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Docea AO, Cirstea AE, Cercelaru L, Drocas AI, Dinca V, Mesnage R, Marginean C, Radu A, Popa DG, Rogoveanu O, Mitrut R, Antoniou MN, Tsatsakis A, Hernández AF, Calina D. Effect of perinatal exposure to glyphosate and its mixture with 2,4-D and dicamba on rat dam kidney and thyroid function and offspring's health. ENVIRONMENTAL RESEARCH 2023; 237:116908. [PMID: 37597833 DOI: 10.1016/j.envres.2023.116908] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Revised: 08/15/2023] [Accepted: 08/16/2023] [Indexed: 08/21/2023]
Abstract
The increasing use of the herbicide mixture of glyphosate, dicamba and 2-4-D to deal with glyphosate-resistant weeds raises concerns regarding human health and environmental risks. This study aimed to evaluate the effects of developmental exposure to glyphosate and a herbicide mixture containing glyphosate, dicamba and 2-4-D on rat dams' kidney and thyroid function and offspring's health. Pregnant Wistar rats were exposed from day-6 of gestation till weaning to regulatory relevant doses of glyphosate corresponding to the European Union (EU) acceptable daily intake (ADI; 0.5 mg/kg bw/day), and the no-observed-adverse-effect level (NOAEL; 50 mg/kg bw/day), and to a mixture of glyphosate, dicamba and 2,4-D all at the EU ADI (0.5, 0.002 and 0.3 mg/kg bw/day) respectively. After weaning the dams were sacrificed and blood and organs were collected. The pups' health was assessed by measuring viability, gestational and anogenital indices. Perinatal exposure to GLY alone and the herbicide mixture resulted in anti-androgenic effects in male offspring. In dams, exposure to glyphosate resulted in kidney glomerular and tubular dysfunction as well as increased thyroid hormone levels in a dose-dependent manner. Furthermore, exposure to the herbicide mixture resulted in effects similar to those observed with glyphosate at the NOAEL, suggesting at least an additive effect of the herbicide mixture at doses individually considered safe for humans.
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Affiliation(s)
- Anca Oana Docea
- Department of Toxicology, University of Medicine and Pharmacy of Craiova, Craiova, Romania.
| | - Andrei Eugen Cirstea
- Doctoral School, University of Medicine and Pharmacy of Craiova, Craiova, Romania.
| | - Liliana Cercelaru
- Department of Anatomy and Embryology, University of Medicine and Pharmacy of Craiova, 200349, Craiova, Romania
| | - Andrei Ioan Drocas
- Department of Urology, University of Medicine and Pharmacy of Craiova, 200349, Craiova, Romania
| | - Viorica Dinca
- Doctoral School, University of Medicine and Pharmacy of Craiova, Craiova, Romania
| | - Robin Mesnage
- King's College London, Gene Expression and Therapy Group, Department of Medical and Molecular Genetics, Faculty of Life Sciences and Medicine, Guy's Hospital, London, SE1 9RT, UK
| | - Cristina Marginean
- Department of Internal Medicine, University of Medicine and Pharmacy of Craiova, 200349, Craiova, Romania
| | - Antonia Radu
- Department of Pharmaceutical Botany, University of Medicine and Pharmacy of Craiova, 200349, Craiova, Romania.
| | - Dragos George Popa
- Department of Plastic Surgery, University of Medicine and Pharmacy of Craiova, 200349, Craiova, Romania.
| | - Otilia Rogoveanu
- Department of Physical Medicine and Rehabilitation, University of Medicine and Pharmacy of Craiova, 200349, Craiova, Romania.
| | - Radu Mitrut
- Department of Cardiology, University and Emergency Hospital, 050098, Bucharest, Romania
| | - Michael N Antoniou
- King's College London, Gene Expression and Therapy Group, Department of Medical and Molecular Genetics, Faculty of Life Sciences and Medicine, Guy's Hospital, London, SE1 9RT, UK
| | - Aristidis Tsatsakis
- Department of Forensic Sciences and Toxicology, Faculty of Medicine, University of Crete, 71003, Heraklion, Greece
| | - Antonio F Hernández
- Department of Legal Medicine and Toxicology, University of Granada School of Medicine, Granada, Spain; Health Research Institute of Granada (ibs. GRANADA), Spain; Consortium for Biomedical Research in Epidemiology and Public Health (CIBERESP), Madrid, Spain
| | - Daniela Calina
- Department of Clinical Pharmacy, University of Medicine and Pharmacy of Craiova, Craiova, Romania
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Borgert CJ. Issue analysis: key characteristics approach for identifying endocrine disruptors. Arch Toxicol 2023; 97:2819-2822. [PMID: 37572129 PMCID: PMC10474976 DOI: 10.1007/s00204-023-03568-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Accepted: 08/02/2023] [Indexed: 08/14/2023]
Abstract
For more than a decade, weight of evidence (WoE) evaluations have been the standard method for determining whether a chemical meets the definition of an endocrine disrupting chemical (EDC). WoE methods consider all data pertinent to satisfying the EDC definition and evaluating those data with respect to relevance, reliability, strength, and coherence with established endocrine physiology and pharmacology. A new approach for identifying EDC hazards has been proposed that organizes and evaluates data according to ten so-called "Key Characteristics (KCs) of EDCs". The approach claims to address the lack of a widely accepted, systematic approach for identifying EDC hazards, but completely ignores the WoE literature for EDCs. In contrast to WoE methods, the KC approach fails to apply the consensus definition of EDC and is not amenable to empirical testing or validation, is fungible and ensures inconsistent and unreliable results, ignores principles of hormone action and characteristics of dose-response in endocrine pharmacology and toxicology, lacks a means of distinguishing endocrine-mediated from non-endocrine mediated mechanisms, lacks a means to reach a negative conclusion about a chemical's EDC properties or to distinguish EDCs from non-EDCs, and provides no means for developing a valid consensus among experts nor provides a means of resolving conflicting interpretations of data. Instead of shortcuts like the KC approach, which are prone to bias, error, and arbitrary conclusions, identifying EDCs should rely on WoE evaluations that supply the critical components and scientific rigor lacking in the proposed KCs for EDCs.
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Matthews JC. A mechanistic evaluation of the potential for octamethylcyclotetrasiloxane to produce effects via endocrine modes of action. Crit Rev Toxicol 2021; 51:571-590. [PMID: 34877914 DOI: 10.1080/10408444.2021.1994525] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Abstract
This review is a hypothesis driven, mechanistic evaluation of the potential for octamethylcyclotetrasiloxane (D4) to produce any effects via endocrine modes of action. D4 is a volatile, lipophilic liquid used in the production of high molecular weight dimethylsiloxane polymers. These are used in a variety of industrial, medical, cleaning, and personal care products, and they may contain low levels of residual D4. Low concentrations of D4 are found in the environment and there is potential for low level human exposure. All of the measured environmental and workplace levels of D4 fall below no observed effect levels (NOEL). Most of the effects of high dose D4 involve the female reproductive system. In the mature intact female rat following chronic high dose exposure, D4 may cause inhibition of mating and ovulation, decreased live litter sizes, small increases in the estrogen to progesterone ratio primarily through decreases in progesterone, and increases in uterine hyperplasia. When endogenous estrogens are very low, high dose D4 causes increases in some uterine parameters. To assess whether these high dose effects can be attributed to an endocrine mode of action, endpoints are ranked for relevance and strength, consistent with published concepts. When sufficient information is available the level of activity of D4 for producing the observed effect is compared with that of potent endocrines. The conclusions reached are that all of the effects of D4 fall well short of any established criteria for D4 to be capable of producing any adverse effect via an endocrine mode of action.
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Affiliation(s)
- John C Matthews
- Department of Biomolecular Sciences, University of Mississippi School of Pharmacy, University, MS, USA
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Hernández AF, Bennekou SH, Hart A, Mohimont L, Wolterink G. Mechanisms underlying disruptive effects of pesticides on the thyroid function. CURRENT OPINION IN TOXICOLOGY 2020. [DOI: 10.1016/j.cotox.2019.10.003] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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Crivellente F, Hart A, Hernandez-Jerez AF, Hougaard Bennekou S, Pedersen R, Terron A, Wolterink G, Mohimont L. Establishment of cumulative assessment groups of pesticides for their effects on the thyroid. EFSA J 2019; 17:e05801. [PMID: 32626429 PMCID: PMC7009157 DOI: 10.2903/j.efsa.2019.5801] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023] Open
Abstract
Cumulative assessment groups of pesticides have been established for two specific effects on the thyroid: firstly hypothyroidism, and secondly parafollicular cell (C-cell) hypertrophy, hyperplasia and neoplasia. Sources of uncertainties resulting from the methodological approach and from the limitations in available data and scientific knowledge have been identified and considered. This report supports the publication of a scientific report on cumulative risk assessment to pesticides affecting the thyroid, in which all uncertainties identified for either the exposure assessment or the establishment of the cumulative assessment groups are incorporated into a consolidated risk characterisation.
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Spirhanzlova P, Fini JB, Demeneix B, Lardy-Fontan S, Vaslin-Reimann S, Lalere B, Guma N, Tindall A, Krief S. Composition and endocrine effects of water collected in the Kibale national park in Uganda. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2019; 251:460-468. [PMID: 31103006 DOI: 10.1016/j.envpol.2019.05.006] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/18/2019] [Revised: 04/14/2019] [Accepted: 05/01/2019] [Indexed: 06/09/2023]
Abstract
Pesticides are used worldwide with potential harmful effects on both fauna and flora. The Kibale National Park in Uganda, a site renowned for its biodiversity is surrounded by tea, banana and eucalyptus plantations as well as maize fields and small farms. We previously showed presence of pesticides with potential endocrine disruptive effects in the vicinity. To further investigate the water pollution linked to agricultural pressure in this protected area, we implemented a complementary monitoring strategy based on: analytical chemistry, effects based methods and the deployment of Polar Organic Chemical Integrative Samplers (POCIS). Chemical analysis of the POCIS extracts revealed the presence of 13 pesticides: carbofuran, DEET, 2.4-D amine, carbaryl, ametryn, isoproturon, metolachlor, terbutryn, dimethoate, imidacloprid, picaridin, thiamethoxam, carbendazim, with the first three being present in the largest quantities. Water samples collected at the POCIS sampling sites exhibited thyroid and estrogen axis disrupting activities in vivo, in addition to developmental and behaviour effects on Xenopus laevis tadpoles model. Based on our observations, for the health of local human and wildlife populations, further monitoring as well as actions to reduce agrochemical use should be considered in the Kibale National Park and in regions exposed to similar conditions.
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Affiliation(s)
- Petra Spirhanzlova
- UMR 7221 Evolution of Endocrine Regulations, Museum National D'Histoire Naturelle, 7 Rue Cuvier, 75005, Paris, France.
| | - Jean-Baptiste Fini
- UMR 7221 Evolution of Endocrine Regulations, Museum National D'Histoire Naturelle, 7 Rue Cuvier, 75005, Paris, France
| | - Barbara Demeneix
- UMR 7221 Evolution of Endocrine Regulations, Museum National D'Histoire Naturelle, 7 Rue Cuvier, 75005, Paris, France
| | - Sophie Lardy-Fontan
- Laboratoire de Métrologie et D'Essais, 1, Rue Gaston Boissier, 75724, Paris Cedex 15, France
| | - Sophie Vaslin-Reimann
- Laboratoire de Métrologie et D'Essais, 1, Rue Gaston Boissier, 75724, Paris Cedex 15, France
| | - Béatrice Lalere
- Laboratoire de Métrologie et D'Essais, 1, Rue Gaston Boissier, 75724, Paris Cedex 15, France
| | | | | | - Sabrina Krief
- UMR 7206 CNRS/MNHN/P7, Eco-anthropologie et D'ethnobiologie, Hommes et Environnements, Muséum National D'Histoire Naturelle, Musée de L'Homme, 17 Place Du Trocadéro, 75016, Paris, France; Great Ape Conservation Project (GACP), Sebitoli Research Station, Kibale National Park, Fort Portal, Uganda
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Gelbke HP, Banton M, Block C, Dawkins G, Leibold E, Pemberton M, Sakoda A, Yasukawa A. Oligomers of styrene are not endocrine disruptors. Crit Rev Toxicol 2018; 48:471-499. [DOI: 10.1080/10408444.2018.1447547] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
| | | | | | - Gordon Dawkins
- INEOS Styrolution Group GmbH, Frankfurt am Main, Germany
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Borgert CJ, Matthews JC, Baker SP. Human-relevant potency threshold (HRPT) for ERα agonism. Arch Toxicol 2018; 92:1685-1702. [PMID: 29632997 PMCID: PMC5962616 DOI: 10.1007/s00204-018-2186-z] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2017] [Accepted: 03/13/2018] [Indexed: 11/30/2022]
Abstract
The European Commission has recently proposed draft criteria for the identification of endocrine disrupting chemicals (EDCs) that pose a significant hazard to humans or the environment. Identifying and characterizing toxic hazards based on the manner by which adverse effects are produced rather than on the nature of those adverse effects departs from traditional practice and requires a proper interpretation of the evidence regarding the chemical’s ability to produce physiological effect(s) via a specific mode of action (MoA). The ability of any chemical to produce a physiological effect depends on its pharmacokinetics and the potency by which it acts via the various MoAs that can lead to the particular effect. A chemical’s potency for a specific MoA—its mechanistic potency—is determined by two properties: (1) its affinity for the functional components that comprise the MoA, i.e., its specific receptors, enzymes, transporters, transcriptional elements, etc., and (2) its ability to alter the functional state of those components (activity). Using the agonist MoA via estrogen receptor alpha, we illustrate an empirical method for determining a human-relevant potency threshold (HRPT), defined as the minimum level of mechanistic potency necessary for a chemical to be able to act via a particular MoA in humans. One important use for an HRPT is to distinguish between chemicals that may be capable of, versus those likely to be incapable of, producing adverse effects in humans via the specified MoA. The method involves comparing chemicals that have different ERα agonist potencies with the ability of those chemicals to produce ERα-mediated agonist responses in human clinical trials. Based on this approach, we propose an HRPT for ERα agonism of 1E-04 relative to the potency of the endogenous estrogenic hormone 17β-estradiol or the pharmaceutical estrogen, 17α-ethinylestradiol. This approach provides a practical way to address Hazard Identification according to the draft criteria for identification of EDCs recently proposed by the European Commission.
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Affiliation(s)
- Christopher J Borgert
- Applied Pharmacology and Toxicology, Inc. and CEHT, Univ. FL College of Vet. Med., Gainesville, FL, USA.
| | - John C Matthews
- University of Mississippi School of Pharmacy, University, MS, USA
| | - Stephen P Baker
- Department of Pharmacology and Therapeutics, University of Florida College of Medicine, Gainesville, FL, USA
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