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Kim MR, Jung MK, Jee HM, Ha EK, Lee S, Han MY, Yoo EG. The association between phthalate exposure and pubertal development. Eur J Pediatr 2024; 183:1675-1682. [PMID: 38206396 DOI: 10.1007/s00431-023-05416-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/31/2023] [Revised: 12/19/2023] [Accepted: 12/30/2023] [Indexed: 01/12/2024]
Abstract
Antiandrogenic effect of phthalates have been reported; however, results regarding the effect of phthalate exposure in pubertal children have been inconsistent. We aimed to investigate the relationship between phthalate exposure and pubertal development, especially whether high molecular weight phthalates (HMWP) and low molecular weight phthalates (LMWP) are differently associated in boys and girls. Urinary phthalate metabolites (4 HMWPs and 3 LMWPs) in Korean children (236 boys and 202 girls, aged 10 to 12 years) were measured. The association between phthalate levels and pubertal development (pubertal stages self-reported by parents and sex steroid levels) was analyzed by generalized linear regression after adjusting for age, body mass index z score, and premature birth and/or low birth weight. Both the highest quartile of HMWP (Q4 vs Q1, adjusted odds ratio [OR], 0.238; 95% confidence interval [CI], 0.090-0.627; p = 0.004) and LMWP (Q4 vs Q1, adjusted OR, 0.373; 95% CI, 0.151-0.918; p = 0.032) were inversely associated with pubertal stages in boys, whereas the highest quartile of LMWP (Q4 vs Q1, adjusted OR, 2.431; 95% CI, 1.024-5.768; p = 0.044) was significantly related to advanced pubertal stages in girls. Testosterone levels in boys were significantly lower at the highest quartile of HMWP (adjusted β = - 0.251; 95% CI, - 0.476 to - 0.027; p = 0.028). However, in girls, we could not find any significant relationship between HMWP or LMWP and estradiol levels. CONCLUSIONS Our results suggest that phthalate exposure, especially exposure to the HMWP, may have inverse association with male pubertal development. Further investigation is required to verify the relationship of phthalate exposure and pubertal development in girls. WHAT IS KNOWN • Exposure to phthalates may have antiandrogenic effects. • Studies on the association between phthalates and pubertal development have yielded inconsistent results. WHAT IS NEW • Phthalate levels were inversely associated with self-reported pubertal stages in boys. • Exposure to phthalates might have a negative influence on male pubertal development.
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Affiliation(s)
- Mi Ra Kim
- Department of Pediatrics, CHA Ilsan Medical Center, CHA University School of Medicine, Goyang, Korea
| | - Mo Kyung Jung
- Department of Pediatrics, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Korea
| | - Hye Mi Jee
- Department of Pediatrics, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Korea
| | - Eun Kyo Ha
- Department of Pediatrics, Kangnam Sacred Heart Hospital, Hallym University Medical Center, Seoul, Korea
| | - Sanghoo Lee
- Center for Companion Biomarker, Seoul Clinical Laboratories Healthcare, Yongin, Korea
| | - Man Yong Han
- Department of Pediatrics, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Korea.
| | - Eun-Gyong Yoo
- Department of Pediatrics, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Korea.
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Toxicology and carcinogenesis studies of di(2-ethylhexyl) phthalate administered in feed to Sprague Dawley (Hsd:Sprague Dawley SD) rats. NATIONAL TOXICOLOGY PROGRAM TECHNICAL REPORT SERIES 2021:NTP-TR-601. [PMID: 35073286 PMCID: PMC8996106 DOI: 10.22427/ntp-tr-601] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
Abstract
Di(2-ethylhexyl) phthalate (DEHP) is a member of the phthalate ester chemical class that occurs commonly in the environment and to which humans are widely exposed. Lifetime exposure to DEHP is likely to occur, including during the in utero and early postnatal windows of development. To date, no carcinogenicity assessments of DEHP have used a lifetime exposure paradigm that includes the perinatal period (gestation and lactation). The National Toxicology Program (NTP) tested the hypothesis that exposure during the perinatal period would alter the DEHP carcinogenic response quantitatively (more neoplasms) or qualitatively (different neoplasm types). Two chronic carcinogenicity assessments of DEHP were conducted in which Sprague Dawley (Hsd:Sprague Dawley SD) rats were exposed to dosed feed containing 0, 300, 1,000, 3,000, or 10,000 ppm DEHP for 2 years using different exposure paradigms. In Study 1, groups of 45 F0 time-mated females were provided dosed feed beginning on gestation day (GD) 6 through lactation. On postnatal day (PND) 21, groups of 50 F1 rats per sex continued on the study and were provided dosed feed containing the same DEHP concentration as their respective dam for 2 years. In Study 2, groups of 50 rats per sex, aged 6 to 7 weeks at study start, were provided dosed feed containing DEHP for 2 years. (Abstract Abridged).
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Enangue Njembele AN, Tremblay JJ. Mechanisms of MEHP Inhibitory Action and Analysis of Potential Replacement Plasticizers on Leydig Cell Steroidogenesis. Int J Mol Sci 2021; 22:ijms222111456. [PMID: 34768887 PMCID: PMC8584274 DOI: 10.3390/ijms222111456] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 10/13/2021] [Accepted: 10/22/2021] [Indexed: 11/16/2022] Open
Abstract
Steroid production in Leydig cells is stimulated mainly by the pituitary luteinizing hormone, which leads to increased expression of genes involved in steroidogenesis, including the gene encoding the steroidogenic acute regulatory (STAR) protein. Mono(2-ethylhexyl)phthalate (MEHP), the active metabolite of the widely used plasticizer DEHP, is known to disrupt Leydig steroidogenesis but its mechanisms of action remain poorly understood. We found that MEHP caused a significant reduction in hormone-induced steroid hormone production in two Leydig cell lines, MA-10 and MLTC-1. Consistent with disrupted cholesterol transport, we found that MEHP represses cAMP-induced Star promoter activity. MEHP responsiveness was mapped to the proximal Star promoter, which contains multiple binding sites for several transcription factors. In addition to STAR, we found that MEHP also reduced the levels of ferredoxin reductase, a protein essential for electron transport during steroidogenesis. Finally, we tested new plasticizers as alternatives to phthalates. Two plasticizers, dioctyl succinate and 1,6-hexanediol dibenzoate, had no significant effect on hormone-induced steroidogenesis. Our current findings reveal that MEHP represses steroidogenesis by affecting cholesterol transport and its conversion into pregnenolone. We also found that two novel molecules with desirable plasticizer properties have no impact on Leydig cell steroidogenesis and could be suitable phthalate replacements.
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Affiliation(s)
- Annick N. Enangue Njembele
- Reproduction, Mother and Child Health, Room T3-67, Centre de Recherche du CHU de Québec–Université Laval CHUL 2705 Laurier Blvd., Québec City, QC G1V 4G2, Canada;
| | - Jacques J. Tremblay
- Reproduction, Mother and Child Health, Room T3-67, Centre de Recherche du CHU de Québec–Université Laval CHUL 2705 Laurier Blvd., Québec City, QC G1V 4G2, Canada;
- Centre for Research in Reproduction, Development and Intergenerational Health, Department of Obstetrics, Gynecology, and Reproduction, Faculty of Medicine, Université Laval, Québec City, QC G1V 0A6, Canada
- Correspondence: ; Tel.: +1-418-525-4444 (ext. 46254)
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Erkekoglu P, Özyurt A, Yirün A, Çakır D. Testicular dysgenesis syndrome and phthalate exposure: A review of literature. ARHIV ZA FARMACIJU 2021. [DOI: 10.5937/arhfarm71-34438] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022] Open
Abstract
Endocrine disruptors are chemicals that interfere with the body's endocrine system and cause adverse effects in biological systems. Phthalates are a group of man-made chemicals which are mainly used as plasticizers and classified as endocrine disruptors. They are also used in cosmetic and personal care products as color or smell fixators. Moreover, phthalates are present in inks, adhesives, sealants, automobile parts, tools, toys, carpets, medical tubing and blood storage bags, and food packages. Pathological condition known as "testicular dysgenesis syndrome" (TDS) or "phthalate syndrome" is usually linked to phthalate exposure and is coined to describe the rise in alterations in reproductive health in men, such as reduced semen quality (decrease in sperm counts, sperm motility and increase in abnormal sperms), hypospadias, cryptorchidism, reduced anogenital distance and early-life testicular cancer. Phthalates are suggested to cause direct effect on gonadal and non-gonadal tissues, impair the differentiation and morphogenesis of seminiferous tubules and accessory sex organs and testicular cells (both Sertoli and Leydig cells), alter estradiol and/or testosterone levels, decrease insulin-like 3 (INSL3) peptide production, impair spermatogenesis and lead to epigenetic alterations, all of which may lead to TDS. This review will mainly focus on phthalates as causes of TDS and their mechanisms of action.
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Woodward MJ, Obsekov V, Jacobson MH, Kahn LG, Trasande L. Phthalates and Sex Steroid Hormones Among Men From NHANES, 2013-2016. J Clin Endocrinol Metab 2020; 105:dgaa039. [PMID: 31996892 PMCID: PMC7067547 DOI: 10.1210/clinem/dgaa039] [Citation(s) in RCA: 40] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/02/2019] [Accepted: 01/27/2020] [Indexed: 12/31/2022]
Abstract
CONTEXT Phthalates are commonly found in commercial packaging, solvents, vinyl, and personal care products, and there is concern for potential endocrine-disrupting effects in males. The commonly used di-2-ethylhexyl phthalate (DEHP) has progressively been replaced by seldom studied compounds, such as bis-2-ethylhexyl terephthalate and 1,2-cyclohexane dicarboxylic acid di-isononyl ester (DINCH). OBJECTIVE To investigate the associations between the urinary phthalate metabolites and serum sex steroid hormone concentrations in a nationally representative sample of adult males. DESIGN, SETTING, PARTICIPANTS, AND INTERVENTION This was a cross-sectional analysis of data from the 2013-2016 National Health and Nutrition Examination Survey among 1420 male participants aged ≥20 years. MAIN OUTCOME MEASURES Serum levels of total testosterone, estradiol, SHBG, and derived sex hormone measurements of free testosterone, bioavailable testosterone, and free androgen index were examined as log-transformed continuous variables. RESULTS Phthalate metabolites were not statistically significantly associated with sex hormone concentrations among all men. However, associations varied by age. High molecular weight phthalates were associated with lower total, free, and bioavailable testosterone among men age ≥60. Specifically, each doubling of ΣDEHP was associated with 7.72% lower total testosterone among older men (95% confidence interval, -12.76% to -2.39%). Low molecular phthalates were associated with lower total, free, and bioavailable testosterone among men age 20 to 39 and ∑DINCH was associated with lower total testosterone among men age ≥40. CONCLUSIONS Our results indicate that males may be vulnerable to different phthalate metabolites in age-specific ways. These results support further investigation into the endocrine-disrupting effects of phthalates.
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Affiliation(s)
- Miriam J Woodward
- Department of Pediatrics, Division of Environmental Pediatrics, NYU Langone Medical Center, New York, NY
| | - Vladislav Obsekov
- Department of Pediatrics, Division of Environmental Pediatrics, NYU Langone Medical Center, New York, NY
| | - Melanie H Jacobson
- Department of Pediatrics, Division of Environmental Pediatrics, NYU Langone Medical Center, New York, NY
| | - Linda G Kahn
- Department of Pediatrics, Division of Environmental Pediatrics, NYU Langone Medical Center, New York, NY
| | - Leonardo Trasande
- Department of Pediatrics, Division of Environmental Pediatrics, NYU Langone Medical Center, New York, NY
- Department of Population Health, NYU Langone Medical Center, New York, NY
- Department of Environmental Medicine, NYU Langone Medical Center, New York, NY
- NYU Wagner School of Public Service, New York, NY
- NYU College of Global Public Health, New York, NY
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6
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Park CG, Sung B, Ryu CS, Kim YJ. Mono-(2-ethylhexyl) phthalate induces oxidative stress and lipid accumulation in zebrafish liver cells. Comp Biochem Physiol C Toxicol Pharmacol 2020; 230:108704. [PMID: 31927120 DOI: 10.1016/j.cbpc.2020.108704] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Revised: 01/02/2020] [Accepted: 01/04/2020] [Indexed: 12/18/2022]
Abstract
The purpose of the present study was to examine the antioxidant and oxidative stress changes in zebrafish liver (ZFL) cells in the presence of mono-(2-ethylhexyl) phthalate (MEHP). When reactive oxygen species (ROS) and antioxidant levels were measured by immunoassay, significant differences were observed between MEHP-treated and control cells, while catalase levels did not change in any group. MEHP-treated cells had higher levels of ROS, glutathione peroxidase (GPx), glutathione S-transferase (GST), glutathione, and superoxide dismutase (SOD) than control cells. However, lower levels of lipid peroxidation were observed in MEHP-treated cells compared to control cells. After 24 h of MEHP treatment, ROS, SOD, GPx, and GST activity increased in a dose-dependent manner. Cellular lipid droplet formation and endoplasmic reticulum stress were both induced in the presence of MEHP. These findings demonstrated the potential impacts of the association of MEHP with adverse outcomes in fish liver. Future studies will focus on clarifying the molecular mechanism of phthalate toxicity via oxidative stress and peroxisome proliferator activated receptor as the major mechanistic pathway.
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Affiliation(s)
- Chang Gyun Park
- Environmental Safety Group, JRC-APT, KIST Europe Forschungsgesellschaft mbH, 66123 Saarbrücken, Germany
| | - Baeckkyoung Sung
- Environmental Safety Group, JRC-APT, KIST Europe Forschungsgesellschaft mbH, 66123 Saarbrücken, Germany; Division of Energy & Environment Technology, University of Science and Technology, 34113 Daejeon, Korea
| | - Chang Seon Ryu
- Environmental Safety Group, JRC-APT, KIST Europe Forschungsgesellschaft mbH, 66123 Saarbrücken, Germany.
| | - Young Jun Kim
- Environmental Safety Group, JRC-APT, KIST Europe Forschungsgesellschaft mbH, 66123 Saarbrücken, Germany; Division of Energy & Environment Technology, University of Science and Technology, 34113 Daejeon, Korea.
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Klejbor I, Mahmood S, Melka N, Ebertowska A, Morys J, Stachowiak EK, Stachowiak MK, Patel MS. Phenylbutyrate administration reduces changes in the cerebellar Purkinje cells population in PDC-deficient mice. Acta Neurobiol Exp (Wars) 2020. [DOI: 10.21307/ane-2020-027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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8
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Removal of phthalic acid esters from sea buckthorn (Hippophae rhamnoides L.) pulp oil by steam distillation and molecular distillation. Food Chem 2019; 294:572-577. [DOI: 10.1016/j.foodchem.2019.05.091] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2018] [Revised: 04/04/2019] [Accepted: 05/11/2019] [Indexed: 11/30/2022]
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Genetic resistance to DEHP-induced transgenerational endocrine disruption. PLoS One 2019; 14:e0208371. [PMID: 31181066 PMCID: PMC6557477 DOI: 10.1371/journal.pone.0208371] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2018] [Accepted: 05/15/2019] [Indexed: 02/07/2023] Open
Abstract
Di(2-ethylhexyl)phthalate (DEHP) interferes with sex hormones signaling pathways (SHP). C57BL/6J mice prenatally exposed to 300 mg/kg/day DEHP develop a testicular dysgenesis syndrome (TDS) at adulthood, but similarly-exposed FVB/N mice are not affected. Here we aim to understand the reasons behind this drastic difference that should depend on the genome of the strain. In both backgrounds, pregnant female mice received per os either DEHP or corn oil vehicle and the male filiations were examined. Computer-assisted sperm analysis showed a DEHP-induced decreased sperm count and velocities in C57BL/6J. Sperm RNA sequencing experiments resulted in the identification of the 62 most differentially expressed RNAs. These RNAs, mainly regulated by hormones, produced strain-specific transcriptional responses to prenatal exposure to DEHP; a pool of RNAs was increased in FVB, another pool of RNAs was decreased in C57BL/6J. In FVB/N, analysis of non-synonymous single nucleotide polymorphisms (SNP) impacting SHP identified rs387782768 and rs29315913 respectively associated with absence of the Forkhead Box A3 (Foxa3) RNA and increased expression of estrogen receptor 1 variant 4 (NM_001302533) RNA. Analysis of the role of SNPs modifying SHP binding sites in function of strain-specific responses to DEHP revealed a DEHP-resistance allele in FVB/N containing an additional FOXA1-3 binding site at rs30973633 and four DEHP-induced beta-defensins (Defb42, Defb30, Defb47 and Defb48). A DEHP-susceptibility allele in C57BL/6J contained five SNPs (rs28279710, rs32977910, rs46648903, rs46677594 and rs48287999) affecting SHP and six genes (Svs2, Svs3b, Svs4, Svs3a, Svs6 and Svs5) epigenetically silenced by DEHP. Finally, targeted experiments confirmed increased methylation in the Svs3ab promoter with decreased SEMG2 persisting across generations, providing a molecular explanation for the transgenerational sperm velocity decrease found in C57BL/6J after DEHP exposure. We conclude that the existence of SNP-dependent mechanisms in FVB/N inbred mice may confer resistance to transgenerational endocrine disruption.
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Bissegger S, Pineda Castro MA, Yargeau V, Langlois VS. Phthalates modulate steroid 5-reductase transcripts in the Western clawed frog embryo. Comp Biochem Physiol C Toxicol Pharmacol 2018; 213:39-46. [PMID: 30055282 DOI: 10.1016/j.cbpc.2018.07.005] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/03/2018] [Revised: 07/18/2018] [Accepted: 07/22/2018] [Indexed: 12/21/2022]
Abstract
Phthalates are used worldwide in the manufacturing of plastics, added to cosmetic products, personal care products, pharmaceuticals, medical devices, and paints; and are widely detected in soil, surface water, and organism tissues. Phthalate esters have been previously shown to interfere with the endocrine system in vertebrates. However, few studies have investigated the effects of phthalates on testosterone-converting enzymes that affect hormone levels and reproduction. In the present study, we exposed the Western clawed frog (Silurana tropicalis) to 0.1, 1, and 10 μM diethylhexyl phthalate (DEHP), dibutyl phthalate (DBP), and diethyl phthalate (DEP) during early amphibian embryonic development. Additional DBP exposures were conducted ex vivo using mature frog testes. Malformations and mRNA levels of genes associated to reproduction and oxidative stress were evaluated. 0.1 μM DEHP, DBP, and DEP induced an array of malformations, including incomplete gut coiling, edemas, and eye malformations. Moreover, all three phthalates increased the expression of androgen-related genes, such as steroid-5α-reductase 1, 2, 3, steroid-5β-reductase, and androgen receptor at concentrations ranging from 0.1 to 10 μM depending on the phthalate and gene. Data suggest that the phthalate esters tested are teratogens to the amphibian embryo and that these phthalates exhibit an androgenic activity in amphibians.
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Affiliation(s)
- Sonja Bissegger
- Chemistry and Chemical Engineering Department, Royal Military College of Canada, Kingston, ON, Canada
| | | | - Viviane Yargeau
- Chemical Engineering Department, McGill University, Montreal, QC, Canada
| | - Valerie S Langlois
- Chemistry and Chemical Engineering Department, Royal Military College of Canada, Kingston, ON, Canada; Institut de la recherche scientifique - Centre Eau Terre Environnement (INRS-ETE), Québec, QC, Canada.
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Wagner IV, Sahlin L, Savchuk I, Klöting N, Svechnikov K, Söder O. Adipose Tissue is a Potential Source of Hyperandrogenism in Obese Female Rats. Obesity (Silver Spring) 2018; 26:1161-1167. [PMID: 29901265 DOI: 10.1002/oby.22198] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/02/2018] [Revised: 03/06/2018] [Accepted: 04/02/2018] [Indexed: 12/12/2022]
Abstract
OBJECTIVE Obesity in females is often associated with metabolic complications and hyperandrogenism, but the sources of androgens are not completely understood. Therefore, this study investigated whether adipose tissue could be a source of androgens promoting hyperandrogenism development in obese female rats. METHODS Gene expression of steroidogenic enzymes and testosterone levels were determined in periovarian and inguinal adipose tissue and in the supernatant of cultured preadipocytes and adipocytes. The conversion of pregnenolone to androgens was analyzed by thin-layer chromatography. RESULTS Substantial amounts of testosterone in adipose tissue (25-153 ng/g tissue) and in the supernatant of adipocytes (0.33-0.69 ng/ten thousand cells]) were found. StAR and steroidogenic enzymes encoded by genes including Cyp11A1, Cyp17A1, Cyp19, Hsd3b2, Hsd17b3, and Srd5a2 were expressed in adipose tissue and cultured cells. Thin layer chromatography data revealed that preadipocytes and adipocytes were able to convert pregnenolone to testosterone. Higher levels for all steroidogenic enzymes were found in both depots of obese animals compared with lean animals, with significantly higher levels in inguinal tissue. CONCLUSIONS The whole steroidogenic machinery and capacity for testosterone biosynthesis were found in fat depots of female rats. These findings support the hypothesis that adipose tissue may contribute substantially to the hyperandrogenism in female obesity.
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Affiliation(s)
- Isabel Viola Wagner
- Pediatric Endocrinology Unit, Department of Women's and Children's Health, Karolinska Institute, Stockholm, Sweden
- Department of Pediatrics, Medical Faculty, University of Cologne, Cologne, Germany
- Integrated Research and Treatment Center (IFB Adiposity Diseases), University of Leipzig, Leipzig, Germany
| | - Lena Sahlin
- Pediatric Endocrinology Unit, Department of Women's and Children's Health, Karolinska Institute, Stockholm, Sweden
- Nordfertil Research Lab Stockholm, Stockholm, Sweden
| | - Iuliia Savchuk
- Pediatric Endocrinology Unit, Department of Women's and Children's Health, Karolinska Institute, Stockholm, Sweden
| | - Nora Klöting
- Integrated Research and Treatment Center (IFB Adiposity Diseases), University of Leipzig, Leipzig, Germany
| | - Konstantin Svechnikov
- Pediatric Endocrinology Unit, Department of Women's and Children's Health, Karolinska Institute, Stockholm, Sweden
| | - Olle Söder
- Pediatric Endocrinology Unit, Department of Women's and Children's Health, Karolinska Institute, Stockholm, Sweden
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Durmaz E, Erkekoglu P, Asci A, Akçurin S, Bircan İ, Kocer-Gumusel B. Urinary phthalate metabolite concentrations in girls with premature thelarche. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2018; 59:172-181. [PMID: 29625387 DOI: 10.1016/j.etap.2018.03.010] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Revised: 03/07/2018] [Accepted: 03/12/2018] [Indexed: 06/08/2023]
Abstract
In girls, breast development before eight years of age is called "premature thelarche (PT)". There are few studies in literature that show the interaction between PT and phthalate exposure. The aim of this study was to determine the urinary levels of di-(2-ethylhexyl) phthalate (DEHP) metabolites and other phthalate metabolites in girls with PT. PT group consisted of 29 newly diagnosed subjects. Control group comprised of healthy age-matched girls (n = 25). Urinary phthalate metabolite concentrations were measured by liquid chromatography/tandem mass spectroscopy (LC-MS/MS). The urinary concentrations of mono-(2-ethyl-hexyl)phthalate (MEHP) in the PT group (33.96 ± 6.88 μg/g creatinine) were found to be significantly higher compared to control group (11.54 ± 1.39 μg/g creatinine, p = 0.002). In PT group, %MEHP was also markedly higher vs. control (17.84 ± 3.31 vs. 6.44 ± 1.13, p = 0.001). Our results suggest that DEHP is more efficiently converted to MEHP in girls with PT, the importance of which needs to be further elucidated.
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Affiliation(s)
- Erdem Durmaz
- Akdeniz University, Faculty of Medicine, Department of Pediatric Endocrinology, Antalya, Turkey.
| | - Pinar Erkekoglu
- Hacettepe University, Faculty of Pharmacy, Department of Toxicology, Ankara, Turkey.
| | - Ali Asci
- Hacettepe University, Faculty of Pharmacy, Department of Toxicology, Ankara, Turkey; Atatürk University, Faculty of Pharmacy, Department of Toxicology, Erzurum, Turkey.
| | - Sema Akçurin
- Akdeniz University, Faculty of Medicine, Department of Pediatric Endocrinology, Antalya, Turkey.
| | - İffet Bircan
- Akdeniz University, Faculty of Medicine, Department of Pediatric Endocrinology, Antalya, Turkey.
| | - Belma Kocer-Gumusel
- Hacettepe University, Faculty of Pharmacy, Department of Toxicology, Ankara, Turkey.
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Svechnikov K, Savchuk I, Morvan ML, Antignac JP, Le Bizec B, Söder O. Phthalates Exert Multiple Effects on Leydig Cell Steroidogenesis. Horm Res Paediatr 2018; 86:253-263. [PMID: 26559938 DOI: 10.1159/000440619] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/05/2015] [Accepted: 08/21/2015] [Indexed: 11/19/2022] Open
Abstract
Humans are significantly exposed to phthalates via food packaging, cosmetics and medical devices such as tubings and catheters. Testicular Leydig cells (LCs) are suggested to be among the main targets of phthalate toxicity in the body. However, their sensitivity to phthalates is species-dependent. This paper describes the response of the LCs from different species (mouse, rat and human) to phthalate exposure in different experimental paradigms (in vivo, ex vivo and in vitro), with particular focus on mechanisms of phthalate action on LC steroidogenesis. A comprehensive analysis of the impact of phthalate diesters and phthalate monoesters on LCs in different stages of their development is presented and possible mechanisms of phthalates action are discussed. Finally novel, not yet fully elucidated sites of action of phthalate monoesters on the backdoor pathway of 5α-dihydrotestosterone biosynthesis in immature mouse LCs and their effects on steroidogenesis and redox state in adult mouse LCs are reported.
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Affiliation(s)
- Konstantin Svechnikov
- Department of Women's and Children's Health, Pediatric Endocrinology Unit, Karolinska Institute and University Hospital, Q2:08, Stockholm, Sweden
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Zhang Y, Li X, Gao J, Wang H. Influence of DEHP on thyroid, sex steroid-related genes and gonadal differentiation in Rana chensinensis tadpoles. ENVIRONMENTAL TOXICOLOGY 2018; 33:112-121. [PMID: 29098770 DOI: 10.1002/tox.22504] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2017] [Revised: 10/08/2017] [Accepted: 10/15/2017] [Indexed: 06/07/2023]
Abstract
In the present study, responses of the Chinese brown frog (Rana chensinensis) to exposure to di-2-ethylhexyl phthalate (DEHP), a common plasticizer, during the larval period were characterized. The effects of DEHP on metamorphosis rate, thyroid hormone, thyroid histology and the expression of genes involved in the steroid hormone synthesis in gonad were investigated. Metamorphosis rate and 50 percent of the tadpoles to reach Gosner stage 42 (T0.5 ) were significantly slower in all DEHP groups. The thyroid glands of the tadpoles exposed to DEHP clearly exhibited colloid depletion. In addition, decreased concentrations of T4 and T3 were observed in the tadpoles exposed to DEHP. Moreover, the highest DEHP exposure (10 µmol/L DEHP) showed increased ratio of females significantly. Also, up-regulation significantly of transcripts of cytochrome P450 aromatase (CYP19) gene was detected in male tadpoles exposed to DEHP. The present results indicate that this increase in estrogens could lead to female-biased sex ratio in DEHP exposure group. Taken together, the present study indicates that DEHP disrupt thyroid hormone and sex steroid signaling in R. chensinensis tadpoles. Our present observations support evidence of a crosstalk between TH and sex steroids in gonad differentiation.
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Affiliation(s)
- Yuhui Zhang
- College of Life Science, Shaanxi Normal University, Xi'an, 710119, China
| | - Xinyi Li
- College of Life Science, Shaanxi Normal University, Xi'an, 710119, China
| | - Jinshu Gao
- College of Life Science, Shaanxi Normal University, Xi'an, 710119, China
| | - Hongyuan Wang
- College of Life Science, Shaanxi Normal University, Xi'an, 710119, China
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Dekant W, Bridges J, Scialli AR. A quantitative weight of evidence assessment of confidence in modes-of-action and their human relevance. Regul Toxicol Pharmacol 2017; 90:51-71. [DOI: 10.1016/j.yrtph.2017.08.012] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Revised: 08/01/2017] [Accepted: 08/19/2017] [Indexed: 11/27/2022]
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Nepelska M, Odum J, Munn S. Adverse Outcome Pathway: Peroxisome Proliferator-Activated Receptor α Activation and Reproductive Toxicity—Development and Application in Assessment of Endocrine Disruptors/Reproductive Toxicants. ACTA ACUST UNITED AC 2017. [DOI: 10.1089/aivt.2017.0004] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Małgorzata Nepelska
- European Commission, Joint Research Centre (JRC), Directorate F–Health, Consumers and Reference Materials, Chemical Safety and Alternative Methods, Ispra, Italy
| | - Jenny Odum
- Regulatory Science Associates, Kip Marina, Inverkip, Renfrewshire, England
| | - Sharon Munn
- European Commission, Joint Research Centre (JRC), Directorate F–Health, Consumers and Reference Materials, Chemical Safety and Alternative Methods, Ispra, Italy
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Shen R, Zhao LL, Yu Z, Zhang C, Chen YH, Wang H, Zhang ZH, Xu DX. Maternal di-(2-ethylhexyl) phthalate exposure during pregnancy causes fetal growth restriction in a stage-specific but gender-independent manner. Reprod Toxicol 2017; 67:117-124. [DOI: 10.1016/j.reprotox.2016.12.003] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2016] [Revised: 11/13/2016] [Accepted: 12/06/2016] [Indexed: 11/28/2022]
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18
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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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Ha M, Guan X, Wei L, Li P, Yang M, Liu C. Di-(2-ethylhexyl) phthalate inhibits testosterone level through disturbed hypothalamic-pituitary-testis axis and ERK-mediated 5α-Reductase 2. THE SCIENCE OF THE TOTAL ENVIRONMENT 2016; 563-564:566-75. [PMID: 27155079 DOI: 10.1016/j.scitotenv.2016.04.145] [Citation(s) in RCA: 72] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/26/2016] [Revised: 04/19/2016] [Accepted: 04/20/2016] [Indexed: 05/28/2023]
Abstract
Di-(2-ethylhexyl) phthalate (DEHP) has reproductive toxicity and can affect male reproductive development. In order to clarify adverse effects of DEHP on testicular physiology and testosterone production, Sprague-Dawley (SD) rats were dosed daily with DEHP by gavage for 30days; TM3 cells (mouse Leydig cell line) were treated with DEHP for 24h after pretreatment with vitamin C or U0126. Results indicated that the hypothalamic-pituitary-testis (HPT) axis was disturbed and serum testosterone, LH and FSH levels were decreased following DEHP exposure. Histomorphological changes of rat testes were also observed, such as deformed seminiferous tubules, aggregated chromatin, multiple vacuoles, swollen mitochondria, apoptotic germ cells and Sertoli cells, as well as increased Leydig cell numbers. Moreover, DEHP caused oxidative stress in vivo and in vitro and then induced the ERK pathway, which was required to mediate 5α-Reductase 2 and scavenger receptor class B-1 (SRB1) levels. However, levels of steroidogenic acute regulatory protein (StAR), 3β-hydroxysteroid dehydrogenase (3β-HSD), 17β-hydroxysteroid dehydrogenase (17β-HSD), P450 17α-hydroxylase/17.20 lyase (P450c17), and P450 side-chain cleavage enzyme (P450scc) were not significantly altered after DEHP exposure. Taken together, DEHP-disturbed HPT axis and induced 5α-Reductase 2 contribute to the reduction of serum testosterone level. The activated ERK pathway is required to modulate expressions of 5α-Reductase 2 and SRB1.
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Affiliation(s)
- Mei Ha
- School of Nursing, Chongqing Medical and Pharmaceutical College, Chongqing 400020, PR China
| | - Xie Guan
- Key Lab of Birth Defects and Reproductive Health of National Health and Family Planning Commission, Chongqing Population and Family Planning Science and Technology Research Institute, Chongqing 400020, PR China
| | - Li Wei
- Key Lab of Birth Defects and Reproductive Health of National Health and Family Planning Commission, Chongqing Population and Family Planning Science and Technology Research Institute, Chongqing 400020, PR China
| | - Peng Li
- Chongqing General Hospital, Chongqing 400020, PR China
| | - Min Yang
- Key Lab of Birth Defects and Reproductive Health of National Health and Family Planning Commission, Chongqing Population and Family Planning Science and Technology Research Institute, Chongqing 400020, PR China
| | - Changjiang Liu
- Key Lab of Birth Defects and Reproductive Health of National Health and Family Planning Commission, Chongqing Population and Family Planning Science and Technology Research Institute, Chongqing 400020, PR China.
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20
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Zhu Y, Hua R, Zhou Y, Li H, Quan S, Yu Y. Chronic exposure to mono-(2-ethylhexyl)-phthalate causes endocrine disruption and reproductive dysfunction in zebrafish. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2016; 35:2117-2124. [PMID: 26762230 DOI: 10.1002/etc.3369] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/16/2015] [Revised: 12/12/2015] [Accepted: 01/10/2016] [Indexed: 06/05/2023]
Abstract
Phthalic acid esters are frequently detected in aquatic environments. In the present study, zebrafish were exposed to low concentrations (0 µg/L, 0.46 µg/L, 4.0 µg/L, and 37.5 µg/L) of mono-(2-ethylhexyl) phthalate (MEHP) for 81 d, and the effects on reproduction, gamete quality, plasma vitellogenin (VTG), sex steroids, and transcriptional profiles of key genes involved in steroidogenesis were investigated. The results demonstrated that egg production and sperm quality were decreased after exposure to MEHP, which also resulted in reduced egg diameter and eggshell as well as decreased egg protein content. Significant inductions in plasma testosterone and 17β-estradiol (E2) were observed in females, which might have resulted from up-regulation of CYP19a and 17β-HSD gene transcription in the ovary. A significant increase in plasma E2 along with a decrease in plasma 11-keto testosterone was also observed in males, which was accompanied by up-regulation of CYP19a and inhibition of CYP11b transcription in the testis. In addition, plasma vitellogenin levels were significantly increased after MEHP exposure in both sexes. Moreover, continuous MEHP exposure in the F1 embryos resulted in worse hatching rates and increased malformation rates compared with embryos without MEHP exposure. Taken together, these results demonstrate that MEHP has the potential to cause reproductive dysfunction and impair the development of offspring. However, it should be noted that most of the significant effects were observed at higher concentrations, and MEHP at typically measured concentrations may not have major effects on fish reproduction and development. Environ Toxicol Chem 2016;35:2117-2124. © 2016 SETAC.
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Affiliation(s)
- Yongtong Zhu
- Center for Reproductive Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Rui Hua
- Center for Reproductive Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yao Zhou
- Center for Reproductive Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Hong Li
- Center for Reproductive Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Song Quan
- Center for Reproductive Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, China
| | - Yanhong Yu
- Center for Reproductive Medicine, Nanfang Hospital, Southern Medical University, Guangzhou, China
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21
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Fournier K, Tebby C, Zeman F, Glorennec P, Zmirou-Navier D, Bonvallot N. Multiple exposures to indoor contaminants: Derivation of benchmark doses and relative potency factors based on male reprotoxic effects. Regul Toxicol Pharmacol 2016; 74:23-30. [DOI: 10.1016/j.yrtph.2015.11.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2015] [Revised: 11/23/2015] [Accepted: 11/24/2015] [Indexed: 12/19/2022]
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22
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Gomes J, Roche G. The Role of Estrogens and Estrogenic Metabolites and Male Reproductive Health Disorders. IMPLICATIONS AND CONSEQUENCES OF ANTHROPOGENIC POLLUTION IN POLAR ENVIRONMENTS 2016. [DOI: 10.1007/978-3-642-12315-3_8] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
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Jones S, Boisvert A, Francois S, Zhang L, Culty M. In utero exposure to di-(2-ethylhexyl) phthalate induces testicular effects in neonatal rats that are antagonized by genistein cotreatment. Biol Reprod 2015; 93:92. [PMID: 26316063 DOI: 10.1095/biolreprod.115.129098] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/11/2015] [Accepted: 08/24/2015] [Indexed: 12/11/2022] Open
Abstract
Fetal exposure to endocrine disruptors (EDs) is believed to predispose males to reproductive abnormalities. Although males are exposed to combinations of chemicals, few studies have evaluated the effects of ED mixtures at environmentally relevant doses. Our previous work showed that fetal exposure to a mixture of the phytoestrogen genistein (GEN) and the plasticizer di-(2-ethylhexyl) phthalate (DEHP) induced unique alterations in adult testis. In this follow-up study, we examined Postnatal Day 3 (PND3) and PND6 male offspring exposed from Gestational Day 14 to parturition to corn oil, 10mg/kg GEN, DEHP, or their combination, to gain insight into the early molecular events driving long-term alterations. DEHP stimulated the mRNA and protein expression of the steroidogenic enzyme HSD3B, uniquely at PND3. DEHP also increased the mRNA expression of Nestin, a Leydig progenitor/Sertoli cell marker, and markers of Sertoli cell (Wt1), gonocyte (Plzf, Foxo1), and proliferation (Pcna) at PND3, while these genes were unchanged by the mixture. Redox (Nqo1, Sod2, Sod3, Trx, Gst, Cat) and xenobiotic transporter (Abcb1b, Abcg2) gene expression was also increased by DEHP at PND3, while attenuated when combined with GEN, suggesting the involvement of cellular stress in short-term DEHP effects and a protective effect of GEN. The direct effects of GEN and mono-(2-ethylhexyl) phthalate, the principal bioactive metabolite of DEHP, on testis were investigated in PND3 organ cultures, showing a stimulatory effect of 10 μM mono-(2-ethylhexyl) phthalate on basal testosterone production that was normalized by GEN. These effects contrasted with previous reports of androgen suppression and decreased gene expression in perinatal rat testis by high DEHP doses, implying that neonatal effects are not predictive of adult effects. We propose that GEN, through an antioxidant action, normalizes reactive oxygen species-induced neonatal effects of DEHP. The notion that these EDs do not follow classical dose-response effects and involve different mechanisms of toxicity from perinatal ages to adulthood highlights the importance of assessing impacts across a range of doses and ages.
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Affiliation(s)
- Steven Jones
- Division of Experimental Medicine, The Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, Canada
| | - Annie Boisvert
- Department of Medicine, The Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, Canada
| | - Sade Francois
- Department of Pharmacology & Therapeutics, The Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, Canada
| | - Liandong Zhang
- Department of Urology, The Second Affiliated Hospital, School of Medicine, Xi'an Jiaotong University, Xi'an, Shaanxi, China
| | - Martine Culty
- Division of Experimental Medicine, The Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, Canada Department of Medicine, The Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, Canada Department of Pharmacology & Therapeutics, The Research Institute of the McGill University Health Centre, McGill University, Montreal, Quebec, Canada
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24
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Prenatal Exposure to DEHP Affects Spermatogenesis and Sperm DNA Methylation in a Strain-Dependent Manner. PLoS One 2015; 10:e0132136. [PMID: 26244509 PMCID: PMC4526524 DOI: 10.1371/journal.pone.0132136] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2015] [Accepted: 06/10/2015] [Indexed: 12/03/2022] Open
Abstract
Di-(2-ethylhexyl)phtalate (DEHP) is a plasticizer with endocrine disrupting properties found ubiquitously in the environment and altering reproduction in rodents. Here we investigated the impact of prenatal exposure to DEHP on spermatogenesis and DNA sperm methylation in two distinct, selected, and sequenced mice strains. FVB/N and C57BL/6J mice were orally exposed to 300 mg/kg/day of DEHP from gestation day 9 to 19. Prenatal DEHP exposure significantly decreased spermatogenesis in C57BL/6J (fold-change = 0.6, p-value = 8.7*10-4), but not in FVB/N (fold-change = 1, p-value = 0.9). The number of differentially methylated regions (DMRs) by DEHP-exposure across the entire genome showed increased hyper- and decreased hypo-methylation in C57BL/6J compared to FVB/N. At the promoter level, three important subsets of genes were massively affected. Promoters of vomeronasal and olfactory receptors coding genes globally followed the same trend, more pronounced in the C57BL/6J strain, of being hyper-methylated in DEHP related conditions. In contrast, a large set of micro-RNAs were hypo-methylated, with a trend more pronounced in the FVB/N strain. We additionally analyze both the presence of functional genetic variations within genes that were associated with the detected DMRs and that could be involved in spermatogenesis, and DMRs related with the DEHP exposure that affected both strains in an opposite manner. The major finding in this study indicates that prenatal exposure to DEHP can decrease spermatogenesis in a strain-dependent manner and affects sperm DNA methylation in promoters of large sets of genes putatively involved in both sperm chemotaxis and post-transcriptional regulatory mechanisms.
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Xie C, Zhao Y, Gao L, Chen J, Cai D, Zhang Y. Elevated phthalates' exposure in children with constitutional delay of growth and puberty. Mol Cell Endocrinol 2015; 407:67-73. [PMID: 25770461 DOI: 10.1016/j.mce.2015.03.006] [Citation(s) in RCA: 34] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/04/2014] [Revised: 02/12/2015] [Accepted: 03/06/2015] [Indexed: 11/22/2022]
Abstract
BACKGROUND Phthalates have been proven to be antiandrogenic, which may interfere with the timing of puberty. Children with Constitutional Delay of Growth and Puberty (CDGP) typically display short stature and pubertal delay. This study investigated whether phthalate's exposure was associated with CDGP, and evaluated the potential mediator role of testosterone. METHODS In this case-control study, a total of 167 boys, including 57 boys with CDGP (cases) and 110 controls were enrolled. We measured six major phthalate metabolites in urine samples using high-performance liquid chromatography and tandem mass spectrometry (LC-MS/MS). The serum testosterone level was determined by radioimmunoassay. RESULTS Children in the CDGP group were determined to have significantly elevated urinary phthalates concentration compared with control subjects (total phthalates median: case, 107.00 ng/ml; control, 62.22 ng/ml, p = 0.001). After adjustment for BMI and other confounding factors: mono-n-butyl phthalate (MBP), monoethyl phthalate (MEP) and total phthalate concentrations were significantly negatively associated with serum testosterone level (MBP: β = -45.7, p = 0.017; MEP: β = -31.6, p = 0.022; total phthalates: β = -24.6, p = 0.011); MBP, MEP, mono (2-ethylhexyl) phthalate (MEHP) and total phthalates were significantly associated with CDGP (odds ratio: MBP: 8.30, p = 0.002; MEP: 5.43, p = 0.002; MEHP: 3.83, p = 0.017; total phthalates: 9.09, p = 0.001). Serum testosterone level acted as a mediator of the association between phthalates' exposure and CDGP (p = 0.002) (proportion mediated: 34.4%). CONCLUSIONS In this case-control study, elevated phthalates' level was detected in children with CDGP in Shanghai, China and phthalate level was associated with CDGP, which appeared to be mediated by circulating testosterone level.
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Affiliation(s)
- Changming Xie
- Key Laboratory of Public Health Safety, Ministry of Education, School of Public Health, Fudan University, Shanghai, China
| | - Yan Zhao
- Key Laboratory of Public Health Safety, Ministry of Education, School of Public Health, Fudan University, Shanghai, China
| | - Lianlian Gao
- Children's Hospital of Fudan University, Shanghai, China
| | - Jiao Chen
- Key Laboratory of Public Health Safety, Ministry of Education, School of Public Health, Fudan University, Shanghai, China
| | - Depei Cai
- Children's Hospital of Fudan University, Shanghai, China
| | - Yunhui Zhang
- Key Laboratory of Public Health Safety, Ministry of Education, School of Public Health, Fudan University, Shanghai, China.
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Sekaran S, Jagadeesan A. In Utero Exposure to Phthalate Downregulates Critical Genes in Leydig Cells of F1Male Progeny. J Cell Biochem 2015; 116:1466-77. [DOI: 10.1002/jcb.25108] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2014] [Accepted: 01/23/2015] [Indexed: 11/09/2022]
Affiliation(s)
- Suganya Sekaran
- Department of Endocrinology; Dr. ALM Post-Graduate Institute of Basic Medical Sciences; University of Madras; Chennai 600113 India
| | - Arunakaran Jagadeesan
- Department of Endocrinology; Dr. ALM Post-Graduate Institute of Basic Medical Sciences; University of Madras; Chennai 600113 India
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Rosenfeld CS. Bisphenol A and phthalate endocrine disruption of parental and social behaviors. Front Neurosci 2015; 9:57. [PMID: 25784850 PMCID: PMC4347611 DOI: 10.3389/fnins.2015.00057] [Citation(s) in RCA: 66] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/21/2014] [Accepted: 02/09/2015] [Indexed: 11/24/2022] Open
Abstract
Perinatal exposure to endocrine disrupting chemicals (EDCs) can induce promiscuous neurobehavioral disturbances. Bisphenol A and phthalates are two widely prevalent and persistent EDCs reported to lead to such effects. Parental and social behaviors are especially vulnerable to endocrine disruption, as these traits are programmed by the organizational-activational effects of testosterone and estrogen. Exposure to BPA and other EDCs disrupts normal maternal care provided by rodents and non-human primates, such as nursing, time she spends hunched over and in the nest, and grooming her pups. Paternal care may also be affected by BPA. No long-term study has linked perinatal exposure to BPA or other EDC and later parental behavioral deficits in humans. The fact that the same brain regions and neural hormone substrates govern parental behaviors in animal models and humans suggests that this suite of behaviors may also be vulnerable in the latter. Social behaviors, such as communication, mate choice, pair bonding, social inquisitiveness and recognition, play behavior, social grooming, copulation, and aggression, are compromised in animal models exposed to BPA, phthalates, and other EDCs. Early contact to these chemicals is also correlated with maladaptive social behaviors in children. These behavioral disturbances may originate by altering the fetal or adult gonadal production of testosterone or estrogen, expression of ESR1, ESR2, and AR in the brain regions governing these behaviors, neuropeptide/protein hormone (oxytocin, vasopressin, and prolactin) and their cognate neural receptors, and/or through epimutations. Robust evidence exists for all of these EDC-induced changes. Concern also exists for transgenerational persistence of such neurobehavioral disruptions. In sum, evidence for social and parental deficits induced by BPA, phthalates, and related chemicals is strongly mounting, and such effects may ultimately compromise the overall social fitness of populations to come.
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Affiliation(s)
- Cheryl S Rosenfeld
- Bond Life Sciences Center, Genetics Area Program, Biomedical Sciences, University of Missouri Columbia, MO, USA
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Savchuk I, Söder O, Svechnikov K. Mono-2-ethylhexyl phthalate stimulates androgen production but suppresses mitochondrial function in mouse leydig cells with different steroidogenic potential. Toxicol Sci 2015; 145:149-56. [PMID: 25677926 DOI: 10.1093/toxsci/kfv042] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
Numerous studies have reported on testicular toxicity of phthalates in different experimental paradigms and showed that Leydig cells (LCs) were one of the main targets of phthalate actions. Adverse effects of phthalates on LCs steroidogenesis have been attributed to their metabolites, monophthalates. This study focuses on investigation whether LCs responsiveness to monophthalates action is associated with their potential to produce androgens. We found that of 3 monophthalates investigated [ie, mono-2-ethylhexyl phthalate (MEHP), mono-n-butyl phthalate, and mono-n-benzyl phthalate] only MEHP caused biological effects on the mouse LCs function. This monophthalate stimulated basal steroidogenesis associated with upregulation of StAR protein expression with no effect on hCG-stimulated androgen production by LCs from CBA/Lac and C57BL/6j mouse genotypes were observed. Further, MEHP attenuated ATP production and increased superoxide generation by both phenotypes of mouse LCs that indicated on mitochondrial dysfunction induced by the monophthalate. All together, our data indicate that MEHP-mediated stimulation of steroidogenesis and perturbation in mitochondrial function are not associated with the capacity of the LCs to synthesize androgens. We suggest that this effect of MEHP observed in LCs of rodent origin needs to be taken into consideration in analysis of earlier start of puberty in boys and may highlight a possible influence of phthalates on reproductive health in males.
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Affiliation(s)
- Iuliia Savchuk
- Department of Woman and Child Health, Pediatric Endocrinology Unit Q2:08, Karolinska Institute and University Hospital, Astrid Lindgren Children's Hospital, SE-17176 Stockholm, Sweden
| | - Olle Söder
- Department of Woman and Child Health, Pediatric Endocrinology Unit Q2:08, Karolinska Institute and University Hospital, Astrid Lindgren Children's Hospital, SE-17176 Stockholm, Sweden
| | - Konstantin Svechnikov
- Department of Woman and Child Health, Pediatric Endocrinology Unit Q2:08, Karolinska Institute and University Hospital, Astrid Lindgren Children's Hospital, SE-17176 Stockholm, Sweden
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29
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Albert O, Jégou B. A critical assessment of the endocrine susceptibility of the human testis to phthalates from fetal life to adulthood. Hum Reprod Update 2013; 20:231-49. [DOI: 10.1093/humupd/dmt050] [Citation(s) in RCA: 106] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Martinez-Arguelles DB, Campioli E, Culty M, Zirkin BR, Papadopoulos V. Fetal origin of endocrine dysfunction in the adult: the phthalate model. J Steroid Biochem Mol Biol 2013; 137:5-17. [PMID: 23333934 DOI: 10.1016/j.jsbmb.2013.01.007] [Citation(s) in RCA: 97] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/22/2012] [Revised: 12/27/2012] [Accepted: 01/07/2013] [Indexed: 11/16/2022]
Abstract
Di-(2-ethylhexyl) phthalate (DEHP) is a plasticizer with endocrine disrupting properties that is found ubiquitously in the environment as well as in human amniotic fluid, umbilical cord blood, human milk, semen, and saliva. It is used in the industry to add flexibility to polyvinyl chloride-derived plastics and its wide spread use and presence has resulted in constant human exposure through fetal development and postnatal life. Epidemiological studies have suggested an association between phthalate exposures and human reproductive effects in infant and adult populations. The effects of fetal exposure to phthalates on the male reproductive system were unequivocally shown on animal models, principally rodents, in which short term deleterious reproductive effects are well established. By contrast, information on the long term effects of DEHP in utero exposure on gonadal function are scarce, while its potential effects on other organs are just starting to emerge. The present review focuses on these novel findings, which suggest that DEHP exerts more complex and broader disruptive effects on the endocrine system and metabolism than previously thought. This article is part of a Special Issue entitled "CSR 2013".
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Affiliation(s)
- D B Martinez-Arguelles
- The Research Institute of the McGill University Health Centre and Department of Medicine, McGill University, Montreal, Quebec, Canada
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Zhou L, Beattie MC, Lin CY, Liu J, Traore K, Papadopoulos V, Zirkin BR, Chen H. Oxidative stress and phthalate-induced down-regulation of steroidogenesis in MA-10 Leydig cells. Reprod Toxicol 2013; 42:95-101. [PMID: 23969005 DOI: 10.1016/j.reprotox.2013.07.025] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2012] [Revised: 07/15/2013] [Accepted: 07/31/2013] [Indexed: 02/02/2023]
Abstract
Previous studies have shown that phthalate exposure can suppress steroidogenesis. However, the affected components of the steroidogenic pathway, and the mechanisms involved, remain uncertain. We show that incubating MA-10 Leydig cells with mono-(2-ethylhexyl) phthalate (MEHP) resulted in reductions in luteinizing hormone (LH)-stimulated cAMP and progesterone productions. cAMP did not decrease in response to MEHP when the cells were incubated with cholera toxin or forskolin. Incubation of MEHP-treated cells with dibutyryl-cAMP, 22-hydroxycholesterol or pregnenolone inhibited the reductions in progesterone. Increased levels of reactive oxygen species (ROS) occurred in response to MEHP. In cells in which intracellular glutathione was depleted by buthionine sulfoximine pretreatment, the increases in ROS and decreases in progesterone in response to MEHP treatment were exacerbated. These results indicate that MEHP inhibits MA-10 Leydig cell steroidogenesis by targeting LH-stimulated cAMP production and cholesterol transport, and that a likely mechanism by which MEHP acts is through increased oxidative stress.
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Affiliation(s)
- Liang Zhou
- Department of Biochemistry and Molecular Biology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD 21205, United States
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Li N, Liu T, Zhou L, He J, Ye L. Di-(2-ethylhcxyl) phthalate reduces progesterone levels and induces apoptosis of ovarian granulosa cell in adult female ICR mice. ENVIRONMENTAL TOXICOLOGY AND PHARMACOLOGY 2012; 34:869-75. [PMID: 22986106 DOI: 10.1016/j.etap.2012.08.013] [Citation(s) in RCA: 38] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2011] [Accepted: 08/24/2012] [Indexed: 05/05/2023]
Abstract
Di-(2-ethylhexyl) phthalate (DEHP) as an environmental endocrine disruptor is a known reproductive toxicant and carcinogen. The purpose of this study was to evaluate the female reproductive toxicity of DEHP. Sixty ICR female mice were randomized into four groups dosed with 0, 125, 500, or 2 000 mg/kg DEHP by gavage for 16 weeks, 6 days/week. DEHP treatment prolonged duration of the estrous cycle in mice at 500 and 2000 mg/kg DEHP, but no significant effects on estrus phase of the cycle in each group were detected. Exposure to DEHP inhibited secretion of serum progesterone. DEHP arrested granulosa cells at G(0)/G(1) phases and increased proportion of apoptosis cells at 500 and 2000 mg/kg DEHP. There was no significant difference in P450arom mRNA expression among groups. Results demonstrate that DEHP can produce toxicity in female reproductive system.
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Affiliation(s)
- Na Li
- Department of Occupational and Environmental Health, School of Public Health, Jilin University, Changchun, Jilin 130021, China
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Piché CD, Sauvageau D, Vanlian M, Erythropel HC, Robaire B, Leask RL. Effects of di-(2-ethylhexyl) phthalate and four of its metabolites on steroidogenesis in MA-10 cells. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2012; 79:108-115. [PMID: 22236953 DOI: 10.1016/j.ecoenv.2011.12.008] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2011] [Revised: 12/09/2011] [Accepted: 12/13/2011] [Indexed: 05/31/2023]
Abstract
Phthalate plasticizers are used in the plastics industry to aid in processing and impart flexibility to plastics. Due to the broad use of plastics, and the tendency of plasticizers to leach out of polymers, plasticizers have become ubiquitous in the environment. Concerns about the testicular toxicity of phthalate plasticizers, in particular di-(2-ethylhexyl) phthalate (DEHP), have arisen due to their ability to cause male reproductive tract abnormalities in animal models. It has been assumed that the DEHP metabolite, mono-(2-ethylhexyl) phthalate (MEHP), is the active compound, however, metabolites such as 2-ethylhexanol, 2-ethylhexanal and 2-ethylhexanoic acid, have not been thoroughly investigated. The aim of this study was to evaluate the anti-androgenic potential of these metabolites in vitro with a mouse Leydig tumor cell line, MA-10 cells. DEHP, MEHP and 2-ethylhexanal were found to decrease cell viability, as well as steroidogenic potential. The latter was assessed using an enzyme-linked immunosorbent assay (ELISA) to quantify steroid production and quantitative real-time polymerase chain reaction (qRT-PCR) to assess gene expression analysis of key steroidogenic enzymes. 2-Ethylhexanal proved to be the most potent steroidogenic disruptor, offering intriguing implications in the search for the mechanism of phthalate testicular toxicity. Overall, the study suggests the involvement of multiple active metabolites in the testicular toxicity of DEHP.
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Affiliation(s)
- Carlie D Piché
- Department of Chemical Engineering, McGill University, 3610 University Street, Montréal, QC, Canada H3A 2B2
| | - Dominic Sauvageau
- Department of Chemical Engineering, McGill University, 3610 University Street, Montréal, QC, Canada H3A 2B2; Department of Chemical and Materials Engineering, University of Alberta, 9107 116 Sreet, Edmonton, AB, Canada T6G 2V4
| | - Marie Vanlian
- Department of Chemical Engineering, McGill University, 3610 University Street, Montréal, QC, Canada H3A 2B2
| | - Hanno C Erythropel
- Department of Chemical Engineering, McGill University, 3610 University Street, Montréal, QC, Canada H3A 2B2
| | - Bernard Robaire
- Department of Pharmacology and Therapeutics, McGill University, 3655 Promenade Sir-William-Osler, Montréal, QC, Canada H3G 1Y6
| | - Richard L Leask
- Department of Chemical Engineering, McGill University, 3610 University Street, Montréal, QC, Canada H3A 2B2.
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Krotz SP, Carson SA, Tomey C, Buster JE. Phthalates and bisphenol do not accumulate in human follicular fluid. J Assist Reprod Genet 2012; 29:773-7. [PMID: 22538552 DOI: 10.1007/s10815-012-9775-1] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2012] [Accepted: 04/10/2012] [Indexed: 01/29/2023] Open
Abstract
OBJECTIVE To determine if phthalates and bisphenol A accumulate in human follicular fluid after brief exposure to medical plastics during an IVF cycle STUDY DESIGN Prospective collection of follicular fluid from five infertile women undergoing oocyte retrieval at a University IVF laboratory and analysis of Phthalate & Bisphenol A levels. RESULTS All phthalate levels were detected at levels less than 15 ng/mL and Bisphenol A levels were undetectable in all five samples. The concentrations of phthalates are 200-1000 fold less than the minimum levels reported to cause reproductive toxicity in vitro to cumulus-oocyte complexes of laboratory animals. CONCLUSIONS In reproductive age women undergoing infertility treatments there is little transfer or accumulation of phthalates, phthalate metabolites or bisphenol A into the microenvironment of the human preovulatory oocyte and the levels are not clinically significant. Further investigation of phthalate and bisphenol A accumulation in vivo in human follicular fluid may not be productive.
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Chauvigné F, Plummer S, Lesné L, Cravedi JP, Dejucq-Rainsford N, Fostier A, Jégou B. Mono-(2-ethylhexyl) phthalate directly alters the expression of Leydig cell genes and CYP17 lyase activity in cultured rat fetal testis. PLoS One 2011; 6:e27172. [PMID: 22087261 PMCID: PMC3210143 DOI: 10.1371/journal.pone.0027172] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2011] [Accepted: 10/11/2011] [Indexed: 11/18/2022] Open
Abstract
Exposure to phthalates in utero alters fetal rat testis gene expression and testosterone production, but much remains to be done to understand the mechanisms underlying the direct action of phthalate within the fetal testis. We aimed to investigate the direct mechanisms of action of mono-(2-ethylhexyl) phthalate (MEHP) on the rat fetal testis, focusing on Leydig cell steroidogenesis in particular. We used an in vitro system based on the culture for three days, with or without MEHP, of rat fetal testes obtained at 14.5 days post-coitum.Exposure to MEHP led to a dose-dependent decrease in testosterone production. Moreover, the production of 5 alpha-dihydrotestosterone (5α-DHT) (-68%) and androstenedione (-54%) was also inhibited by 10 µM MEHP, whereas 17 alpha-hydroxyprogesterone (17α-OHP) production was found to increase (+41%). Testosterone synthesis was rescued by the addition of androstenedione but not by any of the other precursors used. Thus, the hormone data suggested that steroidogenesis was blocked at the level of the 17,20 lyase activity of the P450c17 enzyme (CYP17), converting 17α-OHP to androstenedione. The subsequent gene expression and protein levels supported this hypothesis. In addition to Cyp17a1, microarray analysis showed that several other genes important for testes development were affected by MEHP. These genes included those encoding insulin-like factor 3 (INSL3), which is involved in controlling testicular descent, and Inha, which encodes the alpha subunit of inhibin B.These findings indicate that under in vitro conditions known to support normal differentiation of the fetal rat testis, the exposure to MEHP directly inhibits several important Leydig cell factors involved in testis function and that the Cyp17a1 gene is a specific target to MEHP explaining the MEHP-induced suppression of steroidogenesis observed.
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Affiliation(s)
- François Chauvigné
- Inserm (Institut National de la Santé et de la Recherche Médicale), U625, IRSET (Institut de Recherche sur la Santé, l'Environnement et le Travail), Rennes, France
| | | | - Laurianne Lesné
- Inserm (Institut National de la Santé et de la Recherche Médicale), U625, IRSET (Institut de Recherche sur la Santé, l'Environnement et le Travail), Rennes, France
| | | | - Nathalie Dejucq-Rainsford
- Inserm (Institut National de la Santé et de la Recherche Médicale), U625, IRSET (Institut de Recherche sur la Santé, l'Environnement et le Travail), Rennes, France
| | - Alexis Fostier
- INRA (Institut National de la Recherche Agronomique), UR1037 SCRIBE (Station Commune de Recherche en Ichtyophysiologie, Biodiversité et Environnement), Rennes, France
| | - Bernard Jégou
- Inserm (Institut National de la Santé et de la Recherche Médicale), U625, IRSET (Institut de Recherche sur la Santé, l'Environnement et le Travail), Rennes, France
- * E-mail:
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Pathirana IN, Kawate N, Tsuji M, Takahashi M, Hatoya S, Inaba T, Tamada H. In vitro effects of estradiol-17β, monobutyl phthalate and mono-(2-ethylhexyl) phthalate on the secretion of testosterone and insulin-like peptide 3 by interstitial cells of scrotal and retained testes in dogs. Theriogenology 2011; 76:1227-33. [PMID: 21752447 DOI: 10.1016/j.theriogenology.2011.05.027] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2011] [Revised: 05/14/2011] [Accepted: 05/14/2011] [Indexed: 11/29/2022]
Abstract
The objective was to determine the effects of estradiol-17β, monobutyl phthalate (MBP) and mono-(2-ethylhexyl) phthalate (MEHP) on testosterone and insulin-like peptide 3 (INSL3) secretions in cultured testicular interstitial cells isolated (enzymatic dispersion) from scrotal and retained testes of small-breed dogs. Suspension cultures were treated with estradiol-17β (0, 10, and 100 ng/mL), MBP (0, 0.8, and 8 mmol/L) or MEHP (0, 0.2, and 0.8 mmol/L) for 18 h, in the presence or absence of 0.1 IU/mL hCG. Testosterone (both basal and hCG-induced) and INSL3 (basal) concentrations were measured in spent medium. Effects of estradiol-17β, MBP, and MEHP on testosterone and INSL3 secretions were not affected (P > 0.15) by cell source (scrotal versus retained testis); therefore, data were combined and analyzed, and outcomes reported as percentage relative to the control. In testicular interstitial cells, basal testosterone secretion was increased (P < 0.01) by 100 ng/mL estradiol-17β (130.2 ± 10.6% of control). Among phthalates, 0.2 and 0.8 mmol/L MEHP stimulated (P < 0.01) basal testosterone secretion (135.5 ± 8.3% and 154.6 ± 12.9%, respectively). However, hCG-induced testosterone secretion was inhibited (P < 0.01) by 8 mmol/L MBP (67.7 ± 6.0%), and tended to be inhibited (P = 0.056) by 0.8 mmol/L MEHP (84.5 ± 5.6%). Basal INSL3 secretion was inhibited (P < 0.01) by 8 mmol/L MBP (73.6 ± 6.8%) and 0.8 mmol/L MEHP (76.9 ± 11.3%). In conclusion, we inferred that estradiol-17β and certain phthalate monoesters had direct effects on secretions of testosterone and INSL3 in canine testicular interstitial cells, with no significant difference between scrotal and retained testes.
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Affiliation(s)
- I N Pathirana
- Department of Advanced Pathobiology, Graduate School of Life and Environmental Sciences, Osaka Prefecture University, Izumisano, Osaka, Japan
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Svechnikova K, Svechnikova I, Söder O. Gender-Specific Adverse Effects of Mono-Ethylhexyl Phthalate on Steroidogenesis in Immature Granulosa Cells and Rat Leydig cell Progenitors in vitro. Front Endocrinol (Lausanne) 2011; 2:9. [PMID: 22649361 PMCID: PMC3355864 DOI: 10.3389/fendo.2011.00009] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/18/2011] [Accepted: 04/07/2011] [Indexed: 11/30/2022] Open
Abstract
Di-(2-ethylhexyl) phthalate, one of the phthalates most widely distributed in the environment, causes reproductive toxicity that is attributable to the action of its primary metabolite, mono-(2-ethylhexyl) phthalate (MEHP). Here, we have investigated the effects of MEHP on steroidogenesis by primary cultures of rat Leydig cell progenitors and immature granulosa cells. This phthalate stimulated basal steroidogenesis and steroidogenic acute regulatory protein (StAR) expression in both types of steroidogenic cells. However, when MEHP was incubated with (Bu)(2)cAMP, steroid production was increased in granulosa cells and suppressed in Leydig cell progenitors, a process associated with up-regulation of StAR expression. Our data suggest that MEHP exerts gender-specific adverse effects on the hormonal function of the developing gonads. This may be involved in the development of pathological conditions including disorders of prenatal sex development that may attenuate future reproductive health.
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Affiliation(s)
- Konstantin Svechnikova
- Department of Woman and Child Health, Pediatric Endocrinology Unit, Karolinska Institute and University HospitalStockholm, Sweden
- *Correspondence: Konstantin Svechnikov, Department of Woman and Child Health, Pediatric Endocrinology Unit, Q2:08, Karolinska Institute and Hospital, Astrid Lindgren Children's Hospital, S-17176 Stockholm, Sweden. e-mail:
| | - Irina Svechnikova
- Department of Woman and Child Health, Pediatric Endocrinology Unit, Karolinska Institute and University HospitalStockholm, Sweden
| | - Olle Söder
- Department of Woman and Child Health, Pediatric Endocrinology Unit, Karolinska Institute and University HospitalStockholm, Sweden
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Endocrine disruptors and Leydig cell function. J Biomed Biotechnol 2010; 2010. [PMID: 20862379 PMCID: PMC2938463 DOI: 10.1155/2010/684504] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2009] [Revised: 05/23/2010] [Accepted: 06/23/2010] [Indexed: 01/18/2023] Open
Abstract
During the past decades, a large body of information concerning the effects of endocrine disrupting compounds (EDCs) on animals and humans has been accumulated. EDCs are of synthetic or natural origin and certain groups are known to disrupt the action of androgens and to impair the development of the male reproductive tract and external genitalia. The present overview describes the effects of the different classes of EDCs, such as pesticides, phthalates, dioxins, and phytoestrogens, including newly synthesized resveratrol analogs on steroidogenesis in Leydig cells. The potential impact of these compounds on androgen production by Leydig cells during fetal development and in the adult age is discussed. In addition, the possible role of EDCs in connection with the increasing frequency of abnormalities in reproductive development in animals and humans is discussed.
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Effect of mono-(2-ethylhexyl) phthalate on steroid production of human granulosa cells. Toxicol Appl Pharmacol 2009; 239:116-23. [DOI: 10.1016/j.taap.2009.05.022] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2009] [Revised: 05/15/2009] [Accepted: 05/26/2009] [Indexed: 11/19/2022]
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Lucas B, Fields C, Hofmann MC. Signaling pathways in spermatogonial stem cells and their disruption by toxicants. ACTA ACUST UNITED AC 2009; 87:35-42. [PMID: 19306349 DOI: 10.1002/bdrc.20145] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Spermatogenesis is a complex biological process that is particularly sensitive to environmental insults such as chemicals and physical stressors. Exposure to specific chemicals has been shown to inhibit fertility through a negative impact on germ cell proliferation and differentiation that can lower sperm count. In addition, toxicants might produce DNA damages that could have negative consequences on the development of the offspring. This review describes spermatogonial stem cell development in the testis, signaling pathways that are crucial for self-renewal, and possible target molecules for environmental toxicants such as phthalate esters and nanoparticles.
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Affiliation(s)
- Benjamin Lucas
- Institute for Genomic Biology, Department of Veterinary Biosciences, College of Veterinary Medicine, University of Illinois at Urbana-Champaign, Urbana, Illinois 61822, USA.
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