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Pall ML. Central Causation of Autism/ASDs via Excessive [Ca 2+]i Impacting Six Mechanisms Controlling Synaptogenesis during the Perinatal Period: The Role of Electromagnetic Fields and Chemicals and the NO/ONOO(-) Cycle, as Well as Specific Mutations. Brain Sci 2024; 14:454. [PMID: 38790433 PMCID: PMC11119459 DOI: 10.3390/brainsci14050454] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2024] [Revised: 04/23/2024] [Accepted: 04/25/2024] [Indexed: 05/26/2024] Open
Abstract
The roles of perinatal development, intracellular calcium [Ca2+]i, and synaptogenesis disruption are not novel in the autism/ASD literature. The focus on six mechanisms controlling synaptogenesis, each regulated by [Ca2+]i, and each aberrant in ASDs is novel. The model presented here predicts that autism epidemic causation involves central roles of both electromagnetic fields (EMFs) and chemicals. EMFs act via voltage-gated calcium channel (VGCC) activation and [Ca2+]i elevation. A total of 15 autism-implicated chemical classes each act to produce [Ca2+]i elevation, 12 acting via NMDA receptor activation, and three acting via other mechanisms. The chronic nature of ASDs is explained via NO/ONOO(-) vicious cycle elevation and MeCP2 epigenetic dysfunction. Genetic causation often also involves [Ca2+]i elevation or other impacts on synaptogenesis. The literature examining each of these steps is systematically examined and found to be consistent with predictions. Approaches that may be sed for ASD prevention or treatment are discussed in connection with this special issue: The current situation and prospects for children with ASDs. Such approaches include EMF, chemical avoidance, and using nutrients and other agents to raise the levels of Nrf2. An enriched environment, vitamin D, magnesium, and omega-3s in fish oil may also be helpful.
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Affiliation(s)
- Martin L Pall
- School of Molecular Biosciences, Washington State University, Pullman, WA 99164, USA
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Saleh SMM, Mohamed IA, Fathy M, Sayed AEDH. Neuro-hepatopathological changes in juvenile Oreochromis niloticus exposed to sublethal concentrations of commercial herbicides. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2022; 93:103871. [PMID: 35500867 DOI: 10.1016/j.etap.2022.103871] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/06/2022] [Accepted: 04/26/2022] [Indexed: 02/07/2023]
Abstract
The current study estimates the impact of different common herbicides on antioxidant defenses and histological structure of liver and spinal cord of juvenile tilapia. Eighty-four fish were divided into seven groups: group 1 fish acted as controls and the remaining fish were exposed to sublethal concentrations of acetochlor, bispyribac-sodium, bentazon, bensulfuron-methyl, halosulfuron-methyl, or quinclorac at sublethal concentrations 2.625, 0.800, 36.00, 2.50, 1.275, and 11.250 mg/l, respectively, for 96 h. Antioxidant parameters changed in response to some test herbicides and the greatest effects were caused by exposure to acetochlor and quinelorac for all antioxidant measurements. Prominent histological changes in liver tissue included loss of liver architecture and the appearance of fatty liver cells, necrotic areas, foci of leukocytic infiltration and many apoptotic cells. The most obvious changes in the spinal cord in all treated fish were degradation of myelinated white matter fibers with the emergence of empty spaces, large aggregation of pyknotic neuroglial nuclei, and damaged areas in the dorsal horn of gray matter. Collectively, the harmful effect of tested herbicides on antioxidant capacity and significant alterations in histological structures of liver and spinal cord of Oreochromis niloticus.
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Affiliation(s)
- Shaimaa M M Saleh
- Department of Zoology and Entomology, Faculty of Science, Assiut University, Assiut 71516, Egypt
| | - Ibrahim A Mohamed
- Plant protection Department, Faculty of Agriculture, Assiut University, Assiut 71526, Egypt
| | - Mohamed Fathy
- Plant protection Department, Faculty of Agriculture, Assiut University, Assiut 71526, Egypt
| | - Alaa El-Din H Sayed
- Department of Zoology and Entomology, Faculty of Science, Assiut University, Assiut 71516, Egypt.
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Oyem JC, Chris-Ozoko LE, Enaohwo MT, Otabor FO, Okudayo VA, Udi OA. Antioxidative properties of Ocimum gratissimum alters Lead acetate induced oxidative damage in lymphoid tissues and hematological parameters of adult Wistar rats. Toxicol Rep 2021; 8:215-222. [PMID: 33511038 PMCID: PMC7817492 DOI: 10.1016/j.toxrep.2021.01.003] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 12/11/2020] [Accepted: 01/04/2021] [Indexed: 11/18/2022] Open
Abstract
Chronic lead toxicity was induced in male rats by oral administration of lead acetate. Effect of Ocimum gratissimum in lead acetate toxicity on spleen, thymus, and blood. Oral lead acetate administration led to oxidative damage in spleen, thymus and blood. Ocimum gratissimum extract reversed oxidative stress and enhanced antioxidant enzymes. Ocimum gratissimum averts lead acetate-induced toxicity in the blood, thymus and spleen.
Lead exposure is a well-known environmental hazard. Its accumulation in humans may pose a danger to health. The present study investigated the beneficial effect of Ocimum gratissimum extract (OG) in reducing lead acetate (LA) induced oxidative damage in the spleen, thymus, and hematological indices. We employed an in vivo model of LA induced Wistar rats and administered 125 mg/kg/bw and 250 mg/kg/bw of OG extracts respectively. Our control groups were divided into 2; the first group received normal saline, feed, and water while the second group was administered OG extracts only. We assessed the levels of malondialdehyde (MDA), glutathione (GSH), superoxide dismutase (SOD), and catalase (CAT) in the thymus and spleen and estimated percentages of blood cells. Our results showed that LA induces oxidative damage by significantly elevating MDA and diminishing GSH levels, SOD, and CAT activities. LA administration led to a significant decline in blood parameters. However, co-administration with OG compensated oxidative stress by significantly reducing MDA, increasing GSH, SOD, and CAT. Oral administration of OG to rats attenuated anemia, thrombocytopenia, leucocytosis, eosinophilia, monocytosis, and neutropenia induced by LA. The present study indicates that LA induced Spleen, thymus, and blood toxicity, which was reversed by oral OG administration.
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Key Words
- Antioxidation
- BW, Bodyweight
- CAT, Catalase
- GSH, Glutathione
- H2O2, Hydrogen peroxide
- Hb, Hemaglobin
- LA, Lead Acetate
- Lead acetate
- MDA, malondialdehyde
- OG, Ocimum gratissimum
- Ocimum gratissimum
- Oxidative stress
- RBC, Red Blood Cell
- ROS, Reactive Oxygen Species
- SOD, Superoxide Dismustase
- Spleen
- Thymus
- WBC, White Blood Cell
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Affiliation(s)
- John Chukwuma Oyem
- Department of Human Anatomy and Cell Biology, Faculty of Basic Medical Sciences, Delta State University, Abraka, Nigeria
| | - Lilian Ebite Chris-Ozoko
- Department of Human Anatomy and Cell Biology, Faculty of Basic Medical Sciences, Delta State University, Abraka, Nigeria
| | - Mamerhi Taniyohwo Enaohwo
- Department of Human Anatomy and Cell Biology, Faculty of Basic Medical Sciences, Delta State University, Abraka, Nigeria
| | - Francisca Osamahemwem Otabor
- Department of Human Anatomy and Cell Biology, Faculty of Basic Medical Sciences, Delta State University, Abraka, Nigeria
| | - Vera Anieze Okudayo
- Department of Human Anatomy and Cell Biology, Faculty of Basic Medical Sciences, Delta State University, Abraka, Nigeria
| | - Onoriode Andrew Udi
- Department of Basic Medical Sciences (Anatomy Unit), College of Natural and Applied Sciences, Achievers University Owo, Ondo State, Nigeria
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Mesnage R, Teixeira M, Mandrioli D, Falcioni L, Ducarmon QR, Zwittink RD, Mazzacuva F, Caldwell A, Halket J, Amiel C, Panoff JM, Belpoggi F, Antoniou MN. Use of Shotgun Metagenomics and Metabolomics to Evaluate the Impact of Glyphosate or Roundup MON 52276 on the Gut Microbiota and Serum Metabolome of Sprague-Dawley Rats. ENVIRONMENTAL HEALTH PERSPECTIVES 2021; 129:17005. [PMID: 33502259 PMCID: PMC7839352 DOI: 10.1289/ehp6990] [Citation(s) in RCA: 71] [Impact Index Per Article: 23.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/28/2020] [Revised: 12/10/2020] [Accepted: 12/11/2020] [Indexed: 05/04/2023]
Abstract
BACKGROUND There is intense debate on whether glyphosate can inhibit the shikimate pathway of gastrointestinal microorganisms, with potential health implications. OBJECTIVES We tested whether glyphosate or its representative EU herbicide formulation Roundup MON 52276 affects the rat gut microbiome. METHODS We combined cecal microbiome shotgun metagenomics with serum and cecum metabolomics to assess the effects of glyphosate [0.5, 50, 175 mg / kg body weight ( BW ) per day ] or MON 52276 at the same glyphosate-equivalent doses, in a 90-d toxicity test in rats. RESULTS Glyphosate and MON 52276 treatment resulted in ceca accumulation of shikimic acid and 3-dehydroshikimic acid, suggesting inhibition of 5-enolpyruvylshikimate-3-phosphate synthase of the shikimate pathway in the gut microbiome. Cysteinylglycine, γ -glutamylglutamine , and valylglycine levels were elevated in the cecal microbiome following glyphosate and MON 52276 treatments. Altered cecum metabolites were not differentially expressed in serum, suggesting that the glyphosate and MON 52276 impact on gut microbial metabolism had limited consequences on physiological biochemistry. Serum metabolites differentially expressed with glyphosate treatment were associated with nicotinamide, branched-chain amino acid, methionine, cysteine, and taurine metabolism, indicative of a response to oxidative stress. MON 52276 had similar, but more pronounced, effects than glyphosate on the serum metabolome. Shotgun metagenomics of the cecum showed that treatment with glyphosate and MON 52276 resulted in higher levels of Eggerthella spp., Shinella zoogleoides, Acinetobacter johnsonii, and Akkermansia muciniphila. Shinella zoogleoides was higher only with MON 52276 exposure. In vitro culture assays with Lacticaseibacillus rhamnosus strains showed that Roundup GT plus inhibited growth at concentrations at which MON 52276 and glyphosate had no effect. DISCUSSION Our study highlights the power of multi-omics approaches to investigate the toxic effects of pesticides. Multi-omics revealed that glyphosate and MON 52276 inhibited the shikimate pathway in the rat gut microbiome. Our findings could be used to develop biomarkers for epidemiological studies aimed at evaluating the effects of glyphosate herbicides on humans. https://doi.org/10.1289/EHP6990.
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Affiliation(s)
- Robin Mesnage
- Gene Expression and Therapy Group, Department of Medical and Molecular Genetics, King’s College London, Faculty of Life Sciences & Medicine, Guy’s Hospital, London, UK
| | - Maxime Teixeira
- Unité de Recherche Aliments Bioprocédés Toxicologie Environnements, University of Caen Normandy, Caen, France
| | | | | | - Quinten Raymond Ducarmon
- Center for Microbiome Analyses and Therapeutics, Leiden University Medical Center, Leiden, Netherlands
| | - Romy Daniëlle Zwittink
- Center for Microbiome Analyses and Therapeutics, Leiden University Medical Center, Leiden, Netherlands
| | | | - Anna Caldwell
- Mass Spectrometry Facility, King’s College London, London, UK
| | - John Halket
- Mass Spectrometry Facility, King’s College London, London, UK
| | - Caroline Amiel
- Unité de Recherche Aliments Bioprocédés Toxicologie Environnements, University of Caen Normandy, Caen, France
| | - Jean-Michel Panoff
- Unité de Recherche Aliments Bioprocédés Toxicologie Environnements, University of Caen Normandy, Caen, France
| | | | - Michael Nicolas Antoniou
- Gene Expression and Therapy Group, Department of Medical and Molecular Genetics, King’s College London, Faculty of Life Sciences & Medicine, Guy’s Hospital, London, UK
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Rainio MJ, Margus A, Virtanen V, Lindström L, Salminen JP, Saikkonen K, Helander M. Glyphosate-based herbicide has soil-mediated effects on potato glycoalkaloids and oxidative status of a potato pest. CHEMOSPHERE 2020; 258:127254. [PMID: 32559492 DOI: 10.1016/j.chemosphere.2020.127254] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Revised: 05/27/2020] [Accepted: 05/28/2020] [Indexed: 05/15/2023]
Abstract
Glyphosate is the most used herbicide worldwide, targeting physiological pathways in plants. Recent studies have shown that glyphosate can also cause toxic effects in animals. We investigated the glyphosate-based herbicide (GBH)-induced changes in potato (Solanum tuberosum) plant chemistry and the effects of a GBH on the survival rate and oxidative status of the Colorado potato beetle (Leptinotarsa decemlineata). The beetles were reared on potato plants grown in pots containing soil treated with a GBH (Roundup Gold, 450 g/l) or untreated soil (water control). The 2nd instar larvae were introduced to the potato plants and then collected in 2 phases: as 4th instar larvae and as adults. The main glycoalkaloids of the potato plants, α-solanine and α-chaconine, were measured twice during the experiment. The α-solanine was reduced in potato plants grown in GBH-treated soil, which can be detrimental to plant defenses against herbivores. GBH treatment had no effect on the survival rate or body mass of the larvae or the adult beetles. In the larvae, total glutathione (tGSH) concentration and the enzyme activity of catalase (CAT), superoxide dismutase, and glutathione-S-transferase were increased in the GBH treatment group. In the adult beetles, CAT activity and tGSH levels were affected by the interactive effect of GBH treatment and the body mass. To conclude, environmentally relevant concentrations of a GBH can affect the potato plant's glycoalkaloid concentrations, but are not likely to directly affect the survival rate of the Colorado potato beetle, but instead, modify the antioxidant defense of the beetles via diet.
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Affiliation(s)
- Miia J Rainio
- Department of Biology, University of Turku, FI-20014, Turku, Finland.
| | - Aigi Margus
- Department of Biological and Environmental Science, University of Jyväskylä, FI-40014, Jyväskylä, Finland.
| | - Valtteri Virtanen
- Department of Chemistry, University of Turku, FI-20014, Turku, Finland.
| | - Leena Lindström
- Department of Biological and Environmental Science, University of Jyväskylä, FI-40014, Jyväskylä, Finland.
| | | | - Kari Saikkonen
- Biodiversity Unit, University of Turku, FI-20014, Turku, Finland.
| | - Marjo Helander
- Department of Biology, University of Turku, FI-20014, Turku, Finland.
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Samsel A, Seneff S. Glyphosate, pathways to modern diseases III: Manganese, neurological diseases, and associated pathologies. Surg Neurol Int 2015; 6:45. [PMID: 25883837 PMCID: PMC4392553 DOI: 10.4103/2152-7806.153876] [Citation(s) in RCA: 65] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2014] [Accepted: 01/21/2015] [Indexed: 12/20/2022] Open
Abstract
Manganese (Mn) is an often overlooked but important nutrient, required in small amounts for multiple essential functions in the body. A recent study on cows fed genetically modified Roundup(®)-Ready feed revealed a severe depletion of serum Mn. Glyphosate, the active ingredient in Roundup(®), has also been shown to severely deplete Mn levels in plants. Here, we investigate the impact of Mn on physiology, and its association with gut dysbiosis as well as neuropathologies such as autism, Alzheimer's disease (AD), depression, anxiety syndrome, Parkinson's disease (PD), and prion diseases. Glutamate overexpression in the brain in association with autism, AD, and other neurological diseases can be explained by Mn deficiency. Mn superoxide dismutase protects mitochondria from oxidative damage, and mitochondrial dysfunction is a key feature of autism and Alzheimer's. Chondroitin sulfate synthesis depends on Mn, and its deficiency leads to osteoporosis and osteomalacia. Lactobacillus, depleted in autism, depend critically on Mn for antioxidant protection. Lactobacillus probiotics can treat anxiety, which is a comorbidity of autism and chronic fatigue syndrome. Reduced gut Lactobacillus leads to overgrowth of the pathogen, Salmonella, which is resistant to glyphosate toxicity, and Mn plays a role here as well. Sperm motility depends on Mn, and this may partially explain increased rates of infertility and birth defects. We further reason that, under conditions of adequate Mn in the diet, glyphosate, through its disruption of bile acid homeostasis, ironically promotes toxic accumulation of Mn in the brainstem, leading to conditions such as PD and prion diseases.
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Affiliation(s)
- Anthony Samsel
- Research Scientist and Consultant, Deerfield, NH 03037, USA
| | - Stephanie Seneff
- Spoken Language Systems Group, Computer Science and Artificial Intelligence Laboratory, MIT, Cambridge MA 02139, USA
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8
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Braconi D, Bernardini G, Fiorani M, Azzolini C, Marzocchi B, Proietti F, Collodel G, Santucci A. Oxidative damage induced by herbicides is mediated by thiol oxidation and hydroperoxides production. Free Radic Res 2010; 44:891-906. [DOI: 10.3109/10715762.2010.489111] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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Astiz M, de Alaniz MJT, Marra CA. Antioxidant defense system in rats simultaneously intoxicated with agrochemicals. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2009; 28:465-473. [PMID: 21784044 DOI: 10.1016/j.etap.2009.07.009] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2009] [Revised: 07/29/2009] [Accepted: 07/30/2009] [Indexed: 05/31/2023]
Abstract
The effect of dimethoate, zineb and glyphosate administered alone or in combination on liver, kidney, brain and plasma antioxidant defense system was investigated. Lipid peroxidation, and RNS production were increased in all tissues studied, especially in those groups that received a combination of drugs. Intoxicated rats exhibited lower antioxidant ability, higher oxidized protein and glutathione levels in plasma with a decreased concentration of α-tocopherol in brain and liver, between 30% and 60% of control. Superoxide dismutase was decreased in liver and brain. Glutathione reductase was inhibited in liver while glutathione peroxidase and transferase were unaffected. Plasma lactate dehydrogenase and γ-glutamyl transpeptidase activities were both increased. The associations of drugs produce more damage than individual administration being the effects observed strongly dependent on the kind of tissue analyzed. In conclusion, the present paper evidenced both the role of the oxidative stress as a mechanism of action of some pesticides and the potential additive effects of a simultaneous exposure to more than one compound. In addition, results suggest a potential contribution of pesticide mixtures to the aetiology of some neurodegenerative diseases.
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Affiliation(s)
- Mariana Astiz
- INIBIOLP (Instituto de Investigaciones Bioquímicas de La Plata), CCT La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, Calles 60 y 120, 1900 La Plata, Argentina
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Astiz M, de Alaniz MJT, Marra CA. Effect of pesticides on cell survival in liver and brain rat tissues. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2009; 72:2025-2032. [PMID: 19493570 DOI: 10.1016/j.ecoenv.2009.05.001] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2009] [Revised: 04/16/2009] [Accepted: 05/01/2009] [Indexed: 05/27/2023]
Abstract
Pesticides are the main environmental factor associated with the etiology of human neurodegenerative disorders such as Parkinson's disease. Our laboratory has previously demonstrated that the treatment of rats with low doses of dimethoate, zineb or glyphosate alone or in combination induces oxidative stress (OS) in liver and brain. The aim of the present work was to investigate if the pesticide-induced OS was able to affect brain and liver cell survival. The treatment of Wistar rats with the pesticides (i.p. 1/250 LD50, three times a week for 5 weeks) caused loss of mitochondrial transmembrane potential and cardiolipin content, especially in substantia nigra (SN), with a concomitant increase of fatty acid peroxidation. The activation of calpain apoptotic cascade (instead of the caspase-dependent pathway) would be responsible for the DNA fragmentation pattern observed. Thus, these results may contribute to understand the effect(s) of chronic and simultaneous exposure to pesticides on cell survival.
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Affiliation(s)
- Mariana Astiz
- INIBIOLP (Instituto de Investigaciones Bioquímicas de La Plata), CCT La Plata, CONICET-UNLP, Cátedra de Bioquímica y Biología Molecular, Facultad de Ciencias Médicas, Universidad Nacional de La Plata, 60 y 120 (1900) La Plata, Argentina.
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Contardo-Jara V, Klingelmann E, Wiegand C. Bioaccumulation of glyphosate and its formulation Roundup Ultra in Lumbriculus variegatus and its effects on biotransformation and antioxidant enzymes. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2009; 157:57-63. [PMID: 18790555 DOI: 10.1016/j.envpol.2008.07.027] [Citation(s) in RCA: 99] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2008] [Revised: 07/29/2008] [Accepted: 07/31/2008] [Indexed: 05/26/2023]
Abstract
The bioaccumulation potential of glyphosate and the formulation Roundup Ultra, as well as possible effects on biotransformation and antioxidant enzymes in Lumbriculus variegatus were compared by four days exposure to concentrations between 0.05 and 5 mg L(-1) pure glyphosate and its formulation. Bioaccumulation was determined using (14)C labeled glyphosate. The bioaccumulation factor (BCF) varied between 1.4 and 5.9 for the different concentrations, and was higher than estimated from logP(ow). Glyphosate and its surfactant POEA caused elevation of biotransformation enzyme soluble glutathione S-transferase at non-toxic concentrations. Membrane bound glutathione S-transferase activity was significantly elevated in Roundup Ultra exposed worms, compared to treatment with equal glyphosate concentrations, but did not significantly differ from the control. Antioxidant enzyme superoxide dismutase was significantly increased by glyphosate but in particular by Roundup Ultra exposure indicating oxidative stress. The results show that the formulation Roundup Ultra is of more ecotoxicological relevance than the glyphosate itself.
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Affiliation(s)
- Valeska Contardo-Jara
- Leibniz-Institute of Freshwater Ecology and Inland Fisheries, Department of Inland Fisheries, Biochemical Regulation, Müggelseedamm 301, 12587 Berlin, Germany
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Ramírez-Duarte WF, Rondón-Barragán IS, Eslava-Mocha PR. Acute toxicity and histopathological alterations of Roundup® herbicide on "cachama blanca" (Piaractus brachypomus). PESQUISA VETERINARIA BRASILEIRA 2008. [DOI: 10.1590/s0100-736x2008001100002] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Acute toxicity of the glyphosate -N (phosphonomethyl) glycine- herbicide, Roundup®, in juveniles of cachama blanca, (Piaractus brachypomus), was evaluated and the histopathological lesions were assessed. The 96 h lethal concentration 50 was 97.47mg.L-1 (P<0.05). In the gill, necrotic and proliferative lesions were detected. In the liver, congestion, degenerative foci, hyaline droplets and lipidic vacuolization of the hepatocytes were observed. In the stomach mild hyperplasia of mucous cells was detected, which was also observed in the skin. In this latter tissue, a large increase in the thickness of the epidermis with necrotic lesions, infiltration of leukocytes and melanin pigment were observed. In the brain, degenerative foci of neuronal bodies in the telencephalon associated with gliosis and infiltration of eosinophilic granule cells/mast cells were shown. In conclusion, gills, liver, skin and brain are susceptible to Roundup®. Moreover, effects on the central nervous system could affect olfaction as well as individual and group behavior, the reproductive performance of the fish and hence have repercussions at the population level.
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Costa MJ, Monteiro DA, Oliveira-Neto AL, Rantin FT, Kalinin AL. Oxidative stress biomarkers and heart function in bullfrog tadpoles exposed to Roundup Original. ECOTOXICOLOGY (LONDON, ENGLAND) 2008; 17:153-63. [PMID: 17987383 DOI: 10.1007/s10646-007-0178-5] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2007] [Accepted: 10/15/2007] [Indexed: 05/25/2023]
Abstract
Oxidative stress biomarkers, in vivo heart rate (f (H)), and contraction dynamics of ventricle strips of bullfrog (Lithobates catesbeiana) tadpoles were evaluated after 48 h of exposure to a sub-lethal concentration (1 ppm) of the herbicide Roundup Original (glyphosate 41%). The activities of the antioxidant enzymes superoxide dismutase and catalase were increased in the liver and decreased in muscle, while oxidative damage to lipids increased above control values in both tissues, showing that the generation of reactive oxygen species and oxidative stress are involved in the toxicity induced by Roundup. Additionally, tadpoles' hyperactivity was associated with tachycardia in vivo, probably due to a stress-induced adrenergic stimulation. Ventricle strips of Roundup-exposed tadpoles (R-group) presented a faster relaxation and also a higher cardiac pumping capacity at the in vivo contraction frequency, indicating that bullfrog tadpoles were able to perform cardiac mechanistic adjustments to face Roundup-exposure. However, the lower maximal in vitro contraction frequency of the R-group could limit its in vivo cardiac performance, when the adrenergic-stimulation is present. The association between the high energetic cost to counteract the harmful effects of this herbicide and the induction of oxidative stress suggest that low and realistic concentrations of Roundup can have an impact on tadpoles' performance and success, jeopardizing their survival and/or population establishment.
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Affiliation(s)
- Monica J Costa
- Campus of Sorocaba, Federal University of São Carlos, Avenida Darci Carvalho Dafferner 200, Sorocaba, SP, 18043-970, Brazil.
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