1
|
Nirmal B, Kumar KP, Koppula S. An Improved Process for Industrial Production of n-Propyl Bromide. RUSS J APPL CHEM+ 2021. [DOI: 10.1134/s1070427221050189] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
|
2
|
Ma Y, He X, Qi K, Wang T, Qi Y, Cui L, Wang F, Song M. Effects of environmental contaminants on fertility and reproductive health. J Environ Sci (China) 2019; 77:210-217. [PMID: 30573085 DOI: 10.1016/j.jes.2018.07.015] [Citation(s) in RCA: 92] [Impact Index Per Article: 15.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2018] [Revised: 07/20/2018] [Accepted: 07/30/2018] [Indexed: 06/09/2023]
Abstract
Recent research indicates that the human infertility rate is increasing. Although various reasons have been hypothesized for the growing infertility rate, environmental contaminants are potentially important causal agents associated with this change. Chemical contaminants are widespread throughout our environment and human exposure is virtually unavoidable. The overall contribution of environmental exposure to infertility is unknown, but studies involving occupational exposure, together with results from animal experiments, suggest that environmental contaminants may adversely affect fertility. We reviewed the adverse effects of environmental exposure on fertility and related reproductive outcomes. Environmental contaminants covered in this review include heavy metals, organic solvents, pesticides and endocrine disrupting chemicals. It is hoped that this review will highlight the need for further research in this area.
Collapse
Affiliation(s)
- Yanmin Ma
- Reproductive Center, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing 100026, China
| | - Xin He
- Reproductive Center, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing 100026, China
| | - Keyan Qi
- Department of Clinical Laboratory, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing 100026, China
| | - Tong Wang
- Reproductive Center, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing 100026, China
| | - Yongchao Qi
- Reproductive Center, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing 100026, China
| | - Lele Cui
- Reproductive Center, Beijing Obstetrics and Gynecology Hospital, Capital Medical University, Beijing 100026, China
| | - Fengbang Wang
- Key Laboratory of Environmental Nanotechnology and Health Effects, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China
| | - Maoyong Song
- Key Laboratory of Environmental Nanotechnology and Health Effects, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
| |
Collapse
|
3
|
Vabre P, Gatimel N, Moreau J, Gayrard V, Picard-Hagen N, Parinaud J, Leandri RD. Environmental pollutants, a possible etiology for premature ovarian insufficiency: a narrative review of animal and human data. Environ Health 2017; 16:37. [PMID: 28388912 PMCID: PMC5384040 DOI: 10.1186/s12940-017-0242-4] [Citation(s) in RCA: 167] [Impact Index Per Article: 20.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2016] [Accepted: 03/22/2017] [Indexed: 05/10/2023]
Abstract
BACKGROUND Because only 25% of cases of premature ovarian insufficiency (POI) have a known etiology, the aim of this review was to summarize the associations and mechanisms of the impact of the environment on this pathology. Eligible studies were selected from an electronic literature search from the PUBMED database from January 2000 to February 2016 and associated references in published studies. Search terms included ovary, follicle, oocyte, endocrine disruptor, environmental exposure, occupational exposure, environmental contaminant, pesticide, polyaromatic hydrocarbon, polychlorinated biphenyl PCB, phenol, bisphenol, flame retardant, phthalate, dioxin, phytoestrogen, tobacco, smoke, cigarette, cosmetic, xenobiotic. The literature search was conducted in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) guidelines. We have included the human and animal studies corresponding to the terms and published in English. We have excluded articles that included results that did not concern ovarian pathology and those focused on ovarian cancer, polycystic ovary syndrome, endometriosis or precocious puberty. We have also excluded genetic, auto-immune or iatrogenic causes from our analysis. Finally, we have excluded animal data that does not concern mammals and studies based on results from in vitro culture. Data have been grouped according to the studied pollutants in order to synthetize their impact on follicular development and follicular atresia and the molecular pathways involved. Ninety-seven studies appeared to be eligible and were included in the present study, even though few directly address POI. Phthalates, bisphenol A, pesticides and tobacco were the most reported substances having a negative impact on ovarian function with an increased follicular depletion leading to an earlier age of menopause onset. These effects were found when exposure occured at different times throughout the lifetime from the prenatal to the adult period, possibly due to different mechanisms. The main mechanism seemed to be an increase in atresia of pre-antral follicles. CONCLUSION Environmental pollutants are probably a cause of POI. Health officials and the general public must be aware of this environmental effect in order to implement individual and global preventive actions.
Collapse
Affiliation(s)
- Pauline Vabre
- Médecine de la Reproduction, CHU de Toulouse, Hôpital Paule de Viguier, 330 avenue de Grande Bretagne, F-31059 Toulouse Cedex, France
| | - Nicolas Gatimel
- Médecine de la Reproduction, CHU de Toulouse, Hôpital Paule de Viguier, 330 avenue de Grande Bretagne, F-31059 Toulouse Cedex, France
- Université de Toulouse; UPS; Groupe de Recherche en Fertilité Humaine (EA 3694, Human Fertility Research Group), F-31059 Toulouse, France
| | - Jessika Moreau
- Médecine de la Reproduction, CHU de Toulouse, Hôpital Paule de Viguier, 330 avenue de Grande Bretagne, F-31059 Toulouse Cedex, France
| | - Véronique Gayrard
- Institut National de Recherche Agronomique, Unité Mixte de Recherche 1331, Toxalim, Research Center in Food Toxicology, F-31027 Toulouse, France
- Université de Toulouse, Institut National Polytechnique de Toulouse, Ecole Nationale Vétérinaire de Toulouse, Ecole d’Ingénieurs de Purpan, Université Paul Sabatier, F-31076 Toulouse, France
| | - Nicole Picard-Hagen
- Institut National de Recherche Agronomique, Unité Mixte de Recherche 1331, Toxalim, Research Center in Food Toxicology, F-31027 Toulouse, France
- Université de Toulouse, Institut National Polytechnique de Toulouse, Ecole Nationale Vétérinaire de Toulouse, Ecole d’Ingénieurs de Purpan, Université Paul Sabatier, F-31076 Toulouse, France
| | - Jean Parinaud
- Médecine de la Reproduction, CHU de Toulouse, Hôpital Paule de Viguier, 330 avenue de Grande Bretagne, F-31059 Toulouse Cedex, France
- Université de Toulouse; UPS; Groupe de Recherche en Fertilité Humaine (EA 3694, Human Fertility Research Group), F-31059 Toulouse, France
| | - Roger D. Leandri
- Médecine de la Reproduction, CHU de Toulouse, Hôpital Paule de Viguier, 330 avenue de Grande Bretagne, F-31059 Toulouse Cedex, France
- Université de Toulouse; UPS; Groupe de Recherche en Fertilité Humaine (EA 3694, Human Fertility Research Group), F-31059 Toulouse, France
| |
Collapse
|
4
|
Merkin SS, Phy JL, Sites CK, Yang D. Environmental determinants of polycystic ovary syndrome. Fertil Steril 2016; 106:16-24. [DOI: 10.1016/j.fertnstert.2016.05.011] [Citation(s) in RCA: 92] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 05/03/2016] [Accepted: 05/16/2016] [Indexed: 12/17/2022]
|
5
|
Easley CA, Bradner JM, Moser A, Rickman CA, McEachin ZT, Merritt MM, Hansen JM, Caudle WM. Assessing reproductive toxicity of two environmental toxicants with a novel in vitro human spermatogenic model. Stem Cell Res 2015; 14:347-55. [PMID: 25863443 DOI: 10.1016/j.scr.2015.03.002] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/04/2014] [Revised: 03/16/2015] [Accepted: 03/17/2015] [Indexed: 11/26/2022] Open
Abstract
Environmental influences and insults by reproductive toxicant exposure can lead to impaired spermatogenesis or infertility. Understanding how toxicants disrupt spermatogenesis is critical for determining how environmental factors contribute to impaired fertility. While current animal models are available, understanding of the reproductive toxic effects on human fertility requires a more robust model system. We recently demonstrated that human pluripotent stem cells can differentiate into spermatogonial stem cells/spermatogonia, primary and secondary spermatocytes, and haploid spermatids; a model that mimics many aspects of human spermatogenesis. Here, using this model system, we examine the effects of 2-bromopropane (2-BP) and 1,2,dibromo-3-chloropropane (DBCP) on in vitro human spermatogenesis. 2-BP and DBCP are non-endocrine disrupting toxicants that are known to impact male fertility. We show that acute treatment with either 2-BP or DBCP induces a reduction in germ cell viability through apoptosis. 2-BP and DBCP affect viability of different cell populations as 2-BP primarily reduces spermatocyte viability, whereas DBCP exerts a much greater effect on spermatogonia. Acute treatment with 2-BP or DBCP also reduces the percentage of haploid spermatids. Both 2-BP and DBCP induce reactive oxygen species (ROS) formation leading to an oxidized cellular environment. Taken together, these results suggest that acute exposure with 2-BP or DBCP causes human germ cell death in vitro by inducing ROS formation. This system represents a unique platform for assessing human reproductive toxicity potential of various environmental toxicants in a rapid, efficient, and unbiased format.
Collapse
Affiliation(s)
- Charles A Easley
- Laboratory of Translational Cell Biology, Department of Cell Biology, Emory University School of Medicine, Atlanta, GA 30322, USA.
| | - Joshua M Bradner
- Department of Environmental Health, Rollins School of Public Heath, Emory University, Atlanta, GA 30322, USA; Center for Neurodegenerative Disease, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Amber Moser
- Laboratory of Translational Cell Biology, Department of Cell Biology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Chelsea A Rickman
- Laboratory of Translational Cell Biology, Department of Cell Biology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Zachary T McEachin
- Laboratory of Translational Cell Biology, Department of Cell Biology, Emory University School of Medicine, Atlanta, GA 30322, USA; Wallace H. Coulter Department of Biomedical Engineering, Georgia Tech College of Engineering, Atlanta, GA 30332, USA
| | - Megan M Merritt
- Laboratory of Translational Cell Biology, Department of Cell Biology, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - Jason M Hansen
- Division of Pulmonology, Department of Pediatrics, Emory University School of Medicine, Atlanta, GA 30322, USA
| | - W Michael Caudle
- Department of Environmental Health, Rollins School of Public Heath, Emory University, Atlanta, GA 30322, USA; Center for Neurodegenerative Disease, Emory University School of Medicine, Atlanta, GA 30322, USA
| |
Collapse
|
6
|
Risks associated with premature ovarian failure in Han Chinese women. Reprod Biomed Online 2015; 30:401-7. [PMID: 25682306 DOI: 10.1016/j.rbmo.2014.12.013] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2014] [Revised: 12/17/2014] [Accepted: 12/17/2014] [Indexed: 01/09/2023]
Abstract
In this retrospective study, the relationship between demographic characteristics, past medical history, general lifestyle habits and susceptibility of premature ovarian failure (POF) in Han Chinese population was investigated. Five hundred and fifty-three patients with POF and 400 women with normal ovarian function were recruited. A questionnaire was designed to gather information from responders. Logistic regression was carried out to calculate odds ratios (OR), 95% confidence intervals (95% CI) and P-values. History of pelvic surgery, mumps, having relatives with menstrual abnormalities and exposure to chemical agents were significantly associated with increased risk of POF (OR 5.53 [2.15 to 14.23]; 3.26 [2.38 to 4.47]; 28.12 [8.84 to 89.46]; 4.47 [2.09 to 9.58]). Vegetarian diet, tea and mineral water consumption reduced the risk of POF (OR 0.27 [0.19 to 0.37]; 0.04 [0.03 to 0.07]; 0.63 [0.47 to 0.85], respectively). Heredity, pelvic surgery, mumps and exposure to chemical agents were identified as risk factors for POF, whereas vegetarian diet, tea consumption and mineral water drinking were protective. Therefore, genetic consultation could help those women whose relatives manifested an early or premature menopause to avoid the consequences of possible premature ovarian function cessation. Avoidance of exposure to endocrine disrupters and flavonoids intake should be considered.
Collapse
|
7
|
Hoyer PB, Keating AF. Xenobiotic effects in the ovary: temporary versus permanent infertility. Expert Opin Drug Metab Toxicol 2014; 10:511-23. [DOI: 10.1517/17425255.2014.880690] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
|
8
|
Béranger R, Hoffmann P, Christin-Maitre S, Bonneterre V. Occupational exposures to chemicals as a possible etiology in premature ovarian failure: a critical analysis of the literature. Reprod Toxicol 2012; 33:269-79. [PMID: 22281303 DOI: 10.1016/j.reprotox.2012.01.002] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2011] [Revised: 12/15/2011] [Accepted: 01/10/2012] [Indexed: 01/25/2023]
Abstract
Premature ovarian failure (POF) is a cause of infertility that affects about 1% of women under 40, and is considered as idiopathic in 75% of cases. An occupational chemical origin has been identified at least once with 2-bromopropane, but human studies are rare and experimental data are sparse. This review aims to carry out a critical synthesis of knowledge of the chemical agents likely to affect follicular stock in humans and/or animals, by direct toxicity to follicles, or by increasing their recruitments. Of 140 chemical agents (or groups) studied, 20 have been identified as potentially damaging to the ovarian reserve. For the majority of toxic agents, only experimental data are currently available. At least four of these agents are likely to lead to POF in descendents (ethylene glycol methyl ether; 2,2-bis(bromomethyl)-1,3-propanediol; benzo[a]pyrene; dimethylbenzantracene). We propose a strategy aiming to encourage progress in identifying occupational factors responsible for POF.
Collapse
Affiliation(s)
- Rémi Béranger
- UJF-Grenoble 1/CNRS/TIMC-IMAG UMR 5525 (EPSP Team: Environnement et Prédiction de la Santé des Populations), Grenoble F-38041, France.
| | | | | | | |
Collapse
|
9
|
Mark-Kappeler CJ, Hoyer PB, Devine PJ. Xenobiotic effects on ovarian preantral follicles. Biol Reprod 2011; 85:871-83. [PMID: 21697514 PMCID: PMC3197911 DOI: 10.1095/biolreprod.111.091173] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2011] [Revised: 02/16/2011] [Accepted: 05/17/2011] [Indexed: 01/30/2023] Open
Abstract
Women are born with a finite population of ovarian follicles, which are slowly depleted during their reproductive years until reproductive failure (menopause) occurs. The rate of loss of primordial follicles is determined by genetic and environmental influences, but certain toxic exposures can accelerate this process. Ionizing radiation reduces preantral follicle numbers in rodents and humans in a dose-dependent manner. Cigarette smoking is linked to menopause occurring 1-4 yr earlier than with nonsmokers, and components of smoke, polycyclic aromatic hydrocarbons, can cause follicle depletion in rodents or in ovaries in vitro. Chemotherapeutic agents, such as alkylating drugs and cisplatin, also cause loss of preantral ovarian follicles. Effects depend on dose, type, and reactivity of the drug, and the age of the individual. Evidence suggests DNA damage may underlie follicle loss induced by one common alkylating drug, cyclophosphamide. Occupational exposures have also been linked to ovarian damage. In an industrial setting, 2-bromopropane caused infertility in men and women, and it can induce ovarian follicle depletion in rats. Solvents, such as butadiene, 4-vinylcyclohexene, and their diepoxides, can also cause specific preantral follicle depletion. The mechanism(s) underlying effects of the latter compound may involve alterations in apoptosis, survival factors such as KIT/Kit Ligand, and/or the cellular signaling that maintains primordial follicle dormancy. Estrogenic endocrine disruptors may alter follicle formation/development and impair fertility or normal development of offspring. Thus, specific exposures are known or suspected of detrimentally impacting preantral ovarian follicles, leading to early ovarian failure.
Collapse
|
10
|
Lee SK, Kang MJ, Jeon TW, Ha HW, Yoo JW, Ko GS, Kang W, Jeong HG, Lyoo WS, Jeong TC. Role of metabolism in 1-bromopropane-induced hepatotoxicity in mice. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2010; 73:1431-1440. [PMID: 20954070 DOI: 10.1080/15287394.2010.511546] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
A possible role of metabolism in 1-bromopropane (1-BP)-induced hepatotoxicity was investigated in male ICR mice. The depletion of glutathione (GSH) by formation of GSH conjugates was associated with increased hepatotoxicity in 1-BP-treated mice. The formation of S-propyl and 2-hydroxypropyl GSH conjugates were identified in the liver following 1-BP treatment. In addition, the formation of reactive metabolites of 1-BP by certain cytochrome P-450 (CYP) may be involved in 1-BP-induced hepatotoxicity. The decreased content of hepatic GSH produced by 1-BP was associated not only with increased activities of alanine aminotransferase (ALT) and aspartate aminotransferase (AST) but also with elevated levels of hepatic thiobarbituric acid-reactive substance (TBARS) in mice where metabolic enzymes were induced by pretreatment with phenobarbital. In addition, the hepatotoxicity induced by 1-BP was prevented by pretreatment with SKF-525A. Taken together, the formation of reactive metabolites by CYP and depletion of GSH may play important roles in hepatotoxicity induced by 1-BP.
Collapse
Affiliation(s)
- Sang Kyu Lee
- College of Pharmacy, Yeungnam University, Gyeongsan, Korea
| | | | | | | | | | | | | | | | | | | |
Collapse
|
11
|
Hoang YD, Nakamura BN, Luderer U. Follicle-stimulating hormone and estradiol interact to stimulate glutathione synthesis in rat ovarian follicles and granulosa cells. Biol Reprod 2009; 81:636-46. [PMID: 19516019 DOI: 10.1095/biolreprod.109.078378] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
Glutathione (GSH), the most abundant intracellular nonprotein thiol, is critical for many cellular functions. The rate-limiting step in GSH synthesis is catalyzed by glutamate cysteine ligase (GCL), a heterodimer composed of a catalytic (GCLC) and a modifier (GCLM) subunit. The tissue-specific regulation of GSH synthesis is poorly understood. We showed previously that gonadotropin hormones regulate ovarian GSH synthesis. In the present study, we sought to clarify the ovarian cell type-specific effects of follicle-stimulating hormone (FSH) and estradiol on GSH synthesis. Immature female rats were treated with estradiol to stimulate development of small antral follicles. Granulosa cells (GCs) from these follicles or whole follicles were cultured in serum-free media, with or without FSH and 17beta-estradiol. The GSH and GCLC protein and mRNA levels increased in GCs treated with FSH alone. The effects of FSH on GCLC and GCLM protein and mRNA levels, GCL enzymatic activity, and GSH concentrations in GCs were significantly enhanced by the addition of estradiol. Estradiol alone had no effects on GSH. Dibromo-cAMP mimicked and protein kinase A (PKA) inhibitors prevented FSH stimulation of GCL subunit protein levels. In cultured small antral follicles, FSH stimulated estradiol synthesis and robustly increased GCL subunit mRNA and protein levels and GSH concentrations. The GCL subunit mRNA expression increased in both the granulosa cells and theca cells of follicles with FSH stimulation. These data demonstrate that maximal stimulation of GSH synthesis by FSH in granulosa cells and follicles requires estradiol. Without estradiol, FSH causes lesser increases in GCL subunit expression via a PKA-dependent pathway.
Collapse
Affiliation(s)
- Yvonne D Hoang
- Departments of Medicine and Developmental and Cell Biology, University of California Irvine, Irvine, California, USA
| | | | | |
Collapse
|
12
|
Huang F, Ning H, Xin QQ, Huang Y, Wang H, Zhang ZH, Xu DX, Ichihara G, Ye DQ. Melatonin pretreatment attenuates 2-bromopropane-induced testicular toxicity in rats. Toxicology 2009; 256:75-82. [DOI: 10.1016/j.tox.2008.11.005] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2008] [Revised: 11/05/2008] [Accepted: 11/05/2008] [Indexed: 10/21/2022]
|
13
|
Lee SK, Jeon TW, Kim YB, Lee ES, Jeong HG, Jeong TC. Role of glutathione conjugation in the hepatotoxicity and immunotoxicity induced by 1-bromopropane in female BALB/c mice. J Appl Toxicol 2007; 27:358-67. [PMID: 17265426 DOI: 10.1002/jat.1214] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
1-Bromopropane (1-BP) is used as a cleaning agent or adhesive solvent in the workplace. In the present study, the hepatotoxic and immunotoxic effects of 1-bromopropane and its conjugation with glutathione (GSH) were investigated in female BALB/c mice. The animals were treated orally with 200, 500 and 1000 mg kg(-1) of 1-BP in corn oil for a dose response study or treated orally with 1000 mg kg(-1) of 1-BP for 6, 12, 24 and 48 h for a time course study. The hepatic and splenic contents of GSH were significantly decreased by 1-BP in a dose-dependent manner. S-propyl GSH was identified in livers following treatment with 1-BP by liquid chromatography-electrospray ionization tandem mass spectrometry. When the production of conjugates from 1-BP was investigated in livers following oral treatment with 1000 mg kg(-1) of 1-BP for 6, 12, 24 and 48 h, the GSH conjugates were detected maximally 6 h after treatment. Treatment of mice with 1-BP increased the serum activity of alanine aminotransferase dose-dependently. The oral 1-BP treatment significantly suppressed the antibody response to a T-dependent antigen and the production of splenic intracellular IL-2 in response to Con A in a dose-dependent manner. The present results suggested that 1-BP could cause hepatotoxicity and immunotoxicity as well as depletion of GSH content due to the formation of GSH conjugates.
Collapse
Affiliation(s)
- Sang Kyu Lee
- College of Pharmacy, Yeungnam University, Gyeongsan, 712-749, South Korea
| | | | | | | | | | | |
Collapse
|
14
|
Winker R, Rüdiger HW. Reproductive toxicology in occupational settings: an update. Int Arch Occup Environ Health 2005; 79:1-10. [PMID: 16010576 DOI: 10.1007/s00420-005-0011-5] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2004] [Accepted: 04/28/2005] [Indexed: 11/26/2022]
Abstract
OBJECTIVE This article mainly attempts to review the recent human literature on the adverse effects of occupational factors on fertility, developmental effects and genetic changes in the germ line, which lead to genetic malformations or to genetic disease. The secondary study aim is to answer whether occupational exposures are quantitative momentously for 15% involuntarily childless couples, 10-20% spontaneous abortions and 3% birth defects. METHODS A literature survey was conducted for publications on these subjects focusing on the latest publications. PubMed (Medline. 2005) was used for this literature search. RESULTS Publication bias and a large amount of confounding factors, which have to be controlled, make the design of human fertility studies difficult. Epidemiologic studies using time to conception techniques have been useful in identifying substances and exposure scenarios with proven toxic effect on fertility. The collected studies suggest that the exposure to the following substances or occupational settings may affect fertility function: lead, organic mercury compounds, manganese, carbon disulfide, 2-bromopropane and dibromochloropropane, welding, professional driving and working with heat. Concerning developmental effects even for methyl mercury, which was in group A of the German MAK list, to date no reliable evidence of the damaging effect on the human fetus under actual work conditions has been obtained. It is also difficult to classify substances according to their mutagenic potential for the germ cell, since no direct evidence of an association between exposure against a physical or chemical pollutant and the occurrence of a hereditary disorder has been found yet. CONCLUSION In conclusion there are only a few substances which may affect reproductive function in the workplace without a doubt. The decreasing fertility of women in Western countries can be explained by the increasing female reproduction age, rather than by occupational exposures. Also the rates for spontaneous abortions and birth defects cannot be explained by industrial exposures at the workplace.
Collapse
Affiliation(s)
- R Winker
- Division of Occupational Medicine, Medical University of Vienna, Währinger Gürtel 18-20, 1090, Vienna, Austria.
| | | |
Collapse
|