Endocrine disruptors are chemicals that at certain doses, can interfere with the endocrine (or hormone system) in mammals. These disruptions can cause cancerous tumors, birth defects, and other developmental disorders. Any system in the body controlled by hormones, can be derailed by hormone disruptors. Specifically, endocrine disruptors may be associated with the development of learning disabilities, severe attention deficit disorder, cognitive and brain development problems; deformations of the body (including limbs); breast cancer, prostate cancer, thyroid and other cancers; sexual development problems such as feminizing of males or masculine effects on females, etc. The critical period of development for most organisms is between the transition from a fertilized egg, into a fully formed infant. As the cells begin to grow and differentiate, there are critical balances of hormones and protein changes that must occur. Therefore, a dose of disrupting chemicals may do substantial damage to a developing fetus (baby). The same dose may not significantly affect adult mothers.
There has been controversy over endocrine disruptors, with some groups calling for swift action by regulators to remove them from the market, and regulators and other scientists calling for further study. Some endocrine disruptors have been identified and removed from the market (for example, a drug called diethylstilbestrol), but it is uncertain whether some endocrine disruptors on the market actually harm humans and wildlife at the doses to which wildlife and humans are exposed. Additionally, a key scientific paper, published in the journal Science, which helped launch the movement of those opposed to endocrine disruptors, was retracted and its author found to have committed scientific misconduct.
Found in many household and industrial products, endocrine disruptors are substances that "interfere with the synthesis, secretion, transport, binding, action, or elimination of natural hormones in the body that are responsible for development, behavior, fertility, and maintenance of homeostasis (normal cell metabolism)." They are sometimes also referred to as hormonally active agents, endocrine disrupting chemicals, or endocrine disrupting compounds (EDCs).
Studies in cells and laboratory animals have shown that EDs can cause adverse biological effects in animals, and low-level exposures may also cause similar effects in human beings. The term endocrine disruptor is often used as synonym for xenohormone although the latter can mean any naturally occurring or artificially produced compound showing hormone-like properties (usually binding to certain hormonal receptors). EDCs in the environment may also be related to reproductive and infertility problems in wildlife and bans and restrictions on their use has been associated with a reduction in health problems and the recovery of some wildlife populations.
- 1 History of the field of endocrine disruption
- 2 Endocrine system
- 3 Dose-response controversy
- 4 Routes of exposure
- 5 Types of endocrine disruptors
- 6 Uses of long-chain alkylphenols
- 7 Temporal trends of body burden
- 8 Legal approach
- 9 Environmental and human body cleanup
- 10 See also
- 11 References
- 12 Further reading
- 13 External links
History of the field of endocrine disruption
The term endocrine disruptor was coined at the Wingspread Conference Centre in Wisconsin, in 1991. One of the early papers on the phenomenon was by Theo Colborn in 1993. In this paper, she stated that environmental chemicals disrupt the development of the endocrine system, and that effects of exposure during development are often permanent. Although the endocrine disruption has been disputed by some, work sessions from 1992 to 1999 have generated consensus statements from scientists regarding the hazard from endocrine disruptors, particularly in wildlife and also in humans. The Endocrine Society released a scientific statement outlining mechanisms and effects of endocrine disruptors on “male and female reproduction, breast development and cancer, prostate cancer, neuroendocrinology, thyroid, metabolism and obesity, and cardiovascular endocrinology,” and showing how experimental and epidemiological studies converge with human clinical observations “to implicate EDCs as a significant concern to public health.” The statement noted that it is difficult to show that endocrine disruptors cause human diseases, and it recommended that the precautionary principle should be followed. A concurrent statement expresses policy concerns.
Endocrine disrupting compounds encompass a variety of chemical classes, including drugs, pesticides, compounds used in the plastics industry and in consumer products, industrial by-products and pollutants, and even some naturally produced botanical chemicals. Some are pervasive and widely dispersed in the environment and may bio-accumulate. Some are persistent organic pollutants (POP's), and can be transported long distances across national boundaries and have been found in virtually all regions of the world, and may even concentrate near the North Pole, due to weather patterns and cold conditions. Others are rapidly degraded in the environment or human body or may be present for only short periods of time. Health effects attributed to endocrine disrupting compounds include a range of reproductive problems (reduced fertility, male and female reproductive tract abnormalities, and skewed male/female sex ratios, loss of fetus, menstrual problems); changes in hormone levels; early puberty; brain and behavior problems; impaired immune functions; and various cancers.
One example of the consequences of the exposure of developing animals, including humans, to hormonally active agents is the case of the drug diethylstilbestrol (DES), a non-steroidal estrogen and not an environmental pollutant. Prior to its ban in the early 1970s, doctors prescribed DES to as many as five million pregnant women to block spontaneous abortion, an off-label use of this medication prior to 1947. It was discovered after the children went through puberty that DES affected the development of the reproductive system and caused vaginal cancer. The relevance of the DES saga to the risks of exposure to endocrine disruptors is questionable, as the doses involved are much higher in these individuals than in those due to environmental exposures.
In 2013 the WHO and the United Nations Environment Programme released a study, the most comprehensive report on EDCs to date, calling for more research to fully understand the associations between EDCs and the risks to health of human and animal life. The team pointed to wide gaps in knowledge and called for more research to obtain a fuller picture of the health and environmental impacts of endocrine disruptors. To improve global knowledge the team has recommended:
- Testing: known EDCs are only the 'tip of the iceberg' and more comprehensive testing methods are required to identify other possible endocrine disruptors, their sources, and routes of exposure.
- Research: more scientific evidence is needed to identify the effects of mixtures of EDCs on humans and wildlife (mainly from industrial by-products) to which humans and wildlife are increasingly exposed.
- Reporting: many sources of EDCs are not known because of insufficient reporting and information on chemicals in products, materials and goods.
- Collaboration: more data sharing between scientists and between countries can fill gaps in data, primarily in developing countries and emerging economies.
Hormones travel throughout the body and act as chemical messengers. Hormones interface with cells that contain matching receptors in or on their surfaces. The hormone binds with the receptor, much like a key would fit into a lock. The endocrine system regulates adjustments through slower internal processes, using hormones as messengers. The endocrine system secretes hormones in response to environmental stimuli and to orchestrate developmental and reproductive changes. The adjustments brought on by the endocrine system are biochemical, changing the cell's internal and external chemistry to bring about a long term change in the body. These systems work together to maintain the proper functioning of the body through its entire life cycle. Sex steroids such as estrogens and androgens, as well as thyroid hormones, are subject to feedback regulation, which tends to limit the sensitivity of these glands.
Hormones work at very small doses (part per billion ranges). Endocrine disruption can thereby also occur from low-dose exposure to exogenous hormones or hormonally active chemicals that can interfere with receptors for other hormonally mediated processes. Furthermore, since endogenous hormones are already present in the body in biologically active concentrations, additional exposure to relatively small amounts of exogenous hormonally active substances can disrupt the proper functioning of the body's endocrine system. Thus, an endocrine disruptor can elicit adverse effects at much lower doses than a toxicity, acting through a different mechanism.
The timing of exposure is also critical. Most critical stages of development occur in utero, where the fertilized egg divides, rapidly developing every structure of a fully formed baby, including much of the wiring in the brain. Interfering with the hormonal communication in utero can have profound effects both structurally and toward brain development. Depending on the stage of reproductive development, interference with hormonal signaling can result in irreversible effects not seen in adults exposed to the same dose for the same length of time. Experiments with animals have identified critical developmental time points in utero and days after birth when exposure to chemicals that interfere with or mimic hormones have adverse effects that persist into adulthood. Disruption of thyroid function early in development may be the cause of abnormal sexual development in both males and females early motor development impairment, and learning disabilities.
There are studies of cell cultures, laboratory animals, wildlife, and accidentally exposed humans that show that environmental chemicals cause a wide range of reproductive, developmental, growth, and behavior effects, and so while "endocrine disruption in humans by pollutant chemicals remains largely undemonstrated, the underlying science is sound and the potential for such effects is real." While compounds that produce estrogenic, androgenic, antiandrogenic, and antithyroid actions have been studied, less is known about interactions with other hormones.
The interrelationship between exposures to chemicals and health effects are rather complex. It is hard to definitively link a particular chemical with a specific health effect, and exposed adults may not show any ill effects. But, fetuses and embryos, whose growth and development are highly controlled by the endocrine system, are more vulnerable to exposure and may suffer overt or subtle lifelong health and/or reproductive abnormalities. Prebirth exposure, in some cases, can lead to permanent alterations and adult diseases.
Some in the scientific community are concerned that exposure to endocrine disruptors in the womb or early in life may be associated with neurodevelopmental disorders including reduced IQ, ADHD, and autism. Certain cancers and uterine abnormalities in women are associated with exposure to Diethylstilbestrol (DES) in the womb due to DES used as a medical treatment.
In another case, phthalates in pregnant women’s urine was linked to subtle, but specific, genital changes in their male infants – a shorter, more female-like anogenital distance and associated incomplete descent of testes and a smaller scrotum and penis. The science behind this study has been questioned by phthalate industry consultants. As of June 2008, there are only five studies of anogenital distance in humans, and one researcher has stated "Whether AGD measures in humans relate to clinically important outcomes, however, remains to be determined, as does its utility as a measure of androgen action in epidemiologic studies."
One major objection to the theory of endocrine disruptors is the dosage effect. There is a large gap between high exposures seen in a laboratory experiment versus the relatively low levels found in the environment. Critics argue that dose-response relationship data suggest that the amounts of the chemicals actually in the environment are too low to cause an effect. A consensus statement by the Learning and Development Disabilities Initiative rebuts this criticism arguing that "The very low-dose effects of endocrine disruptors can not be predicted from high-dose studies, which contradicts the standard 'dose makes the poison' rule of toxicology. Nontraditional dose-response curves are referred to as nonmonotonic dose response curves." Furthermore, endocrine disrupting effects have been noted in animals exposed to environmentally relevant levels of some chemicals. For example, researchers have found that a common flame retardant, PBDE-47, affects the reproductive system and thyroid gland of female rats in doses of the order of those to which humans are exposed.
The dosage objection could also be overcome if low concentrations of different endocrine disruptors were synergistic, which was asserted in a paper by Arnold. This paper was published in Science in June 1996, and was one reason for the passage of the Food Quality Protection Act of 1996. The results could not be confirmed with the same and alternative methodologies, and the original paper was retracted, with Arnold found to have committed scientific misconduct by the United States Office of Research Integrity. Subsequent papers by other authors demonstrated that low concentrations of endocrine disruptors can have synergistic effects in amphibians, but it is not clear that this is an effect mediated through the endocrine system.
The conventional relationship (more exposure equals higher risk) has been challenged by some studying endocrine disruptors. For example, it has been claimed that Tamoxifen and some phthalates have fundamentally different (and harmful) effects on the body at low doses than at high doses.
Routes of exposure
Food is a major mechanism by which people are exposed to pollutants. Diet is thought to account for up to 90% of a person's PCB and DDT body burden. In a study of 32 different common food products from three grocery stores in Dallas, fish and other animal products were found to be contaminated with PBDE. Since these compounds are fat soluble, it is likely they are accumulating from the environment in the fatty tissue of animals we eat. Some suspect fish consumption is a major source of many environmental contaminates. Indeed, both wild and farmed salmon from all over the world have been shown to contain a variety of man-made organic compounds.
With the increase in household products containing pollutants and the decrease in the quality of building ventilation, indoor air has become a significant source of pollutant exposure. Residents living in homes with wood floors treated in the 1960s with PCB-based wood finish have a much higher body burden than the general population. A study of indoor house dust and dryer lint of 16 homes found high levels of all 22 different PBDE congeners tested for in all samples. Recent studies suggest that contaminated house dust, not food, may be the major source of PBDE in our bodies. One study estimated that ingestion of house dust accounts for up to 82% of our PBDE body burden.
Research conducted by the Environmental Working Group found that 19 out of 20 children tested had levels of PBDE in their blood 3.5 times higher than the amount in their mothers' blood. It has been shown that contaminated housedust is a primary source of lead in young children's bodies. It may be that babies and toddlers ingest more contaminated housedust than the adults they live with, and therefore have much higher levels of pollutants in their systems.
Consumer goods are another potential source of exposure to endocrine disruptors. An analysis of the composition of 42 household cleaning and personal care products versus 43 "chemical free" products has been performed. The products contained 55 different chemical compounds: 50 were found in the 42 conventional samples representing 170 product types, while 41 were detected in 43 "chemical free" samples representing 39 product types. Parabens, a class of chemicals that has been associated with reproductive-tract issues, were detected in seven of the "chemical free" products, including three sunscreens that did not list parabens on the label. Vinyl products such as shower curtains were found to contain more than 10% by weight of the compound DEHP, which when present in dust has been associated with asthma and wheezing in children. The risk of exposure to chemical compounds increases as products, both conventional and "chemical free," are used in combination. "If a consumer used the alternative surface cleaner, tub and tile cleaner, laundry detergent, bar soap, shampoo and conditioner, facial cleanser and lotion, and toothpaste [he or she] would potentially be exposed to at least 19 compounds: 2 parabens, 3 phthalates, MEA, DEA, 5 alkylphenols, and 7 fragrances."
An analysis of the endocrine disrupting chemicals in Old Order Mennonite women in mid-pregnancy determined that they have much lower levels in their systems than the general population. Mennonites eat mostly fresh, unprocessed foods, farm without pesticides, and use few or no cosmetics or personal care products. One woman who had reported using hairspray and perfume had high levels of monoethyl phthalate, while the other women all had levels below detection. Three women who reported being in a car or truck within 48 hours of providing a urine sample had higher levels of diethylhexyl phthalate which is found in polyvinyl chloride, and is used in car interiors.
Types of endocrine disruptors
All people are exposed to chemicals with estrogenic effects in their everyday life, because endocrine disrupting chemicals are found in low doses in thousands of products. Chemicals commonly detected in people include DDT, polychlorinated biphenyls (PCB's), bisphenol A (BPA), polybrominated diphenyl ethers (PBDE's), and a variety of phthalates. In fact, almost all plastic products, including those advertised as "BPA free", have been found to leach endocrine-disrupting chemicals. In a 2011, study it was found that some "BPA-free" products released more endocrine active chemicals than the BPA-containing products.
There is some dispute in the scientific community surrounding the claim that these chemicals actually disrupt the endocrine system. Many believe that there is little evidence that the degree of exposure in humans is enough to warrant concern, while many others believe there is evidence that these chemicals pose some risk to human health.
Some researchers are investigating the health risks to children of endocrine disrupting chemicals. Bisphenol A, until 2010 a common component in the plastic used to manufacture plastic baby bottles, has been banned in most countries. In 2010, despite strong industry opposition, Canada was the first to ban BPA's use in baby bottles. Australia and the European Union followed in 2011. Several states in the United States had banned its use by 2011, and in 2012 a nation-wide ban was put in place.
Xenoestrogens are a type of xenohormone that imitates estrogen. Synthetic xenoestrogens include widely used industrial compounds, such as PCBs, BPA and phthalates, which have estrogenic effects on a living organism.
Alkylphenols are xenoestrogens. The European Union has implemented sales and use restrictions on certain applications in which nonylphenols are used because of their alleged "toxicity, persistence, and the liability to bioaccumulate" but the United States EPA has taken a slower approach to make sure that action is based on "sound science".
Bisphenol A (BPA)
Bisphenol A is commonly found in plastic bottles, plastic food containers, dental materials, and the linings of metal food and infant formula cans. Another exposure comes from receipt paper commonly used at grocery stores and restaurants, because today the paper is commonly coated with a BPA containing clay for printing purposes.
BPA is a known endocrine disruptor, and numerous studies have found that laboratory animals exposed to low levels of it have elevated rates of diabetes, mammary and prostate cancers, decreased sperm count, reproductive problems, early puberty, obesity, and neurological problems. Early developmental stages appear to be the period of greatest sensitivity to its effects, and some studies have linked prenatal exposure to later physical and neurological difficulties. Regulatory bodies have determined safety levels for humans, but those safety levels are currently being questioned or are under review as a result of new scientific studies. A 2011 study that investigated the number of chemicals pregnant women are exposed to in the U.S. found BPA in 96% of women.
In 2010 the World Health Organization expert panel recommended no new regulations limiting or banning the use of Bisphenol-A, stating that "initiation of public health measures would be premature."
In August 2008, the U.S. FDA issued a draft reassessment, reconfirming their initial opinion that, based on scientific evidence, it is safe. However in October 2008, FDA's advisory Science Board concluded that the Agency's assessment was "flawed" and hadn't proven the chemical to be safe for formula-fed infants. In January 2010, the FDA issued a report indicating that, due to findings of recent studies that used novel approaches in testing for subtle effects, both the National Toxicology Program at the National Institutes of Health as well as the FDA have some level of concern regarding the possible effects of BPA on the brain and behavior of fetuses, infants and younger children. In 2012 the FDA did ban the use of BPA in baby bottles, however the Environmental Working Group called the ban "purely cosmetic". In a statement they said,“If the agency truly wants to prevent people from being exposed to this toxic chemical associated with a variety of serious and chronic conditions it should ban its use in cans of infant formula, food and beverages." The Natural Resources Defense Council called the move inadequate saying, the FDA needs to ban BPA from all food packaging. In a statement a FDA spokesman said the agency's action was not based on safety concerns and that "the agency continues to support the safety of BPA for use in products that hold food."
Uses of long-chain alkylphenols
The long-chain alkylphenols are used extensively as precursors to the detergents, as additives for fuels and lubricants, polymers, and as components in phenolic resins. These compounds are also used as building block chemicals that are also used in making fragrances, thermoplastic elastomers, antioxidants, oil field chemicals and fire retardant materials. Through the downstream use in making alkylphenolic resins, alkylphenols are also found in tires, adhesives, coatings, carbonless copypaper and high performance rubber products. They have been used in industry for over 40 years.
Dichloro-diphenyl-trichloroethane (DDT) was first used as a pesticide against Colorado potato beetles on crops beginning in 1936. An increase in the incidence of malaria, epidemic typhus, dysentery, and typhoid fever led to its use against the mosquitoes, lice, and houseflies that carried these diseases. Before World War II, pyrethrum, an extract of a flower from Japan, had been used to control these insects and the diseases they can spread. During World War II, Japan stopped exporting pyrethrum, forcing the search for an alternative. Fearing an epidemic outbreak of typhus, every British and American soldier was issued DDT, who used it to routinely dust beds, tents, and barracks all over the world.
DDT was approved for general, non-military use after the war ended. It became used worldwide to increase monoculture crop yields that were threatened by pest infestation, and to reduce the spread of malaria which had a high mortality rate in many parts of the world. Its use for agricultural purposes has since been prohibited by national legislation of most countries, while its use as a control against malaria vectors is permitted, as specifically stated by the Stockholm Convention on Persistent Organic Pollutants
As early as 1946, the harmful effects of DDT on bird, beneficial insects, fish, and marine invertebrates were seen in the environment. The most infamous example of these effects were seen in the eggshells of large predatory birds, which did not develop to be thick enough to support the adult bird sitting on them. Further studies found DDT in high concentrations in carnivores all over the world, the result of biomagnification through the food chain. Twenty years after its widespread use, DDT was found trapped in ice samples taken from Antarctic snow, suggesting wind and water are another means of environmental transport. Recent studies show the historical record of DDT deposition on remote glaciers in the Himalayas.
More than sixty years ago when biologists began to study the effects of DDT on laboratory animals, it was discovered that DDT interfered with reproductive development. Recent studies suggest DDT may inhibit the proper development of female reproductive organs that adversely affects reproduction into maturity. Additional studies suggest that a marked decrease in fertility in adult males may be due to DDT exposure. Most recently, it has been suggested that exposure to DDT in utero can increase a child's risk of childhood obesity. DDT is still used as anti-malarial insecticide in Africa and parts of Southeast Asia in limited quantities.
Polychlorinated biphenyls (PCBs) are a class of chlorinated compounds used as industrial coolants and lubricants. PCBs are created by heating benzene, a byproduct of gasoline refining, with chlorine. They were first manufactured commercially by the Swann Chemical Company in 1927. In 1933, the health effects of direct PCB exposure was seen in those who worked with the chemicals at the manufacturing facility in Alabama. In 1935, Monsanto acquired the company, taking over US production and licensing PCB manufacturing technology internationally.
General Electric was one of the largest US companies to incorporate PCBs into manufactured equipment. Between 1952 and 1977, the New York GE plant had dumped more than 500,000 pounds of PCB waste into the Hudson River. PCBs were first discovered in the environment far from its industrial use by scientists in Sweden studying DDT.
The effects of acute exposure to PCBs were well known within the companies who used Monsanto's PCB formulation who saw the effects on their workers who came into contact with it regularly. Direct skin contact results in a severe acne-like condition called chloracne. Exposure increases the risk of skin cancer, liver cancer, and brain cancer. Monsanto tried for years to downplay the health problems related to PCB exposure in order to continue sales.
The detrimental health effects of PCB exposure to humans became undeniable when two separate incidents of contaminated cooking oil poisoned thousands of residents in Japan (Yushō disease, 1968) and Taiwan (Yu-cheng disease, 1979), leading to a worldwide ban on PCB use in 1977. Recent studies show the endocrine interference of certain PCB congeners is toxic to the liver and thyroid, increases childhood obesity in children exposed prenatally, and may increase the risk of developing diabetes.
PCBs in the environment may also be related to reproductive and infertility problems in wildlife. In Alaska it is thought that they may contribute to reproductive defects, infertility and antler malformation in some deer populations. Declines in the populations of otters and sea lions may also be partially due to their exposure to PCBs, the insecticide DDT, other persistent organic pollutants. Bans and restrictions on the use of EDCs have been associated with a reduction in health problems and the recovery of some wildlife populations.
Polybrominated diphenyl ethers
Polybrominated diphenyl ethers (PBDEs) are a class of compounds found in flame retardants used in plastic cases of televisions and computers, electronics, carpets, lighting, bedding, clothing, car components, foam cushions and other textiles. Potential health concern: PBDE's are structurally very similar to Polychlorinated biphenyls (PCBs), and have similar neurotoxic effects. Research has correlated halogenated hydrocarbons, such as PCBs, with neurotoxicity. PBDEs are similar in chemical structure to PCBs, and it has been suggested that PBDEs act by the same mechanism as PCBs.
In the 1930s and 1940s, the plastics industry developed technologies to create a variety of plastics with broad applications. Once World War II began, the US military used these new plastic materials to improve weapons, protect equipment, and to replace heavy components in aircraft and vehicles. After WWII, manufacturers saw the potential plastics could have in many industries, and plastics were incorporated into new consumer product designs. Plastics began to replace wood and metal in existing products as well, and today plastics are the most widely used manufacturing materials.
By the 1960s, all homes were wired with electricity and had numerous electrical appliances. Cotton and wood had been the dominant textile used to produce home furnishings, but now their home furnishings were composed of mostly synthetic materials. More than 500 billion cigarettes were consumed each year in the 1960s, as compared to less than 3 billion per year at the turn of the century. When combined with high density living, the potential for home fires was higher in the 1960s than it had ever been in the US. By the late 1970s, approximately 6000 people in the US died each year in home fires.
In 1972, in response to this situation, the National Commission on Fire Prevention and Control was created to study the fire problem in the US. In 1973 they published their findings in America Burning, a 192-page report that made recommendations to increase fire prevention. Most of the recommendations dealt with fire prevention education and improved building engineering, such as the installation of fire sprinklers and smoke detectors. The Commission expected that with the recommendations, a 5% reduction in fire losses could be expected each year, halving the annual losses within 14 years.
Historically, treatments with alum and borax were used to reduce the flammability of fabric and wood, as far back as Roman times. Since it is a non-absorbent material once created, flame retardant chemicals are added to plastic during the polymerization reaction when it is formed. Organic compounds based on halogens like bromine and chlorine are used as the flame retardant additive in plastics, and in fabric based textiles as well. The widespread use of brominated flame retardants may be due to the push from Great Lakes Chemical Corporation (GLCC) to profit from its huge investment in bromine. In 1992, the world market consumed approximately 150,000 tonnes of bromine-based flame retardants, and GLCC produced 30% of the world supply.
PBDEs have the potential to disrupt thyroid hormone balance and contribute to a variety of neurological and developmental deficits, including low intelligence and learning disabilities. Many of the most common PBDE's were banned in the European Union in 2006. Studies with rodents have suggested that even brief exposure to PBDEs can cause developmental and behavior problems in juvenile rodents and exposure interferes with proper thyroid hormone regulation.
Phthalates are found in some soft toys, flooring, medical equipment, cosmetics and air fresheners. They are of potential health concern because they are known to disrupt the endocrine system of animals, and some research has implicated them in the rise of birth defects of the male reproductive system.
Although an expert panel has concluded that there is "insufficient evidence" that they can harm the reproductive system of infants, California and Europe have banned them from toys. One phthalate, Bis(2-ethylhexyl) phthalate (DEHP), used in medical tubing, catheters and blood bags, may harm sexual development in male infants. In 2002, the Food and Drug Administration released a public report which cautioned against exposing male babies to DEHP. Although there are no direct human studies the FDA report states: "Exposure to DEHP has produced a range of adverse effects in laboratory animals, but of greatest concern are effects on the development of the male reproductive system and production of normal sperm in young animals. In view of the available animal data, precautions should be taken to limit the exposure of the developing male to DEHP". Similarly, phthalates may play a causal role in disrupting masculine neurological development when exposed prenatally.
PFOA exerts hormonal effects including alteration of thyroid hormone levels. Blood serum levels of PFOA were associated with an increased time to pregnancy — or "infertility" — in a 2009 study. PFOA exposure is associated with decreased semen quality. PFOA appeared to act as an endocrine disruptor by a potential mechanism on breast maturation in young girls. A C8 Science Panel status report noted an association between exposure in girls and a later onset of puberty.
Other suspected endocrine disruptors
Some other examples of putative EDCs are polychlorinated dibenzo-dioxins (PCDDs) and -furans (PCDFs), polycyclic aromatic hydrocarbons (PAHs), phenol derivatives and a number of pesticides (most prominent being organochlorine insecticides like endosulfan, Kepone(chlordecone) and DDT and its derivatives, the herbicide atrazine, and the fungicide vinclozolin), the contraceptive 17-alpha ethinylestradiol, as well as naturally occurring phytoestrogens such as genistein and mycoestrogens such as zearalenone.
The molting in crustaceans is an endocrine-controlled process. In the marine penaeid shrimp Litopenaeus vannamei, exposure to endosulfan resulted increased susceptibility to acute toxicity and increased mortalities in the postmolt stage of the shrimp.
Temporal trends of body burden
Since being banned, the average human body burdens of DDT and PCB have been declining. Since their ban in 1972, the PCB body burden is 1/100 of what it was in the early 1980s (Weschler 2009). Monitoring programs of European breast milk samples have shown that PBDE levels are increasing. An analysis of PBDE content in breast milk samples from Europe, Canada, and the US shows that levels are 40 times higher for North American women than for Swedish women, and that levels in North America are doubling each year.
The multitude of possible endocrine disruptors are technically regulated in the United States by many laws, including: the Toxic Substances Control Act, the Federal Insecticide, Fungicide, and Rodenticide Act, the Food, Drug and Cosmetic Act, the Clean Water Act, the Safe Drinking Water Act, and the Clean Air Act.
The Congress of the United States has improved the evaluation and regulation process of drugs and other chemicals. The Food Quality Protection Act of 1996 and the Safe Drinking Water Act of 1996 simultaneously provided the first legislative direction requiring the EPA to address endocrine disruption through establishment of a program for screening and testing of chemical substances.
In 1998 the EPA announced the Endocrine Disruptor Screening Program by establishment of a framework for priority setting, screening and testing more than 85,000 chemicals in commerce. The basic concept behind the program is that prioritization will be based on existing information about chemical uses, production volume, structure-activity and toxicity. Screening is done by use of in vitro test systems (by examining, for instance, if an agent interacts with the estrogen receptor or the androgen receptor) and via the use of in animal models, such as development of tadpoles and uterine growth in prepubertal rodents. Full scale testing will examine effects not only in mammals (rats) but also in a number of other species (frogs, fish, birds and invertebrates). Since the theory involves the effects of these substances on a functioning system, animal testing is essential for scientific validity, but has been opposed by animal rights groups. Similarly, proof that these effects occur in humans would require human testing, and such testing also has opposition.
After failing to meet several deadlines to begin testing, the EPA finally announced that they were ready to begin the process of testing dozens of chemical entities that are suspected endocrine disruptors early in 2007, eleven years after the program was announced. When the final structure of the tests was announced there was objection to their design. Critics have charged that the entire process has been compromised by chemical company interference. In 2005, the EPA appointed a panel of experts to conduct an open peer-review of the program and its orientation. Their results found that "the long-term goals and science questions in the EDC program are appropriate", however this study was conducted over a year before the EPA announced the final structure of the screening program.
Environmental and human body cleanup
There is evidence that once a pollutant is no longer in use, or once its use is heavily restricted, the human body burden of that pollutant declines. Through the efforts of several large-scale monitoring programs, the most prevalent pollutants in the human population are fairly well known. The first step in reducing the body burden of these pollutants is eliminating or phasing out their production.
The second step toward lowering human body burden is awareness of and potentially labeling foods that are likely to contain high amounts of pollutants. This strategy has worked in the past - pregnant and nursing women are cautioned against eating seafood that is known to accumulate high levels of mercury. Ideally,[according to whom?] a certification process should be in place to routinely test animal products for POP concentrations. This would help the consumer identify which foods have the highest levels of pollutants.
The most challenging aspect of this problem is discovering how to eliminate these compounds from the environment and where to focus remediation efforts. Even pollutants no longer in production persist in the environment, and bio-accumulate in the food chain. An understanding of how these chemicals, once in the environment, move through ecosystems, is essential to designing ways to isolate and remove them. Working backwards through the food chain may help to identify areas to prioritize for remediation efforts. This may be extremely challenging for contaminated fish and marine mammals that have a large habitat and who consume fish from many different areas throughout their lives.
Many persistent organic compounds, PCB, DDT and PBDE included, accumulate in river and marine sediments. Several processes are currently being used by the EPA to clean up heavily polluted areas, as outlined in their Green Remediation program.
One of the most interesting ways is the utilization of naturally occurring microbes that degrade PCB congeners to remediate contaminated areas.
There are many success stories of cleanup efforts of large heavily contaminated Superfund sites. A 10-acre (40,000 m2) landfill in Austin, Texas contaminated with illegally dumped VOCs was restored in a year to a wetland and educational park.
A US uranium enrichment site that was contaminated with uranium and PCBs was cleaned up with high tech equipment used to find the pollutants within the soil. The soil and water at a polluted wetlands site were cleaned of VOCs, PCBs and lead, native plants were installed as biological filters, and a community program was implemented to ensure ongoing monitoring of pollutant concentrations in the area. These case studies are encouraging due to the short amount of time needed to remediate the site and the high level of success achieved.
- Staff, NIEHS. Last Reviewed, June 05, 2013. Endocrine Disruptors
- "Findings of scientific misconduct". NIH Guide Grants Contracts: NOT–OD–02–003. October 2001. PMID 12449946.
- Crisp TM, Clegg ED, Cooper RL, Wood WP, Anderson DG, Baetcke KP, Hoffmann JL, Morrow MS, Rodier DJ, Schaeffer JE, Touart LW, Zeeman MG, Patel YM (1998). "Environmental endocrine disruption: An effects assessment and analysis". Environ. Health Perspect. 106. (Suppl 1): 11–56. PMC 1533291. PMID 9539004.
- Krimsky S (December 2001). "An epistemological inquiry into the endocrine disruptor thesis". Ann. N. Y. Acad. Sci. 948 (1): 130–42. doi:10.1111/j.1749-6632.2001.tb03994.x. PMID 11795392.
- Diamanti-Kandarakis E, Bourguignon JP, Giudice LC, Hauser R, Prins GS, Soto AM, Zoeller RT, Gore AC (June 2009). "Endocrine-disrupting chemicals: an Endocrine Society scientific statement". Endocr. Rev. 30 (4): 293–342. doi:10.1210/er.2009-0002. PMC 2726844. PMID 19502515.
- "Endocrine Disrupting Compounds". National Institutes of Health · U.S. Department of Health and Human Services.
- "Executive Summary" (PDF). Global assessment of the state-of-the-science of endocrine disruptors. International Programme on Chemical Safety, World Health Organization. 2002. Retrieved 2007-02-28. "An endocrine disruptor is an exogenous substance or mixture that alters function(s) of the endocrine system and consequently causes adverse health effects in an intact organism, or its progeny, or (sub)populations."
- Colborn T, vom Saal FS, Soto AM (October 1993). "Developmental effects of endocrine-disrupting chemicals in wildlife and humans". Environ. Health Perspect. 101 (5): 378–84. doi:10.2307/3431890. JSTOR 3431890. PMC 1519860. PMID 8080506.
- Grady D (2010-09-06). "In Feast of Data on BPA Plastic, No Final Answer". New York Times. "A fierce debate has resulted, with some dismissing the whole idea of endocrine disruptors."
- Bern HA, Blair P, Brasseur S, Colborn T, Cunha GR, Davis W, Dohler KD, Fox G, Fry M, Gray E, Green R, Hines M, Kubiak TJ, McLachlan J, Myers JP, Peterson RE, Reijnders P.J.H., Soto A, Van Der Kraak G, vom Saal F, Whitten P (1992). "Statement from the Work Session on Chemically-Induced Alterations in Sexual Development: The Wildlife/Human Connection". In Clement C, Colborn T. Chemically-induced alterations in sexual and functional development-- the wildlife/human connection. Princeton, N.J: Princeton Scientific Pub. Co. pp. 1–8. ISBN 0-911131-35-3.
- Bantle J, Bowerman WW IV, Carey C, Colborn T, Deguise S, Dodson S, Facemire CF, Fox G, Fry M, Gilbertson M, Grasman K, Gross T, Guillette L Jr., Henny C, Henshel DS, Hose JE, Klein PA, Kubiak TJ, Lahvis G, Palmer B, Peterson C, Ramsay M, White D (May 1995). "Statement from the Work Session on Environmentally induced Alterations in Development: A Focus on Wildlife". Environ. Health Perspect. 103 (Suppl 4): 3–5. doi:10.2307/3432404. PMC 1519268. PMID 17539108.
- Benson WH, Bern HA, Bue B, Colborn T, Cook P, Davis WP, Denslow N, Donaldson EM, Edsall CC, Fournier M, Gilbertson M, Johnson R, Kocan R, Monosson E, Norrgren L, Peterson RE, Rolland R, Smolen M, Spies R, Sullivan C, Thomas P, Van Der Kraak G (1997). "Statement from the work session on chemically induced alterations in functional development and reproduction of fishes". In Rolland RM, Gilbertson M, Peterson RE. Chemically Induced Alterations in Functional Development and Reproduction of Fishes. Society of Environmental Toxicology & Chemist. pp. 3–8. ISBN 1-880611-19-8.
- Alleva E, Brock J, Brouwer A, Colborn T, Fossi MC, Gray E, Guillette L, Hauser P, Leatherland J, MacLusky N, Mutti A, Palanza P, Parmigiani S, Porterfield, Santi R, Stein SA, vom Saal F (1998). "Statement from the work session on environmental endocrine-disrupting chemicals: neural, endocrine, and behavioral effects". Toxicol Ind Health 14 (1–2): 1–8. PMID 9460166.
- Brock J, Colborn T, Cooper R, Craine DA, Dodson SFM, Garry VF, Gilbertson M, Gray E, Hodgson E, Kelce W, Klotz D, Maciorowski AF, Olea N, Porter W, Rolland R, Scott GI, Smolen M, Snedaker SC, Sonnenschein C, Vyas NB, Welshons WV, Whitcomb CE (1999). "Statement from the Work Session on Health Effects of Contemporary-Use Pesticides: the Wildlife / Human Connection". Toxicol Ind Health 15 (1–2): 1–5.
- Diamanti-Kandarakis E, Bourguignon JP, Giudice LC, Hauser R, Prins GS, Soto AM, Zoeller RT, Gore AC (June 2009). "Endocrine-disrupting chemicals: an Endocrine Society scientific statement". Endocr. Rev. 30 (4): 293–342. doi:10.1210/er.2009-0002. PMC 2726844. PMID 19502515.
- "Position statement: Endocrine-disrupting chemicals". Endocrine News 34 (8): 24–27. 2009.
- Visser MJ. "Cold, Clear, and Deadly". Retrieved 2012-04-14.
- Damstra T, Barlow S Bergman A, Kavlock R, Van der Kraak G (2002). "REPIDISCA-Global assessment of the state-of-the-science of endocrine disruptors". International programme on chemical safety, World Health Organization. Retrieved 2009-03-14.
- Harrison PTC, Humfrey CDN, Litchfield M, Peakall D, Shuker LK (1995). "Environmental oestrogens: consequences to human health and wildlife". IEH assessment. Medical Research Council, Institute for Environment and Health. Retrieved 2009-03-14.
- "EDC Human Effects". e.hormone. Center for Bioenvironmental Research at Tulane and Xavier Universities. Retrieved 2009-03-14.
- Golden RJ, Noller KL, Titus-Ernstoff L, Kaufman RH, Mittendorf R, Stillman R, Reese EA (March 1998). "Environmental endocrine modulators and human health: an assessment of the biological evidence". Crit. Rev. Toxicol. 28 (2): 109–227. doi:10.1080/10408449891344191. PMID 9557209.
- Willis IC (2007). Progress in Environmental Research. New York: Nova Publishers. p. 176. ISBN 1-60021-618-8.
- WHO | State of the science of endocrine disrupting chemicals - 2012
- Bis-phenol A California Environment www.environmentcalifornia.org/environmental-health/stop-toxic-toys/bisphenol-a-overview
- Guo YL, Lambert GH, Hsu CC (September 1995). "Growth abnormalities in the population exposed in utero and early postnatally to polychlorinated biphenyls and dibenzofurans". Environ. Health Perspect. 103. Suppl 6: 117–22. doi:10.2307/3432359. JSTOR 3432359. PMC 1518940. PMID 8549457.
- Bigsby R, Chapin RE, Daston GP, Davis BJ, Gorski J, Gray LE, Howdeshell KL, Zoeller RT, vom Saal FS (August 1999). "Evaluating the effects of endocrine disruptors on endocrine function during development". Environ. Health Perspect. 107. Suppl 4: 613–8. doi:10.2307/3434553. JSTOR 3434553. PMC 1567510. PMID 10421771.
- Castro DJ, Löhr CV, Fischer KA, Pereira CB, Williams DE (December 2008). "Lymphoma and lung cancer in offspring born to pregnant mice dosed with dibenzo[a,l]pyrene: the importance of in utero vs. lactational exposure". Toxicol. Appl. Pharmacol. 233 (3): 454–8. doi:10.1016/j.taap.2008.09.009. PMC 2729560. PMID 18848954.
- Eriksson P, Lundkvist U, Fredriksson A (1991). "Neonatal exposure to 3,3',4,4'-tetrachlorobiphenyl: changes in spontaneous behaviour and cholinergic muscarinic receptors in the adult mouse". Toxicology 69 (1): 27–34. doi:10.1016/0300-483X(91)90150-Y. PMID 1926153.
- Recabarren SE, Rojas-García PP, Recabarren MP, Alfaro VH, Smith R, Padmanabhan V, Sir-Petermann T (December 2008). "Prenatal testosterone excess reduces sperm count and motility". Endocrinology 149 (12): 6444–8. doi:10.1210/en.2008-0785. PMID 18669598.
- Szabo DT, Richardson VM, Ross DG, Diliberto JJ, Kodavanti PR, Birnbaum LS (January 2009). "Effects of perinatal PBDE exposure on hepatic phase I, phase II, phase III, and deiodinase 1 gene expression involved in thyroid hormone metabolism in male rat pups". Toxicol. Sci. 107 (1): 27–39. doi:10.1093/toxsci/kfn230. PMC 2638650. PMID 18978342.
- Lilienthal H, Hack A, Roth-Härer A, Grande SW, Talsness CE (February 2006). "Effects of developmental exposure to 2,2 ,4,4 ,5-pentabromodiphenyl ether (PBDE-99) on sex steroids, sexual development, and sexually dimorphic behavior in rats". Environ. Health Perspect. 114 (2): 194–201. doi:10.1289/ehp.8391. PMC 1367831. PMID 16451854.
- ,Talsness CE, Shakibaei M, Kuriyama SN, Grande SW, Sterner-Kock A, Schnitker P, de Souza C, Grote K, Chahoud I (July 2005). "Ultrastructural changes observed in rat ovaries following in utero and lactational exposure to low doses of a polybrominated flame retardant". Toxicol. Lett. 157 (3): 189–202. doi:10.1016/j.toxlet.2005.02.001. PMID 15917144.
- Eriksson P, Viberg H, Jakobsson E, Orn U, Fredriksson A (May 2002). "A brominated flame retardant, 2,2',4,4',5-pentabromodiphenyl ether: uptake, retention, and induction of neurobehavioral alterations in mice during a critical phase of neonatal brain development". Toxicol. Sci. 67 (1): 98–103. doi:10.1093/toxsci/67.1.98. PMID 11961221.
- Viberg H, Johansson N, Fredriksson A, Eriksson J, Marsh G, Eriksson P (July 2006). "Neonatal exposure to higher brominated diphenyl ethers, hepta-, octa-, or nonabromodiphenyl ether, impairs spontaneous behavior and learning and memory functions of adult mice". Toxicol. Sci. 92 (1): 211–8. doi:10.1093/toxsci/kfj196. PMID 16611620.
- Rogan WJ, Ragan NB (July 2003). "Evidence of effects of environmental chemicals on the endocrine system in children". Pediatrics 112 (1 Pt 2): 247–52. doi:10.1542/peds.112.1.S1.247. PMID 12837917.
- Bern HA (November 1992). "The development of the role of hormones in development--a double remembrance". Endocrinology 131 (5): 2037–8. doi:10.1210/en.131.5.2037. PMID 1425407.
- Colborn T, Carroll LE (2007). "Pesticides, sexual development, reproduction, and fertility: current perspective and future". Human and Ecological Risk Assessment 13 (5): 1078–1110. doi:10.1080/10807030701506405.
- Collaborative on Health and the Environment’s Learning and Developmental Disabilities Initiative (2008-07-01). "Scientific Consensus Statement on Environmental Agents Associated with Neurodevelopmental Disorders". Institute for Children's Environmental Health. Retrieved 2009-03-14.
- Swan SH, Main KM, Liu F, Stewart SL, Kruse RL, Calafat AM, Mao CS, Redmon JB, Ternand CL, Sullivan S, Teague JL (August 2005). "Decrease in anogenital distance among male infants with prenatal phthalate exposure". Environ. Health Perspect. 113 (8): 1056–61. doi:10.1289/ehp.8100. PMC 1280349. PMID 16079079.
- McEwen GN, Renner G (January 2006). "Validity of anogenital distance as a marker of in utero phthalate exposure". Environ. Health Perspect. 114 (1): A19–20; author reply A20–1. doi:10.1289/ehp.114-a19b. PMC 1332693. PMID 16393642.
- Postellon DC (June 2008). "Baby care products". Pediatrics 121 (6): 1292; author reply 1292–3. doi:10.1542/peds.2008-0401. PMID 18519505.
- Romano-Riquer SP, Hernández-Avila M, Gladen BC, Cupul-Uicab LA, Longnecker MP (May 2007). "Reliability and determinants of anogenital distance and penis dimensions in male newborns from Chiapas, Mexico". Paediatr Perinat Epidemiol 21 (3): 219–28. doi:10.1111/j.1365-3016.2007.00810.x. PMID 17439530.
- Vandenberg, LN et al (2009) Bisphenol-A and the Great Divide: A Review of Controversies in the Field of Endocrine Disruption Endocr Rev. 30(1): 75–95.
- Cooper RL, Kavlock RJ (February 1997). "Endocrine disruptors and reproductive development: a weight-of-evidence overview". J. Endocrinol. 152 (2): 159–66. doi:10.1677/joe.0.1520159. PMID 9071972.
- Safe SH (June 2000). "Endocrine disruptors and human health--is there a problem? An update". Environ. Health Perspect. (Brogan &) 108 (6): 487–93. doi:10.2307/3454608. JSTOR 3454608. PMC 1638151. PMID 10856020.
- Talsness CE, Kuriyama SN, Sterner-Kock A, Schnitker P, Grande SW, Shakibaei M, Andrade A, Grote K, Chahoud I (March 2008). "In utero and lactational exposures to low doses of polybrominated diphenyl ether-47 alter the reproductive system and thyroid gland of female rat offspring". Environ. Health Perspect. 116 (3): 308–14. doi:10.1289/ehp.10536. PMC 2265047. PMID 18335096.
- Arnold SF, Klotz DM, Collins BM, Vonier PM, Guillette LJ, McLachlan JA (June 1996). "Synergistic activation of estrogen receptor with combinations of environmental chemicals". Science 272 (5267): 1489–92. doi:10.1126/science.272.5267.1489. PMID 8633243. (Retracted)
- "W. Alton Jones Foundation helps to fund hundreds of environmental groups". klamathbasincrisis.org. 2007-07-20. Retrieved 2009-03-14.
- Ramamoorthy K, Wang F, Chen IC, Norris JD, McDonnell DP, Leonard LS, Gaido KW, Bocchinfuso WP, Korach KS, Safe S (April 1997). "Estrogenic activity of a dieldrin/toxaphene mixture in the mouse uterus, MCF-7 human breast cancer cells, and yeast-based estrogen receptor assays: no apparent synergism". Endocrinology 138 (4): 1520–7. doi:10.1210/en.138.4.1520. PMID 9075711.
- McLachlan JA (July 1997). "Synergistic effect of environmental estrogens: report withdrawn". Science 277 (5325): 462–3. doi:10.1126/science.277.5325.459. PMID 9254413.
- Hayes TB, Case P, Chui S, Chung D, Haeffele C, Haston K, Lee M, Mai VP, Marjuoa Y, Parker J, Tsui M (April 2006). "Pesticide mixtures, endocrine disruption, and amphibian declines: are we underestimating the impact?". Environ. Health Perspect. 114 (S–1): 40–50. doi:10.1289/ehp.8051. PMC 1874187. PMID 16818245.
- Low Dose Makes the Poison. Living on Earth, 4 Sep 2009.
- Fürst P (October 2006). "Dioxins, polychlorinated biphenyls and other organohalogen compounds in human milk. Levels, correlations, trends and exposure through breastfeeding". Mol Nutr Food Res 50 (10): 922–33. doi:10.1002/mnfr.200600008. PMID 17009213.
- Schecter A, Päpke O, Tung KC, Staskal D, Birnbaum L (October 2004). "Polybrominated diphenyl ethers contamination of United States food". Environ. Sci. Technol. 38 (20): 5306–11. doi:10.1021/es0490830. PMID 15543730.
- Hites RA, Foran JA, Carpenter DO, Hamilton MC, Knuth BA, Schwager SJ (January 2004). "Global assessment of organic contaminants in farmed salmon". Science 303 (5655): 226–9. doi:10.1126/science.1091447. PMID 14716013.
- Weschler CJ (2009). "Changes in indoor pollutants since the 1950s". Atmospheric Environment 43 (1): 153–169. doi:10.1016/j.atmosenv.2008.09.044.
- Rudel RA, Seryak LM, Brody JG (2008). "PCB-containing wood floor finish is a likely source of elevated PCBs in residents' blood, household air and dust: a case study of exposure". Environ Health 7 (1): 2. doi:10.1186/1476-069X-7-2. PMC 2267460. PMID 18201376.
- Stapleton HM, Dodder NG, Offenberg JH, Schantz MM, Wise SA (February 2005). "Polybrominated diphenyl ethers in house dust and clothes dryer lint". Environ. Sci. Technol. 39 (4): 925–31. doi:10.1021/es0486824. PMID 15773463.
- Anderson HA, Imm P, Knobeloch L, Turyk M, Mathew J, Buelow C, Persky V (September 2008). "Polybrominated diphenyl ethers (PBDE) in serum: findings from a US cohort of consumers of sport-caught fish". Chemosphere 73 (2): 187–94. doi:10.1016/j.chemosphere.2008.05.052. PMID 18599108.
- Morland KB, Landrigan PJ, Sjödin A, Gobeille AK, Jones RS, McGahee EE, Needham LL, Patterson DG (December 2005). "Body burdens of polybrominated diphenyl ethers among urban anglers". Environ. Health Perspect. 113 (12): 1689–92. doi:10.1289/ehp.8138. PMC 1314906. PMID 16330348.
- Lorber M (January 2008). "Exposure of Americans to polybrominated diphenyl ethers". J Expo Sci Environ Epidemiol 18 (1): 2–19. doi:10.1038/sj.jes.7500572. PMID 17426733.
- Lunder S, Jacob A (2008-09-01). "Fire Retardants in Toddlers and Their Mothers". Environmental Working Group. Retrieved 2009-03-14.
- Charney E, Sayre J, Coulter M (February 1980). "Increased lead absorption in inner city children: where does the lead come from?". Pediatrics 65 (2): 226–31. PMID 7354967.
- Dodson RE, Nishioka M, Standley LJ, Perovich LJ, Brody JG, Rudel RA (March 2012). "Endocrine Disruptors and Asthma-Associated Chemicals in Consumer Products". Environ Health Perspect. doi:10.1289/ehp.1104052. PMID 22398195. Lay summary – Journalist's Resource.
- Martina CA, Weiss B, Swan SH (June 2012). "Lifestyle behaviors associated with exposures to endocrine disruptors". Neurotoxicology. doi:10.1016/j.neuro.2012.05.016. PMID 22739065. Lay summary – Science Daily.
- "National Report on Human Exposure to Environmental Chemicals". Centers for Disease Control and Prevention, U.S. Department of Health and Human Services. Retrieved 2009-03-14.
- Solomon GM, Schettler T (November 2000). "Environment and health: 6. Endocrine disruption and potential human health implications". CMAJ 163 (11): 1471–6. PMC 80418. PMID 11192656.
- Sharpe RM, Irvine DS (February 2004). "How strong is the evidence of a link between environmental chemicals and adverse effects on human reproductive health?". BMJ 328 (7437): 447–51. doi:10.1136/bmj.328.7437.447. PMC 344268. PMID 14976101.
- Colborn T (June 2004). "Neurodevelopment and endocrine disruption". Environ. Health Perspect. 112 (9): 944–9. PMC 1247186. PMID 15198913.
- "Calif. lawsuit targets baby bottles with chemical additive". FindLaw. 2007-032-8. Retrieved 2009-03-14. [dead link]
- EU bans bisphenol A chemical from babies' bottles. BBC News. 25 November 2010. BBC. "I do not know of any convincing evidence that bisphenol A exposure, in the amounts used in polycarbonate bottles, can cause any harm to babies as not only are the amounts so minuscule but they are rapidly broken down in the gut and liver."
- Kochukov, Y.; Jeng, J.; Watson, S. (May 2009). "Alkylphenol xenoestrogens with varying carbon chain lengths differentially and potently activate signaling and functional responses in GH3/B6/F10 somatomammotropes". Environmental health perspectives 117 (5): 723–730. doi:10.1289/ehp.0800182. ISSN 0091-6765. PMC 2685833. PMID 19479013.
- European Bans on Surfactant Trigger Transatlantic Debate
- "Receipts a large — and largely ignored — source of BPA". Science News 178 (5): 5. August 2010.
- Gore AC. Endocrine-Disrupting Chemicals: From Basic Research to Clinical Practice (Contemporary Endocrinology). Totowa, NJ: Humana Press; 2007. (Contemporary Endocrinology). ISBN 1-58829-830-2.
- O’Connor JC, Chapin RE. Critical evaluation of observed adverse effects of endocrine active substances on reproduction and development, the immune system, and the nervous system. Pure Appl. Chem. 2003;75(11–12):2099–2123. doi:10.1351/pac200375112099.
- Okada H, Tokunaga T, Liu X, Takayanagi S, Matsushima A, Shimohigashi Y. Direct evidence revealing structural elements essential for the high binding ability of bisphenol A to human estrogen-related receptor-gamma. Environ. Health Perspect.. 2008;116(1):32–8. doi:10.1289/ehp.10587. PMID 18197296.
- vom Saal FS, Myers JP. Bisphenol A and Risk of Metabolic Disorders. JAMA. 2008;300(11):1353–5. doi:10.1001/jama.300.11.1353. PMID 18799451.
- Draft Screening Assessment for The Challenge Phenol, 4,4' -(1-methylethylidene)bis- (Bisphenol A)Chemical Abstracts Service Registry Number 80-05-7. Health Canada, 2008.
- Ginsberg G, Rice DC. Does Rapid Metabolism Ensure Negligible Risk from Bisphenol A?. EPH. 2009;117(11):1639–1643. doi:10.1289/ehp.0901010. PMID 20049111.
- Beronius A, Rudén C, Håkansson H, Hanberg A. Risk to all or none? A comparative analysis of controversies in the health risk assessment of Bisphenol A. Reprod. Toxicol.. 2010;29(2):132–46. doi:10.1016/j.reprotox.2009.11.007. PMID 19931376.
- ScienceDaily. 99% of pregnant women in US test positive for multiple chemicals including banned ones, study suggests; 14 January 2011 [Retrieved 1 February 2012].
- Brown, Eryn. "Jury still out on BPA, World Health Organization says", The Los Angeles Times, 11 November 2010. Retrieved on 7 February 2011.
- "Chemical Used in Plastic Bottles Is Safe, F.D.A. Says". New York Times. 2008-08-16. Retrieved 2009-03-14.
- Szabo L (2008-11-01). "Advisers: FDA decision on safety of BPA 'flawed'". USA Today. Retrieved 2009-03-14.
- "Bisphenol A (BPA): Use in Food Contact Application". News & Events. United States Food & Drug Administration. 2012-03-30. Retrieved 2012-04-14.
- FDA to Ban BPA from Baby Bottles; Plan Falls Short of Needed Protections: Scientists | Common Dreams
- FDA Bans BPA From Baby Bottles And Sippy Cups
- Soares A, Guieysse B, Jefferson B, Cartmell E, Lester JN (October 2008). "Nonylphenol in the environment: a critical review on occurrence, fate, toxicity and treatment in wastewaters". Environ Int 34 (7): 1033–49. doi:10.1016/j.envint.2008.01.004. PMID 18282600.
- "Statewide Endocrine Disrupting Compound Monitoring Study, 2007 - 2008". Minnesota Pollution Control Agency.
- Davis KS (1971). "The deadly dust: the unhappy history of DDT". American Heritage Magazine 22 (2).
- "Stockholm Convention on Persistent Organic Pollutants".
- Lundholm CD (October 1997). "DDE-induced eggshell thinning in birds: effects of p,p'-DDE on the calcium and prostaglandin metabolism of the eggshell gland". Comp. Biochem. Physiol. C, Pharmacol. Toxicol. Endocrinol. 118 (2): 113–28. doi:10.1016/S0742-8413(97)00105-9. PMID 9490182.
- Szlinder-Richert J, Barska I, Mazerski J, Usydus Z (May 2008). "Organochlorine pesticides in fish from the southern Baltic Sea: levels, bioaccumulation features and temporal trends during the 1995-2006 period". Mar. Pollut. Bull. 56 (5): 927–40. doi:10.1016/j.marpolbul.2008.01.029. PMID 18407298.
- Peterle TJ (November 1969). "DDT in Antarctic snow". Nature 224 (5219): 620. doi:10.1038/224620a0. PMID 5346606.
- Daly GL, Wania F (January 2005). "Organic contaminants in mountains". Environ. Sci. Technol. 39 (2): 385–98. doi:10.1021/es048859u. PMID 15707037.
- Tauber OE, Hughes AB (November 1950). "Effect of DDT ingestion on total cholesterol content of ovaries of white rat". Proc. Soc. Exp. Biol. Med. 75 (2): 420–2. PMID 14808278.
- Stoner HB (December 1953). "Effect of 2,2-bis (parachlorophenyl)-1,1-dichloroethane (DDD) on the adrenal cortex of the rat". Nature 172 (4388): 1044–5. doi:10.1038/1721044a0. PMID 13111250.
- Tiemann U (April 2008). "In vivo and in vitro effects of the organochlorine pesticides DDT, TCPM, methoxychlor, and lindane on the female reproductive tract of mammals: a review". Reprod. Toxicol. 25 (3): 316–26. doi:10.1016/j.reprotox.2008.03.002. PMID 18434086.
- Hallegue D, Rhouma KB, Tébourbi O, Sakly M (April 2003). "Impairment of Testicular Endocrine and Exocrine Functions after Dieldrin Exposure in Adult Rats". Polish Journal of Environmental Studies 12 (5): 557–562.
- Verhulst SL, Nelen V, Hond ED, Koppen G, Beunckens C, Vael C, Schoeters G, Desager K (January 2009). "Intrauterine exposure to environmental pollutants and body mass index during the first 3 years of life". Environ. Health Perspect. 117 (1): 122–6. doi:10.1289/ehp.0800003. PMC 2627855. PMID 19165398.
- Francis E (1994-09-01). "March/April 2001 Sierra Magazine - Sierra Club". Sierra Magazine. Retrieved 2009-03-14.
- "Fox River History of PCBs". Fox River Watch. Clean Water Action Council. Retrieved 2009-03-14.
- Jensen S, Johnels AG, Olsson M, Otterlind G (October 1969). "DDT and PCB in marine animals from Swedish waters". Nature 224 (5216): 247–50. doi:10.1038/224247a0. PMID 5388040.
- Tang NJ, Liu J, Coenraads PJ, Dong L, Zhao LJ, Ma SW, Chen X, Zhang CM, Ma XM, Wei WG, Zhang P, Bai ZP (April 2008). "Expression of AhR, CYP1A1, GSTA1, c-fos and TGF-alpha in skin lesions from dioxin-exposed humans with chloracne". Toxicol. Lett. 177 (3): 182–7. doi:10.1016/j.toxlet.2008.01.011. PMID 18329192.
- Loomis D, Browning SR, Schenck AP, Gregory E, Savitz DA (October 1997). "Cancer mortality among electric utility workers exposed to polychlorinated biphenyls". Occup Environ Med 54 (10): 720–8. doi:10.1136/oem.54.10.720. PMC 1128926. PMID 9404319.
- Brown DP (1987). "Mortality of workers exposed to polychlorinated biphenyls--an update". Arch. Environ. Health 42 (6): 333–9. doi:10.1080/00039896.1987.9934355. PMID 3125795.
- Sinks T, Steele G, Smith AB, Watkins K, Shults RA (August 1992). "Mortality among workers exposed to polychlorinated biphenyls". Am. J. Epidemiol. 136 (4): 389–98. PMID 1415158.
- Grunwald M (2002-01-01). "Monsanto Hid Decades Of Pollution". Washington Post. Retrieved 2009-03-14.
- "Polychlorinated biphenyls and terphenyls (EHC 2, 1976)". International Programme on Chemical Safety. Retrieved 2009-03-14.
- Kodavanti PR (2006). "Neurotoxicity of Persistent Organic Pollutants: Possible Mode(s) of Action and Further Considerations". Dose Response 3 (3): 273–305. doi:10.2203/dose-response.003.03.002. PMC 2475949. PMID 18648619.
- Uemura H, Arisawa K, Hiyoshi M, Satoh H, Sumiyoshi Y, Morinaga K, Kodama K, Suzuki T, Nagai M, Suzuki T (September 2008). "Associations of environmental exposure to dioxins with prevalent diabetes among general inhabitants in Japan". Environ. Res. 108 (1): 63–8. doi:10.1016/j.envres.2008.06.002. PMID 18649880.
- Mullerova D, Kopecky J, Matejkova D, Muller L, Rosmus J, Racek J, Sefrna F, Opatrna S, Kuda O, Matejovic M (December 2008). "Negative association between plasma levels of adiponectin and polychlorinated biphenyl 153 in obese women under non-energy-restrictive regime". Int J Obes (Lond) 32 (12): 1875–8. doi:10.1038/ijo.2008.169. PMID 18825156.
- Effects of human exposure to hormone-disrupting chemicals examined in landmark United Nations report
- Eriksson P, Fischer C, Fredriksson A (December 2006). "Polybrominated diphenyl ethers, a group of brominated flame retardants, can interact with polychlorinated biphenyls in enhancing developmental neurobehavioral defects". Toxicol. Sci. 94 (2): 302–9. doi:10.1093/toxsci/kfl109. PMID 16980691.
- "The history of plastic". Plastics Division. American Chemistry Council. Retrieved 2009-03-14.
- "The Evolution of Durable Press and Flame Retardant Cotton". American Chemical Society. Retrieved 2009-03-14.
- Epidemiology and Statistics Unit (2008-07-01). "Trends in Tobacco Use". American Lung Association. Retrieved 2009-03-14.[dead link]
- Karter MJ (2008-08-01). "Fire Loss In The United States 2007". National Fire Protection Association. Retrieved 2009-03-14.
- "America Burning". U.S. Fire Administration. 1973-05-04. Retrieved 2009-03-14.
- "Flame retardants (EHC 192, 1997)". Environmental Health Criteria No. 192. International Programme on Chemical Safety, World Health Organization. 1997. Retrieved 2009-03-14.
- "Great Lakes Chemical Corporation -- Company History". Retrieved 2009-03-14.
- "Toxicological review of decabromodiphenyl ether (BDE-209)". U.S. Environmental Protection Agency. 20098-06-01. Retrieved 2009-03-14. [dead link]
- "toxicological review of 2,2',4,4'-tetrabromodiphenyl ether (BDE-47)". U.S. Environmental Protection Agency. 2008-06-01. Retrieved 2009-03-14.[dead link]
- Betts KS (May 2008). "New thinking on flame retardants". Environ. Health Perspect. 116 (5): A210–3. doi:10.1289/ehp.116-a210. PMC 2367656. PMID 18470294.
- Costa LG, Giordano G (November 2007). "Developmental neurotoxicity of polybrominated diphenyl ether (PBDE) flame retardants". Neurotoxicology 28 (6): 1047–67. doi:10.1016/j.neuro.2007.08.007. PMC 2118052. PMID 17904639.
- Lema SC, Dickey JT, Schultz IR, Swanson P (December 2008). "Dietary exposure to 2,2',4,4'-tetrabromodiphenyl ether (PBDE-47) alters thyroid status and thyroid hormone-regulated gene transcription in the pituitary and brain". Environ. Health Perspect. 116 (12): 1694–9. doi:10.1289/ehp.11570. PMC 2599765. PMID 19079722.
- Fisher JS (March 2004). "Environmental anti-androgens and male reproductive health: focus on phthalates and testicular dysgenesis syndrome". Reproduction 127 (3): 305–15. doi:10.1530/rep.1.00025. PMID 15016950.
- Barrett, JR (2005). "Phthalates and Baby Boys: Potential Disruption of Human Genital Development". Environmental Health Perspective (Brogan &) 113 (8): 542–542. doi:10.1289/ehp.113-a542a. JSTOR 3436340.
- Kaiser J (October 2005). "Toxicology. Panel finds no proof that phthalates harm infant reproductive systems". Science 310 (5747): 422. doi:10.1126/science.310.5747.422a. PMID 16239449.
- "California OKs phthalates ban on children's products". Thomson Reuters. 2007-10-15. Retrieved 2009-03-14.
- Hileman B (2007-10-17). "California Bans Phthalates In Toys For Children". Chemical & Engineering News. Retrieved 2009-03-14.
- Feigal DW (2002-07-12). "PVC Devices Containing the Plasticizer DEHP". US FDA/CDRH: FDA Public Health Notification. Food and Drug Administration. Retrieved 2009-03-14.
- Swan SH, Liu F, Hines M, Kruse RL, Wang C, Redmon JB, Sparks A, Weiss B (November 2009). "Prenatal phthalate exposure and reduced masculine play in boys". Int. J. Androl. 33 (2): 259–69. doi:10.1111/j.1365-2605.2009.01019.x. PMC 2874619. PMID 19919614.
- Tumburu L, Shepard EF, Strand AE, Browdy CL (November 2011). "Effects of endosulfan exposure and Taura Syndrome Virus infection on the survival and molting of the marine penaeid shrimp, Litopenaeus vannamei". Chemosphere 86 (9): 912–8. doi:10.1016/j.chemosphere.2011.10.057. PMID 22119282.
- Knobeloch L, Turyk M, Imm P, Schrank C, Anderson H (January 2009). "Temporal changes in PCB and DDE levels among a cohort of frequent and infrequent consumers of Great Lakes sportfish". Environ. Res. 109 (1): 66–72. doi:10.1016/j.envres.2008.08.010. PMID 18950754.
- Norén K, Meironyté D (2000). "Certain organochlorine and organobromine contaminants in Swedish human milk in perspective of past 20-30 years". Chemosphere 40 (9–11): 1111–23. doi:10.1016/S0045-6535(99)00360-4. PMID 10739053.
- Hites RA (February 2004). "Polybrominated diphenyl ethers in the environment and in people: a meta-analysis of concentrations". Environ. Sci. Technol. 38 (4): 945–56. doi:10.1021/es035082g. PMID 14998004.
- Betts KS (February 2002). "Rapidly rising PBDE levels in North America". Environ. Sci. Technol. 36 (3): 50A–52A. doi:10.1021/es022197w. PMID 11871568.
- Ambrose SG (2007-05-27). "Scientists criticize EPA chemical screening program". Dallas Morning News. Retrieved 2009-03-14.
- Harding AK, Daston GP, Boyd GR, Lucier GW, Safe SH, Stewart J, Tillitt DE, Van Der Kraak G (August 2006). "Endocrine disrupting chemicals research program of the U.S. Environmental Protection Agency: summary of a peer-review report". Environ. Health Perspect. 114 (8): 1276–82. doi:10.1289/ehp.8875. PMC 1552001. PMID 16882539.
- "National Report on Human Exposure to Environmental Chemicals". Centers for Disease Control and Prevention, Department of Health and Human Services. Retrieved 2009-03-14.
- "California Biomonitoring Program". State of California. Retrieved 2009-03-14.
- "Green Remediation". United States Environmental Protection Agency. Retrieved 2009-03-14.
- Field JA, Sierra-Alvarez R (September 2008). "Microbial transformation and degradation of polychlorinated biphenyls". Environ. Pollut. 155 (1): 1–12. doi:10.1016/j.envpol.2007.10.016. PMID 18035460.
- "Profiles of Green Strategies: Rhizome Collective Inc. Brownfield Site, Austin, TX". Green Remediation. United States Environmental Protection Agency. Retrieved 2009-03-14.
- "Profiles & Case Studies of Green Remediation: Paducah Gaseous Diffusion Plant, Paducah, KY". Green Remediation. United States Environmental Protection Agency. Retrieved 2009-03-14.
- "Case Studies of Green Remediation: Re-Solve, Inc., North Dartmouth, MA". Green Remediation. United States Environmental Protection Agency. Retrieved 2009-03-14.
- Krimsky S (2000). Hormonal chaos: the scientific and social origins of the environmental endocrine hypothesis. Baltimore: Johns Hopkins University Press. ISBN 0-8018-6279-5.
- Bergman, Åke; Heindel, Jerrold J.; Jobling, Susan; Kidd, Karen A.; Zoeller, R. Thomas, eds. (2013). State of the Science of Endocrine Disrupting Chemicals - 2012. United Nations Environment Programme and the World Health Organization. ISBN 978-92-807-3274-0. and ISBN 978-92-4-150503-1
- Theo Colborn, Dianne Dumanoski and John Peter Meyers (1996). Our stolen future: are we threatening our fertility, intelligence, and survival?: a scientific detective story. New York: Dutton. ISBN 0525939822. ISBN 0452274141 (1997).
- "Global assessment of the state-of-the-science of endocrine disruptors". International Programme on Chemical Safety. World Health Organization. 2002. Retrieved 2009-03-14.
- "Endocrine Disrupting Chemicals". Center for Bioenvironmental Research at Tulane and Xavier Universities. Retrieved 2009-03-14. "NSF sponsored Environmental Signalling Network's website"
- "EUROPA - Environment - Endocrine disrupters". European Commission. Retrieved 2009-03-14. "The EU strategy on EDCs"
- "Endocrine Disruptor Screening Program". United States Environmental Protection Agency. Retrieved 2009-03-14. "US EPA (strategy) on EDCs"
- Connor EL (2008-03-20). "Endocrine Disruptors: Fact vs. Fad - IME Video Library". University of Wisconsin - Madison Health Sciences Learning Center. Retrieved 2009-03-14.
- Botham C, Holmes P (2005-03-01). "Chemicals purported to be endocrine disruptors: A complication of published lists". Leicester, UK, MRC Institute for Environment and Health. Retrieved 2009-03-14.
- "Our Stolen Future". www.OurStolenFuture.org. Retrieved 2009-03-14. "Synopses of new scientific findings about endocrine disruption"
- Daly G (2006). "OnEarth Magazine, Winter 2006 - Bad Chemistry: A Special Report". Natural Resources Defense Council. Retrieved 2009-03-14.
- Hamilton D (1998). "Fooling with nature: interviews: Theo Colborn". Frontline. The Public Broadcasting system and WGBH Boston Educational Foundation. Retrieved 2009-03-14.
- "Sex-change chemicals in Potomac". BBC News. 2007-01-18. Retrieved 2009-03-14.