Endocrine Disrupting Chemicals A Cause For Concern?
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Transcript of Endocrine Disrupting Chemicals A Cause For Concern?
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Endocrine Endocrine Disrupting Disrupting ChemicalsChemicals
A Cause For Concern?A Cause For Concern?
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Endocrine Disrupting Chemicals
Endocrine Disruptors
Chemicals that mimic/antagonize normal hormones and can have permanent effects in organisms as well as progeny
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Types of EDCs
Natural•Phytoestrogens•Fungal estrogens
Synthetic •Hormones•Some pesticides•Industrial by-products•Plastic components •Some persistent organic pollutants (POPs)
FAO
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“What – me worry?”
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0 10 20 30 40 50 60 70 80 90 100
Percentage Tested
Acute Toxicity
Environmental Fate
Ecotoxicity
Mutagenicity
Chronic Toxicity
ReproductiveToxicity
Full Set of BasicToxicity Tests
7% Full* Set of Basic Toxicity Tests:
* Doesn’t Include Tests of Neurodevelopmental Effects
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6500 BC. - Lead discovered in Turkey, first mine
500 BC-300 AD.- Roman lead smelting produces dangerous emissions
100 BC. - Greek physicians give clinical description of lead poisoning
Lead - A Cautionary Tale
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"Lead makes the mind give way."
GreekDioscerides - 2nd BC
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Lead In Homes
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Lead in Families
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FEAFEARR
TRUTHTRUTH
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EVIDENCE?EVIDENCE?
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Endocrine Disrupting Chemicals
OverviewOverview
MechanismsMechanisms
Windows of SusceptibilityWindows of Susceptibility
What To Do About EDC’sWhat To Do About EDC’s
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Genital Anomalies – Human EpidemiologyGenital Anomalies – Human Epidemiology
0
1
2
3
4
5
6
7
8
9
1988199219962000
per1,000livebornmales
Nelson et al, AAP 2005Nelson et al, AAP 2005
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Testicular Cancer
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Testicular Dysgenesis Syndrome
Environmental Factors(including Endocrine disrupters)
Testicular Dysgenesis
Disturbed SertoliCell Function
Decreased LeydigCell Function
AndrogenInsufficiency
Hypospadias
Cryptorchidism
CIS
Reduced Semen Quality
Testicular Cancer
Impaired GermCell Differentiation
From Skakkebæk et al.
Genetic Defects
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Unlinking Thelarche from Unlinking Thelarche from MenarcheMenarche
Precocious Puberty?Precocious Puberty?
Increased Risk for Breast Increased Risk for Breast Cancer?Cancer?
Pubertal DevelopmentPubertal Development
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POLLUTIONPOLLUTION
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ToxicologyToxicology Synthesis of DisciplinesSynthesis of Disciplines
Evolved from the Ancient Evolved from the Ancient PoisonersPoisoners
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Selective Selective ToxicologyToxicology
PesticidesPesticides
HerbicidesHerbicides
AntibioticsAntibiotics
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PBDEs in House Dust (ppb)PBDEs in House Dust (ppb)
From EWG - Toxic Fire Retardants Contaminate American Homes - http://www.ewg.org/reports/inthedust/summary.phpFrom EWG - Toxic Fire Retardants Contaminate American Homes - http://www.ewg.org/reports/inthedust/summary.php
External ExposureExternal Exposure
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PBDEs in Breast Milk (ppb)PBDEs in Breast Milk (ppb)
From EWG - Toxic Fire Retardants in Breast Milk from American Mothers - http://www.ewg.org/reports/mothersmilk/es.phpFrom EWG - Toxic Fire Retardants in Breast Milk from American Mothers - http://www.ewg.org/reports/mothersmilk/es.php
Internal ExposureInternal Exposure
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A project of the Toxic-Free Legacy Coalition:Breast Cancer Fund, Healthy Building Network, People For Puget Sound, Washington Physicians for Social
Responsibility, Washington State Nurses Association, Washington Toxics Coalition, WashPIRG,and more than 40 other organizations working together to eliminate persistent toxic chemicals in Washington State.
A Study of Toxic Chemicals in WashingtoniansA Study of Toxic Chemicals in Washingtonians
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ToxicologyToxicology
BIOACCUMULATIONBIOACCUMULATION
BIOMAGNIFICATIONBIOMAGNIFICATION
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A Chemical Age
““Almost none of the Almost none of the 15,000 high 15,000 high volume chemicalsvolume chemicals, widely used and , widely used and found in the environment, have been found in the environment, have been tested during development for their tested during development for their endocrine-disrupting effects, either at endocrine-disrupting effects, either at high or background exposure doses.”high or background exposure doses.”
Baskin, et alBaskin, et al
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A Chemical AgeA Chemical Age
82,000 Chemicals Approved for Use since the 82,000 Chemicals Approved for Use since the 1950’s1950’s
EPA Reviews 1,700 New Compounds Each EPA Reviews 1,700 New Compounds Each YearYear
90% Approval Rate90% Approval Rate
25% Evaluated For Toxicity25% Evaluated For Toxicity
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Mechanisms Disrupt Hormone Synthesis
Disrupt Hormone Metabolism
Mimic/Antagonize Endogenous Hormone Effects
Disrupt Hormone Receptor Synthesis
Alter Target Cell Sensitivity
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Toxicologic Principles Dose – Low dose vs. High dose
Timing of Exposure – Sensitive Windows of Vulnerability
Half-life – Short vs. Persistent
Biological Availability - body storage, circulation
Toxicity – a standard battery of animal studies
Genetics Risk Assessment“Safe Dose” determined by formula that uses NOAEL (No Observed Adverse Effect Level) and multiplies by a safety factor
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Toxicology - AssessmentToxicology - Assessment
Dose-Response AnalysisDose-Response Analysis
LDLD5050
NOEL or NOAELNOEL or NOAEL
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Traditional: “The dose makes the poison”
New Paradigm: The dose + timing = poison
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Endocrine Disrupting Endocrine Disrupting ChemicalsChemicals
Problematic Assessment!Problematic Assessment!
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Mechanism of ActionMechanism of Action
Hormone MimicryHormone Mimicry
Endogenous Hormones Endogenous Hormones BlockingBlocking
Mixture Effect
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Endocrine Disrupting Endocrine Disrupting ChemicalsChemicals
Function at Extremely Low ConcentrationsFunction at Extremely Low Concentrations
Inverse Effects at Low and High Doses Inverse Effects at Low and High Doses PossiblePossible
CONTROVERSIAL CONTROVERSIAL PHENOMENONPHENOMENON
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HormesisHormesis
Definition: Dose Definition: Dose Response Response Phenomenon Phenomenon Characterized by:Characterized by:
Low Dose Low Dose StimulationStimulation
High Dose InhibitionHigh Dose Inhibition
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HormesisHormesis
Nonlinear Dose Nonlinear Dose Effect of 17-B-Effect of 17-B-Trenbolone on Trenbolone on Fathead Minnow*Fathead Minnow*
J Or U-Shaped J Or U-Shaped RelationshipsRelationships
*Ankley, 2003*Ankley, 2003
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HormesisHormesis
The “Norm”*
*Kayajanian, 2002*Kayajanian, 2002
Calabrese and Baldwin, 2003Calabrese and Baldwin, 2003
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Traditional DoseTraditional Dose
Eff
ect
Low DoseLow Dose
Low Dose and Traditional Dose
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Diethylstilbestrol (DES)
1st Gen: 40x Increased risk of breast cancer
2nd Gen: vaginal adenocarcinoma in females, hypospadias in male
3rd Gen: possible increased risk of ovarian cancer, hypospadias
4th Gen: ?
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EpigeneticsEpigenetics
First Defined in 1940sFirst Defined in 1940s
Covalent DNA Modification Proposed in Covalent DNA Modification Proposed in 1975 as Mechanism1975 as Mechanism
Revelation That X-Inactivation and Revelation That X-Inactivation and Genomic Imprinting Regulated by Genomic Imprinting Regulated by Epigenetic FactorsEpigenetic Factors
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EpigeneticsEpigenetics
Environmental Influences Linked To Disease Environmental Influences Linked To Disease PhenotypesPhenotypes
Epigenome ModificationEpigenome Modification
Meta-stable epiallelesMeta-stable epialleles
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Epigenome Re-Epigenome Re-ProgrammingProgramming
Erasure of Epigenetic Marks As Erasure of Epigenetic Marks As Primordial Germ Cells Migrate Along Primordial Germ Cells Migrate Along Genital RidgeGenital Ridge
Mark Re-establishment During Mark Re-establishment During GametogenesisGametogenesis
2nd Erasure During Fertilization2nd Erasure During Fertilization
Am J Hum Genet 74, 2004Am J Hum Genet 74, 2004
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Epigenetic Transgenerational Epigenetic Transgenerational ActionsActions
Creates Opportunity for Environmental Creates Opportunity for Environmental Factors To Reprogram The Germ LineFactors To Reprogram The Germ Line
Implications for Evolutionary BiologyImplications for Evolutionary Biology
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Plastics: Phthalates/Bisphenol A Everywhere Chemicals
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Summary of Findings
BPA is a weak estrogen and an anti-androgen, rapidly metabolized (4-6 hours)
Upregulates estrogen alpha receptor in human body
Binds to α-fetoprotein which normally binds to estrogen α increased estrogen circulation
Animal studies
Male reproductive tract
Neurocognitive disorders
Diminishes differences in sexually dimorphic behavior
Early puberty
Increased body size
Low Doses: Breast, Uterine and Prostate Tumor Cell Proliferation
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Bisphenol A and Mammary Gland
Dosed pregnant mice at 25ng/kg from Day 9 of pregnancy through birth.
Examined mammary glands of offspring at Day 30 Found increased terminal bud growth/density Decreased number of apoptotic cells
Muñoz-de-Toro et al. 2005. Endocrinology 146: 4138-4147.
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Bisphenol A and Obesity Obesogens – Promote Adipogenesis at
LOW DOSES
•DES – synthetic estrogenDES – synthetic estrogen•Exposure in utero obese offspring that continued to be obese with restricted caloric intake/increased exercise 3rd generation also obese (increases in leptin, adiponectin, TG)
•Bisphenol ABisphenol A •Alonso-Magdalena, P, et al. 2006. The Estrogenic Effect of Bisphenol-A Disrupts the Pancreatic ß-Cell Function in vivo and Induces Insulin Resistance. Environmental Health Perspectives 114:106-112.
Masuno, H, et al. 2002. Bisphenol A in combination with insulin can accelerate the conversion of 3T3-L1 fibroblasts to adipocytes. Journal of Lipid Research 3:676-684.
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Bisphenol A (BPA) Concentrations
I.A. Lang, PhD; et al JAMA. 2008;300(11):1303-1310. Published online September 16, 2008
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Phthalates
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Phthalate Exposure in Utero
1 2 3
Parks et al. 2000 Toxicol. Sci., 58:339Parks et al. 2000 Toxicol. Sci., 58:339
Maternal PhthalateMaternal PhthalateExposureExposure
Gestational Days Postnatal Days
Tes
tost
ero
ne
(ng
/tes
tis)
Tes
tost
ero
ne
(ng
/tes
tis)
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“Phthalate syndrome”
Malformations of Epididymis, Vas deferens, Seminal Vesicles, Prostate
Hypospadias Undescended Testicles
Nipple retention
Reduced AGDReduced AGD
DEHPDEHP
Gray and Foster 2003, Foster Gray and Foster 2003, Foster 20052005
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Testicular Dysgenesis Syndrome
Environmental Factors(including Endocrine disrupters)
Testicular Dysgenesis
Disturbed SertoliCell Function
Decreased LeydigCell Function
AndrogenInsufficiency
Hypospadias
Cryptorchidism
CIS
Reduced Semen Quality
Testicular Cancer
Impaired GermCell Differentiation
From Skakkebæk et al.
Genetic Defects
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Phthalates in Childhood
Hauser et al 2005 NICU Setting – found urinary levels of DEHP to be 50x higher in preterm neonates as compared to levels in children from NHANES
**FDA has released a statement saying that premature infants may be adversely affected by these chemicals
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Why are We Concerned?
Main et al – 2006
Found a significant association between breastfeeding phthalate exposures and luteinizing hormone (positive) and free testosterone levels (negative) in newborn boys with cryptorchidism
Swan et al – 2008
Found a significant association between prenatal phthalate levels and decreased anogenital distance, reduced testicular descent, decreased penile width in infants
Human Data
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Phthalates and Human Health
Altered sperm quality in adult males
Duty et al. 2004, Hauser et al. 2008
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Howdeshell, K. L. et al. Toxicol. Sci. 2007 99:190-202; doi:10.1093/toxsci/kfm069
Abnormalities in Response to Cumulative Phthalate
Exposure
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Endocrine Society Statement
“Scientific societies such as the Endocrine Society should partner with other organizations with the scientific
and medical expertise to evaluate effects of endocrine disrupting chemicals
in humans”
Diamanti-Kandaris E et al. 2009. Endocrine-Disrupting Chemicals: An Endocrine Society Scientific Statement. Endocrine Reviews 30(4):293-34
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It’s All It’s All
About About
The TimingThe Timing
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*Fetus - Most Sensitive Life *Fetus - Most Sensitive Life StageStage
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Weeks Weeks 00 8 8 16 16 24 24 32 32 40 40_______________________________________________________________________________________________________________________
_______________________________________________________________________________________________________________________
|___________________________Kidney_______________________________Kidney_______________________________||
PrProneonephrphrososMMesonepesonephrhrosos
||
||
PriPrimitive mitive GonadGonad
GonGonadal adal RidgeRidge
| Testes or OvariesTestes or Ovaries|
|____________PhallusPhallus__________________||
||
| |
|CloacaCloaca|
||UG SinusUG Sinus__||
_________Bladder Bladder |
|
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Prenatal Exposure
www.criticalwindows.com/go_display.php
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Monobutyl Phthalate in Spot Urine Samples
Urinary MBP* (ppb)
No.
of
sub
ject
s
* A metabolite of dibutyl phthalate* A metabolite of dibutyl phthalate Source: Blount, B.C. et al. 2000 EHP 108: 979-Source: Blount, B.C. et al. 2000 EHP 108: 979-982982
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Mean phthalate (MBP) metabolite levels (ppb) by
AGI category
Source: Swan, et al. 2005. EHP Vol. 113, no. 8.Source: Swan, et al. 2005. EHP Vol. 113, no. 8.
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Population Health
Effects of EDC Can be Subtle
Increased Variance from the Mean*
Individual Effect May Be More Difficult to Detect
*Orlando and Guillette, 2001*Orlando and Guillette, 2001
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Sperm Density
Declines:
United States (1938-1988)
Western Europe (1971-1989)
No Change:
Non-Western Countries(1978-1990)
Swan: EHP; 105: 1997Swan: EHP; 105: 1997
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Risk AssessmentRisk Assessment
Phase 1 - Hazard IdentificationPhase 1 - Hazard Identification
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Di-ethylhexyl phthalate (DEHP)Di-ethylhexyl phthalate (DEHP)
• Phthalate PlasticizerPhthalate Plasticizer• 2 million tons/year2 million tons/year• Ubiquitous exposureUbiquitous exposure• General UsesGeneral Uses
– Building materialsBuilding materials– ClothingClothing– PackagingPackaging– Medical DevicesMedical Devices
““EVERYWHERE EVERYWHERE CHEMICAL”CHEMICAL”
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Prenatal ExposurePrenatal Exposure
www.criticalwindows.com/go_display.phpwww.criticalwindows.com/go_display.php
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Risk AssessmentRisk Assessment
Phase 1 - Hazard IdentificationPhase 1 - Hazard Identification
Phase 2 - Exposure AssessmentPhase 2 - Exposure Assessment
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Toxic Chemicals FoundToxic Chemicals Found
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Phthalate Exposure Dose
NeonatesNeonates
54 Infants Classified by Exposure to DEHP 54 Infants Classified by Exposure to DEHP Based on Medical ProductsBased on Medical Products
MEHP Levels 5.1 fold in High Exposure GroupMEHP Levels 5.1 fold in High Exposure Group
Green et al: Environment Health Perspectives, 2005Green et al: Environment Health Perspectives, 2005
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Phthalate Exposure DoseTable C.2 Summary statistics for phthalate monoester metabolites in PPWC and NHANES
PPWC 3 Monoester
Metabolite
NHANES2
50th 25th 50th 75th % > LOD
MEHP 4.1 1.3 3.2 8.8 80.2
MEOHP 13.0 5.1 10.8 21.5 95.3
MEHHP 18.2 6.0 11.2 22.3 98.1
MEP 167 50 115 437 98.1
MBP 21.6 7.3 14.3 32.2 96.2
MiBP 2.5 0.9 2.6 4.8 76.4
MMP 1.3 0.7 0.7 2.9 55.6
MBzP 15.4 3.5 8.9 24.4 95.3
MCPP 3.0 0.7 2.1 3.6 69.8 1 Not creatinine corrected 2 NHANES 2001-02, Females age 6 and over 3 Maternal prenatal samples
Pregnancy Pregnancy ExposureExposure
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Risk AssessmentRisk Assessment
Phase 1 - Hazard IdentificationPhase 1 - Hazard Identification
Phase 2 - Exposure AssessmentPhase 2 - Exposure Assessment
Phase 3 - Dose Response AssessmentPhase 3 - Dose Response Assessment
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Copyright ©1998 The Endocrine Society
Andersson, A.-M. et al. J Clin Endocrinol Metab 1998;83:675-681
Testosterone ProductionTestosterone Production
Large Variations in Breast Large Variations in Breast Milk mEHP LevelsMilk mEHP Levels
SHBG LevelsSHBG Levels
LH LevelsLH Levels
Free TestosteroneFree Testosterone
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Prenatal Phthalate ExposurePrenatal Phthalate Exposure Anogenital Index Decreased With Anogenital Index Decreased With
Increased Phthalate ExposureIncreased Phthalate Exposure
Correlated WithCorrelated With Penile VolumePenile Volume CryptorchidismCryptorchidism
Concentrations Below That Found in Concentrations Below That Found in 25% of Female Population in the U.S.25% of Female Population in the U.S.
Swan, EHP: 113(8), 2005Swan, EHP: 113(8), 2005
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Anogenital DistanceAnogenital Distance
Bioassay of Fetal Bioassay of Fetal Androgen Activity in Androgen Activity in Animal StudiesAnimal Studies
Sexual Dimorphism Sexual Dimorphism Suggested in HumansSuggested in Humans11
Prima Facie Evidence For Prima Facie Evidence For In UteroIn Utero Exposure in Exposure in Humans as WellHumans as Well
1Salazar-Martinez, Env Health 3:2004
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AGD - Sexual DimorphismAGD - Sexual Dimorphism
Beard, Sathyanaryana, Grady, 2008Beard, Sathyanaryana, Grady, 2008
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Ongoing Studies at Children’s and UW
Newborn AGD – completed in UW newborn nursery
Case Control of AGD in cases of children with male reproductive abnormalities and controls
PRIME – Premature Infants in the Medical Environment (NICU) @ Swedish/Prov Everett
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How Do We Avoid These Chemicals?
Plastic #3 on recycling codes
do not microwave food in plastic
do not place hot liquids in plastic containers
do not dish wash your plastics – leads to degradation
use alternatives to plastic packaging when possible
Toys/Personal Care Products
some are labeled phthalate free but difficult to know true content
support product labeling – CA Prop 65
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Precautionary Approach:Alternative Products
Look for recycling code and avoid use of #7 (may or may not contain Bisphenol A) when possible
Use safe alternatives such as glass or polyethylene plastic
Choose canned foods from makers who don’t use BPA (i.e. Eden foods)
Try to buy soups/milk/milk products in cardboard cartons
Choose alternatives to canned foods: Fresh fruits and vegetables
Stainless Steel Water Bottles
Bisphenol A free bottles
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How to Counsel Families
Recognize Limited data on health impacts of modern chemicals
Not useful to conduct body burden testing
Work on decreasing exposures as much as possible (can never get to zero) Env Working Group (pesticide in foods) Env Defense Fund (safe seafood) Clean Indoor Air (American Lung Association)
Educate with appropriate resources
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Policy Implications
2005 European Union, Banned use of DEHP, DBP, and BBzP in all children’s toys and childcare articles
banned the use of DiDP, DnOP, and DINP in toys and childcare articles which can be placed in the mouth by children.
2007 Washington, Passed state law – Children’s Safe Products Act
Restricts phthalates in children’s toys
Also, decreases amount of lead/cadmium in toys
2008 US Federal Legislation, Toxic Toys Bill
Restricts phthalates in children’s toys
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PEHSU: Pediatric Environmental PEHSU: Pediatric Environmental Health Specialty Unit (US EPA/ATSDR)Health Specialty Unit (US EPA/ATSDR)
Serve health care providers, Serve health care providers, public health professionals, public health professionals, communities, and familiescommunities, and families
Unique interface of pediatric Unique interface of pediatric medicine-toxicology-teratology-medicine-toxicology-teratology-epidemiology-exposure sciencesepidemiology-exposure sciences
Evidence-based Consultation and Evidence-based Consultation and EducationEducation
UW PEHSU: OR, ID, AK, WAUW PEHSU: OR, ID, AK, WA
Creates informational handouts Creates informational handouts for familiesfor families
1-877-KID-CHEM1-877-KID-CHEM http://depts.washington.edu/pehsu/http://depts.washington.edu/pehsu/
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A Turning Point
““Many are turning to the Many are turning to the government government
for assurance that these for assurance that these chemicalschemicals
have been assessed using the have been assessed using the best available science. Current best available science. Current
law doesn't allow us to give law doesn't allow us to give those assurances.”those assurances.”
Lisa Jackson, Chief, US EPA
Paradigm Shift: A chemical is harmfulParadigm Shift: A chemical is harmful until until proven otherwise; Precautionary Principleproven otherwise; Precautionary Principle
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Reductionism
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As Physicians We Have a Special Knowledge and
Duty to Use it to Enhance Public Health
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And all that the Lorax left here in this mess was a small a pile of rocks, with the one word, “UNLESS.”
UNLESS someone like you cares a whole awful lot, nothing is going to get better. It’s not.
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Get Involved
Learn More About the Topic
Investigate
Advocate
Join Washington Physicians for Social Responsibility
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Acknowledgements
Bill Bremner/John Amory
Dimitri Christakis Fred Rivara Martin Koyle Urology Faculty at
SCH
Kristy Ivicek Swedish NICU Providence NICU
Center for Ecogenetics and Environmental Health
Shanna Swan Catherine Karr Center for Clinical
and Translational Research
Academic Enrichment Fund