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Izumi Y, O’Dell KA, Zorumski CF. Glyphosate as a direct or indirect activator of pro-inflammatory signaling and cognitive impairment. Neural Regen Res 2024; 19:2212-2218. [PMID: 38488555 PMCID: PMC11034589 DOI: 10.4103/1673-5374.391331] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Revised: 10/28/2023] [Accepted: 11/16/2023] [Indexed: 04/24/2024] Open
Abstract
Glyphosate-based herbicides are widely used around the world, making it likely that most humans have significant exposure. Because of habitual exposure, there are concerns about toxicity including neurotoxicity that could result in neurological, psychiatric, or cognitive impairment. We recently found that a single injection of glyphosate inhibits long-term potentiation, a cellular model of learning and memory, in rat hippocampal slices dissected 1 day after injection, indicating that glyphosate-based herbicides can alter cognitive function. Glyphosate-based herbicides could adversely affect cognitive function either indirectly and/or directly. Indirectly, glyphosate could affect gut microbiota, and if dysbiosis results in endotoxemia (leaky gut), infiltrated bacterial by-products such as lipopolysaccharides could activate pro-inflammatory cascades. Glyphosate can also directly trigger pro-inflammatory cascades. Indeed, we observed that acute glyphosate exposure inhibits long-term potentiation in rat hippocampal slices. Interestingly, direct inhibition of long-term potentiation by glyphosate appears to be similar to that of lipopolysaccharides. There are several possible measures to control dysbiosis and neuroinflammation caused by glyphosate. Dietary intake of polyphenols, such as quercetin, which overcome the inhibitory effect of glyphosate on long-term potentiation, could be one effective strategy. The aim of this narrative review is to discuss possible mechanisms underlying neurotoxicity following glyphosate exposure as a means to identify potential treatments.
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Affiliation(s)
- Yukitoshi Izumi
- Department of Psychiatry, Washington University School of Medicine, St. Louis, MO, USA
- Taylor Family Institute for Innovative Psychiatric Research, Washington University School of Medicine, St. Louis, MO, USA
| | - Kazuko A. O’Dell
- Department of Psychiatry, Washington University School of Medicine, St. Louis, MO, USA
- Taylor Family Institute for Innovative Psychiatric Research, Washington University School of Medicine, St. Louis, MO, USA
| | - Charles F. Zorumski
- Department of Psychiatry, Washington University School of Medicine, St. Louis, MO, USA
- Taylor Family Institute for Innovative Psychiatric Research, Washington University School of Medicine, St. Louis, MO, USA
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2
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Jauregui-Zunzunegui S, Rodríguez-Artalejo F, Tellez-Plaza M, García-Esquinas E. Glyphosate exposure, muscular health and functional limitations in middle-aged and older adults. ENVIRONMENTAL RESEARCH 2024; 251:118547. [PMID: 38452917 DOI: 10.1016/j.envres.2024.118547] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/02/2024] [Revised: 02/19/2024] [Accepted: 02/22/2024] [Indexed: 03/09/2024]
Abstract
BACKGROUND Glyphosate is the most widely used herbicide worldwide, both in domestic and industrial settings. Experimental research in animal models has demonstrated changes in muscle physiology and reduced contractile strength associated with glyphosate exposure, while epidemiological studies have shown associations between glyphosate exposure and adverse health outcomes in critical biological systems affecting muscle function. METHODS This study used data from a nationally representative survey of the non-institutionalized U.S. general population (NHANES, n = 2132). Urine glyphosate concentrations were determined by ion chromatography with tandem mass spectrometry. Hand grip strength (HGS) was measured using a Takei Dynamometer, and relative strength estimated as the ratio between HGS in the dominant hand and the appendicular lean mass (ALM) to body mass index (ALMBMI) ratio. Low HGS and low relative HGS were defined as 1 sex-, age- and race-specific SD below the mean. Physical function limitations were identified as significant difficulty or incapacity in various activities. RESULTS In fully-adjusted models, the Mean Differences (MD) and 95% confidence intervals [95%CI] per doubling increase in glyphosate concentrations were -0.55 [-1.09, -0.01] kg for HGS in the dominant hand, and -0.90 [-1.58. -0.21] kg for HGS/ALMBMI. The Odds Ratios (OR) [95% CI] for low HGS, low relative HGS and functional limitations by glyphosate concentrations were 1.27 [1.03, 1.57] for low HGS; 1.43 [1.05; 1.94] for low relative HGS; 1.33 [1.08, 1.63] for stooping, crouching or kneeling difficulty; 1.17 [0.91, 1.50] for lifting or carrying items weighting up to 10 pounds difficulty; 1.21 [1.01, 1.40] for standing up from armless chair difficulty; and 1.47 [1.05, 2.29] for ascending ten steps without pause difficulty. CONCLUSIONS Glyphosate exposure may be a risk factor for decreased grip strength and increased physical functional limitations. More studies investigating the influence of this and other environmental pollutants on functional aging are needed.
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Affiliation(s)
- Sara Jauregui-Zunzunegui
- Department of Preventive Medicine and Public Health, Hospital Universitario Nuestra Señora de Candelaria, Spain.
| | - Fernando Rodríguez-Artalejo
- Department of Preventive Medicine and Public Health, Universidad Autónoma de Madrid, Madrid, Spain; CIBERESP (CIBER of Epidemiology and Public Health), Madrid, Spain; IMDEA-Food, CEI UAM+CSIC, Madrid, Spain.
| | - María Tellez-Plaza
- Department of Preventive Medicine and Public Health, Universidad Autónoma de Madrid, Madrid, Spain; Department of Chronic Diseases Epidemiology, National Center of Epidemiology, Carlos III Health Institute, Madrid, Spain.
| | - Esther García-Esquinas
- CIBERESP (CIBER of Epidemiology and Public Health), Madrid, Spain; Department of Chronic Diseases Epidemiology, National Center of Epidemiology, Carlos III Health Institute, Madrid, Spain.
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Costas-Ferreira C, Durán R, Faro LF. Neurotoxic effects of exposure to glyphosate in rat striatum: Effects and mechanisms of action on dopaminergic neurotransmission. PESTICIDE BIOCHEMISTRY AND PHYSIOLOGY 2023; 193:105433. [PMID: 37248010 DOI: 10.1016/j.pestbp.2023.105433] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/29/2023] [Revised: 04/09/2023] [Accepted: 04/19/2023] [Indexed: 05/31/2023]
Abstract
The main objective of this study was to evaluate the effects and possible mechanisms of action of glyphosate and a glyphosate-based herbicide (GBH) on dopaminergic neurotransmission in the rat striatum. Acute exposure to glyphosate or GBH, administered by systemic (75 or 150 mg/kg, i.p.) or intrastriatal (1, 5, or 10 mM for 1 h) routes, produced significant concentration-dependent increases in dopamine release measured in vivo by cerebral microdialysis coupled to HPLC with electrochemical detection. Systemic administration of glyphosate also significantly impaired motor control and decreased striatal acetylcholinesterase activity and antioxidant capacity. At least two mechanisms can be proposed to explain the glyphosate-induced increases in extracellular dopamine levels: increased exocytotic dopamine release from synaptic vesicles or inhibition of dopamine transporter (DAT). Thus, we investigated the effects of intrastriatal administration of glyphosate (5 mM) in animals pretreated with tetrodotoxin (TTX) or reserpine. It was observed that TTX (10 or 20 μM) had no significant effect on glyphosate-induced dopamine release, while reserpine (10 mg/kg i.p) partially but significantly reduced the dopamine release. When glyphosate was coinfused with nomifensine (50 μM), the increase in dopamine levels was significantly higher than that observed with glyphosate or nomifensine alone. So, two possible hypotheses could explain this additive effect: both glyphosate and nomifensine act through different mechanisms at the dopaminergic terminals to increase dopamine levels; or both nomifensine and glyphosate act on DAT, with glyphosate simultaneously inhibiting reuptake and stimulating dopamine release by reversing the DAT function. Future research is needed to determine the effects of this pesticide at environmentally relevant doses.
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Affiliation(s)
- Carmen Costas-Ferreira
- Department of Functional Biology and Health Sciences, Faculty of Biology, University of Vigo, Vigo, Spain
| | - Rafael Durán
- Department of Functional Biology and Health Sciences, Faculty of Biology, University of Vigo, Vigo, Spain
| | - Lilian Ferreira Faro
- Department of Functional Biology and Health Sciences, Faculty of Biology, University of Vigo, Vigo, Spain.
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Cresto N, Forner-Piquer I, Baig A, Chatterjee M, Perroy J, Goracci J, Marchi N. Pesticides at brain borders: Impact on the blood-brain barrier, neuroinflammation, and neurological risk trajectories. CHEMOSPHERE 2023; 324:138251. [PMID: 36878369 DOI: 10.1016/j.chemosphere.2023.138251] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Revised: 02/11/2023] [Accepted: 02/24/2023] [Indexed: 06/18/2023]
Abstract
Pesticides are omnipresent, and they pose significant environmental and health risks. Translational studies indicate that acute exposure to high pesticide levels is detrimental, and prolonged contact with low concentrations of pesticides, as single and cocktail, could represent a risk factor for multi-organ pathophysiology, including the brain. Within this research template, we focus on pesticides' impact on the blood-brain barrier (BBB) and neuroinflammation, physical and immunological borders for the homeostatic control of the central nervous system (CNS) neuronal networks. We examine the evidence supporting a link between pre- and postnatal pesticide exposure, neuroinflammatory responses, and time-depend vulnerability footprints in the brain. Because of the pathological influence of BBB damage and inflammation on neuronal transmission from early development, varying exposures to pesticides could represent a danger, perhaps accelerating adverse neurological trajectories during aging. Refining our understanding of how pesticides influence brain barriers and borders could enable the implementation of pesticide-specific regulatory measures directly relevant to environmental neuroethics, the exposome, and one-health frameworks.
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Affiliation(s)
- Noemie Cresto
- Institute of Functional Genomics, University of Montpellier, CNRS, INSERM, Montpellier, France
| | - Isabel Forner-Piquer
- Centre for Pollution Research and Policy, Department of Life Sciences, College of Health, Medicine and Life Sciences, Brunel University London, Kingston Lane, Uxbridge, UB8 3PH, United Kingdom.
| | - Asma Baig
- Centre for Pollution Research and Policy, Department of Life Sciences, College of Health, Medicine and Life Sciences, Brunel University London, Kingston Lane, Uxbridge, UB8 3PH, United Kingdom
| | - Mousumi Chatterjee
- Centre for Pollution Research and Policy, Department of Life Sciences, College of Health, Medicine and Life Sciences, Brunel University London, Kingston Lane, Uxbridge, UB8 3PH, United Kingdom
| | - Julie Perroy
- Institute of Functional Genomics, University of Montpellier, CNRS, INSERM, Montpellier, France
| | | | - Nicola Marchi
- Institute of Functional Genomics, University of Montpellier, CNRS, INSERM, Montpellier, France.
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5
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Cullen MG, Bliss L, Stanley DA, Carolan JC. Investigating the effects of glyphosate on the bumblebee proteome and microbiota. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 864:161074. [PMID: 36566850 DOI: 10.1016/j.scitotenv.2022.161074] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2022] [Revised: 12/15/2022] [Accepted: 12/16/2022] [Indexed: 06/17/2023]
Abstract
Glyphosate is one of the most widely used herbicides globally. It acts by inhibiting an enzyme in an aromatic amino acid synthesis pathway specific to plants and microbes, leading to the view that it poses no risk to other organisms. However, there is growing concern that glyphosate is associated with health effects in humans and an ever-increasing body of evidence that suggests potential deleterious effects on other animals including pollinating insects such as bees. Although pesticides have long been considered a factor in the decline of wild bee populations, most research on bees has focussed on demonstrating and understanding the effects of insecticides. To assess whether glyphosate poses a risk to bees, we characterised changes in survival, behaviour, sucrose solution consumption, the digestive tract proteome, and the microbiota in the bumblebee Bombus terrestris after chronic exposure to field relevant doses of technical grade glyphosate or the glyphosate-based formulation, RoundUp Optima+®. Regardless of source, there were changes in response to glyphosate exposure in important cellular and physiological processes in the digestive tract of B. terrestris, with proteins associated with oxidative stress regulation, metabolism, cellular adhesion, the extracellular matrix, and various signalling pathways altered. Interestingly, proteins associated with endocytosis, oxidative phosphorylation, the TCA cycle, and carbohydrate, lipid, and amino acid metabolism were differentially altered depending on whether the exposure source was glyphosate alone or RoundUp Optima+®. In addition, there were alterations to the digestive tract microbiota of bees depending on the glyphosate source No impacts on survival, behaviour, or food consumption were observed. Our research provides insights into the potential mode of action and consequences of glyphosate exposure at the molecular, cellular and organismal level in bumblebees and highlights issues with the current honeybee-centric risk assessment of pesticides and their formulations, where the impact of co-formulants on non-target organisms are generally overlooked.
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Affiliation(s)
- Merissa G Cullen
- Department of Biology, Maynooth University, Maynooth, Co. Kildare, Ireland.
| | - Liam Bliss
- Department of Biology, Maynooth University, Maynooth, Co. Kildare, Ireland
| | - Dara A Stanley
- School of Agriculture and Food Science, University College Dublin, Belfield, Dublin 2, Ireland; Earth Institute, University College Dublin, Belfield, Dublin 2, Ireland
| | - James C Carolan
- Department of Biology, Maynooth University, Maynooth, Co. Kildare, Ireland
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Bai G, Zhou R, Jiang X, Zou Y, Shi B. Glyphosate-based herbicides induces autophagy in IPEC-J2 cells and the intervention of N-acetylcysteine. ENVIRONMENTAL TOXICOLOGY 2022; 37:1878-1890. [PMID: 35388968 DOI: 10.1002/tox.23534] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2022] [Revised: 03/29/2022] [Accepted: 03/30/2022] [Indexed: 06/14/2023]
Abstract
Glyphosate-based herbicides (GBHs) are the most widely used pesticide in the world, and its extensive use has increased pressures on environmental safety and potential human and livestock health risks. This study investigated the effects of GBHs on antioxidant capacity, inflammatory cytokines, and autophagy of porcine intestinal epithelial cells (IPEC-J2) and its molecular mechanism. Also, the protective effects of N-acetylcysteine (NAC) against the toxicity of GBHs were evaluated. Our results showed that the activities of antioxidant enzymes (SOD, GSH-Px) were decreased by GBHs. GBHs increased inflammatory factors (IL-1β, IL-6, TNF-α) and the mRNA expression of iNOS and COX-2. GBHs induced the up-regulation of Nrf2/HO-1 pathway and the phosphorylation of IκB-α and NFκB p65, up-regulation of LC3-II/LC3-I, and down-regulation of P62, and NFκB inhibitor decreased the mRNA expression of inflammatory cytokines (IL-1β, IL-6, IL-8). Moreover, NAC reduced the cytotoxicity by suppressing ROS levels, and changed the autophagy-related proteins such as the suppression of LC3-II conversion and up-regulation of P62. Our findings unveil a novel mechanism of GBHs effects on IPEC-J2 cells and NAC can reverse cytotoxicity to some extent.
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Affiliation(s)
- Guangdong Bai
- Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Ruiying Zhou
- Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Xu Jiang
- Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Yingbin Zou
- Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
| | - Baoming Shi
- Institute of Animal Nutrition, Northeast Agricultural University, Harbin, China
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7
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Costa G, Fernandes A, Santos T, Brito L, Rodrigues L, Valadares M, Felzenszwalb I, Ferraz E, Morais Leme D, Oliveira G. In vitro and in vivo cytotoxicity assessment of glyphosate and imazethapyr-based herbicides and their association. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2022; 85:481-493. [PMID: 35189772 DOI: 10.1080/15287394.2022.2036281] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Resistance to glyphosate herbicide has initiated usage of combined application of herbicides as a weed control measure. Imazethapyr-based herbicides associated with glyphosate herbicide seem to be an alternative to suppress weed resistance. The aim of this study was to examine the adverse effects of Glyphosate Atanor 48® (ATN) and Imazethapyr Plus Nortox® (IMZT) formulations in both single forms and mixtures using HepG2 cells and zebrafish early-life stages models. Data demonstrated cytotoxicity due to exposure to ATN, IMZT for both models, as follows: (1) ATN (0.5 mg/L), IMZT (5 mg/L), and M3 (0.05 mg/L ATN + 5 mg/L IMZT) increased cytotoxicity by disturbing the mitochondrial activity of HepG2 cells 24 hr after exposure; (2) ATN and IMZT (5 mg/L), and M3 (0.05 mg/L ATN + 5 mg/L IMZT) also decreased the integrity of the membrane of HepG2 cells after 24 hr incubation; (3) only ATN and IMZT (5 mg/L) in their single forms diminished the mitochondrial potential of zebrafish; (4) ATN (single form) at 0.5 mg/L induced apoptosis in zebrafish larvae. In conclusion, these herbicides in their single forms appeared to produce greater cytotoxicity to HepG2 cells and zebrafish compared to the herbicide mixtures.
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Affiliation(s)
- Gessyca Costa
- Environmental Toxicology Research Laboratory (EnvTox), Faculty of Pharmacy, Federal University of Goiás (UFG), Goiânia, Brazil
| | - Andréia Fernandes
- Department of Biophysics and Biometry, Institute of Biology Roberto Alcantara Gomes, State University of Rio de Janeiro (UERJ), Rio de Janeiro, Brazil
| | - Thaís Santos
- Laboratory of Teaching and Research in Toxicology in Vitro (ToxIn), Faculty of Pharmacy, Federal University of Goiás (UFG), Goiânia, Brazil
| | - Lara Brito
- Environmental Toxicology Research Laboratory (EnvTox), Faculty of Pharmacy, Federal University of Goiás (UFG), Goiânia, Brazil
- Laboratory of Teaching and Research in Toxicology in Vitro (ToxIn), Faculty of Pharmacy, Federal University of Goiás (UFG), Goiânia, Brazil
| | - Laís Rodrigues
- Environmental Toxicology Research Laboratory (EnvTox), Faculty of Pharmacy, Federal University of Goiás (UFG), Goiânia, Brazil
| | - Marize Valadares
- Laboratory of Teaching and Research in Toxicology in Vitro (ToxIn), Faculty of Pharmacy, Federal University of Goiás (UFG), Goiânia, Brazil
| | - Israel Felzenszwalb
- Department of Biophysics and Biometry, Institute of Biology Roberto Alcantara Gomes, State University of Rio de Janeiro (UERJ), Rio de Janeiro, Brazil
| | - Elisa Ferraz
- Department of Pharmacy and Pharmaceutical Administration, Pharmacy College, Fluminense Federal University (UFF), Niterói, Brazil
- Institute of Chemistry, National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM), UNESP, Araraquara, Brazil
| | - Daniela Morais Leme
- Institute of Chemistry, National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM), UNESP, Araraquara, Brazil
- Departament of Genetics, Federal University of Paraná (UFPR), Curitiba, Brazil
| | - Gisele Oliveira
- Environmental Toxicology Research Laboratory (EnvTox), Faculty of Pharmacy, Federal University of Goiás (UFG), Goiânia, Brazil
- Institute of Chemistry, National Institute for Alternative Technologies of Detection, Toxicological Evaluation and Removal of Micropollutants and Radioactives (INCT-DATREM), UNESP, Araraquara, Brazil
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8
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Abrão LDC, Costa-Silva DG, Santos MGD, Cerqueira MBR, Badiale-Furlong E, Muccillo-Baisch AL, Hort MA. Toxicity evaluation of traditional and organic yerba mate ( Ilex paraguariensis A. St.-Hil.) extracts. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2022; 85:461-479. [PMID: 35189780 DOI: 10.1080/15287394.2022.2035873] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Yerba mate (Ilex paraguariensis A. St.-Hil.) is an important source of biologically active compounds with pharmacological potential. The aim of this study was to examine the toxicity of different extracts obtained from either traditional or organic cultivated yerba mate in vitro and in vivo. Aqueous, ethanolic and methanolic extracts were obtained from commercial samples of yerba mate and total phenolic content was determined employing Folin-Ciocalteau reagent. The aqueous extracts presented higher content of total phenols, compared to ethanolic and methanolic extracts, and also demonstrated lower cytotoxicity, which is the basis for testing were carried out only using aqueous extracts. The main phenolic acids found in traditional aqueous (TA) extract were chlorogenic, gallic and protocatechuic acids. Gallic and hydroxybenzoic acids were detected in aqueous cultivated organic (OA) extract. Pretreatment with OA extract (100 µg/ml, 1 hr) was cytoprotective against rotenone-induced toxicity (1 µM). For in vivo toxicity assay, zebrafish embryos were exposed to OA or TA extracts (10-160 µg/ml) at 4 hr post fertilization. TA extract decreased embryos survival in a concentration-dependent manner, reduced the hatching rate at 40 µg/ml, increased edema frequency at 80 µg/ml and altered body curvature at 120 µg/ml. Further, TA extract produced locomotor disorders at concentrations equal to or greater than 10 µg/ml. In contrast, OA extract exhibited no apparent toxic effect on organogenesis and behavior up to 100 µg/ml. In summary, the OA cultivated extract showed the lowest cytotoxicity in vitro, enhanced reduction in rotenone-induced toxicity, and produced less toxicity in zebrafish embryos compared to the TA extract.
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Affiliation(s)
- Lian da Costa Abrão
- Programa de Pós-graduação em Ciências da Saúde, Faculdade de Medicina, Universidade Federal do Rio Grande, Rio Grande, Brazil
| | - Dennis Guilherme Costa-Silva
- Programa de Pós-graduação em Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande, Rio Grande, Brazil
| | - Michele Goulart Dos Santos
- Programa de Pós-graduação em Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande, Rio Grande, Brazil
| | | | - Eliana Badiale-Furlong
- Programa de Pós-graduação em Engenharia e Ciência de Alimentos, Escola de Química e Alimentos, Universidade Federal do Rio Grande, Brazil
| | - Ana Luiza Muccillo-Baisch
- Programa de Pós-graduação em Ciências da Saúde, Faculdade de Medicina, Universidade Federal do Rio Grande, Rio Grande, Brazil
| | - Mariana Appel Hort
- Programa de Pós-graduação em Ciências da Saúde, Faculdade de Medicina, Universidade Federal do Rio Grande, Rio Grande, Brazil
- Programa de Pós-graduação em Ciências Fisiológicas, Instituto de Ciências Biológicas, Universidade Federal do Rio Grande, Rio Grande, Brazil
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Moser VC, Morris-Schaffer K, Richardson JR, Li AA. Glyphosate and neurological outcomes: A systematic literature review of animal studies. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART B, CRITICAL REVIEWS 2022; 25:162-209. [PMID: 35676826 DOI: 10.1080/10937404.2022.2083739] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
Studies of nervous system effects of glyphosate, a widely used herbicide, have not been critically examined. The aim of this paper was to systematically review glyphosate-induced neurotoxicity literature to determine its usefulness in regulatory decision-making. The review was restricted to mammalian studies of behavior, neuropathology, and neuropharmacology; in vitro and other biochemical studies were considered supplementary information. Glyphosate formulation studies were also considered, despite uncertainties regarding toxicities of the formulated products; no studies used a formulation vehicle as the control. Inclusion criteria were developed a priori to ensure consistent evaluation of studies, and in vivo investigations were also ranked using ToxRTool software to determine reliability. There were 27 in vivo studies (open literature and available regulatory reports), but 11 studies were considered unreliable (mostly due to critical methodological deficiencies). There were only seven acceptable investigations on glyphosate alone. Studies differed in terms of dosing scenarios, experimental designs, test species, and commercial product. Limitations included using only one dose and/or one test time, small sample sizes, limited data presentation, and/or overtly toxic doses. While motor activity was the most consistently affected endpoint (10 of 12 studies), there were considerable differences in outcomes. In six investigations, there were no marked neuropathological changes in the central or peripheral nervous system. Other neurological effects were less consistent, and some outcomes were less convincing due to influences including high variability and small effect sizes. Taken together, these studies do not demonstrate a consistent impact of glyphosate on the structure or function of the mammalian nervous system.
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Affiliation(s)
| | - Keith Morris-Schaffer
- Exponent Inc, Center for Chemical Regulation and Food Safety, Sacramento, California
| | - Jason R Richardson
- Department of Environmental Health Sciences, Robert Stempel School of Public Health and Social Work, Florida International University, Miami, FL, United States
| | - Abby A Li
- Exponent Inc, Center for Health Sciences, Oakland, CA, United States
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10
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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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Wang X, Lu Q, Guo J, Ares I, Martínez M, Martínez-Larrañaga MR, Wang X, Anadón A, Martínez MA. Oxidative Stress and Metabolism: A Mechanistic Insight for Glyphosate Toxicology. Annu Rev Pharmacol Toxicol 2022; 62:617-639. [PMID: 34990202 DOI: 10.1146/annurev-pharmtox-020821-111552] [Citation(s) in RCA: 29] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Glyphosate (GLYP) is a widely used pesticide; it is considered to be a safe herbicide for animals and humans because it targets 5-enolpyruvylshikimate-3-phosphate synthase. However, there has been increasing evidence that GLYP causes varying degrees of toxicity. Moreover, oxidative stress and metabolism are highly correlated with toxicity. This review provides a comprehensive introduction to the toxicity of GLYP and, for the first time, systematically summarizes the toxicity mechanism of GLYP from the perspective of oxidative stress, including GLYP-mediated oxidative damage, changes in antioxidant status, altered signaling pathways, and the regulation of oxidative stress by exogenous substances. In addition, the metabolism of GLYP is discussed, including metabolites,metabolic pathways, metabolic enzymes, and the toxicity of metabolites. This review provides new ideas for the toxicity mechanism of GLYP and proposes effective strategies for reducing its toxicity.
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Affiliation(s)
- Xiaojing Wang
- National Reference Laboratory of Veterinary Drug Residues and MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, Hubei 430070, China;
| | - Qirong Lu
- National Reference Laboratory of Veterinary Drug Residues and MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, Hubei 430070, China;
| | - Jingchao Guo
- National Reference Laboratory of Veterinary Drug Residues and MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, Hubei 430070, China;
| | - Irma Ares
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Universidad Complutense de Madrid, and Research Institute Hospital 12 de Octubre, 28040 Madrid, Spain;
| | - Marta Martínez
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Universidad Complutense de Madrid, and Research Institute Hospital 12 de Octubre, 28040 Madrid, Spain;
| | - María-Rosa Martínez-Larrañaga
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Universidad Complutense de Madrid, and Research Institute Hospital 12 de Octubre, 28040 Madrid, Spain;
| | - Xu Wang
- National Reference Laboratory of Veterinary Drug Residues and MAO Key Laboratory for Detection of Veterinary Drug Residues, Huazhong Agricultural University, Wuhan, Hubei 430070, China;
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Universidad Complutense de Madrid, and Research Institute Hospital 12 de Octubre, 28040 Madrid, Spain;
- MAO Laboratory for Risk Assessment of Quality and Safety of Livestock and Poultry Products, Huazhong Agricultural University, Wuhan, Hubei 430070, China
- Hubei Collaborative Innovation Center for Animal Nutrition and Feed Safety, Wuhan, Hubei 430023, China
| | - Arturo Anadón
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Universidad Complutense de Madrid, and Research Institute Hospital 12 de Octubre, 28040 Madrid, Spain;
| | - María-Aránzazu Martínez
- Department of Pharmacology and Toxicology, Faculty of Veterinary Medicine, Universidad Complutense de Madrid, and Research Institute Hospital 12 de Octubre, 28040 Madrid, Spain;
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Masood MI, Naseem M, Warda SA, Tapia-Laliena MÁ, Rehman HU, Nasim MJ, Schäfer KH. Environment permissible concentrations of glyphosate in drinking water can influence the fate of neural stem cells from the subventricular zone of the postnatal mouse. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2021; 270:116179. [PMID: 33348142 DOI: 10.1016/j.envpol.2020.116179] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2020] [Revised: 11/03/2020] [Accepted: 11/26/2020] [Indexed: 06/12/2023]
Abstract
The developing nervous system is highly vulnerable to environmental toxicants especially pesticides. Glyphosate pesticide induces neurotoxicity both in humans and rodents, but so far only when exposed to higher concentrations. A few studies, however, have also reported the risk of general toxicity of glyphosate at concentrations comparable to allowable limits set up by environmental protection authorities. In vitro data regarding glyphosate neurotoxicity at concentrations comparable to maximum permissible concentrations in drinking water is lacking. In the present study, we established an in vitro assay based upon neural stem cells (NSCs) from the subventricular zone of the postnatal mouse to decipher the effects of two maximum permissible concentrations of glyphosate in drinking water on the basic neurogenesis processes. Our results demonstrated that maximum permissible concentrations of glyphosate recognized by environmental protection authorities significantly reduced the cell migration and differentiation of NSCs as demonstrated by the downregulation of the expression levels of the neuronal ß-tubulin III and the astrocytic S100B genes. The expression of the cytoprotective gene CYP1A1 was downregulated whilst the expression of oxidative stresses indicator gene SOD1 was upregulated. The concentration comparable to non-toxic human plasma concentration significantly induced cytotoxicity and activated Ca2+ signalling in the differentiated culture. Our findings demonstrated that the permissible concentrations of glyphosate in drinking water recognized by environmental protection authorities are capable of inducing neurotoxicity in the developing nervous system.
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Affiliation(s)
- Muhammad Irfan Masood
- Division of Bioorganic Chemistry, School of Pharmacy, Saarland University, Saarbrücken, D-66123, Germany; Working Group Enteric Nervous System, University of Applied Sciences Kaiserslautern, Campus Zweibrücken, 66482, Germany; Institute of Pharmaceutical Sciences, University of Veterinary and Animal Sciences, Lahore, 54000, Pakistan.
| | - Mahrukh Naseem
- Department of Zoology, University of Balochistan, Quetta, 87550, Pakistan
| | - Salam A Warda
- Working Group Enteric Nervous System, University of Applied Sciences Kaiserslautern, Campus Zweibrücken, 66482, Germany
| | | | - Habib Ur Rehman
- Department of Physiology, University of Veterinary and Animal Sciences, Lahore, 54000, Pakistan
| | - Muhammad Jawad Nasim
- Division of Bioorganic Chemistry, School of Pharmacy, Saarland University, Saarbrücken, D-66123, Germany
| | - Karl Herbert Schäfer
- Working Group Enteric Nervous System, University of Applied Sciences Kaiserslautern, Campus Zweibrücken, 66482, Germany; Department of Pediatric Surgery Mannheim, University Medicine Mannheim, University of Heidelberg, Mannheim, 68167, Germany.
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