats were studied using established behavioral assays for identifying symptoms of depression and memory impairment 3-months after POX exposure. In the forced swim test, POX rats exhibited increased immobility time indicative of a despair-like state. In the sucrose preference test, POX rats consumed significantly less sucrose water indicating anhedonia-like condition. POX rats also displayed increased anxiety as characterized by significantly lower performance in the open arm of the elevated plus maze. Further, when tested with a novel object recognition paradigm, POX rats exhibited a negative discrimination ratio indicative of impaired recognition memory. The results indicate that this model of survival from severe POX exposure can be employed to study some of the molecular bases for OP-induced chronic behavioral and cognitive comorbidities and develop therapies for their treatment.
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Affiliation(s)
| | - Kristin Phillips
- Department of Neurology, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Beverly Huang
- Department of Neuroscience, Virginia Commonwealth University, Richmond, VA 23298, USA
| | - Robert J DeLorenzo
- Department of Neurology, Virginia Commonwealth University, Richmond, VA 23298, USA; Department of Pharmacology and Toxicology, Virginia Commonwealth University, Richmond, VA 23298, USA; Department of Molecular Biophysics and Biochemistry, Virginia Commonwealth University, Richmond, VA 23298, USA.
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22
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Terry AV, Callahan PM, Beck WD, Vandenhuerk L, Sinha S, Bouchard K, Schade R, Waller JL. Repeated exposures to diisopropylfluorophosphate result in impairments of sustained attention and persistent alterations of inhibitory response control in rats. Neurotoxicol Teratol 2014; 44:18-29. [PMID: 24819591 PMCID: PMC4099306 DOI: 10.1016/j.ntt.2014.04.069] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2013] [Revised: 04/28/2014] [Accepted: 04/30/2014] [Indexed: 11/30/2022]
Abstract
Organophosphate (OP)-based chemicals are used worldwide for many purposes and they have likely saved millions of people from starvation and disease. However, due to their toxicity they can also pose a significant environmental risk. While considerable research has focused on the acute symptoms and long-term consequences of overtly toxic exposures to OPs, less attention has been given to the subject of repeated exposures to levels that are not associated with acute symptoms (subthreshold exposures). There is clinical evidence indicating that this type of OP exposure can lead to prolonged deficits in cognition; however only a few studies have addressed this issue prospectively in animal models. In this study, repeated subthreshold exposures to the OP nerve agent diisopropylfluorophosphate (DFP) were evaluated in a 5-Choice Serial Reaction Time Task (5C-SRTT), an animal model of sustained attention. Adult rats were trained to stably perform the 5C-SRTT and then injected subcutaneously with vehicle or DFP of 0.5mg/kg every other day for 30days. Behavioral testing occurred daily during the DFP-exposure period and throughout a 45day (OP-free) washout period. Compared to vehicle-treated controls, DFP-treated rats exhibited deficits in accuracy, increases in omissions and timeout responses during the OP exposure period, while no significant effects on premature responses, perseverative responses, or response latencies were noted. While the increase in timeout responses remained detectible during washout, all other DFP-related alterations in 5C-SRTT performance abated. When the demands of the task were increased by the presentation of variable intertrial intervals, premature responses were also elevated in DFP-treated rats during the washout period. These results indicate that repeated exposures to subthreshold doses of DFP lead to reversible impairments in sustained attention as well as persistent impairments of inhibitory response control in rats.
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Affiliation(s)
- Alvin V Terry
- Department of Pharmacology and Toxicology, Georgia Regents University, Augusta, GA 30912, United States; Small Animal Behavior Core, Georgia Regents University, Augusta, GA 30912, United States.
| | - Patrick M Callahan
- Department of Pharmacology and Toxicology, Georgia Regents University, Augusta, GA 30912, United States; Small Animal Behavior Core, Georgia Regents University, Augusta, GA 30912, United States
| | - Wayne D Beck
- Department of Pharmacology and Toxicology, Georgia Regents University, Augusta, GA 30912, United States
| | - Leah Vandenhuerk
- Small Animal Behavior Core, Georgia Regents University, Augusta, GA 30912, United States
| | - Samantha Sinha
- Small Animal Behavior Core, Georgia Regents University, Augusta, GA 30912, United States
| | - Kristy Bouchard
- Small Animal Behavior Core, Georgia Regents University, Augusta, GA 30912, United States
| | - Rose Schade
- Small Animal Behavior Core, Georgia Regents University, Augusta, GA 30912, United States
| | - Jennifer L Waller
- Department of Biostatistics, Georgia Regents University, Augusta, GA 30912, United States
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23
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Akande MG, Aliu YO, Ambali SF, Ayo JO. Taurine mitigates cognitive impairment induced by chronic co-exposure of male Wistar rats to chlorpyrifos and lead acetate. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2014; 37:315-325. [PMID: 24394474 DOI: 10.1016/j.etap.2013.11.023] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2013] [Revised: 10/28/2013] [Accepted: 11/20/2013] [Indexed: 06/03/2023]
Abstract
Organophosphate pesticides and heavy metals are ubiquitous environmental pollutants and neurotoxicants. We investigated the effects of taurine (an antioxidant; TA) on oxidative stress and cognition in male Wistar rats co-treated with chlorpyrifos (an organophosphate pesticide; CPF) and lead acetate (heavy metal; LA). The Wistar rats were divided into 5 groups of 10 rats each. The first two groups were administered with distilled water and soya oil respectively. The remaining three groups were administered with taurine (TA), 50 mg/kg body weight, CPF+LA group [CPF (4.25 mg/kg, 1/20 LD₅₀] and LA (233.25 mg/kg, 1/20 LD₅₀) and TA+CPF+LA group [TA (50 mg/kg), CPF (4.25 mg/kg) and LA (233.25 mg/kg)]. The xenobiotics were administered once daily by oral gavage for 16 weeks. The results showed reductions in the activities of brain antioxidant enzymes and acetylcholinesterase, increased lipoperoxidation and histopathological alterations of the cerebral cortex in the CPF+LA group. However, TA mitigated perturbations in the activities of the antioxidant enzymes and acetylcholinesterase, counteracted oxidative stress and brain lipoperoxidation and attenuated neuronal degeneration induced by joint CPF and LA-induced neurotoxicity. The results suggested that TA is neuroprotective following chronic co-exposure of rats to CPF and LA.
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Affiliation(s)
- M G Akande
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, University of Abuja, Nigeria.
| | - Y O Aliu
- Department of Physiology and Pharmacology, Faculty of Veterinary Medicine, Ahmadu Bello University, Zaria, Nigeria.
| | - S F Ambali
- Department of Physiology and Pharmacology, Faculty of Veterinary Medicine, University of Ilorin, Ilorin, Nigeria.
| | - J O Ayo
- Department of Physiology and Pharmacology, Faculty of Veterinary Medicine, Ahmadu Bello University, Zaria, Nigeria.
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