Overview of EPA’s Research Program for Endocrine Disruptors

Overview of EPA’s Research Program for Endocrine Disruptors Elaine Z. Francis, Ph.D. National Program Director for ORD’s Endocrine Disruptors Research Program Endocrine Disruptors Methods Validation Subcommittee October 30, 2001 Outline  Background   EPA‟s Office of Research and Development Why ORD is studying EDCs Better understanding of science Determining the extent of the problem Supporting EPA‟s screening & testing program  Research     Coordination of Activities  EPA‟s leadership role on endocrine disruptors  Summary Background Office of Research and Development…  …is the research arm of the Agency Provide the scientific foundation to support EPA’s mission by:  Conducting research and development to identify, understand, and solve current and future environmental problems Providing independently peer reviewed research results and assessments that foster the sound use of science and technology in Agency decisions. Providing responsive technical support to EPA‟s Programs and Regions    Collaborating with our scientific partners in academia and other agencies, state and tribal governments, private sector organizations, and nations  Exercising leadership in addressing emerging environmental issues and advancing the science and technology of risk assessment and risk management ORD Locations Newport, OR Corvallis, OR Duluth, MN 3 National Laboratories 2 National Centers 2 Offices 13 Locations Grosse l le, MI Cincinnati, OH Narragansett, RI Edison, NJ Washington, DC Research Triangle Park, NC Las Vegas, NV Ada, OK Gulf Breeze, FL Athens, GA High Priority Research Areas • Particulate Matter • Drinking Water • Clean Water • Global Change • Ecological Risks • Human Health Risks (including Children’s Health Risks) • Endocrine Disruptors • Pollution Prevention and New Technologies Why is EPA studying EDCs?    Evidence suggests that environmental exposure to manmade chemicals that mimic hormones (endocrine disruptors) may cause adverse health effects in human and wildlife populations Chemicals of concern (i.e., pesticides, industrial) are EPA‟s responsibility (e.g., TSCA, FIFRA, FQPA) Many uncertainties in our knowledge of endocrine disruptors  nature of effects (e.g., developmental/reproductive, cancer, neurobehavioral)   extent of the problem (e.g., declining wildlife populations) dose-response relationships (e.g., which chemicals, what levels of exposure, shape of dose-response curve) Blueprint for Research ORD’s Research Plan      One of ORD‟s highest risk-based priorities Identified EDCs as emerging public health and environmental issue (1994) Organized and hosted two international research needs workshops (1995) Published interim guidance document (1997) Published peer-reviewed research plan (1998) (www.epa.gov/ORD/WebPubs/final)  Developed Multi-Year Plan (2001) Multi-Year Plan: Long-Term Goals    Provide a better understanding of the science underlying the effects, exposure, assessment, and management of endocrine disruptors Determine the extent of the impact of endocrine disruptors on humans, wildlife, and the environment Support EPA‟s screening and testing program Key Research Questions Aligned under Long Term Goals  Better understanding of science –  Determining the extent of the problem – What are the dose-response relationships? Needed extrapolation tools? Effects of multiple EDCs? Management of unreasonable risks? Risk assessment approaches?  What effects are occurring in human & wildlife populations? Exposure determinations? What chemical classes are responsible? Major sources and fates? – – – – – – – Supporting EPA‟s screening & testing program – Adequacy of testing guidelines? Linkage and Timeline for APGs to Meet Long Term Goal 1 FY01 FY02 FY03 FY04 FY05 FY06 FY07 Evaluate exposure methods, measurement protocols, and models for the assessment of risk management efficacy on EDCs Develop new risk management tools Determine critical biological factors during development resulting in toxicities later in life Evaluate existing risk management tools to reduce exposure to EDCs Characterize the effects of exposure to multiple EDCs, in various combination such as those with similar and different mechanisms of action Identify risk management EDCs research Shading denotes APG appears in multiple LTGs Identify key risk assessment issues and develop guidance for assessing endocrine disruptors Determine the shape of the doseresponse curve in a variety of species exposed to ambient levels of EDCs Determine degree to which effects of EDCs with defined mechanisms/m odes of action can be extrapolated across classes of vertebrates Provide a Better Understanding of Science Underlying the Effects, Exposure, Assessment, and Management of Endocrine Disruptors Linkage and Timeline for APGs to Meet Long Term Goal 1 FY01 FY02 FY03 FY04 FY05 FY06 FY07 Evaluate exposure Determine methods, critical biological measurement protocols, and factors during models for the development resulting in assessment of APM :Determination of the mechanism(s) by whichlater risk toxicities developmental exposure to PCBs disrupts thyroid hormones to produce ototoxicity, management in life Evaluate existing Identify risk risk management of the effects of exposure to mixtures of PHAHs and management efficacy on characterization tools to reduce of whether non-AH receptor mechanisms underlie the EDCs research EDCs determination exposure to EDCs Develop new risk management tools Shading denotes APG appears in multiple LTGs Characterize the effects of exposure to multiple EDCs, in various combination such as those with similar and different mechanisms of action neurotoxicity of some PHAHs. 2001 NHEERL APM: Effects of early developmental exposure to endocrine disrupting pesticides on reproductive function in adults 2002 NCER Determine degree to APM: Lab and field analysis of mechanisms by which tributyltin, alone and which effects in combination with 3 methylcholanthrene, causes pseudohermaphroditism with of EDCs in marine gastropods 2003 NCER defined Determine the mechanisms/m shape of of mixtures of endocrine disruptors on APM: Examination of the effectsthe doseIdentify key risk response curve in odes health endpoints 2003 NHEERL of action assessment issues and develop guidance for assessing endocrine disruptors a variety of species exposed to ambient levels of EDCs can be extrapolated across classes of vertebrates Provide a Better Understanding of Science Underlying the Effects, Exposure, Assessment, and Management of Endocrine Disruptors Linkage and Timeline for APGs to Meet Long Term Goal 2 FY01 FY02 Develop field methods to assess environmental exposures in tissues and environmental compartments FY03 FY04 FY05 FY06 FY07 Determine sources of exposure and environmental fates of EDCs Develop multimedia exposure models Determine efficacy of wildlife species as sentinels Evaluate several classes of chemicals suspected of being EDCs in field studies & ascertain degree to which they adversely affect wildlife at the population level Determine critical biological factors during development resulting in toxicities later in life Determine extent to which exposure to EDCs contribute to onset or increase in severity of diseases Shading denotes APG appears in multiple LTGs Evaluate several classes of chemicals suspected of being EDCs & determine potencies in laboratory studies Determine whether adverse developmental/reproductive effects are occurring in human populations Determine the Extent of the Impact of Endocrine Disruptors on Humans, Wildlife, and the Environment Linkage and Timeline for APGs to Meet Long Term Goal 3 FY01 FY02 FY03 FY04 FY05 FY06 FY07 Evaluate existing testing guidelines for their adequacy to evaluate endocrinemediated effects Develop standardized protocols for screening chemicals for their potential endocrinemediated effects to meet FQPA requirements Identify key risk assessment issues and develop guidance for assessing endocrine disruptors Develop standardized protocols for testing chemicals for their potential endocrinemediated effects to meet FQPA requirements Support EPA’s Screening and Testing Program Shading denotes APG appears in multiple LTGs Intramural Research: Effects Research: LTGs 1, 2, & 3        Evaluates adequacy of current testing guidelines Develops new/improved protocols for screening and testing program Determines classes of chemicals that act as EDCs and their potencies Determines the dose-response curves for EDCs at environmentally relevant concentrations Investigates mode of action of certain EDCs Conducts comparative endocrinology studies Examines population level effects Research to Support EDSP           Receptor binding/transcriptional activation assays (in vitro screens) Tissue slice assay (in vitro screen) Hershberger assay (in vivo screen) Female pubertal assay in rats (in vivo screen) Male pubertal assay in rats (in vivo screen) Developmental toxicity screen in rats (in vivo alternative screen) Frog metamorphosis assay (in vivo screen) Fish 21-day reproduction screen in the fathead minnow (in vivo screen) Two generation mammalian reproduction study (in vivo test) Invertebrate reproduction assay (in vivo test) Exposure Research: LTGs 1 & 2   Identifies and improves understanding of major exposure routes and processes Develops predictive models estimating the extent and magnitude of exposures  Humans and ecosystems Risk Assessment Research: LTGs 1, 2 & 3   Developing position paper on how results from EDSP could be incorporated into hazard characterization assessments Developing case study for methods on integrating human health and ecological EDC data into risk assessments Risk Management Research: LTGs 1 & 2  Identifying major sources of EDCs entering the environment, with focus on:      contaminated sediments wastewater treatment plants confined animal feeding operations sources of combustion drinking water treatment plants  Developing tools for risk management of EDCs, such as biodegradation processes or pollution prevention strategies Extramural ResearchScience to Achieve Results (STAR): LTGs 1, 2 & 3 History of Extramural Program  Supported through STAR Program since „96   EPA-only RFAs in 1996 and 1997 Multi-Agency participation in 1998/99 and 2000 e.g., EU, American Chemistry Council  Exploring broader partnerships   Current portfolio includes 32 grants and 1 fellowship (www.epa.gov/ncerqa)     Broad array of topics, species, chemicals Support approximately $17.5 M total Additional $10 M in awards pending decisions Grants awarded by other research programs - 18 ($4.6 M)  2002 RFA on Exposure Issues  ‘00 Multi-Agency RFA (EPA, NIEHS, NIOSH, NCI) Investigate the relationship between exposure to endocrine disruptors and reproductive/developmental effects in humans     Working population or general population Study design should clearly differentiate exposure categories Quantitative relationships between chemical exposure and adverse reproductive effects in humans Effects of interest:  Reduced fertility or other altered reproductive function  Pregnancy outcomes  Latent effects on reproduction among offspring exposed in utero  Hormonally mediated cancers of reproductive tract among offspring exposed in utero Extramural Program: Chemicals Under Study Alkylphenols Hormones Metals Dioxins/PCBs Pesticides Phenols Phthalates Phytoestrogens Organochlorines Other Not Specified 10 5 4 0 2 24 4 7 16 8 3 Total: 83 Japanese quail Waterflea Mudsnail Grass shrimp Amphipod Zebra finch Chicken Gull Non-specified Rat Nude mouse ER knockout mouse Mouse, non-specified Zebra fish Medaka Dogfish shark Mosquitofish Bonnet head shark Rabbit Rhesus monkey Copepod Atlantic Croaker Non-specified Xenopus Rana Non-specified Morelet’s crocodile Human Alligator Coordination of Activities Across Federal Agencies  CENR Endocrine Disruptors Working Group - convened since 1995 (www.epa.gov/endocrine)       EPA, Chair; NIEHS/DOI, Vice Chairs Representation: 14 federal agencies Research needs document Inventory of federal research Established national priorities Co-sponsored two multi-agency requests for applications (RFAs) for extramural grants Internationally   G-8 Environmental Ministers Meeting IPCS/WHO/OECD Steering Committee (ORD chairs)   Developed Global Endocrine Disruptors Research Inventory Developing a “Global State of the Science” report (2002)  US-EU Joint Collaborations   Meetings in Ispra, Italy (1999) and Sweden (2001)- identified research recommendations & forge collaborations Discussions on linking solicitations for research proposals Research Workshops  Collaborations with Japan    OECD Highlights and Summary Highlights of Research Results and Their Impacts    Results of studies on atrazine, a commonly used herbicide, and vinclozolin, a fungicide, were critical to improving the Agency‟s risk assessments and setting tolerances Pioneering research on antiandrogenic effects of some environmental chemicals (e.g., DDE) Exposure to high levels of PBBs prenatally and via breast milk may impact puberty in girls Highlights of Research Results and Their Impacts (cont‟d)   Products from research supporting Agency‟s needs for S&T methods - e.g., improved QSAR approaches, support documents for male and female pubertal assays, method to assess effects in invertebrates, and evaluation of suitability of frog metamorphosis assay Discovery of a new (third) estrogen receptor in vertebrates and demonstration that estrogens and xenoestrogens can act on cells at the membrane level which helps improve the understanding of how EDCs elicit responses Highlights of Research Results and Their Impacts (cont‟d)    Identification of androgenic compounds in paper mill effluent, using a screening assay in fish Developed methods for collecting samples - soil, sediment, wastewater, water, terrestrial and aquatic biota Developed analytic methods for some EDCs Future Research, Outcomes, and Impacts    Development of new assays for the Agency‟s S&T program Determining the magnitude of adverse impacts of EDCs on human health Estimation of the impacts at the population level from exposures to EDCs in representative wildlife species Future Research, Outcomes, and Impacts  (cont‟d)  Characterization of the effects of exposure to EDCs during adolescence in non-human primates Development of approaches for reducing exposures to EDCs from contaminated sediment, wastewater treatment outfalls, confined animal feeding operations, and combustion sources Future Research, Outcomes, and Impacts  (cont‟d)  Development of improved methods and models for exposure assessments Development of improved approaches for integrated risk assessments      Incorporating mechanisms of action Understanding shape of the dose-response curve Integrating human health and ecological data Taking into consideration risks to susceptible populations, especially children Aggregate exposure and cumulative risk determinations Future Directions     Nature of EDCs issue is so broad and complex it necessitates continued coordinated efforts through intramural and extramural programs and nationally and internationally  e.g., joint or coordinated solicitations for grants Determine best way to communicate research results  e.g., State of the Science Reports, integrated website External peer review of the Multi-Year Plan Grantees Workshop in 2002 Summary     There is global concern regarding exposures to some environmental agents that interfere with endocrine systems EPA continues to lead national and international efforts to coordinate EDCs research programs EPA‟s research is providing immediate results for implementing the screening and testing program mandated by FQPA and SDWAA EPA‟s long-term research program on EDCs focuses on the most critical uncertainties in determining whether humans and wildlife populations are being impacted by levels of EDCs in the environment, in identifying the sources of those exposures, and approaches to reduce/prevent them