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Li H, Zhong Q, Wang M, Luo F, Wang X, Zhou L, Zhang X. Residue degradation, transfer and risk assessment of pyriproxyfen and its metabolites from tea garden to cup by ultra performance liquid chromatography tandem mass spectrometry. JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE 2022; 102:3983-3993. [PMID: 34994973 DOI: 10.1002/jsfa.11746] [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: 12/10/2021] [Revised: 12/26/2021] [Accepted: 01/07/2022] [Indexed: 06/14/2023]
Abstract
BACKGROUND Tea is one of the most popular drinks in the world. The growth of tea plant is inseparable from the control of pesticides on diseases and pests. Pyriproxyfen is used as a pesticide substitute to control insect pests in tea gardens, but little is known about its residue degradation. Here, we performed an integrative study of the degradation and metabolism of pyriproxyfen from the tea garden to the cup. RESULTS The dissipation half-life of pyriproxyfen during tea growth was 2.74 days, and five metabolites PYPAC, PYPA, DPH-Pyr, 5''-OH-Pyr, and 4'-OH-Pyr were generated. The total processing factors for pyriproxyfen in green tea and black tea were 2.41-2.83 and 2.77-3.70, respectively. The residues of pyriproxyfen and its metabolites were affected by different processing steps. The total leaching rates of pyriproxyfen from green tea and black tea into their infusions were 9.8-12.3% and 5.3-13.8%, respectively. The leaching rates of the five metabolites were higher than that of pyriproxyfen and increased the intake risk. CONCLUSION To ensure safe consumption, the recommended maximum residue limit value of pyriproxyfen in tea can be set to 5 mg kg-1 and the pre-harvest interval can be set to 5 days. © 2022 Society of Chemical Industry.
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Affiliation(s)
- Hongxia Li
- Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, China
- Graduate School of Chinese Academy of Agricultural Sciences, Beijing, China
| | - Qing Zhong
- Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, China
- Graduate School of Chinese Academy of Agricultural Sciences, Beijing, China
| | - Min Wang
- Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, China
- College of Horticulture and Landscape, Tianjin Agricultural University, Tianjin, China
| | - Fengjian Luo
- Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, China
| | - Xinru Wang
- Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, China
| | - Li Zhou
- Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, China
| | - Xinzhong Zhang
- Tea Research Institute, Chinese Academy of Agricultural Sciences, Hangzhou, China
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Luckmann MR, de Melo MS, Spricigo MC, da Silva NM, Nazari EM. Pyriproxyfen exposure induces DNA damage, cell proliferation impairments and apoptosis in the brain vesicles layers of chicken embryos. Toxicology 2021; 464:152998. [PMID: 34695508 DOI: 10.1016/j.tox.2021.152998] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 09/30/2021] [Accepted: 10/19/2021] [Indexed: 11/16/2022]
Abstract
Larvicide pyriproxyfen (PPF), used in drinking water reservoirs to control Aedes mosquitoes, has already been shown as a possible cause of congenital anomalies in the central nervous system. However, the neurotoxic effects of PPF on the development of vertebrate embryos are still underexplored. Thus, the aim of this study was to investigate the effects of PPF on the morphometric parameters of the head and brain, as well as on the cell layers of the forebrain and midbrain, using embryos of Gallus domesticus as a model. Two sublethal PPF concentrations (0.01 mg/L and 10 mg/L), as defined by a survival curve, were tested. Analysis of the biometry of embryos showed significant reduction in body and brain mass and also in measurements of the head and brain. A reduction in cell layer thickness of the forebrain and midbrain was observed, accompanied by a reduction in the numerical density of cells per area. Changes in brain and head sizes and in the thickness of the cell layers of the forebrain and midbrain were significant at 10 mg/L PPF. Notably, PPF caused DNA doublestrand breaks and induced apoptosis in embryos exposed to 10 mg/L, which were accompanied by a reduction in cell proliferation. Regarding neuronal and glial differentiation, no changes were observed in the number of neurons and glial cells on the analyzed layers. Furthermore, PPF did not impact the head ossification process. These findings reveal that PPF is a strong stressor for neurodevelopment, causing damage to the cell architecture of brain vesicles.
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Affiliation(s)
- Maico Roberto Luckmann
- Departamento de Biologia Celular, Embriologia e Genética, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, Brazil.
| | - Madson Silveira de Melo
- Departamento de Biologia Celular, Embriologia e Genética, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, Brazil.
| | - Mirian Celene Spricigo
- Departamento de Biologia Celular, Embriologia e Genética, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, Brazil.
| | - Norma Machado da Silva
- Departamento de Biologia Celular, Embriologia e Genética, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, Brazil.
| | - Evelise Maria Nazari
- Departamento de Biologia Celular, Embriologia e Genética, Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, Brazil.
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Maharajan K, Muthulakshmi S, Karthik C, Nataraj B, Nambirajan K, Hemalatha D, Jiji S, Kadirvelu K, Liu KC, Ramesh M. Pyriproxyfen induced impairment of reproductive endocrine homeostasis and gonadal histopathology in zebrafish (Danio rerio) by altered expression of hypothalamus-pituitary-gonadal (HPG) axis genes. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 735:139496. [PMID: 32480152 DOI: 10.1016/j.scitotenv.2020.139496] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 05/13/2020] [Accepted: 05/15/2020] [Indexed: 06/11/2023]
Abstract
Pyriproxyfen (PPF), a broad-spectrum insecticide known to cause reproductive and endocrine disruption in invertebrates, while the data is scarce in aquatic vertebrates. The goal of this study is to investigate the impact of PPF on reproductive endocrine system of male and female zebrafish along hypothalamus-pituitary-gonadal (HPG) axis. In brain, PPF caused significant alteration in the transcripts of erα, lhβ, and cyp19b genes in male and fshβ, lhβ, and cyp19b genes in female zebrafish. The downstream genes of steroidogenic pathway like, star, 3βhsd, 17βhsd, and cyp19a expression were significantly altered in gonad of both sexes. Subsequent changes in circulatory steroid hormone levels lead to imbalance in hormone homeostasis as revealed from estradiol/testosterone (E2/T) ratio. Further, the vitellogenin transcript level was enhanced in hepatic tissues and their blood plasma content was increased in male (16.21%) and declined in female (21.69%). PPF also induced histopathological changes in gonads such as, reduction of mature spermatocytes in male and vitellogenic oocytes in female zebrafish. The altered E2/T ratio and gonadal histopathology were supported by the altered transcript levels of HPG axis genes. Overall, these findings provide new insights of PPF in zebrafish reproductive system and highlights for further investigations on its potential risks in aquatic environment.
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Affiliation(s)
- Kannan Maharajan
- DRDO-BU Center for Life Sciences, Bharathiar University Campus, Coimbatore 641046, India; Unit of Toxicology, Department of Zoology, Bharathiar University, Coimbatore 641046, India; Biology Institute, Qilu University of Technology (Shandong Academy of Sciences), 28789 Jingshidong Road, Licheng District, Jinan 250103, China
| | - Sellamani Muthulakshmi
- DRDO-BU Center for Life Sciences, Bharathiar University Campus, Coimbatore 641046, India
| | - Chinnannan Karthik
- DRDO-BU Center for Life Sciences, Bharathiar University Campus, Coimbatore 641046, India
| | - Bojan Nataraj
- Unit of Toxicology, Department of Zoology, Bharathiar University, Coimbatore 641046, India
| | - Kanthan Nambirajan
- Division of Ecotoxicology, Sálim Ali Centre for Ornithology and Natural History, Coimbatore 641108, India
| | - Devan Hemalatha
- Department of Zoology, PSG College of Arts & Science, Coimbatore 641014, India
| | - Swaminathan Jiji
- DRDO-BU Center for Life Sciences, Bharathiar University Campus, Coimbatore 641046, India
| | - Krishna Kadirvelu
- DRDO-BU Center for Life Sciences, Bharathiar University Campus, Coimbatore 641046, India
| | - Ke-Chun Liu
- Biology Institute, Qilu University of Technology (Shandong Academy of Sciences), 28789 Jingshidong Road, Licheng District, Jinan 250103, China
| | - Mathan Ramesh
- Unit of Toxicology, Department of Zoology, Bharathiar University, Coimbatore 641046, India.
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Gusso D, Reolon GK, Gonzalez JB, Altenhofen S, Kist LW, Bogo MR, Bonan CD. Pyriproxyfen Exposure Impairs Cognitive Parameters and Alters Cortisol Levels in Zebrafish. Front Behav Neurosci 2020; 14:103. [PMID: 32625070 PMCID: PMC7313640 DOI: 10.3389/fnbeh.2020.00103] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/27/2020] [Accepted: 05/25/2020] [Indexed: 12/27/2022] Open
Abstract
Pyriproxyfen is one of the most used larvicides and insecticides; it acts as an analog of juvenile insect hormone (a growth regulator). It is highly toxic during all stages of mosquito development, suppresses metamorphosis, and interferes in insect reproduction and proliferation. Pyriproxyfen and its main metabolite have been shown to affect brain development in rodents. This compound is employed mainly to eliminate outbreaks of the genus Aedes, even in potable water. Despite the increasing number of toxicological studies about larvicides and insecticides-with an indication of continuous use-there have been few studies about the effects of pyriproxyfen in non-target species such as fish. This study evaluated the effects of pyriproxyfen on behavioral, cognitive, and endocrine parameters in zebrafish. We exposed adult zebrafish to different pyriproxyfen (Pestanal®) concentrations (0.125, 0.675, and 1.75 mg/l) for 96 h. We analyzed behavioral parameters, memory, cortisol levels, and gene expression of glucocorticoid receptor (gr) and corticotrophin-releasing factor (crf) after pyriproxyfen exposure. This exposure did not alter locomotion (distance or mean speed), anxiety-like behavior (latency to enter to the top zone of the tank or time in the top zone of the tank), and social or aggressive behavior. However, there was impaired inhibitory avoidance memory at all tested pyriproxyfen concentrations. Cortisol levels were reduced in exposed groups when compared to control or vehicle. However, gr and crf gene expression in pyriproxyfen-treated animals were unaltered when compared to control or vehicle groups. Taken together, these findings indicate that pyriproxyfen may induce cognitive impairment and altered cortisol levels in zebrafish, a non-target species.
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Affiliation(s)
- Darlan Gusso
- Programa de Pos-Graduacao em Biologia Celular e Molecular, Escola de Ciencias da Saude e da Vida, Pontificia Universidade Catolica do Rio Grande do Sul, Porto Alegre, Brazil
| | - Gustavo Kellermann Reolon
- Programa de Pos-Graduacao em Biologia Celular e Molecular, Escola de Ciencias da Saude e da Vida, Pontificia Universidade Catolica do Rio Grande do Sul, Porto Alegre, Brazil
| | - Jonas Brum Gonzalez
- Programa de Pos-Graduacao em Biologia Celular e Molecular, Escola de Ciencias da Saude e da Vida, Pontificia Universidade Catolica do Rio Grande do Sul, Porto Alegre, Brazil
| | - Stefani Altenhofen
- Programa de Pos-Graduacao em Medicina e Ciencias da Saude, Escola de Medicina, Pontificia Universidade Catolica do Rio Grande do Sul, Porto Alegre, Brazil
| | - Luiza Wilges Kist
- Programa de Pos-Graduacao em Biologia Celular e Molecular, Escola de Ciencias da Saude e da Vida, Pontificia Universidade Catolica do Rio Grande do Sul, Porto Alegre, Brazil
| | - Mauricio Reis Bogo
- Programa de Pos-Graduacao em Biologia Celular e Molecular, Escola de Ciencias da Saude e da Vida, Pontificia Universidade Catolica do Rio Grande do Sul, Porto Alegre, Brazil
- Programa de Pos-Graduacao em Medicina e Ciencias da Saude, Escola de Medicina, Pontificia Universidade Catolica do Rio Grande do Sul, Porto Alegre, Brazil
| | - Carla Denise Bonan
- Programa de Pos-Graduacao em Biologia Celular e Molecular, Escola de Ciencias da Saude e da Vida, Pontificia Universidade Catolica do Rio Grande do Sul, Porto Alegre, Brazil
- Programa de Pos-Graduacao em Medicina e Ciencias da Saude, Escola de Medicina, Pontificia Universidade Catolica do Rio Grande do Sul, Porto Alegre, Brazil
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Liu H, Li P, Wang P, Liu D, Zhou Z. Toxicity risk assessment of pyriproxyfen and metabolites in the rat liver: A vitro study. JOURNAL OF HAZARDOUS MATERIALS 2020; 389:121835. [PMID: 31843398 DOI: 10.1016/j.jhazmat.2019.121835] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2019] [Revised: 11/09/2019] [Accepted: 12/04/2019] [Indexed: 06/10/2023]
Abstract
Pyriproxyfen (PYR) is a type of aromatic juvenile hormone analog and a hygienic insecticide used in agriculture to control insect species. Therefore, assessing the metabolic behavior and toxic effects of PYR in mammals is the best means of evaluating its risks to human health. Previous studies have reported conflicting results regarding the toxicity risks of PYR and its metabolites in rat hepatocytes. We used ultra-performance liquid chromatography-tandem mass spectrometry (UPLC-MS/MS) to perform a chiral analysis of PYR and its metabolites investigating the enantioselective metabolism of PYR in rat liver microsomes. Our results concluded that the recoveries of PYR, metabolites A and B ranged from 81.13%-111.54 %, with RSD values of 0.01 %-6.52 %. The method limits of detection (LODs) and limits of quantification (LOQs) for PYR, metabolites A and B were in accordance with the analysis requirements. Previous studies have demonstrated the enantioselective metabolism of PYR and the generation of metabolites. Measurements of cell proliferation toxicity to rat hepatocytes, apoptosis and DNA damage induced by PYR and its metabolites in rat hepatocytes indicated that the metabolites reflected higher toxicity potential than PYR in rat hepatocytes. More studies about the molecular mechanism of PYR-induced toxicity are urgently needed in future work.
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Affiliation(s)
- Hui Liu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Department of Applied Chemistry, China Agricultural University, Yuanmingyuan West Road 2, Beijing 100193, China
| | - Peize Li
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Department of Applied Chemistry, China Agricultural University, Yuanmingyuan West Road 2, Beijing 100193, China
| | - Peng Wang
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Department of Applied Chemistry, China Agricultural University, Yuanmingyuan West Road 2, Beijing 100193, China
| | - Donghui Liu
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Department of Applied Chemistry, China Agricultural University, Yuanmingyuan West Road 2, Beijing 100193, China.
| | - Zhiqiang Zhou
- Beijing Advanced Innovation Center for Food Nutrition and Human Health, Department of Applied Chemistry, China Agricultural University, Yuanmingyuan West Road 2, Beijing 100193, China
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