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Mogus JP, Matouskova K, Clark ZW, Jerry DJ, Vandenberg LN. Effects of butyl benzyl phthalate exposure during pregnancy and lactation on the post-involution mammary gland. Reprod Toxicol 2023; 122:108470. [PMID: 37743007 DOI: 10.1016/j.reprotox.2023.108470] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2023] [Revised: 08/17/2023] [Accepted: 09/04/2023] [Indexed: 09/26/2023]
Abstract
The mammary gland undergoes comprehensive reorganization during pregnancy, lactation, and subsequent involution. Following involution, the mammary gland has structural and functional differences compared to the gland of a nulliparous female. These parity-associated changes are regulated by hormones and may be vulnerable to endocrine-disrupting chemicals (EDCs). In this study, we evaluated the long-term effects of butyl benzyl phthalate (BBP), an estrogenic plasticizer, on the parous mouse mammary gland. Pregnant BALB/c mice were treated with 0, 3, 500, or 18000 µg/kg/day BBP throughout both pregnancy and the lactational period. The litters born to these females were evaluated for litter size and growth. The parous females were then kept for five weeks following weaning of the pups, during which period there was no exposure to BBP. After five weeks of post-weaning, mammary glands were collected and assessed for changes in histomorphology, steroid receptor expression, innate immune cell number, and gene expression. An unexposed age-matched nulliparous control was also evaluated as a comparator group. BBP increased male and female pup weight at puberty and female offspring in adulthood. BBP also altered innate immune cells in the post-involution mammary gland, reducing the effect of parity on macrophages. Lastly, BBP modestly increased mammary gland ductal complexity and periductal structure, but had no effect on expression of estrogen receptor, progesterone receptor, or a marker of proliferation. These results suggest that BBP may interfere with some effects of parity on the mouse mammary gland and induce weight gain in exposed offspring.
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Affiliation(s)
- Joshua P Mogus
- Department of Environmental Health Sciences, School of Public Health & Health Sciences, University of Massachusetts, Amherst, MA, USA
| | - Klara Matouskova
- Department of Environmental Health Sciences, School of Public Health & Health Sciences, University of Massachusetts, Amherst, MA, USA
| | - Zachary W Clark
- Department of Environmental Health Sciences, School of Public Health & Health Sciences, University of Massachusetts, Amherst, MA, USA
| | - D Joseph Jerry
- Department of Veterinary & Animal Sciences, University of Massachusetts, Amherst, MA, USA; Pioneer Valley Life Sciences Institute, Springfield, MA, USA
| | - Laura N Vandenberg
- Department of Environmental Health Sciences, School of Public Health & Health Sciences, University of Massachusetts, Amherst, MA, USA.
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Kim CE, Binder AM, Corvalan C, Pereira A, Shepherd J, Calafat AM, Botelho JC, Hampton JM, Trentham-Dietz A, Michels KB. Time-specific impact of mono-benzyl phthalate (MBzP) and perfluorooctanoic acid (PFOA) on breast density of a Chilean adolescent Cohort. ENVIRONMENT INTERNATIONAL 2023; 181:108241. [PMID: 37857187 DOI: 10.1016/j.envint.2023.108241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/05/2023] [Revised: 09/13/2023] [Accepted: 09/27/2023] [Indexed: 10/21/2023]
Abstract
INTRODUCTION High mammographic density is among the strongest and most established predictors for breast cancer risk. Puberty, the period during which breasts undergo exponential mammary growth, is considered one of the critical stages of breast development for environmental exposures. Benzylbutyl phthalate (BBP) and perfluorooctanoic acid (PFOA) are pervasive endocrine disrupting chemicals that may increase hormone-sensitive cancers. Evaluating the potential impact of BBP and PFOA exposure on pubertal breast density is important to our understanding of early-life environmental influences on breast cancer etiology. OBJECTIVE To prospectively assess the effect of biomarker concentrations of monobenzyl phthalate (MBzP) and PFOA at specific pubertal window of susceptibility (WOS) on adolescent breast density. METHOD This study included 376 Chilean girls from the Growth and Obesity Cohort Study with data collection at four timepoints: Tanner breast stages 1 (B1) and 4 (B4), 1- year post- menarche (1YPM) and 2-years post-menarche (2YPM). Dual-energy X-ray absorptiometry was used to assess the absolute fibroglandular volume (FGV) and percent breast density (%FGV) at 2YPM. We used concentrations of PFOA in serum and MBzP in urine as an index of exposure to PFOA and BBP, respectively. Parametric G-formula was used to estimate the time-specific effects of MBzP and PFOA on breast density. The models included body fat percentage as a time-varying confounder and age, birthweight, age at menarche, and maternal education as fixed covariates. RESULTS A doubling of serum PFOA concentration at B4 resulted in a non-significant increase in absolute FGV (β:11.25, 95% confidence interval (CI): -0.28, 23.49)), while a doubling of PFOA concentration at 1YPM resulted in a decrease in % FGV (β:-4.61, 95% CI: -7.45, -1.78). We observed no associations between urine MBzP and breast density measures. CONCLUSION In this cohort of Latina girls, PFOA serum concentrations corresponded to a decrease in % FGV. No effect was observed between MBzP and breast density measures across pubertal WOS.
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Affiliation(s)
- Claire E Kim
- Department of Epidemiology, University of California Los Angeles, Los Angeles, CA, USA
| | - Alexandra M Binder
- Department of Epidemiology, University of California Los Angeles, Los Angeles, CA, USA; Population Sciences in the Pacific Program, University of Hawaii Cancer, Honolulu, HI, USA
| | - Camila Corvalan
- Institute of Nutrition and Food Technology, University of Chile, Santiago, Chile
| | - Ana Pereira
- Institute of Nutrition and Food Technology, University of Chile, Santiago, Chile
| | - John Shepherd
- Population Sciences in the Pacific Program, University of Hawaii Cancer, Honolulu, HI, USA
| | - Antonia M Calafat
- National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - Julianne C Botelho
- National Center for Environmental Health, Centers for Disease Control and Prevention, Atlanta, GA, USA
| | - John M Hampton
- Department of Population Health Sciences and Carbone Cancer Center, School of Medicine and Public Health, University of Wisconsin - Madison, Madison, USA
| | - Amy Trentham-Dietz
- Department of Population Health Sciences and Carbone Cancer Center, School of Medicine and Public Health, University of Wisconsin - Madison, Madison, USA
| | - Karin B Michels
- Department of Epidemiology, University of California Los Angeles, Los Angeles, CA, USA; Institute for Prevention and Cancer Epidemiology, Faculty of Medicine and Medical Center, University of Freiburg, Freiburg, Germany.
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Pauciullo A, Versace C, Gaspa G, Letaief N, Bedhiaf-Romdhani S, Fulgione A, Cosenza G. Sequencing and Characterization of αs2-Casein Gene ( CSN1S2) in the Old-World Camels Have Proven Genetic Variations Useful for the Understanding of Species Diversification. Animals (Basel) 2023; 13:2805. [PMID: 37685069 PMCID: PMC10487017 DOI: 10.3390/ani13172805] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 09/01/2023] [Accepted: 09/01/2023] [Indexed: 09/10/2023] Open
Abstract
The CSN1S2 gene encodes αs2-casein, the third most abundant protein in camel milk. Despite its importance in foals, human nutrition, and dairy processing, the CSN1S2 gene in camels has received little attention. This study presents the first complete characterization of the CSN1S2 gene sequence in Old-World camels (Camelus bactrianus and Camelus dromedarius). Additionally, the gene promoter, consisting of 752 bp upstream of exon 1, was analyzed. The entire gene comprises 17 exons, ranging in length from 24 bp (exons 4, 8, 11, and 13) to 280 bp (exon 17). Interesting was the identification of the exon 12 in both species. The promoter analysis revealed 24 putative binding sites in the Bactrian camel and 22 in dromedary camel. Most of these sites were typical elements associated with milk protein, such as C/EBP-α, C/EBP-β, Oct-1, and AP1. The SNP discovery showed relatively high genetic diversity compared to other camel casein genes (CSN1S1, CSN2, and CSN3), with a total of 34 polymorphic sites across the two species. Particularly noteworthy is the transition g.311G>A in the CSN1S2 promoter, creating a new putative consensus binding site for a C/EBP-β in the Bactrian camel. At the exon level, two novel variants were found. One was detected in exon 6 of the Bactrian camel (g.3639C>G), resulting in an amino acid replacement, p.36Ile>Met. The second variant was found in noncoding exon 17 of dromedary CSN1S2 (g.1511G>T). Although this mutation occurs in the 3'-UnTranslated Region, it represents the first example of exonic polymorphism in the CSN1S2 for this species. This SNP also affects the binding sites of different microRNAs, including the seed sequence of the miRNA 4662a-3p, highlighting its role as a regulatory factor for CSN1S2 gene. A PCR-RFLP was set up for genotyping a dromedary Tunisian population (n = 157), and the minor allele frequency was found to be 0.27 for the G allele, indicating a potential yield improvement margin. The interspersed elements (INEs) analysis revealed 10 INEs covering 7.34% and 8.14% of the CSN1S2 sequence in the Bactrian and dromedary camels, respectively. Furthermore, six elements (A, B, F, H, I, and L) are shared among cattle and camels and are partially found in other ruminants, suggesting a common ancestral origin of these retrotransposons. Conversely, elements C, D, E, and G are specific to camels.
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Affiliation(s)
- Alfredo Pauciullo
- Department of Agriculture, Forest and Food Sciences, University of Torino, 10095 Grugliasco, Italy
| | - Carmine Versace
- Department of Agriculture, Forest and Food Sciences, University of Torino, 10095 Grugliasco, Italy
| | - Giustino Gaspa
- Department of Agriculture, Forest and Food Sciences, University of Torino, 10095 Grugliasco, Italy
| | - Neyrouz Letaief
- Department of Agriculture, Forest and Food Sciences, University of Torino, 10095 Grugliasco, Italy
- Laboratory of Animal and Forage Production, National Agricultural Research Institute of Tunisia, University of Carthage, Ariana 1004, Tunisia
| | - Sonia Bedhiaf-Romdhani
- Laboratory of Animal and Forage Production, National Agricultural Research Institute of Tunisia, University of Carthage, Ariana 1004, Tunisia
| | - Andrea Fulgione
- Department of Agriculture, University of Napoli Federico II, 80055 Portici, Italy
| | - Gianfranco Cosenza
- Department of Agriculture, University of Napoli Federico II, 80055 Portici, Italy
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Mukherjee Das A, Gogia A, Garg M, Elaiyaraja A, Arambam P, Mathur S, Babu-Rajendran R, Deo SVS, Kumar L, Das BC, Janardhanan R. Urinary concentration of endocrine-disrupting phthalates and breast cancer risk in Indian women: A case-control study with a focus on mutations in phthalate-responsive genes. Cancer Epidemiol 2022; 79:102188. [PMID: 35688051 DOI: 10.1016/j.canep.2022.102188] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2021] [Revised: 05/09/2022] [Accepted: 05/10/2022] [Indexed: 11/26/2022]
Abstract
BACKGROUND Phthalates are known endocrine-disrupting chemicals used indiscriminately as constituents in consumer products including food processing, and packaging, cosmetics, personal care and household items. Although, few studies have assessed the risk of breast cancer on exposure to phthalates, their association with breast cancer risk in Indian women have not yet been evaluated. METHODS We conducted a case-control study involving 171 participants. Urinary concentrations of six phthalate dieters; DMP (Dimethyl phthalate), DEP (Diethyl phthalate), DBP (Dibutyl phthalate), BBP (benzyl butyl phthalate), DEHP (Di-2-ethyl-hexyl phthalate), DINOP (Di-n-octyl phthalate) were estimated by GC-MS and geometric means were calculated. Univariate and multivariable logistic regression was performed to assess breast cancer risk on exposure to phthalates. Genes responsive to phthalates were identified through literature search and matched with NGS data, and gene-enrichment analysis was performed. RESULTS Significant associations were observed between urinary phthalate concentrations and increased risk of breast cancer for di-butyl phthalate (OR=1.5, 95% CI; 1.06, 2.11, p = 0.002) and di-2-ethyl-hexyl phthalate (>median vs ≤ median; OR=2.97, 95% CI; 1.18, 7.47, p = 0.005) in multivariable analyses. We also found several phthalate-responsive gene mutations in paired breast tumor tissues, which include PTPRD (76.19%), AR (42.86%), CYP1A1 (42.86%), CYP19A1 (23.81%), AHRR (19.05%), PIK3CA (19.05%), CYP1B1 (9.52%), RB1 (9.52%) and MMP9 (9.52%). Gene-enrichment analysis revealed that these genes form a major part of ER/PR, PPAR and HIF-1α-TGF-β signaling cascades involved in breast cancer CONCLUSION: Although the sample size is small, in this first case-control study from India, DBP and DEHP were found to be associated with increased risk of invasive breast cancer and tumor tissues revealed mutations in several phthalate-responsive genes. It is, therefore suggested that human biomonitoring in India and larger studies evaluating the early life genetic and epigenetic alterations on phthalates exposure are required to establish their role in breast carcinogenesis.
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Affiliation(s)
- Ankan Mukherjee Das
- Laboratory of Disease Dynamics and Molecular Epidemiology, Amity Institute of Public Health, Amity University Uttar Pradesh, Noida, India
| | - Ajay Gogia
- Department of Medical Oncology, Institute Rotary Cancer Hospital, All India Institute of Medical Sciences, New Delhi, India.
| | - Manoj Garg
- Stem Cell and Cancer Research Lab, Amity Institute of Molecular Medicine and Stem Cell Research, Amity University Uttar Pradesh, Noida, India
| | - Arun Elaiyaraja
- Ecotoxicology and Toxicogenomics Lab, Department of Environmental Biotechnology, Bharathidasan University, Tamil Nadu, India
| | - Priyadarshini Arambam
- Laboratory of Disease Dynamics and Molecular Epidemiology, Amity Institute of Public Health, Amity University Uttar Pradesh, Noida, India; Batra Hospital and Medical Research Centre, New Delhi, India
| | - Sandeep Mathur
- Department of Pathology, All India Institute of Medical Sciences, New Delhi, India
| | - Ramaswamy Babu-Rajendran
- Ecotoxicology and Toxicogenomics Lab, Department of Environmental Biotechnology, Bharathidasan University, Tamil Nadu, India
| | - S V S Deo
- Department of Surgical Oncology, Institute Rotary Cancer Hospital, All India Institute of Medical Sciences, New Delhi, India
| | - Lalit Kumar
- Department of Medical Oncology, Institute Rotary Cancer Hospital, All India Institute of Medical Sciences, New Delhi, India
| | - Bhudev C Das
- Stem Cell and Cancer Research Lab, Amity Institute of Molecular Medicine and Stem Cell Research, Amity University Uttar Pradesh, Noida, India.
| | - Rajiv Janardhanan
- Laboratory of Disease Dynamics and Molecular Epidemiology, Amity Institute of Public Health, Amity University Uttar Pradesh, Noida, India.
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Environmental Contamination and Chronic Exposure to Endocrine-Disrupting Phthalates: An Overlooked and Emerging Determinant for Hormone-Sensitive Cancers. J Indian Inst Sci 2022. [DOI: 10.1007/s41745-022-00319-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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6
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Su Y, Santucci-Pereira J, Dang NM, Kanefsky J, Rahulkannan V, Hillegass M, Joshi S, Gurdogan H, Chen Z, Bessonneau V, Rudel R, Ser-Dolansky J, Schneider SS, Russo J. Effects of Pubertal Exposure to Butyl Benzyl Phthalate, Perfluorooctanoic Acid, and Zeranol on Mammary Gland Development and Tumorigenesis in Rats. Int J Mol Sci 2022; 23:ijms23031398. [PMID: 35163327 PMCID: PMC8835802 DOI: 10.3390/ijms23031398] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 01/18/2022] [Accepted: 01/24/2022] [Indexed: 02/04/2023] Open
Abstract
Endocrine-disrupting chemicals (EDCs)—including butyl benzyl phthalate (BBP), perfluorooctanoic acid (PFOA), and zeranol (α-ZAL, referred to as ZAL hereafter)—can interfere with the endocrine system and produce adverse effects. It remains unclear whether pubertal exposure to low doses of BBP, PFOA, and ZAL has an impact on breast development and tumorigenesis. We exposed female Sprague Dawley rats to BBP, PFOA, or ZAL through gavage for 21 days, starting on day 21, and analyzed their endocrine organs, serum hormones, mammary glands, and transcriptomic profiles of the mammary glands at days 50 and 100. We also conducted a tumorigenesis study for rats treated with PFOA and ZAL using a 7,12-dimethylbenz[a]anthracene (DMBA) model. Our results demonstrated that pubertal exposure to BBP, PFOA, and ZAL affected endocrine organs and serum hormones, and induced phenotypic and transcriptomic changes. The exposure to PFOA + ZAL induced the most phenotypic and transcriptomic changes in the mammary gland. PFOA + ZAL downregulated the expression of genes related to development at day 50, whereas it upregulated genes associated with tumorigenesis at day 100. PFOA + ZAL exposure also decreased rat mammary tumor latency, reduced the overall survival of rats after DMBA challenge, and affected the histopathology of mammary tumors. Therefore, our study suggests that exposure to low doses of EDCs during the pubertal period could induce changes in the endocrine system and mammary gland development in rats. The inhibition of mammary gland development by PFOA + ZAL might increase the risk of developing mammary tumors through activation of signaling pathways associated with tumorigenesis.
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Affiliation(s)
- Yanrong Su
- The Irma H Russo, MD-Breast Cancer Research Laboratory, Fox Chase Cancer Center-Temple Health, 333 Cottman Avenue, Philadelphia, PA 19111, USA; (J.S.-P.); (N.M.D.); (J.K.); (V.R.); (M.H.); (S.J.); (H.G.); (Z.C.); (J.R.)
- Correspondence:
| | - Julia Santucci-Pereira
- The Irma H Russo, MD-Breast Cancer Research Laboratory, Fox Chase Cancer Center-Temple Health, 333 Cottman Avenue, Philadelphia, PA 19111, USA; (J.S.-P.); (N.M.D.); (J.K.); (V.R.); (M.H.); (S.J.); (H.G.); (Z.C.); (J.R.)
| | - Nhi M. Dang
- The Irma H Russo, MD-Breast Cancer Research Laboratory, Fox Chase Cancer Center-Temple Health, 333 Cottman Avenue, Philadelphia, PA 19111, USA; (J.S.-P.); (N.M.D.); (J.K.); (V.R.); (M.H.); (S.J.); (H.G.); (Z.C.); (J.R.)
| | - Joice Kanefsky
- The Irma H Russo, MD-Breast Cancer Research Laboratory, Fox Chase Cancer Center-Temple Health, 333 Cottman Avenue, Philadelphia, PA 19111, USA; (J.S.-P.); (N.M.D.); (J.K.); (V.R.); (M.H.); (S.J.); (H.G.); (Z.C.); (J.R.)
| | - Vishnuprabha Rahulkannan
- The Irma H Russo, MD-Breast Cancer Research Laboratory, Fox Chase Cancer Center-Temple Health, 333 Cottman Avenue, Philadelphia, PA 19111, USA; (J.S.-P.); (N.M.D.); (J.K.); (V.R.); (M.H.); (S.J.); (H.G.); (Z.C.); (J.R.)
| | - Meardey Hillegass
- The Irma H Russo, MD-Breast Cancer Research Laboratory, Fox Chase Cancer Center-Temple Health, 333 Cottman Avenue, Philadelphia, PA 19111, USA; (J.S.-P.); (N.M.D.); (J.K.); (V.R.); (M.H.); (S.J.); (H.G.); (Z.C.); (J.R.)
| | - Shalina Joshi
- The Irma H Russo, MD-Breast Cancer Research Laboratory, Fox Chase Cancer Center-Temple Health, 333 Cottman Avenue, Philadelphia, PA 19111, USA; (J.S.-P.); (N.M.D.); (J.K.); (V.R.); (M.H.); (S.J.); (H.G.); (Z.C.); (J.R.)
| | - Hafsa Gurdogan
- The Irma H Russo, MD-Breast Cancer Research Laboratory, Fox Chase Cancer Center-Temple Health, 333 Cottman Avenue, Philadelphia, PA 19111, USA; (J.S.-P.); (N.M.D.); (J.K.); (V.R.); (M.H.); (S.J.); (H.G.); (Z.C.); (J.R.)
| | - Zhen Chen
- The Irma H Russo, MD-Breast Cancer Research Laboratory, Fox Chase Cancer Center-Temple Health, 333 Cottman Avenue, Philadelphia, PA 19111, USA; (J.S.-P.); (N.M.D.); (J.K.); (V.R.); (M.H.); (S.J.); (H.G.); (Z.C.); (J.R.)
| | - Vincent Bessonneau
- Silent Spring Institute, 320 Nevada Street, Suite 302, Newton, MA 02460, USA; (V.B.); (R.R.)
| | - Ruthann Rudel
- Silent Spring Institute, 320 Nevada Street, Suite 302, Newton, MA 02460, USA; (V.B.); (R.R.)
| | - Jennifer Ser-Dolansky
- Pioneer Valley Life Sciences Institute, UMASS Chan Medical School-Baystate, Springfield, MA 01199, USA; (J.S.-D.); (S.S.S.)
| | - Sallie S. Schneider
- Pioneer Valley Life Sciences Institute, UMASS Chan Medical School-Baystate, Springfield, MA 01199, USA; (J.S.-D.); (S.S.S.)
| | - Jose Russo
- The Irma H Russo, MD-Breast Cancer Research Laboratory, Fox Chase Cancer Center-Temple Health, 333 Cottman Avenue, Philadelphia, PA 19111, USA; (J.S.-P.); (N.M.D.); (J.K.); (V.R.); (M.H.); (S.J.); (H.G.); (Z.C.); (J.R.)
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Criswell R, Crawford KA, Bucinca H, Romano ME. Endocrine-disrupting chemicals and breastfeeding duration: a review. Curr Opin Endocrinol Diabetes Obes 2020; 27:388-395. [PMID: 33027070 PMCID: PMC7968861 DOI: 10.1097/med.0000000000000577] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
PURPOSE OF REVIEW The purpose of this review is to describe epidemiologic and toxicological literature investigating how endocrine-disrupting chemicals (EDCs) affect mammary gland development and function, thereby impacting lactation duration. RECENT FINDINGS Perfluoroalkyl and polyfluoroalkyl substances appear to reduce breastfeeding duration through impaired mammary gland development, lactogenesis, and suppressed endocrine signaling. Halogenated aromatic hydrocarbons have differing associations with lactation duration, likely because of the variety of signaling pathways that they affect, pointing to the importance of complex mixtures in epidemiologic studies. Although epidemiologic literature suggests that pesticides and fungicides decrease or have no effect on lactation duration, toxicology literature suggests enhanced mammary gland development through estrogenic and/or antiandrogenic pathways. Toxicological studies suggest that phthalates may affect mammary gland development via estrogenic pathways but no association with lactation duration has been observed. Bisphenol A was associated with decreased duration of breastfeeding, likely through direct and indirect action on estrogenic pathways. SUMMARY EDCs play a role in mammary gland development, function, and lactogenesis, which can affect breastfeeding duration. Further research should explore direct mechanisms of EDCs on lactation, the significance of toxicant mixtures, and transgenerational effects of EDCs on lactation.
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Affiliation(s)
| | - Kathryn A. Crawford
- Department of Epidemiology, Dartmouth Geisel School of Medicine, Lebanon, NH
- Environmental Studies Program, Middlebury College, Middlebury, VT
| | - Hana Bucinca
- Research and Quality Improvement Program, Action for Mothers and Children, Prishtina, Kosovo
- Department of Pharmacy, Rezonanca College of Medical Sciences, Prishtina, Kosovo
| | - Megan E. Romano
- Department of Epidemiology, Dartmouth Geisel School of Medicine, Lebanon, NH
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Gene expression profiles for low-dose exposure to diethyl phthalate in rodents and humans: a translational study with implications for breast carcinogenesis. Sci Rep 2020; 10:7067. [PMID: 32341500 PMCID: PMC7184607 DOI: 10.1038/s41598-020-63904-w] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2019] [Accepted: 03/05/2020] [Indexed: 12/28/2022] Open
Abstract
Phthalates are commonly included as ingredients in personal care products such as cosmetics, shampoos and perfumes. Diethyl phthalate (DEP) has been found to be anti-androgenic and linked with adverse reproductive effects on males, but effects on females are poorly understood. We designed an integrative and translational study to experimentally examine the effects of DEP exposure at a human-equivalent dose on the mammary transcriptome in rats and to subsequently examine the DEP gene signature in breast tissues (both pre-malignant and tumor) from a population study. In Sprague-Dawley rats treated orally with DEP from birth to adulthood, we identified a signature panel of 107 genes predominantly down-regulated by DEP exposure. Univariate analysis of this 107 DEP gene signature in pre-malignant breast tissues revealed that six genes (P4HA1, MPZL3, TMC4, PLEKHA6, CA8, AREG) were inversely associated with monoethyl phthalate (MEP; the urinary metabolite of DEP) concentration (p < 0.05) among postmenopausal women; all six genes loaded on to one of seven factors identified by factor analysis. Transcription factor enrichment analysis revealed that genes in this factor were enriched for androgen receptor binding sites. These six genes were also significantly down-regulated in pre-malignant adjacent tissues compared to the corresponding tumor tissues in pair-wise analyses (p < 0.05). Results from our translational study indicate that low level exposure to diethyl phthalate results in measurable genomic changes in breast tissue with implications in breast carcinogenesis.
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Chen JR, Wu SM, Tsai SC, Hsien FC, Huang CT. Changes in vitellogenin and estrogen receptor expression and 17β-estradiol concentration in male juvenile tilapia can be used to evaluate endocrine-disrupting chemicals. Comp Biochem Physiol C Toxicol Pharmacol 2020; 229:108682. [PMID: 31816426 DOI: 10.1016/j.cbpc.2019.108682] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/03/2019] [Revised: 11/28/2019] [Accepted: 12/04/2019] [Indexed: 11/25/2022]
Abstract
The effects of endocrine disruption with respect to potential human toxicities have been extensively evaluated to date. However, the standard testing methods used have not always taken the most pertinent approach. In this study, we used juvenile male tilapia (Oreochromis niloticus) as an animal model to test for endocrine disruption by chemicals. We measured 17β-estradiol (E2) concentrations, and the mRNA relative expression ratio (RER; treatment/control) of vitellogenin (vtg2) and estrogen receptors (ERs) to assess whether the effluent concentration of selected plasticizers disrupt E2 function in fish. We found that the vtg2 RER was significantly increased after exposure to 2.52 nM E2 for 5 days, 0.438 μM of bisphenol A (BPA) for 7 days, or 2.865 μM Cd2+ for 7 days. These data support vtg2 transcript level as a sensitive biomarker to evaluate contamination of water by endocrine disrupting chemicals (EDCs). However, vtg2 expression did not respond to fluctuations of E2 concentrations in the tilapia juveniles exposed to selected plasticizers. However, the RER of three types of ERs appeared to change dramatically upon exposure to plasticizers. ERα significantly increased, but ERβ2 decreased with 3.6 μM DEP exposure. Both ERα and ERβ2 decreased significantly after 1.44 μM DIBP exposure. We suggest that changes of vtg2 mRNA RER, E2 levels and ERs mRNA expression should be taken into consideration at the same time to determine if chemical contaminants in the water are endocrine disrupters.
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Affiliation(s)
- Jung-Ren Chen
- Department of Biological Science and Technology, I-Shou University, Kaohsiung City 82445, Taiwan.
| | - Su Mei Wu
- Department of Aquatic Biosciences, National Chiayi University, Chiayi 60004, Taiwan
| | - Shu Chuan Tsai
- Department of Nursing, Central Taiwan University of Science and Technology, Taichung 40601, Taiwan
| | - Fang-Chun Hsien
- Department of Aquatic Biosciences, National Chiayi University, Chiayi 60004, Taiwan
| | - Chieh Ting Huang
- Department of Aquatic Biosciences, National Chiayi University, Chiayi 60004, Taiwan
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Lou C, Guo D, Zhang K, Wu C, Zhang P, Zhu Y. Simultaneous determination of 11 phthalate esters in bottled beverages by graphene oxide coated hollow fiber membrane extraction coupled with supercritical fluid chromatography. Anal Chim Acta 2018; 1007:71-79. [DOI: 10.1016/j.aca.2017.12.018] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2017] [Revised: 11/08/2017] [Accepted: 12/06/2017] [Indexed: 12/18/2022]
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11
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Gray JM, Rasanayagam S, Engel C, Rizzo J. State of the evidence 2017: an update on the connection between breast cancer and the environment. Environ Health 2017; 16:94. [PMID: 28865460 PMCID: PMC5581466 DOI: 10.1186/s12940-017-0287-4] [Citation(s) in RCA: 109] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2016] [Accepted: 07/17/2017] [Indexed: 05/23/2023]
Abstract
BACKGROUND In this review, we examine the continually expanding and increasingly compelling data linking radiation and various chemicals in our environment to the current high incidence of breast cancer. Singly and in combination, these toxicants may have contributed significantly to the increasing rates of breast cancer observed over the past several decades. Exposures early in development from gestation through adolescence and early adulthood are particularly of concern as they re-shape the program of genetic, epigenetic and physiological processes in the developing mammary system, leading to an increased risk for developing breast cancer. In the 8 years since we last published a comprehensive review of the relevant literature, hundreds of new papers have appeared supporting this link, and in this update, the evidence on this topic is more extensive and of better quality than that previously available. CONCLUSION Increasing evidence from epidemiological studies, as well as a better understanding of mechanisms linking toxicants with development of breast cancer, all reinforce the conclusion that exposures to these substances - many of which are found in common, everyday products and byproducts - may lead to increased risk of developing breast cancer. Moving forward, attention to methodological limitations, especially in relevant epidemiological and animal models, will need to be addressed to allow clearer and more direct connections to be evaluated.
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Affiliation(s)
- Janet M. Gray
- Department of Psychology and Program in Science, Technology, and Society, Vassar College, 124 Raymond Avenue, Poughkeepsie, NY 12604-0246 USA
| | - Sharima Rasanayagam
- Breast Cancer Prevention Partners, 1388 Sutter St., Suite 400, San Francisco, CA 94109-5400 USA
| | - Connie Engel
- Breast Cancer Prevention Partners, 1388 Sutter St., Suite 400, San Francisco, CA 94109-5400 USA
| | - Jeanne Rizzo
- Breast Cancer Prevention Partners, 1388 Sutter St., Suite 400, San Francisco, CA 94109-5400 USA
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12
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Mathieu-Denoncourt J, Martyniuk CJ, Loughery JR, Yargeau V, de Solla SR, Langlois VS. Lethal and sublethal effects of phthalate diesters in Silurana tropicalis larvae. ENVIRONMENTAL TOXICOLOGY AND CHEMISTRY 2016; 35:2511-2522. [PMID: 26924002 DOI: 10.1002/etc.3413] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2015] [Revised: 09/24/2015] [Accepted: 02/24/2016] [Indexed: 06/05/2023]
Abstract
Phthalates are compounds used in polymers to increase their flexibility and are now ubiquitous in the environment as a result of widespread use. Because few studies have focused on the adverse effects of these chemicals in aquatic species, the present study aimed to determine the effects of phthalate diesters in amphibians. Western clawed frog (Silurana tropicalis) tadpoles were acutely exposed to water spiked with monomethyl phthalate (MMP; 1.3-1595.5 mg/L), dimethyl phthalate (DMP; 0.03-924.0 mg/L), or dicyclohexyl phthalate (DCHP; 0.3-99.3 mg/L). Because few studies have addressed the toxicity of these specific phthalates in most organisms, the present study used higher concentrations of these chemicals to determine their toxicity pathways in amphibians and at the same time investigate a suite of genes known to be altered by the well-studied phthalates. Both DMP and DCHP increased larval mortality (9.1-924.0 mg/L DMP and 4.1-99.3 mg/L DCHP), increased frequency of malformations in tadpoles (0.1-34.1 mg/L DMP and 4.1-19.0 mg/L DCHP), and up-regulated cellular stress-related messenger-RNA (mRNA) levels (4.1 mg/L DCHP). To characterize the molecular toxicity pathway of these phthalates in tadpoles, transcriptome analysis was conducted using a custom microarray. Parametric analysis of gene set enrichment revealed important changes in the expression of genes related to drug metabolism and transport, liver metabolism, xenobiotic clearance, and xenobiotic metabolism after DMP and DCHP treatments, although these responses were less pronounced with MMP (the metabolite of DMP). The present study is one of the few studies that demonstrated complementarity between gene expression analysis and organismal effects. Environ Toxicol Chem 2016;35:2511-2522. © 2016 SETAC.
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Affiliation(s)
- Justine Mathieu-Denoncourt
- Chemistry and Chemical Engineering Department, Royal Military College of Canada, Kingston, Ontario, Canada
| | - Christopher J Martyniuk
- Department of Physiological Sciences and Center for Environmental and Human Toxicology, UF Genetics Institute, University of Florida, Gainesville, Florida, USA
- Department of Biology, University of New Brunswick and Canadian Rivers Institute, New Brunswick, Canada
| | - Jennifer R Loughery
- Department of Biology, University of New Brunswick and Canadian Rivers Institute, New Brunswick, Canada
| | - Viviane Yargeau
- Department of Chemical Engineering, McGill University, Quebec, Canada
| | - Shane R de Solla
- Wildlife and Landscape Science Directorate, Environment and Climate Change Canada, Burlington, Ontario, Canada
| | - Valerie S Langlois
- Chemistry and Chemical Engineering Department, Royal Military College of Canada, Kingston, Ontario, Canada.
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Pham N, Iyer S, Hackett E, Lock BH, Sandy M, Zeise L, Solomon G, Marty M. Using ToxCast to Explore Chemical Activities and Hazard Traits: A Case Study WithOrtho-Phthalates. Toxicol Sci 2016; 151:286-301. [DOI: 10.1093/toxsci/kfw049] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022] Open
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14
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Gore AC, Chappell VA, Fenton SE, Flaws JA, Nadal A, Prins GS, Toppari J, Zoeller RT. EDC-2: The Endocrine Society's Second Scientific Statement on Endocrine-Disrupting Chemicals. Endocr Rev 2015; 36:E1-E150. [PMID: 26544531 PMCID: PMC4702494 DOI: 10.1210/er.2015-1010] [Citation(s) in RCA: 1244] [Impact Index Per Article: 138.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2015] [Accepted: 09/01/2015] [Indexed: 02/06/2023]
Abstract
The Endocrine Society's first Scientific Statement in 2009 provided a wake-up call to the scientific community about how environmental endocrine-disrupting chemicals (EDCs) affect health and disease. Five years later, a substantially larger body of literature has solidified our understanding of plausible mechanisms underlying EDC actions and how exposures in animals and humans-especially during development-may lay the foundations for disease later in life. At this point in history, we have much stronger knowledge about how EDCs alter gene-environment interactions via physiological, cellular, molecular, and epigenetic changes, thereby producing effects in exposed individuals as well as their descendants. Causal links between exposure and manifestation of disease are substantiated by experimental animal models and are consistent with correlative epidemiological data in humans. There are several caveats because differences in how experimental animal work is conducted can lead to difficulties in drawing broad conclusions, and we must continue to be cautious about inferring causality in humans. In this second Scientific Statement, we reviewed the literature on a subset of topics for which the translational evidence is strongest: 1) obesity and diabetes; 2) female reproduction; 3) male reproduction; 4) hormone-sensitive cancers in females; 5) prostate; 6) thyroid; and 7) neurodevelopment and neuroendocrine systems. Our inclusion criteria for studies were those conducted predominantly in the past 5 years deemed to be of high quality based on appropriate negative and positive control groups or populations, adequate sample size and experimental design, and mammalian animal studies with exposure levels in a range that was relevant to humans. We also focused on studies using the developmental origins of health and disease model. No report was excluded based on a positive or negative effect of the EDC exposure. The bulk of the results across the board strengthen the evidence for endocrine health-related actions of EDCs. Based on this much more complete understanding of the endocrine principles by which EDCs act, including nonmonotonic dose-responses, low-dose effects, and developmental vulnerability, these findings can be much better translated to human health. Armed with this information, researchers, physicians, and other healthcare providers can guide regulators and policymakers as they make responsible decisions.
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Affiliation(s)
- A C Gore
- Pharmacology and Toxicology (A.C.G.), College of Pharmacy, The University of Texas at Austin, Austin, Texas 78734; Division of the National Toxicology Program (V.A.C., S.E.F.), National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina 27709; Department of Comparative Biosciences (J.A.F.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61802; Institute of Bioengineering and CIBERDEM (A.N.), Miguel Hernandez University of Elche, 03202 Elche, Alicante, Spain; Departments of Urology, Pathology, and Physiology & Biophysics (G.S.P.), College of Medicine, University of Illinois at Chicago, Chicago, Illinois 60612; Departments of Physiology and Pediatrics (J.T.), University of Turku and Turku University Hospital, 20520 Turku, Finland; and Biology Department (R.T.Z.), University of Massachusetts at Amherst, Amherst, Massachusetts 01003
| | - V A Chappell
- Pharmacology and Toxicology (A.C.G.), College of Pharmacy, The University of Texas at Austin, Austin, Texas 78734; Division of the National Toxicology Program (V.A.C., S.E.F.), National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina 27709; Department of Comparative Biosciences (J.A.F.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61802; Institute of Bioengineering and CIBERDEM (A.N.), Miguel Hernandez University of Elche, 03202 Elche, Alicante, Spain; Departments of Urology, Pathology, and Physiology & Biophysics (G.S.P.), College of Medicine, University of Illinois at Chicago, Chicago, Illinois 60612; Departments of Physiology and Pediatrics (J.T.), University of Turku and Turku University Hospital, 20520 Turku, Finland; and Biology Department (R.T.Z.), University of Massachusetts at Amherst, Amherst, Massachusetts 01003
| | - S E Fenton
- Pharmacology and Toxicology (A.C.G.), College of Pharmacy, The University of Texas at Austin, Austin, Texas 78734; Division of the National Toxicology Program (V.A.C., S.E.F.), National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina 27709; Department of Comparative Biosciences (J.A.F.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61802; Institute of Bioengineering and CIBERDEM (A.N.), Miguel Hernandez University of Elche, 03202 Elche, Alicante, Spain; Departments of Urology, Pathology, and Physiology & Biophysics (G.S.P.), College of Medicine, University of Illinois at Chicago, Chicago, Illinois 60612; Departments of Physiology and Pediatrics (J.T.), University of Turku and Turku University Hospital, 20520 Turku, Finland; and Biology Department (R.T.Z.), University of Massachusetts at Amherst, Amherst, Massachusetts 01003
| | - J A Flaws
- Pharmacology and Toxicology (A.C.G.), College of Pharmacy, The University of Texas at Austin, Austin, Texas 78734; Division of the National Toxicology Program (V.A.C., S.E.F.), National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina 27709; Department of Comparative Biosciences (J.A.F.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61802; Institute of Bioengineering and CIBERDEM (A.N.), Miguel Hernandez University of Elche, 03202 Elche, Alicante, Spain; Departments of Urology, Pathology, and Physiology & Biophysics (G.S.P.), College of Medicine, University of Illinois at Chicago, Chicago, Illinois 60612; Departments of Physiology and Pediatrics (J.T.), University of Turku and Turku University Hospital, 20520 Turku, Finland; and Biology Department (R.T.Z.), University of Massachusetts at Amherst, Amherst, Massachusetts 01003
| | - A Nadal
- Pharmacology and Toxicology (A.C.G.), College of Pharmacy, The University of Texas at Austin, Austin, Texas 78734; Division of the National Toxicology Program (V.A.C., S.E.F.), National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina 27709; Department of Comparative Biosciences (J.A.F.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61802; Institute of Bioengineering and CIBERDEM (A.N.), Miguel Hernandez University of Elche, 03202 Elche, Alicante, Spain; Departments of Urology, Pathology, and Physiology & Biophysics (G.S.P.), College of Medicine, University of Illinois at Chicago, Chicago, Illinois 60612; Departments of Physiology and Pediatrics (J.T.), University of Turku and Turku University Hospital, 20520 Turku, Finland; and Biology Department (R.T.Z.), University of Massachusetts at Amherst, Amherst, Massachusetts 01003
| | - G S Prins
- Pharmacology and Toxicology (A.C.G.), College of Pharmacy, The University of Texas at Austin, Austin, Texas 78734; Division of the National Toxicology Program (V.A.C., S.E.F.), National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina 27709; Department of Comparative Biosciences (J.A.F.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61802; Institute of Bioengineering and CIBERDEM (A.N.), Miguel Hernandez University of Elche, 03202 Elche, Alicante, Spain; Departments of Urology, Pathology, and Physiology & Biophysics (G.S.P.), College of Medicine, University of Illinois at Chicago, Chicago, Illinois 60612; Departments of Physiology and Pediatrics (J.T.), University of Turku and Turku University Hospital, 20520 Turku, Finland; and Biology Department (R.T.Z.), University of Massachusetts at Amherst, Amherst, Massachusetts 01003
| | - J Toppari
- Pharmacology and Toxicology (A.C.G.), College of Pharmacy, The University of Texas at Austin, Austin, Texas 78734; Division of the National Toxicology Program (V.A.C., S.E.F.), National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina 27709; Department of Comparative Biosciences (J.A.F.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61802; Institute of Bioengineering and CIBERDEM (A.N.), Miguel Hernandez University of Elche, 03202 Elche, Alicante, Spain; Departments of Urology, Pathology, and Physiology & Biophysics (G.S.P.), College of Medicine, University of Illinois at Chicago, Chicago, Illinois 60612; Departments of Physiology and Pediatrics (J.T.), University of Turku and Turku University Hospital, 20520 Turku, Finland; and Biology Department (R.T.Z.), University of Massachusetts at Amherst, Amherst, Massachusetts 01003
| | - R T Zoeller
- Pharmacology and Toxicology (A.C.G.), College of Pharmacy, The University of Texas at Austin, Austin, Texas 78734; Division of the National Toxicology Program (V.A.C., S.E.F.), National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, North Carolina 27709; Department of Comparative Biosciences (J.A.F.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61802; Institute of Bioengineering and CIBERDEM (A.N.), Miguel Hernandez University of Elche, 03202 Elche, Alicante, Spain; Departments of Urology, Pathology, and Physiology & Biophysics (G.S.P.), College of Medicine, University of Illinois at Chicago, Chicago, Illinois 60612; Departments of Physiology and Pediatrics (J.T.), University of Turku and Turku University Hospital, 20520 Turku, Finland; and Biology Department (R.T.Z.), University of Massachusetts at Amherst, Amherst, Massachusetts 01003
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Mathieu-Denoncourt J, Wallace SJ, de Solla SR, Langlois VS. Plasticizer endocrine disruption: Highlighting developmental and reproductive effects in mammals and non-mammalian aquatic species. Gen Comp Endocrinol 2015; 219:74-88. [PMID: 25448254 DOI: 10.1016/j.ygcen.2014.11.003] [Citation(s) in RCA: 161] [Impact Index Per Article: 17.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/30/2014] [Revised: 10/30/2014] [Accepted: 11/03/2014] [Indexed: 10/24/2022]
Abstract
Due to their versatility, robustness, and low production costs, plastics are used in a wide variety of applications. Plasticizers are mixed with polymers to increase flexibility of plastics. However, plasticizers are not covalently bound to plastics, and thus leach from products into the environment. Several studies have reported that two common plasticizers, bisphenol A (BPA) and phthalates, induce adverse health effects in vertebrates; however few studies have addressed their toxicity to non-mammalian species. The aim of this review is to compare the effects of plasticizers in animals, with a focus on aquatic species. In summary, we identified three main chains of events that occur in animals exposed to BPA and phthalates. Firstly, plasticizers affect development by altering both the thyroid hormone and growth hormone axes. Secondly, these chemicals interfere with reproduction by decreasing cholesterol transport through the mitochondrial membrane, leading to reduced steroidogenesis. Lastly, exposure to plasticizers leads to the activation of peroxisome proliferator-activated receptors, the increase of fatty acid oxidation, and the reduction in the ability to cope with the augmented oxidative stress leading to reproductive organ malformations, reproductive defects, and decreased fertility.
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Affiliation(s)
- Justine Mathieu-Denoncourt
- Chemistry and Chemical Engineering Department, Royal Military College of Canada, Kingston, ON K7K 7B4, Canada
| | - Sarah J Wallace
- Chemistry and Chemical Engineering Department, Royal Military College of Canada, Kingston, ON K7K 7B4, Canada
| | - Shane R de Solla
- Wildlife and Landscape Science Directorate, Environment Canada, Burlington, ON L7R 4A6, Canada
| | - Valerie S Langlois
- Chemistry and Chemical Engineering Department, Royal Military College of Canada, Kingston, ON K7K 7B4, Canada.
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Parent AS, Franssen D, Fudvoye J, Gérard A, Bourguignon JP. Developmental variations in environmental influences including endocrine disruptors on pubertal timing and neuroendocrine control: Revision of human observations and mechanistic insight from rodents. Front Neuroendocrinol 2015; 38:12-36. [PMID: 25592640 DOI: 10.1016/j.yfrne.2014.12.004] [Citation(s) in RCA: 105] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/08/2014] [Revised: 12/13/2014] [Accepted: 12/15/2014] [Indexed: 12/21/2022]
Abstract
Puberty presents remarkable individual differences in timing reaching over 5 years in humans. We put emphasis on the two edges of the age distribution of pubertal signs in humans and point to an extended distribution towards earliness for initial pubertal stages and towards lateness for final pubertal stages. Such distortion of distribution is a recent phenomenon. This suggests changing environmental influences including the possible role of nutrition, stress and endocrine disruptors. Our ability to assess neuroendocrine effects and mechanisms is very limited in humans. Using the rodent as a model, we examine the impact of environmental factors on the individual variations in pubertal timing and the possible underlying mechanisms. The capacity of environmental factors to shape functioning of the neuroendocrine system is thought to be maximal during fetal and early postnatal life and possibly less important when approaching the time of onset of puberty.
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Affiliation(s)
- Anne-Simone Parent
- Developmental Neuroendocrinology Unit, GIGA Neurosciences, University of Liège, Sart-Tilman, B-4000 Liège, Belgium; Department of Pediatrics, CHU de Liège, Rue de Gaillarmont 600, B-4032 Chênée, Belgium
| | - Delphine Franssen
- Developmental Neuroendocrinology Unit, GIGA Neurosciences, University of Liège, Sart-Tilman, B-4000 Liège, Belgium
| | - Julie Fudvoye
- Developmental Neuroendocrinology Unit, GIGA Neurosciences, University of Liège, Sart-Tilman, B-4000 Liège, Belgium; Department of Pediatrics, CHU de Liège, Rue de Gaillarmont 600, B-4032 Chênée, Belgium
| | - Arlette Gérard
- Developmental Neuroendocrinology Unit, GIGA Neurosciences, University of Liège, Sart-Tilman, B-4000 Liège, Belgium; Department of Pediatrics, CHU de Liège, Rue de Gaillarmont 600, B-4032 Chênée, Belgium
| | - Jean-Pierre Bourguignon
- Developmental Neuroendocrinology Unit, GIGA Neurosciences, University of Liège, Sart-Tilman, B-4000 Liège, Belgium; Department of Pediatrics, CHU de Liège, Rue de Gaillarmont 600, B-4032 Chênée, Belgium.
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17
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Advancing research on endocrine disrupting chemicals in breast cancer: Expert panel recommendations. Reprod Toxicol 2014; 54:141-7. [PMID: 25549947 DOI: 10.1016/j.reprotox.2014.12.015] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Revised: 12/05/2014] [Accepted: 12/19/2014] [Indexed: 12/19/2022]
Abstract
Breast cancer incidence continues to increase in the US and Europe, a reflection of the growing influence of environment factors that interact with personal genetics. The US Environmental Protection Agency estimates that there are approximately 10,000 endocrine disrupting chemicals among the common daily exposures that could affect the risk of disease. The daunting tasks of identifying, characterizing, and elucidating the mechanisms of endocrine disrupting chemicals in breast cancer need to be addressed to produce a comprehensive model that will facilitate preventive strategies and public policy. An expert panel met to describe and bring attention to needs linking common environmental exposures, critical windows of exposure, and optimal times of assessment in investigating breast cancer risk. The group included investigators with extensive experience in the use of rodent models and in leading population studies and produced a set of recommendations for effective approaches to gaining insights into the environmental origins of breast cancer across the lifespan.
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18
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A comparative proteomic analysis of parthenogenetic lines and amphigenetic lines of silkworm. BIOTECHNOL BIOPROC E 2014. [DOI: 10.1007/s12257-014-0099-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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19
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Fungal biodegradation of dibutyl phthalate and toxicity of its breakdown products on the basis of fungal and bacterial growth. World J Microbiol Biotechnol 2014; 30:2811-9. [DOI: 10.1007/s11274-014-1705-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/07/2014] [Accepted: 07/14/2014] [Indexed: 10/25/2022]
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20
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Miousse IR, Gomez-Acevedo H, Sharma N, Vantrease J, Hennings L, Shankar K, Cleves MA, Badger TM, Ronis MJ. Mammary gland morphology and gene expression signature of weanling male and female rats following exposure to exogenous estradiol. Exp Biol Med (Maywood) 2013; 238:1033-46. [PMID: 23925648 DOI: 10.1177/1535370213497322] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
In order to characterize the actions of xenoestrogens, it is essential to possess a solid portrait of the physiological effects of exogenous estradiol. We assessed effects of three doses of exogenous estradiol (E2) (0.1, 1.0 and 10 µg/kg/day) given between postnatal days 21 and 33 on the mammary gland morphology and gene expression profiles of male and female rats compared to vehicle-treated controls. The male mammary gland was more responsive to E2 treatment than in females, with 509 genes regulated >2-fold in a dose-dependent manner in males and only 174 in females. In males, E2 treatment significantly (P < 0.01) increased the number of terminal end buds (TEBs) and the expression of proliferating cell nuclear antigen (PCNA) protein (P < 0.05), both of which are indicators of proliferation. This change was linked to a significant increase (P < 0.05) in the expression of the gene encoding amphiregulin, which is known to induce TEB formation. There was also a dose-dependent increase (P < 0.001) in the estrogen-regulated gene encoding the progesterone receptor. In intact females, despite lack of changes in mammary morphology, we observed a dose-dependent increase (P < 0.05) in the expression of genes encoding three milk proteins: whey acidic protein, casein beta and casein kappa. There was a significant (P < 0.05) downregulation of both estrogen receptors in response to E2 treatment. These results suggest that mammary glands of male rats are very sensitive to exogenous E2 during development post-weaning. The dose-dependent increase observed in amphiregulin and progesterone receptor gene expression was linked to morphological changes and represents a reliable and sensitive tool to evaluate estrogenicity. In contrast, intact weanling female rats were less responsive.
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Macon MB, Fenton SE. Endocrine disruptors and the breast: early life effects and later life disease. J Mammary Gland Biol Neoplasia 2013; 18:43-61. [PMID: 23417729 PMCID: PMC3682794 DOI: 10.1007/s10911-013-9275-7] [Citation(s) in RCA: 105] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/18/2012] [Accepted: 01/16/2013] [Indexed: 01/09/2023] Open
Abstract
Breast cancer risk has both heritable and environment/lifestyle components. The heritable component is a small contribution (5-27 %), leaving the majority of risk to environment (e.g., applied chemicals, food residues, occupational hazards, pharmaceuticals, stress) and lifestyle (e.g., physical activity, cosmetics, water source, alcohol, smoking). However, these factors are not well-defined, primarily due to the enormous number of factors to be considered. In both humans and rodent models, environmental factors that act as endocrine disrupting compounds (EDCs) have been shown to disrupt normal mammary development and lead to adverse lifelong consequences, especially when exposures occur during early life. EDCs can act directly or indirectly on mammary tissue to increase sensitivity to chemical carcinogens or enhance development of hyperplasia, beaded ducts, or tumors. Protective effects have also been reported. The mechanisms for these changes are not well understood. Environmental agents may also act as carcinogens in adult rodent models, directly causing or promoting tumor development, typically in more than one organ. Many of the environmental agents that act as EDCs and are known to affect the breast are discussed. Understanding the mechanism(s) of action for these compounds will be critical to prevent their effects on the breast in the future.
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Affiliation(s)
- Madisa B. Macon
- Curriculum in Toxicology, University of North Carolina, Chapel Hill, NC, USA
- NTP Laboratories, Division of the National Toxicology Program, NIEHS, NIH, 111 TW Alexander Dr, Bldg 101, MD E1-08, Research Triangle Park, NC 27709, USA
| | - Suzanne E. Fenton
- NTP Laboratories, Division of the National Toxicology Program, NIEHS, NIH, 111 TW Alexander Dr, Bldg 101, MD E1-08, Research Triangle Park, NC 27709, USA
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El Sheikh Saad H, Toullec A, Vacher S, Pocard M, Bieche I, Perrot-Applanat M. In utero and lactational exposure to vinclozolin and genistein induces genomic changes in the rat mammary gland. J Endocrinol 2013; 216:245-63. [PMID: 23160963 DOI: 10.1530/joe-12-0395] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Exposure to low doses of environmental estrogens such as bisphenol A and genistein (G) alters mammary gland development. The effects of environmental anti-androgens, such as the fungicide vinclozolin (V), on mammary gland morphogenesis are unknown. We previously reported that perinatal exposure to G, V, and the GV combination causes histological changes in the mammary gland during the peripubertal period, suggesting alterations to the peripubertal hormone response. We now investigate whether perinatal exposure to these compounds alters the gene expression profiles of the developing glands to identify the dysregulated signaling pathways and the underlying mechanisms. G, V, or GV (1 mg/kg body weight per day) was added to diet of Wistar rats, from conception to weaning; female offspring mammary glands were collected at postnatal days (PNDs) 35 and 50. Genes displaying differential expression and belonging to different functional categories were validated by quantitative PCR and immunocytochemistry. At PND35, G had little effect; the slight changes noted were in genes related to morphogenesis. The changes following exposure to V concerned the functional categories associated with development (Cldn1, Krt17, and Sprr1a), carbohydrate metabolism, and steroidogenesis. The GV mixture upregulated genes (Krt17, Pvalb, and Tnni2) involved in muscle development, indicating effects on myoepithelial cells during mammary gland morphogenesis. Importantly, at PND50, cycling females exposed to GV showed an increase in the expression of genes (Csn2, Wap, and Elf5) related to differentiation, consistent with the previously reported abnormal lobuloalveolar development previously described. Thus, perinatal exposure to GV alters the mammary gland hormone response differently at PND35 (puberty) and in animals with established cycles.
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Affiliation(s)
- H El Sheikh Saad
- INSERM U965, UFR Médecine, Hôpital Lariboisière; Université Paris 7, 41 Bd de la chapelle, F-75475 Paris Cedex 10, France Laboratoire d'Oncogénétique, Institut Curie Hôpital René Huguenin, St-Cloud F-92210, France
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23
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Schug T, Abagyan R, Blumberg B, Collins T, Crews D, DeFur P, Dickerson S, Edwards T, Gore A, Guillette L, Hayes T, Heindel J, Moores A, Patisaul H, Tal T, Thayer K, Vandenberg L, Warner J, Watson C, Saal FV, Zoeller R, O’Brien K, Myers J. Designing Endocrine Disruption Out of the Next Generation of Chemicals. GREEN CHEMISTRY : AN INTERNATIONAL JOURNAL AND GREEN CHEMISTRY RESOURCE : GC 2013; 15:181-198. [PMID: 25110461 PMCID: PMC4125359 DOI: 10.1039/c2gc35055f] [Citation(s) in RCA: 49] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
A central goal of green chemistry is to avoid hazard in the design of new chemicals. This objective is best achieved when information about a chemical's potential hazardous effects is obtained as early in the design process as feasible. Endocrine disruption is a type of hazard that to date has been inadequately addressed by both industrial and regulatory science. To aid chemists in avoiding this hazard, we propose an endocrine disruption testing protocol for use by chemists in the design of new chemicals. The Tiered Protocol for Endocrine Disruption (TiPED) has been created under the oversight of a scientific advisory committee composed of leading representatives from both green chemistry and the environmental health sciences. TiPED is conceived as a tool for new chemical design, thus it starts with a chemist theoretically at "the drawing board." It consists of five testing tiers ranging from broad in silico evaluation up through specific cell- and whole organism-based assays. To be effective at detecting endocrine disruption, a testing protocol must be able to measure potential hormone-like or hormone-inhibiting effects of chemicals, as well as the many possible interactions and signaling sequellae such chemicals may have with cell-based receptors. Accordingly, we have designed this protocol to broadly interrogate the endocrine system. The proposed protocol will not detect all possible mechanisms of endocrine disruption, because scientific understanding of these phenomena is advancing rapidly. To ensure that the protocol remains current, we have established a plan for incorporating new assays into the protocol as the science advances. In this paper we present the principles that should guide the science of testing new chemicals for endocrine disruption, as well as principles by which to evaluate individual assays for applicability, and laboratories for reliability. In a 'proof-of-principle' test, we ran 6 endocrine disrupting chemicals (EDCs) that act via different endocrinological mechanisms through the protocol using published literature. Each was identified as endocrine active by one or more tiers. We believe that this voluntary testing protocol will be a dynamic tool to facilitate efficient and early identification of potentially problematic chemicals, while ultimately reducing the risks to public health.
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Affiliation(s)
- T.T Schug
- Corresponding authors: T.T. Schug, . K.P. O’Brien, . J.P. Myers,
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - K.P. O’Brien
- Corresponding authors: T.T. Schug, . K.P. O’Brien, . J.P. Myers,
| | - J.P. Myers
- Corresponding authors: T.T. Schug, . K.P. O’Brien, . J.P. Myers,
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24
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Maranghi F, Mantovani A. Targeted toxicological testing to investigate the role of endocrine disrupters in puberty disorders. Reprod Toxicol 2012; 33:290-6. [DOI: 10.1016/j.reprotox.2012.01.009] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2011] [Revised: 12/22/2011] [Accepted: 01/31/2012] [Indexed: 01/08/2023]
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25
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Fenton SE, Reed C, Newbold RR. Perinatal environmental exposures affect mammary development, function, and cancer risk in adulthood. Annu Rev Pharmacol Toxicol 2011; 52:455-79. [PMID: 22017681 PMCID: PMC3477544 DOI: 10.1146/annurev-pharmtox-010611-134659] [Citation(s) in RCA: 57] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Puberty is an important transition that enables reproduction of mammalian species. Precocious puberty, specifically early thelarche (the appearance of breast "buds"), in girls of multiple ethnic backgrounds is a major health problem in the United States and other countries. The cause for a continued decrease in the age of breast development in girls is unknown, but environmental factors likely play a major role. Laboratory and epidemiological studies have identified several individual environmental factors that affect breast development, but further progress is needed. Current research needs include increased attention to and recording of prenatal and neonatal environmental exposures, testing of marketed chemicals for effects on the mammary gland, and understanding of the mammary gland-specific mechanisms that are altered by chemicals. Such research is required to halt the increasing trend toward puberty at earlier ages.
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Affiliation(s)
- Suzanne E. Fenton
- Division of the National Toxicology Program, National Institute of Environmental Health Sciences, National Institutes of Health, U.S. Department of Health and Human Services, Research Triangle Park, North Carolina 27709
| | - Casey Reed
- Division of the National Toxicology Program, National Institute of Environmental Health Sciences, National Institutes of Health, U.S. Department of Health and Human Services, Research Triangle Park, North Carolina 27709
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26
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Moral R, Santucci-Pereira J, Wang R, Russo IH, Lamartiniere CA, Russo J. In utero exposure to butyl benzyl phthalate induces modifications in the morphology and the gene expression profile of the mammary gland: an experimental study in rats. Environ Health 2011; 10:5. [PMID: 21241498 PMCID: PMC3033239 DOI: 10.1186/1476-069x-10-5] [Citation(s) in RCA: 43] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2010] [Accepted: 01/17/2011] [Indexed: 05/03/2023]
Abstract
BACKGROUND Environmental estrogens are exogenous estrogen-mimicking compounds that can interfere with endogenous endocrine systems. Several of these endocrine disruptors have been shown to alter normal development and influence tumorigenesis in experimental models. N-butyl benzyl phthalate (BBP), a widely used plasticizer, is a well-known endocrine disruptor. The aim of this study was to elucidate the effect of prenatal exposure to BBP on the morphology, proliferative index, and genomic signature of the rat mammary gland at different ages. METHODS In utero exposure was performed by gavage of pregnant Sprague Dawley CD rats with 120mg or 500mg BBP/kg/day from day 10 post-conception to delivery. Female litters were euthanized at 21, 35, 50 and 100 days. The morphology and proliferative index of the mammary gland were studied from whole mount preparations and BrdU incorporation, respectively. Gene expression profile was assessed by microarrays. Several genes found differentially expressed and related to different functional categories were further validated by real time RT-PCR. RESULTS Prenatal exposure of BBP induced delayed vaginal opening and changes in the post-natal mammary gland long after the end of the treatment, mainly by 35 days of age. Exposure to the high dose resulted in modifications in architecture and proliferative index of the mammary gland, mostly affecting the undifferentiated terminal end buds. Moreover, the expression profiles of this gland in the exposed rats were modified in a dose-dependent fashion. Analysis of functional categories showed that modified genes were related to immune function, cell signaling, proliferation and differentiation, or metabolism. CONCLUSIONS Our data suggest that in utero exposure to BBP induced a delayed pubertal onset and modified morphology of the mammary gland. These alterations were accompanied by modifications in gene expression previously associated with an increased susceptibility to carcinogenesis.
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Affiliation(s)
- Raquel Moral
- Breast Cancer Research Laboratory, Fox Chase Cancer Center, Philadelphia, PA 19111, USA
- Department of Cell Biology, Physiology and Immunology, Medicine School, Universitat Autònoma de Barcelona, Bellaterra, Barcelona, 08193, Spain
| | | | - Richard Wang
- Breast Cancer Research Laboratory, Fox Chase Cancer Center, Philadelphia, PA 19111, USA
| | - Irma H Russo
- Breast Cancer Research Laboratory, Fox Chase Cancer Center, Philadelphia, PA 19111, USA
| | - Coral A Lamartiniere
- Department of Pharmacology and Toxicology, University of Alabama at Birmingham, Birmingham, AL 35294, USA
| | - Jose Russo
- Breast Cancer Research Laboratory, Fox Chase Cancer Center, Philadelphia, PA 19111, USA
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Kim T, Park H, Yue W, Wang JP, Atkins KA, Zhang Z, Rogan EG, Cavalieri EL, Mohammad KS, Kim S, Santen RJ, Aiyar SE. Tetra-methoxystilbene modulates ductal growth of the developing murine mammary gland. Breast Cancer Res Treat 2010; 126:779-89. [PMID: 21170676 DOI: 10.1007/s10549-010-1301-5] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2010] [Accepted: 12/08/2010] [Indexed: 10/18/2022]
Abstract
Extensive data suggest that estradiol contributes to the development of breast cancer by acting as a mitogen and exerting direct genotoxic effects after enzymatic conversion to 4-hydroxyestradiol (4-OHE2) via cytochrome P450 1B1 (CYP1B1). The mammary gland, ovary, and uterus all express CYP1B1. Overexpression of this enzyme has been associated with an increased risk of breast cancer and blockade might reduce this carcinogenic effect. For this reason, we conducted systematic in vitro and in vivo studies of a CYP1B1 inhibitor, TMS (2,3',4,5'-tetramethoxystilbene). We found that TMS blocked the enzymatic conversion of radiolabeled estradiol to both 2-hydroxyestradiol (2-OHE2) and 4-OHE2, but did not inhibit Cyp1b1 message formation. In vivo studies using mass spectrometry showed that TMS inhibited formation of 2-OHE2 and 4-OHE2 and the resulting estrogen-DNA adducts. To examine its biologic actions in vivo, we investigated whether TMS could block the hyperplastic changes that occur in the developing breast of aromatase-transfected mice. We found that TMS induced a significant reduction of ductal structures in mice less than 6 months in age. In older mice, no reduction in breast morphology occurred. These latter studies uncovered unexpected estrogen agonistic actions of TMS at high doses, including a paradoxical stimulation of breast ductal structures and the endometrium. These studies suggest that the enzyme inhibitory properties of TMS, as well as the effects on developing breast, could implicate a role for TMS in breast cancer prevention, but only in low doses and on developing breast.
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Affiliation(s)
- Taehyun Kim
- Division of Endocrinology and Metabolism, Department of Internal Medicine, University of Virginia School of Medicine, Charlottesville, VA 22908, USA
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28
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Chatterjee S, Karlovsky P. Removal of the endocrine disrupter butyl benzyl phthalate from the environment. Appl Microbiol Biotechnol 2010; 87:61-73. [PMID: 20396882 PMCID: PMC2872021 DOI: 10.1007/s00253-010-2570-y] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2010] [Revised: 03/16/2010] [Accepted: 03/17/2010] [Indexed: 11/30/2022]
Abstract
Butyl benzyl phthalate (BBP), an aryl alkyl ester of 1,2-benzene dicarboxylic acid, is extensively used in vinyl tiles and as a plasticizer in PVC in many commonly used products. BBP, which readily leaches from these products, is one of the most important environmental contaminants, and the increased awareness of its adverse effects on human health has led to a dramatic increase in research aimed at removing BBP from the environment via bioremediation. This review highlights recent progress in the degradation of BBP by pure and mixed bacterial cultures, fungi, and in sludge, sediment, and wastewater. Sonochemical degradation, a unique abiotic remediation technique, and photocatalytic degradation are also discussed. The degradation pathways for BBP are described, and future research directions are considered.
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Affiliation(s)
- Subhankar Chatterjee
- Molecular Phytopathology and Mycotoxin Research Unit, University of Goettingen, Grisebachstrasse 6, 37077 Goettingen, Germany.
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29
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Sumner S, Snyder R, Burgess J, Myers C, Tyl R, Sloan C, Fennell T. Metabolomics in the assessment of chemical-induced reproductive and developmental outcomes using non-invasive biological fluids: application to the study of butylbenzyl phthalate. J Appl Toxicol 2010; 29:703-14. [PMID: 19731247 DOI: 10.1002/jat.1462] [Citation(s) in RCA: 38] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
This study was conducted to evaluate the use of metabolomics for improving our ability to draw correlations between early life exposures and reproductive and/or developmental outcomes. Pregnant CD rats were exposed by gavage daily during gestation to vehicle or to butylbenzyl phthalate (BBP) in vehicle at a level known to induce effects in the offspring and at a level previously not shown to induce effects. Urine was collected for 24 h (on dry ice using all glass metabolism chambers) from dams on gestational day 18 (during exposure) and on post natal day (pnd) 21, and from pnd 25 pups. Traditional phenotypic anchors were measured in pups (between pnd 0 and pnd 26). Metabolomics of urine collected from dams exposed to vehicle or BBP exhibited different patterns for endogenous metabolites. Even three weeks after gestational exposure, metabolic profiles of endogenous compounds in urine could differentiate dams that received the vehicle, low dose or high dose of BBP. Metabolic profiles could differentiate male from female pups, pups born to dams receiving the vehicle, low or high BBP dose, and pups with observable adverse reproductive effects from pups with no observed effects. Metabolites significant to the separation of dose groups and their relationship with effects measured in the study were mapped to biochemical pathways for determining mechanistic relevance. The application of metabolomics to understanding the mechanistic link between low levels of environmental exposure and disease/dysfunction holds huge promise, because this technology is ideal for the analysis of biological fluids in human populations.
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Affiliation(s)
- Susan Sumner
- Health Sciences, RTI International, 3040 Cornwallis Drive, Research Triangle Park, NC 27709, USA.
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30
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Wuttke W, Jarry H, Seidlova-Wuttke D. Definition, classification and mechanism of action of endocrine disrupting chemicals. Hormones (Athens) 2010; 9:9-15. [PMID: 20363717 DOI: 10.1007/bf03401276] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Wolfgang Wuttke
- Department of Endocrinology, University Medical Center Goettingen, Georg-August-University, Germany.
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