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Yang S, Yang S, Luo A. Phthalates and uterine disorders. REVIEWS ON ENVIRONMENTAL HEALTH 2024; 0:reveh-2023-0159. [PMID: 38452364 DOI: 10.1515/reveh-2023-0159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2023] [Accepted: 01/26/2024] [Indexed: 03/09/2024]
Abstract
Humans are ubiquitously exposed to environmental endocrine disrupting chemicals such as phthalates. Phthalates can migrate out of products and enter the human body through ingestion, inhalation, or dermal application, can have potential estrogenic/antiestrogenic and/or androgenic/antiandrogenic activity, and are involved in many diseases. As a female reproductive organ that is regulated by hormones such as estrogen, progesterone and androgen, the uterus can develop several disorders such as leiomyoma, endometriosis and abnormal bleeding. In this review, we summarize the hormone-like activities of phthalates, in vitro studies of endometrial cells exposed to phthalates, epigenetic modifications in the uterus induced by phthalate exposure, and associations between phthalate exposure and uterine disorders such as leiomyoma and endometriosis. Moreover, we also discuss the current research gaps in understanding the relationship between phthalate exposure and uterine disorders.
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Affiliation(s)
- Shuhong Yang
- Department of Obstetrics and Gynecology, 10487 National Clinical Research Center for Obstetrics and Gynecology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology , Wuhan, Hubei, People's Republic of China
| | - Shuhao Yang
- Department of Obstetrics and Gynecology, 10487 National Clinical Research Center for Obstetrics and Gynecology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology , Wuhan, Hubei, People's Republic of China
| | - Aiyue Luo
- Department of Obstetrics and Gynecology, 10487 National Clinical Research Center for Obstetrics and Gynecology, Tongji Hospital, Tongji Medical College, Huazhong University of Science and Technology , Wuhan, Hubei, People's Republic of China
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2
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Sim KS, Park S, Seo H, Lee SH, Lee HS, Park Y, Kim JH. Comparative study of estrogenic activities of phytoestrogens using OECD in vitro and in vivo testing methods. Toxicol Appl Pharmacol 2022; 434:115815. [PMID: 34848279 DOI: 10.1016/j.taap.2021.115815] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2021] [Revised: 11/23/2021] [Accepted: 11/24/2021] [Indexed: 01/08/2023]
Abstract
With growing scientific interest in phytoestrogens, a number of studies have investigated the estrogenic potential of phytoestrogens in a wide variety of assay systems. However, evaluations of individual phytoestrogens with different assay systems make it difficult for predicting their relative estrogenic potency. The objective of this study was to compare estrogenic properties of fifteen known phytoestrogens using an estrogen receptor-α (ER-α) dimerization assay and Organization for Economic Cooperation and Development (OECD) standardized methods including in vitro estrogen receptor (ER) transactivation assay using VM7Luc4E2 cells and in vivo uterotrophic assay using an immature rat model. Human ER-α dimerization assay showed positive responses of eight test compounds and negative responses of seven compounds. These results were consistently found in luciferase reporter assay results for evaluating ER transactivation ability. Seven test compounds exhibiting relatively higher in vitro estrogenic activities were subjected to uterotrophic bioassays. Significant increases in uterine weights were only found after treatments with biochanin A, 8-prenylnaringenin, and coumestrol. Importantly, their uterotrophic effects were lost when animals were co-treated with antagonist of ER, indicating their ER-dependent effects in the uterus. In addition, analysis of estrogen responsive genes revealed that these phytoestrogens regulated uterine gene expressions differently compared to estrogens. Test methods used in this study provided a high consistency between in vitro and in vivo results. Thus, they could be used as effective screening tools for phytoestrogens, particularly focusing on their interactions with ER-α.
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Affiliation(s)
- Kyu Sang Sim
- Department of Food Science and Biotechnology, Andong National University, Andong 36729, Republic of Korea
| | - Song Park
- Department of Food Science and Biotechnology, Andong National University, Andong 36729, Republic of Korea
| | - Huiwon Seo
- Department of Food Science and Biotechnology, Dongguk University, Gyeonggi-do 10326, Republic of Korea
| | - Seok-Hee Lee
- Department of Food Science and Biotechnology, Dongguk University, Gyeonggi-do 10326, Republic of Korea
| | - Hee-Seok Lee
- Department of Food Science and Technology, Chung-Ang University, Anseong 17546, Republic of Korea
| | - Yooheon Park
- Department of Food Science and Biotechnology, Dongguk University, Gyeonggi-do 10326, Republic of Korea
| | - Jun Ho Kim
- Department of Food Science and Biotechnology, Andong National University, Andong 36729, Republic of Korea.
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3
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Yang J, Link C, Henderson YO, Bithi N, Hine C. Peripubertal Bisphenol A Exposure Imparts Detrimental Age-Related Changes in Body Composition, Cognition, and Hydrogen Sulfide Production Capacities. Antioxid Redox Signal 2021; 36:1246-1267. [PMID: 34314248 PMCID: PMC9221154 DOI: 10.1089/ars.2020.8226] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/03/2020] [Revised: 07/16/2021] [Accepted: 07/18/2021] [Indexed: 12/19/2022]
Abstract
Aims: Peripubertal endocrine disruption has immediate and lifelong consequences on health, cognition, and lifespan. Disruption comes from dietary, environmental, and pharmaceutical sources. The plasticizer Bisphenol A (BPA) is one such endocrine disrupting chemical. However, it is unclear whether peripubertal BPA exposure incites long-lasting physiological, neuro-cognitive, and/or longevity-related metabolic impairments. Catabolism of cysteine via transsulfuration enzymes produces hydrogen sulfide (H2S), a redox-modulating gasotransmitter causative to endocrine and metabolic homeostasis and improved cognitive function with age. As thyroid hormone (TH) regulates hepatic H2S production and BPA is a TH receptor antagonist, we hypothesized that BPA exposure during peripubertal development impairs metabolic and neuro-cognitive/behavioral endpoints in aged mice, in part, due to altered peripheral and/or localized H2S production and redox status. Results: To test this, male C57BL/6J mice at 5 weeks of age were orally exposed daily for 5 weeks to 250 μg BPA/kg, defined as low dose group (LD BPA), or 250 mg BPA/kg, defined as high dose group (HD BPA). Both LD and HD BPA exposure decreased lean mass and increased fat mass accompanied by decreased serum total TH at advanced ages. In addition, LD BPA had an anxiogenic effect whereas HD BPA caused cognitive deficits. Notably, HD BPA disrupted tissue-specific H2S production capacities and/or protein persulfidation, with the former negatively correlated with memory deficits and oxidative stress. Innovation and Conclusion: These findings provide a potential mechanism of action for acute and long-term health impacts of BPA-induced peripubertal endocrine disruption and bolster the need for improved monitoring and limitation of adolescent BPA exposure.
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Affiliation(s)
- Jie Yang
- Department of Cardiovascular and Metabolic Sciences, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio, USA
| | - Christopher Link
- Department of Cardiovascular and Metabolic Sciences, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio, USA
| | - Yoko O. Henderson
- Department of Cardiovascular and Metabolic Sciences, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio, USA
| | - Nazmin Bithi
- Department of Cardiovascular and Metabolic Sciences, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio, USA
| | - Christopher Hine
- Department of Cardiovascular and Metabolic Sciences, Cleveland Clinic Lerner Research Institute, Cleveland, Ohio, USA
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4
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Yoon KS, Kwack SJ. In vitro and in vivo estrogenic activity of triclosan. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2021; 84:800-809. [PMID: 34193021 DOI: 10.1080/15287394.2021.1944940] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Triclosan (TCS) is an antibacterial and antifungal agent used in many consumer products and exhibits a chemical structure similar to non-steroidal estrogen, which is known to induce endocrine disruption. Triclosan has been found in human plasma, urine, and breast milk, and the safety of TCS-containing products has been disputed. Although studies attempted to determine the estrogenic activity of TCS, no clear results have emerged. The aim of the present study was to examine estrogenic activity of TCS using an in vitro E-screen assay and an in vivo uterotrophic assay. The in vitro E-screen assay demonstrated that TCS significantly enhanced proliferation of MCF-7 breast cancer cells, although not in a concentration-dependent manner. The in vivo uterotrophic results showed no significant change in the weight of uteri obtained from TCS-administered Sprague-Dawley rats. Further, to understand the estrogenic activity attributed to TCS at the molecular level, gene-expression profiling of uterus samples was performed from both TCS- or estrogen-treated rats and the genes and cellular processes affected by TCS or estrogen were compared. Data demonstrated that both the genes and cellular processes affected by TCS or estrogen were significantly similar, indicating the possibility that TCS-mediated estrogenic activity occurred at the global transcriptome level. In conclusion, in vitro and gene-profiling results suggested that TCS exhibited estrogenic activity.
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Affiliation(s)
- Kyung Sik Yoon
- Department of Bio Health Science, College of Natural Science, Changwon National University, Changwon Republic of Korea
| | - Seung Jun Kwack
- Department of Bio Health Science, College of Natural Science, Changwon National University, Changwon Republic of Korea
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5
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Camacho L, Lewis S, Vanlandingham M, Olson G, Davis K, Patton R, Twaddle N, Doerge D, Churchwell M, Bryant M, McLellen F, Woodling K, Felton R, Maisha M, Juliar B, Gamboa da Costa G, Delclos K. A two-year toxicology study of bisphenol A (BPA) in Sprague-Dawley rats: CLARITY-BPA core study results. Food Chem Toxicol 2019; 132:110728. [DOI: 10.1016/j.fct.2019.110728] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/30/2019] [Revised: 07/25/2019] [Accepted: 07/26/2019] [Indexed: 02/06/2023]
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6
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Alencar AKN, Montes GC, Costa DG, Mendes LVP, Silva AMS, Martinez ST, Trachez MM, Cunha VDMN, Montagnoli TL, Fraga AGM, Wang H, Groban L, Fraga CAM, Sudo RT, Zapata-Sudo G. Cardioprotection Induced by Activation of GPER in Ovariectomized Rats With Pulmonary Hypertension. J Gerontol A Biol Sci Med Sci 2019; 73:1158-1166. [PMID: 29790948 DOI: 10.1093/gerona/gly068] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2017] [Accepted: 04/26/2018] [Indexed: 01/09/2023] Open
Abstract
Pulmonary hypertension (PH) is a disease of women (female-to-male ratio 4:1), and is associated with cardiac and skeletal muscle dysfunction. Herein, the activation of a new estrogen receptor (GPER) by the agonist G1 was evaluated in oophorectomized rats with monocrotaline (MCT)-induced PH. Depletion of estrogen was induced by bilateral oophorectomy (OVX) in Wistar rats. Experimental groups included SHAM or OVX rats that received a single intraperitoneal injection of MCT (60 mg/kg) for PH induction. Animals received s.c. injection of either vehicle or G1, a GPER agonist, (400 µg/kg/day) for 14 days after the onset of disease. Rats with PH exhibited exercise intolerance and cardiopulmonary alterations, including reduced pulmonary artery flow, biventricular remodeling, and left ventricular systolic and diastolic dysfunction. The magnitude of these PH-induced changes was significantly greater in OVX versus SHAM rats. G1 treatment reversed both cardiac and skeletal muscle functional aberrations caused by PH in OVX rats. G1 reversed PH-related cardiopulmonary dysfunction and exercise intolerance in female rats, a finding that may have important implications for the ongoing clinical evaluation of new drugs for the treatment of the disease in females after the loss of endogenous estrogens.
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Affiliation(s)
- Allan K N Alencar
- Programa de Pesquisa em Desenvolvimento de Fármacos, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil
| | - Guilherme C Montes
- Programa de Pesquisa em Desenvolvimento de Fármacos, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil
| | - Daniele G Costa
- Programa de Pesquisa em Desenvolvimento de Fármacos, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil
| | - Luiza V P Mendes
- Programa de Pesquisa em Desenvolvimento de Fármacos, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil.,Departamento de Farmacologia, Universidade Estácio de Sá, Rio de Janeiro, Brazil
| | - Ananssa M S Silva
- Programa de Pesquisa em Desenvolvimento de Fármacos, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil
| | - Sabrina T Martinez
- Departamento de Química, Instituto de Química, Campus do Valonguinho, Universidade Federal Fluminense, Niterói - RJ, Brazil
| | - Margarete M Trachez
- Programa de Pesquisa em Desenvolvimento de Fármacos, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil
| | - Valéria do M N Cunha
- Programa de Pesquisa em Desenvolvimento de Fármacos, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil
| | - Tadeu L Montagnoli
- Programa de Pesquisa em Desenvolvimento de Fármacos, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil
| | - Aline G M Fraga
- Faculdade de Farmácia da Universidade Federal do Rio de Janeiro, Centro de Ciências da Saúde, Ilha do Fundão Cidade Universitária, Brazil
| | - Hao Wang
- Departments of Anesthesiology and Internal Medicine-Molecular Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Leanne Groban
- Departments of Anesthesiology and Internal Medicine-Molecular Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Carlos A M Fraga
- Programa de Pesquisa em Desenvolvimento de Fármacos, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil
| | - Roberto T Sudo
- Programa de Pesquisa em Desenvolvimento de Fármacos, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil
| | - Gisele Zapata-Sudo
- Programa de Pesquisa em Desenvolvimento de Fármacos, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Brazil
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da Silva JS, Gabriel-Costa D, Wang H, Ahmad S, Sun X, Varagic J, Sudo RT, Ferrario CM, Dell Italia LJ, Sudo GZ, Groban L. Blunting of cardioprotective actions of estrogen in female rodent heart linked to altered expression of cardiac tissue chymase and ACE2. J Renin Angiotensin Aldosterone Syst 2018; 18:1470320317722270. [PMID: 28748720 PMCID: PMC5805468 DOI: 10.1177/1470320317722270] [Citation(s) in RCA: 27] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
Background: Diastolic dysfunction develops in response to hypertension and estrogen (E2) loss and is a forerunner to heart failure (HF) in women. The cardiac renin–angiotensin system (RAS) contributes to diastolic dysfunction, but its role with respect to E2 and blood pressure remain unclear. Methods: We compared the effects of ovariectomy (OVX) or sham surgery on the cardiac RAS, left ventricular (LV) structure/function, and systemic/intracardiac pressures of spontaneously hypertensive rats (SHRs: n = 6 intact and 6 OVX) and age-matched Wistar-Kyoto (WKY: n = 5 intact and 4 OVX) controls. Results: WKY rats were more sensitive to OVX than SHRs with respect to worsening of diastolic function, as reflected by increases in Doppler-derived filling pressures (E/e′) and reductions in myocardial relaxation (e′). This pathobiologic response in WKY rats was directly linked to increases in cardiac gene expression and enzymatic activity of chymase and modest reductions in ACE2 activity. No overt changes in cardiac RAS genes or activities were observed in SHRs, but diastolic function was inversely related to ACE2 activity. Conclusion: Endogenous estrogens exert a more significant regulatory role upon biochemical components of the cardiac RAS of WKY versus SHRs, modulating the lusitropic and structural components of its normotensive phenotype.
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Affiliation(s)
- Jacqueline S da Silva
- 1 Research Program Development of Drugs, Institute of Biomedical Sciences Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Daniele Gabriel-Costa
- 1 Research Program Development of Drugs, Institute of Biomedical Sciences Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Hao Wang
- 2 The Department of Anesthesiology, Wake Forest School of Medicine, Winston Salem, North Carolina, USA.,3 The Department of Internal Medicine-Molecular Medicine, Wake Forest School of Medicine, Winston Salem, North Carolina, USA
| | - Sarfaraz Ahmad
- 4 The Department of Surgery, Wake Forest School of Medicine, Winston Salem, North Carolina, USA
| | - Xuming Sun
- 2 The Department of Anesthesiology, Wake Forest School of Medicine, Winston Salem, North Carolina, USA
| | - Jasmina Varagic
- 4 The Department of Surgery, Wake Forest School of Medicine, Winston Salem, North Carolina, USA
| | - Roberto T Sudo
- 1 Research Program Development of Drugs, Institute of Biomedical Sciences Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Carlos M Ferrario
- 4 The Department of Surgery, Wake Forest School of Medicine, Winston Salem, North Carolina, USA.,5 The Department of Internal Medicine-Nephrology, Wake Forest School of Medicine, Winston Salem, North Carolina, USA
| | - Louis J Dell Italia
- 6 Division of Cardiovascular Disease, University of Alabama at Birmingham and Department of Veterans Affairs, Birmingham Veterans Affairs Medical Center, Birmingham, Alabama, USA
| | - Gisele-Zapata Sudo
- 1 Research Program Development of Drugs, Institute of Biomedical Sciences Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Leanne Groban
- 2 The Department of Anesthesiology, Wake Forest School of Medicine, Winston Salem, North Carolina, USA.,3 The Department of Internal Medicine-Molecular Medicine, Wake Forest School of Medicine, Winston Salem, North Carolina, USA
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8
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Zhang M, van Ravenzwaay B, Fabian E, Rietjens IMCM, Louisse J. Towards a generic physiologically based kinetic model to predict in vivo uterotrophic responses in rats by reverse dosimetry of in vitro estrogenicity data. Arch Toxicol 2017; 92:1075-1088. [PMID: 29234833 PMCID: PMC5866837 DOI: 10.1007/s00204-017-2140-5] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/08/2017] [Accepted: 12/05/2017] [Indexed: 11/28/2022]
Abstract
Physiologically based kinetic (PBK) modelling-based reverse dosimetry is a promising tool for the prediction of in vivo developmental toxicity using in vitro concentration–response data. In the present study, the potential of this approach to predict the dose-dependent increase of uterus weight in rats upon exposure to estrogenic chemicals was assessed. In vitro concentration–response data of 17β-estradiol (E2) and bisphenol A (BPA) obtained in the MCF-7/BOS proliferation assay, the U2OS ER-CALUX assay and the yeast estrogen screen (YES) assay, were translated into in vivo dose–response data in rat, using a PBK model with a minimum number of in vitro and in silico determined parameter values. To evaluate the predictions made, benchmark dose (BMD) analysis was performed on the predicted dose–response data and the obtained BMDL10 values were compared with BMDL10 values derived from data on the effects of E2 and BPA in the uterotrophic assay reported in the literature. The results show that predicted dose–response data of E2 and BPA matched with the data from in vivo studies when predictions were made based on YES assay data. The YES assay-based predictions of the BMDL10 values differed 3.9-fold (E2) and 4.7- to 13.4-fold (BPA) from the BMDL10 values obtained from the in vivo data. The present study provides the proof-of-principle that PBK modelling-based reverse dosimetry of YES assay data using a minimum PBK model can predict dose-dependent in vivo uterus growth caused by estrogenic chemicals. In future studies, the approach should be extended to include other estrogens.
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Affiliation(s)
- Mengying Zhang
- Division of Toxicology, Wageningen University, Stippeneng 4, 6708 WE, Wageningen, The Netherlands.
| | - Bennard van Ravenzwaay
- Division of Toxicology, Wageningen University, Stippeneng 4, 6708 WE, Wageningen, The Netherlands.,Experimental Toxicology and Ecology, BASF SE, Z 470, 67056, Ludwigshafen, Germany
| | - Eric Fabian
- Experimental Toxicology and Ecology, BASF SE, Z 470, 67056, Ludwigshafen, Germany
| | - Ivonne M C M Rietjens
- Division of Toxicology, Wageningen University, Stippeneng 4, 6708 WE, Wageningen, The Netherlands
| | - Jochem Louisse
- Division of Toxicology, Wageningen University, Stippeneng 4, 6708 WE, Wageningen, The Netherlands
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9
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Ahmad S, Sun X, Lin M, Varagic J, Zapata-Sudo G, Ferrario CM, Groban L, Wang H. Blunting of estrogen modulation of cardiac cellular chymase/RAS activity and function in SHR. J Cell Physiol 2017; 233:3330-3342. [PMID: 28888034 DOI: 10.1002/jcp.26179] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Accepted: 08/24/2017] [Indexed: 12/16/2022]
Abstract
The relatively low efficacy of ACE-inhibitors in the treatment of heart failure in women after estrogen loss may be due to their inability to reach the intracellular sites at which angiotensin (Ang) II is generated and/or the existence of cell-specific mechanisms in which ACE is not the essential processing pathway for Ang II formation. We compared the metabolic pathway for Ang II formation in freshly isolated myocytes (CMs) and non-myocytes (NCMs) in cardiac membranes extracted from hearts of gonadal-intact and ovariectomized (OVX) adult WKY and SHR rats. Plasma Ang II levels were higher in WKY vs. SHR (strain effect: WKY: 62 ± 6 pg/ml vs. SHR: 42 ± 9 pg/ml; p < 0.01), independent of OVX. The enzymatic activities of chymase, ACE, and ACE2 were higher in NCMs versus CMs, irrespective of whether assays were performed in cardiac membranes from WKY or SHR or in the presence or absence of OVX. E2 depletion increased chymase activity, but not ACE activity, in both CMs and NCMs. Moreover, cardiac myocyte chymase activity associated with diastolic function in WKYs and cardiac structure in SHRs while no relevant functional and structural relationships between the classic enzymatic pathway of Ang II formation by ACE or the counter-regulatory Ang-(1-7) forming path from Ang II via ACE2 were apparent. The significance of these novel findings is that targeted cell-specific chymase rather than ACE inhibition may have a greater benefit in the management of HF in women after menopause.
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Affiliation(s)
- Sarfaraz Ahmad
- Departments of Surgery, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Xuming Sun
- Anesthesiology, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Marina Lin
- Anesthesiology, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Jasmina Varagic
- Departments of Surgery, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Gisele Zapata-Sudo
- Division of Biomedical Sciences, Federal University of Rio de Janeiro, Rio de Janeiro, Brazil
| | - Carlos M Ferrario
- Departments of Surgery, Wake Forest School of Medicine, Winston-Salem, North Carolina.,Department of Physiology-Pharmacology, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Leanne Groban
- Anesthesiology, Wake Forest School of Medicine, Winston-Salem, North Carolina.,Internal Medicine-Molecular Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Hao Wang
- Anesthesiology, Wake Forest School of Medicine, Winston-Salem, North Carolina.,Internal Medicine-Molecular Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina
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10
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Kwon B, Ji K. Estrogenic and Androgenic Potential of Phthalates and Their Alternatives. ACTA ACUST UNITED AC 2016. [DOI: 10.5668/jehs.2016.42.3.169] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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Kleinstreuer NC, Ceger PC, Allen DG, Strickland J, Chang X, Hamm JT, Casey WM. A Curated Database of Rodent Uterotrophic Bioactivity. ENVIRONMENTAL HEALTH PERSPECTIVES 2016; 124:556-62. [PMID: 26431337 PMCID: PMC4858395 DOI: 10.1289/ehp.1510183] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2015] [Accepted: 09/30/2015] [Indexed: 05/21/2023]
Abstract
BACKGROUND Novel in vitro methods are being developed to identify chemicals that may interfere with estrogen receptor (ER) signaling, but the results are difficult to put into biological context because of reliance on reference chemicals established using results from other in vitro assays and because of the lack of high-quality in vivo reference data. The Organisation for Economic Co-operation and Development (OECD)-validated rodent uterotrophic bioassay is considered the "gold standard" for identifying potential ER agonists. OBJECTIVES We performed a comprehensive literature review to identify and evaluate data from uterotrophic studies and to analyze study variability. METHODS We reviewed 670 articles with results from 2,615 uterotrophic bioassays using 235 unique chemicals. Study descriptors, such as species/strain, route of administration, dosing regimen, lowest effect level, and test outcome, were captured in a database of uterotrophic results. Studies were assessed for adherence to six criteria that were based on uterotrophic regulatory test guidelines. Studies meeting all six criteria (458 bioassays on 118 unique chemicals) were considered guideline-like (GL) and were subsequently analyzed. RESULTS The immature rat model was used for 76% of the GL studies. Active outcomes were more prevalent across rat models (74% active) than across mouse models (36% active). Of the 70 chemicals with at least two GL studies, 18 (26%) had discordant outcomes and were classified as both active and inactive. Many discordant results were attributable to differences in study design (e.g., injection vs. oral dosing). CONCLUSIONS This uterotrophic database provides a valuable resource for understanding in vivo outcome variability and for evaluating the performance of in vitro assays that measure estrogenic activity. CITATION Kleinstreuer NC, Ceger PC, Allen DG, Strickland J, Chang X, Hamm JT, Casey WM. 2016. A curated database of rodent uterotrophic bioactivity. Environ Health Perspect 124:556-562; http://dx.doi.org/10.1289/ehp.1510183.
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Affiliation(s)
- Nicole C. Kleinstreuer
- Integrated Laboratory Systems, in support of the National Toxicology Program Interagency Center for Evaluation of Alternative Toxicological Methods (NICEATM), Research Triangle Park, North Carolina, USA
- Address correspondence to N.C. Kleinstreuer, National Toxicology Program (NTP), National Institute of Environmental Health Sciences (NIEHS), 530 Davis Dr., Keystone Building, Durham, NC 27713 USA. Telephone: (919) 281-1110. E-mail:
| | - Patricia C. Ceger
- Integrated Laboratory Systems, in support of the National Toxicology Program Interagency Center for Evaluation of Alternative Toxicological Methods (NICEATM), Research Triangle Park, North Carolina, USA
| | - David G. Allen
- Integrated Laboratory Systems, in support of the National Toxicology Program Interagency Center for Evaluation of Alternative Toxicological Methods (NICEATM), Research Triangle Park, North Carolina, USA
| | - Judy Strickland
- Integrated Laboratory Systems, in support of the National Toxicology Program Interagency Center for Evaluation of Alternative Toxicological Methods (NICEATM), Research Triangle Park, North Carolina, USA
| | - Xiaoqing Chang
- Integrated Laboratory Systems, in support of the National Toxicology Program Interagency Center for Evaluation of Alternative Toxicological Methods (NICEATM), Research Triangle Park, North Carolina, USA
| | - Jonathan T. Hamm
- Integrated Laboratory Systems, in support of the National Toxicology Program Interagency Center for Evaluation of Alternative Toxicological Methods (NICEATM), Research Triangle Park, North Carolina, USA
| | - Warren M. Casey
- NICEATM, Division of the National Toxicology Program, National Institute of Environmental Health Sciences, National Institutes of Health, Department of Health and Human Services, Research Triangle Park, North Carolina, USA
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12
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Hass U, Christiansen S, Boberg J, Rasmussen MG, Mandrup K, Axelstad M. Low-dose effect of developmental bisphenol A exposure on sperm count and behaviour in rats. Andrology 2016; 4:594-607. [PMID: 27089241 DOI: 10.1111/andr.12176] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/14/2015] [Revised: 01/25/2016] [Accepted: 01/28/2016] [Indexed: 01/10/2023]
Abstract
Bisphenol A is widely used in food contact materials and other products and is detected in human urine and blood. Bisphenol A may affect reproductive and neurological development; however, opinion of the European Food Safety Authority (EFSA) on bisphenol A (EFSA J, 13, 2015 and 3978) concluded that none of the available studies were robust enough to provide a point of departure for setting a tolerable daily intake for bisphenol A. In the present study, pregnant Wistar rats (n = 17-21) were gavaged from gestation day 7 to pup day 22 with bisphenol A doses of 0, 25 μg, 250 μg, 5 mg or 50 mg/kg bw/day. In the offspring, growth, sexual maturation, weights and histopathology of reproductive organs, oestrus cyclicity and sperm counts were assessed. Neurobehavioural development was investigated using a behavioural testing battery including tests for motor activity, sweet preference, anxiety and spatial learning. Decreased sperm count was found at the lowest bisphenol A dose, that is 25 μg/kg/day, but not at the higher doses. Reproductive organ weight and histology were not affected and no behavioural effects were seen in male offspring. In the female offspring, exposure to 25 μg/kg bw/day bisphenol A dose resulted in increased body weight late in life and altered spatial learning in a Morris water maze, indicating masculinization of the brain. Decreased intake of sweetened water was seen in females from the highest bisphenol A dose group, also a possible sign of masculinization. The other investigated endpoints were not significantly affected. In conclusion, the present study using a robust experimental study design, has shown that developmental exposure to 25 μg/kg bw/day bisphenol A can cause adverse effects on fertility (decreased sperm count), neurodevelopment (masculinization of spatial learning in females) and lead to increased female body weight late in life. These results suggest that the new EFSA temporary tolerable daily intake of 4 μg/kg bw/day is not sufficiently protective with regard to endocrine disrupting effects of bisphenol A in humans.
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Affiliation(s)
- U Hass
- National Food Institute, Division of Diet, Disease Prevention and Toxicology, Technical University of Denmark, Søborg, Denmark
| | - S Christiansen
- National Food Institute, Division of Diet, Disease Prevention and Toxicology, Technical University of Denmark, Søborg, Denmark
| | - J Boberg
- National Food Institute, Division of Diet, Disease Prevention and Toxicology, Technical University of Denmark, Søborg, Denmark
| | - M G Rasmussen
- National Food Institute, Division of Diet, Disease Prevention and Toxicology, Technical University of Denmark, Søborg, Denmark
| | - K Mandrup
- National Food Institute, Division of Diet, Disease Prevention and Toxicology, Technical University of Denmark, Søborg, Denmark
| | - M Axelstad
- National Food Institute, Division of Diet, Disease Prevention and Toxicology, Technical University of Denmark, Søborg, Denmark
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13
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Alencar AK, da Silva JS, Lin M, Silva AM, Sun X, Ferrario CM, Cheng C, Sudo RT, Zapata-Sudo G, Wang H, Groban L. Effect of Age, Estrogen Status, and Late-Life GPER Activation on Cardiac Structure and Function in the Fischer344×Brown Norway Female Rat. J Gerontol A Biol Sci Med Sci 2016; 72:152-162. [PMID: 27006078 DOI: 10.1093/gerona/glw045] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2015] [Accepted: 02/25/2016] [Indexed: 01/08/2023] Open
Abstract
Age-associated changes in cardiac structure and function, together with estrogen loss, contribute to the progression of heart failure with preserved ejection fraction in older women. To investigate the effects of aging and estrogen loss on the development of its precursor, asymptomatic left ventricular diastolic dysfunction, echocardiograms were performed in 10 middle-aged (20 months) and 30 old-aged (30 months) female Fischer344×Brown-Norway rats, 4 and 8 weeks after ovariectomy (OVX) and sham procedures (gonads left intact). The cardioprotective potential of administering chronic G1, the selective agonist to the new G-protein-coupled estrogen receptor (GPER), was further evaluated in old rats (Old-OVX+G1) versus age-matched, vehicle-treated OVX and gonadal intact rats. Advanced age and estrogen loss led to decreases in myocardial relaxation and elevations in filling pressure, in part, due to reductions in phosphorylated phospholamban and increases in cardiac collagen deposition. Eight weeks of G-protein-coupled estrogen receptor activation in Old-OVX+G1 rats reversed the adverse effects of age and estrogen loss on myocardial relaxation through increases in sarcoplasmic reticulum Ca2+ ATPase expression and reductions in interstitial fibrosis. These findings may explain the preponderance of heart failure with preserved ejection fraction in older postmenopausal women and provide a promising, late-life therapeutic target to reverse or halt the progression of left ventricular diastolic dysfunction.
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Affiliation(s)
- Allan K Alencar
- Department of Anesthesiology, Wake Forest School of Medicine, Winston-Salem, North Carolina.,Programa de Pesquisa em Desenvolvimento de Fármacos, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Jaqueline S da Silva
- Programa de Pesquisa em Desenvolvimento de Fármacos, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Marina Lin
- Department of Anesthesiology, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Ananssa M Silva
- Programa de Pesquisa em Desenvolvimento de Fármacos, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Xuming Sun
- Department of Anesthesiology, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Carlos M Ferrario
- Department of Internal Medicine, Section on Nephrology, Wake Forest School of Medicine, Winston-Salem, North Carolina.,Department of Surgery, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Cheping Cheng
- Department of Internal Medicine, Section on Cardiovascular Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Roberto T Sudo
- Programa de Pesquisa em Desenvolvimento de Fármacos, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Gisele Zapata-Sudo
- Programa de Pesquisa em Desenvolvimento de Fármacos, Instituto de Ciências Biomédicas, Universidade Federal do Rio de Janeiro, Rio de Janeiro, Brazil
| | - Hao Wang
- Department of Anesthesiology, Wake Forest School of Medicine, Winston-Salem, North Carolina.,Department of Internal Medicine, Section on Molecular Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina
| | - Leanne Groban
- Department of Anesthesiology, Wake Forest School of Medicine, Winston-Salem, North Carolina. .,Department of Internal Medicine, Section on Molecular Medicine, Wake Forest School of Medicine, Winston-Salem, North Carolina.,The Hypertension and Vascular Research Center, Wake Forest School of Medicine, Winston-Salem, North Carolina.,The Sticht Center on Aging, Wake Forest School of Medicine, Winston-Salem, North Carolina
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14
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Assessment of estrogenic potential of diethyl phthalate in female reproductive system involving both genomic and non-genomic actions. Reprod Toxicol 2014; 49:12-26. [DOI: 10.1016/j.reprotox.2014.06.008] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2013] [Revised: 06/09/2014] [Accepted: 06/23/2014] [Indexed: 11/18/2022]
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15
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Marty MS, O'Connor JC. Key learnings from the Endocrine Disruptor Screening Program (EDSP) Tier 1 rodent uterotrophic and Hershberger assays. ACTA ACUST UNITED AC 2014; 101:63-79. [PMID: 24515841 PMCID: PMC4309517 DOI: 10.1002/bdrb.21098] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2013] [Accepted: 01/08/2014] [Indexed: 11/18/2022]
Abstract
In 2009, companies began screening compounds using the US Environmental Protection Agency's Endocrine Disruptor Screening Program (EDSP). EDSP has two tiers: Tier 1 includes 11 assays to identify compounds with potential endocrine activity. This article describes two laboratories' experiences conducting Tier 1 uterotrophic and Hershberger assays. The uterotrophic assay detects estrogen receptor agonists through increases in uterine weight. The advantages of the uterotrophic rat models (immature vs. adult ovariectomized) and exposure routes are discussed. Across 29 studies, relative differences in uterine weights in the vehicle control group and 17α-ethynylestradiol–positive control group were reasonably reproducible. The Hershberger assay detects androgen receptor (AR) agonists, antagonists, and 5α-reductase inhibitors through changes in accessory sex tissue (AST) weights. Across 23 studies, AST weights were relatively reproducible for the vehicle groups (baseline), testosterone propionate (TP) groups (androgenic response), and flutamide + TP groups (antiandrogenic response). In one laboratory, one and four compounds were positive in the androgenic and antiandrogenic portions of the assay, respectively. Each compound was also positive for AR binding. In the other laboratory, three compounds showed potential antiandrogenic activity, but each compound was negative for AR binding and did not fit the profile for 5α-reductase inhibition. These compounds induced hepatic enzymes that enhanced testosterone metabolism/clearance, resulting in lower testosterone and decreased capacity to maintain AST weights. The Hershberger androgenic and antiandrogenic performance criteria were generally attainable. Overall, the uterotrophic and Hershberger assays were easily adopted and function as described for EDSP screening, although the mode of action for positive results may not be easily determined.
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Affiliation(s)
- M Sue Marty
- Toxicology & Environmental Research and Consulting, The Dow Chemical Company, Midland, Michigan
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16
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Bang DY, Kyung M, Kim MJ, Jung BY, Cho MC, Choi SM, Kim YW, Lim SK, Lim DS, Won AJ, Kwack SJ, Lee Y, Kim HS, Lee BM. Human Risk Assessment of Endocrine-Disrupting Chemicals Derived from Plastic Food Containers. Compr Rev Food Sci Food Saf 2012. [DOI: 10.1111/j.1541-4337.2012.00197.x] [Citation(s) in RCA: 72] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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17
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Meier S, Morton HC, Andersson E, Geffen AJ, Taranger GL, Larsen M, Petersen M, Djurhuus R, Klungsøyr J, Svardal A. Low-dose exposure to alkylphenols adversely affects the sexual development of Atlantic cod (Gadus morhua): acceleration of the onset of puberty and delayed seasonal gonad development in mature female cod. AQUATIC TOXICOLOGY (AMSTERDAM, NETHERLANDS) 2011; 105:136-150. [PMID: 21722617 DOI: 10.1016/j.aquatox.2011.06.003] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2011] [Revised: 05/24/2011] [Accepted: 06/02/2011] [Indexed: 05/31/2023]
Abstract
Produced water (PW), a by-product of the oil-production process, contains large amount of alkylphenols (APs) and other harmful oil compounds. In the last 20 years, there have been increasing concerns regarding the environmental impact of large increases in the amounts of PW released into the North Sea. We have previously shown that low levels of APs can induce disruption of the endocrine and reproductive systems of Atlantic cod (Gadus morhua). The aims of this follow-up study were to: (i) identify the lowest observable effect concentration of APs; (ii) study the effects of exposure to real PW, obtained from a North Sea oil-production platform; and (iii) study the biological mechanism of endocrine disruption in female cod. Fish were fed with feed paste containing several concentrations of four different APs (4-tert-butylphenol, 4-n-pentylphenol, 4-n-hexylphenol and 4-n-heptylphenol) or real PW for 20 weeks throughout the normal period of vitellogenesis in Atlantic cod from October to January. Male and female cod, exposed to AP and PW, were compared to unexposed fish and to fish fed paste containing 17β-oestradiol (E(2)). Approximately 60% of the females and 96% of the males in the unexposed groups were mature at the end of the experiment. Our results show that exposure to APs and E(2) have different effects depending on the developmental stage of the fish. We observed that juvenile females are advanced into puberty and maturation, while gonad development was delayed in both maturing females and males. The AP-exposed groups contained increased numbers of mature females, and significant differences between the untreated group and the AP-treated groups were seen down to a dose of 4 μg AP/kg body weight. In the high-dose AP and the E(2) exposed groups, all females matured and no juveniles were seen. These results suggest that AP-exposure can affect the timing of the onset of puberty in fish even at extremely low concentrations. Importantly, similar effects were not seen in the fish that were exposed to real PW.
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18
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Sato T, Saito H, Uchiyama T, Fujimoto Y, Katase T, Kai O. Effects of synthetic para-nonylphenol isomers administered chronically throughout pregnancy and lactation on reproductive system of mouse pups. Arch Toxicol 2009; 83:1097-108. [DOI: 10.1007/s00204-009-0464-5] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2009] [Accepted: 08/20/2009] [Indexed: 01/05/2023]
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19
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Kim KB, Kim SH, Um SY, Chung MW, Oh JS, Jung SC, Kim TS, Moon HJ, Han SY, Oh HY, Lee BM, Choi KH. Metabolomics approach to risk assessment: methoxyclor exposure in rats. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2009; 72:1352-1368. [PMID: 20077207 DOI: 10.1080/15287390903212550] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The primary objective of this study was to develop exposure biomarkers that "correlate with the endocrine-disrupting effects induced by methoxyclor (MTC), an organochlorine pesticide, using" urinary (1)H nuclear magnetic resonance (NMR) spectral data. Exposure biomarkers play an important role in risk assessment. MTC is an environmental endocrine disruptor with estrogenic, anti-estrogenic, and anti-androgenic properties. A new approach of proton nuclear magnetic resonance ((1)H NMR) urinalysis using pattern recognition was proposed for exposure biomarkers of MTC in female rats. The endocrine disruptor was expected to induce estrogenic effects in a dose dependent manner which, was confirmed by the uterotrophic assay. MTC [50, 100, or 200 m g/kg/d, orally (p.o.) or subcutaneously (s.c.)] was administered to ovariectomized female Sprague-Dawley (SD) rats for 3 d consecutively and urine was collected every 24 h. The animals were sacrificed 24 h after the last dose. All animals treated orally with MTC showed a significant increase in uterine and vaginal weight at all doses. However, in the s.c. route, only a high dose of 200 mg MTC/kg induced a significant increase in uterine and vaginal weight. (1)H NMR spectroscopy revealed evident separate clustering between pre- and post-treatment groups using global metabolic profiling through principal component analysis (PCA) and partial least square (PLS) discrimination analysis (DA) after different exposure routes. With targeted profiling, the endogenous metabolites of acetate, alanine, benzoate, lactate, and glycine were selected as putative exposure biomarkers for MTC. Data suggest that the proposed putative exposure biomarkers may be useful in a risk assessment of the endocrine-disrupting effects produced by MTC.
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Affiliation(s)
- Kyu-Bong Kim
- Korea Food and Drug Administration, Korea Food and Drug Administration, Seoul, South Korea
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20
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Kwack SJ, Kim KB, Kim HS, Yoon KS, Lee BM. Risk assessment of soybean-based phytoestrogens. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2009; 72:1254-61. [PMID: 20077194 DOI: 10.1080/15287390903212212] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Koreans generally consume high quantities of soybean-based foods that contain a variety of phytoestrogens, such as, daidzein, zenistein, and biochalin A. However, phytoestrogens are considered to be potential endocrine-disrupting chemicals (EDC), which interfere with the normal function of the hormonal and reproductive systems. Therefore, dietary exposure to soybean-based phytoestrogens is of concern for Koreans, and comparative dietary risk assessments are required between Japanese (high consumers) versus Americans (low consumers). In this study, a relative risk assessment was conducted based upon daily intake levels of soybean-based foods and phytoestrogens in a Korean cohort, and the risks of photoestrogens were compared with those posed by estradiol and other EDC. Koreans approximately 30-49 yr of age consume on average a total of 135.2 g/d of soy-based foods including soybean, soybean sauce, soybean paste, and soybean oil, and 0.51 mg/kg body weight (bw)/d of phytoestrogens such as daidzein and genistein. Using estimated daily intakes (EDI) and estrogenic potencies (EP), margins of safety (MOS) were calculated where 0.05 is for estradiol (MOS value <1, considered to exert a positive estrogenic effect); thus, MOS values of 1.89 for Japanese, 1.96 for Koreans, and 5.55 for Americans indicate that consumption of soybean-based foods exerted no apparent estrogenic effects, as all MOS values were all higher than 1. For other synthetic EDC used as reference values, MOS values were dieldrin 27, nonylphenol 250, butyl benzyl phthalate 321, bisphenol A 1000, biochanin A 2203, and coumesterol 2898. These results suggest that dietary exposure to phytoestrogens, such as daidzein and genistein, poses a relatively higher health risk for humans than synthetic EDC, although MOS values were all greater than 1.
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Affiliation(s)
- Seung Jun Kwack
- Department of Toxicological Research, National Institute of Toxicological Research, Seoul, Korea
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21
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Chapin RE, Adams J, Boekelheide K, Gray LE, Hayward SW, Lees PSJ, McIntyre BS, Portier KM, Schnorr TM, Selevan SG, Vandenbergh JG, Woskie SR. NTP-CERHR expert panel report on the reproductive and developmental toxicity of bisphenol A. ACTA ACUST UNITED AC 2008; 83:157-395. [PMID: 18613034 DOI: 10.1002/bdrb.20147] [Citation(s) in RCA: 301] [Impact Index Per Article: 18.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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22
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Willhite CC, Ball GL, McLellan CJ. Derivation of a bisphenol A oral reference dose (RfD) and drinking-water equivalent concentration. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART B, CRITICAL REVIEWS 2008; 11:69-146. [PMID: 18188738 DOI: 10.1080/10937400701724303] [Citation(s) in RCA: 108] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Human exposure to bisphenol A (BPA) is due to that found in the diet, and BPA and its metabolites were detected at parts per billion (or less) concentrations in human urine, milk, saliva, serum, plasma, ovarian follicular fluid, and amniotic fluid. Adverse health effects in mice and rats may be induced after parenteral injection or after massive oral doses. Controlled ingestion trials in healthy adult volunteers with 5 mg d16-BPA were unable to detect parent BPA in plasma despite exquisitely sensitive (limit of detection = 6 nM) methods, but by 96 h 100% of the administered dose was recovered in urine as the glucuronide. The extensive BPA glucuronidation following ingestion is not seen after parenteral injection; only the parent BPA binds plasma proteins and estrogen receptors (ER). The hypothesis that BPA dose-response may be described by a J- or U-shape curve was not supported by toxicogenomic data collected in fetal rat testes and epididymes (after repeated parenteral exposure at 2-400,000 microg/kg-d), where a clear monotonic dose-response both in the numbers of genes and magnitude of individual gene expression was evident. There is no clear indication from available data that the BPA doses normally consumed by humans pose an increased risk for immunologic or neurologic disease. There is no evidence that BPA poses a genotoxic or carcinogenic risk and clinical evaluations of 205 men and women with high-performance liquid chromatography (HPLC)-verified serum or urinary BPA conjugates showed (1) no objective signs, (2) no changes in reproductive hormones or clinical chemistry parameters, and (3) no alterations in the number of children or sons:daughters ratio. Results of benchmark dose (BMD10 and BMDL10) calculations and no-observed-adverse-effect level (NOAEL) inspections of all available and reproducible rodent studies with oral BPA found BMD and NOAEL values all greater than the 5 mg/kg-d NOAELs from mouse and rat multigeneration reproduction toxicity studies. While allometric and physiologically based pharmacokinetic (PBPK) models were constructed for interspecies scaling of BPA and its interaction with ER, multigeneration feeding studies with BPA at doses spanning 5 orders of magnitude failed to identify signs of developmental toxicity or adverse changes in reproductive tract tissues; the 5-mg/kg-d NOAELs identified for systemic toxicity in rats and mice were less than the oral NOAELs for reproductive toxicity. Thus, it is the generalized systemic toxicity of ingested BPA rather than reproductive, immunologic, neurobehavioral, or genotoxic hazard that represents the point of departure. Using U.S. Environmental Protection Agency (EPA) uncertainty factor guidance and application of a threefold database uncertainty factor (to account for the fact that the carcinogenic potential of transplacental BPA exposure has yet to be fully defined and comprehensive neurobehavioral and immunotoxicologic evaluations of BPA by relevant routes and at relevant doses have yet to be completed) to the administered dose NOAEL results in an oral RfD of 0.016 mg/kg-d. Assuming the 70-kg adult consumes 2 L of water each day and adopting the default 20% U.S. EPA drinking water relative source contribution yields a 100 microg/L BPA total allowable concentration (TAC).
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Affiliation(s)
- Calvin C Willhite
- Department of Toxic Substances Control, State of California, Berkeley, California, USA
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Wuttke W, Jarry H, Seidlová-Wuttke D. Isoflavones--safe food additives or dangerous drugs? Ageing Res Rev 2007; 6:150-88. [PMID: 17604235 DOI: 10.1016/j.arr.2007.05.001] [Citation(s) in RCA: 87] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2007] [Revised: 04/26/2007] [Accepted: 05/02/2007] [Indexed: 01/12/2023]
Abstract
The sales volume of products containing isoflavone has increased since the publication of the Women's Health Initiative. The many apparently contradictory results published on the effects of isoflavones on a variety of estrogen-regulated organs point to both beneficial as well as adverse effects on human health. It is of particular importance that psychovegetative climacteric complaints such as hot flushes are, if at all, only slightly influenced by isoflavones. The substances appear to have weak anti-osteoporotic effect. Their anti-atherosclerotic action is debatable, as not all authors find any beneficial effect on lipids. Most importantly, there is dispute as to whether isoflavones derived from soy or red clover have negative, positive or any effect at all on the mammary gland or endometrium. It is beyond any doubt that soy products may have cancer preventing properties in a variety of organs including the mammary gland. However, these properties may only be exerted if the developing organ was under the influence of isoflavones during childhood and puberty. This may also explain the often quoted "Japanese Phenomenon", the fact that breast cancer occurs to a lesser extent in Japanese women. When administered to isoflavone "inexperienced" women at the time of menopause, the phytoestrogens appear to share the same effects as estrogen used in classical preparations for hormone replacement therapy, i.e. they may stimulate the proliferation of endometrial and mammary gland tissue with at present unknown and unpredictable risk to these organs. Therefore, the following question arises for the clinician: Why should soy or red clover products containing isoflavone be recommended, if the positive effects are only negligible but the adverse effects serious?
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Affiliation(s)
- Wolfgang Wuttke
- Department of Clinical and Experimental Endocrinology, University of Goettingen, Robert-Koch-Str. 40, 37075 Goettingen, Germany.
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24
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Richter CA, Birnbaum LS, Farabollini F, Newbold RR, Rubin BS, Talsness CE, Vandenbergh JG, Walser-Kuntz DR, vom Saal FS. In vivo effects of bisphenol A in laboratory rodent studies. Reprod Toxicol 2007; 24:199-224. [PMID: 17683900 PMCID: PMC2151845 DOI: 10.1016/j.reprotox.2007.06.004] [Citation(s) in RCA: 814] [Impact Index Per Article: 47.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2007] [Revised: 06/06/2007] [Accepted: 06/11/2007] [Indexed: 12/25/2022]
Abstract
Concern is mounting regarding the human health and environmental effects of bisphenol A (BPA), a high-production-volume chemical used in synthesis of plastics. We have reviewed the growing literature on effects of low doses of BPA, below 50 mg/(kg day), in laboratory exposures with mammalian model organisms. Many, but not all, effects of BPA are similar to effects seen in response to the model estrogens diethylstilbestrol and ethinylestradiol. For most effects, the potency of BPA is approximately 10-1000-fold less than that of diethylstilbestrol or ethinylestradiol. Based on our review of the literature, a consensus was reached regarding our level of confidence that particular outcomes occur in response to low dose BPA exposure. We are confident that adult exposure to BPA affects the male reproductive tract, and that long lasting, organizational effects in response to developmental exposure to BPA occur in the brain, the male reproductive system, and metabolic processes. We consider it likely, but requiring further confirmation, that adult exposure to BPA affects the brain, the female reproductive system, and the immune system, and that developmental effects occur in the female reproductive system.
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Affiliation(s)
| | | | | | - Retha R. Newbold
- National Institute of Environmental Health Sciences, NIH, DHHS, Research Triangle Park, NC
| | - Beverly S. Rubin
- Department of Anatomy and Cell Biology, Tufts University School of Medicine, Boston, MA
| | - Chris E. Talsness
- Institute of Clinical Pharmacology and Toxicology, Charité Universitätsmedizin Berlin, Berlin, Germany
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25
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Bruce-Keller AJ, Dimayuga FO, Reed JL, Wang C, Angers R, Wilson ME, Dimayuga VM, Scheff SW. Gender and Estrogen Manipulation Do Not Affect Traumatic Brain Injury in Mice. J Neurotrauma 2007; 24:203-15. [PMID: 17263684 DOI: 10.1089/neu.2006.0163] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
As epidemiological data have suggested that female patients may have improved clinical prognoses following traumatic brain injury (TBI) compared to males, we designed experiments to determine the role of gender and estrogen in TBI-induced brain injury and inflammation in rodents. To this end, male and female C57Bl/6 mice were separated into the following four groups: intact males, intact females with vehicle supplementation, ovariectomized females with vehicle supplementation, and ovariectomized females with estrogen supplementation. All mice were subjected to a controlled cortical impact model of TBI, and cortical injury, hippocampal degeneration, microglial activation, and brain cytokine expression were analyzed after injury. Additionally, the spleens were harvested and cytokine release from cultured splenic cells was measured in response to specific stimuli. Data indicate that TBI-induced cortical and hippocampal injury, as well as injury-related microglial activation were not significantly affected by gender or estrogen manipulation. Conversely, brain levels of MCP-1 and IL-6 were significantly increased in males and intact females following TBI, but not in female mice that had been ovariectomized and supplemented with either estrogen or vehicle. Evaluation of splenic responses showed that the spleen was only moderately affected by TBI, and furthermore that spleens isolated from mice that had been given estrogen supplementation showed significantly higher release of the anti-inflammatory cytokine IL-4, regardless of the presence of absence of TBI. Overall, these data indicate that while estrogen can modulate immune responses, and indeed can predispose splenic responses towards and anti-inflammatory phenotype, these effects do not translate to decreased brain injury or inflammation following TBI in mice.
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26
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Rozman KK, Bhatia J, Calafat AM, Chambers C, Culty M, Etzel RA, Flaws JA, Hansen DK, Hoyer PB, Jeffery EH, Kesner JS, Marty S, Thomas JA, Umbach D. NTP-CERHR expert panel report on the reproductive and developmental toxicity of genistein. BIRTH DEFECTS RESEARCH. PART B, DEVELOPMENTAL AND REPRODUCTIVE TOXICOLOGY 2006; 77:485-638. [PMID: 17186522 PMCID: PMC2020434 DOI: 10.1002/bdrb.20087] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Karl K Rozman
- Department of Pharmacology and Toxicology, University of Kansas Medical Center, Kansas City, KS, USA
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