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Fine JD, Cox-Foster DL, Moor KJ, Chen R, Avalos A. Trisiloxane Surfactants Negatively Affect Reproductive Behaviors and Enhance Viral Replication in Honey Bees. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2024; 43:222-233. [PMID: 37861380 DOI: 10.1002/etc.5771] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 09/06/2023] [Accepted: 10/18/2023] [Indexed: 10/21/2023]
Abstract
Trisiloxane surfactants are often applied in formulated adjuvant products to blooming crops, including almonds, exposing the managed honey bees (Apis mellifera) used for pollination of these crops and persisting in colony matrices, such as bee bread. Despite this, little is known regarding the effects of trisiloxane surfactants on important aspects of colony health, such as reproduction. In the present study, we use laboratory assays to examine how exposure to field-relevant concentrations of three trisiloxane surfactants found in commonly used adjuvant formulations affect queen oviposition rates, worker interactions with the queen, and worker susceptibility to endogenous viral pathogens. Trisiloxane surfactants were administered at 5 mg/kg in pollen supplement diet for 14 days. No effects on worker behavior or physiology could be detected, but our results demonstrate that hydroxy-capped trisiloxane surfactants can negatively affect queen oviposition and methyl-capped trisiloxane surfactants cause increased replication of Deformed Wing Virus in workers, suggesting that trisiloxane surfactant use while honey bees are foraging may negatively impact colony longevity and growth. Environ Toxicol Chem 2024;43:222-233. © 2023 SETAC. This article has been contributed to by U.S. Government employees and their work is in the public domain in the USA.
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Affiliation(s)
- Julia D Fine
- US Department of Agriculture-Agricultural Research Service Invasive Species and Pollinator Health Research Unit, Davis, California, USA
| | - Diana L Cox-Foster
- US Department of Agriculture-Agricultural Research Service Pollinating Insect Research Unit, Logan, Utah, USA
| | - Kyle J Moor
- Utah Water Research Laboratory, Department of Civil and Environmental Engineering, Utah State University, Logan, Utah, USA
| | - Ruiwen Chen
- Department of Civil and Environmental Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania, USA
| | - Arian Avalos
- US Department of Agriculture-Agricultural Research Service Honey Bee Breeding, Genetics, and Physiology Research Laboratory, Baton Rouge, Louisiana, USA
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2
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Lin F, Mao Y, Zhao F, Idris AL, Liu Q, Zou S, Guan X, Huang T. Towards Sustainable Green Adjuvants for Microbial Pesticides: Recent Progress, Upcoming Challenges, and Future Perspectives. Microorganisms 2023; 11:microorganisms11020364. [PMID: 36838328 PMCID: PMC9965284 DOI: 10.3390/microorganisms11020364] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 01/28/2023] [Accepted: 01/29/2023] [Indexed: 02/04/2023] Open
Abstract
Microbial pesticides can be significantly improved by adjuvants. At present, microbial pesticide formulations are mainly wettable powders and suspension concentrations, which are usually produced with adjuvants such as surfactants, carriers, protective agents, and nutritional adjuvants. Surfactants can improve the tension between liquid pesticides and crop surfaces, resulting in stronger permeability and wettability of the formulations. Carriers are inert components of loaded or diluted pesticides, which can control the release of active components at appropriate times. Protective agents are able to help microorganisms to resist in adverse environments. Nutritional adjuvants are used to provide nutrients for microorganisms in microbial pesticides. Most of the adjuvants used in microbial pesticides still refer to those of chemical pesticides. However, some adjuvants may have harmful effects on non-target organisms and ecological environments. Herein, in order to promote research and improvement of microbial pesticides, the types of microbial pesticide formulations were briefly reviewed, and research progress of adjuvants and their applications in microbial pesticides were highlighted, the challenges and the future perspectives towards sustainable green adjuvants of microbial pesticides were also discussed in this review.
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Wu X, Nguyen H, Kim D, Peng H. Chronic toxicity of PFAS-free AFFF alternatives in terrestrial plant Brassica rapa. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 850:158100. [PMID: 35987222 DOI: 10.1016/j.scitotenv.2022.158100] [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: 06/27/2022] [Revised: 08/13/2022] [Accepted: 08/13/2022] [Indexed: 06/15/2023]
Abstract
Fluorine (F)-free firefighting foams will be replacing per- and polyfluoroalkyl substances (PFAS)-containing aqueous film-forming foams (AFFFs) at U.S. military installations imminently, yet the environmental impacts of F-free foams are largely unknown. Ecotoxicity assessment of F-free foams is urgently needed to avoid replacement regret. In this study, we comparatively assessed phytotoxicity of six F-free formulations and one current short-chain fluorinated AFFF in terrestrial plant Brassica rapa. Five of six F-free formulations exerted higher toxicity than the short-chain AFFF to the growth and reproduction of B. rapa, with 8-51 times and > 10 times lower EC50 values, respectively. Nontargeted analysis indicated the occurrence of transformation products of the test formulations in the above-ground plant tissues. In agreement with their phytotoxicity, the five highly toxic F-free formulations generated more transformation products with higher peak intensities in plant tissues than the two weakly toxic formulations. The most abundant transformation products detected in plant extracts were suspect transformation products derived from diethylene glycol monobutyl ether, a common ingredient of the five toxic formulations. This study provides ecotoxicological data that, combined with data from all related ongoing research, should be used in decision making regarding recommendations for manufacturing and use of candidate F-free foams.
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Affiliation(s)
- Xiaoqin Wu
- Climate and Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
| | - Helen Nguyen
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada
| | - Damian Kim
- Climate and Ecosystem Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA; University of California, Berkeley, CA 94720, USA
| | - Hui Peng
- Department of Chemistry, University of Toronto, Toronto, Ontario M5S 3H6, Canada; School of the Environment, University of Toronto, Toronto, Ontario M5S 3H6, Canada.
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RNAi as a Foliar Spray: Efficiency and Challenges to Field Applications. Int J Mol Sci 2022; 23:ijms23126639. [PMID: 35743077 PMCID: PMC9224206 DOI: 10.3390/ijms23126639] [Citation(s) in RCA: 19] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 06/10/2022] [Accepted: 06/13/2022] [Indexed: 02/04/2023] Open
Abstract
RNA interference (RNAi) is a powerful tool that is being increasingly utilized for crop protection against viruses, fungal pathogens, and insect pests. The non-transgenic approach of spray-induced gene silencing (SIGS), which relies on spray application of double-stranded RNA (dsRNA) to induce RNAi, has come to prominence due to its safety and environmental benefits in addition to its wide host range and high target specificity. However, along with promising results in recent studies, several factors limiting SIGS RNAi efficiency have been recognized in insects and plants. While sprayed dsRNA on the plant surface can produce a robust RNAi response in some chewing insects, plant uptake and systemic movement of dsRNA is required for delivery to many other target organisms. For example, pests such as sucking insects require the presence of dsRNA in vascular tissues, while many fungal pathogens are predominately located in internal plant tissues. Investigating the mechanisms by which sprayed dsRNA enters and moves through plant tissues and understanding the barriers that may hinder this process are essential for developing efficient ways to deliver dsRNA into plant systems. In this review, we assess current knowledge of the plant foliar and cellular uptake of dsRNA molecules. We will also identify major barriers to uptake, including leaf morphological features as well as environmental factors, and address methods to overcome these barriers.
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Costas-Ferreira C, Durán R, Faro LRF. Toxic Effects of Glyphosate on the Nervous System: A Systematic Review. Int J Mol Sci 2022; 23:4605. [PMID: 35562999 PMCID: PMC9101768 DOI: 10.3390/ijms23094605] [Citation(s) in RCA: 46] [Impact Index Per Article: 23.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2022] [Revised: 04/11/2022] [Accepted: 04/18/2022] [Indexed: 12/21/2022] Open
Abstract
Glyphosate, a non-selective systemic biocide with broad-spectrum activity, is the most widely used herbicide in the world. It can persist in the environment for days or months, and its intensive and large-scale use can constitute a major environmental and health problem. In this systematic review, we investigate the current state of our knowledge related to the effects of this pesticide on the nervous system of various animal species and humans. The information provided indicates that exposure to glyphosate or its commercial formulations induces several neurotoxic effects. It has been shown that exposure to this pesticide during the early stages of life can seriously affect normal cell development by deregulating some of the signaling pathways involved in this process, leading to alterations in differentiation, neuronal growth, and myelination. Glyphosate also seems to exert a significant toxic effect on neurotransmission and to induce oxidative stress, neuroinflammation and mitochondrial dysfunction, processes that lead to neuronal death due to autophagy, necrosis, or apoptosis, as well as the appearance of behavioral and motor disorders. The doses of glyphosate that produce these neurotoxic effects vary widely but are lower than the limits set by regulatory agencies. Although there are important discrepancies between the analyzed findings, it is unequivocal that exposure to glyphosate produces important alterations in the structure and function of the nervous system of humans, rodents, fish, and invertebrates.
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Affiliation(s)
| | | | - Lilian R. F. Faro
- Department of Functional Biology and Health Sciences, Faculty of Biology, Universidade de Vigo, Campus Lagoas-Marcosende, 36310 Vigo, Spain; (C.C.-F.); (R.D.)
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Mutagenicity Assessment to Pesticide Adjuvants of Toluene, Chloroform, and Trichloroethylene by Ames Test. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph18158095. [PMID: 34360388 PMCID: PMC8345808 DOI: 10.3390/ijerph18158095] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2021] [Revised: 07/26/2021] [Accepted: 07/27/2021] [Indexed: 11/16/2022]
Abstract
Pesticide adjuvants (PAs) denote the general term for auxiliaries in pesticide preparations except for the active components. Toluene, chloroform, and trichloroethylene are the three most commonly used PAs as organic solvents. The residues of the three chemicals in the process of production and application of pesticides may endanger the ecosystem. In the present study, the mutagenicity of toluene, chloroform, and trichloroethylene as well the mixture of the three chemicals was tested by the Salmonella typhimurium reverse mutation test (Ames test) with TA97, TA98, TA100, and TA102 strains in the system with and without rat liver microsomal preparations (S9). The four tester strains have been used for more than 40 years to detect mutagenic compounds in chemicals, cosmetics, and environmental samples. The mutagenicity was detected on tester strains in the separated experiment from the three chemicals. The addition of S9 decreased the mutation ratios of toluene to four strains, except for the TA100 strain, but increased the mutation ratios of chloroform to four strains except for the TA98 strain. Trichloroethylene caused positive mutagenicity to become negative on the TA102 strain. In the mixed experiment, positive effects were detected only on the TA102 strain in the absence of S9. The addition of S9 increased the mutagenicity except for the TA102 strain. The mixture of toluene, chloroform, and trichloroethylene showed antagonism in mutagenicity to tester strains, except for the TA102 strain without S9. However, the mixture showed a synergistic effect to tester strains after adding S9 except for the TA98 strain.
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Nagy K, Argaw Tessema R, Szász I, Smeirat T, Al Rajo A, Ádám B. Micronucleus Formation Induced by Glyphosate and Glyphosate-Based Herbicides in Human Peripheral White Blood Cells. Front Public Health 2021; 9:639143. [PMID: 34109144 PMCID: PMC8180907 DOI: 10.3389/fpubh.2021.639143] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2020] [Accepted: 04/23/2021] [Indexed: 11/28/2022] Open
Abstract
Glyphosate is the most commonly used herbicide around the world, which led to its accumulation in the environment and consequent ubiquitous human exposure. Glyphosate is marketed in numerous glyphosate-based herbicide formulations (GBHs) that include co-formulants to enhance herbicidal effect of the active ingredient, but are declared as inert substances. However, these other ingredients can have biologic activity on their own and may interact with the glyphosate in synergistic toxicity. In this study, we focused to compare the cytogenetic effect of the active ingredient glyphosate and three marketed GBHs (Roundup Mega, Fozat 480, and Glyfos) by investigating cytotoxicity with fluorescent co-labeling and WST-1 cell viability assay as well as genotoxicity with cytokinesis block micronucleus assay in isolated human mononuclear white blood cells. Glyphosate had no notable cytotoxic activity over the tested concentration range (0-10,000 μM), whereas all the selected GBHs induced significant cell death from 1,000 μM regardless of metabolic activation (S9). Micronucleus (MN) formation induced by glyphosate and its formulations at sub-cytotoxic concentrations (0-100 μM) exhibited a diverse pattern. Glyphosate caused statistically significant increase of MN frequency at the highest concentration (100 μM) after 20-h exposure. Contrarily, Roundup Mega exerted a significant genotoxic effect at 100 μM both after 4- and 20-h exposures; moreover, Glyfos and Fozat 480 also resulted in a statistically significant increase of MN frequency from the concentration of 10 μM after 4-h and 20-h treatment, respectively. The presence of S9 had no effect on MN formation induced by either glyphosate or GBHs. The differences observed in the cytotoxic and genotoxic pattern between the active principle and formulations confirm the previous concept that the presence of co-formulants in the formulations or the interaction of them with the active ingredient is responsible for the increased toxicity of herbicide products, and draw attention to the fact that GBHs are still currently in use, the toxicity of which rivals that of POEA-containing formulations (e.g., Glyfos) already banned in Europe. Hence, it is advisable to subject them to further comprehensive toxicological screening to assess the true health risks of exposed individuals, and to reconsider their free availability to any users.
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Affiliation(s)
- Károly Nagy
- Department of Public Health and Epidemiology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Roba Argaw Tessema
- Department of Public Health and Epidemiology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
- Doctoral School of Health Sciences, University of Debrecen, Debrecen, Hungary
| | - István Szász
- Department of Public Health and Epidemiology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
- Doctoral School of Health Sciences, University of Debrecen, Debrecen, Hungary
| | - Tamara Smeirat
- Department of Public Health and Epidemiology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Alaa Al Rajo
- Department of Public Health and Epidemiology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
| | - Balázs Ádám
- Department of Public Health and Epidemiology, Faculty of Medicine, University of Debrecen, Debrecen, Hungary
- College of Medicine and Health Sciences, Institute of Public Health, United Arab Emirates University, Al Ain, United Arab Emirates
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8
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Jho EH, Yun SH, Thapa P, Nam JW. Changes in the aquatic ecotoxicological effects of Triton X-100 after UV photodegradation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:11224-11232. [PMID: 33113057 DOI: 10.1007/s11356-020-11362-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/21/2020] [Accepted: 10/21/2020] [Indexed: 06/11/2023]
Abstract
Various spray adjuvants including surfactants are widely used in agricultural pesticide formulations, and some of them may remain in soils and waters and impose more adverse effects than active pesticide ingredients on organisms. However, previous studies are more focused on the active pesticide ingredients than the adjuvants. Thus, this study investigates the changes in toxic effects of surfactants during photodegradation, which is one way of naturally degrading contaminants in natural waters. Triton X-100, a water-soluble non-ionic surfactant, was degraded using different types of UV radiation (UVA, UVB, and UVC), and the changes in the toxic effects were determined using bioluminescent bacteria and water flea. The Triton X-100 removals were negligible with UVA within 24 h, while its removal was 81% with UVB and almost complete with UVC. The NMR spectra indicated possible molecule rearrangement after photolysis. On the other hand, the toxic effects based on the mortality of Daphnia magna and the bioluminescence of Aliivibrio fischeri increased (i.e., lower EC50 values) after photodegradation, suggesting the generation of photoproducts that are likely to have higher toxic effects or higher bioavailability. Furthermore, the sensitivities of D. magna and A. fischeri for Triton X-100 and the photodegraded Triton X-100 were different. This study suggests that the changes in the chemical composition of the Triton X-100 containing water with photodegradation can lead to changes in the relative toxic effects on different aquatic organisms. Therefore, not only the management of parent compound (i.e., Triton X-100) but also the photoproducts generated from the parent compound need to be considered when managing water environment subject to photodegradation.
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Affiliation(s)
- Eun Hea Jho
- Department of Agricultural and Biological Chemistry, Chonnam National University, 77 Yongbong-ro, Buk-gu, Gwangju, 61186, South Korea.
| | - Seong Ho Yun
- Department of Environmental Science, Hankuk University of Foreign Studies, 81 Oedae-ro, Mohyeon-eup, Cheoin-gu, Youngin-si, Gyeonggi-do, 17035, South Korea
| | - Punam Thapa
- College of Pharmacy, Yeungnam University, Gyeongsan-si, Gyeongsangbukdo, 38541, South Korea
| | - Joo-Won Nam
- College of Pharmacy, Yeungnam University, Gyeongsan-si, Gyeongsangbukdo, 38541, South Korea
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Olsvik PA, Søfteland L. Mixture toxicity of chlorpyrifos-methyl, pirimiphos-methyl, and nonylphenol in Atlantic salmon ( Salmo salar) hepatocytes. Toxicol Rep 2020; 7:547-558. [PMID: 32373476 PMCID: PMC7191540 DOI: 10.1016/j.toxrep.2020.03.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2019] [Revised: 02/27/2020] [Accepted: 03/21/2020] [Indexed: 12/21/2022] Open
Abstract
Shotgun lipidomics points to combined effects on 18:0 and 18:1 lipid species. Combined effects seen on membrane phospholipids and TAG in salmon hepatocytes. Inhibited stearoyl CoA desaturase (SCD) and increased Δ6 desaturase (D6D) activity. Adjuvants may amend toxicity of active ingredient in pesticide formulations.
Pesticide formulations typically contain adjuvants added to enhance the performance of the active ingredient. Adjuvants may modify the bioavailability and toxicity of pesticides. In this study, the aim was to examine to which degree nonylphenol (NP) may interfere with the toxicity of two organophosphorus pesticides found in aquafeeds, chlorpyrifos-methyl (CPM) and pirimiphos-methyl (PPM). Atlantic salmon liver cells were exposed to these compounds singly or in combinations for 48 h using 3D cell cultures. Cytotoxicity, gene expression (RT-qPCR), and lipidomics endpoints were used to assess toxicity. The dose-response assessment showed that NP was the most toxic compound at equimolar concentrations (100 μM). Shotgun lipidomics pointed to a general pattern of elevated levels of saturated 18:0 fatty acids and declined levels of 18:1 monounsaturated fatty acids by the combined treatment. All three compounds had a distinct effect on membrane phospholipids, in particular on phosphatidylcholine (PC) and phosphatidylethanolamine (PE). Lipid species patterns predicted inhibited stearoyl CoA desaturase (SCD) activity and increased Δ6 desaturase (D6D) activity in co-treated cells. While all three compounds alone mitigated increased triacylglycerol (TAG) accumulation, combined treatment resulted in lower total TAG in the cells. Multivariate analysis with PLS regression showed significant combined effects for nine genes (d5d, d6d, scd, srebf2, vtg, esr1, cyp1, ugt1a, and cat) and four lipid species (FFA 22:5, LPC 18:0, TAG52:1-FA16:0, and TAG52:1-FA18:0). In summary, this study demonstrates that the adjuvant can be the main contributor to the toxicity of a mixture of two organophosphorus pesticides with relatively low toxicity in fish cells.
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Affiliation(s)
- Pål A Olsvik
- Nord University, Faculty of Biosciences and Aquaculture, Bodø, Norway.,Institute of Marine Research (IMR), Bergen, Norway
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10
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Nagy K, Tessema RA, Budnik LT, Ádám B. Comparative cyto- and genotoxicity assessment of glyphosate and glyphosate-based herbicides in human peripheral white blood cells. ENVIRONMENTAL RESEARCH 2019; 179:108851. [PMID: 31678731 DOI: 10.1016/j.envres.2019.108851] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2019] [Revised: 09/17/2019] [Accepted: 10/20/2019] [Indexed: 05/12/2023]
Abstract
Glyphosate is the most heavily applied active compound of agricultural pesticides. It is solely used in more than 750 different glyphosate-based herbicide formulations (GBHs) that also contain other substances, mostly presumed as inert by regulatory agencies. The toxicity of formulations is currently assessed substance by substance, neglecting possible combined effects in mixtures and many of the findings regarding the toxic effects of glyphosate and GBHs to human cells are inconsistent. This is the first study to investigate and compare the cyto- and genotoxic potential of the active ingredient glyphosate and GBHs in human mononuclear white blood (HMWB) cells. HMWB cells were treated for 4 h at 37 °C with increasing concentrations (1-1000 μM) of glyphosate alone and in three GBHs (Roundup Mega, Fozat 480 and Glyfos) to test cytotoxic effect with fluorescent colabelling and genotoxic effect with comet assay. In addition, each concentration was tested with and without metabolic activation using human liver S9 fraction. We found that glyphosate alone does not induce significant cytotoxicity and genotoxicity over the tested concentration range. Contrarily, GBHs induced statistically significant cell death from 250 μM (Roundup Mega and Glyfos) and 500 μM (Fozat 480), as well as statistically significant increase of DNA damage from 500 μM (Roundup Mega and Glyfos) and 750 μM (Fozat 480); however, the latter observation may not be explained by direct DNA injuries, rather due to the high level of cell death (>70%) exerted by the formulations. Metabolic activation significantly increased the DNA damage levels induced by Glyfos, but not of the other GBHs and of glyphosate. The differences observed in the toxic pattern of formulations and the active principle may be attributed to the higher cytotoxic activity of other ingredients in the formulations or to the interaction of them with the active ingredient glyphosate. Hence, further investigation of formulations is crucial for assessing the true health risks of occupational and environmental exposures.
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Affiliation(s)
- Károly Nagy
- Division of Occupational Health, Department of Preventive Medicine, Faculty of Public Health, University of Debrecen, Debrecen, Hungary.
| | - Roba Argaw Tessema
- Division of Occupational Health, Department of Preventive Medicine, Faculty of Public Health, University of Debrecen, Debrecen, Hungary
| | - Lygia Therese Budnik
- Translational Toxicology and Immunology Unit, Institute for Occupational and Maritime Medicine, University Medical Center Hamburg-Eppendorf, Hamburg, Germany
| | - Balázs Ádám
- Division of Occupational Health, Department of Preventive Medicine, Faculty of Public Health, University of Debrecen, Debrecen, Hungary
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Simões T, Novais SC, Natal-da-Luz T, Leston S, Rosa J, Ramos F, Pouca ASV, Freitas A, Barbosa J, Roelofs D, Sousa JP, van Straalen NM, Lemos MFL. Fate and effects of two pesticide formulations in the invertebrate Folsomia candida using a natural agricultural soil. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 675:90-97. [PMID: 31026647 DOI: 10.1016/j.scitotenv.2019.04.191] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2019] [Revised: 04/11/2019] [Accepted: 04/12/2019] [Indexed: 06/09/2023]
Abstract
Degradation rates of two widely used pesticides were assessed, and acute and chronic effects on a standard invertebrate species investigated. An herbicide (Montana®) and fungicide (Bravo500®) formulations were investigated and results were compared to the isolated active substances of each formulation (glyphosate and chlorothalonil, respectively). Tests were performed using the invertebrate Folsomia candida as test species and an agricultural natural soil. Degradation rate tests were determined under aerobic conditions at 20 ± 2 °C, using an ecologically relevant concentration of 5 mg (a.i.) kg-1 of soil for both chemicals. Results demonstrated degradation half-lives (DT50) of 2.2 days for Montana® and 2.8 days when pure glyphosate was tested. Values of 1.1 and 2.9 days were registered for Bravo500® and its active substance chlorothalonil, respectively. There were no effects on survival for the tested concentrations of both forms of the herbicide (up to 17.3 mg kg-1). However, reproduction was affected, but only by the herbicide formulation, with an estimated EC50 value of 4.63 mg (a.i.) kg-1. Effects were most unlikely related to glyphosate. For chlorothalonil, both tested forms affected survival and reproduction. The estimated LC50 values were 117 mg (a.i.) kg-1 and 73.5 mg (a.i.) kg-1, and the EC50 41.3 mg (a.i.) kg-1 and 14.9 mg kg-1 for the formulation and the active ingredient, respectively. The effects of the active ingredient were significantly stronger, indicating the major influence of the active substance in the effects caused also by the formulation. Overall results demonstrate the importance of evaluating the effects of the formulated chemicals, as they are applied in the field, and not only their isolated active ingredients.
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Affiliation(s)
- Tiago Simões
- MARE - Marine and Environmental Sciences Centre, ESTM, Polytechnic Institute of Leiria, Peniche, Portugal; CFE - Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Portugal; Department of Ecological Science, Vrije Universiteit, Amsterdam, Netherlands.
| | - Sara C Novais
- MARE - Marine and Environmental Sciences Centre, ESTM, Polytechnic Institute of Leiria, Peniche, Portugal; Department of Ecological Science, Vrije Universiteit, Amsterdam, Netherlands
| | - Tiago Natal-da-Luz
- CFE - Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Portugal
| | - Sara Leston
- MARE - Marine and Environmental Sciences Centre, ESTM, Polytechnic Institute of Leiria, Peniche, Portugal; CFE - Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Portugal; REQUIMTE/LAQV - Faculty of Pharmacy, University of Coimbra, Portugal
| | - João Rosa
- CFE - Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Portugal; REQUIMTE/LAQV - Faculty of Pharmacy, University of Coimbra, Portugal
| | - Fernando Ramos
- REQUIMTE/LAQV - Faculty of Pharmacy, University of Coimbra, Portugal
| | - Ana Sofia Vila Pouca
- INIAV - National Institute for Agrarian and Veterinary Research, I.P., Vila do Conde, Portugal
| | - Andreia Freitas
- INIAV - National Institute for Agrarian and Veterinary Research, I.P., Vila do Conde, Portugal
| | - Jorge Barbosa
- INIAV - National Institute for Agrarian and Veterinary Research, I.P., Vila do Conde, Portugal
| | - Dick Roelofs
- Department of Ecological Science, Vrije Universiteit, Amsterdam, Netherlands
| | - José P Sousa
- CFE - Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Portugal
| | - Nico M van Straalen
- Department of Ecological Science, Vrije Universiteit, Amsterdam, Netherlands
| | - Marco F L Lemos
- MARE - Marine and Environmental Sciences Centre, ESTM, Polytechnic Institute of Leiria, Peniche, Portugal
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12
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Vanlaeys A, Dubuisson F, Seralini GE, Travert C. Formulants of glyphosate-based herbicides have more deleterious impact than glyphosate on TM4 Sertoli cells. Toxicol In Vitro 2018; 52:14-22. [PMID: 29775650 DOI: 10.1016/j.tiv.2018.01.002] [Citation(s) in RCA: 50] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Revised: 12/20/2017] [Accepted: 01/03/2018] [Indexed: 11/28/2022]
Abstract
Roundup and Glyphogan are glyphosate-based herbicides containing the same concentration of glyphosate and confidential formulants. Formulants are declared as inert diluents but some are more toxic than glyphosate, such as the family of polyethoxylated alkylamines (POEA). We tested glyphosate alone, glyphosate-based herbicide formulations and POEA on the immature mouse Sertoli cell line (TM4), at concentrations ranging from environmental to agricultural-use levels. Our results show that formulations of glyphosate-based herbicides induce TM4 mitochondrial dysfunction (like glyphosate, but to a lesser extent), disruption of cell detoxification systems, lipid droplet accumulation and mortality at sub-agricultural doses. Formulants, especially those present in Glyphogan, are more deleterious than glyphosate and thus should be considered as active principles of these pesticides. Lipid droplet accumulation after acute exposure to POEA suggests the rapid penetration and accumulation of formulants, leading to mortality after 24 h. As Sertoli cells are essential for testicular development and normal onset of spermatogenesis, disturbance of their function by glyphosate-based herbicides could contribute to disruption of reproductive function demonstrated in mammals exposed to these pesticides at a prepubertal stage of development.
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Affiliation(s)
- Alison Vanlaeys
- Normandie Univ, F14032 Caen Cedex 5, France; University of Caen Normandy (UNICAEN), Faculty of Sciences, EA 2608, OeReCa, F-14032 Caen, France; University of Picardie Jules Verne, EA4667, Faculty of Sciences, F-80039 Amiens, France
| | - Florine Dubuisson
- Normandie Univ, F14032 Caen Cedex 5, France; University of Caen Normandy (UNICAEN), Faculty of Sciences, EA 2608, OeReCa, F-14032 Caen, France; UMR 85, INRA, CNRS, F-37380 Nouzilly, France
| | - Gilles-Eric Seralini
- Normandie Univ, F14032 Caen Cedex 5, France; University of Caen Normandy (UNICAEN), Faculty of Sciences, EA 2608, OeReCa, F-14032 Caen, France; Network on Risks, Quality and Sustainable Environment MRSH, F-14032 Caen, France
| | - Carine Travert
- Normandie Univ, F14032 Caen Cedex 5, France; University of Caen Normandy (UNICAEN), Faculty of Sciences, EA 2608, OeReCa, F-14032 Caen, France.
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13
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Noorimotlagh Z, Mirzaee SA, Ahmadi M, Jaafarzadeh N, Rahim F. The possible DNA damage induced by environmental organic compounds: The case of Nonylphenol. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2018; 158:171-181. [PMID: 29684747 DOI: 10.1016/j.ecoenv.2018.04.023] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/03/2017] [Revised: 04/08/2018] [Accepted: 04/10/2018] [Indexed: 06/08/2023]
Abstract
Human impact on the environment leads to the release of many pollutants that produce artificial compounds, which can have harmful effects on the body's endocrine system; these are known as endocrine disruptors (EDs). Nonylphenol (NP) is a chemical compound with a nonyl group that is attached to a phenol ring. NP-induced H2AX is a sensitive genotoxic biomarker for detecting possible DNA damage; it also causes male infertility and carcinogenesis. We attempt to comprehensively review all the available evidence about the different ways with descriptive mechanisms for explaining the possible DNA damage that is induced by NP. We systematically searched several databases, including PubMed, Scopus, Web of Science, and gray literature, such as Google Scholar by using medical subheading (MeSH) terms and various combinations of selected keywords from January 1970 to August 2017. The initial search identified 62,737 potentially eligible studies; of these studies, 33 were included according to the established inclusion criteria. Thirty-three selected studies, include the topics of animal model (n = 21), cell line (n = 6), human model (n = 4), microorganisms (n = 1), solid DNA (n = 1), infertility (n = 4), apoptosis (n = 6), and carcinogenesis (n = 3). This review highlighted the possible deleterious effects of NP on DNA damage through the ability to produce ROS/RNS. Finally, it is significant to observe caution at this stage with the continued use of environmental pollutants such as NP, which may induce DNA damage and apoptosis.
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Affiliation(s)
- Zahra Noorimotlagh
- Student Research Committee, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran; Environmental Technologies Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
| | - Seyyed Abbas Mirzaee
- Department of Environmental Health Engineering, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
| | - Mehdi Ahmadi
- Environmental Technologies Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran; Department of Environmental Health Engineering, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
| | - Neemat Jaafarzadeh
- Environmental Technologies Research Center, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran; Department of Environmental Health Engineering, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
| | - Fakher Rahim
- Health Research Institute, Thalassemia and Hemoglobinopathies Research Centre, Ahvaz Jundishapur University of Medical Sciences, Ahvaz, Iran.
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14
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de Santo FB, Ramos GA, Ricardo Filho AM, Marchioro CA, Niemeyer JC. Screening effects of metsulfuron-methyl to collembolans and earthworms: the role of adjuvant addition on ecotoxicity. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:24143-24149. [PMID: 29948693 DOI: 10.1007/s11356-018-2481-5] [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: 04/13/2018] [Accepted: 06/01/2018] [Indexed: 06/08/2023]
Abstract
Metsulfuron-methyl is a common active ingredient recommended for use in pre- and post-emergence control of annual grasses and broadleaf weeds in crops, usually applied with mineral oil as adjuvant to enhance its efficiency. Despite the increasing use of this herbicide, there are no information on its ecotoxicity effects to soil fauna. Avoidance and lethality tests were performed with earthworms and collembolans using tropical artificial soil contaminated with formulated products Ally® (600 g L-1 metsulfuron-methyl) and Assist® (756 g L-1 mineral oil) as adjuvant. Lethality test with earthworms showed no difference when tested with or without adjuvant. When Ally® was tested alone, it caused avoidance behavior only at high concentrations (5000 and 10,000 times field predicted dose). However, Assist® addition changed the response of soil invertebrates increasing the avoidance even at field predicted doses. The toxicity of the adjuvant was confirmed in tests exposing collembolans and earthworms to Assist® alone resulting in avoidance behavior. The results clearly show that the addition of mineral oil enhanced the ecotoxicity of metsulfuron-methyl. This study provides an important contribution to the knowledge on the toxicity of metsulfuron-methyl and indicates that adjuvants should be considered in risk assessment of pesticides, considering that under field conditions, these products are applied together.
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Affiliation(s)
- Fernanda Benedet de Santo
- Programa de Pós-Graduação em Ecossistemas Agrícolas e Naturais (PPGEAN), Federal University of Santa Catarina, Rodovia Ulysses Gaboardi, Km 3, Campus of Curitibanos, Curitibanos, 89520-000, Brazil.
| | - Guilherme Alves Ramos
- Federal University of Santa Catarina, Campus of Curitibanos, Curitibanos, 89520-000, Brazil
| | | | - Cesar Augusto Marchioro
- Programa de Pós-Graduação em Ecossistemas Agrícolas e Naturais (PPGEAN), Federal University of Santa Catarina, Rodovia Ulysses Gaboardi, Km 3, Campus of Curitibanos, Curitibanos, 89520-000, Brazil
- Federal University of Santa Catarina, Campus of Curitibanos, Curitibanos, 89520-000, Brazil
| | - Júlia Carina Niemeyer
- Programa de Pós-Graduação em Ecossistemas Agrícolas e Naturais (PPGEAN), Federal University of Santa Catarina, Rodovia Ulysses Gaboardi, Km 3, Campus of Curitibanos, Curitibanos, 89520-000, Brazil
- Federal University of Santa Catarina, Campus of Curitibanos, Curitibanos, 89520-000, Brazil
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15
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Simões T, Novais SC, Natal-da-Luz T, Devreese B, de Boer T, Roelofs D, Sousa JP, van Straalen NM, Lemos MFL. An integrative omics approach to unravel toxicity mechanisms of environmental chemicals: effects of a formulated herbicide. Sci Rep 2018; 8:11376. [PMID: 30054531 PMCID: PMC6063884 DOI: 10.1038/s41598-018-29662-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/20/2018] [Accepted: 07/16/2018] [Indexed: 12/22/2022] Open
Abstract
The use of integrative molecular approaches can aid in a comprehensive understanding of the effects of toxicants at different levels of biological organization, also supporting risk assessment. The present study aims to unravel the toxicity mechanisms of a widely used herbicide to the arthropod Folsomia candida exposed in a natural soil, by linking effects on reproduction, proteomics and genome-wide gene expression. The EC50 effects on reproduction over 4 weeks was 4.63 mg glyphosate/kg of soil. The formulation included a polyethoxylated tallowamine as an adjuvant, which at 50% effect on reproduction had an estimated concentration of 0.87-1.49 mg/kg of soil. No effects were observed on survival and reproduction when using the isolated active substance, pointing the toxicity of the formulated product to the co-formulant instead of the active ingredient, glyphosate. RNA sequencing and shotgun proteomics were applied to assess differential transcript and protein expressions between exposed and control organisms in time, respectively. Specific functional categories at protein and transcriptome levels were concordant with each other, despite overall limited correlations between datasets. The exposure to this formulation affected normal cellular respiration and lipid metabolism, inducing oxidative stress and leading to impairment in biological life cycle mechanisms such as molting and reproduction.
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Affiliation(s)
- Tiago Simões
- MARE - Marine and Environmental Sciences Centre, ESTM, Polytechnic Institute of Leiria, Peniche, Portugal.
- Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Coimbra, Portugal.
- Institute of Ecological Sciences, Vrije University, Amsterdam, Netherlands.
| | - Sara C Novais
- MARE - Marine and Environmental Sciences Centre, ESTM, Polytechnic Institute of Leiria, Peniche, Portugal
- Institute of Ecological Sciences, Vrije University, Amsterdam, Netherlands
| | - Tiago Natal-da-Luz
- Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Coimbra, Portugal
| | - Bart Devreese
- Laboratory for Microbiology (LM-Ugent), Ghent University, Ghent, Belgium
| | - Tjalf de Boer
- Institute of Ecological Sciences, Vrije University, Amsterdam, Netherlands
| | - Dick Roelofs
- Institute of Ecological Sciences, Vrije University, Amsterdam, Netherlands
| | - José P Sousa
- Centre for Functional Ecology, Department of Life Sciences, University of Coimbra, Coimbra, Portugal
| | | | - Marco F L Lemos
- MARE - Marine and Environmental Sciences Centre, ESTM, Polytechnic Institute of Leiria, Peniche, Portugal
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Mesnage R, Antoniou MN. Ignoring Adjuvant Toxicity Falsifies the Safety Profile of Commercial Pesticides. Front Public Health 2018; 5:361. [PMID: 29404314 PMCID: PMC5786549 DOI: 10.3389/fpubh.2017.00361] [Citation(s) in RCA: 152] [Impact Index Per Article: 25.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2017] [Accepted: 12/20/2017] [Indexed: 02/03/2023] Open
Abstract
Commercial formulations of pesticides are invariably not single ingredients. Instead they are cocktails of chemicals, composed of a designated pesticidal “active principle” and “other ingredients,” with the latter collectively also known as “adjuvants.” These include surfactants, antifoaming agents, dyes, etc. Some adjuvants are added to influence the absorption and stability of the active principle and thus promote its pesticidal action. Currently, the health risk assessment of pesticides in the European Union and in the United States focuses almost exclusively on the stated active principle. Nonetheless, adjuvants can also be toxic in their own right with numerous negative health effects having been reported in humans and on the environment. Despite the known toxicity of adjuvants, they are regulated differently from active principles, with their toxic effects being generally ignored. Adjuvants are not subject to an acceptable daily intake, and they are not included in the health risk assessment of dietary exposures to pesticide residues. Here, we illustrate this gap in risk assessment by reference to glyphosate, the most used pesticide active ingredient. We also investigate the case of neonicotinoid insecticides, which are strongly suspected to be involved in bee and bumblebee colony collapse disorder. Authors of studies sometimes use the name of the active principle (for example glyphosate) when they are testing a commercial formulation containing multiple (active principle plus adjuvant) ingredients. This results in confusion in the scientific literature and within regulatory circles and leads to a misrepresentation of the safety profile of commercial pesticides. Urgent action is needed to lift the veil on the presence of adjuvants in food and human bodily fluids, as well as in the environment (such as in air, water, and soil) and to characterize their toxicological properties. This must be accompanied by regulatory precautionary measures to protect the environment and general human population from some toxic adjuvants that are currently missing from risk assessments.
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Affiliation(s)
- Robin Mesnage
- Gene Expression and Therapy Group, Department of Medical and Molecular Genetics, School of Basic & Medical Biosciences, King's College London, Guy's Hospital, London, United Kingdom
| | - Michael N Antoniou
- Gene Expression and Therapy Group, Department of Medical and Molecular Genetics, School of Basic & Medical Biosciences, King's College London, Guy's Hospital, London, United Kingdom
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17
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Chen J, Fine JD, Mullin CA. Are organosilicon surfactants safe for bees or humans? THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 612:415-421. [PMID: 28863372 DOI: 10.1016/j.scitotenv.2017.08.175] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2017] [Revised: 08/16/2017] [Accepted: 08/16/2017] [Indexed: 06/07/2023]
Abstract
Organosilicon surfactants are the most potent adjuvants available for formulating and applying agricultural pesticides and fertilizers, household cleaning and personal care products, dental impressions and medicines. Risk assessment of pesticides, drugs or personal care products that takes into account only active ingredients without the other formulation ingredients and adjuvants commonly used in their application will miss important toxicity outcomes detrimental to non-target species including pollinators and humans. Over a billion pounds of organosilicon surfactants from all uses are produced globally per year, making this a major component of the chemical landscape to which bees and humans are exposed. These silicones, like most "inerts", are generally recognized as safe, have no mandated tolerances, and their residues are largely unmonitored. Lack of their public disclosure and adequate analytical methods constrains evaluation of their risk. Organosilicon surfactants, the most super-spreading and -penetrating adjuvants available, at relevant exposure levels impair honey bee learning, are acutely toxic, and in combination with bee viruses cause synergistic mortality. Organosilicon surfactants need to be regulated as a separate class of "inerts" from the more common silicones. In turn, impacts of organosilicon surfactant exposures on humans need to be evaluated. Silicones in their great diversity probably represent the single most ubiquitous environmental class of global synthetic pollutants. Do honey bees, a model environmental indicator organism, forewarn of hidden risks to humans of ubiquitous silicone exposures?
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Affiliation(s)
- Jing Chen
- School of Chemistry and Chemical Engineering, Shandong University, Jinan, Shandong 250100, China; Suzhou Institute of Shandong University, Suzhou, Jiangsu 215123, China.
| | - Julia D Fine
- Carl R. Woese Institute for Genomic Biology, University of Illinois Urbana-Champaign, 1206 W Gregory Dr., Urbana, IL 61801, USA.
| | - Christopher A Mullin
- Department of Entomology, Center for Pollinator Research, The Pennsylvania State University, University Park, PA 16802, USA.
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18
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Defarge N, Spiroux de Vendômois J, Séralini GE. Toxicity of formulants and heavy metals in glyphosate-based herbicides and other pesticides. Toxicol Rep 2017; 5:156-163. [PMID: 29321978 PMCID: PMC5756058 DOI: 10.1016/j.toxrep.2017.12.025] [Citation(s) in RCA: 186] [Impact Index Per Article: 26.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2017] [Revised: 12/29/2017] [Accepted: 12/29/2017] [Indexed: 01/07/2023] Open
Abstract
The major pesticides of the world are glyphosate-based herbicides (GBH), and their toxicity is highly debated. To understand their mode of action, the comparative herbicidal and toxicological effects of glyphosate (G) alone and 14 of its formulations were studied in this work, as a model for pesticides. GBH are mixtures of water, with commonly 36-48% G claimed as the active principle. As with other pesticides, 10-20% of GBH consist of chemical formulants. We previously identified these by mass spectrometry and found them to be mainly families of petroleum-based oxidized molecules, such as POEA, and other contaminants. We exposed plants and human cells to the components of formulations, both mixed and separately, and measured toxicity and human cellular endocrine disruption below the direct toxicity experimentally measured threshold. G was only slightly toxic on plants at the recommended dilutions in agriculture, in contrast with the general belief. In the short term, the strong herbicidal and toxic properties of its formulations were exerted by the POEA formulant family alone. The toxic effects and endocrine disrupting properties of the formulations were mostly due to the formulants and not to G. In this work, we also identified by mass spectrometry the heavy metals arsenic, chromium, cobalt, lead and nickel, which are known to be toxic and endocrine disruptors, as contaminants in 22 pesticides, including 11 G-based ones. This could also explain some of the adverse effects of the pesticides. In in vivo chronic regulatory experiments that are used to establish the acceptable daily intakes of pesticides, G or other declared active ingredients in pesticides are assessed alone, without the formulants. Considering these new data, this assessment method appears insufficient to ensure safety. These results, taken together, shed a new light on the toxicity of these major herbicides and of pesticides in general.
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Affiliation(s)
- N Defarge
- University of Caen Normandy, Department of Biology and Network on Risks, Quality and Sustainable Environment MRSH, Esplanade de la Paix, 14032 Caen Cedex, France
| | | | - G E Séralini
- University of Caen Normandy, Department of Biology and Network on Risks, Quality and Sustainable Environment MRSH, Esplanade de la Paix, 14032 Caen Cedex, France
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19
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Tarazona JV, Court-Marques D, Tiramani M, Reich H, Pfeil R, Istace F, Crivellente F. Glyphosate toxicity and carcinogenicity: a review of the scientific basis of the European Union assessment and its differences with IARC. Arch Toxicol 2017; 91:2723-2743. [PMID: 28374158 PMCID: PMC5515989 DOI: 10.1007/s00204-017-1962-5] [Citation(s) in RCA: 192] [Impact Index Per Article: 27.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2017] [Accepted: 03/21/2017] [Indexed: 11/29/2022]
Abstract
Glyphosate is the most widely used herbicide worldwide. It is a broad spectrum herbicide and its agricultural uses increased considerably after the development of glyphosate-resistant genetically modified (GM) varieties. Since glyphosate was introduced in 1974, all regulatory assessments have established that glyphosate has low hazard potential to mammals, however, the International Agency for Research on Cancer (IARC) concluded in March 2015 that it is probably carcinogenic. The IARC conclusion was not confirmed by the EU assessment or the recent joint WHO/FAO evaluation, both using additional evidence. Glyphosate is not the first topic of disagreement between IARC and regulatory evaluations, but has received greater attention. This review presents the scientific basis of the glyphosate health assessment conducted within the European Union (EU) renewal process, and explains the differences in the carcinogenicity assessment with IARC. Use of different data sets, particularly on long-term toxicity/carcinogenicity in rodents, could partially explain the divergent views; but methodological differences in the evaluation of the available evidence have been identified. The EU assessment did not identify a carcinogenicity hazard, revised the toxicological profile proposing new toxicological reference values, and conducted a risk assessment for some representatives uses. Two complementary exposure assessments, human-biomonitoring and food-residues-monitoring, suggests that actual exposure levels are below these reference values and do not represent a public concern.
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Affiliation(s)
- Jose V Tarazona
- Pesticides Unit, European Food Safety Authority, Via Carlo Magno 1/A, 43126, Parma, Italy.
| | - Daniele Court-Marques
- Pesticides Unit, European Food Safety Authority, Via Carlo Magno 1/A, 43126, Parma, Italy
| | - Manuela Tiramani
- Pesticides Unit, European Food Safety Authority, Via Carlo Magno 1/A, 43126, Parma, Italy
| | - Hermine Reich
- Pesticides Unit, European Food Safety Authority, Via Carlo Magno 1/A, 43126, Parma, Italy
| | - Rudolf Pfeil
- Federal Institute for Risk Assessment (BfR), Berlin, Germany
| | - Frederique Istace
- Pesticides Unit, European Food Safety Authority, Via Carlo Magno 1/A, 43126, Parma, Italy
| | - Federica Crivellente
- Pesticides Unit, European Food Safety Authority, Via Carlo Magno 1/A, 43126, Parma, Italy
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20
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Adetunji C, Oloke J, Kumar A, Swaranjit S, Akpor B. Synergetic effect of rhamnolipid from Pseudomonas aeruginosa C1501 and phytotoxic metabolite from Lasiodiplodia pseudotheobromae C1136 on Amaranthus hybridus L. and Echinochloa crus-galli weeds. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:13700-13709. [PMID: 28397123 DOI: 10.1007/s11356-017-8983-8] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/07/2016] [Accepted: 04/03/2017] [Indexed: 06/07/2023]
Abstract
Rhamnolipid (Rh) is a biosurfactant produced by the bacterial Pseudomonas aeruginosa. This present study investigates rhizospheric strain C1501 of P. aeruginosa with an accession number KF976394 with the best production of rhamnolipid: a biosurfactant. The partially purified rhamnolipid from strain C1501 and Tween 80 was tested on mycelial growth of wild strain C1136. The enzyme activities involved in biodegradation, as well as necrosis induction on the tested weeds, were performed using scanning electron microscopy. It was observed that the different concentrations of rhamnolipid tested enhanced the dry mycelia weight yield of Lasiodiplodia pseudotheobromae which has been established to be producing a phytotoxic metabolite for killing weeds. It was observed that strain C1136 had a high level of cellulase and xylanase enzyme activities during this study. The scanning electron microscopy showed that the mutant strain of C1136 combined with 0.003% v/v of rhamnolipid enhances biodegradability and a high level of necrosis on the tested weeds compared with that on the untreated weeds. The highest CMCase activities and xylanase activities were obtained on the fourth day from the phytotoxic metabolite produced from the mutant strain of L. pseudotheobromae when combined with 0.003% v/v of rhamnolipid. This study has shown that rhamnolipid can serve as an adjuvant in order to enhance the penetrability of bioherbicide active ingredient for controlling weeds.
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Affiliation(s)
- Charles Adetunji
- Department of Biological Sciences, Applied Microbiology, Biotechnology and Nanotechnology Laboratory, Landmark University, P.M.B. 1001, Omu Aran, Kwara State, Nigeria.
| | - Julius Oloke
- Department of Pure and Applied Biology, Ladoke Akintola University of Technology, P.M.B 4000, Ogbomoso, Oyo State, Nigeria
| | - Anil Kumar
- Environmental Biotechnology and Microbial Biochemistry Laboratory, Institute of Microbial Technology, Sector 39A, Chandigarh, India
| | - Singh Swaranjit
- Environmental Biotechnology and Microbial Biochemistry Laboratory, Institute of Microbial Technology, Sector 39A, Chandigarh, India
| | - Benjamin Akpor
- Department of Biological Sciences, Applied Microbiology, Biotechnology and Nanotechnology Laboratory, Landmark University, P.M.B. 1001, Omu Aran, Kwara State, Nigeria
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Carles L, Joly M, Bonnemoy F, Leremboure M, Batisson I, Besse-Hoggan P. Identification of sulfonylurea biodegradation pathways enabled by a novel nicosulfuron-transforming strain Pseudomonas fluorescens SG-1: Toxicity assessment and effect of formulation. JOURNAL OF HAZARDOUS MATERIALS 2017; 324:184-193. [PMID: 28340990 DOI: 10.1016/j.jhazmat.2016.10.048] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Revised: 10/19/2016] [Accepted: 10/21/2016] [Indexed: 06/06/2023]
Abstract
Nicosulfuron is a selective herbicide belonging to the sulfonylurea family, commonly used on maize culture. A bacterial strain SG-1 was isolated from an agricultural soil previously treated with nicosulfuron. This strain was identified as Pseudomonas fluorescens and is able to quantitatively dissipate 77.5% of nicosulfuron (1mM) at 28°C in the presence of glucose within the first day of incubation. Four metabolites were identified among which ASDM (2-(aminosulfonyl)-N,N-dimethyl-3-pyridinecarboxamide) and ADMP (2-amino-4,6-dimethoxypyrimidine) in substantial proportions, corresponding to the hydrolytic sulfonylurea cleavage. Two-phase dissipation kinetics of nicosulfuron by SG-1 were observed at the highest concentrations tested (0.5 and 1mM) due to biosorption. The extend and rate of formulated nicosulfuron transformation were considerably reduced compared to those with the pure active ingredient (appearance of a lag phase, 30% dissipation after 10days of incubation instead of 100% with the pure herbicide) but the same metabolites were observed. The toxicity of metabolites (standardized Microtox® test) showed a 20-fold higher toxicity of ADMP than nicosulfuron. P. fluorescens strain SG-1 was also able to biotransform two other sulfonylureas (metsulfuron-methyl and tribenuron-methyl) with various novel pathways. These results provide new tools for a comprehensive picture of the sulfonylurea environmental fate and toxicity of nicosulfuron in the environment.
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Affiliation(s)
- Louis Carles
- Clermont Université, Université Blaise Pascal, F-63000 Clermont-Ferrand, France; CNRS, UMR 6023, Laboratoire Microorganismes: Génome et Environnement, TSA 60026, CS 60026, 63178 Aubière Cedex, France; CNRS, UMR 6296, Institut de Chimie de Clermont-Ferrand, TSA 60026, CS 60026, 63178 Aubière Cedex, France
| | - Muriel Joly
- Clermont Université, Université Blaise Pascal, F-63000 Clermont-Ferrand, France; CNRS, UMR 6023, Laboratoire Microorganismes: Génome et Environnement, TSA 60026, CS 60026, 63178 Aubière Cedex, France
| | - Frédérique Bonnemoy
- Clermont Université, Université Blaise Pascal, F-63000 Clermont-Ferrand, France; CNRS, UMR 6023, Laboratoire Microorganismes: Génome et Environnement, TSA 60026, CS 60026, 63178 Aubière Cedex, France
| | - Martin Leremboure
- Clermont Université, Université Blaise Pascal, F-63000 Clermont-Ferrand, France; CNRS, UMR 6296, Institut de Chimie de Clermont-Ferrand, TSA 60026, CS 60026, 63178 Aubière Cedex, France
| | - Isabelle Batisson
- Clermont Université, Université Blaise Pascal, F-63000 Clermont-Ferrand, France; CNRS, UMR 6023, Laboratoire Microorganismes: Génome et Environnement, TSA 60026, CS 60026, 63178 Aubière Cedex, France.
| | - Pascale Besse-Hoggan
- Clermont Université, Université Blaise Pascal, F-63000 Clermont-Ferrand, France; CNRS, UMR 6296, Institut de Chimie de Clermont-Ferrand, TSA 60026, CS 60026, 63178 Aubière Cedex, France.
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Liu H, Shao B, Long X, Yao Y, Meng Q. Foliar penetration enhanced by biosurfactant rhamnolipid. Colloids Surf B Biointerfaces 2016; 145:548-554. [PMID: 27281240 DOI: 10.1016/j.colsurfb.2016.05.058] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2015] [Revised: 04/26/2016] [Accepted: 05/19/2016] [Indexed: 11/25/2022]
Abstract
With recent environmental and health concerns, biosurfactants have obtained increasing interest in replacing conventional surfactants for diverse applications. In agriculture, the use of surfactant in stimulating foliar uptake is mainly for wetting leaf surface, resisting deposition/evaporation, enhancing penetration across cuticular membrane (CM) and translocation. This paper aimed to address the improved foliar uptake by rhamnolipid (RL) in comparison with the currently used alkyl polyglucoside (APG). As found, compared with APG at 900mg/L (1×critical micellar concentration, CMC), RL at a much lower concentration of 50mg/L (1×CMC) showed much better wettability and surface activity, indicative of its high effectiveness as surfactants. Its performance on resistance to deposition and evaporation was at least as same as APG. Moreover, RL could significantly improve the penetration of herbicide glyphosate and other two small water-soluble molecules (phenol red and Fe(2+)) across CM at an equivalent efficiency as APG at 1×CMC. Finally, the greatly enhanced herbicidal actitivity of glyphosate on greenhouse plants confirmed that RL and APG could both enhance the foliar uptake including translocation. Overall, RL should be more applicable than APG in agriculture due to its more promising properties on health/environmental friendliness.
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Affiliation(s)
- Haojing Liu
- Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou, PR China
| | - Bing Shao
- Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou, PR China
| | - Xuwei Long
- Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou, PR China
| | - Yang Yao
- Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou, PR China
| | - Qin Meng
- Department of Chemical and Biological Engineering, Zhejiang University, Hangzhou, PR China.
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Lehmann R, Hatt H, van Thriel C. Alternative in vitro assays to assess the potency of sensory irritants-Is one TRP channel enough? Neurotoxicology 2016; 60:178-186. [PMID: 27545873 DOI: 10.1016/j.neuro.2016.08.010] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2015] [Revised: 08/16/2016] [Accepted: 08/16/2016] [Indexed: 11/18/2022]
Abstract
One important function of the peripheral nervous system is the detection of noxious chemicals in the environment as well as the recognition of tissue damage throughout the body. Transient receptor potential (TRP) ion channels are able to sense a multitude of signaling factors involved in these processes. Via the sensory ganglia these sentinels convey information to the central nervous system, where perceptions of nociception or sensory irritation are generated. From the 28 members of the 6 subfamilies present in mammals, researchers in toxicology paid special attention to TRPA1 and TRPV1 channels. Various xenobiotics (e.g., acrolein, formaldehyde) can open these channels causing sensory irritations and defense mechanisms like sneezing, coughing and lacrimation. Heterologous expression of these two channels and the subsequent investigation of ion fluxes have been proposed as in vitro models for the assessment of sensory irritation. In a series of experiments using acetophenone, isophorone, and 2-ethylhexanol (2-EH) we investigated the effects of these irritants on heterologously expressed TRP channels in comparison to a primary cell culture of trigeminal ganglia neurons of mice. We confirmed acetophenone as a specific TRPA1 agonist that activates the receptor in concentrations >3mM, whereas isophorone specifically activates TRPV1 in concentrations >100μM. 2-EH can activate heterologously expressed TRPA1 concentration-dependently (1 mM-10mM). In Ca2+ imaging we observed 2-EH as an agonist of multiple channels (TRPA1, TRPV1, GPCRs) that activates the trigeminal neurons by application of μM 2-EH concentrations. The convergent results of our experiments further support the specificity of acetophenone and isophorone to activate only one of these investigated TRP channels and a more unspecific activation in the case of 2-EH. However, the results of the two different in vitro systems also showed that both TRPA1 and TRPV1 channel activation is important for the perception of irritants and only the combined and tiered testing might lead to precise estimates describing the potency of a xenobiotic to cause sensory irritation or pain.
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Affiliation(s)
- Ramona Lehmann
- IfADo-Leibniz Research Center for Working Environment and Human Factors, 44139 Dortmund, Germany.
| | - Hanns Hatt
- Department of Cell Physiology, Ruhr University Bochum, Universitätsstr. 150, D-44780 Bochum, Germany
| | - Christoph van Thriel
- IfADo-Leibniz Research Center for Working Environment and Human Factors, 44139 Dortmund, Germany
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24
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Morandi GD, Zhang K, Wiseman SB, Pereira ADS, Martin JW, Giesy JP. Effect of Lipid Partitioning on Predictions of Acute Toxicity of Oil Sands Process Affected Water to Embryos of Fathead Minnow (Pimephales promelas). ENVIRONMENTAL SCIENCE & TECHNOLOGY 2016; 50:8858-8866. [PMID: 27420640 DOI: 10.1021/acs.est.6b01481] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Dissolved organic compounds in oil sands process affected water (OSPW) are known to be responsible for most of its toxicity to aquatic organisms, but the complexity of this mixture prevents use of traditional bottom-up approaches for predicting toxicities of mixtures. Therefore, a top-down approach to predict toxicity of the dissolved organic fraction of OSPW was developed and tested. Accurate masses (i.e., m/z) determined by ultrahigh resolution mass spectrometry in negative and positive ionization modes were used to assign empirical chemical formulas to each chemical species in the mixture. For each chemical species, a predictive measure of lipid accumulation was estimated by stir-bar sorptive extraction (SBSE) to poly(dimethyl)siloxane, or by partitioning to solid-supported lipid membranes (SSLM). A narcosis mode of action was assumed and the target-lipid model was used to estimate potencies of mixtures by assuming strict additivity. A model developed using a combination of the SBSE and SSLM lipid partitioning estimates, whereby the accumulation of chemicals to neutral and polar lipids was explicitly considered, was best for predicting empirical values of LC50 in 96-h acute toxicity tests with embryos of fathead minnow (Pimephales promelas). Model predictions were within 4-fold of observed toxicity for 75% of OSPW samples, and within 8.5-fold for all samples tested, which is comparable to the range of interlaboratory variability for in vivo toxicity testing.
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Affiliation(s)
- Garrett D Morandi
- Toxicology Centre, University of Saskatchewan , Saskatoon, Saskatchewan S7N 5A2, Canada
| | - Kun Zhang
- Division of Analytical and Environmental Toxicology, University of Alberta , Edmonton, Alberta Canada
| | - Steve B Wiseman
- Toxicology Centre, University of Saskatchewan , Saskatoon, Saskatchewan S7N 5A2, Canada
| | | | - Jonathan W Martin
- Division of Analytical and Environmental Toxicology, University of Alberta , Edmonton, Alberta Canada
| | - John P Giesy
- Toxicology Centre, University of Saskatchewan , Saskatoon, Saskatchewan S7N 5A2, Canada
- Department of Veterinary Biomedical Sciences, University of Saskatchewan , Saskatoon, Saskatchewan S7N 5A2, Canada
- Department of Zoology, and Center for Integrative Toxicology, Michigan State University , East Lansing, Michigan 48823, United States
- School of Biological Sciences, University of Hong Kong , Hong Kong, SAR China
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University , Nanjing 210023, People's Republic of China
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25
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Nicolas V, Oestreicher N, Vélot C. Multiple effects of a commercial Roundup® formulation on the soil filamentous fungus Aspergillus nidulans at low doses: evidence of an unexpected impact on energetic metabolism. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2016; 23:14393-404. [PMID: 27068896 DOI: 10.1007/s11356-016-6596-2] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2015] [Accepted: 03/30/2016] [Indexed: 05/27/2023]
Abstract
Soil microorganisms are highly exposed to glyphosate-based herbicides (GBH), especially to Roundup® which is widely used worldwide. However, studies on the effects of GBH formulations on specific non-rhizosphere soil microbial species are scarce. We evaluated the toxicity of a commercial formulation of Roundup® (R450), containing 450 g/L of glyphosate (GLY), on the soil filamentous fungus Aspergillus nidulans, an experimental model microorganism. The median lethal dose (LD50) on solid media was between 90 and 112 mg/L GLY (among adjuvants, which are also included in the Roundup® formulation), which corresponds to a dilution percentage about 100 times lower than that used in agriculture. The LOAEL and NOAEL (lowest- and no-observed-adverse-effect levels) associated to morphology and growth were 33.75 and 31.5 mg/L GLY among adjuvants, respectively. The formulation R450 proved to be much more active than technical GLY. At the LD50 and lower concentrations, R450 impaired growth, cellular polarity, endocytosis, and mitochondria (average number, total volume and metabolism). In contrast with the depletion of mitochondrial activities reported in animal studies, R450 caused a stimulation of mitochondrial enzyme activities, thus revealing a different mode of action of Roundup® on energetic metabolism. These mitochondrial disruptions were also evident at a low dose corresponding to the NOAEL for macroscopic parameters, indicating that these mitochondrial biomarkers are more sensitive than those for growth and morphological ones. Altogether, our data indicate that GBH toxic effects on soil filamentous fungi, and thus potential impairment of soil ecosystems, may occur at doses far below recommended agricultural application rate.
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Affiliation(s)
- Valérie Nicolas
- UMS-IPSIT, US31 Inserm-UMS3679 CNRS, Plateforme d'Imagerie Cellulaire, Univ. Paris-Sud, Université Paris-Saclay, Faculté de Pharmacie, Tour E1, 5 Rue Jean-Baptiste Clément, 92296, Châtenay-Malabry, France
| | - Nathalie Oestreicher
- Laboratoire VEAC, Univ. Paris-Sud, Université Paris-Saclay, Faculté des Sciences, Bât. 360, Rue du Doyen André Guinier, 91405, Orsay, France
- Pôle Risques MRSH-CNRS, Université de Caen, Esplanade de la Paix, 14032, Caen, France
| | - Christian Vélot
- Laboratoire VEAC, Univ. Paris-Sud, Université Paris-Saclay, Faculté des Sciences, Bât. 360, Rue du Doyen André Guinier, 91405, Orsay, France.
- Pôle Risques MRSH-CNRS, Université de Caen, Esplanade de la Paix, 14032, Caen, France.
- CRIIGEN, 81 rue Monceau, 75008, Paris, France.
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26
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Mullin CA, Fine JD, Reynolds RD, Frazier MT. Toxicological Risks of Agrochemical Spray Adjuvants: Organosilicone Surfactants May Not Be Safe. Front Public Health 2016; 4:92. [PMID: 27242985 PMCID: PMC4862968 DOI: 10.3389/fpubh.2016.00092] [Citation(s) in RCA: 58] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/20/2015] [Accepted: 04/25/2016] [Indexed: 01/31/2023] Open
Abstract
Agrochemical risk assessment that takes into account only pesticide active ingredients without the spray adjuvants commonly used in their application will miss important toxicity outcomes detrimental to non-target species, including humans. Lack of disclosure of adjuvant and formulation ingredients coupled with a lack of adequate analytical methods constrains the assessment of total chemical load on beneficial organisms and the environment. Adjuvants generally enhance the pesticidal efficacy and inadvertently the non-target effects of the active ingredient. Spray adjuvants are largely assumed to be biologically inert and are not registered by the USA EPA, leaving their regulation and monitoring to individual states. Organosilicone surfactants are the most potent adjuvants and super-penetrants available to growers. Based on the data for agrochemical applications to almonds from California Department of Pesticide Regulation, there has been increasing use of adjuvants, particularly organosilicone surfactants, during bloom when two-thirds of USA honey bee colonies are present. Increased tank mixing of these with ergosterol biosynthesis inhibitors and other fungicides and with insect growth regulator insecticides may be associated with recent USA honey bee declines. This database archives every application of a spray tank adjuvant with detail that is unprecedented globally. Organosilicone surfactants are good stand alone pesticides, toxic to bees, and are also present in drug and personal care products, particularly shampoos, and thus represent an important component of the chemical landscape to which pollinators and humans are exposed. This mini review is the first to possibly link spray adjuvant use with declining health of honey bee populations.
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Affiliation(s)
- Christopher A. Mullin
- Department of Entomology, Center for Pollinator Research, The Pennsylvania State University, University Park, PA, USA
| | - Julia D. Fine
- Department of Entomology, Center for Pollinator Research, The Pennsylvania State University, University Park, PA, USA
| | - Ryan D. Reynolds
- Department of Entomology, Center for Pollinator Research, The Pennsylvania State University, University Park, PA, USA
| | - Maryann T. Frazier
- Department of Entomology, Center for Pollinator Research, The Pennsylvania State University, University Park, PA, USA
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27
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Defarge N, Takács E, Lozano VL, Mesnage R, Spiroux de Vendômois J, Séralini GE, Székács A. Co-Formulants in Glyphosate-Based Herbicides Disrupt Aromatase Activity in Human Cells below Toxic Levels. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2016; 13:E264. [PMID: 26927151 PMCID: PMC4808927 DOI: 10.3390/ijerph13030264] [Citation(s) in RCA: 108] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2015] [Revised: 01/19/2016] [Accepted: 02/15/2016] [Indexed: 01/16/2023]
Abstract
Pesticide formulations contain declared active ingredients and co-formulants presented as inert and confidential compounds. We tested the endocrine disruption of co-formulants in six glyphosate-based herbicides (GBH), the most used pesticides worldwide. All co-formulants and formulations were comparably cytotoxic well below the agricultural dilution of 1% (18-2000 times for co-formulants, 8-141 times for formulations), and not the declared active ingredient glyphosate (G) alone. The endocrine-disrupting effects of all these compounds were measured on aromatase activity, a key enzyme in the balance of sex hormones, below the toxicity threshold. Aromatase activity was decreased both by the co-formulants alone (polyethoxylated tallow amine-POEA and alkyl polyglucoside-APG) and by the formulations, from concentrations 800 times lower than the agricultural dilutions; while G exerted an effect only at 1/3 of the agricultural dilution. It was demonstrated for the first time that endocrine disruption by GBH could not only be due to the declared active ingredient but also to co-formulants. These results could explain numerous in vivo results with GBHs not seen with G alone; moreover, they challenge the relevance of the acceptable daily intake (ADI) value for GBHs exposures, currently calculated from toxicity tests of the declared active ingredient alone.
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Affiliation(s)
- Nicolas Defarge
- Institute of Biology, University of Caen Normandy, EA2608 and Network on Risks, Quality and Sustainable Environment MRSH, Esplanade de la Paix, CS 14032, Caen Cedex 5, France.
- CRIIGEN, 81 rue Monceau, 75008 Paris, France.
| | - Eszter Takács
- Agro-Environmental Research Institute, National Agricultural Research and Innovation Centre, H-1022, Herman Ottó u. 15, Budapest, Hungary.
| | - Verónica Laura Lozano
- Institute of Biology, University of Caen Normandy, EA2608 and Network on Risks, Quality and Sustainable Environment MRSH, Esplanade de la Paix, CS 14032, Caen Cedex 5, France.
| | - Robin Mesnage
- Institute of Biology, University of Caen Normandy, EA2608 and Network on Risks, Quality and Sustainable Environment MRSH, Esplanade de la Paix, CS 14032, Caen Cedex 5, France.
- CRIIGEN, 81 rue Monceau, 75008 Paris, France.
| | | | - Gilles-Eric Séralini
- Institute of Biology, University of Caen Normandy, EA2608 and Network on Risks, Quality and Sustainable Environment MRSH, Esplanade de la Paix, CS 14032, Caen Cedex 5, France.
- CRIIGEN, 81 rue Monceau, 75008 Paris, France.
| | - András Székács
- Agro-Environmental Research Institute, National Agricultural Research and Innovation Centre, H-1022, Herman Ottó u. 15, Budapest, Hungary.
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28
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Wang XH, Yu Y, Huang T, Qin WC, Su LM, Zhao YH. Comparison of Toxicities to Vibrio fischeri and Fish Based on Discrimination of Excess Toxicity from Baseline Level. PLoS One 2016; 11:e0150028. [PMID: 26901437 PMCID: PMC4762671 DOI: 10.1371/journal.pone.0150028] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Accepted: 02/08/2016] [Indexed: 11/19/2022] Open
Abstract
Investigations on the relationship of toxicities between species play an important role in the understanding of toxic mechanisms to environmental organisms. In this paper, the toxicity data of 949 chemicals to fish and 1470 chemicals to V. fischeri were used to investigate the modes of action (MOAs) between species. The results show that although there is a positive interspecies correlation, the relationship is poor. Analysis on the excess toxicity calculated from toxic ratios (TR) shows that many chemicals have close toxicities and share the same MOAs between the two species. Linear relationships between the toxicities and octanol/water partition coefficient (log KOW) for baseline and less inert compounds indicate that the internal critical concentrations (CBRs) approach a constant both to fish and V. fischeri for neutral hydrophobic compounds. These compounds share the same toxic mechanisms and bio-uptake processes between species. On the other hand, some hydrophilic compounds exhibit different toxic effects with greatly different log TR values between V. fischeri and fish species. These hydrophilic compounds were identified as reactive MOAs to V. fischeri, but not to fish. The interspecies correlation is improved by adding a hydrophobic descriptor into the correlation equation. This indicates that the differences in the toxic ratios between fish and V. fischeri for these hydrophilic compounds can be partly attributed to the differences of bioconcentration between the two species, rather than the differences of reactivity with the target macromolecules. These hydrophilic compounds may more easily pass through the cell membrane of V. fischeri than the gill and skin of fish, react with the target macromolecules and exhibit excess toxicity. The compounds with log KOW > 7 exhibiting very low toxicity (log TR < -1) to both species indicate that the bioconcentration potential of a chemical plays a very important role in the identification of excess toxicity and MOAs.
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Affiliation(s)
- Xiao H. Wang
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun, Jilin, P. R. China
| | - Yang Yu
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun, Jilin, P. R. China
| | - Tao Huang
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun, Jilin, P. R. China
| | - Wei C. Qin
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun, Jilin, P. R. China
| | - Li M. Su
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun, Jilin, P. R. China
| | - Yuan H. Zhao
- State Environmental Protection Key Laboratory of Wetland Ecology and Vegetation Restoration, School of Environment, Northeast Normal University, Changchun, Jilin, P. R. China
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29
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Serra AA, Couée I, Heijnen D, Michon-Coudouel S, Sulmon C, Gouesbet G. Genome-Wide Transcriptional Profiling and Metabolic Analysis Uncover Multiple Molecular Responses of the Grass Species Lolium perenne Under Low-Intensity Xenobiotic Stress. FRONTIERS IN PLANT SCIENCE 2015; 6:1124. [PMID: 26734031 PMCID: PMC4681785 DOI: 10.3389/fpls.2015.01124] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/02/2015] [Accepted: 11/27/2015] [Indexed: 05/26/2023]
Abstract
Lolium perenne, which is a major component of pastures, lawns, and grass strips, can be exposed to xenobiotic stresses due to diffuse and residual contaminations of soil. L. perenne was recently shown to undergo metabolic adjustments in response to sub-toxic levels of xenobiotics. To gain insight in such chemical stress responses, a de novo transcriptome analysis was carried out on leaves from plants subjected at the root level to low levels of xenobiotics, glyphosate, tebuconazole, and a combination of the two, leading to no adverse physiological effect. Chemical treatments influenced significantly the relative proportions of functional categories and of transcripts related to carbohydrate processes, to signaling, to protein-kinase cascades, such as Serine/Threonine-protein kinases, to transcriptional regulations, to responses to abiotic or biotic stimuli and to responses to phytohormones. Transcriptomics-based expressions of genes encoding different types of SNF1 (sucrose non-fermenting 1)-related kinases involved in sugar and stress signaling or encoding key metabolic enzymes were in line with specific qRT-PCR analysis or with the important metabolic and regulatory changes revealed by metabolomic analysis. The effects of pesticide treatments on metabolites and gene expression strongly suggest that pesticides at low levels, as single molecule or as mixture, affect cell signaling and functioning even in the absence of major physiological impact. This global analysis of L. perenne therefore highlighted the interactions between molecular regulation of responses to xenobiotics, and also carbohydrate dynamics, energy dysfunction, phytohormones and calcium signaling.
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Affiliation(s)
- Anne-Antonella Serra
- Centre National de la Recherche Scientifique, Université de Rennes 1, UMR 6553 ECOBIORennes, France
| | - Ivan Couée
- Centre National de la Recherche Scientifique, Université de Rennes 1, UMR 6553 ECOBIORennes, France
| | - David Heijnen
- Centre National de la Recherche Scientifique, Université de Rennes 1, UMR 6553 ECOBIORennes, France
| | - Sophie Michon-Coudouel
- Centre National de la Recherche Scientifique, Université de Rennes 1, UMS 3343 OSURRennes, France
| | - Cécile Sulmon
- Centre National de la Recherche Scientifique, Université de Rennes 1, UMR 6553 ECOBIORennes, France
| | - Gwenola Gouesbet
- Centre National de la Recherche Scientifique, Université de Rennes 1, UMR 6553 ECOBIORennes, France
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30
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Krivoshiev BV, Dardenne F, Blust R, Covaci A, Husson SJ. Elucidating toxicological mechanisms of current flame retardants using a bacterial gene profiling assay. Toxicol In Vitro 2015; 29:2124-32. [DOI: 10.1016/j.tiv.2015.09.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2015] [Revised: 07/31/2015] [Accepted: 09/01/2015] [Indexed: 11/24/2022]
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31
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Morandi GD, Wiseman SB, Pereira A, Mankidy R, Gault IGM, Martin JW, Giesy JP. Effects-Directed Analysis of Dissolved Organic Compounds in Oil Sands Process-Affected Water. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2015; 49:12395-12404. [PMID: 26381019 DOI: 10.1021/acs.est.5b02586] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Acute toxicity of oil sands process-affected water (OSPW) is caused by its complex mixture of bitumen-derived organics, but the specific chemical classes that are most toxic have not been demonstrated. Here, effects-directed analysis was used to determine the most acutely toxic chemical classes in OSPW collected from the world's first oil sands end-pit lake. Three sequential rounds of fractionation, chemical analysis (ultrahigh resolution mass spectrometry), and acute toxicity testing (96 h fathead minnow embryo lethality and 15 min Microtox bioassay) were conducted. Following primary fractionation, toxicity was primarily attributable to the neutral extractable fraction (F1-NE), containing 27% of original organics mass. In secondary fractionation, F1-NE was subfractionated by alkaline water washing, and toxicity was primarily isolated to the ionizable fraction (F2-NE2), containing 18.5% of the original organic mass. In the final round, chromatographic subfractionation of F2-NE2 resulted in two toxic fractions, with the most potent (F3-NE2a, 11% of original organic mass) containing predominantly naphthenic acids (O2(-)). The less-toxic fraction (F3-NE2b, 8% of original organic mass) contained predominantly nonacid species (O(+), O2(+), SO(+), NO(+)). Evidence supports naphthenic acids as among the most acutely toxic chemical classes in OSPW, but nonacidic species also contribute to acute toxicity of OSPW.
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Affiliation(s)
- Garrett D Morandi
- Toxicology Centre, University of Saskatchewan , Saskatoon, Saskatchewan S7N 5B3, Canada
| | - Steve B Wiseman
- Toxicology Centre, University of Saskatchewan , Saskatoon, Saskatchewan S7N 5B3, Canada
| | - Alberto Pereira
- Division of Analytical and Environmental Toxicology, University of Alberta , Edmonton, Alberta T6G 2G3, Canada
| | - Rishikesh Mankidy
- Toxicology Centre, University of Saskatchewan , Saskatoon, Saskatchewan S7N 5B3, Canada
| | - Ian G M Gault
- Division of Analytical and Environmental Toxicology, University of Alberta , Edmonton, Alberta T6G 2G3, Canada
| | - Jonathan W Martin
- Division of Analytical and Environmental Toxicology, University of Alberta , Edmonton, Alberta T6G 2G3, Canada
| | - John P Giesy
- Toxicology Centre, University of Saskatchewan , Saskatoon, Saskatchewan S7N 5B3, Canada
- Department of Veterinary Biomedical Sciences, University of Saskatchewan , Saskatoon, Saskatchewan S7N 5B4, Canada
- Department of Zoology, and Center for Integrative Toxicology, Michigan State University , East Lansing, Michigan 48824, United States
- Department of Biology & Chemistry and State Key Laboratory for Marine Pollution, City University of Hong Kong , Kowloon, Hong Kong Special Administrative Region (SAR), People's Republic of China
- School of Biological Sciences, The University of Hong Kong , Hong Kong SAR, People's Republic of China
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University , Nanjing 210023, People's Republic of China
- Department of Biology, Hong Kong Baptist University , Hong Kong SAR, People's Republic of China
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32
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Mullin CA, Chen J, Fine JD, Frazier MT, Frazier JL. The formulation makes the honey bee poison. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2015; 120:27-35. [PMID: 25987217 DOI: 10.1016/j.pestbp.2014.12.026] [Citation(s) in RCA: 93] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/30/2014] [Revised: 12/22/2014] [Accepted: 12/26/2014] [Indexed: 05/14/2023]
Abstract
Dr. Fumio Matsumura's legacy embraced a passion for exploring environmental impacts of agrochemicals on non-target species such as bees. Why most formulations are more toxic to bees than respective active ingredients and how pesticides interact to cause pollinator decline cannot be answered without understanding the prevailing environmental chemical background to which bees are exposed. Modern pesticide formulations and seed treatments, particularly when multiple active ingredients are blended, require proprietary adjuvants and inert ingredients to achieve high efficacy for targeted pests. Although we have found over 130 different pesticides and metabolites in beehive samples, no individual pesticide or amount correlates with recent bee declines. Recently we have shown that honey bees are sensitive to organosilicone surfactants, nonylphenol polyethoxylates and the solvent N-methyl-2-pyrrolidone (NMP), widespread co-formulants used in agrochemicals and frequent pollutants within the beehive. Effects include learning impairment for adult bees and chronic toxicity in larval feeding bioassays. Multi-billion pounds of formulation ingredients like NMP are used and released into US environments. These synthetic organic chemicals are generally recognized as safe, have no mandated tolerances, and residues remain largely unmonitored. In contrast to finding about 70% of the pesticide active ingredients searched for in our pesticide analysis of beehive samples, we have found 100% of the other formulation ingredients targeted for analysis. These 'inerts' overwhelm the chemical burden from active pesticide, drug and personal care ingredients with which they are formulated. Honey bees serve as an optimal terrestrial bioindicator to determine if 'the formulation and not just the dose makes the poison'.
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Affiliation(s)
- Christopher A Mullin
- Department of Entomology, Center for Pollinator Research, The Pennsylvania State University, University Park, PA 16802, USA.
| | - Jing Chen
- Department of Entomology, Center for Pollinator Research, The Pennsylvania State University, University Park, PA 16802, USA
| | - Julia D Fine
- Department of Entomology, Center for Pollinator Research, The Pennsylvania State University, University Park, PA 16802, USA
| | - Maryann T Frazier
- Department of Entomology, Center for Pollinator Research, The Pennsylvania State University, University Park, PA 16802, USA
| | - James L Frazier
- Department of Entomology, Center for Pollinator Research, The Pennsylvania State University, University Park, PA 16802, USA
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Moreira RA, da Silva Mansano A, Rocha O. The toxicity of carbofuran to the freshwater rotifer, Philodina roseola. ECOTOXICOLOGY (LONDON, ENGLAND) 2015; 24:604-615. [PMID: 25588673 DOI: 10.1007/s10646-014-1408-2] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Accepted: 12/27/2014] [Indexed: 06/04/2023]
Abstract
In this study, the effects of exposing the rotifer Philodina roseola to the pesticide carbofuran were investigated. Its range of sensitivity to potassium dichromate, the acute toxicity of active ingredient carbofuran and of carbofuran dosed as its commercial form, Furadan(®) 350 SC were determined. Chronic toxicity of carbofuran dosed as Furadan(®) 350 SC on P. roseola survival and fecundity were also studied. The sensitivity of P. roseola to K2Cr2O7 ranged from 29.52 to 64.67 mg L(-1), averaging 47.10 mg L(-1). The 48-h EC50 were 13.36 ± 2.63 mg L(-1) for carbofuran and 89.32 ± 6.52 mg L(-1) for commercial form. Chronic toxicity tests showed that the survival of this rotifer was not affected by the carbofuran dosed as Furadan(®) 350 SC at the concentrations tested and that at 1.56 and 3.12 mg L(-1) their fecundity was higher than in the absence of this commercial product, characterizing the hormesis phenomenon. The sensitivity profile of several species to carbofuran indicated that P. roseola is more susceptible to this pesticide than the fish Clarias batrachus, the bacterium Vibrio fischeri, the protozoan Paramecium caudatum and the rotifer Brachionus calyciflorus, although the acute toxicity of carbofuran dosed as Furadan(®) 350 SC to P. roseola is much lower than that of active ingredient carbofuran. The results also imply that the exacerbated use of pesticides and the constant, accelerated expansion of agricultural activity will make aquatic non-target species even more vulnerable. Furthermore, the relevant role of benthic organisms in aquatic environments justifies the inclusion of P. roseola and other benthic species in toxicity screening for risk assessment, regarding this environmental compartment.
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Affiliation(s)
- Raquel Aparecida Moreira
- Post-Graduate Program of Ecology and Natural Resources, Federal University of São Carlos, Rodovia Washington Luis, km 235, São Carlos, SP, CEP 13565-905, Brazil,
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Coalova I, Ríos de Molina MDC, Chaufan G. Influence of the spray adjuvant on the toxicity effects of a glyphosate formulation. Toxicol In Vitro 2014; 28:1306-11. [PMID: 24999230 DOI: 10.1016/j.tiv.2014.06.014] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2014] [Revised: 06/19/2014] [Accepted: 06/25/2014] [Indexed: 10/25/2022]
Abstract
In the present study, the influence of the spray adjuvant on the toxicity effects of a glyphosate formulation was examined in HEp-2 cell line. We determined the median lethal concentration (LC50) of Atanor® (glyphosate formulation), Impacto® (spray adjuvant) and the mixture of both agrochemicals. We also compared the toxicities of the pesticides individually and in mixture and we analyzed the effects on oxidative balance from each treatment. Our results showed that all the agrochemicals assayed induce dose and time-dependent cytotoxicity and that the toxicity of Impacto® with Atanor® (mixture) was additive on HEp-2 cell line. All the agrochemicals assayed produced an increase in catalase activity and glutathione levels, while no effects were observed for superoxide dismutase and glutathione-S-transferase activities. We found an important increase in ROS production in cells treated with Atanor® and mixture. Besides, all the agrochemicals used triggered caspase 3/7 activation and hence induced apoptosis pathway in this cell line. In conclusion, our results demonstrated that the addition of adjuvant to glyphosate formulation increase the toxicity of the mixture in cell culture. Furthermore, cell culture exposed to agrochemical mixture showed an increased ROS production and antioxidant defenses.
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Affiliation(s)
- Isis Coalova
- Departamento de Química Biológica, IQUIBICEN - CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, Argentina
| | - María Del Carmen Ríos de Molina
- Departamento de Química Biológica, IQUIBICEN - CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, Argentina
| | - Gabriela Chaufan
- Departamento de Química Biológica, IQUIBICEN - CONICET, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires, Argentina.
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Álvarez-Muñoz D, Al-Salhi R, Abdul-Sada A, González-Mazo E, Hill EM. Global metabolite profiling reveals transformation pathways and novel metabolomic responses in Solea senegalensis after exposure to a non-ionic surfactant. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2014; 48:5203-5210. [PMID: 24684439 DOI: 10.1021/es501276g] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/03/2023]
Abstract
Alcohol polyethoxylate (AEO) surfactants are widely used in household and industrial products, but the health effects arising from short-term exposure to sublethal concentrations are unknown. A metabolomic approach was used to investigate the biotransformation and effects of exposure to sublethal concentrations of hexaethylene glycol monododecylether (C12EO6) in juvenile sole, Solea senegalensis. After 5 days, C12EO6 was rapidly metabolized in the sole by oxidation, glucuronidation, and ethoxylate chain shortening. C12EO6 exposure at either 146 or 553 μg L(-1) resulted in significant metabolite disruption in liver and blood samples, including an apparent fold increase of >10(6) in the circulating levels of C24 bile acids and C27 bile alcohols, disturbance of glucocorticoid and lipid metabolism, and a 470-fold decrease in levels of the fatty acid transport molecule palmitoyl carnitine. Depuration resulted in rapid elimination of the surfactant and normalization of metabolites toward pre-exposure levels. Our findings show for the first time the ability of metabolomic analyses to discern effects of this AEO on metabolite homeostasis at exposure levels below its no effect concentrations for survival and reproduction in juvenile fish. The pronounced alteration in levels of liver metabolites, phospholipids, and glucocorticoids in S. senegalensis in response to surfactant exposure may indicate that this contaminant could potentially impact a number of health end points in fish.
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Affiliation(s)
- Diana Álvarez-Muñoz
- School of Life Sciences, University of Sussex , Brighton BN1 9QJ, United Kingdom
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Mesnage R, Bernay B, Séralini GE. Ethoxylated adjuvants of glyphosate-based herbicides are active principles of human cell toxicity. Toxicology 2013; 313:122-8. [PMID: 23000283 DOI: 10.1016/j.tox.2012.09.006] [Citation(s) in RCA: 233] [Impact Index Per Article: 21.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2012] [Revised: 08/30/2012] [Accepted: 09/10/2012] [Indexed: 12/14/2022]
Abstract
Pesticides are always used in formulations as mixtures of an active principle with adjuvants. Glyphosate, the active ingredient of the major pesticide in the world, is an herbicide supposed to be specific on plant metabolism. Its adjuvants are generally considered as inert diluents. Since side effects for all these compounds have been claimed, we studied potential active principles for toxicity on human cells for 9 glyphosate-based formulations. For this we detailed their compositions and toxicities, and as controls we used a major adjuvant (the polyethoxylated tallowamine POE-15), glyphosate alone, and a total formulation without glyphosate. This was performed after 24h exposures on hepatic (HepG2), embryonic (HEK293) and placental (JEG3) cell lines. We measured mitochondrial activities, membrane degradations, and caspases 3/7 activities. The compositions in adjuvants were analyzed by mass spectrometry. Here we demonstrate that all formulations are more toxic than glyphosate, and we separated experimentally three groups of formulations differentially toxic according to their concentrations in ethoxylated adjuvants. Among them, POE-15 clearly appears to be the most toxic principle against human cells, even if others are not excluded. It begins to be active with negative dose-dependent effects on cellular respiration and membrane integrity between 1 and 3ppm, at environmental/occupational doses. We demonstrate in addition that POE-15 induces necrosis when its first micellization process occurs, by contrast to glyphosate which is known to promote endocrine disrupting effects after entering cells. Altogether, these results challenge the establishment of guidance values such as the acceptable daily intake of glyphosate, when these are mostly based on a long term in vivo test of glyphosate alone. Since pesticides are always used with adjuvants that could change their toxicity, the necessity to assess their whole formulations as mixtures becomes obvious. This challenges the concept of active principle of pesticides for non-target species.
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Affiliation(s)
- R Mesnage
- University of Caen, EA2608, Institute of Biology, Risk Pole CNRS, Esplanade de la Paix, 14032 Caen, Cedex, France; CRIIGEN, 40 rue de Monceau, 75008 Paris, France
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Holečková B, Šiviková K, Dianovský J, Galdíková M. Effect of triazole pesticide formulation on bovine culture cells. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART. B, PESTICIDES, FOOD CONTAMINANTS, AND AGRICULTURAL WASTES 2013; 48:1080-1088. [PMID: 24007485 DOI: 10.1080/03601234.2013.824224] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
To date, most data about the possible genotoxic effect of triazole pesticides are focused on laboratory animals resulting in limited information on further non-target organisms such as cattle. The objective of the present study was to investigate the effect of triazole (tebuconazole/prothioconazole) fungicide formulation on the induction of chromosomal aberrations (CAs), sister chromatid exchanges (SCEs) and DNA fragmentation in bovine cultured lymphocytes. Our results showed that the fungicide formulation did not induce significant number of CAs in bovine cells after 24 h treatment. Nevertheless, the dose-dependent reduction of mitotic division was observed, with the strongest effect at 30.0 μg mL(-1) in both donors (P < 0.01 and P < 0.001, respectively). Prolonged 48 h exposure caused the increased level of breaks in treated cultures (3.0-15.0 μg mL(-1); P < 0.05) and significant decrease in mitotic index (MI). The tested fungicide failed to produce any statistical changes in the SCE frequency neither after 24 h nor 48 h treatment. However, the significant decline of the proliferation index (PI) was observed after 24 h indicating the fungicide influence on cell cycle kinetics. Prolonged 48 h exposure caused cytotoxicity reflecting in lower PI value relative to control mainly at the highest fungicide concentrations (30.0 μg mL(-1), P < 0.001). Using painting probes for bovine chromosomes 1, 5 and 7 (BTA1, BTA5 and BTA7) only low levels of aneuploidies were detected. Significant increase of polyploidy cells (P < 0.05) was induced by a 3.0 μg mL(-1) dose of the fungicide after 48 h. DNA fragmentation assay didn't reveal the presence of DNA nucleosome ladder in cell cultures at any time (24 h and 48 h) and fungicide concentration.
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Affiliation(s)
- Beáta Holečková
- Department of Biology and Genetics, University of Veterinary Medicine and Pharmacy, Košice, Slovak Republic.
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Wustenberghs H, Delcour I, D'Haene K, Lauwers L, Marchand F, Steurbaut W, Spanoghe P. A dual indicator set to help farms achieve more sustainable crop protection. PEST MANAGEMENT SCIENCE 2012; 68:1130-1140. [PMID: 22689544 DOI: 10.1002/ps.3332] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/10/2011] [Revised: 02/10/2012] [Accepted: 03/30/2012] [Indexed: 06/01/2023]
Abstract
BACKGROUND Farmers are being called to use plant protection products (PPPs) more consciously and adopt more sustainable crop protection strategies. Indicators will help farmers to monitor their progress towards sustainability and will support their learning process. Talking the indicators through in farmers' discussion groups and the resulting peer encouragement will foster knowledge acquirement and can lead to changes in attitudes, norms, perception and behaviour. RESULTS Using a participatory approach, a conceptual framework for on-farm sustainable crop protection practices was created. The same participatory approach was used to design a dual indicator set, which pairs a pesticide impact assessment system (PIAS) with a farm inquiry. The PIAS measures the risk for human health and the environment exerted by chemical crop protection. The inquiry reveals the farmers' response to this risk, both in terms of the actions they take and their knowledge, awareness and attitude. CONCLUSIONS The dual indicator set allows for implementation in four tiers, each representing increased potential for monitoring and social learning. The indicator set can be adjusted on the basis of new findings, and the participatory approach can be extrapolated to other situations.
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Affiliation(s)
- Hilde Wustenberghs
- Social Sciences Unit, Institute for Agriculture and Fisheries Research, Merelbeke, Belgium.
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Ramel F, Sulmon C, Serra AA, Gouesbet G, Couée I. Xenobiotic sensing and signalling in higher plants. JOURNAL OF EXPERIMENTAL BOTANY 2012; 63:3999-4014. [PMID: 22493519 DOI: 10.1093/jxb/ers102] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/20/2023]
Abstract
Anthropogenic changes and chemical pollution confront plant communities with various xenobiotic compounds or combinations of xenobiotics, involving chemical structures that are at least partially novel for plant species. Plant responses to chemical challenges and stimuli are usually characterized by the approaches of toxicology, ecotoxicology, and stress physiology. Development of transcriptomics and proteomics analysis has demonstrated the importance of modifications to gene expression in plant responses to xenobiotics. It has emerged that xenobiotic effects could involve not only biochemical and physiological disruption, but also the disruption of signalling pathways. Moreover, mutations affecting sensing and signalling pathways result in modifications of responses to xenobiotics, thus confirming interference or crosstalk between xenobiotic effects and signalling pathways. Some of these changes at gene expression, regulation and signalling levels suggest various mechanisms of xenobiotic sensing in higher plants, in accordance with xenobiotic-sensing mechanisms that have been characterized in other phyla (yeast, invertebrates, vertebrates). In higher plants, such sensing systems are difficult to identify, even though different lines of evidence, involving mutant studies, transcription factor analysis, or comparative studies, point to their existence. It remains difficult to distinguish between the hypothesis of direct xenobiotic sensing and indirect sensing of xenobiotic-related modifications. However, future characterization of xenobiotic sensing and signalling in higher plants is likely to be a key element for determining the tolerance and remediation capacities of plant species. This characterization will also be of interest for understanding evolutionary dynamics of stress adaptation and mechanisms of adaptation to novel stressors.
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Affiliation(s)
- Fanny Ramel
- Université de Rennes 1, Centre National de la Recherche Scientifique, UMR 6553 ECOBIO, Campus de Beaulieu, bâtiment 14A, F-35042 Rennes Cedex, France
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