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Raja A, Costa P, Blum JL, Doherty-Lyons S, Igbo JK, Meltzer G, Orem W, McCawley M, Zelikoff JT. In vivo exposure to electronic waste (e-waste) leachate and hydraulic fracturing fluid adversely impacts the male reproductive system. Reprod Toxicol 2024; 124:108533. [PMID: 38160783 PMCID: PMC10922462 DOI: 10.1016/j.reprotox.2023.108533] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2023] [Revised: 12/12/2023] [Accepted: 12/27/2023] [Indexed: 01/03/2024]
Abstract
Human health effects can arise from unregulated manual disassembly of electronic waste (e-waste) and/or hydraulic fracturing fluid spills. There is limited literature on the effects of e-waste and hydraulic fracturing wastewater exposure on the male reproductive system. Thus, this proof-of-concept study begins to address the question of how wastewater from two potentially hazardous environmental processes could affect sperm quality. Therefore, three groups of eight-week-old adult mice were exposed (5 d/wk for 6 wks) via a mealworm (Tenebrio molitor and Zophabas morio) feeding route to either: (1) e-waste leachate (50% dilution) from the Alaba Market (Lagos, Nigeria); (2) West Virginia hydraulic fracturing flowback (HFF) fluid (50% dilution); or, (3) deionized water (control). At 24-hours (hr), 3 weeks (wk), or 9-wk following the 6-wk exposure period, cohorts of mice were necropsied and adverse effects/persistence on the male reproductive system were examined. Ingestion of e-waste leachate or HFF fluid decreased number and concentration of sperm and increased both chromatin damage and numbers of morphological abnormalities in the sperm when compared to control mice. Levels of serum testosterone were reduced post-exposure (3- and 9-wk) in mice exposed to e-waste leachate and HFF when compared to time-matched controls, indicating the long-term persistence of adverse effects, well after the end of exposure. These data suggest that men living around or working in vicinity of either e-waste or hydraulic fracturing could face harmful effects to their reproductive health. From both a human health and economic standpoint, development of prevention and intervention strategies that are culturally relevant and economically sensitive are critically needed to reduce exposure to e-waste and HFF-associated toxic contaminants.
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Affiliation(s)
- Amna Raja
- Division of Environmental Medicine, New York University School of Medicine, New York, NY, USA
| | - Patricia Costa
- Division of Environmental Medicine, New York University School of Medicine, New York, NY, USA
| | - Jason L Blum
- Division of Environmental Medicine, New York University School of Medicine, New York, NY, USA; Product Safety Labs, Dayton, NJ, USA
| | - Shannon Doherty-Lyons
- Division of Environmental Medicine, New York University School of Medicine, New York, NY, USA
| | - Juliet K Igbo
- Department of Biological Oceanography, Nigerian Institute for Oceanography and Marine Research, Lagos, Nigeria
| | - Gabriella Meltzer
- Departments of Epidemiology and Environmental Health Sciences, Columbia University Mailman School of Public Health, New York, NY, USA
| | - William Orem
- United States Geological Survey, Reston, VA, USA
| | - Michael McCawley
- Department of Occupational & Environmental Health Sciences, School of Public Health, West Virginia University, South Morgantown, WV, USA
| | - Judith T Zelikoff
- Division of Environmental Medicine, New York University School of Medicine, New York, NY, USA.
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2
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Basal WT, Issa AM, Abdelalem O, Omar AR. Salvia officinalis restores semen quality and testicular functionality in cadmium-intoxicated male rats. Sci Rep 2023; 13:20808. [PMID: 38012170 PMCID: PMC10682483 DOI: 10.1038/s41598-023-45193-1] [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: 08/30/2023] [Accepted: 10/17/2023] [Indexed: 11/29/2023] Open
Abstract
The present study investigated the potential ability of Salvia officinalis, one of the oldest medicinal plants, to protect male rats against cadmium reproductive toxicity. Twenty-eight healthy male rats were randomly allocated into four groups (n = 7); control, Salvia-extract treated group, cadmium treated group and a group treated with both Cd and Salvia. Administration of cadmium reduced the relative testis to body weight and significantly affected sperm parameters by decreasing motility, viability, count and increasing morphological aberrations. Comet assay was used to detect DNA fragmentation in sperms of the rats exposed to Cd. Serum levels of testosterone T, follicle stimulating hormone FSH, and luteinizing hormone LH were significantly decreased. The biochemical analysis of testicular tissue showed a significant rise in Malondialdehyde MDA level coupled with a decrease in the activity of antioxidant enzymes (superoxide dismutase SOD, glutathione peroxidase GPx and catalase CAT). The histological examination of testis sections after Cd administration revealed severe degeneration of spermatogenic cells. Seminiferous tubules were filled with homogenous eosinophilic fluid associated with atrophy of other seminiferous tubules. Co-treatment with the Salvia officinalis extract restored the oxidative enzymes activities and decreased the formation of lipid peroxidation byproduct, which in turn ameliorated the effect of Cd on sperm parameters, DNA damage and testis histopathology. Taken together, it can be concluded that the synergistic antioxidant and radical savaging activities of Salvia officinalis prevented the effect of Cd on semen quality, sperm DNA damage, along with the oxidative stress and histological abnormalities in the testis tissues.
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Affiliation(s)
- Wesam T Basal
- Department of Zoology, Faculty of Science, Cairo University, Giza, 12613, Egypt.
| | - Aliaa M Issa
- Department of Zoology, Faculty of Science, Cairo University, Giza, 12613, Egypt
| | - Omnia Abdelalem
- Department of Zoology, Faculty of Science, Cairo University, Giza, 12613, Egypt
| | - Amel R Omar
- Department of Zoology, Faculty of Science, Cairo University, Giza, 12613, Egypt
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3
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Lahimer M, Abou Diwan M, Montjean D, Cabry R, Bach V, Ajina M, Ben Ali H, Benkhalifa M, Khorsi-Cauet H. Endocrine disrupting chemicals and male fertility: from physiological to molecular effects. Front Public Health 2023; 11:1232646. [PMID: 37886048 PMCID: PMC10598475 DOI: 10.3389/fpubh.2023.1232646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Accepted: 09/18/2023] [Indexed: 10/28/2023] Open
Abstract
The deleterious effects of chemical or non-chemical endocrine disruptors (EDs) on male fertility potential is well documented but still not fully elucidated. For example, the detection of industrial chemicals' metabolites in seminal plasma and follicular fluid can affect efficiency of the gametogenesis, the maturation and competency of gametes and has guided scientists to hypothesize that endocrine disrupting chemicals (EDCs) may disrupt hormonal homoeostasis by leading to a wide range of hormonal control impairments. The effects of EDCs exposure on reproductive health are highly dependent on factors including the type of EDCs, the duration of exposure, individual susceptibility, and the presence of other co-factors. Research and scientists continue to study these complex interactions. The aim of this review is to summarize the literature to better understand the potential reproductive health risks of EDCs in France.
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Affiliation(s)
- Marwa Lahimer
- ART and Reproductive Biology Laboratory, University Hospital and School of Medicine, CHU Sud, Amiens, France
- PERITOX-(UMR-I 01), UPJV/INERIS, UPJV, CURS, Chemin du Thil, Amiens, France
- Exercise Physiology and Physiopathology: from Integrated to Molecular “Biology, Medicine and Health” (Code: LR19ES09), Sousse, Tunisia
| | - Maria Abou Diwan
- PERITOX-(UMR-I 01), UPJV/INERIS, UPJV, CURS, Chemin du Thil, Amiens, France
| | - Debbie Montjean
- Fertilys, Centres de Fertilité, Laval and Brossard, QC, Canada
| | - Rosalie Cabry
- ART and Reproductive Biology Laboratory, University Hospital and School of Medicine, CHU Sud, Amiens, France
- PERITOX-(UMR-I 01), UPJV/INERIS, UPJV, CURS, Chemin du Thil, Amiens, France
| | - Véronique Bach
- PERITOX-(UMR-I 01), UPJV/INERIS, UPJV, CURS, Chemin du Thil, Amiens, France
| | - Mounir Ajina
- Service of Reproductive Medicine, University Hospital Farhat Hached, Sousse, Tunisia
| | - Habib Ben Ali
- Laboratory Histology Embryology, Faculty of Medicine Sousse, University of Sousse, Sousse, Tunisia
| | - Moncef Benkhalifa
- ART and Reproductive Biology Laboratory, University Hospital and School of Medicine, CHU Sud, Amiens, France
- PERITOX-(UMR-I 01), UPJV/INERIS, UPJV, CURS, Chemin du Thil, Amiens, France
| | - Hafida Khorsi-Cauet
- ART and Reproductive Biology Laboratory, University Hospital and School of Medicine, CHU Sud, Amiens, France
- PERITOX-(UMR-I 01), UPJV/INERIS, UPJV, CURS, Chemin du Thil, Amiens, France
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4
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Hashimoto K, Odaka H, Ishikawa-Yamauchi Y, Nagata S, Nakamura H, Kimura H, Sato T, Makiyama K, Ogawa T. Culture-space control is effective in promoting haploid cell formation and spermiogenesis in vitro in neonatal mice. Sci Rep 2023; 13:12354. [PMID: 37524742 PMCID: PMC10390558 DOI: 10.1038/s41598-023-39323-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2023] [Accepted: 07/24/2023] [Indexed: 08/02/2023] Open
Abstract
The classical organ culture method, in which tissue is placed at the gas‒liquid interphase, is effective at inducing mouse spermatogenesis. However, due to reginal variations in the supply of oxygen and nutrients within a tissue, the progress of spermatogenesis was observed only in limited areas of a tissue. In addition, haploid cell formation and its differentiation to spermatozoon, i.e. spermiogenesis, were infrequent and inefficient. Here, we show that the polydimethylsiloxane (PDMS)-chip ceiling (PC) method, which ensures a uniform supply of nutrients and oxygen throughout the tissue by pressing it into a thin, flat shape, can provide control over the culture space. We used this method to culture testis tissue from neonatal mice, aged 1 to 4 days, and found that modulating the culture space during the experiment by replacing one chip with another that had a higher ceiling effectively increased tissue growth. This adjustment also induced more efficient spermatogenesis, with the process of spermiogenesis being particularly promoted. Meiotic cells were observed from culture day 14 onward, and haploid cells were confirmed at the end of each experiment. This technique was also shown to be a sensitive assay for testicular toxicity. Culture-space control will be a critical regulation parameter for sophisticated tissue culture experiments.
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Affiliation(s)
- Kiyoshi Hashimoto
- Department of Urology, Graduate School of Medicine, Yokohama City University, Yokohama, Japan
- Department of Regenerative Medicine, Yokohama City University, Yokohama, Japan
| | - Hisakazu Odaka
- Department of Urology, Graduate School of Medicine, Yokohama City University, Yokohama, Japan
- Department of Regenerative Medicine, Yokohama City University, Yokohama, Japan
| | | | - Shino Nagata
- Graduate School of Medical Life Science, Yokohama City University, Yokohama, Japan
| | - Hiroko Nakamura
- Micro/Nano Technology Center, Tokai University, Hiratsuka, Japan
| | - Hiroshi Kimura
- Micro/Nano Technology Center, Tokai University, Hiratsuka, Japan
| | - Takuya Sato
- Department of Regenerative Medicine, Yokohama City University, Yokohama, Japan
| | - Kazuhide Makiyama
- Department of Urology, Graduate School of Medicine, Yokohama City University, Yokohama, Japan
| | - Takehiko Ogawa
- Department of Regenerative Medicine, Yokohama City University, Yokohama, Japan.
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5
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da Cunha de Medeiros P, Nascimento CC, Perobelli JE. Antineoplastic drugs in environmentally relevant concentrations cause endocrine disruption and testicular dysfunction in experimental conditions. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2023; 100:104122. [PMID: 37031830 DOI: 10.1016/j.etap.2023.104122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 04/03/2023] [Accepted: 04/06/2023] [Indexed: 06/15/2023]
Abstract
5-fluorouracil (5-FU) and methotrexate (MTX) are among the most widely consumed antineoplastic drugs worldwide. These drugs are known as emerging pollutants, once after consumption are excreted by feces and/or urine in a mixture of compounds and metabolites, entering the aquatic environment due to low efficiency in drug removal by effluent treatment plants. Considering that these substances may interact with the DNA, causing metabolic and morphological changes, leading to cell death, the present study aimed to investigate the potential impact of a long-term exposure to these antineoplastic drugs in environmentally relevant concentrations, on testicular morphophysiology of rats. Male Wistar rats (70 days old) were distributed into 4 groups (n = 10 / group): control, received only vehicle; MTX, received methotrexate at 10ngL-1 in drinking water; 5-FU received 5-fluorouracil at 10ngL-1 in drinking water; and MTX+ 5FU, received the combination of MTX and 5-FU at 10ngL-1 each. The treatment period was from postnatal day (PND)70 to PND160, when the animals were euthanized for evaluation of testicular toxicity and changes in endocrine signaling. In these experimental conditions, both drugs acted as endocrine disruptors causing cytotoxic effects in the testes of exposed rats, altering the structural pattern of seminiferous tubules and leading to oxidative stress even at environmental concentrations.
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Affiliation(s)
- Paloma da Cunha de Medeiros
- Laboratory of Experimental Toxicology - LATOEX, Universidade Federal de São Paulo, Instituto do Mar, Carvalho de Mendonça, 144, 11070-100 Santos, SP, Brazil
| | - Cinthia C Nascimento
- Department of Biosciences, Universidade Federal de São Paulo, Santos, SP, Brazil
| | - Juliana E Perobelli
- Laboratory of Experimental Toxicology - LATOEX, Universidade Federal de São Paulo, Instituto do Mar, Carvalho de Mendonça, 144, 11070-100 Santos, SP, Brazil.
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6
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Mahgoob AAE, Tousson E, Abd Eldaim MA, Ullah S, Al-Sehemi AG, Algarni H, El Sayed IET. Ameliorative role of chitosan nanoparticles against silver nanoparticle-induced reproductive toxicity in male albino rats. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:17374-17383. [PMID: 36192590 DOI: 10.1007/s11356-022-23312-1] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/17/2022] [Accepted: 09/23/2022] [Indexed: 06/16/2023]
Abstract
This study was designed to evaluate the protective potentials of chitosan nanoparticles (ChNPs) against silver nanoparticle (AgNP)-induced reproductive toxicity in male Wister albino rats. AgNPs, ChNPs, and AgNPs particles coated with ChNPs were characterized by using transmission electron microscope. Control rats were injected interperitoneally with 0.5% aqueous carboxymethyl cellulose. Second group was given ChNPs at a dose 300 mg/kg bwt. Third group was given AgNPs at a dose 50 mg/kg bwt. Fourth group was given AgNPs with chitosan nanoparticles simultaneously. Fifth group was given silver nanoparticles coated with chitosan nanoparticles at a dose 300 mg/kg bwt. TEM showed the formation of AgNPs with average size of 42.7 nm, ChNPs with average size of 33.3 nm, and AgNPs coated with ChNPs with average size of 48.1 nm. AgNPs significantly reduced serum levels of FSH, LH, testosterone and prolactin, sperm count, morphology index, vitality, total motility and progressive motility, the activities of catalase and superoxide dismutase, and the concentration of reduced glutathione in testicular tissues. However, it significantly increased malondialdehyde concentration in testicular tissues, sperm abnormalities, testicular tissue damages, non-progressive motility, and immotile sperms. On the contrast, ChNPs ameliorated AgNP-induced alteration in serum levels of sex hormones, spermogram, and testicular tissue's structure and functions. These results indicated that ChNPs had protective potential against AgNP-induced reproductive toxicity and ChNPs coating AgNPs had more potent protective effect than ChNPs administrated together with AgNPs.
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Affiliation(s)
| | - Ehab Tousson
- Zoology Department, Faculty of Science, Tanta University, Tanta, Egypt
| | - Mabrouk Attia Abd Eldaim
- Department of Biochemistry and Chemistry of Nutrition, Faculty of Veterinary Medicine, Menoufia University, Menoufia, Egypt.
| | - Sami Ullah
- Research Center for Advanced Materials Science (RCAMS), King Khalid University, P.O. Box 9004, Abha, 61413, Saudi Arabia
- Department of Chemistry, College of Science, King Khalid University, P.O. Box 9004, Abha, 61413, Saudi Arabia
| | - Abdullah G Al-Sehemi
- Research Center for Advanced Materials Science (RCAMS), King Khalid University, P.O. Box 9004, Abha, 61413, Saudi Arabia
- Department of Chemistry, College of Science, King Khalid University, P.O. Box 9004, Abha, 61413, Saudi Arabia
| | - Hamed Algarni
- Research Center for Advanced Materials Science (RCAMS), King Khalid University, P.O. Box 9004, Abha, 61413, Saudi Arabia
- Department of Physics, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, Saudi Arabia
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7
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Kang Y, Tan Y, Wang C, Yao B, An K, Liu M, Su J. Antifertility effects of levonorgestrel, quinestrol and their mixture (EP-1) on plateau zokor in the Qinghai-Tibetan Plateau. Integr Zool 2022; 17:1002-1016. [PMID: 35271766 DOI: 10.1111/1749-4877.12642] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The plateau zokor (Eospalax baileyi Thomas, 1911) is a key species in the Qinghai-Tibetan Plateau ecosystem, and fertility control could be an ideal approach to manage populations of this subterranean species. In this laboratory study, we explored the effects of the mixture of levonorgestrel and quinestrol (EP-1, 1:2), quinestrol (E), and levonorgestrel (P) on the reproductive status of plateau zokors. Groups of five animals of each sex were treated with different concentrations of EP-1 (1, 5, and 10 mg/kg), E (0.33, 3.3, and 6.6 mg/kg), and P (0.67, 3.35, and 6.7 mg/kg) by oral gavage over 7 successive days and killed on day 15. Body mass reduction was observed in the EP-1 and E groups. EP-1 and E significantly reduced the weight of testis and epididymis at 10 and 3.3 mg/kg, respectively. Sperm count and motility were significantly reduced by 5 mg/kg EP-1 and 0.33 mg/kg E. The levels of serum testosterone, estradiol, luteinizing hormone, and follicle stimulating hormone were significantly reduced by 5 mg/kg EP-1 and 3.3 mg/kg E. EP-1 and E significantly reduced the uterine and ovarian weights at 10 and 3.3 mg/kg, respectively. In the plateau zokors, treatment with P had no influence on the reproductive status. These data demonstrate that EP-1 and E have an inhibitory effect on a range of reproductive parameters in the plateau zokors. Further assessment is required to determine the effects on breeding and recruitment in enclosure or field experiments. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Yunkun Kang
- College of Grassland Science, Key Laboratory of Grassland Ecosystem (Ministry of Education), Gansu Agricultural University, Lanzhou, 730070, China.,Gansu Agricultural University-Massey University Research Centre for Grassland Biodiversity, Gansu Agricultural University, Lanzhou, 730070, China
| | - Yuchen Tan
- College of Grassland Science, Key Laboratory of Grassland Ecosystem (Ministry of Education), Gansu Agricultural University, Lanzhou, 730070, China.,Gansu Agricultural University-Massey University Research Centre for Grassland Biodiversity, Gansu Agricultural University, Lanzhou, 730070, China
| | - Chan Wang
- College of Grassland Science, Key Laboratory of Grassland Ecosystem (Ministry of Education), Gansu Agricultural University, Lanzhou, 730070, China.,Gansu Agricultural University-Massey University Research Centre for Grassland Biodiversity, Gansu Agricultural University, Lanzhou, 730070, China
| | - Baohui Yao
- College of Grassland Science, Key Laboratory of Grassland Ecosystem (Ministry of Education), Gansu Agricultural University, Lanzhou, 730070, China.,Gansu Agricultural University-Massey University Research Centre for Grassland Biodiversity, Gansu Agricultural University, Lanzhou, 730070, China
| | - Kang An
- College of Grassland Science, Key Laboratory of Grassland Ecosystem (Ministry of Education), Gansu Agricultural University, Lanzhou, 730070, China.,Gansu Agricultural University-Massey University Research Centre for Grassland Biodiversity, Gansu Agricultural University, Lanzhou, 730070, China
| | - Ming Liu
- International Society of Zoological Sciences, Beijing, 100101, China
| | - Junhu Su
- College of Grassland Science, Key Laboratory of Grassland Ecosystem (Ministry of Education), Gansu Agricultural University, Lanzhou, 730070, China.,Gansu Agricultural University-Massey University Research Centre for Grassland Biodiversity, Gansu Agricultural University, Lanzhou, 730070, China
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8
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Couto-Santos F, Viana AGDA, Souza ACF, Dutra AADA, Mendes TADO, Ferreira ATDS, Aguilar JEP, Oliveira LL, Machado-Neves M. Prepubertal arsenic exposure alters phosphoproteins profile, quality, and fertility of epididymal spermatozoa in sexually mature rats. Toxicology 2021; 460:152886. [PMID: 34352348 DOI: 10.1016/j.tox.2021.152886] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2021] [Revised: 07/29/2021] [Accepted: 07/31/2021] [Indexed: 12/20/2022]
Abstract
Arsenic intoxication affects male reproductive parameters of prepubertal rats. Besides, morphological and functional alterations in their testis and epididymis may remain after withdrawal of arsenic insult, causing potential impairment in male fertility during adulthood. In this study, we aimed at analyzing the effect of prepubertal arsenic exposure on the fecundity of epididymal sperm from sexually mature Wistar rats, assessing fertility indexes, sperm parameters, and sperm phosphoproteins content. Male pups on postnatal day (PND) 21 received filtered water (controls, n = 10) and 10 mg L-1 arsenite (n = 10) daily for 30 days. From PND52 to PND81, rats from both groups received filtered water. During this period, the males mated with non-exposed females between PND72 and PND75. Our results showed that sexually mature rats presented low sperm production, epididymal sperm count, motility, and quality after prepubertal arsenic exposure. These findings possibly contributed to the low fertility potential and high preimplantation loss. Epididymal sperm proteome detected 268 proteins, which 170 were found in animals from both control and arsenic groups, 27 proteins were detected only in control animals and 71 proteins only in arsenic-exposed rats. In these animals, SPATA 18 and other five proteins were upregulated, whereas keratin type II cytoskeletal 1 was downregulated (q < 0.1). The results of KEGG pathway analysis demonstrated an enrichment of pathways related to dopaminergic response, adrenergic signaling, protein degradation, and oocyte meiosis in arsenic-exposed animals. Moreover, 26 proteins were identified by phosphoproteomic with different phosphorylation pattern in animals from both groups, but SPATA18 was phosphorylated only in arsenic-exposed animals. We concluded that prepubertal exposure to arsenic is deleterious to sperm quality and male fertility, altering the sperm phosphoproteins profile.
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Affiliation(s)
- Felipe Couto-Santos
- Programa de Pós-Graduação em Biologia Celular e Estrutural, Departamento de Biologia Geral, Universidade Federal de Viçosa, Av. P.H. Rolfs, s/n, Campus Universitário, 36570-900, Viçosa, Minas Gerais, Brazil.
| | - Arabela Guedes de Azevedo Viana
- Programa de Pós-Graduação em Medicina Veterinária, Departamento de Medicina Veterinária, Universidade Federal de Viçosa, Av. P.H. Rolfs, s/n, Campus Universitário, 36570-900, Viçosa, Minas Gerais, Brazil.
| | - Ana Cláudia Ferreira Souza
- Departamento de Biologia Animal, Universidade Federal Rural do Rio de Janeiro, BR-465, Km 7, 23897-000, Seropédica, Rio de Janeiro, Brazil.
| | - Alexandre Augusto de Assis Dutra
- Universidade Federal dos Vales do Jequitinhonha e Mucuri, Rua Cruzeiro 1, Jardim São Paulo, 39803-371, Teófilo Otoni, Minas Gerais, Brazil.
| | - Tiago Antônio de Oliveira Mendes
- Departamento de Bioquímca e Biologia Molecular, Universidade Federal de Viçosa, Av. P.H. Rolfs, s/n, Campus Universitário, 36570-900, Viçosa, Minas Gerais, Brazil.
| | | | - Jonas Enrique Perales Aguilar
- Laboratório de Toxinologia/Plataforma de Proteômica, FIOCRUZ, Av. Brasil 4365, Manguinhos, 21040-900, Rio de Janeiro, Brazil.
| | - Leandro Licursi Oliveira
- Programa de Pós-Graduação em Biologia Celular e Estrutural, Departamento de Biologia Geral, Universidade Federal de Viçosa, Av. P.H. Rolfs, s/n, Campus Universitário, 36570-900, Viçosa, Minas Gerais, Brazil.
| | - Mariana Machado-Neves
- Programa de Pós-Graduação em Biologia Celular e Estrutural, Departamento de Biologia Geral, Universidade Federal de Viçosa, Av. P.H. Rolfs, s/n, Campus Universitário, 36570-900, Viçosa, Minas Gerais, Brazil; Programa de Pós-Graduação em Medicina Veterinária, Departamento de Medicina Veterinária, Universidade Federal de Viçosa, Av. P.H. Rolfs, s/n, Campus Universitário, 36570-900, Viçosa, Minas Gerais, Brazil.
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9
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Garcia MS, Orcini WA, Peruquetti RL, Perobelli JE. New approach for reproductive toxicity assessment: chromatoid bodies as a target for methylmercury and polychlorinated biphenyls in prepubertal male rats. Reprod Fertil Dev 2021; 32:914-922. [PMID: 32586421 DOI: 10.1071/rd19447] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2019] [Accepted: 05/04/2020] [Indexed: 11/23/2022] Open
Abstract
This study investigated the reproductive toxicity of methylmercury (MeHg) and Aroclor (Sigma-Aldrich), alone or in combination, following exposure of prepubertal male rats considering the chromatoid body (CB) as a potential target. The CB is an important molecular regulator of mammalian spermatogenesis, primarily during spermatid cytodifferentiation. Male Wistar rats were exposed to MeHg and/or Aroclor , according the following experimental design: control group, which was administered in corn oil (vehicle) only; MeHg-treated group, which was administered 0.5mg kg-1 day-1 MeHg; Aroclor-treated group, which was administered 1mg kg-1 day-1 Aroclor; Mix-LD, group which was administered a low-dose mixture of MeHg (0.05mg kg-1 day-1) and Aroclor (0.1mg kg-1 day-1); and Mix-HD group, which was administered a high-dose mixture of MeHg (0.5mg kg-1 day-1) and Aroclor (1.0mg kg-1 day-1). MeHg was diluted in distilled water and Aroclor was made up in corn oil (volume 1mL kg-1). Rats were administered the different treatments from PND23 to PND53 by gavage, . The morphophysiology of CBs was analysed, together with aspects of steroid hormones status and regulation, just after the last treatment on PND53. In addition, the long-term effects on sperm parameters were assessed in adult animals. MeHg exposure increased mouse VASA homologue (MVH) protein levels in seminiferous tubules, possibly affecting the epigenetic status of germ cells. Aroclor produced morphological changes to CB assembly, which may explain the observed morphological defects to the sperm flagellum and the consequent decrease in sperm motility. There were no clear additive or synergistic effects between MeHg and Aroclor when administered in combination. In conclusion, this study demonstrates that MeHg and Aroclor have independent deleterious effects on the developing testis, causing molecular and morphological changes in CBs. To the best of our knowledge, this is the first study to show that CBs are targets for toxic agents.
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Affiliation(s)
- M S Garcia
- School of Health Sciences, Sagrado Coração University, Rua Irmã Arminda, 10-50, Jd., Brasil, 17011-160, Bauru, São Paulo, Brazil; and Experimental Toxicology Laboratory, Department of Marine Sciences, Federal University of São Paulo, Campus Baixada Santista, Rua Dr Carvalho de Mendonça, 144, Encruzilhada, 11070-102 Santos, SP, Brazil
| | - W A Orcini
- Molecular Biology and Cytogenetics Laboratory, Sagrado Coração University, Rua Irmã Arminda, 10-50, Jd., Brasil, 17011-160, Bauru, São Paulo, Brazil
| | - R L Peruquetti
- School of Health Sciences, Sagrado Coração University, Rua Irmã Arminda, 10-50, Jd., Brasil, 17011-160, Bauru, São Paulo, Brazil; and Molecular Biology and Cytogenetics Laboratory, Sagrado Coração University, Rua Irmã Arminda, 10-50, Jd., Brasil, 17011-160, Bauru, São Paulo, Brazil; and Office of the Associate Dean of Graduate Studies and Research, Sagrado Coração University, Rua Irmã Arminda, 10-50, Jd., Brasil, 17011-160, Bauru, São Paulo, Brazil
| | - J E Perobelli
- Experimental Toxicology Laboratory, Department of Marine Sciences, Federal University of São Paulo, Campus Baixada Santista, Rua Dr Carvalho de Mendonça, 144, Encruzilhada, 11070-102 Santos, SP, Brazil; and Corresponding author.
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Weaver JA, Beverly BEJ, Keshava N, Mudipalli A, Arzuaga X, Cai C, Hotchkiss AK, Makris SL, Yost EE. Hazards of diethyl phthalate (DEP) exposure: A systematic review of animal toxicology studies. ENVIRONMENT INTERNATIONAL 2020; 145:105848. [PMID: 32958228 PMCID: PMC7995140 DOI: 10.1016/j.envint.2020.105848] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2019] [Revised: 05/05/2020] [Accepted: 05/06/2020] [Indexed: 05/18/2023]
Abstract
BACKGROUND Diethyl phthalate (DEP) is widely used in many commercially available products including plastics and personal care products. DEP has generally not been found to share the antiandrogenic mode of action that is common among other types of phthalates, but there is emerging evidence that DEP may be associated with other types of health effects. OBJECTIVE To inform chemical risk assessment, we performed a systematic review to identify and characterize outcomes within six broad hazard categories (male reproductive, female reproductive, developmental, liver, kidney, and cancer) following exposure of nonhuman mammalian animals to DEP or its primary metabolite, monoethyl phthalate (MEP). METHODS A literature search was conducted in online scientific databases (PubMed, Web of Science, Toxline, Toxcenter) and Toxic Substances Control Act Submissions, augmented by review of online regulatory sources as well as forward and backward searches. Studies were selected for inclusion using PECO (Population, Exposure, Comparator, Outcome) criteria. Studies were evaluated using criteria defined a priori for reporting quality, risk of bias, and sensitivity using a domain-based approach. Evidence was synthesized by outcome and life stage of exposure, and strength of evidence was summarized into categories of robust, moderate, slight, indeterminate, or compelling evidence of no effect, using a structured framework. RESULTS Thirty-four experimental studies in animals were included in this analysis. Although no effects on androgen-dependent male reproductive development were observed following gestational exposure to DEP, there was evidence including effects on sperm following peripubertal and adult exposures, and the overall evidence for male reproductive effects was considered moderate. There was moderate evidence that DEP exposure can lead to developmental effects, with the major effect being reduced postnatal growth following gestational or early postnatal exposure; this generally occurred at doses associated with maternal effects, consistent with the observation that DEP is not a potent developmental toxicant. The evidence for liver effects was considered moderate based on consistent changes in relative liver weight at higher dose levels; histopathological and biochemical changes indicative of hepatic effects were also observed, but primarily in studies that had significant concerns for risk of bias and sensitivity. The evidence for female reproductive effects was considered slight based on few reports of statistically significant effects on maternal body weight gain, organ weight changes, and pregnancy outcomes. Evidence for cancer and effects on kidney were judged to be indeterminate based on limited evidence (i.e., a single two-year cancer bioassay) and inconsistent findings, respectively. CONCLUSIONS These results suggest that DEP exposure may induce androgen-independent male reproductive toxicity (i.e., sperm effects) as well as developmental toxicity and hepatic effects, with some evidence of female reproductive toxicity. More research is warranted to fully evaluate these outcomes and strengthen confidence in this database.
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Affiliation(s)
- James A Weaver
- U.S. Environmental Protection Agency, Center for Public Health and Environmental Assessment, Research Triangle Park, NC, United States
| | - Brandiese E J Beverly
- U.S. Environmental Protection Agency, Center for Public Health and Environmental Assessment, Research Triangle Park, NC, United States
| | - Nagalakshmi Keshava
- U.S. Environmental Protection Agency, Center for Public Health and Environmental Assessment, Research Triangle Park, NC, United States
| | - Anuradha Mudipalli
- U.S. Environmental Protection Agency, Center for Public Health and Environmental Assessment, Research Triangle Park, NC, United States
| | - Xabier Arzuaga
- U.S. Environmental Protection Agency, Center for Public Health and Environmental Assessment, Washington, DC, United States
| | - Christine Cai
- U.S. Environmental Protection Agency, Center for Public Health and Environmental Assessment, Washington, DC, United States
| | - Andrew K Hotchkiss
- U.S. Environmental Protection Agency, Center for Public Health and Environmental Assessment, Research Triangle Park, NC, United States
| | - Susan L Makris
- U.S. Environmental Protection Agency, Center for Public Health and Environmental Assessment, Washington, DC, United States
| | - Erin E Yost
- U.S. Environmental Protection Agency, Center for Public Health and Environmental Assessment, Research Triangle Park, NC, United States.
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11
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Görmüş G, Ilgın S, Baysal M, Karaduman AB, Kılıç V, Aydoğan-Kılıç G, Karagöz O, Atlı-Eklioğlu Ö. Risperidone induced reproductive toxicity in male rats targeting leydig cells and hypothalamic-pituitary-gonadal axis by inducing oxidative stress. Andrologia 2020; 53:e13813. [PMID: 33108826 DOI: 10.1111/and.13813] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/03/2020] [Revised: 07/13/2020] [Accepted: 07/23/2020] [Indexed: 12/14/2022] Open
Abstract
Risperidone (RIS), a commonly used drug during a lifetime for the treatment of schizophrenia, causes some adverse effects in the male reproductive system; however, there is no comprehensive reproductive toxicity study of RIS. For this purpose, male rats were administered orally for 1.25, 2.5 and 3 mg/kg RIS for 28 days and the sperm count, motility, morphology, DNA damage and the histological changes in testicular tissue were evaluated. Follicle-stimulating hormone (FSH), luteinising hormone (LH) and serum levels of testosterone, which are the main hormonal regulators of reproduction, and testicular glutathione (GSH), catalase (CAT), superoxide dismutase (SOD) and malondialdehyde (MDA) levels as the indicators of oxidative stress were determined. Normal sperm morphology was decreased in RIS groups and histopathological degeneration occurred in testis tissue dose-dependently. Serum LH levels were not altered; however, FSH and testosterone levels decreased in the high-dose group. Histopathologic examination showed RIS toxicity targeted Leydig cells, which might be associated with impairment of the hypothalamic-pituitary-gonadal (HPG) axis. GSH levels were decreased and MDA levels were increased in the high-dose group which was evaluated as indicators of oxidative stress. In conclusion, RIS caused reproductive toxicity in male rats by inducing oxidative stress and disrupting hormonal regulation.
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Affiliation(s)
- Gözde Görmüş
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Anadolu University, Eskişehir, Turkey
| | - Sinem Ilgın
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Anadolu University, Eskişehir, Turkey
| | - Merve Baysal
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Anadolu University, Eskişehir, Turkey
| | - Abdullah Burak Karaduman
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Anadolu University, Eskişehir, Turkey
| | - Volkan Kılıç
- Department of Biology, Faculty of Science, Eskişehir Technical University, Eskişehir, Turkey
| | - Gözde Aydoğan-Kılıç
- Department of Biology, Faculty of Science, Eskişehir Technical University, Eskişehir, Turkey
| | - Onur Karagöz
- Department of Biology, Faculty of Science, Eskişehir Technical University, Eskişehir, Turkey
| | - Özlem Atlı-Eklioğlu
- Department of Pharmaceutical Toxicology, Faculty of Pharmacy, Anadolu University, Eskişehir, Turkey
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12
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Dishaw L, Yost E, Arzuaga X, Luke A, Kraft A, Walker T, Thayer K. A novel study evaluation strategy in the systematic review of animal toxicology studies for human health assessments of environmental chemicals. ENVIRONMENT INTERNATIONAL 2020; 141:105736. [PMID: 32434117 PMCID: PMC8422842 DOI: 10.1016/j.envint.2020.105736] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/23/2019] [Revised: 04/09/2020] [Accepted: 04/10/2020] [Indexed: 05/06/2023]
Abstract
A key aspect of the systematic review process is study evaluation to understand the strengths and weaknesses of individual studies included in the review. The present manuscript describes the process currently being used by the Environmental Protection Agency's (EPA) Integrated Risk Information System (IRIS) Program to evaluate animal toxicity studies, illustrated by application to the recent systematic reviews of two phthalates: diisobutyl phthalate (DIBP) and diethyl phthalate (DEP). The IRIS Program uses a domain-based approach that was developed after careful consideration of tools used by others to evaluate experimental animal studies in toxicology and pre-clinical research. Standard practice is to have studies evaluated by at least two independent reviewers for aspects related to reporting quality, risk of bias/internal validity (e.g., randomization, blinding at outcome assessment, methods used to expose animals and assess outcomes, etc.), and sensitivity to identify factors that may limit the ability of a study to detect a true effect. To promote consistency across raters, prompting considerations and example responses are provided to reviewers, and a pilot phase is conducted. The evaluation process is performed separately for each outcome reported in a study, as the utility of a study may vary for different outcomes. Input from subject matter experts is used to identify chemical- and outcome-specific considerations (e.g., lifestage of exposure and outcome assessment when considering reproductive effects) to guide judgments within particular evaluation domains. For each evaluation domain, reviewers reach a consensus on a rating of Good, Adequate, Deficient, or Critically Deficient. These individual domain ratings are then used to determine the overall confidence in the study (High Confidence, Medium Confidence, Low Confidence, or Deficient). Study evaluation results, including the justifications for reviewer judgements, are documented and made publicly available in EPA's version of Health Assessment Workspace Collaborative (HAWC), a free and open source web-based software application. (The views expressed are those of the authors and do not necessarily represent the views or policies of the US EPA).
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Affiliation(s)
- Laura Dishaw
- US EPA, Center for Public Health and Environmental Assessment, Research Triangle Park, NC, United States.
| | - Erin Yost
- US EPA, Center for Public Health and Environmental Assessment, Research Triangle Park, NC, United States
| | - Xabier Arzuaga
- US EPA, Center for Public Health and Environmental Assessment, Washington, DC, United States
| | - April Luke
- US EPA, Office of Emergency Management, Washington, DC, United States
| | - Andrew Kraft
- US EPA, Center for Public Health and Environmental Assessment, Washington, DC, United States
| | - Teneille Walker
- US EPA, Center for Public Health and Environmental Assessment, Washington, DC, United States
| | - Kris Thayer
- US EPA, Center for Public Health and Environmental Assessment, Research Triangle Park, NC, United States
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13
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Halo M, Massanyi P, Gren A, Lasak A, Slanina T, Ondruska L, Muchacka R, Galbavy D, Ivanic P, Schneir ER, Formicki G. Time and Dose-Dependent Effects of Viscum Album Quercus on Rabbit Spermatozoa Motility and Viability in Vitro. Physiol Res 2019; 68:955-972. [PMID: 31647301 DOI: 10.33549/physiolres.934223] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
The target of this study was to evaluate the effect of extract of the European mistletoe - Viscum album quercus L. on spermatozoa motility and viability in vitro. The CASA system was used to determine the spermatozoa motility parameters at different time intervals (0, 1, 2 and 3 h) and spermatozoa viability was determined in five different doses of Viscum album quercus L [10 (QA), 6.6 (QB), 3.3 (QC), 2.5 (QD) and 2 (QE) mg/ml]. Results in experimental groups detected a significant deterioration on rabbit spermatozoa after 1, 2 and 3 hours, compared to the control. The initial total spermatozoa motility showed increased value for all doses of Viscum album quercus in comparison to control. After in vitro culture a dose-dependent decrease (QA: reduction of 69.7 %, QB: reduction of 40.9 %) was found. For the progressive spermatozoa most significant decrease (86.8 % for QA vs. 48.5 % for QB) was detected compared to the control after 3 hours of culture. Spermatozoa viability (MTT test) was decreased in all experiment groups at the end of experiment, but the differences were not significant. Significant alterations of membrane integrity were found in groups with the highest Viscum album quercus concentration (QA, QB), but acrosome integrity showed no significant changes. Results suggest negative dose- and time-dependent effect of Viscum album quercus at higher doses on spermatozoa motility and viability parameters in vitro.
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Affiliation(s)
- M Halo
- Department of Animal Physiology, Faculty of Biotechnology and Food Sciences, Slovak University of Agriculture, Nitra, Slovak Republic.
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Arzuaga X, Walker T, Yost EE, Radke EG, Hotchkiss AK. Use of the Adverse Outcome Pathway (AOP) framework to evaluate species concordance and human relevance of Dibutyl phthalate (DBP)-induced male reproductive toxicity. Reprod Toxicol 2019; 96:445-458. [PMID: 31260805 PMCID: PMC10067323 DOI: 10.1016/j.reprotox.2019.06.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2019] [Revised: 06/05/2019] [Accepted: 06/25/2019] [Indexed: 12/14/2022]
Abstract
Dibutyl phthalate (DBP) is a phthalate ester used as a plasticizer, and solvent. Studies using rats consistently report that DBP exposure disrupts normal development of the male reproductive system in part via inhibition of androgen synthesis. However, studies using xenograft models report that in human fetal testis DBP exposure is unlikely to impair testosterone synthesis. These results question the validity of the rat model for assessment of male reproductive effects caused by DBP. The Adverse Outcome Pathway (AOP) framework was used to evaluate the available evidence for DBP-induced toxicity to the male reproductive system. Three relevant biological elements were identified: 1) fetal rats are more sensitive than other rodents and human fetal xenografts to DBP-induced anti-androgenic effects, 2) DBP-induced androgen-independent adverse outcomes are conserved amongst different mammalian models and human fetal testis xenografts, and 3) DBP-induced anti-androgenic effects are conserved in different mammalian species when exposure occurs during postnatal life stages.
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Affiliation(s)
- Xabier Arzuaga
- U.S. Environmental Protection Agency, National Center for Environmental Assessment, Washington, DC, United States of America.
| | - Teneille Walker
- U.S. Environmental Protection Agency, National Center for Environmental Assessment, Washington, DC, United States of America
| | - Erin E Yost
- U.S. Environmental Protection Agency, National Center for Environmental Assessment, Research Triangle Park, NC, United States of America
| | - Elizabeth G Radke
- U.S. Environmental Protection Agency, National Center for Environmental Assessment, Washington, DC, United States of America
| | - Andrew K Hotchkiss
- U.S. Environmental Protection Agency, National Center for Environmental Assessment, Research Triangle Park, NC, United States of America
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Serag El Din OS, Abd El Azim BH, Lotfy RA. Fish diet and male reproductive hormones in albino rats. THE JOURNAL OF BASIC AND APPLIED ZOOLOGY 2018; 79:37. [DOI: 10.1186/s41936-018-0051-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/04/2018] [Accepted: 10/04/2018] [Indexed: 09/02/2023]
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16
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Evaluation of a 9-valent HPV vaccine in Sprague-Dawley rats: Nonclinical studies assessing general, reproductive, and developmental toxicity. Vaccine 2018; 36:6401-6407. [DOI: 10.1016/j.vaccine.2018.08.071] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2018] [Revised: 08/08/2018] [Accepted: 08/29/2018] [Indexed: 11/19/2022]
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17
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Knutsen HK, Alexander J, Barregård L, Bignami M, Brüschweiler B, Ceccatelli S, Cottrill B, Dinovi M, Edler L, Grasl-Kraupp B, Hoogenboom LR, Nebbia CS, Oswald IP, Petersen A, Rose M, Roudot AC, Schwerdtle T, Vleminckx C, Vollmer G, Wallace H, Lampen A, Morris I, Piersma A, Schrenk D, Binaglia M, Levorato S, Hogstrand C. Update of the risk assessment on 3-monochloropropane diol and its fatty acid esters. EFSA J 2018; 16:e05083. [PMID: 32625654 PMCID: PMC7009698 DOI: 10.2903/j.efsa.2018.5083] [Citation(s) in RCA: 43] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022] Open
Abstract
The CONTAM Panel updated the assessment of the risks for human health related to the presence of 3-monochloropropane diol (3-MCPD) and its fatty acid esters in food published in 2016 in view of the scientific divergence identified in the establishment of the tolerable daily intake (TDI) in the Joint FAO/WHO Expert Committee on Food Additives and Contaminants (FAO/WHO) report published in 2017. In this update, dose-response analysis was performed following the recent EFSA Scientific Committee guidance on the use of benchmark dose (BMD) approach in risk assessment, and a review of available data on developmental and reproduction toxicity was included. The outcome of this review indicates that in rats short-term exposure to 3-MCPD above 1 mg/kg body weight (bw) per day can induce reduced sperm motility associated with reduced male fecundity. Decreased sperm count and histopathological changes in the testis and epididymis were observed following longer treatment periods at higher doses. Regarding increased incidence kidney tubular hyperplasia, BMD analysis using model averaging resulted in a BMDL 10 of 0.20 mg/kg bw per day in male rats, which was selected as the new Reference Point (RP) for renal effects. For the effects on male fertility, decreased sperm motility was selected as the most sensitive relevant endpoint and a BMDL 05 of 0.44 mg/kg bw per day was calculated. The RP for renal effects was considered to derive an updated group TDI of 2 μg/kg bw per day for 3-MCPD and its fatty acid esters and was considered protective also for effects on male fertility. The established TDI of 2 μg/kg bw per day is not exceeded in the adult population. A slight exceedance of the TDI was observed in the high consumers of the younger age groups and in particular for the scenarios on infants receiving formula only.
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18
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Florea A, Puică C, Hamed S, Tilinca M, Matei H. Histopathological and ultrastructural changes experimentally induced by bee venom in seminiferous epithelium via structural-functional alteration of Sertoli cells. Micron 2017; 102:1-14. [PMID: 28830057 DOI: 10.1016/j.micron.2017.07.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2017] [Revised: 07/29/2017] [Accepted: 07/29/2017] [Indexed: 12/13/2022]
Abstract
We tested here the ability of bee venom (BV) to interfere with spermatogenesis in rats in two experimental conditions. The histopathological changes were assessed with brightfield microscopy using a novel staining technique, based on methylene blue, orange G and ponceau xylidine. Transmission electron microscopy was also used to identify fine subcellular changes. BV injection for 30days in daily doses of 700μg BV/kg resulted in reducing testicular weight, along with significant larger diameters of seminiferous tubules and reduced number of Sertoli cells (SCs). SCs were vacuolated, detached from the basement membrane, many necrosed, leading to the basement membrane denudation. Germ cells layers were separated by empty spaces conferring a rarefied aspect to the tissue, and spermatids were detached into lumen. Thus, the seminiferous epithelium was significantly thinned. Many Leydig cells (LCs) were in a necrotic state, with disrupted plasma membrane and without smooth endoplasmic reticulum. The acute treatment with a single LD50 of 62mgBV/kg, was followed by focal disruptions of the basement membrane and localized areas of necrosis, mainly affecting the SCs. Most of the observed SCs as well as some spermatogonia were highly vacuoled, empty spaces being observed within the epithelium. The SCs count was significantly decreased. Spermatids had also the tendency of separation from the SCs, and the significant larger diameter of the tubules found was associated with a thicker epithelium. Many LCs were necrosed, with disrupted plasma membrane, swollen mitochondria, no endoplasmic reticulum and implicitly showing rarefied cytoplasm. We concluded that BV was a testicular toxicant affecting both the LCs and the seminiferous tubules. The SCs cells represented the primary target site of BV whose effects were next extended upon the germ cells. In all cells, BV triggered unspecific degenerative changes that could impaire spermatogenesis. The present study also proposes an alternative staining technique very useful in assessing the histopathological aspects of spermatogenesis.
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Affiliation(s)
- Adrian Florea
- Department of Cell and Molecular Biology, Faculty of Medicine, "Iuliu Haţieganu" University of Medicine and Pharmacy, 6 Louis Pasteur St., 400349 Cluj-Napoca, Romania.
| | - Constantin Puică
- Department of Physiology, Institute of Biological Research, 48 Gheorgh Bilaşcu St., 400015 Cluj-Napoca, Romania
| | - Sami Hamed
- Department of Cell and Molecular Biology, Faculty of Medicine, "Iuliu Haţieganu" University of Medicine and Pharmacy, 6 Louis Pasteur St., 400349 Cluj-Napoca, Romania
| | - Mariana Tilinca
- Department of Cellular and Molecular Biology, Faculty of Medicine, University of Medicine and Pharmacy, 38 Gheorghe Marinescu St., 540139 Târgu-Mureş, Romania
| | - Horea Matei
- Department of Cell and Molecular Biology, Faculty of Medicine, "Iuliu Haţieganu" University of Medicine and Pharmacy, 6 Louis Pasteur St., 400349 Cluj-Napoca, Romania
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Borges CDS, Pacheco TL, da Silva KP, Fernandes FH, Gregory M, Pupo AS, Salvadori DMF, Cyr DG, Kempinas WDG. Betamethasone causes intergenerational reproductive impairment in male rats. Reprod Toxicol 2017; 71:108-117. [DOI: 10.1016/j.reprotox.2017.04.012] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2016] [Revised: 03/27/2017] [Accepted: 04/26/2017] [Indexed: 12/30/2022]
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20
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Stewart J. The relevance of experimental reproductive studies in safety assessment. CURRENT OPINION IN TOXICOLOGY 2017. [DOI: 10.1016/j.cotox.2017.05.002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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Dekant W, Bridges J. Assessment of reproductive and developmental effects of DINP, DnHP and DCHP using quantitative weight of evidence. Regul Toxicol Pharmacol 2016; 81:397-406. [DOI: 10.1016/j.yrtph.2016.09.032] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Revised: 09/22/2016] [Accepted: 09/27/2016] [Indexed: 10/20/2022]
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Lent EM, Crouse LCB, Jackovitz AM, Carroll EE, Johnson MS. An extended one-generation reproductive toxicity test of 1,2,4-Triazol-5-one (NTO) in rats. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2016; 79:1159-1178. [PMID: 27754820 DOI: 10.1080/15287394.2016.1219893] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Nitrotriazolone (1,2,4-triazol-5-one; NTO), an insensitive, energetic material used in explosive formulations, induced testicular toxicity and oligospermia in repeated-dose oral toxicity tests in rats. To evaluate whether NTO produces additional reproductive and developmental effects, a modified extended one-generation reproductive toxicity test was conducted. Rats were provided ad libitum access to NTO in drinking water at 0-, 144-, 720-, or 3600-mg/L NTO. Treatment of the parental generation began 2 (females) and 4 (males) wk premating and continued until weaning of litters. Direct dosing of offspring (F1) occurred from weaning through puberty. Pups were counted and weighed on postnatal day (PND) 0/1. Anogenital distance (AGD) was measured on PND 4 and males were examined for presence of nipples on PND 13. F1 offspring were examined daily for attainment of puberty. NTO did not markedly affect measures of fertility, including mating indices, gestation index, litter size, and sex ratio. Seminiferous tubule degeneration or atrophy was observed in P1 and F1 3600-mg/L NTO males. F1 males in the 3600 mg/L group exhibited reduced reproductive organ mass (testes, epididymides, and accessory sex organs). Nipple retention was increased in NTO exposed F1 males compared to controls. Attainment of puberty was delayed by 2.6 d in the 3600-mg/L NTO-exposed males relative to controls. Comparison of the effects of NTO with those of antiandrogens suggests absence of malformations of the genital tract in NTO-exposed males. This study supports previous findings indicating that NTO is a testicular toxicant with male developmental effects that may be secondary to testicular toxicity.
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Affiliation(s)
- Emily May Lent
- a Toxicology Directorate , U.S. Army Public Health Center , Aberdeen Proving Ground , Maryland , USA
| | - Lee C B Crouse
- a Toxicology Directorate , U.S. Army Public Health Center , Aberdeen Proving Ground , Maryland , USA
| | - Allison M Jackovitz
- a Toxicology Directorate , U.S. Army Public Health Center , Aberdeen Proving Ground , Maryland , USA
| | - Erica E Carroll
- a Toxicology Directorate , U.S. Army Public Health Center , Aberdeen Proving Ground , Maryland , USA
| | - Mark S Johnson
- a Toxicology Directorate , U.S. Army Public Health Center , Aberdeen Proving Ground , Maryland , USA
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Batke M, Gütlein M, Partosch F, Gundert-Remy U, Helma C, Kramer S, Maunz A, Seeland M, Bitsch A. Innovative Strategies to Develop Chemical Categories Using a Combination of Structural and Toxicological Properties. Front Pharmacol 2016; 7:321. [PMID: 27708580 PMCID: PMC5030828 DOI: 10.3389/fphar.2016.00321] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/27/2016] [Accepted: 09/05/2016] [Indexed: 11/16/2022] Open
Abstract
Interest is increasing in the development of non-animal methods for toxicological evaluations. These methods are however, particularly challenging for complex toxicological endpoints such as repeated dose toxicity. European Legislation, e.g., the European Union's Cosmetic Directive and REACH, demands the use of alternative methods. Frameworks, such as the Read-across Assessment Framework or the Adverse Outcome Pathway Knowledge Base, support the development of these methods. The aim of the project presented in this publication was to develop substance categories for a read-across with complex endpoints of toxicity based on existing databases. The basic conceptual approach was to combine structural similarity with shared mechanisms of action. Substances with similar chemical structure and toxicological profile form candidate categories suitable for read-across. We combined two databases on repeated dose toxicity, RepDose database, and ELINCS database to form a common database for the identification of categories. The resulting database contained physicochemical, structural, and toxicological data, which were refined and curated for cluster analyses. We applied the Predictive Clustering Tree (PCT) approach for clustering chemicals based on structural and on toxicological information to detect groups of chemicals with similar toxic profiles and pathways/mechanisms of toxicity. As many of the experimental toxicity values were not available, this data was imputed by predicting them with a multi-label classification method, prior to clustering. The clustering results were evaluated by assessing chemical and toxicological similarities with the aim of identifying clusters with a concordance between structural information and toxicity profiles/mechanisms. From these chosen clusters, seven were selected for a quantitative read-across, based on a small ratio of NOAEL of the members with the highest and the lowest NOAEL in the cluster (< 5). We discuss the limitations of the approach. Based on this analysis we propose improvements for a follow-up approach, such as incorporation of metabolic information and more detailed mechanistic information. The software enables the user to allocate a substance in a cluster and to use this information for a possible read- across. The clustering tool is provided as a free web service, accessible at http://mlc-reach.informatik.uni-mainz.de.
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Affiliation(s)
- Monika Batke
- Department Chemikalienbeureilung, Dantenbanken und Expertensysteme, Fraunhofer Institut für Toxikologie und Experimentelle Medizin Hannover, Germany
| | - Martin Gütlein
- Institut für Informatik, Johannes Gutenberg-Universität Mainz Mainz, Germany
| | - Falko Partosch
- Institut für Arbeits-, Sozial- und Umweltmedizin, Universitätsmedizin Göttingen Göttingen, Germany
| | - Ursula Gundert-Remy
- Institut für Klinische Pharmakologie und Toxikologie, Charité Universitätsmedizin Berlin Berlin, Germany
| | | | - Stefan Kramer
- Institut für Informatik, Johannes Gutenberg-Universität Mainz Mainz, Germany
| | | | - Madeleine Seeland
- Institut für Informatik, Technische Universität München München, Germany
| | - Annette Bitsch
- Department Chemikalienbeureilung, Dantenbanken und Expertensysteme, Fraunhofer Institut für Toxikologie und Experimentelle Medizin Hannover, Germany
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24
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Timing is everything for sperm assessment in fertility studies. Reprod Toxicol 2016; 64:141-50. [DOI: 10.1016/j.reprotox.2016.05.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2016] [Revised: 04/25/2016] [Accepted: 05/02/2016] [Indexed: 11/19/2022]
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25
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Abarikwu SO, Olufemi PD, Lawrence CJ, Wekere FC, Ochulor AC, Barikuma AM. Rutin, an antioxidant flavonoid, induces glutathione and glutathione peroxidase activities to protect against ethanol effects in cadmium-induced oxidative stress in the testis of adult rats. Andrologia 2016; 49. [PMID: 27562125 DOI: 10.1111/and.12696] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 07/01/2016] [Indexed: 12/21/2022] Open
Abstract
Exposure to cadmium (Cd) reduces sperm quality and induces oxidative stress in the testis. Rutin is an effective antioxidant flavonoid. We studied the effect of ethanol (EtOH, 5 g/kg b.wt.) intake on Cd (50 mg/kg b.wt.)-induced testicular toxicity with or without RUT pre-treatment (25, 50, 100 mg/kg b.wt.) in rats. At the end of the 15-day oral treatment, co-treatment with EtOH decreased the activities of glutathione (GSH), GSH-peroxidase and superoxide dismutase resulting to slight increase in the testicular MDA level compared to Cd-treated rats. The Cd+EtOH animals had higher levels of abnormal spermatozoa, decreased epididymal sperm number and serum testosterone levels (p < .05) compared to the Cd-treated animals. Rutin co-administration protected against the EtOH effects in a dose-dependent manner, with the Cd+EtOH+50 mg/kg RUT- and Cd+EtOH+100 mg/kg RUT-treated animals having higher GSH and GSH-Px activities beyond the control values (p < .05). In a supplementary study, animals treated daily with RUT alone (25, 50, 100 mg/kg b.wt.) for 15 days dose-dependently increased testicular GSH-peroxidase and GSH activities by 9.38%, 31.25%, 56.25% and 7.14%, 32.14%, 60.71%, respectively, compared to control values. Therefore, RUT induces GSH and GSH-Px activities to protect against Cd+EtOH-induced testis oxidative stress in rats.
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Affiliation(s)
- S O Abarikwu
- Department of Biochemistry, University of Port Harcourt, Choba, Nigeria
| | - P D Olufemi
- Department of Biochemistry, University of Port Harcourt, Choba, Nigeria
| | - C J Lawrence
- Department of Biochemistry, University of Port Harcourt, Choba, Nigeria
| | - F C Wekere
- Department of Biochemistry, University of Port Harcourt, Choba, Nigeria
| | - A C Ochulor
- Department of Biochemistry, University of Port Harcourt, Choba, Nigeria
| | - A M Barikuma
- Department of Biochemistry, University of Port Harcourt, Choba, Nigeria
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26
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Li DM, Han XD. Evaluation of toxicity of methyl tert-butyl ether (MTBE) on mouse spermatogenic cells in vitro. Toxicol Ind Health 2016; 22:291-9. [PMID: 17022436 DOI: 10.1177/0748233706070310] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
As a synthetic organic chemical, methyl tert-butyl ether (MTBE) is the most common fuel oxygenate. The increasing use of MTBE has raised concern over its safety. Previous studies in vivo revealed that MTBE could alter the male reproduction system. Therefore, the current experiments were designed to evaluate whether isolated mice spermatogenic cells in vitro were sensitive to exposure to MTBE at environmental levels, and to evaluate whether spermatogenic cells had undergone changes in morphologic, activity and viability parameters after exposure to MTBE. Spermatogenic cells in vitro were incubated with medium alone (control), 100 ppb, 10 ppm, 1000 ppm, 3000 ppm MTBE, respectively, for 6, 12, 18 h. MTT (3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazo liumbromide) assay, staining with fluorescein diacetate (FDA) and propidium iodide (PI), and flow cytometric analyses were used to assess MTBE toxicity on cells and DNA. The results showed that there were no significant differences between control and treatments of ≤ 1000 ppm MTBE at the same time point. Although 3000 ppm MTBE could exert toxic effects directly on spermatogenic cells, environmental levels of MTBE did not exert toxic effects on cultured spermatogenic cells.
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Affiliation(s)
- D M Li
- Laboratory of Immune and Reproduction Biology, Medical College of Nanjing University, Jiangsu, China
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27
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Borges CS, Dias AFMG, Rosa JL, Silva PV, Silva RF, Barros AL, Sanabria M, Guerra MT, Gregory M, Cyr DG, De G Kempinas W. Alterations in male rats following in utero exposure to betamethasone suggests changes in reproductive programming. Reprod Toxicol 2016; 63:125-34. [PMID: 27247242 DOI: 10.1016/j.reprotox.2016.05.021] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 05/23/2016] [Accepted: 05/27/2016] [Indexed: 10/21/2022]
Abstract
Antenatal betamethasone is used for accelerating fetal lung maturation for women at risk of preterm birth. Altered sperm parameters were reported in adult rats after intrauterine exposure to betamethasone. In this study, male rat offspring were assessed for reproductive development after dam exposure to betamethasone (0.1mg/kg) or vehicle on Days 12, 13, 18 and 19 of pregnancy. The treatment resulted in reduction in the offspring body weight, delay in preputial separation, decreased seminal vesicle weight, testosterone levels and fertility, and increased testicular weight. In the testis, morphologically abnormal seminiferous tubules were observed, characterized by an irregular cell distribution with Sertoli cell that were displaced towards the tubular lumen. These cells expressed both Connexin 43 (Cx43) and Proliferative Nuclear Cell Antigen (PCNA). In conclusion, intrauterine betamethasone treatment appears to promote reproductive programming and impairment of rat sexual development and fertility due to, at least in part, unusual testicular disorders.
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Affiliation(s)
- Cibele S Borges
- Department of Morphology, Institute of Biosciences, Univ Estadual Paulista-UNESP, Distrito de Rubião Junior s/n°, 18618-970 Botucatu, SP, Brazil.
| | - Ana Flávia M G Dias
- Department of Morphology, Institute of Biosciences, Univ Estadual Paulista-UNESP, Distrito de Rubião Junior s/n°, 18618-970 Botucatu, SP, Brazil
| | - Josiane Lima Rosa
- Department of Morphology, Institute of Biosciences, Univ Estadual Paulista-UNESP, Distrito de Rubião Junior s/n°, 18618-970 Botucatu, SP, Brazil
| | - Patricia V Silva
- Department of Morphology, Institute of Biosciences, Univ Estadual Paulista-UNESP, Distrito de Rubião Junior s/n°, 18618-970 Botucatu, SP, Brazil
| | - Raquel F Silva
- Department of Morphology, Institute of Biosciences, Univ Estadual Paulista-UNESP, Distrito de Rubião Junior s/n°, 18618-970 Botucatu, SP, Brazil
| | - Aline L Barros
- Department of Morphology, Institute of Biosciences, Univ Estadual Paulista-UNESP, Distrito de Rubião Junior s/n°, 18618-970 Botucatu, SP, Brazil
| | - Marciana Sanabria
- Department of Morphology, Institute of Biosciences, Univ Estadual Paulista-UNESP, Distrito de Rubião Junior s/n°, 18618-970 Botucatu, SP, Brazil
| | - Marina T Guerra
- Department of Morphology, Institute of Biosciences, Univ Estadual Paulista-UNESP, Distrito de Rubião Junior s/n°, 18618-970 Botucatu, SP, Brazil
| | - Mary Gregory
- Laboratory for Reproductive Toxicology, INRS-Institut Armand-Frappier, University of Quebec, 531 boulevard des Prairies, Laval, Québec, Canada, H7V 1B7
| | - Daniel G Cyr
- Laboratory for Reproductive Toxicology, INRS-Institut Armand-Frappier, University of Quebec, 531 boulevard des Prairies, Laval, Québec, Canada, H7V 1B7
| | - Wilma De G Kempinas
- Department of Morphology, Institute of Biosciences, Univ Estadual Paulista-UNESP, Distrito de Rubião Junior s/n°, 18618-970 Botucatu, SP, Brazil
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28
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Aksu EH, Akman O, Ömür AD, Karakuş E, Can İ, Kandemir FM, Dorman E, Uçar Ö. 3,3 diindolylmethane leads to apoptosis, decreases sperm quality, affects blood estradiol 17 β and testosterone, oestrogen (α and β) and androgen receptor levels in the reproductive system in male rats. Andrologia 2016; 48:1155-1165. [DOI: 10.1111/and.12554] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 12/29/2015] [Indexed: 12/27/2022] Open
Affiliation(s)
- E. H. Aksu
- Faculty of Veterinary Medicine; Department of Reproduction and Artificial Insemination; Atatürk University; Erzurum Turkey
| | - O. Akman
- Faculty of Veterinary Medicine; Department of Reproduction and Artificial Insemination; Atatürk University; Erzurum Turkey
| | - A. D. Ömür
- Faculty of Veterinary Medicine; Department of Reproduction and Artificial Insemination; Atatürk University; Erzurum Turkey
| | - E. Karakuş
- Faculty of Veterinary Medicine; Department of Pharmacology; Atatürk University; Erzurum Turkey
| | - İ. Can
- Faculty of Medicine; Department of Histology; Kafkas University; Kars Turkey
| | - F. M. Kandemir
- Faculty of Veterinary Medicine; Department of Biochemistry; Atatürk University; Erzurum Turkey
| | - E. Dorman
- Faculty of Medicine; Biochemistry Laboratories; Atatürk University; Erzurum Turkey
| | - Ö. Uçar
- Faculty of Veterinary Medicine; Department of Reproduction and Artificial Insemination; Atatürk University; Erzurum Turkey
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29
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Renato MM, Marcos ONFBA, Leonardo TO, Rita ASDSA, Vera MP, Martha DOG. Abnormality of spermatozoa in Wistar rats exposed to high doses of Valeriana officinalis L. aqueous suspension. ACTA ACUST UNITED AC 2016. [DOI: 10.5897/jmpr2015.5904] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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30
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Stoffmonographie für 3-(4-Methylbenzyliden)-kampfer (4-MBC) – HBM-Werte für die Summe der Metaboliten 3-(4-Carboxybenzyliden)-kampfer (3-4CBC) und 3-(4-Carboxybenzyliden)-6-Hydroxykampfer (3-4CBHC) im Urin von Erwachsenen und Kindern. Bundesgesundheitsblatt Gesundheitsforschung Gesundheitsschutz 2015; 59:132-49. [DOI: 10.1007/s00103-015-2272-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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31
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The Coadministration of N-Acetylcysteine Ameliorates the Effects of Arsenic Trioxide on the Male Mouse Genital System. OXIDATIVE MEDICINE AND CELLULAR LONGEVITY 2015; 2016:4257498. [PMID: 26839632 PMCID: PMC4709715 DOI: 10.1155/2016/4257498] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Accepted: 09/30/2015] [Indexed: 12/11/2022]
Abstract
Arsenic trioxide (As2O3) has shown effectiveness in treatment of leukemia but is also associated with reproductive toxicity. Since remediation with N-acetylcysteine (NAC) may mitigate the adverse effects caused by exposure, we assessed the effects of As2O3 and its potential reversibility after exposure cessation or coadministration of NAC. Animals received 0.3 or 3.0 mg/Kg/day of As2O3 subcutaneously and 40 mM of NAC in tap water. As2O3 treatment impaired spermatogenesis and sperm motility and decreased seminal vesicle weight and testosterone serum levels; after suspension of treatment, these parameters remained altered. When NAC was administered, animals showed improvement in sperm parameters and seminal vesicle weight. In vitro epididymal contractility was increased in As2O3-treated animals. We concluded that As2O3 is toxic to the male mouse genital system by compromising sperm quality and quantity; these effects persisted even after suspension of the treatment. However, the coadministration of NAC ameliorates the harmful effects of the drug on the male genital system.
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32
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Pandey G, Jain GC. Assessment of Molybdenum Induced Alteration in Oxidative Indices, Biochemical Parameters and Sperm Quality in Testis of Wistar Male Rats. ACTA ACUST UNITED AC 2015. [DOI: 10.3923/ajb.2015.267.280] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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33
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Luvizutto JF, de Lm Solano M, Martinez MF, Fernandez CD, de A Umbuzeiro G, de Camargo JL. Potential androgenic effects of urban sewage sludge in male rats. ACTA ACUST UNITED AC 2015. [DOI: 10.1080/23273747.2015.1066656] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
- João Fl Luvizutto
- Botucatu Medical School; São Paulo State University; Botucatu, Brazil
- These authors equally contributed to this work
| | - Marize de Lm Solano
- Botucatu Medical School; São Paulo State University; Botucatu, Brazil
- School of Technology; University of Campinas; Limeira, Brazil
- These authors equally contributed to this work
| | - Meire F Martinez
- Botucatu Medical School; São Paulo State University; Botucatu, Brazil
- Institute of Biosciences; São Paulo State University; Botucatu, Brazi
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34
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Yoisungnern T, Choi YJ, Han JW, Kang MH, Das J, Gurunathan S, Kwon DN, Cho SG, Park C, Chang WK, Chang BS, Parnpai R, Kim JH. Internalization of silver nanoparticles into mouse spermatozoa results in poor fertilization and compromised embryo development. Sci Rep 2015; 5:11170. [PMID: 26054035 PMCID: PMC4459204 DOI: 10.1038/srep11170] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2015] [Accepted: 05/18/2015] [Indexed: 11/09/2022] Open
Abstract
Silver nanoparticles (AgNPs) have many features that make them attractive as medical devices, especially in therapeutic agents and drug delivery systems. Here we have introduced AgNPs into mouse spermatozoa and then determined the cytotoxic effects of AgNPs on sperm function and subsequent embryo development. Scanning electron microscopy and transmission electron microscopy analyses showed that AgNPs could be internalized into sperm cells. Furthermore, exposure to AgNPs inhibited sperm viability and the acrosome reaction in a dose-dependent manner, whereas sperm mitochondrial copy numbers, morphological abnormalities, and mortality due to reactive oxygen species were significantly increased. Likewise, sperm abnormalities due to AgNPs internalization significantly decreased the rate of oocyte fertilization and blastocyst formation. Blastocysts obtained from AgNPs-treated spermatozoa showed lower expression of trophectoderm-associated and pluripotent marker genes. Overall, we propose that AgNPs internalization into spermatozoa may alter sperm physiology, leading to poor fertilization and embryonic development. Such AgNPs-induced reprotoxicity may be a valuable tool as models for testing the safety and applicability of medical devices using AgNPs.
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Affiliation(s)
- Ton Yoisungnern
- 1] Department of Animal Biotechnology, College of Animal Bioscience and Biotechnology/Animal Resources Research Center, Konkuk University, Seoul 143-701, South Korea [2] Embryo Technology and Stem Cell Research Center, School of Biotechnology, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
| | - Yun-Jung Choi
- Department of Animal Biotechnology, College of Animal Bioscience and Biotechnology/Animal Resources Research Center, Konkuk University, Seoul 143-701, South Korea
| | - Jae Woong Han
- Department of Animal Biotechnology, College of Animal Bioscience and Biotechnology/Animal Resources Research Center, Konkuk University, Seoul 143-701, South Korea
| | - Min-Hee Kang
- Department of Animal Biotechnology, College of Animal Bioscience and Biotechnology/Animal Resources Research Center, Konkuk University, Seoul 143-701, South Korea
| | - Joydeep Das
- Department of Animal Biotechnology, College of Animal Bioscience and Biotechnology/Animal Resources Research Center, Konkuk University, Seoul 143-701, South Korea
| | - Sangiliyandi Gurunathan
- Department of Animal Biotechnology, College of Animal Bioscience and Biotechnology/Animal Resources Research Center, Konkuk University, Seoul 143-701, South Korea
| | - Deug-Nam Kwon
- Department of Animal Biotechnology, College of Animal Bioscience and Biotechnology/Animal Resources Research Center, Konkuk University, Seoul 143-701, South Korea
| | - Ssang-Goo Cho
- Department of Animal Biotechnology, College of Animal Bioscience and Biotechnology/Animal Resources Research Center, Konkuk University, Seoul 143-701, South Korea
| | - Chankyu Park
- Department of Animal Biotechnology, College of Animal Bioscience and Biotechnology/Animal Resources Research Center, Konkuk University, Seoul 143-701, South Korea
| | - Won Kyung Chang
- Department of Animal Biotechnology, College of Animal Bioscience and Biotechnology/Animal Resources Research Center, Konkuk University, Seoul 143-701, South Korea
| | - Byung-Soo Chang
- Department of Cosmetology, Hanseo University, Seosan, Chungnam 356-706, Korea
| | - Rangsun Parnpai
- Embryo Technology and Stem Cell Research Center, School of Biotechnology, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand
| | - Jin-Hoi Kim
- Department of Animal Biotechnology, College of Animal Bioscience and Biotechnology/Animal Resources Research Center, Konkuk University, Seoul 143-701, South Korea
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35
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Zafar A, Eqani SAMAS, Bostan N, Cincinelli A, Tahir F, Shah STA, Hussain A, Alamdar A, Huang Q, Peng S, Shen H. Toxic metals signature in the human seminal plasma of Pakistani population and their potential role in male infertility. ENVIRONMENTAL GEOCHEMISTRY AND HEALTH 2015; 37:515-527. [PMID: 25471479 DOI: 10.1007/s10653-014-9666-8] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/21/2014] [Accepted: 11/27/2014] [Indexed: 05/28/2023]
Abstract
Aims of this study were to provide firsthand data on the incidence of trace metals in human seminal plasma and find possible correlations between levels of toxic metals and semen quality of Pakistani population. Human semen samples were collected from male partners of couples undergoing infertility assessment at the National Institute of Health Islamabad (Pakistan). We investigated seventy-five seminal plasma samples, which were further categorized into three groups (normozoospermia, oligozoospermia and azoospermia) according to WHO guidelines. The concentration of 17 different toxic metals in human seminal plasma was determined simultaneously by using Inductively coupled plasma mass spectrometry (ICP-MS). Out of 17 trace metals, Cd and Ni showed significant difference (p < 0.05) among three monitored groups. Ni and Cd concentrations in the seminal plasma were negatively correlated with sperm concentration (r = -0.26, -0.29) and motility (r = -0.33, -0.37), respectively. This study suggested that exposure of Ni and Cd is mainly related with the consumption of contaminated dietary items, including ghee (cooking oil), flour and other agri-products. In some semen samples, the concentrations of Sn, V, Cu, Pb, Cr and Hg exhibited high levels suggesting a recent human exposure to surrounding sources. In Pakistani human semen samples, the levels of trace metals were lower and/or comparable to that found in populations of other countries. The results show the first evidence of the effect of toxic metals on semen quality and male infertility in Pakistan.
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Affiliation(s)
- Ambreen Zafar
- Public Health and Environment Division, Department of Biosciences, COMSAT Institute of Information and Technology, Islamabad, Pakistan
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36
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Reis MMS, Moreira AC, Sousa M, Mathur PP, Oliveira PF, Alves MG. Sertoli cell as a model in male reproductive toxicology: Advantages and disadvantages. J Appl Toxicol 2015; 35:870-83. [DOI: 10.1002/jat.3122] [Citation(s) in RCA: 54] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2014] [Revised: 12/21/2014] [Accepted: 12/26/2014] [Indexed: 01/11/2023]
Affiliation(s)
- Mariana M. S. Reis
- Department of Microscopy, Laboratory of Cell Biology, UMIB-FCT, Institute of Biomedical Sciences Abel Salazar (ICBAS); University of Porto; Porto Portugal
| | - Ana C. Moreira
- Department of Microscopy, Laboratory of Cell Biology, UMIB-FCT, Institute of Biomedical Sciences Abel Salazar (ICBAS); University of Porto; Porto Portugal
| | - Mário Sousa
- Department of Microscopy, Laboratory of Cell Biology, UMIB-FCT, Institute of Biomedical Sciences Abel Salazar (ICBAS); University of Porto; Porto Portugal
| | - Premendu P. Mathur
- Department of Biochemistry and Molecular Biology, School of Life Sciences; Pondicherry University, Pondicherry, India & KIIT University; Bhubaneswar India
| | - Pedro F. Oliveira
- CICS - UBI - Health Sciences Research Centre; University of Beira Interior; Covilhã Portugal
| | - Marco G. Alves
- CICS - UBI - Health Sciences Research Centre; University of Beira Interior; Covilhã Portugal
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37
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Elsamanoudy AZ, Shaalan D, Gaballah MA, El-Atta HMA, Helaly AMN. Possible effects of metallosis on spermatozoal apoptotic genes expression in individuals with intramedullary nailing prosthesis. Biol Trace Elem Res 2014; 158:334-41. [PMID: 24723216 DOI: 10.1007/s12011-014-9965-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 03/04/2014] [Accepted: 03/31/2014] [Indexed: 11/25/2022]
Abstract
Seminal quality could be affected by metallosis caused by intramedullary nailing (IMN). Our objectives were to estimate metal ion levels in the seminal plasma of subjects with IMN, to determine their effects on semen parameters and on spermatozoal apoptotic gene expression, and to determine whether these expressed genes could be used as candidate biomarkers of seminal deterioration in individuals with IMN or not. Semen samples were collected from 60 subjects with IMN and 30 age-matched healthy controls. Seminal plasma contents of cobalt (Co), chromium (Cr), and molybdenum (Mo) were assayed. Spermatozoal Bcl-2 and Bax gene expressions were determined. Studied semen parameters were significantly lower in subjects with IMN for ≥5 years in relation to controls while the concentrations of Co, Cr, and Mo in the seminal plasma samples were significantly higher. There were significantly lower spermatozoal Bcl-2 expression, higher Bax expression, and lower Bcl-2/Bax ratio in subjects with IMN for ≥5 years than in controls. In subjects with IMN for ≥5 years, receiver operating characteristic (ROC) curve analysis of studied gene expressions and Bcl-2/Bax ratio were done showing priority of the ratio with 86.7 % sensitivity, 100 % specificity, 100 % positive predictive value, and 93.8 % negative predictive value at cutoff values ≤0.777. Co, Cr, and Mo metals are found at high concentrations in the seminal plasma of individuals with IMN leading to increased spermatozoal apoptotic activity. Spermatozoal Bcl-2/Bax ratio could be used as a candidate biomarker of reproductive disorders in individuals with intramedullary nailing.
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Affiliation(s)
- Ayman Z Elsamanoudy
- Department of Medical Biochemistry and Molecular Biology, Faculty of Medicine, Mansoura University, El-Gomhoria St., Mansoura, Egypt,
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38
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Booc F, Thornton C, Lister A, MacLatchy D, Willett KL. Benzo[a]pyrene effects on reproductive endpoints in Fundulus heteroclitus. Toxicol Sci 2014; 140:73-82. [PMID: 24747980 DOI: 10.1093/toxsci/kfu064] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
Benzo[a]pyrene (BaP) is a polycyclic aromatic hydrocarbon (PAH) that has been implicated in modulating aromatase enzyme function with the potential to interrupt normal reproductive function. The aim of this study was to use a fish model, Fundulus heteroclitus, to assess whether BaP exposure adversely impacts reproduction. Adult fish were exposed to waterborne BaP nominal concentrations of (0, 1, or 10 μg/l) for 28 days. Males and females were combined for the second half of the exposure (days 14-28) in order to quantitate egg production and fertilization success. Egg fertilization and subsequent hatching success of F1 embryos was significantly decreased by the high dose of BaP. In males, both gonad weight and plasma testosterone concentrations were significantly reduced compared to controls by 10 μg/l BaP. Histopathological examination of testes including spermatogonia, spermatocyte and spermatid cyst areas, percentage of cysts per phase, and area of spermatozoa per seminiferous tubule were not significantly affected. Other biomarkers, including male liver weight, liver vitellogenin (vtg) mRNA expression and sperm concentrations, were also not affected. In females, estradiol concentrations were significantly reduced after BaP exposure, but egg production, gonad weight, liver weight, vtg expression and oocyte maturation were not altered. Steroid concentrations in Fundulus larvae from exposed parents at 1 and 3 weeks posthatch were not significantly changed. BaP exposure at these environmentally relevant concentrations caused negative alterations particularly in male fish to both biochemical and phenotypic biomarkers associated with reproduction and multigenerational embryo survival.
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Affiliation(s)
- Frank Booc
- Department of Pharmacology and Environmental Toxicology Research Program, School of Pharmacy, University of Mississippi, University, Mississippi 38677
| | - Cammi Thornton
- Department of Pharmacology and Environmental Toxicology Research Program, School of Pharmacy, University of Mississippi, University, Mississippi 38677
| | - Andrea Lister
- Department of Biology, Wilfrid Laurier University, 75 University Avenue West, Waterloo, Ontario N2L 3C5, Canada
| | - Deborah MacLatchy
- Department of Biology, Wilfrid Laurier University, 75 University Avenue West, Waterloo, Ontario N2L 3C5, Canada
| | - Kristine L Willett
- Department of Pharmacology and Environmental Toxicology Research Program, School of Pharmacy, University of Mississippi, University, Mississippi 38677
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39
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Sensitivity of different generations and developmental stages in studies on reproductive toxicity. Toxicol Lett 2014; 226:245-55. [DOI: 10.1016/j.toxlet.2014.01.045] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2013] [Revised: 01/27/2014] [Accepted: 01/29/2014] [Indexed: 11/19/2022]
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40
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Marty MS, Neal BH, Zablotny CL, Yano BL, Andrus AK, Woolhiser MR, Boverhof DR, Saghir SA, Perala AW, Passage JK, Lawson MA, Bus JS, Lamb JC, Hammond L. An F1-extended one-generation reproductive toxicity study in Crl:CD(SD) rats with 2,4-dichlorophenoxyacetic acid. Toxicol Sci 2013; 136:527-47. [PMID: 24072463 PMCID: PMC3858197 DOI: 10.1093/toxsci/kft213] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
2,4-Dichlorophenoxyacetic acid (2,4-D) was assessed for systemic toxicity, reproductive toxicity, developmental neurotoxicity (DNT), developmental immunotoxicity (DIT), and endocrine toxicity. CD rats (27/sex/dose) were exposed to 0, 100, 300, 600 (female), or 800 (male) ppm 2,4-D in diet. Nonlinear toxicokinetic behavior was shown at high doses; the renal clearance saturation threshold for 2,4-D was exceeded markedly in females and slightly exceeded in males. Exposure was 4 weeks premating, 7 weeks postmating for P1 males and through lactation for P1 females. F1 offspring were examined for survival and development, and at weaning, pups were divided in cohorts, by sex and dose, and by systemic toxicity (10), DNT (10), DIT (20), and reproductive toxicity (≥ 23). Remaining weanlings were evaluated for systemic toxicity and neuropathology (10–12). Body weight decreased during lactation in high-dose P1 females and in F1 pups. Kidney was the primary target organ, with slight degeneration of proximal convoluted tubules observed in high-dose P1 males and in high-dose F1 males and females. A slight intergenerational difference in kidney toxicity was attributed to increased intake of 2,4-D in F1 offspring. Decreased weanling testes weights and delayed preputial separation in F1 males were attributed to decreased body weights. Endocrine-related effects were limited to slight thyroid hormone changes and adaptive histopathology in high-dose GD 17 dams seen only at a nonlinear toxicokinetic dose. 2,4-D did not cause reproductive toxicity, DNT, or DIT. The “No Observed Adverse Effect Level” for systemic toxicity was 300 ppm in both males (16.6mg/kg/day) and females (20.6mg/kg/day), which is approximately 6700- to 93 000-fold higher than that reported for 2,4-D exposures in human biomonitoring studies.
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Affiliation(s)
- Mary Sue Marty
- * Toxicology and Environmental Research & Consulting, The Dow Chemical Company, Midland, Michigan
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Borges CS, Missassi G, Pacini ESA, Kiguti LRA, Sanabria M, Silva RF, Banzato TP, Perobelli JE, Pupo AS, Kempinas WG. Slimmer or fertile? Pharmacological mechanisms involved in reduced sperm quality and fertility in rats exposed to the anorexigen sibutramine. PLoS One 2013; 8:e66091. [PMID: 23776614 PMCID: PMC3680400 DOI: 10.1371/journal.pone.0066091] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2013] [Accepted: 05/01/2013] [Indexed: 11/29/2022] Open
Abstract
Sperm acquire motility and fertility capacity during epididymal transit, under the control of androgens and sympathetic innervations. It is already known that the acceleration of epididymal sperm transit time can lead to lower sperm quality. In a previous work we showed that rats exposed to the anorexigen sibutramine, a non-selective serotonin-norepinephrine reuptake inhibitor, presented faster sperm transit time, lower epididymal sperm reserves and potentiation of the tension of epididymal duct to norepinephrine exposed acutely in vitro to sibutramine. In the present work we aimed to further investigate pharmacological mechanisms involved in these alterations and the impact on rat sperm quality. For this, adult male Wistar rats were treated with sibutramine (10 mg/kg/day) or vehicle for 30 days. Sibutramine decreased final body, seminal vesicle, ventral prostate and epididymal weights, as well as sperm transit time in the epididymal cauda. On the contrary of the in vitro pharmacological assays, in which sibutramine was added directly to the bath containing strips of distal epididymal cauda, the ductal tension was not altered after in vivo sub-chronic exposure to sibutramine. However, there is pharmacological evidence that the endogenous epididymal norepinephrine reserves were reduced in these animals. It was also shown that the decrease in prostate weight can be related to increased tension developed of the gland, due to sibutramine sympathomimetic effects. In addition, our results showed reduced sperm quality after in utero artificial insemination, a more sensitive procedure to assess fertility in rodents. The epididymal norepinephrine depletion exerted by sibutramine, associated with decreases in sperm transit time, quantity and quality, leading to reduced fertility in this experimental model, reinforces the concerns about the possible impact on fertility of man taking sibutramine as well as other non-selective serotonin-norepinephrine reuptake inhibitors, especially considering the lower reproductive efficiency of humans compared to males of other species.
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Affiliation(s)
- Cibele S. Borges
- Department of Morphology, Institute of Biosciences, UNESP - Univ Estadual Paulista, Botucatu, São Paulo, Brazil
| | - Gabriela Missassi
- Department of Morphology, Institute of Biosciences, UNESP - Univ Estadual Paulista, Botucatu, São Paulo, Brazil
| | - Enio S. A. Pacini
- Department of Pharmacology, Institute of Biosciences, UNESP - Univ Estadual Paulista, Botucatu, São Paulo, Brazil
| | - Luiz Ricardo A. Kiguti
- Department of Pharmacology, Institute of Biosciences, UNESP - Univ Estadual Paulista, Botucatu, São Paulo, Brazil
| | - Marciana Sanabria
- Department of Morphology, Institute of Biosciences, UNESP - Univ Estadual Paulista, Botucatu, São Paulo, Brazil
| | - Raquel F. Silva
- Department of Morphology, Institute of Biosciences, UNESP - Univ Estadual Paulista, Botucatu, São Paulo, Brazil
| | - Thais P. Banzato
- Department of Morphology, Institute of Biosciences, UNESP - Univ Estadual Paulista, Botucatu, São Paulo, Brazil
| | - Juliana E. Perobelli
- Department of Morphology, Institute of Biosciences, UNESP - Univ Estadual Paulista, Botucatu, São Paulo, Brazil
| | - André S. Pupo
- Department of Pharmacology, Institute of Biosciences, UNESP - Univ Estadual Paulista, Botucatu, São Paulo, Brazil
| | - Wilma G. Kempinas
- Department of Morphology, Institute of Biosciences, UNESP - Univ Estadual Paulista, Botucatu, São Paulo, Brazil
- * E-mail:
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Schleh C, Leoni AL. How to optimize the benefits of computer assisted sperm analysis in experimental toxicology. J Occup Med Toxicol 2013; 8:6. [PMID: 23497634 PMCID: PMC3599994 DOI: 10.1186/1745-6673-8-6] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2012] [Accepted: 03/05/2013] [Indexed: 11/16/2022] Open
Abstract
Exposure at the working place to various substances, that may affect semen quality is possible and should be investigated in detail. One appropriate method for this is computer-assisted sperm analysis (CASA) which offers multiple benefits in comparison to manual evaluation. However, several pitfalls exist, which make the evaluation of data obtained from CASA difficult to interpret. In the present commentary, we focus on these problems, show some examples, and try to define minimum standards which should be taken into consideration whenever working with computer-assisted sperm analysis.
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Affiliation(s)
- Carsten Schleh
- Department of in vivo Pharmacology / Toxicology, BSL BIOSERVICE Scientific Laboratories GmbH, Behringstr, 6 / 8, Planegg/Munich 82152, Germany.
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Abstract
A combination of genetic, environmental and lifestyle factors contributes to adverse effects on the reproductive health in men. Metals are pervasive in food, water, air, tobacco smoke, and alcoholic beverages. Experimental studies suggest that many metals have adverse effects on the male reproductive function. However, information about reproductive effects of human exposure to metals is scarce and/or inconsistent. This review summarises the information from epidemiological studies of the effects of metal exposure on reproductive function in men. Factors capable of affecting these relationships were identified and discussed. A particular attention is given to the studies considering influence of concomitant exposure to various metals. These studies have generally confirmed that even moderate- to low-level exposure to lead affects certain reproductive parameters, and that exposure to cadmium affects the prostate function and serum testosterone levels. Adverse effects of mercury, manganese, chromium and arsenic on semen quality and altered serum hormone are less well documented. There is no clear evidence that boron exposure may impair reproductive health in men. Only a few studies have investigated reproductive effects of concomitant exposure to several metals and controlled for potential confounders. Future studies should consider the contribution of combined exposure to various metals and/or other factors that may influence individual susceptibility to reproductive health impairment in men.
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Batke M, Aldenberg T, Escher S, Mangelsdorf I. Relevance of non-guideline studies for risk assessment: the coverage model based on most frequent targets in repeated dose toxicity studies. Toxicol Lett 2012; 218:293-8. [PMID: 22975263 DOI: 10.1016/j.toxlet.2012.09.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2012] [Revised: 08/31/2012] [Accepted: 09/03/2012] [Indexed: 11/17/2022]
Abstract
A common challenge for human risk assessment is the quality of the available animal studies. Non-guideline studies are often limited for different aspects of study design and documentation. Within this publication the relevance of a limited scope of examination is discussed. Preliminary analyses of the RepDose database have shown that liver, body weight, kidney and clinical symptoms are frequently affected in oral repeated dose toxicity in rats and mice (Bitsch et al., 2006), while many other targets are seldom affected. As most of these targets are investigated frequently also in non-guideline studies, it is likely that they provide a reliable NOEL, although the full spectrum of endpoints has not been covered. Based on RepDose data we investigate the relevance of individual targets for determining the LOEL and the consequences for risk assessment. The resulting coverage model for subchronic oral rat studies includes up to six targets and an additional assessment factor for LOEL extrapolation. It can be applied to assess the reliability of non-guideline studies with respect to the scope of examination. Furthermore the application of the coverage model to other databases will increase and/or specify the chemical domain and reveal respective targets as well as effects.
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Affiliation(s)
- M Batke
- Fraunhofer ITEM, Nikolai-Fuchs-Str. 1, 30625 Hannover, Germany.
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Impairment on sperm quality and fertility of adult rats after antiandrogen exposure during prepuberty. Reprod Toxicol 2012; 33:308-15. [DOI: 10.1016/j.reprotox.2011.12.011] [Citation(s) in RCA: 40] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/20/2011] [Revised: 12/12/2011] [Accepted: 12/16/2011] [Indexed: 11/17/2022]
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A regulatory approach to assess the potency of substances toxic to the reproduction. Regul Toxicol Pharmacol 2012; 63:97-105. [DOI: 10.1016/j.yrtph.2012.02.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/15/2011] [Revised: 02/26/2012] [Accepted: 02/27/2012] [Indexed: 11/18/2022]
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Aulmann W. Assessment of reproductive toxicity under REACH. Regul Toxicol Pharmacol 2012; 63:286-90. [PMID: 22475931 DOI: 10.1016/j.yrtph.2012.03.003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2011] [Revised: 02/29/2012] [Accepted: 03/06/2012] [Indexed: 10/28/2022]
Abstract
The European REACH regulation requires the evaluation of reproductive toxicity in screening tests according to OECD TG 421 and 422 for substances above the tonnage level of 10 tons/year. The overall aim of this paper is to increase flexibility in combination with a reduced number of experimental animals. Therefore, in contrast to the existing approach the registrant should have the possibility to file a dossier for a substance at the level of 10 tons/year and above also on the basis of data from a developmental toxicity study (OECD TG 414) plus a full-scale subacute toxicity study (OECD TG 407 according to the 1995 protocol). The proposed new test strategy takes into account overall considerations of duty of care and animal welfare. It enables an assessment of developmental toxicity on a definitive instead of a screening level. Registrants should be allowed to select between these two options, either the existing approach (OECD TG 421/407 and alternatively TG 422) or the approach proposed in this paper (OECD TG 407 plus TG 414).
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Affiliation(s)
- Walter Aulmann
- Ecolab Deutschland GmbH, Reisholzer Werftstr. 38-42, 40554 Düsseldorf, Germany.
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Sasaki JC, Chapin RE, Hall DG, Breslin W, Moffit J, Saldutti L, Enright B, Seger M, Jarvi K, Hixon M, Mitchard T, Kim JH. Incidence and nature of testicular toxicity findings in pharmaceutical development. ACTA ACUST UNITED AC 2012; 92:511-25. [PMID: 22162370 DOI: 10.1002/bdrb.20338] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Abstract
BACKGROUND Testicular toxicity (TT) is a sporadic and challenging issue in pharmaceutical drug development. Efforts to develop TT screening assays or biomarkers have been overshadowed by consortium efforts to predict drug-induced toxicities such as hepatic injury, which are encountered more frequently. METHODS To gauge the current state of the field and to prioritize future TT activities, the International Life Sciences Institute-Health and Environmental Sciences Institute Developmental and Reproductive Toxicology (DART) Technical Committee sponsored a survey to better understand the incidence and nature of TT findings encountered during drug development. RESULTS Highlights from the 16 survey respondents include: (1) Although preclinical TT was encountered relatively infrequently, half of the participants observed repeated problems with TT during pharmaceutical development, (2) despite control measures such as use of sexually mature animals to diminish confounding effects of spurious lesions, interpretation of TT remains a challenge, (3) "traditional" evaluation tools such as hormonal monitoring and newer approaches such as -omics are utilized to investigate testicular changes, and (4) an understanding of the risk and relevance of TT findings is achieved through joint consideration of factors such as species specificity, potential mode of action, and safety margins. CONCLUSIONS TT remains a relatively uncommon but persistent challenge in pharmaceutical development. Although current preclinical TT approaches appear to be effective in limiting the occurrence of pharmaceutical candidate attrition in clinical trials, improved biomarker or screening platforms would allow companies to identify TT at an earlier stage, thus decreasing the time and resources expended on safety evaluation of pharmaceutical candidates.
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Affiliation(s)
- Jennifer C Sasaki
- Johnson & Johnson Pharmaceutical Research and Development, Raritan, New Jersey.
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Poole A, Saghir SA. Diiodomethyl-p-tolylsulfone: evaluation of the mode of action for reproductive toxicity. Regul Toxicol Pharmacol 2011; 62:504-12. [PMID: 22166729 DOI: 10.1016/j.yrtph.2011.11.014] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2011] [Revised: 11/14/2011] [Accepted: 11/28/2011] [Indexed: 11/29/2022]
Abstract
The mode of action (MOA) underpinning the reproductive toxicity of diiodomethyl-p-tolylsulfone (DIMPTS) is excess systemic iodine levels, resulting in hypothyroidism. This MOA evaluation also addresses the potential for toxicity and adverse health outcomes during critical windows of development for different tissues. The data indicate that testicular development in the neonate represents the tissue and life-stage that are most sensitive to iodine toxicity. Life-stage specific dosimetry appears to be a major determinant of this sensitivity, with the neonate being exposed to higher levels of iodine than the fetus during the period of testicular development, in particular Sertoli cell maturation and differentiation. While no reports could be found in the literature linking excess iodine exposure in humans to testicular toxicity, there is evidence that neonates born to mothers with excessive iodine intake do exhibit signs of transient hypothyroidism. Although there are major physiological and temporal differences in testicular development and Sertoli cell replication between the rat and human, it is not inconceivable that continuous long term exposures to excess iodine first from maternal milk and then in the diet through to the onset of puberty could affect testicular development. However, exposures to iodinated substances - such as DIMPTS - contribute less than 1% of the required daily iodine intake for normal fetal and neonatal development and, consequently, continuous exposure to excess iodine during the pre-pubertal period is unlikely. As exposures to DIMPTS are both very low and sporadic in nature it is not likely that they represent any risk to health at any life-stage.
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Affiliation(s)
- Alan Poole
- Toxicology and Environmental Research and Consulting, Dow Europe GmbH, Bachtobelstrasse 3, CH-8810 Horgen, Switzerland.
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Sharma R, Chauhan P, Fulia A. Atrazine Induced Morphological Alterations in Spermatocytes of Goat in vitro. JOURNAL OF MEDICAL SCIENCES 2011. [DOI: 10.3923/jms.2011.177.184] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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