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- W2117455783 abstract "The 2007 Summit on Environmental Challenges to Reproductive Health and Fertility convened scientists, health care professionals, community groups, political representatives, and the media to hear presentations on the impact of environmental contaminants on reproductive health and fertility, and to discuss opportunities to improve health through research, education, communication, and policy. Environmental reproductive health focuses on exposures to environmental contaminants, particularly during critical periods of development, and their potential effects on future reproductive health, including conception, fertility, pregnancy, adolescent development, and adult health. Approximately 87,000 chemical substances are registered for commercial use in the United States, with ubiquitous human exposures to environmental contaminants in air, water, food, and consumer products. Exposures during critical windows of susceptibility may result in adverse effects with lifelong and even intergenerational health impacts. Effects can include impaired development and function of the reproductive tract and permanently altered gene expression, leading to metabolic and hormonal disorders, reduced fertility and fecundity, and illnesses such as testicular, prostate, uterine, and cervical cancers later in life. This executive summary reviews effects of pre- and postnatal exposures on male and female reproductive health, and provides a series of recommendations for advancing the field in the areas of research, policy, health care, and community action. The 2007 Summit on Environmental Challenges to Reproductive Health and Fertility convened scientists, health care professionals, community groups, political representatives, and the media to hear presentations on the impact of environmental contaminants on reproductive health and fertility, and to discuss opportunities to improve health through research, education, communication, and policy. Environmental reproductive health focuses on exposures to environmental contaminants, particularly during critical periods of development, and their potential effects on future reproductive health, including conception, fertility, pregnancy, adolescent development, and adult health. Approximately 87,000 chemical substances are registered for commercial use in the United States, with ubiquitous human exposures to environmental contaminants in air, water, food, and consumer products. Exposures during critical windows of susceptibility may result in adverse effects with lifelong and even intergenerational health impacts. Effects can include impaired development and function of the reproductive tract and permanently altered gene expression, leading to metabolic and hormonal disorders, reduced fertility and fecundity, and illnesses such as testicular, prostate, uterine, and cervical cancers later in life. This executive summary reviews effects of pre- and postnatal exposures on male and female reproductive health, and provides a series of recommendations for advancing the field in the areas of research, policy, health care, and community action. On January 28–30, 2007, the Summit on Environmental Challenges to Reproductive Health and Fertility was convened at the Mission Bay Campus of the University of California, San Francisco (UCSF). The Summit was the product of a collaboration between the UCSF Program on Reproductive Health and the Environment in the Department of Obstetrics, Gynecology and Reproductive Sciences, the UCSF National Center of Excellence in Women's Health, and the Collaborative on Health and the Environment. This unique gathering coalesced the field of environmental reproductive health by bringing together over 400 scientists, researchers, health care professionals, trainees, health-affected groups, community and political representatives, and the media to discuss what is currently known about the impacts of environmental contaminants on reproductive health and fertility. The compelling nature of the collective science, with observations in humans, animal models, and wildlife, raised concern for the future health of individuals and families. The Summit also set the stage to improve health through research, education, communication, and changes in public health policy. This executive summary presents the highlights from the accompanying Supplement on Environmental Challenges to Reproductive Health and the Environment (1Proceedings of the UCSF-CHE Summit on Environmental Challenges to Reproductive Health and Fertility.Fertil Steril. 2008; 89 (Available online at)http://www.fertstert.orgGoogle Scholar), which summarizes the state of the science presented at the Summit, and outlines the key “next steps” Summit participants recommended for research, policy, health care, community action, and safe work.Defining the fieldEnvironmental reproductive health focuses on exposures to environmental contaminants (synthetic chemicals and metals), particularly during critical periods of development (such as before conception and during pregnancy), and their potential effects on all aspects of future reproductive health throughout the life course, including conception, fertility, pregnancy, child and adolescent development, and adult health (Fig. 1).Environmental contaminantsSince World War II, there has been a dramatic increase in human exposures to both natural and synthetic chemicals. As of 2006, there are approximately 87,000 chemical substances registered for commerce in the United States (US) (2US EPAWhat is the TSCA Chemical Substance Inventory. Vol. 2007. US Environmental Protection Agency, Washington, DC2006Google Scholar). Common environmental pollutants include pesticides and herbicides such as atrazine and chlorpyrifos; volatile organic compounds such as benzene, toluene, and chloroform; heavy metals such as lead, mercury, and arsenic; air contaminants such as carbon monoxide, ozone, particulate matter, and environmental tobacco smoke (ETS); and persistent organic pollutants, such as the dioxins, polychlorinated biphenols (PCBs), the pesticide dichlorodiphenyltrichloroethane (DDT), and its breakdown product dichlorodiphenyldichloroethylene (DDE).Although many environmental contaminants can affect reproductive health (Table 1), there is an important class of chemicals called endocrine disrupting chemicals (EDCs) that interfere with the production, release, transport, metabolism, binding, action, or elimination of natural hormones in the body that are responsible for the maintenance of homeostasis and the regulation of developmental processes. Some of the common EDCs discussed at the Summit include bisphenol A (BPA), phthalates, and certain pesticides (e.g., vinclozolin, dicofol, atrazine). Many of these compounds alter estrogen, androgen, and thyroid signaling, which are essential for normal embryonic development and reproductive activity in all vertebrates studied to date (3McLachlan J.A. Environmental signaling: what embryos and evolution teach us about endocrine disrupting chemicals.Endocr Rev. 2001; 22: 319-341Crossref PubMed Scopus (328) Google Scholar, 4Zoeller R.T. Dowling A.L.S. Herzig C.T.A. Iannacone E.A. Gauger K.J. Bansal R. Thyroid hormone, brain development, and the environment.Environ Health Perspect. 2002; 110: 355-361Crossref PubMed Google Scholar, 5Gray LE Jr, Wilson VS, Stoker T, Lambright C, Furr J, Noriega N, et al. Adverse effects of environmental antiandrogens and androgens on reproductive development in mammals. Int J Androl 29:96–104.Google Scholar). They can also alter hormone synthesis, storage on plasma proteins, and hepatic biotransformation and clearance (6Guillette Jr., L.J. Gunderson M.P. Alterations in the development of the reproductive and endocrine systems of wildlife exposed to endocrine disrupting contaminants.Reproduction. 2001; 122: 857-864Crossref PubMed Google Scholar); disrupt neural and immune signaling pathways (7Fournier M. Brousseau P. Tryphonas H. Cyr D. Biomarkers of immunotoxicity: an evolutionary perspective.in: Guillette Jr., L.J. Crain D.A. Endocrine disrupting contaminants: an evolutionary perspective. Francis and Taylor Inc., Philadelphia, PA2000: 182-215Google Scholar, 8Guillette Jr., L.J. Endocrine disrupting contaminants—beyond the dogma.Environ Health Perspect. 2006; 114: 9-12PubMed Google Scholar, 9Osteen K.G. Sierra-Rivera E. Does disruption of immune and endocrine systems by environmental toxins contribute to development of endometriosis?.Semin Reprod Endocrinol. 1997; 15: 301-308Crossref PubMed Google Scholar); and alter the regulation of gene expression (e.g., DNA methylation, RNA stability, protein degradation) [reviewed by (10Edwards T.M. Myers J.P. Environmental exposures and gene regulation in disease etiology.Environ Health Perspect. 2007; 115: 1264-1270Crossref PubMed Scopus (96) Google Scholar)]. In some cases, altered DNA methylation patterns have been shown to be heritable (11Anway M.D. Cupp A.S. Uzumcu M. Skinner M.K. Epigenetic transgenerational actions of endocrine disruptors and mate fertility.Science. 2005; 308: 1466-1469Crossref PubMed Scopus (763) Google Scholar, 12Crews D. Gore A.C. Hsu T.S. Dangleben N.L. Spinetta M. Schallert T. et al.Transgenerational epigenetic imprints on mate preference.Proc Nat Acad Sci USA. 2007; 104: 5942-5946Crossref PubMed Scopus (138) Google Scholar).Table 1Environmental contaminants: sources and selected health effects from developmental and adult exposures (animal and human data). (Adapted from Challenged Conceptions, Collaborative on Health and the Environment, 2005 254CHE. CHE Toxicant and Disease Database. Collaborative on Health and the Environment. Available at: http://database.healthhandenvironment.org. Accessed 16 October 2007.Google Scholar).ContaminantSourcesExamples of health effects associated with exposure during adulthoodExamples of health effects associated with exposure during developmentAir PollutionCommon air pollutants include carbon monoxide, lead, ground-level ozone, particulate matter, nitrogen dioxide, and sulfur dioxide. Air pollution arises from a variety of sources, including motor vehicles, industrial production, energy (coal) production, wood burning, and small local sources such as dry cleaners.fetal lossdMalformations of the reproductive tract: in males, could include shortened ano-genital distance in animals or hypospadias (humans), undescended testicles (cryptor-chidism), small testicles (hypoplasia), and structural abnormalities of the epididymis. In females, could include small ovaries, reduced number of follicles (eggs), and structural abnormalities of the oviducts, uterus, cervix, and/or vagina. 254CHE. CHE Toxicant and Disease Database. Collaborative on Health and the Environment. Available at: http://database.healthhandenvironment.org. Accessed 16 October 2007.Google Scholarlow birth weight 254CHE. CHE Toxicant and Disease Database. Collaborative on Health and the Environment. Available at: http://database.healthhandenvironment.org. Accessed 16 October 2007.Google Scholarpreterm delivery 254CHE. CHE Toxicant and Disease Database. Collaborative on Health and the Environment. Available at: http://database.healthhandenvironment.org. Accessed 16 October 2007.Google ScholarBisphenol A (BPA)Industrial chemical and building block for polycarbonate plastic and epoxy resins. Found in the lining of metal food and drink cans, plastic baby bottles, pacifiers and baby toys, dental sealants, computers, cell phones, hard plastic water bottles, paints, adhesives, enamels, varnishes, CDs and DVDs, and certain microwavable or reusable food and drink containers.oocyte chromosome abnomalities 162Hunt P.A. Koehler K.E. Susiarjo M. Hodges C.A. Ilagan A. Voigt R.C. et al.Bisphenol a exposure causes meiotic aneuploidy in the female mouse.Curr Biol. 2003; 13: 546-553Abstract Full Text Full Text PDF PubMed Scopus (237) Google Scholarrecurrent miscarriage 160Sugiura-Ogasawara M. Ozaki Y. Sonta S. Makino T. Suzumori K. Exposure to bisphenol A is associated with recurrent miscarriage.Hum Reprod. 2005; 20: 2325-2329Crossref PubMed Scopus (125) Google Scholardecreased semen quality 180Al-Hiyasat A.S. Darmani H. Elbetieha A.M. Effects of bisphenol A on adult male mouse fertility.Eur J Oral Sci. 2002; 110: 163-167Crossref PubMed Google Scholar, 181Sakaue M. Ohsako S. Ishimura R. Kurosawa S. Kurohmaru M. Hayashi Y. et al.Bisphenol-A affects spermatogenesis in the adult rat even at a low dose.J Occup Health. 2001; 43: 185-190Crossref Google Scholaraltered puberty onset 182Howdeshell K.L. Hotchkiss A.K. Thayer K.A. Vandenbergh J.G. vom Saal F.S. Exposure to bisphenol A advances puberty.Nature. 1999; 401: 763-764Crossref PubMed Scopus (430) Google Scholarobesity 182Howdeshell K.L. Hotchkiss A.K. Thayer K.A. Vandenbergh J.G. vom Saal F.S. Exposure to bisphenol A advances puberty.Nature. 1999; 401: 763-764Crossref PubMed Scopus (430) Google Scholaraltered prostate development 183Timms B.G. Howdeshell K.L. Barton L. Bradley S. Richter C.A. vom Saal F.S. Estrogenic chemicals in plastic and oral contraceptives disrupt development of the fetal mouse prostate and urethra.Proc Natl Acad Sci USA. 2005; 102: 7014-7019Crossref PubMed Scopus (154) Google Scholar, 184Gupta C. Reproductive malformation of the male offspring following maternal exposure to estrogenic chemicals.Proc Soc Exp Biol Med. 2000; 224: 61-68Crossref PubMed Scopus (184) Google Scholardecreased semen quality 181Sakaue M. Ohsako S. Ishimura R. Kurosawa S. Kurohmaru M. Hayashi Y. et al.Bisphenol-A affects spermatogenesis in the adult rat even at a low dose.J Occup Health. 2001; 43: 185-190Crossref Google Scholar, 185Herath C.B. Jin W. Watanabe G. Arai K. Suzuki A.K. Taya K. Adverse effects of environmental toxicants, octylphenol and bisphenol A, on male reproductive functions in pubertal rats.Endocrine. 2004; 25: 163-172Crossref PubMed Scopus (37) Google Scholarhormonal changes 185Herath C.B. Jin W. Watanabe G. Arai K. 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Updated weight of evidence for an association between adverse reproductive and developmental effects and exposure to disinfection by-products.Regul Toxicol Pharmacol. 2006; 45: 185-205Crossref PubMed Scopus (47) Google ScholarEthylene oxideChemical sterilant used in dental and medical practices.fetal lossdMalformations of the reproductive tract: in males, could include shortened ano-genital distance in animals or hypospadias (humans), undescended testicles (cryptor-chidism), small testicles (hypoplasia), and structural abnormalities of the epididymis. In females, could include small ovaries, reduced number of follicles (eggs), and structural abnormalities of the oviducts, uterus, cervix, and/or vagina. 187Sharara F.I. Seifer D.B. Flaws J.A. Environmental toxicants and female reproduction.Fertil Steril. 1998; 70: 613-622Abstract Full Text Full Text PDF PubMed Scopus (135) Google Scholar, 188Hruska K.S. Furth P.A. Seifer D.B. Sharara F.I. Flaws J.A. Environmental factors in infertility.Clin Obstet Gynecol. 2000; 43: 821-829Crossref PubMed Scopus (37) Google Scholardecreased semen qualityaDecreased semen quality could include low semen, abnormal sperm shapes or motility, decreased sperm counts. 188Hruska K.S. Furth P.A. Seifer D.B. Sharara F.I. Flaws J.A. Environmental factors in infertility.Clin Obstet Gynecol. 2000; 43: 821-829Crossref PubMed Scopus (37) Google Scholarmiscarriage in female partner 188Hruska K.S. Furth P.A. Seifer D.B. Sharara F.I. Flaws J.A. Environmental factors in infertility.Clin Obstet Gynecol. 2000; 43: 821-829Crossref PubMed Scopus (37) Google ScholarGlycol ethersUsed in paints, varnishes, thinners, printing inks, electronics, semi-conductor industry, leather, photographic film, varnish, enamels, cosmetics, perfumes, brake fluids, wood stains.longer menstrual cycles 135Hsieh G.Y. Wang J.D. Cheng T.J. Chen P.C. Prolonged menstrual cycles in female workers exposed to ethylene glycol ethers in the semiconductor manufacturing industry.Occup Environ Med. 2005; 62: 510-516Crossref PubMed Scopus (18) Google Scholardecreased semen qualityaDecreased semen quality could include low semen, abnormal sperm shapes or motility, decreased sperm counts. 100Figa-Talamanca I. Traina M.E. Urbani E. Occupational exposures to metals, solvents and pesticides: recent evidence on male reproductive effects and biological markers.Occup Med (Lond). 2001; 51: 174-188Crossref PubMed Scopus (62) Google Scholar, 189LaDou J. Occupational and environmental medicine. 3rd ed. Lange Medical/McGraw Hill, Stamford, CT2004Google Scholarreduced fertilitybReduced fertility could include both infertility and increased time to pregnancy (reduced fecundity). 190Correa A. Gray R.H. Cohen R. Rothman N. Shah F. 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- W2117455783 title "Proceedings of the Summit on Environmental Challenges to Reproductive Health and Fertility: executive summary" @default.
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