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Pascuali N, Pu Y, Waye AA, Pearl S, Martin D, Sutton A, Shikanov A, Veiga-Lopez A. Evaluation of Lipids and Lipid-Related Transcripts in Human and Ovine Theca Cells and an in Vitro Mouse Model Exposed to the Obesogen Chemical Tributyltin. ENVIRONMENTAL HEALTH PERSPECTIVES 2024; 132:47009. [PMID: 38630605 PMCID: PMC11023052 DOI: 10.1289/ehp13955] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 02/22/2024] [Accepted: 03/18/2024] [Indexed: 04/19/2024]
Abstract
BACKGROUND Exposure to obesogenic chemicals has been reported to result in enhanced adipogenesis, higher adipose tissue accumulation, and reduced ovarian hormonal synthesis and follicular function. We have reported that organotins [tributyltin (TBT) and triphenyltin (TPT)] dysregulate cholesterol trafficking in ovarian theca cells, but, whether organotins also exert lipogenic effects on ovarian cells remains unexplored. OBJECTIVE We investigated if environmentally relevant exposures to organotins [TBT, TPT, or dibutyltin (DBT)] induce lipid dysregulation in ovarian theca cells and the role of the liver X receptor (LXR) in this effect. We also tested the effect of TBT on oocyte maturation and neutral lipid accumulation, and lipid-related transcript expression in cumulus cells and preimplantation embryos. METHODS Primary theca cell cultures derived from human and ovine ovaries were exposed to TBT, TPT, or DBT (1, 10, or 50 ng / ml ). The effect of these chemical exposures on neutral lipid accumulation, lipid abundance and composition, lipid homeostasis-related gene expression, and cytokine secretion was evaluated using liquid chromatography-mass spectrometry (LC-MS), inhibitor-based methods, cytokine secretion, and lipid ontology analyses. We also exposed murine cumulus-oocyte complexes to TBT and evaluated oocyte maturation, embryo development, and lipid homeostasis-related mRNA expression in cumulus cells and blastocysts. RESULTS Exposure to TBT resulted in higher intracellular neutral lipids in human and ovine primary theca cells. In ovine theca cells, this effect was dose-dependent, independent of cell stage, and partially mediated by LXR. DBT and TPT resulted in higher intracellular neutral lipids but to a lesser extent in comparison with TBT. More than 140 lipids and 9 cytokines were dysregulated in TBT-exposed human theca cells. Expression of genes involved in lipogenesis and fatty acid synthesis were higher in theca cells, as well as in cumulus cells and blastocysts exposed to TBT. However, TBT did not impact the rates of oocyte maturation or blastocyst development. DISCUSSION TBT induced dyslipidemia in primary human and ovine theca cells, which may be responsible for some of the TBT-induced fertility dysregulations reported in rodent models of TBT exposure. https://doi.org/10.1289/EHP13955.
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Affiliation(s)
- Natalia Pascuali
- Department of Pathology, University of Illinois Chicago, Chicago, Illinois, USA
| | - Yong Pu
- Department of Pathology, University of Illinois Chicago, Chicago, Illinois, USA
| | - Anita A. Waye
- Department of Pathology, University of Illinois Chicago, Chicago, Illinois, USA
| | - Sarah Pearl
- Department of Obstetrics and Gynecology, Sparrow Health System, Lansing, Michigan, USA
| | - Denny Martin
- Department of Obstetrics and Gynecology, Sparrow Health System, Lansing, Michigan, USA
| | - Allison Sutton
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, USA
| | - Ariella Shikanov
- Department of Biomedical Engineering, University of Michigan, Ann Arbor, Michigan, USA
| | - Almudena Veiga-Lopez
- Department of Pathology, University of Illinois Chicago, Chicago, Illinois, USA
- The Chicago Center for Health and Environment, University of Illinois Chicago, Chicago, Illinois, USA
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2
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Liang W, Fu L, Feng M, Wang X, Yun Z, Xu J. Endoplasmic Reticulum Stress and Autophagy Are Involved in Hepatotoxicity Induced by Tributyltin. TOXICS 2023; 11:607. [PMID: 37505572 PMCID: PMC10386594 DOI: 10.3390/toxics11070607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Revised: 07/08/2023] [Accepted: 07/10/2023] [Indexed: 07/29/2023]
Abstract
Tributyltin (TBT), a common contaminant in aquatic ecosystems, has severe toxic effects on multiple tissues and organs, especially the liver. Previous toxicogenomic analysis has indicated that the main mechanism of TBT-induced hepatotoxicity is related to the activation of the apoptotic pathway. However, the mechanism of action occurring before the activation of apoptosis is still unclear. Herein, we applied proteomic technology to explore the protein expression profile of TBT-treated HL7702 normal human liver cells. The ultrastructural changes in cells were observed by transmission electron microscopy. After low dose (2 μΜ) TBT treatment, activation of the unfolded protein response and endoplasmic reticulum stress were observed; the expression levels of PERK, ATF6, BiP, and CHOP were significantly elevated, and splicing of XBP1 mRNA was initiated. When the TBT concentration increased to 4 μΜ, the protein levels of Beclin1, Atg3, Atg5, Atg7, and Atg12-Atg5 were significantly elevated, and the protein level of LC3Ⅰ decreased while that of LC3Ⅱ increased, suggesting the activation of autophagy. As the TBT concentration continued to increase, autophagy could not eliminate the damage, and apoptosis eventually occurred. These results indicate novel pathways of hepatotoxicity induced by TBT and provide insights for future studies.
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Affiliation(s)
- Weiqi Liang
- School of Public Health, Health Science Center, Ningbo University, Ningbo 315211, China
| | - Lingling Fu
- School of Public Health, Health Science Center, Ningbo University, Ningbo 315211, China
| | - Mei Feng
- School of Public Health, Health Science Center, Ningbo University, Ningbo 315211, China
| | - Xiaorong Wang
- School of Public Health, Health Science Center, Ningbo University, Ningbo 315211, China
| | - Zhaohui Yun
- School of Public Health, Health Science Center, Ningbo University, Ningbo 315211, China
| | - Jin Xu
- School of Public Health, Health Science Center, Ningbo University, Ningbo 315211, China
- Zhejiang Key Laboratory of Pathophysiology, Health Science Center, Ningbo University, Ningbo 315211, China
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3
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Merlo E, Zimerman J, Dos Santos FCF, Zanol JF, da Costa CS, Carneiro PH, Miranda-Alves L, Warner GR, Graceli JB. Subacute and low dose of tributyltin exposure leads to brown adipose abnormalities in male rats. Toxicol Lett 2023; 376:26-38. [PMID: 36638932 PMCID: PMC9928871 DOI: 10.1016/j.toxlet.2023.01.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2022] [Revised: 01/07/2023] [Accepted: 01/09/2023] [Indexed: 01/12/2023]
Abstract
Tributyltin (TBT) is an obesogenic endocrine disrupting chemical (EDC) linked with several metabolic complications. Brown adipose tissue (BAT) is the principal site for thermogenesis, making it a potential target for obesity management and metabolic disease. However, few studies have evaluated TBT effect on BAT function. In this investigation, we assessed whether subacute (15 days) and low dose of TBT exposure (100 ng/kg/day) results in abnormal BAT morphophysiology in adult male rats. Body temperature, BAT morphology, inflammation, oxidative stress, collagen deposition and BAT metabolic gene expression markers were assessed in room temperature (Room, ∼24 ºC) and after cold tolerance test (Cold, ∼4 ºC) conditions. A reduction in body temperature was observed in both Room and Cold conditions in TBT rats, suggesting abnormal BAT thermogenic function. Changes in BAT morphology were observed in TBT rats, with an increase in BAT lipid accumulation, an increase in BAT unilocular adipocyte number and a decrease in BAT multilocular adipocyte number in Room condition. All these parameters were opposite in Cold condition TBT rats, leading to a borderline increase in BAT UCP1 protein expression. An increase in BAT mast cell number was observed in TBT rats in Room condition. An increase in ED1 protein expression (macrophage marker) was observed in TBT rats in Cold condition. Oxidative stress and collagen deposition increased in both Room and Cold conditions in TBT rats. TBT exposure caused a borderline increase in BAT COL1A1 protein expression in Cold condition. Further, strong negative correlations were observed between body temperature and BAT lipid accumulation, and BAT lipid accumulation and multilocular adipocyte number. Thus, these data suggest that TBT exposure impaired BAT morphophysiology through impacts on lipid accumulation, inflammation, fibrosis and oxidative stress in male rats.
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Affiliation(s)
- Eduardo Merlo
- Department of Morphology, Federal University of Espírito Santo, Vitória, Brazil
| | - Jeanini Zimerman
- Department of Morphology, Federal University of Espírito Santo, Vitória, Brazil
| | | | - Jordana F Zanol
- Department of Morphology, Federal University of Espírito Santo, Vitória, Brazil
| | - Charles S da Costa
- Department of Morphology, Federal University of Espírito Santo, Vitória, Brazil
| | - Pedro H Carneiro
- Experimental Endocrinology Research, Development and Innovation Group, Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Brazil; Postgraduate Program in Endocrinology, School of Medicine, Federal University of Rio de Janeiro, Av. Carlos Chagas Filho, Ilha do Governador, Cidade Universitária, UFRJ, RJ, Brazil
| | - Leandro Miranda-Alves
- Experimental Endocrinology Research, Development and Innovation Group, Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Brazil; Postgraduate Program in Endocrinology, School of Medicine, Federal University of Rio de Janeiro, Av. Carlos Chagas Filho, Ilha do Governador, Cidade Universitária, UFRJ, RJ, Brazil
| | - Genoa R Warner
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, USA
| | - Jones B Graceli
- Department of Morphology, Federal University of Espírito Santo, Vitória, Brazil.
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Andrade MN, Melo-Paiva FD, Teixeira MP, Lima-Junior NCD, Soares P, Graceli JB, Carvalho DPD, Morris EAR, Ferreira ACF, Miranda-Alves L. Environmentally relevant dose of the endocrine disruptor tributyltin disturbs redox balance in female thyroid gland. Mol Cell Endocrinol 2022; 553:111689. [PMID: 35690288 DOI: 10.1016/j.mce.2022.111689] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/04/2022] [Revised: 05/26/2022] [Accepted: 05/30/2022] [Indexed: 10/18/2022]
Abstract
Tributyltin (TBT) is an endocrine disruptor used as a biocide in nautical paints. Even though many TBT effects in marine species are known, data in mammals are scarce, especially regarding the thyroid gland. The present study aimed to evaluate the effect of a subchronic exposure to TBT on thyroid oxidative stress of female Wistar rats. Rats received vehicle (control group), 200 or 1000 ng TBT/kg body weight/day for 40 days. After euthanasia, one part of the thyroids were collected in order to assess iodide uptake; activity and/or mRNA expression of thyroperoxidase (TPO) and dual oxidases (DUOXs); activity and/or mRNA expression of catalase, glutathione peroxidase, superoxide dismutase and NADPH oxidase 4 (CAT, GPx, SOD and NOX4); 4-hydroxynonenal (4-HNE) expression and total thiol groups levels; and mRNA expression of estrogen receptors alpha and beta (ERα and ERβ). The remaining part of the thyroid was processed for morphological analysis of estrogen receptor alpha (ERα) and for collagen deposition. Iodide uptake was not changed with treatments. TPO activity and expression were increased in the TBT1000 group (259.81% and 95.17%). The activity, but not mRNA, of CAT (17.36% TBT200; 27.10% TBT1000) and GPx (29.24% TBT200; 28.97% TBT1000) were decreased by TBT. SOD and NADPH oxidase activity, as well as thiol group and 4-HNE levels remained unchanged. Interstitial collagen deposition increased in the TBT200 group (39.54%). The mRNA expression of ERα increased in TBT-treated rats (44.87% TBT200; 36.43% TBT1000), while protein expression was increased but not reaching significance (TBT1000, p = 0.056) by TBT. Therefore, our results show that TBT increases TPO expression and reduces antioxidant enzyme activities in the thyroid gland leading to oxidative stress. Some of these effects could be mediated by the ERα pathway.
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Affiliation(s)
- Marcelle Novaes Andrade
- Laboratório de Endocrinologia Experimental-LEEx, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Farmacologia e Química Medicinal, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil
| | - Francisca Diana Melo-Paiva
- Laboratório de Endocrinologia Experimental-LEEx, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Endocrinologia, Faculdade de Medicina, Universidade Federal do Rio de Janeiro, Brazil
| | - Mariana Pires Teixeira
- Laboratório de Endocrinologia Experimental-LEEx, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Endocrinologia, Faculdade de Medicina, Universidade Federal do Rio de Janeiro, Brazil
| | - Niedson Correia de Lima-Junior
- Laboratório de Fisiologia Endócrina Doris Rosenthal, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Brazil
| | - Paula Soares
- Instituto de Investigação e Inovação em Saúde (i3S), Universidade do Porto, Porto, Portugal; Instituto de Patologia e Imunologia Molecular da Universidade do Porto (IPATIMUP), Porto, Portugal; Departamento de Patologia, Faculdade de Medicina da Universidade do Porto (FMUP), Porto, Portugal
| | - Jones Bernardes Graceli
- Laboratório de Endocrinologia e Toxicologia Celular, Departamento de Morfologia, Universidade Federal do Espírito Santo, Espírito Santo, Brazil
| | - Denise Pires de Carvalho
- Programa de Pós-graduação em Endocrinologia, Faculdade de Medicina, Universidade Federal do Rio de Janeiro, Brazil; Laboratório de Fisiologia Endócrina Doris Rosenthal, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Brazil
| | - Eduardo Andrès Rios Morris
- Laboratório de Endocrinologia Experimental-LEEx, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Endocrinologia, Faculdade de Medicina, Universidade Federal do Rio de Janeiro, Brazil
| | - Andrea Claudia Freitas Ferreira
- Programa de Pós-graduação em Endocrinologia, Faculdade de Medicina, Universidade Federal do Rio de Janeiro, Brazil; Laboratório de Fisiologia Endócrina Doris Rosenthal, Instituto de Biofísica Carlos Chagas Filho, Universidade Federal do Rio de Janeiro, Brazil; Núcleo Multidisciplinar em Pesquisa em Biologia Experimental - NUMPEX-Bio, Campus Duque de Caxias, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Leandro Miranda-Alves
- Laboratório de Endocrinologia Experimental-LEEx, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Farmacologia e Química Medicinal, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Endocrinologia, Faculdade de Medicina, Universidade Federal do Rio de Janeiro, Brazil; Programa de Pós-graduação em Ciências Morfológicas, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil.
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5
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Lu Y, Tang H, Wang X, Xu J, Sun F. Dibutyltin dichloride exposure affects mouse oocyte quality by inducing spindle defects and mitochondria dysfunction. CHEMOSPHERE 2022; 295:133959. [PMID: 35157879 DOI: 10.1016/j.chemosphere.2022.133959] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2021] [Revised: 02/10/2022] [Accepted: 02/10/2022] [Indexed: 06/14/2023]
Abstract
Dibutyltin dichloride (DBTCl) is a widespread environmental pollutant that is frequently employed as a light and heat sustainer for polyvinyl chloride (PVC) plastics and is a teratogen in vivo. Nevertheless, its destructiveness in mammalian oocytes remains unclear. This study highlighted the consequences of DBTCl vulnerability on mouse oocyte. Our results revealed that exposure to 5.0 mg/kg/day of DBTCl for ten days reduced the number of mature follicles and oocytes in the ovaries and inhibited the meiotic maturation of oocytes. Single-cell transcriptomic analysis indicated that DBTCl exposure interfered with the expression of more than 400 genes in oocytes, including those involved in multiple biological pathways. Specifically, DBTCl exposure impaired spindle assembly and chromosome alignment. In addition, DBTCl exposure caused mitochondrial dysfunction, which led to the accumulation of reactive oxygen species (ROS) and induced apoptosis. In summary, our study illustrates that mitochondrial dysfunction and redox perturbation are the major causes of the reduced quality of oocytes exposed to DBTCl.
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Affiliation(s)
- Yajuan Lu
- Institute of Reproductive Medicine, Medical School, Nantong University, Nantong, 226019, Jiangsu, China
| | - Hanyu Tang
- Institute of Reproductive Medicine, Medical School, Nantong University, Nantong, 226019, Jiangsu, China
| | - Xia Wang
- Center for Reproductive Medicine, Affiliated Hospital of Nantong University, Nantong, 226001, Jiangsu, China
| | - Junjie Xu
- Institute of Reproductive Medicine, Medical School, Nantong University, Nantong, 226019, Jiangsu, China
| | - Fei Sun
- Institute of Reproductive Medicine, Medical School, Nantong University, Nantong, 226019, Jiangsu, China.
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6
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Barbosa KL, Dettogni RS, Costa CS, Gastal EL, Raetzman LT, Flaws JA, Graceli JB. Tributyltin and the female hypothalamic-pituitary-gonadal disruption. Toxicol Sci 2021; 186:179-189. [PMID: 34850235 DOI: 10.1093/toxsci/kfab141] [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: 11/13/2022] Open
Abstract
The hypothalamic-pituitary-gonadal (HPG) axis is the principal modulator of reproductive function. Proper control of this system relies on several hormonal pathways, which make the female reproductive components susceptible to disruption by endocrine-disrupting chemicals such as tributyltin (TBT). Here, we review the relevant research on the associations between TBT exposure and dysfunction of the female HPG axis components. Specifically, TBT reduced hypothalamic gonadotropin-releasing hormone (GnRH) expression and gonadotropin release, and impaired ovarian folliculogenesis, steroidogenesis, and ovulation, at least in part, by causing abnormal sensitivity to steroid feedback mechanisms and deleterious ovarian effects. This review covers studies using environmentally relevant doses of TBT in vitro (1 ng-20 ng/mL) and in vivo (10 ng-20 mg/Kg) in mammals. The review also includes discussion of important gaps in the literature and suggests new avenue of research to evaluate the possible mechanisms underlying TBT-induced toxicity in the HPG axis. Overall, the evidence indicates that TBT exposure is associated with toxicity to the components of the female reproductive axis. Further studies are needed to better elucidate the mechanisms through which TBT impairs the ability of the HPG axis to control reproduction.
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Affiliation(s)
- Kayke L Barbosa
- Dept of Morphology, Federal University of Espirito Santo, Brazil
| | | | - Charles S Costa
- Dept of Morphology, Federal University of Espirito Santo, Brazil
| | - Eduardo L Gastal
- Animal Science, School of Agricultural Sciences, Southern Illinois University, Carbondale, IL, USA
| | - Lori T Raetzman
- Dept of Molecular and Integrative Physiology, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Jodi A Flaws
- Dept. of Comparative Biosciences, University of Illinois at Urbana-Champaign, Urbana, IL, USA
| | - Jones B Graceli
- Dept of Morphology, Federal University of Espirito Santo, Brazil
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7
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Rato L, Sousa ACA. The Impact of Endocrine-Disrupting Chemicals in Male Fertility: Focus on the Action of Obesogens. J Xenobiot 2021; 11:163-196. [PMID: 34940512 PMCID: PMC8709303 DOI: 10.3390/jox11040012] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2021] [Revised: 11/12/2021] [Accepted: 11/23/2021] [Indexed: 12/11/2022] Open
Abstract
The current scenario of male infertility is not yet fully elucidated; however, there is increasing evidence that it is associated with the widespread exposure to endocrine-disrupting chemicals (EDCs), and in particular to obesogens. These compounds interfere with hormones involved in the regulation of metabolism and are associated with weight gain, being also able to change the functioning of the male reproductive axis and, consequently, the testicular physiology and metabolism that are pivotal for spermatogenesis. The disruption of these tightly regulated metabolic pathways leads to adverse reproductive outcomes. The permanent exposure to obesogens has raised serious health concerns. Evidence suggests that obesogens are one of the leading causes of the marked decline of male fertility and key players in shaping the future health outcomes not only for those who are directly exposed but also for upcoming generations. In addition to the changes that lead to inefficient functioning of the male gametes, obesogens induce alterations that are “imprinted” on the genes of the male gametes, establishing a link between generations and contributing to the transmission of defects. Unveiling the molecular mechanisms by which obesogens induce toxicity that may end-up in epigenetic modifications is imperative. This review describes and discusses the suggested molecular targets and potential mechanisms for obesogenic–disrupting chemicals and the subsequent effects on male reproductive health.
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Affiliation(s)
- Luís Rato
- Health School of the Polytechnic Institute of Guarda, 6300-035 Guarda, Portugal
- Correspondence: (L.R.); (A.C.A.S.)
| | - Ana C. A. Sousa
- Department of Biology, School of Science and Technology, University of Évora, 7006-554 Évora, Portugal
- Comprehensive Health Research Centre (CHRC), University of Évora, 7000-671 Évora, Portugal
- Correspondence: (L.R.); (A.C.A.S.)
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Liu H, Jiang W, Ye Y, Yang B, Shen X, Lu S, Zhu J, Liu M, Yang C, Kuang H. Maternal exposure to tributyltin during early gestation increases adverse pregnancy outcomes by impairing placental development. ENVIRONMENTAL TOXICOLOGY 2021; 36:1303-1315. [PMID: 33720505 DOI: 10.1002/tox.23127] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/04/2020] [Revised: 02/23/2021] [Accepted: 03/04/2021] [Indexed: 06/12/2023]
Abstract
Tributyltin (TBT) is a persistent organotin pollutant widely used as agricultural and wood biocides, exhibiting well-documented toxicity to reproductive functions in aquatic organisms. However, the effect of TBT on early pregnancy and placental development has been rarely studied in mice. Pregnant mice were fed with 0, 0.2, and 2 mg/kg/day TBT from gravid day 1 to day 8 or 13. TBT exposure led to an increase in the number of resorbed embryo and a reduction in the weight of fetus at gestational days 13. Further study showed that TBT significantly decreased placental weight and area, lowered laminin immunoreactivity and the expressions of placental development-related molecules including Fra1, Eomes, Hand1, and Ascl2. Moreover, TBT treatment markedly inhibited the placental proliferation and induced up-regulation of p53 and cleaved caspase-3 proteins, and down-regulation of Bcl-2 protein. In addition, TBT administration increased levels of malondialdehyde and H2 O2 and decreased activities of catalase and superoxide dismutase. Collectively, these results suggested TBT-induced adverse pregnancy outcomes during early pregnancy might be involved in developmental disorders of the placenta via dysregulation of key molecules, proliferation, apoptosis, and oxidative stress.
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Affiliation(s)
- Hui Liu
- Department of Physiology, Basic Medical College, Nanchang University, Nanchang, China
| | - Wenyu Jiang
- Department of Physiology, Basic Medical College, Nanchang University, Nanchang, China
- Department of Clinic Medicine, School of Queen Mary, Nanchang University, Nanchang, China
| | - Yafen Ye
- Department of Physiology, Basic Medical College, Nanchang University, Nanchang, China
| | - Bei Yang
- Department of Physiology, Basic Medical College, Nanchang University, Nanchang, China
| | - Xin Shen
- Department of Physiology, Basic Medical College, Nanchang University, Nanchang, China
| | - Siying Lu
- Department of Physiology, Basic Medical College, Nanchang University, Nanchang, China
| | - Jun Zhu
- Department of Physiology, Basic Medical College, Nanchang University, Nanchang, China
| | - Mengling Liu
- Department of Physiology, Basic Medical College, Nanchang University, Nanchang, China
| | - Chuanzhen Yang
- Department of Physiology, Basic Medical College, Nanchang University, Nanchang, China
| | - Haibin Kuang
- Department of Physiology, Basic Medical College, Nanchang University, Nanchang, China
- Jiangxi Provincial Key Laboratory of Reproductive Physiology and Pathology, Nanchang University, Nanchang, China
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Zanol JF, Niño OMS, da Costa CS, Freitas-Lima LC, Miranda-Alves L, Graceli JB. Tributyltin and high-refined carbohydrate diet lead to metabolic and reproductive abnormalities, exacerbating premature ovary failure features in the female rats. Reprod Toxicol 2021; 103:108-123. [PMID: 34102259 DOI: 10.1016/j.reprotox.2021.06.004] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2021] [Revised: 05/20/2021] [Accepted: 06/02/2021] [Indexed: 12/30/2022]
Abstract
Exposure to the obesogen tributyltin (TBT) alone or high carbohydrate diet (HCD) alone leads to obesity and reproductive complications, such as premature ovary failure (POF) features. However, little is known about interactions between TBT and nutrition and their combined impact on reproduction. In this study, we assessed whether acute TBT and HCD exposure results in reproductive and metabolic irregularities. Female rats were treated with TBT (100 ng/kg/day) and fed with HCD for 15 days and metabolic and reproductive outcomes were assessed. TBT and HCD rats displayed metabolic impairments, such as increased adiposity, abnormal lipid profile and triglyceride and glucose (TYG) index, worsening adipocyte hypertrophy in HCD-TBT rats. These metabolic consequences were linked with reproductive disorders. Specifically, HCD-TBT rats displayed irregular estrous cyclicity, high follicle-stimulating hormone (FSH) levels, low anti-Müllerian hormone (AMH) levels, reduction in ovarian reserve, and corpora lutea (CL) number, with increases in atretic follicles, suggesting that HCD-TBT exposure exacerbated POF features. Further, strong negative correlations were observed between adipocyte hypertrophy and ovarian reserve, CL number and AMH levels. HCD-TBT exposure resulted in reproductive tract inflammation and fibrosis. Collectively, these data suggest that TBT plus HCD exposure leads to metabolic and reproductive abnormalities, exacerbating POF features in female rats.
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Affiliation(s)
- Jordana F Zanol
- Department of Morphology, Health Sciences Center, Federal University of Espirito Santo, Av. Marechal Campos, 1468, CEP: 290440-090 Vitória, ES, Brazil.
| | - Oscar M S Niño
- Department of Morphology, Health Sciences Center, Federal University of Espirito Santo, Av. Marechal Campos, 1468, CEP: 290440-090 Vitória, ES, Brazil; Bachelor of Physical Education and Sports, Faculty of Human Sciences and Education, Universidad de los Llanos, Villavicencio-Meta, Colombia.
| | - Charles S da Costa
- Department of Morphology, Health Sciences Center, Federal University of Espirito Santo, Av. Marechal Campos, 1468, CEP: 290440-090 Vitória, ES, Brazil.
| | - Leandro C Freitas-Lima
- Department of Morphology, Health Sciences Center, Federal University of Espirito Santo, Av. Marechal Campos, 1468, CEP: 290440-090 Vitória, ES, Brazil.
| | - Leandro Miranda-Alves
- Experimental Endocrinology Research, Development and Innovation Group, Institute of Biomedical Sciences, Federal University of Rio de Janeiro, Brazil; Postgraduate Program in Endocrinology, School of Medicine, Federal University of Rio de Janeiro. Av. Carlos Chagas Filho, Ilha do Governador, Cidade Universitária, RJ, UFRJ, Brazil.
| | - Jones B Graceli
- Department of Morphology, Health Sciences Center, Federal University of Espirito Santo, Av. Marechal Campos, 1468, CEP: 290440-090 Vitória, ES, Brazil.
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Li G, Chang X, Zhao Y, Li D, Kang X. Dibutyltin (DBT) inhibits in vitro androgen biosynthesis of rat immature Leydig cells. Toxicology 2021; 456:152779. [PMID: 33862173 DOI: 10.1016/j.tox.2021.152779] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2020] [Revised: 03/14/2021] [Accepted: 04/08/2021] [Indexed: 11/17/2022]
Abstract
Dibutyltin (DBT) is an organotine widely applied in stabilizing plastics and de-worm poultry agents. But the effects of DBT on immature Leydig cells remain elusive. Thus, the present study aims to investigate whether in vitro exposure to DBT affects immature Leydig cell function of androgen production and delineate the underlying mechanisms. 35 days old rat immature Leydig cells were isolated and exposed to DBT at different concentrations (0, 0.1, 0.5, and 1 μM). It was found that 0.5 and 1 μM DBT lowered androgen production from immature Leydig cells under basal conditions. DBT at 1 μM lowered androgen production from immature Leydig cells under the stimulations from luteinizing hormone or 8-Br-cAMP. DBT at 1 μM lowered 22R-hydroxycholesterol and pregnenolone-mediated androgen production from immature Leydig cells. DBT at 0.1, 0.5, and 1 μM down-regulated the mRNA expression levels of Lhcgr, Star, Cyp11a1, Hsd3b1, and Nr5a1. Further investigation found that DBT at 1 μM directly inhibited CYP11A1 and 3β-HSD1 enzyme activities. In conclusion, this study told us that in vitro exposure to DBT inhibited androgen biosynthesis in immature Leydig cells by selectively interfering with the expressions and enzyme activities of CYP11A1 and 3β-HSD1.
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Affiliation(s)
- Guoping Li
- Department of Urology, Hainan General Hospital, Hainan Affiliated Hospital of Hainan Medical University, Haikou 570311, China
| | - Xiuting Chang
- Hainan Institute for Food Control (Hainan Experimental Animal Center), Haikou 570314, China
| | - Yingshu Zhao
- Hainan Institute for Drug Control, Hainan Key Laboratory for Pharmaceutical Quality Research, Haikou 570216, China
| | - Daoyuan Li
- Department of Urology, Hainan General Hospital, Hainan Affiliated Hospital of Hainan Medical University, Haikou 570311, China
| | - Xinli Kang
- Department of Urology, Hainan General Hospital, Hainan Affiliated Hospital of Hainan Medical University, Haikou 570311, China.
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Lv H, Wang J, Wang M, Shen L, Xiao L, Chen T, Sun T, Li W, Zhu L, Zhang X. Potent inhibition of tributyltin (TBT) and triphenyltin (TPT) against multiple UDP-glucuronosyltransferases (UGT): A new potential mechanism underlying endocrine disrupting actions. Food Chem Toxicol 2021; 149:112039. [DOI: 10.1016/j.fct.2021.112039] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 01/13/2021] [Accepted: 01/29/2021] [Indexed: 02/03/2023]
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12
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Baser E, Kırmızı DA, Turksoy VA, Onat T, Çaltekin MD, Kara M, Yalvac ES. Environmental Exposures in the Etiology of Abortion: Placental Toxic and Trace Element Levels. Z Geburtshilfe Neonatol 2020; 224:339-347. [PMID: 33063300 DOI: 10.1055/a-1263-1698] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
PURPOSE Intensive research has been conducted on the effects of toxic and trace elements on pregnancy. Previous studies indicated a possible relationship between placental levels of these elements and first-trimester abortion; however, their effects on the further gestational weeks are not clear. This study aimed to investigate the effect of changes in the levels of placental trace and toxic elements on second-trimester abortion. METHODS The patient group consisted of 30 women with missed abortion. The control group comprised 60 healthy term and singleton pregnant women who gave birth. Placental samples were obtained from the patients and the healthy controls, and the concentrations of placental elements were measured using inductively coupled plasma mass spectrometry. RESULTS In the abortion group, placental arsenic, cadmium, mercury, lead, antimony, tin, cobalt, manganese, and selenium levels were significantly higher than those of the control group (p<0.05). Antimony was determined as an independent predictor with an odds ratio of 6.1 in toxic elements (p=0.025), and selenium was determined as an independent predictor with an odds ratio of 2.3 in trace elements (p=0.015). CONCLUSION The changes in trace element and toxic element levels, especially an increase in antimony and selenium, in placental tissue due to environmental exposure may play an important role in second-trimester abortion.
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Affiliation(s)
- Emre Baser
- Yozgat Bozok University, Faculty of Medicine, Department of Obstetrics and Gynecology, Yozgat, Turkey
| | - Demet Aydogan Kırmızı
- Yozgat Bozok University, Faculty of Medicine, Department of Obstetrics and Gynecology, Yozgat, Turkey
| | - Vugar Ali Turksoy
- Yozgat Bozok University, Faculty of Medicine, Department of Public Health, Yozgat, Turkey
| | - Taylan Onat
- Yozgat Bozok University, Faculty of Medicine, Department of Obstetrics and Gynecology, Yozgat, Turkey
| | - Melike Demir Çaltekin
- Yozgat Bozok University, Faculty of Medicine, Department of Obstetrics and Gynecology, Yozgat, Turkey
| | - Mustafa Kara
- Ahi Evran University Training and Research Hospital, Department of Obstetrics and Gynecology, Kırşehir, Turkey
| | - Ethem Serdar Yalvac
- Yozgat Bozok University, Faculty of Medicine, Department of Obstetrics and Gynecology, Yozgat, Turkey
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Sushak L, Gabure S, Maise J, Arnett J, Whalen MM. Dibutyltin alters immune cell production of the pro-inflammatory cytokines interleukin (IL) 1β and IL-6: role of mitogen-activated protein kinases and changes in mRNA. J Appl Toxicol 2020; 40:1047-1059. [PMID: 32141102 PMCID: PMC7354221 DOI: 10.1002/jat.3964] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2019] [Revised: 02/06/2020] [Accepted: 02/20/2020] [Indexed: 12/12/2022]
Abstract
Dibutyltin (DBT) is used to stabilize plastics and as a deworming agent in some poultry. It is found in human blood (levels as high as 0.3 μM). Interleukin (IL) 1β (IL-1β) and IL-6 are pro-inflammatory cytokines produced by lymphocytes, monocytes, and other cells. Elevated levels of IL-1β and IL-6 have been associated with pathologies including rheumatoid arthritis and cancers. DBT was shown to decrease IL-1β and IL-6 secretion from immune cells at higher concentrations while causing increases at lower concentrations. However, it was not clear if these changes were due to DBT's alteration of the secretory process or due its ability to change cellular synthesis/production of these proteins. This study addresses this question, as well as mechanisms for any observed changes in synthesis/production. Monocyte-depleted peripheral blood mononuclear cells (MD-PBMCs) were exposed to DBT at concentrations of 5, 2.5, 1, 0.5, 0.25, 0.1, and 0.05 μM for 1, 6, and 24 h and the production (combination of secreted and intracellular levels from the same cells) of both IL-1β and IL-6 were measured. Effects of selected DBT exposures on cytokine production were also examined in PBMCs and DBT's effects were similar when monocytes were present. The 24-h exposures to DBT decreased production of both IL-1β and IL-6 at the two highest concentrations but increased production at lower concentrations. Both decreases and increases in cytokine production appear to be explained by DBT-induced changes in mRNA levels. DBT-induced increases in cellular production of the cytokines appear to require p38 and ERK1/2 MAPK pathways.
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Affiliation(s)
- Linda Sushak
- Department of Chemistry, Tennessee State University, Nashville, TN, USA
| | - Sahra Gabure
- Department of Chemistry, Tennessee State University, Nashville, TN, USA
| | - JaQuel Maise
- Department of Chemistry, Tennessee State University, Nashville, TN, USA
| | - Jessica Arnett
- Department of Chemistry, Tennessee State University, Nashville, TN, USA
| | - Margaret M Whalen
- Department of Chemistry, Tennessee State University, Nashville, TN, USA
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Stossi F, Dandekar RD, Johnson H, Lavere P, Foulds CE, Mancini MG, Mancini MA. Tributyltin chloride (TBT) induces RXRA down-regulation and lipid accumulation in human liver cells. PLoS One 2019; 14:e0224405. [PMID: 31710612 PMCID: PMC6844554 DOI: 10.1371/journal.pone.0224405] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/09/2019] [Accepted: 10/12/2019] [Indexed: 11/19/2022] Open
Abstract
A subset of environmental chemicals acts as "obesogens" as they increase adipose mass and lipid content in livers of treated rodents. One of the most studied class of obesogens are the tin-containing chemicals that have as a central moiety tributyltin (TBT), which bind and activate two nuclear hormone receptors, Peroxisome Proliferator Activated Receptor Gamma (PPARG) and Retinoid X Receptor Alpha (RXRA), at nanomolar concentrations. Here, we have tested whether TBT chloride at such concentrations may affect the neutral lipid level in two cell line models of human liver. Indeed, using high content image analysis (HCA), TBT significantly increased neutral lipid content in a time- and concentration-dependent manner. Consistent with the observed increased lipid accumulation, RNA fluorescence in situ hybridization (RNA FISH) and RT-qPCR experiments revealed that TBT enhanced the steady-state mRNA levels of two key genes for de novo lipogenesis, the transcription factor SREBF1 and its downstream enzymatic target, FASN. Importantly, pre-treatment of cells with 2-deoxy-D-glucose reduced TBT-mediated lipid accumulation, thereby suggesting a role for active glycolysis during the process of lipid accumulation. As other RXRA binding ligands can promote RXRA protein turnover via the 26S proteasome, TBT was tested for such an effect in the two liver cell lines. We found that TBT, in a time- and dose-dependent manner, significantly reduced steady-state RXRA levels in a proteasome-dependent manner. While TBT promotes both RXRA protein turnover and lipid accumulation, we found no correlation between these two events at the single cell level, thereby suggesting an additional mechanism may be involved in TBT promotion of lipid accumulation, such as glycolysis.
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Affiliation(s)
- Fabio Stossi
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, United States of America
- Integrated Microscopy Core, Baylor College of Medicine, Houston, TX, United States of America
- GCC Center for Advanced Microscopy and Image Informatics, Houston, TX, United States of America
| | - Radhika D. Dandekar
- Integrated Microscopy Core, Baylor College of Medicine, Houston, TX, United States of America
| | - Hannah Johnson
- Integrated Microscopy Core, Baylor College of Medicine, Houston, TX, United States of America
- GCC Center for Advanced Microscopy and Image Informatics, Houston, TX, United States of America
| | - Philip Lavere
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, United States of America
| | - Charles E. Foulds
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, United States of America
- Center for Precision Environmental Health, Baylor College of Medicine, Houston, TX, United States of America
| | - Maureen G. Mancini
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, United States of America
- GCC Center for Advanced Microscopy and Image Informatics, Houston, TX, United States of America
| | - Michael A. Mancini
- Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX, United States of America
- Integrated Microscopy Core, Baylor College of Medicine, Houston, TX, United States of America
- GCC Center for Advanced Microscopy and Image Informatics, Houston, TX, United States of America
- Center for Precision Environmental Health, Baylor College of Medicine, Houston, TX, United States of America
- Department of Pharmacology and Chemical Biology, Baylor College of Medicine, Houston, TX, United States of America
- Dan L. Duncan Comprehensive Cancer Center; Baylor College of Medicine, Houston, TX, United States of America
- Center for Translational Cancer Research, Institute of Biosciences and Technology, Texas A&M University, Houston, TX, United States of America
- * E-mail:
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15
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Kulbay M, Johnson B, Bernier J. DNA fragmentation factor 40 expression in T cells confers sensibility to tributyltin-induced apoptosis. Toxicology 2019; 426:152255. [PMID: 31401084 DOI: 10.1016/j.tox.2019.152255] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2019] [Revised: 07/18/2019] [Accepted: 07/26/2019] [Indexed: 02/07/2023]
Abstract
DNA fragmentation factor 40 (DFF40), an endonuclease, mediates the final and irreversible step of apoptosis by conducting oligonucleosomal DNA fragmentation. New emerging studies have proposed a role of DFF40 in genomic stability, besides its nuclease activity. Overexpression of DFF40 in tumoral cells increases their sensitivity to chemotherapeutic drugs. In this study, we sought to determine if DFF40 expression influences the toxicity of tributyltin (TBT), a well-known immunotoxic and apoptosis-inducing compound. The strategy used was to knockout DFF40 expression by CRISPR-cas9 method in Jurkat T cells and to determine the toxicity of TBT in DFF40 KO cells and DFF40 WT Jurkat cells. DFF40 KO Jurkat cells show an increase of cell viability following a 24-h TBT exposure (p < 0.05). There is a resistance to TBT-induced apoptosis determined by annexin V/PI am labeling (p < 0.05). Interestingly, the basal level of ROS rises in DFF40 KO Jurkat cells, but ROS production levels after TBT exposure remains at the same basal level. Other apoptosis or DNA damage makers (procaspase-3, caspase-6, and PARP cleavage) are significantly delayed and decreased. DFF40 deficient cells do not present histone H2AX phosphorylation, whereas wild-type cells present a phosphorylation following a 6-h exposure to TBT (p < 0.001). The re-expression of DFF40 in DFF40 KO cells restores the cytotoxic effects of TBT. Overall, these data suggest a role of DFF40 in cells sensitivity to TBT and possibly in DNA stability.
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Affiliation(s)
- Merve Kulbay
- INRS-Institut Armand-Frappier, 531 boulevard des Prairies, H7V 1B7, Laval, Québec, Canada
| | - Bruno Johnson
- INRS-Institut Armand-Frappier, 531 boulevard des Prairies, H7V 1B7, Laval, Québec, Canada
| | - Jacques Bernier
- INRS-Institut Armand-Frappier, 531 boulevard des Prairies, H7V 1B7, Laval, Québec, Canada.
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16
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Xu J, Ou K, Chen C, Li B, Guo J, Zuo Z, Wang C. Tributyltin exposure disturbs hepatic glucose metabolism in male mice. Toxicology 2019; 425:152242. [PMID: 31306684 DOI: 10.1016/j.tox.2019.152242] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2019] [Revised: 06/15/2019] [Accepted: 07/09/2019] [Indexed: 01/07/2023]
Abstract
Some previous studies showed that organotin compounds induced diabetes in animal models. The underlying mechanisms should be further revealed. In this study, male KM mice were exposed to tributyltin (TBT) at 0.5, 5 and 50 μg/kg once every three days for 45 days. The TBT-treated mice exhibited an elevation of fasting blood glucose level and glucose intolerance. The fasting serum insulin levels were increased and reached a significant difference in the 50 μg/kg group; the glucagon levels were significantly decreased in all the treatments. Pancreatic β-cell mass was significantly decreased in all the treatments; α-cell mass showed a significant decrease in the 5 and 50 ug/kg groups. The transcription of pancreatic insulin gene (Ins2) showed an up-regulation and reached a significant difference in the 5 and 50 μg/kg groups, which would be responsible for the increased serum insulin levels. The transcription of glucagon gene (Gcg) in the pancreas was significantly down-regulated in the 5 and 50 ug/kg groups. The protein expression of hepatic glucagon receptor was down-regulated, while the expression of glucose-6-phosphatase and phosphoenolpyruvate carboxykinase was up-regulated accompanied by increased hepatic glycogen content. These results indicated that hepatic gluconeogenesis was enhanced during insulin resistance stage caused by TBT exposure, which would exert a potential risk inducing the development of diabetes mellitus.
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Affiliation(s)
- Jing Xu
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen, People's Republic of China
| | - Kunlin Ou
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen, People's Republic of China
| | - Chuqiao Chen
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen, People's Republic of China
| | - Binshui Li
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen, People's Republic of China
| | - Jiaojiao Guo
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen, People's Republic of China
| | - Zhenghong Zuo
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen, People's Republic of China
| | - Chonggang Wang
- State Key Laboratory of Cellular Stress Biology, School of Life Sciences, Xiamen University, Xiamen, People's Republic of China.
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Multispecies study: low-dose tributyltin impairs ovarian theca cell cholesterol homeostasis through the RXR pathway in five mammalian species including humans. Arch Toxicol 2019; 93:1665-1677. [PMID: 31006824 DOI: 10.1007/s00204-019-02449-y] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2019] [Accepted: 04/09/2019] [Indexed: 12/17/2022]
Abstract
Tributyltin (TBT), an organotin chemical used as a catalyst and biocide, can stimulate cholesterol efflux in non-steroidogenic cells. Since cholesterol is the first limiting step for sex hormone production, we hypothesized that TBT disrupts intracellular cholesterol transport and impairs steroidogenesis in ovarian theca cells. We investigated TBT's effect on cholesterol trafficking, luteinization, and steroidogenesis in theca cells of five species (human, sheep, cow, pig, and mice). Primary theca cells were exposed to an environmentally relevant dose of TBT (1 or 10 ng/ml) and/or retinoid X receptor (RXR) antagonist. The expression of RXRα in sheep theca cells was knocked down using shRNA. Steroidogenic enzymes, cholesterol transport factors, and nuclear receptors were measured by RT-qPCR and Western blotting, and intracellular cholesterol, progesterone, and testosterone secretion by ELISA. TBT upregulated StAR and ABCA1 in ovine cells, and SREBF1 mRNA in theca cells. TBT also reduced intracellular cholesterol and upregulated ABCA1 protein expression but did not alter testosterone or progesterone production. RXR antagonist and RXRα knockdown demonstrates that TBT's effect is partially through RXR. TBT's effect on ABCA1 and StAR expression was recapitulated in all five species. TBT, at an environmentally relevant dose, stimulates theca cell cholesterol extracellular efflux via the RXR pathway, triggers a compensatory upregulation of StAR that regulates cholesterol transfer into the mitochondria and SREBF1 for de novo cholesterol synthesis. Similar results were obtained in all five species evaluated (human, sheep, cow, pig, and mice) and are supportive of TBT's conserved mechanism of action across mammalian species.
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18
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Huang X, Ma T, Yin Y. Dibutyltin Dichloride Retards Leydig Cell Developmental Regeneration in Adult Rat Testis. Front Pharmacol 2018; 9:1320. [PMID: 30555322 PMCID: PMC6283912 DOI: 10.3389/fphar.2018.01320] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2018] [Accepted: 10/29/2018] [Indexed: 12/21/2022] Open
Abstract
Dibutyltin dichloride (DBTCl), widely used as plastic stabilizer, can cause comprehensive toxicity. The present study aims to investigate the effects of DBTCl on rat Leydig cell developmental regeneration and characterize the related mechanism. Adult male Sprague Dawley rats were randomly divided into four groups and gavaged with saline (control) or 5, 10, or 20 mg/kg/day of DBTCl consecutively for 10 days. At the end of the DBTCl treatment, all rats received a single intraperitoneal injection (i.p.,) of 75 mg/kg ethane dimethane sulfonate (EDS) to eliminate all the adult Leydig cells and to induce Leydig cell developmental regeneration. Leydig cell developmental regeneration was evaluated by measuring the levels of serum testosterone, luteinizing hormone, and follicle-stimulating hormone on days 7, 35, and 56 post-EDS. Leydig cell gene and protein expression levels, as well as cell morphology and cell counts were also carried out on day 56 post-EDS. The present study found that DBTCl significantly reduced serum testosterone levels on days 35 and 56 post-EDS, but increased serum luteinizing hormone (LH) and follicle-stimulating hormone (FSH) levels on day 56 at ≥ 5 mg/kg/day. The mRNA and protein levels of Leydig (Lhcgr, Scarb1, Star, Cyp11a1, Hsd17b3, and Hsd11b1) and Sertoli cells (Fshr, Amh, and Sox9) were significantly downregulated in the DBTCl-treated testes compared to the control. Immunohistochemical staining showed that DBTCl-treatment caused fewer regenerated Leydig cells and impaired Sertoli cell development and function in the testis on day 56 post-EDS. In conclusion, the present study demonstrates that DBTCl retards rat Leydig cell developmental regeneration by downregulating steroidogenesis-related enzymes at the gene and protein levels, inhibiting Leydig cell proliferation and impairing Sertoli cell function and development.
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Affiliation(s)
- Xiande Huang
- Department of Urology, Gansu Provincial Hospital, Lanzhou, China
| | - Taoye Ma
- Department of Urology, Second Provincial People's Hospital of Gansu, Lanzhou, China
| | - Yongsheng Yin
- Department of Urology, Gansu Provincial Hospital, Lanzhou, China
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19
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Veiga-Lopez A, Pu Y, Gingrich J, Padmanabhan V. Obesogenic Endocrine Disrupting Chemicals: Identifying Knowledge Gaps. Trends Endocrinol Metab 2018; 29:607-625. [PMID: 30017741 PMCID: PMC6098722 DOI: 10.1016/j.tem.2018.06.003] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/17/2018] [Revised: 06/11/2018] [Accepted: 06/14/2018] [Indexed: 02/07/2023]
Abstract
Endocrine disrupting chemicals (EDCs) are compounds that are part of everyday consumer products and industrial manufacturing processes. EDCs can interfere with the endocrine system, including the adipose tissue. Accumulating evidence from epidemiological, animal, and in vitro studies demonstrates that EDCs can alter body weight, adipose tissue expansion, circulating lipid profile, and adipogenesis, with some resulting in transgenerational effects. These outcomes appear to be mediated through multiple mechanisms, from nuclear receptor binding to epigenetic modifications. A better understanding of the signaling pathways via which these EDCs contribute to an obesogenic phenotype, the interaction amongst complex mixtures of obesogenic EDCs, and the risks they pose relative to the obesity epidemic are still needed for risk assessment and development of prevention strategies.
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Affiliation(s)
- Almudena Veiga-Lopez
- Department of Animal Science, College of Agriculture and Natural Resources, Michigan State University, East Lansing, MI 48824, USA.
| | - Yong Pu
- Department of Animal Science, College of Agriculture and Natural Resources, Michigan State University, East Lansing, MI 48824, USA
| | - Jeremy Gingrich
- Department of Animal Science, College of Agriculture and Natural Resources, Michigan State University, East Lansing, MI 48824, USA; Department of Pharmacology and Toxicology, College of Natural Sciences, Michigan State University, East Lansing, MI 48824, USA
| | - Vasantha Padmanabhan
- Department of Pediatrics, University of Michigan, Ann Arbor, MI 48109, USA; Department of Obstetrics and Gynecology, University of Michigan, Ann Arbor, MI 48109, USA; Department of Molecular and Integrative Physiology, University of Michigan, Ann Arbor, MI 48109, USA; Department of Environmental Health Sciences, University of Michigan, Ann Arbor, MI 48109, USA.
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20
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Prenatal exposure to oxidative phosphorylation xenobiotics and late-onset Parkinson disease. Ageing Res Rev 2018; 45:24-32. [PMID: 29689408 DOI: 10.1016/j.arr.2018.04.006] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2018] [Revised: 04/20/2018] [Accepted: 04/20/2018] [Indexed: 12/21/2022]
Abstract
Late-onset Parkinson disease is a multifactorial and multietiological disorder, age being one of the factors implicated. Genetic and/or environmental factors, such as pesticides, can also be involved. Up to 80% of dopaminergic neurons of the substantia nigra are lost before motor features of the disorder begin to appear. In humans, these neurons are only formed a few weeks after fertilization. Therefore, prenatal exposure to pesticides or industrial chemicals during crucial steps of brain development might also alter their proliferation and differentiation. Oxidative phosphorylation is one of the metabolic pathways sensitive to environmental toxicants and it is crucial for neuronal differentiation. Many inhibitors of this biochemical pathway, frequently found as persistent organic pollutants, affect dopaminergic neurogenesis, promote the degeneration of these neurons and increase the risk of suffering late-onset Parkinson disease. Here, we discuss how an early, prenatal, exposure to these oxidative phosphorylation xenobiotics might trigger a late-onset, old age, Parkinson disease.
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21
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Merlo E, Silva IV, Cardoso RC, Graceli JB. The obesogen tributyltin induces features of polycystic ovary syndrome (PCOS): a review. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART B, CRITICAL REVIEWS 2018; 21:181-206. [PMID: 30015594 DOI: 10.1080/10937404.2018.1496214] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Polycystic ovary syndrome (PCOS) is a heterogeneous syndrome characterized by abnormal reproductive cycles, irregular ovulation, and hyperandrogenism. This complex disorder has its origins both within and outside the hypothalamic-pituitary-ovarian axis. Cardio-metabolic factors, such as obesity and insulin resistance, contribute to the manifestation of the PCOS phenotype. Polycystic ovary syndrome is one of the most common endocrine disorders among women of reproductive age. Growing evidence suggested an association between reproductive and metabolic features of PCOS and exposure to endocrine-disrupting chemicals (EDC), such as bisphenol A. Further, the environmental obesogen tributyltin (TBT) was shown to induce reproductive, metabolic and cardiovascular abnormalities resembling those found in women and animal models of PCOS. However, the causal link between TBT exposure and PCOS development remains unclear. The objective of this review was to summarize the most recent research findings on the potential association between TBT exposure and development of PCOS-like features in animal models and humans.
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Affiliation(s)
- Eduardo Merlo
- a Department of Morphology , Federal University of Espirito Santo , Vitoria, Brazil
| | - Ian V Silva
- a Department of Morphology , Federal University of Espirito Santo , Vitoria, Brazil
| | - Rodolfo C Cardoso
- b Department of Animal Science , Texas A&M University , College Station, TX, USA
| | - Jones B Graceli
- a Department of Morphology , Federal University of Espirito Santo , Vitoria, Brazil
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Qiao X, Li Y, Mai J, Ji X, Li Q. Effect of Dibutyltin Dilaurate on Triglyceride Metabolism through the Inhibition of the mTOR Pathway in Human HL7702 Liver Cells. Molecules 2018; 23:E1654. [PMID: 29986449 PMCID: PMC6099942 DOI: 10.3390/molecules23071654] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2018] [Revised: 06/26/2018] [Accepted: 06/26/2018] [Indexed: 12/12/2022] Open
Abstract
Dibutyltin dilaurate (DBTD) has multiple applications in daily life. However, DBTD is easily deposited in the liver and affects liver functions. This study was designed to explore the effects of DBTD on triglyceride metabolism in human normal hepatocyte HL7702 cells. Our results showed that the intracellular fat contents were dose-dependently decreased by DBTD. The expression of lipolysis genes and proteins were elevated while the lipogenesis genes and proteins were diminished by DBTD. The phosphorylation levels of ribosomal S6 kinase 1 were reduced by both rapamycin and DBTD, indicating that the mTOR pathway was suppressed possibly. The decreased sterol regulatory element-binding protein 1C (SREBP1C) transcription levels, as well as the increased peroxisome proliferator-activated receptor alpha (PPARα) transcription levels, caused by rapamycin and DBTD corresponded to the inactive mTOR pathway. In conclusion, it was possible that DBTD reduced the intracellular triglyceride through depressing the mTOR pathway and affecting its downstream transcription factors.
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Affiliation(s)
- Xiaozhi Qiao
- School of Pharmaceutical Science, Shanxi Medical University, Taiyuan 030001, China.
| | - Yunlan Li
- School of Pharmaceutical Science, Shanxi Medical University, Taiyuan 030001, China.
- Department of Traditional Chinese Medicine, Shanxi University of Traditional Chinese Medicine, Jinzhong 030619, China.
| | - Jiaqi Mai
- School of Pharmaceutical Science, Shanxi Medical University, Taiyuan 030001, China.
| | - Xiaoqing Ji
- School of Pharmaceutical Science, Shanxi Medical University, Taiyuan 030001, China.
| | - Qingshan Li
- School of Pharmaceutical Science, Shanxi Medical University, Taiyuan 030001, China.
- Department of Traditional Chinese Medicine, Shanxi University of Traditional Chinese Medicine, Jinzhong 030619, China.
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Watt J, Baker AH, Meeks B, Pajevic PD, Morgan EF, Gerstenfeld LC, Schlezinger JJ. Tributyltin induces distinct effects on cortical and trabecular bone in female C57Bl/6J mice. J Cell Physiol 2018; 233:7007-7021. [PMID: 29380368 DOI: 10.1002/jcp.26495] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Accepted: 01/22/2018] [Indexed: 12/13/2022]
Abstract
The retinoid X receptors (RXR), peroxisome proliferator activated receptor gamma (PPARγ), and liver X receptors (LXR) all have been shown to regulate bone homeostasis. Tributyltin (TBT) is an environmental contaminant that is a dual RXRα/β and PPARγ agonist. TBT induces RXR, PPARγ, and LXR-mediated gene transcription and suppresses osteoblast differentiation in vitro. Bone marrow multipotent mesenchymal stromal cells derived from female C57BL/6J mice were more sensitive to suppression of osteogenesis by TBT than those derived from male mice. In vivo, oral gavage of 12 week old female, C57Bl/6J mice with 10 mg/kg TBT for 10 weeks resulted in femurs with a smaller cross-sectional area and thinner cortex. Surprisingly, TBT induced significant increases in trabecular thickness, number, and bone volume fraction. TBT treatment did not change the Rankl:Opg RNA ratio in whole bone, and histological analyses showed that osteoclasts in the trabecular space were minimally reduced. In contrast, expression of cardiotrophin-1, an osteoblastogenic cytokine secreted by osteoclasts, increased. In primary bone marrow macrophage cultures, TBT marginally inhibited the number of osteoclasts that differentiated, in spite of significantly suppressing expression of osteoclast markers Nfatc1, Acp5, and Ctsk and resorptive activity. TBT induced expression of RXR- and LXR-dependent genes in whole bone and in vitro osteoclast cultures. However, only an RXR antagonist, but not an LXR antagonist, significantly inhibited TBTs ability to suppress osteoclast differentiation. These results suggest that TBT has distinct effects on cortical versus trabecular bone, likely resulting from independent effects on osteoblast and osteoclast differentiation that are mediated through RXR.
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Affiliation(s)
- James Watt
- Department of Environmental Health, Boston University School of Public Health, Boston, Massachusetts
| | - Amelia H Baker
- Department of Medicine, Boston University School of Medicine, Boston, Massachusetts
| | - Brett Meeks
- Department of Orthopaedic Surgery, Boston University School of Medicine, Boston, Massachusetts
| | - Paola D Pajevic
- Department of Molecular and Cell Biology, Boston University School of Dental Medicine, Boston, Massachusetts
| | - Elise F Morgan
- Department of Orthopaedic Surgery, Boston University School of Medicine, Boston, Massachusetts.,Department of Mechanical Engineering, Boston University, Boston, Massachusetts
| | - Louis C Gerstenfeld
- Department of Orthopaedic Surgery, Boston University School of Medicine, Boston, Massachusetts
| | - Jennifer J Schlezinger
- Department of Environmental Health, Boston University School of Public Health, Boston, Massachusetts
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24
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Ximenes CF, Rodrigues SML, Podratz PL, Merlo E, de Araújo JFP, Rodrigues LCM, Coitinho JB, Vassallo DV, Graceli JB, Stefanon I. Tributyltin chloride disrupts aortic vascular reactivity and increases reactive oxygen species production in female rats. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:24509-24520. [PMID: 28900851 DOI: 10.1007/s11356-017-0061-8] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2016] [Accepted: 09/01/2017] [Indexed: 06/07/2023]
Abstract
Organotin compounds, such as tributyltin (TBT), are environment contaminants that induce bioaccumulation and have potential toxic effects on marine species and mammals. TBT have been banned by the International Maritime Organization in 2003. However, the assessment of butyltin and metal contents in marine sediments has demonstrated high residual levels of TBT in some cases exceeding 7000 ng Sn g-1. The acceptable daily intake (ADI) level for TBT established by the World Health Organization is 0.5 μg/kg bw/day is based on genotoxicity, reproduction, teratogenicity, immunotoxicity, and mainly neurotoxicity. However, their effect on the cardiovascular system is not well understood. In this study, female rats were exposed to 0.5 μg/kg/day of TBT for 15 days with the goal of understanding the effect of TBT on vascular function. Female Wistar rats were treated daily by gavage and divided into control (n = 10) and TBT (n = 10) groups. The aortic rings were incubated with phenylephrine in both the presence and absence of endothelium. The phenylephrine concentration-response curves were generated by exposing endothelium-intact samples to NG-nitro-L-arginine methyl ester (L-NAME), apocynin, superoxide dismutase (SOD), catalase, tiron, and allopurinol. Acetylcholine (ACh) and sodium nitroprusside (SNP) were used to evaluate the relaxation response. Exposure to TBT reduced serum 17β-estradiol E2 levels and increased vascular reactivity. After incubation with L-NAME, the vascular reactivity to phenylephrine was significantly higher. Apocynin, SOD, catalase, and tiron decreased the vascular reactivity to phenylephrine to a significantly greater extent in TBT-treated rats than in the control rat. The relaxation induced by ACh and SNP was significantly reduced in TBT rats. Exposure to TBT induced aortic wall atrophy and increased superoxide anion production and collagen deposition. These results provide evidence that exposing rats to the current ADI for TBT (0.5 μg/kg) for 15 days induced vascular dysfunction due to oxidative stress and morphological damage and should be considered an important cardiovascular risk factor.
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Affiliation(s)
- Carolina Falcão Ximenes
- Department of Physiological Sciences, Federal University of Espírito Santo, Av. Marechal Campos, 1468, Maruípe, Vitória, Espirito Santo, 29042-755, Brazil
| | - Samya Mere Lima Rodrigues
- Department of Physiological Sciences, Federal University of Espírito Santo, Av. Marechal Campos, 1468, Maruípe, Vitória, Espirito Santo, 29042-755, Brazil
| | - Priscila Lang Podratz
- Department of Morphology/CCS, Federal University of Espírito Santo, Av. Marechal Campos, 1468, Maruípe, Vitória, Espirito Santo, 290440-090, Brazil
| | - Eduardo Merlo
- Department of Morphology/CCS, Federal University of Espírito Santo, Av. Marechal Campos, 1468, Maruípe, Vitória, Espirito Santo, 290440-090, Brazil
| | - Julia Fernandez Puñal de Araújo
- Department of Morphology/CCS, Federal University of Espírito Santo, Av. Marechal Campos, 1468, Maruípe, Vitória, Espirito Santo, 290440-090, Brazil
| | - Lívia Carla Melo Rodrigues
- Department of Physiological Sciences, Federal University of Espírito Santo, Av. Marechal Campos, 1468, Maruípe, Vitória, Espirito Santo, 29042-755, Brazil
| | - Juliana Barbosa Coitinho
- Department of Physiological Sciences, Federal University of Espírito Santo, Av. Marechal Campos, 1468, Maruípe, Vitória, Espirito Santo, 29042-755, Brazil
| | - Dalton Valentim Vassallo
- Department of Physiological Sciences, Federal University of Espírito Santo, Av. Marechal Campos, 1468, Maruípe, Vitória, Espirito Santo, 29042-755, Brazil
| | - Jones Bernardes Graceli
- Department of Morphology/CCS, Federal University of Espírito Santo, Av. Marechal Campos, 1468, Maruípe, Vitória, Espirito Santo, 290440-090, Brazil.
| | - Ivanita Stefanon
- Department of Physiological Sciences, Federal University of Espírito Santo, Av. Marechal Campos, 1468, Maruípe, Vitória, Espirito Santo, 29042-755, Brazil.
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25
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Siewiera P, Różalska S, Bernat P. Estrogen-mediated protection of the organotin-degrading strain Metarhizium robertsii against oxidative stress promoted by monobutyltin. CHEMOSPHERE 2017; 185:96-104. [PMID: 28688342 DOI: 10.1016/j.chemosphere.2017.06.130] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Revised: 06/20/2017] [Accepted: 06/29/2017] [Indexed: 06/07/2023]
Abstract
Dibutyltin (DBT) is a global pollutant characterized by pro-oxidative properties. The fungal strain Metarhizium robertsii can eliminate high levels of DBT efficiently. In this study, induction of oxidative stress as well as its alleviation through the application of natural estrogens during the elimination of DBT by M. robertsii were evaluated. During the first 24 h of incubation, the initial concentration of DBT (20 mg l-1) was reduced to 3.1 mg l-1, with simultaneous formation of a major byproduct - monobutyltin (MBT). In the presence of estrone (E1) or 17β-estradiol (E2), the amounts of dibutyltin residues in the fungal cultures were found to be approximately 2-fold higher compared to cultures without estrogens, which was associated with the simultaneous utilization of the compounds by cytochrome P450 enzymes. On the other hand, MBT levels were approximately 2.5 times lower in the fungal cultures with the addition of one of the estrogens. MBT (not DBT) promotes the generation of O2-, H2O2, and NO at levels 65.89 ± 18.08, 4.04 ± 3.62, and 27.92 ± 1.95, respectively. Superoxide dismutase and catalase activities did not show any response of the M. robertsii strain against the overproduction of superoxide anion and hydrogen peroxide. Application of E1 as well as E2 ensured non-enzymatic defense against nitrosative and oxidative stress through scavenging of nitrogen and oxygen reactive species, and limited their levels from 1.5-fold to 21-fold, depending on the used estrogen.
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Affiliation(s)
- Paulina Siewiera
- Department of Industrial Microbiology and Biotechnology, Faculty of Biology and Environmental Protection, University of Lodz, Banacha 12/16, 90-237 Lodz, Poland
| | - Sylwia Różalska
- Department of Industrial Microbiology and Biotechnology, Faculty of Biology and Environmental Protection, University of Lodz, Banacha 12/16, 90-237 Lodz, Poland
| | - Przemysław Bernat
- Department of Industrial Microbiology and Biotechnology, Faculty of Biology and Environmental Protection, University of Lodz, Banacha 12/16, 90-237 Lodz, Poland.
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26
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Siewiera P, Różalska S, Bernat P. Efficient dibutyltin (DBT) elimination by the microscopic fungus Metarhizium robertsii under conditions of intensive aeration and ascorbic acid supplementation. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:12118-12127. [PMID: 28349308 PMCID: PMC5410213 DOI: 10.1007/s11356-017-8764-4] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/17/2016] [Accepted: 03/07/2017] [Indexed: 06/06/2023]
Abstract
Dibutyltin (DBT) is an environmental pollutant characterized by immunotoxic, neurotoxic, and pro-oxidant properties. In this study, an attempt was made to enhance DBT elimination by the Metarhizium robertsii strain. We observed enhanced fungal growth in the bioreactor (pO2 ≥ 20%) compared to flask cultures (μ max increased from 0.061 to 0.086 h-1). Moreover, under aerated conditions, M. robertsii mycelium with "hairy" morphology biodegraded DBT (20 mg l-1) 10-fold faster in the bioreactor than in the flask cultures. Monobutyltin (MBT) and a hydroxylated derivative of MBT (OHBuSnH2) were detected as by-products of dibutyltin debutylation. Simultaneous usage of glucose and butyltins indicates the comatabolic nature of monobutyltin and dibutyltin removal. In order to protect fungal cells from oxidative stress caused by DBT presence, vitamin C (20 mg l-1) was applied. Supplementation with ascorbic acid (AA) resulted in a 3-fold acceleration of MBT removal during the first 7 h of incubation. Using the HPLC-MS/MS technique, a quantitative analysis of malondialdehyde (MDA), a marker of oxidative stress, was performed. In the AA presence, a decrease in the MDA amount (about 45%) was observed compared to the case with fungal cells exposed to DBT alone.
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Affiliation(s)
- Paulina Siewiera
- Department of Industrial Microbiology and Biotechnology, Faculty of Biology and Environmental Protection, University of Lodz, Banacha 12/16, 90-237, Lodz, Poland
| | - Sylwia Różalska
- Department of Industrial Microbiology and Biotechnology, Faculty of Biology and Environmental Protection, University of Lodz, Banacha 12/16, 90-237, Lodz, Poland
| | - Przemysław Bernat
- Department of Industrial Microbiology and Biotechnology, Faculty of Biology and Environmental Protection, University of Lodz, Banacha 12/16, 90-237, Lodz, Poland.
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27
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Fang L, Xu C, Li J, Borggaard OK, Wang D. The importance of environmental factors and matrices in the adsorption, desorption, and toxicity of butyltins: a review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:9159-9173. [PMID: 28160180 DOI: 10.1007/s11356-017-8449-z] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2016] [Accepted: 01/11/2017] [Indexed: 06/06/2023]
Abstract
Butyltins (BTs) are considered as a group of the most important organometallic compounds in industry and agriculture. Due to their widespread use, large amounts of BTs including tributyltin (TBT), dibutyltin (DBT), and monobutyltin (MBT) have entered into the environment, and subsequently causing detrimental effects on humans and aquatic organisms. This work provides a critical review of recent studies on the adsorption, desorption, bioaccumulation, and toxicity of BTs that can notably influence the distribution of BTs in the environment. Influence of environmental factors (e.g., pH and salinity) and adsorbents in the matrices (e.g., minerals, organic carbons, and quartz) on the adsorption, desorption, and toxicity of BTs is particularly addressed.
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Affiliation(s)
- Liping Fang
- Department of Chemistry, Faculty of Material Sciences and Chemistry, China University of Geosciences, Wuhan, 430074, China.
| | - Cuihong Xu
- Department of Chemistry, Faculty of Material Sciences and Chemistry, China University of Geosciences, Wuhan, 430074, China
| | - Ji Li
- Department of Chemistry, Faculty of Material Sciences and Chemistry, China University of Geosciences, Wuhan, 430074, China.
| | - Ole K Borggaard
- Department of Plant and Environmental Sciences, University of Copenhagen, Thorvaldsensvej 40, DK-1871, Frederiksberg C, Denmark
| | - Dongsheng Wang
- Department of Chemistry, Faculty of Material Sciences and Chemistry, China University of Geosciences, Wuhan, 430074, China
- State Key Laboratory of Environmental Aquatic Chemistry, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China
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28
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Tributyltin exposure at noncytotoxic doses dysregulates pancreatic β-cell function in vitro and in vivo. Arch Toxicol 2017; 91:3135-3144. [PMID: 28180948 DOI: 10.1007/s00204-017-1940-y] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2016] [Accepted: 01/19/2017] [Indexed: 12/14/2022]
Abstract
Tributyltin (TBT) is an endocrine disruptor. TBT can be found in food and in human tissues and blood. Several animal studies revealed that organotins induced diabetes with decreased insulin secretion. The detailed effect and mechanism of TBT on pancreatic β-cell function still remain unclear. We investigated the effect and mechanism of TBT exposure at noncytotoxic doses relevant to human exposure on β-cell function in vitro and in vivo. The β-cell-derived RIN-m5F cells and pancreatic islets from mouse and human were treated with TBT (0.05-0.2 μM) for 0.5-4 h. Adult male mice were orally exposed to TBT (25 μg/kg/day) with or without antioxidant N-acetylcysteine (NAC) for 1-3 weeks. Assays for insulin secretion and glucose metabolism were carried out. Unlike previous studies, TBT at noncytotoxic concentrations significantly increased glucose-stimulated insulin secretion and intracellular Ca2+ ([Ca2+]i) in β-cells. The reactive oxygen species (ROS) production and phosphorylation of protein kinase C (PKC-pan) and extracellular signal-regulated kinase (ERK)1/2 were also increased. These TBT-triggered effects could be reversed by antiestrogen ICI182780 and inhibitors of ROS, [Ca2+]i, and PKC, but not ERK. Similarly, islets treated with TBT significantly increased glucose-stimulated insulin secretion, which could be reversed by ICI182780, NAC, and PKC inhibitor. Mice exposed to TBT for 3 weeks significantly increased blood glucose and plasma insulin and induced glucose intolerance and insulin resistance, which could be reversed by NAC. These findings suggest that low/noncytotoxic doses of TBT induce insulin dysregulation and disturb glucose homeostasis, which may be mediated through the estrogen receptor-regulated and/or oxidative stress-related signaling pathways.
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29
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López-Gallardo E, Llobet L, Emperador S, Montoya J, Ruiz-Pesini E. Effects of Tributyltin Chloride on Cybrids with or without an ATP Synthase Pathologic Mutation. ENVIRONMENTAL HEALTH PERSPECTIVES 2016; 124:1399-405. [PMID: 27129022 PMCID: PMC5010394 DOI: 10.1289/ehp182] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/01/2015] [Revised: 11/27/2015] [Accepted: 04/13/2016] [Indexed: 05/05/2023]
Abstract
BACKGROUND The oxidative phosphorylation system (OXPHOS) includes nuclear chromosome (nDNA)- and mitochondrial DNA (mtDNA)-encoded polypeptides. Many rare OXPHOS disorders, such as striatal necrosis syndromes, are caused by genetic mutations. Despite important advances in sequencing procedures, causative mutations remain undetected in some patients. It is possible that etiologic factors, such as environmental toxins, are the cause of these cases. Indeed, the inhibition of a particular enzyme by a poison could imitate the biochemical effects of pathological mutations in that enzyme. Moreover, environmental factors can modify the penetrance or expressivity of pathological mutations. OBJECTIVES We studied the interaction between mitochondrially encoded ATP synthase 6 (p.MT-ATP6) subunit and an environmental exposure that may contribute phenotypic differences between healthy individuals and patients suffering from striatal necrosis syndromes or other mitochondriopathies. METHODS We analyzed the effects of the ATP synthase inhibitor tributyltin chloride (TBTC), a widely distributed environmental factor that contaminates human food and water, on transmitochondrial cell lines with or without an ATP synthase mutation that causes striatal necrosis syndrome. Doses were selected based on TBTC concentrations previously reported in human whole blood samples. RESULTS TBTC modified the phenotypic effects caused by a pathological mtDNA mutation. Interestingly, wild-type cells treated with this xenobiotic showed similar bioenergetics when compared with the untreated mutated cells. CONCLUSIONS In addition to the known genetic causes, our findings suggest that environmental exposure to TBTC might contribute to the etiology of striatal necrosis syndromes. CITATION López-Gallardo E, Llobet L, Emperador S, Montoya J, Ruiz-Pesini E. 2016. Effects of tributyltin chloride on cybrids with or without an ATP synthase pathologic mutation. Environ Health Perspect 124:1399-1405; http://dx.doi.org/10.1289/EHP182.
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Affiliation(s)
- Ester López-Gallardo
- Departamento de Bioquímica, Biología Molecular y Celular,
- Instituto de Investigación Sanitaria de Aragón,
- CIBER de Enfermedades Raras (CIBERER), and
| | - Laura Llobet
- Departamento de Bioquímica, Biología Molecular y Celular,
- Instituto de Investigación Sanitaria de Aragón,
- CIBER de Enfermedades Raras (CIBERER), and
| | - Sonia Emperador
- Departamento de Bioquímica, Biología Molecular y Celular,
- Instituto de Investigación Sanitaria de Aragón,
- CIBER de Enfermedades Raras (CIBERER), and
| | - Julio Montoya
- Departamento de Bioquímica, Biología Molecular y Celular,
- Instituto de Investigación Sanitaria de Aragón,
- CIBER de Enfermedades Raras (CIBERER), and
- Address correspondence to E. Ruiz-Pesini, Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza. C/ Miguel Servet, 177. 50013-Zaragoza, Spain. Telephone: 34-976761640. E-mail: , or J. Montoya, Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza. C/ Miguel Servet, 177. 50013-Zaragoza, Spain. Telephone: 34-976761640. E-mail:
| | - Eduardo Ruiz-Pesini
- Departamento de Bioquímica, Biología Molecular y Celular,
- Instituto de Investigación Sanitaria de Aragón,
- CIBER de Enfermedades Raras (CIBERER), and
- Fundación ARAID, Universidad de Zaragoza, Zaragoza, Spain
- Address correspondence to E. Ruiz-Pesini, Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza. C/ Miguel Servet, 177. 50013-Zaragoza, Spain. Telephone: 34-976761640. E-mail: , or J. Montoya, Departamento de Bioquímica, Biología Molecular y Celular, Universidad de Zaragoza. C/ Miguel Servet, 177. 50013-Zaragoza, Spain. Telephone: 34-976761640. E-mail:
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Hoth A, Johannisson R, Ali SS, Schulze J, Siegers CP. Cytotoxicity of organotin compounds in different cultured cell lines. Toxicol Ind Health 2016. [DOI: 10.1191/0748233705th220oa] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
Organotin as monobutyltin (MBT), dibutyltin (DBT) and tributyltin (TBT) compounds are used as fungicides and anti-fouling compounds; small amounts are added to the new European Euro bills. Little is known about the toxicological profile of these compounds uptake and metabolism. We, therefore, studied the cytotoxicity of these agents in different cell lines, i.e., liver HepG2, renal LLCMK2 and ocular CEC cells. As a measure of cell growth and death, the neutral red assay and the release of LDH into the medium were used. IC50 values for growth inhibition by TBT were calculated as 160 nM in LLC-MK2, 150 nM in HepG2 and 180 nM in CEC cells; for DBT the corresponding values were higher, i.e., 500 nM DBT for LLC-MK2 cells, 300 nM for HepG2 cells and 220 nM for CE cells. ED50 values for LDH release indicating disturbances of the outer cell membrane was > 250 nM for TBT and > 350 nM for DBT in all cells. MBT was not toxic in concentrations up to 500 nM. Electron microscopic studies of cells treated with 300 nM tributyltin indicated severe mitochondrial damage with much less effect seen in other cell structures. We conclude that no differences exist between different cell lines that may serve as examples of tissues relevant for organotin exposure (eye), metabolism (liver) and specific metalloid damage (kidney). Growth inhibition was affected at organotin concentrations between 150 and 500 nM. This concentration is approximately 70-200 fold higher than values estimated in environmental samples.
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Affiliation(s)
- Annett Hoth
- Institute of Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Ratzeburger Allee 160, 23538 Lübeck, Germany
| | - Reiner Johannisson
- Institute of Pathology, University of Lübeck, Ratzeburger Allee 160, 23538 Lübeck, Germany
| | - Sarwar Syed Ali
- Institute of Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Ratzeburger Allee 160, 23538 Lübeck, Germany
| | - Johannes Schulze
- Office of the Dean, Johann Wolfgang Goethe-University Theodor Stern-Kai 7, 60590 Frankfurt/Main, Germany
| | - Claus-Peter Siegers
- Institute of Experimental and Clinical Pharmacology and Toxicology, University of Lübeck, Ratzeburger Allee 160, 23538 Lübeck, Germany,
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31
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Mitra S, Siddiqui WA, Khandelwal S. Differential susceptibility of brain regions to tributyltin chloride toxicity. ENVIRONMENTAL TOXICOLOGY 2015; 30:1393-1405. [PMID: 24895210 DOI: 10.1002/tox.22009] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/06/2014] [Revised: 05/22/2014] [Accepted: 05/27/2014] [Indexed: 06/03/2023]
Abstract
Tributyltin (TBT), a well-known endocrine disruptor, is an omnipresent environmental pollutant and is explicitly used in many industrial applications. Previously we have shown its neurotoxic potential on cerebral cortex of male Wistar rats. As the effect of TBT on other brain regions is not known, we planned this study to evaluate its effect on four brain regions (cerebellum, hippocampus, hypothalamus, and striatum). Four-week-old male Wistar rats were gavaged with a single dose of TBT-chloride (TBTC) (10, 20, and 30 mg/kg) and sacrificed on days 3 and 7, respectively. Effect of TBTC on blood-brain barrier (BBB) permeability and tin (Sn) accumulation were measured. Oxidative stress indexes such as reactive oxygen species (ROS), reduced and oxidized glutathione (GSH/GSSG) ratio, lipid peroxidation, and protein carbonylation were analyzed as they play an imperative role in various neuropathological conditions. Since metal catalyzed reactions are a major source of oxidant generation, levels of essential metals like iron (Fe), zinc (Zn), and calcium (Ca) were estimated. We found that TBTC disrupted BBB and increased Sn accumulation, both of which appear significantly correlated. Altered metal homeostasis and ROS generation accompanied by elevated lipid peroxidation and protein carbonylation indicated oxidative damage which appeared more pronounced in the striatum than in cerebellum, hippocampus, and hypothalamus. This could be associated to the depleted GSH levels in striatum. These results suggest that striatum is more susceptible to TBTC induced oxidative damage as compared with other brain regions under study.
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Affiliation(s)
- Sumonto Mitra
- Immunotoxicology Division, Council of Scientific and Industrial Research-Indian Institute of Toxicology Research (CSIR-IITR), Lucknow, India
- Department of Biochemistry, Jamia Hamdard, Hamdard University, New Delhi, India
| | - Waseem A Siddiqui
- Department of Biochemistry, Jamia Hamdard, Hamdard University, New Delhi, India
| | - Shashi Khandelwal
- Immunotoxicology Division, Council of Scientific and Industrial Research-Indian Institute of Toxicology Research (CSIR-IITR), Lucknow, India
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Podratz PL, Merlo E, Sena GC, Morozesk M, Bonomo MM, Matsumoto ST, da Costa MB, Zamprogno GC, Brandão PA, Carneiro MT, Miguel EDC, Miranda-Alves L, Silva IV, Graceli JB. Accumulation of organotins in seafood leads to reproductive tract abnormalities in female rats. Reprod Toxicol 2015; 57:29-42. [DOI: 10.1016/j.reprotox.2015.05.003] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/20/2014] [Revised: 04/21/2015] [Accepted: 05/07/2015] [Indexed: 11/30/2022]
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33
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Shao J, Stout I, Hendriksen PJM, van Loveren H, Peijnenburg AACM, Volger OL. Protein phosphorylation profiling identifies potential mechanisms for direct immunotoxicity. J Immunotoxicol 2015; 13:97-107. [PMID: 25715851 DOI: 10.3109/1547691x.2015.1016635] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Signaling networks are essential elements that are involved in diverse cellular processes. One group of fundamental components in various signaling pathways concerns protein tyrosine kinases (PTK). Various toxicants have been demonstrated to exert their toxicity via modulation of tyrosine kinase activity. The present study aimed to identify common cellular signaling pathways that are involved in chemical-induced direct immunotoxicity. To this end, an antibody array-based profiling approach was applied to assess effects of five immunotoxicants, two immunosuppressive drugs and two non-immunotoxic control chemicals on the phosphorylation of 28 receptor tyrosine kinases and 11 crucial signaling nodes in Jurkat T-cells. The phosphorylation of ribosomal protein S6 (RPS6) and of kinases Akt, Src and p44/42 were found to be commonly regulated by immunotoxicants and/or immunosuppressive drugs (at least three compounds), with the largest effect observed upon RPS6. Flow cytometry and Western blotting were used to further examine the effect of the model immunotoxicant TBTO on the components of the mTOR-p70S6K-RPS6 pathway. These analyses revealed that both TBTO and the mTOR inhibitor rapamycin inactivate RPS6, but via different mechanisms. Finally, a comparison of the protein phosphorylation data to previously obtained transcriptome data of TBTO-treated Jurkat cells resulted in a good correlation at the pathway level and indicated that TBTO affects ribosome biogenesis and leukocyte migration. The effect of TBTO on the latter process was confirmed using a CXCL12 chemotaxis assay.
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Affiliation(s)
- Jia Shao
- a RIKILT-Institute of Food Safety, Wageningen University and Research Centre , Wageningen , the Netherlands .,b Department of Toxicogenomics , Maastricht University , the Netherlands .,c Netherlands Toxicogenomics Centre , the Netherlands , and
| | - Inge Stout
- a RIKILT-Institute of Food Safety, Wageningen University and Research Centre , Wageningen , the Netherlands
| | - Peter J M Hendriksen
- a RIKILT-Institute of Food Safety, Wageningen University and Research Centre , Wageningen , the Netherlands .,c Netherlands Toxicogenomics Centre , the Netherlands , and
| | - Henk van Loveren
- b Department of Toxicogenomics , Maastricht University , the Netherlands .,c Netherlands Toxicogenomics Centre , the Netherlands , and.,d National Institute for Public Health and the Environment (RIVM) , Bilthoven , the Netherlands
| | - Ad A C M Peijnenburg
- a RIKILT-Institute of Food Safety, Wageningen University and Research Centre , Wageningen , the Netherlands .,c Netherlands Toxicogenomics Centre , the Netherlands , and
| | - Oscar L Volger
- a RIKILT-Institute of Food Safety, Wageningen University and Research Centre , Wageningen , the Netherlands .,c Netherlands Toxicogenomics Centre , the Netherlands , and
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Mitra S, Siddiqui WA, Khandelwal S. C-Phycocyanin protects against acute tributyltin chloride neurotoxicity by modulating glial cell activity along with its anti-oxidant and anti-inflammatory property: A comparative efficacy evaluation with N-acetyl cysteine in adult rat brain. Chem Biol Interact 2015; 238:138-50. [DOI: 10.1016/j.cbi.2015.06.016] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2015] [Revised: 05/11/2015] [Accepted: 06/08/2015] [Indexed: 12/28/2022]
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Baker AH, Watt J, Huang CK, Gerstenfeld LC, Schlezinger JJ. Tributyltin engages multiple nuclear receptor pathways and suppresses osteogenesis in bone marrow multipotent stromal cells. Chem Res Toxicol 2015; 28:1156-66. [PMID: 25932594 DOI: 10.1021/tx500433r] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Organotins are members of the environmental obesogen class of contaminants because they activate peroxisome proliferator-activated receptor γ (PPARγ), the essential regulator of adipogenesis. Exposure to thiazolidinediones (PPARγ ligands used to treat type 2 diabetes) is associated with increased fractures. Diminished bone quality likely results from PPARγ's role in promoting adipogenesis while suppressing osteogenesis of bone marrow multipotent mesenchymal stromal cells (BM-MSC). We hypothesized that tributyltin (TBT) would be a potent modifier of BM-MSC differentiation and a negative regulator of bone formation. Organotins interact with both PPARγ and retinoid X receptors (RXR), suggesting that they activate multiple nuclear receptor pathways. To investigate the role of RXR in the actions of TBT, the effects of PPARγ (rosiglitazone) and RXR (bexarotene, LG100268) agonists were compared to the effects of TBT in BMS2 cells and primary mouse BM-MSC cultures. In BMS2 cells, TBT induced the expression of Fabp4, Abca1, and Tgm2 in an RXR-dependent manner. All agonists suppressed osteogenesis in primary mouse BM-MSC cultures, based on decreased alkaline phosphatase activity, mineralization, and expression of osteoblast-related genes. While rosiglitazone and TBT strongly activated adipogenesis, based on lipid accumulation and expression of adipocyte-related genes, the RXR agonists did not. Extending these analyses to other RXR heterodimers showed that TBT and the RXR agonists activated the liver X receptor pathway, whereas rosiglitazone did not. Application of either a PPARγ antagonist (T0070907) or an RXR antagonist (HX531) significantly reduced rosiglitazone-induced suppression of bone nodule formation. Only the RXR antagonist significantly reduced LG100268- and TBT-induced bone suppression. The RXR antagonist also inhibited LG100268- and TBT-induced expression of Abca1, an LXR target gene, in primary BM-MSC cultures. These results provide novel evidence that TBT activates multiple nuclear receptor pathways in BM-MSCs, activation of RXR is sufficient to suppress osteogenesis, and TBT suppresses osteogenesis largely through its direct interaction with RXR.
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Affiliation(s)
- Amelia H Baker
- †Department of Medicine and §Department of Orthopaedic Surgery, Boston University School of Medicine, ‡Department of Environmental Health, Boston University School of Public Health, Boston, Massachusetts 02118, United States
| | - James Watt
- †Department of Medicine and §Department of Orthopaedic Surgery, Boston University School of Medicine, ‡Department of Environmental Health, Boston University School of Public Health, Boston, Massachusetts 02118, United States
| | - Cassie K Huang
- †Department of Medicine and §Department of Orthopaedic Surgery, Boston University School of Medicine, ‡Department of Environmental Health, Boston University School of Public Health, Boston, Massachusetts 02118, United States
| | - Louis C Gerstenfeld
- †Department of Medicine and §Department of Orthopaedic Surgery, Boston University School of Medicine, ‡Department of Environmental Health, Boston University School of Public Health, Boston, Massachusetts 02118, United States
| | - Jennifer J Schlezinger
- †Department of Medicine and §Department of Orthopaedic Surgery, Boston University School of Medicine, ‡Department of Environmental Health, Boston University School of Public Health, Boston, Massachusetts 02118, United States
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Dibutyltin promotes oxidative stress and increases inflammatory mediators in BV-2 microglia cells. Toxicol Lett 2014; 230:177-87. [DOI: 10.1016/j.toxlet.2014.03.001] [Citation(s) in RCA: 27] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2013] [Revised: 01/29/2014] [Accepted: 03/04/2014] [Indexed: 01/24/2023]
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Celada LJ, Whalen MM. Effects of butyltins on mitogen-activated-protein kinase kinase kinase and Ras activity in human natural killer cells. J Appl Toxicol 2014; 34:1002-11. [PMID: 24038145 PMCID: PMC3868639 DOI: 10.1002/jat.2921] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2013] [Revised: 07/10/2013] [Accepted: 07/21/2013] [Indexed: 01/05/2023]
Abstract
Butyltins (BTs) contaminate the environment and are found in human blood. BTs, tributyltin (TBT) and dibutyltin (DBT) diminish the cytotoxic function and levels of key proteins of human natural killer (NK) cells. NK cells are an initial immune defense against tumors, virally infected cells and antibody-coated cells and thus critical to human health. The signaling pathways that regulate NK cell functions include mitogen-activated protein kinases (MAPKs). Studies have shown that exposure to BTs leads to activation of specific MAPKs and MAPK kinases (MAP2Ks) in human NK cells. MAP2K kinases (MAP3Ks) are upstream activators of MAP2Ks, which then activate MAPKs. The current study examined if BT-induced activation of MAP3Ks was responsible for MAP2K and thus, MAPK activation. This study examines the effects of TBT and DBT on the total levels of two MAP3Ks, c-Raf and ASK1, as well as activating and inhibitory phosphorylation sites on these MAP3Ks. In addition, the immediate upstream activator of c-Raf, Ras, was examined for BT-induced alterations. Our results show significant activation of the MAP3K, c-Raf, in human NK cells within 10 min of TBT exposure and the MAP3K, ASK1, after 1 h exposures to TBT. In addition, our results suggest that both TBT and DBT affect the regulation of c-Raf.
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Affiliation(s)
- Lindsay J Celada
- Department of Biological Sciences, Tennessee State University, Nashville, TN, USA
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Wang Y, Wang S, Luo X, Yang Y, Jian F, Wang X, Xie L. The roles of DNA damage-dependent signals and MAPK cascades in tributyltin-induced germline apoptosis in Caenorhabditis elegans. CHEMOSPHERE 2014; 108:231-238. [PMID: 24534158 DOI: 10.1016/j.chemosphere.2014.01.045] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/18/2013] [Revised: 12/23/2013] [Accepted: 01/11/2014] [Indexed: 06/03/2023]
Abstract
The induction of apoptosis is recognized to be a major mechanism of tributyltin (TBT) toxicity. However, the underlying signaling pathways for TBT-induced apoptosis remain unclear. In this study, using the nematode Caenorhabditis elegans, we examined whether DNA damage response (DDR) pathway and mitogen-activated protein kinase (MAPK) signaling cascades are involved in TBT-induced germline apoptosis and cell cycle arrest. Our results demonstrated that exposing worms to TBT at the dose of 10nM for 6h significantly increased germline apoptosis in N2 strain. Germline apoptosis was absent in strains that carried ced-3 or ced-4 loss-of-function alleles, indicating that both caspase protein CED-3 and Apaf-1 protein CED-4 were required for TBT-induced apoptosis. TBT-induced apoptosis was blocked in the Bcl-2 gain-of-function strain ced-9(n1950), whereas TBT induced a minor increase in the BH3-only protein EGL-1 mutated strain egl-1(n1084n3082). Checkpoint proteins HUS-1 and CLK-2 exerted proapoptotic effects, and the null mutation of cep-1, the homologue of tumor suppressor gene p53, significantly inhibited TBT-induced apoptosis. Apoptosis in the loss-of-function strains of ERK, JNK and p38 MAPK signaling pathways were completely or mildly suppressed under TBT stress. These results were supported by the results of mRNA expression levels of corresponding genes. The present study indicated that TBT-induced apoptosis required the core apoptotic machinery, and that DDR genes and MAPK pathways played essential roles in signaling the processes.
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Affiliation(s)
- Yun Wang
- Department of Life Sciences, Huainan Normal University, Huainan, Anhui 232001, PR China.
| | - Shunchang Wang
- Department of Life Sciences, Huainan Normal University, Huainan, Anhui 232001, PR China
| | - Xun Luo
- Department of Life Sciences, Huainan Normal University, Huainan, Anhui 232001, PR China
| | - Yanan Yang
- Department of Life Sciences, Huainan Normal University, Huainan, Anhui 232001, PR China
| | - Fenglei Jian
- Department of Life Sciences, Huainan Normal University, Huainan, Anhui 232001, PR China
| | - Xuemin Wang
- Department of Life Sciences, Huainan Normal University, Huainan, Anhui 232001, PR China
| | - Lucheng Xie
- Department of Life Sciences, Huainan Normal University, Huainan, Anhui 232001, PR China
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Zhang Y, Guo Z, Xu L. Tributyltin induces a G2/M cell cycle arrest in human amniotic cells via PP2A inhibition-mediated inactivation of the ERK1/2 cascades. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2014; 37:812-818. [PMID: 24632106 DOI: 10.1016/j.etap.2014.02.009] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2013] [Revised: 01/28/2014] [Accepted: 02/10/2014] [Indexed: 06/03/2023]
Abstract
The molecular mechanisms underlying the cell cycle alterations induced by tributyltin (TBT), a highly toxic environmental contaminant, remain elusive. In this study, cell cycle progression and some key regulators in G2/M phase were investigated in human amniotic cells treated with TBT. Furthermore, protein phosphatase (PP) 2A and the ERK cascades were examined. The results showed that TBT caused a G2/M cell cycle arrest that was accompanied by a decrease in the total cdc25C protein level and an increase in the p-cdc2 level in the nucleus. TBT caused a decrease in PP2A activity and inhibited the ERK cascade by inactivating Raf-1, resulting in the dephosphorylation of MEK1/2, ERK1/2, and c-Myc. Taken together, TBT leads to a G2/M cell cycle arrest in FL cells, an increase in p-cdc2 and a decrease in the levels of total cdc25C protein, which may be caused by the PP2A inhibition-mediated inactivation of the ERK1/2 cascades.
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Affiliation(s)
- Yali Zhang
- Department of Biochemistry, School of Medicine, Nantong University, 19 Qi Xiu Rode, 226001 Nantong, China; Department of Biochemistry and Genetics, School of Medicine, Zhejiang University, 388 Yu Hang Tang Road, 310058 Hangzhou, China.
| | - Zonglou Guo
- Department of Biosystem Engineering, College of Biosystem Engineering and Food Science, Zhejiang University, 388 Yu Hang Tang Road, 310058 Hangzhou, China.
| | - Lihong Xu
- Department of Biochemistry and Genetics, School of Medicine, Zhejiang University, 388 Yu Hang Tang Road, 310058 Hangzhou, China.
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Biemann R, Fischer B, Blüher M, Navarrete Santos A. Tributyltin affects adipogenic cell fate commitment in mesenchymal stem cells by a PPARγ independent mechanism. Chem Biol Interact 2014; 214:1-9. [PMID: 24513447 DOI: 10.1016/j.cbi.2014.01.021] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2013] [Revised: 12/30/2013] [Accepted: 01/30/2014] [Indexed: 11/30/2022]
Abstract
The food contaminant tributyltin (TBT) is an endocrine disrupting compound (EDC) promoting adipogenic differentiation in vitro and in vivo. Although prenatal TBT exposure has been shown to induce obesity, the underlying mechanisms and the role of the transcription factor PPARγ are not clarified yet. At different stages of adipogenesis, multipotent murine mesenchymal stem cells (MSC), C3H10T1/2, were exposed to TBT and analyzed for adipogenic differentiation, PPARγ promoter activation and PPARγ1, PPARγ2, Pref-1 and SOX9 expression. Depending on the exposure window, TBT promoted subsequent adipogenesis independently and dependently from PPARγ. In undifferentiated MSC, TBT exposure induced a transcriptional PPARγ-independent repression of Pref-1 and SOX9, which are both suppressors of adipogenic cell fate commitment. During hormonal induction TBT additionally enhanced adipogenic differentiation by PPARγ signaling. The impact of TBT on early cell fate development documents a novel mechanistic insight in the development of adipocytes derived from MSC and its susceptibility to EDC.
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Affiliation(s)
- Ronald Biemann
- Department of Anatomy and Cell Biology, Martin Luther University Faculty of Medicine, Grosse Steinstrasse 52, 06097 Halle (Saale), Germany.
| | - Bernd Fischer
- Department of Anatomy and Cell Biology, Martin Luther University Faculty of Medicine, Grosse Steinstrasse 52, 06097 Halle (Saale), Germany
| | - Matthias Blüher
- Department of Medicine, University of Leipzig, Liebigstrasse 20, 04103 Leipzig, Germany
| | - Anne Navarrete Santos
- Department of Anatomy and Cell Biology, Martin Luther University Faculty of Medicine, Grosse Steinstrasse 52, 06097 Halle (Saale), Germany
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Zhang Y, Chen Y, Sun L, Liang J, Guo Z, Xu L. Protein phosphatases 2A as well as reactive oxygen species involved in tributyltin-induced apoptosis in mouse livers. ENVIRONMENTAL TOXICOLOGY 2014; 29:234-242. [PMID: 22223438 DOI: 10.1002/tox.21751] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/09/2011] [Accepted: 11/25/2011] [Indexed: 05/31/2023]
Abstract
Tributyltin (TBT), a highly toxic environmental contaminant, has been shown to induce caspase-3-dependent apoptosis in human amniotic cells through protein phosphatase 2A (PP2A) inhibition and consequent JNK activation. This in vivo study was undertaken to further verify the results derived from our previous in vitro study. Mice were orally dosed with 0, 10, 20, and 60 mg/kg of body weight TBT, and levels of PP2A, reactive oxygen species (ROS), mitogen-activated protein kinase (MAPK), Bax/Bcl-2, and caspase-3 were detected in the mouse livers. Apoptosis was also evaluated using the TUNEL assay. The results showed that PP2A activity was inhibited, ROS levels were elevated, and MAPKs including ERK, JNK, and p38 were activated in mouse livers treated with the highest dose of TBT. Additionally, the ratio of Bax/Bcl-2 was increased, caspase-3 was activated, and apoptosis in mouse livers could be detected in the highest dose group. Therefore, a possible signaling pathway in TBT-induced apoptosis in mouse livers involves PP2A inhibition and ROS elevation serving a pivotal function as upstream activators of MAPKs; activation of MAPKs in turn leads to an increase in the Bax/Bcl-2 ratio, ultimately leading to the activation of caspase-3. The results give a comprehensive and novel description of the mechanism of TBT-induced toxicity.
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Affiliation(s)
- Yali Zhang
- Department of Biochemistry and Genetics, School of medicine, Zhejiang University, 866th Yu Hang Tang Road, 310058, Hangzhou, China
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Mitra S, Gera R, Singh V, Khandelwal S. Comparative toxicity of low dose tributyltin chloride on serum, liver, lung and kidney following subchronic exposure. Food Chem Toxicol 2014; 64:335-43. [DOI: 10.1016/j.fct.2013.11.031] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2013] [Revised: 11/21/2013] [Accepted: 11/24/2013] [Indexed: 01/27/2023]
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Biemann R, Fischer B, Navarrete Santos A. Adipogenic effects of a combination of the endocrine-disrupting compounds bisphenol A, diethylhexylphthalate, and tributyltin. Obes Facts 2014; 7:48-56. [PMID: 24503497 PMCID: PMC5644809 DOI: 10.1159/000358913] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/04/2013] [Accepted: 09/04/2013] [Indexed: 11/19/2022] Open
Abstract
OBJECTIVE The food contaminants bisphenol A (BPA), diethylhexylphthalate (DEHP), and tributyltin (TBT) are potent endocrine-disrupting compounds (EDC) known to interfere with adipogenesis. EDC usually act in mixtures and not as single compounds. The aim of this study was to investigate the effects of a simultaneous exposure of BPA, DEHP, and TBT on mesenchymal stem cell differentiation into adipocytes. METHODS Multipotent murine mesenchymal stem cells (C3H10T1/2) were exposed to EDC mixtures in high concentrations, i.e. MIX-high (10 µmol/l BPA, 100 µmol/l DEHP, 100 nmol/l TBT), and in environmentally relevant concentrations, i.e. MIX-low (10 nmol/l BPA, 100 nmol/l DEHP, 1 nmol/l TBT). The exposure was performed either for the entire culture time (0-12 days) or at distinct stages of adipogenic differentiation. At day 12 of cell culture, the amount of adipocytes, triglyceride content (TG), and adipogenic marker gene expression were analyzed. RESULTS MIX-high increased the development of adipocytes and the expression of adipogenic marker genes independently of the exposure window. The total TG amount was not increased. The low-concentrated EDC mixture had no obvious impact on adipogenesis. CONCLUSION In EDC mixtures, the adipogenic effect of TBT and DEHP predominates single effects of BPA. Mixture effects of EDC are not deducible from single compound experiments.
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Affiliation(s)
- Ronald Biemann
- *Ronald Biemann, Department of Clinical Chemistry and Pathobiochemistry, Otto-von-Guericke-University, Leipziger Straße 44, 39120 Magdeburg (Germany),
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Abstract
The obesogen hypothesis postulates the role of environmental chemical pollutants that disrupt homeostatic controls and adaptive mechanisms to promote adipose-dependent weight gain leading to obesity and metabolic syndrome complications. One of the most direct molecular mechanisms for coupling environmental chemical exposures to perturbed physiology invokes pollutants mimicking endogenous endocrine hormones or bioactive dietary signaling metabolites that serve as nuclear receptor ligands. The organotin pollutant tributyltin can exert toxicity through multiple mechanisms but most recently has been shown to bind, activate, and mediate RXR-PPARγ transcriptional regulation central to lipid metabolism and adipocyte biology. Data in support of long-term obesogenic effects on whole body adipose tissue are also reported. Organotins represent an important model test system for evaluating the impact and epidemiological significance of chemical insults as contributing factors for obesity and human metabolic health.
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Affiliation(s)
- Felix Grün
- The Center for Complex Biological Systems, University of California Irvine, Irvine, California, USA.
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Hamasaki T. Simultaneous determination of organotin compounds in textiles by gas chromatography–flame photometry following liquid/liquid partitioning with tert-butyl ethyl ether after reflux-extraction. Talanta 2013; 115:374-80. [DOI: 10.1016/j.talanta.2013.04.041] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2013] [Revised: 04/17/2013] [Accepted: 04/18/2013] [Indexed: 11/16/2022]
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Mitra S, Gera R, Siddiqui WA, Khandelwal S. Tributyltin induces oxidative damage, inflammation and apoptosis via disturbance in blood–brain barrier and metal homeostasis in cerebral cortex of rat brain: An in vivo and in vitro study. Toxicology 2013; 310:39-52. [DOI: 10.1016/j.tox.2013.05.011] [Citation(s) in RCA: 56] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/08/2013] [Revised: 05/22/2013] [Accepted: 05/24/2013] [Indexed: 01/06/2023]
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Zhang Y, Liang J, Sun L, Guo Z, Xu L. Inhibition of PP2A and the consequent activation of JNK/c-Jun are involved in tributyltin-induced apoptosis in human amnionic cells. ENVIRONMENTAL TOXICOLOGY 2013; 28:390-400. [PMID: 21626652 DOI: 10.1002/tox.20730] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2011] [Revised: 04/03/2011] [Accepted: 04/04/2011] [Indexed: 05/30/2023]
Abstract
Tributyltin (TBT), a highly toxic environmental contaminant, has been shown to induce mitochondrial-dependent apoptosis in several mammalian cells. However, the upstream signal transduction pathways involved in TBT-induced apoptosis are still not fully elucidated. In this study, the protein phosphatase (PP) 2A, microtubule organization, and mitogen-activated protein kinases (MAPKs), including JNK, p38 and their downstream transcription factors, c-Jun and ATF-2, respectively, were investigated in human amnionic cells treated by TBT. Furthermore, the activation of procaspase-3 after blocking either one of these MAPK pathways was also observed. The results showed that TBT effectively induced apoptosis characterized by caspase-3 activation. In apoptotic cells, the inhibition of PP2A activity and microtubule depolymerization was detected. Additionally, JNK and p38, as well as their downstream targets, c-Jun and ATF-2, were activated. Moreover, a JNK inhibitor, but not p38 inhibitor, significantly reduced caspase-3 activation. It can be concluded that the inhibition of PP2A may (1) play as a role in the activation of JNK and c-Jun and the concomitant promotion of microtubule depolymerization and (2) lead to the activation of caspase-3 in TBT-induced apoptotic cells. The results of this study suggest a critical role of PP2A in the TBT toxicity mechanism.
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Affiliation(s)
- Yali Zhang
- Department of Biochemistry and Genetics, School of medicine, Zhejiang University, 388 Yu Hang Tang Road, 310058, Hangzhou, China
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Ferreira M, Blanco L, Garrido A, Vieites JM, Cabado AG. In vitro approaches to evaluate toxicity induced by organotin compounds tributyltin (TBT), dibutyltin (DBT), and monobutyltin (MBT) in neuroblastoma cells. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:4195-4203. [PMID: 23534342 DOI: 10.1021/jf3050186] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
The toxic effects of the organotin compounds (OTCs) monobutyltin (MBT), dibutyltin (DBT), and tributyltin (TBT) were evaluated in vitro in a neuroblastoma human cell line. Mechanisms of cell death, apoptosis versus necrosis, were studied by using several markers: inhibition of cell viability and proliferation, F-actin, and mitochondrial membrane potential changes as well as reactive oxygen species (ROS) production and DNA fragmentation. The most toxic effects were detected with DBT and TBT even at very low concentrations (0.1-1 μM). In contrast, MBT induced lighter cytotoxic changes at the higher doses tested. None of the studied compounds stimulated propidium iodide uptake, although the most toxic chemical, TBT, caused lactate dehydrogenase release at the higher concentrations tested. These findings suggest that in neuroblastoma, OTC-induced cytotoxicity involves different pathways depending on the compound, concentration, and incubation time. A screening method for DBT and TBT quantification based on cell viability loss was developed, allowing a fast detection alternative to complex methodology.
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Affiliation(s)
- Martiña Ferreira
- Food Safety Division, ANFACO-CECOPESCA, Campus Univ. 16, 36310 Vigo PO, Spain
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Rantakokko P, Main KM, Wohlfart-Veje C, Kiviranta H, Airaksinen R, Vartiainen T, Skakkebæk NE, Toppari J, Virtanen HE. Association of placenta organotin concentrations with congenital cryptorchidism and reproductive hormone levels in 280 newborn boys from Denmark and Finland. Hum Reprod 2013; 28:1647-60. [PMID: 23520400 DOI: 10.1093/humrep/det040] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
STUDY QUESTION Is the placental burden of organotin compounds (OTCs) associated with congenital cryptorchidism in infant offspring from Finland and Denmark? SUMMARY ANSWER Increasing concentrations of OTCs had a negative association with cryptorchidism in Finland, whereas a positive association was found in Denmark. WHAT IS KNOWN ALREADY The rapid increase in the prevalence of cryptorchidism suggests that environmental factors, such as endocrine disruptors, may be involved. OTCs are endocrine disruptors at very low concentrations due to activation of the retinoid X receptor (RXR). STUDY DESIGN, SIZE, DURATION Between the years 1997 and 2001, placentas from mothers of cryptorchid boys and from healthy controls were collected from Denmark (39 cases, 129 controls) and Finland (56 cases, 56 controls). In Denmark 33 and 6 boys, and in Finland 22 and 34 boys had mild or severe cryptorchidism, respectively. The association between concentrations of four OTCs [monobutyltin (MBT), dibutyltin (DBT), tributyltin (TBT) and triphenyltin (TPhT)] and case-control status was estimated. PARTICIPANTS/MATERIALS, SETTING, METHODS In both countries, placenta samples were selected from larger cohorts. In Finland placenta samples were collected from boys with cryptorchidism at birth and matched controls (nested case-control design). Matching criteria were parity, maternal smoking (yes/no), diabetes (yes/no), gestational age (±7 days) and date of birth (±14 days). Numbers of controls per case was 1. In Denmark, all available placentas from cryptorchid boys were chosen and control placentas were selected randomly from the total Danish cohort (case-cohort design). The average number of controls per case was 3.3. OTCs in placenta samples were analysed with liquid extraction, ethylation and gas chromatography-mass spectrometry determination and coded by country-specific tertiles. MAIN RESULTS AND THE ROLE OF CHANCE Generally, the concentrations of OTCs were very low. For most analytes, a large proportion of samples (29-96% depending on the country and case-control status) had OTC concentrations below the limit of quantification (LOQ). As an exception, the concentration of TBT was >LOQ in 99% of Finnish placentas. The mean concentrations of DBT and TBT were 1.5 and 7 times higher in Finland than in Denmark, respectively. For DBT in Danish placentas, the odds ratio (OR) for cryptorchidism in the second tertile (0.10-0.14 ng/g) when compared with the first tertile (<0.10 ng/g, <LOQ) was 3.13 (95% CI 1.19-8.26) and the OR for the third tertile (≥0.15 ng/g) when compared with the first tertile was 4.01 (95% CI 1.42-11.33). For TBT in Finnish placentas, the OR for cryptorchidism in the second tertile (0.10-0.39 ng/g) when compared with the first tertile (<0.1 ng/g) was 0.61 (95% CI 0.18-2.01) and the OR for the third tertile (≥0.40 ng/g) when compared with the first tertile was 0.13 (95% CI 0.03-0.54). LIMITATIONS, REASONS FOR CAUTION The main limitation of the study was the relatively small number of mother-boy pairs that limits the extrapolation of the study results to the general population. Also misclassification of exposure is a reason for caution for two reasons: because the concentrations of most OTCs were below or only barely above the LOQ in a large proportion of samples and because it is not known how well OTCs measured from placenta represent exposure at the time window that is relevant for cryptorchidism occurrence. WIDER IMPLICATIONS OF THE FINDINGS This is the first study to measure the concentrations of OTCs from human placenta samples, and to associate these concentrations to cryptorchidism. As opposite results were obtained with regard to OTC concentration in placenta and cryptorchidism status in Finland and Denmark, and no mechanism is known at the moment by which OTCs could affect testicular descent, these results cannot be generalized to other populations. However, some animal tests described in the literature show opposite effects of OTCs on fat deposition at different ranges of exposure. It is also clearly shown in the literature that TBT has an impact on sexual development of gastropods through RXR. As TBT is known to activate human RXR, further laboratory studies should be designed to explore the potential impact of TBT on male sexual development.
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Affiliation(s)
- Panu Rantakokko
- National Institute for Health and Welfare, Department of Environmental Health, Chemical Exposure Unit, Neulaniementie 4, FI-70210 Kuopio, Finland.
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Bernat P, Szewczyk R, Krupiński M, Długoński J. Butyltins degradation by Cunninghamella elegans and Cochliobolus lunatus co-culture. JOURNAL OF HAZARDOUS MATERIALS 2013; 246-247:277-282. [PMID: 23314396 DOI: 10.1016/j.jhazmat.2012.12.034] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/25/2012] [Revised: 12/19/2012] [Accepted: 12/20/2012] [Indexed: 05/28/2023]
Abstract
Organotin compounds are ubiquitous in environment. However, biodegradation of tributyltin (TBT) and dibutyltin (DBT) to non toxic metabolites by fungi has been seldom observed. In this study we constructed a fungal co-culture with an efficient ability of TBT and its metabolites removal. The microscopic fungus strain Cunninghamella elegans degraded TBT via hydroxybutyldibutyltin (OHBuDBT) to its metabolites: DBT and monobutyltin (MBT), which were then transformed by Cochliobolus lunatus. The sequential biodegradation resulted in a 10-fold decrease in samples toxicity to Artemia franciscana larvae. With an initial TBT concentration of 5 mg l(-1), the co-culture of both fungi almost completely eliminated butyltins during 12 days of incubation in synthetic medium. To our knowledge, this is the first report that the mixed fungal co-culture could efficiently degrade TBT. This process was associated with glucose utilization, and a cometabolic nature of butyltins removal by selected strains has been suggested.
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Affiliation(s)
- Przemysław Bernat
- Department of Industrial Microbiology and Biotechnology, Faculty of Biology and Environmental Protection, University of Lodz, Banacha 12/16, PL 90-237 Łódź, Poland
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