Current chemical testing missing low-dosage effects of endocrine-disrupting chemicals
Endocrine-disrupting chemicals (EDCs) -- such as BPA -- can show tangible effects on health endpoints at high dosage levels, yet those effects do not predict how EDCs will affect the endocrine system at low doses, according to a recent study accepted for publication in The Endocrine Society's Endocrine Reviews. Study authors say current definitions of low-dosage as used by the U.S. Environmental Protection Agency (EPA) do not fully take into account the unique influence that low doses of EDCs have on disease development in humans.
Endocrine-disrupting chemicals are substances in the environment that interfere with hormone biosynthesis, metabolism or action resulting in adverse developmental, reproductive, neurological and immune effects in both humans and wildlife. The current report found that low doses of EDCs, which are comparable to the average person's environmental exposure to these chemicals, can result in significant health effects.
"Whether low doses of EDCs influence disorders in humans is no longer conjecture as epidemiological studies show that environmental exposures to EDCs are associated with human diseases and disabilities," said Laura Vandenberg of Tufts University in Medford, Mass. and lead author of the study. "Current testing paradigms are missing important, sensitive endpoints and fundamental changes in chemical testing and safety determination are needed to protect human health."
In this study, researchers reviewed the current EDC literature and explored the relationships between dose and effect. They found that this relationship could be non-linear; meaning that EDCs effect on the body varied within the range of doses examined. The report provides a detailed discussion on the mechanisms responsible for generating this phenomenon, plus hundreds of examples from the cell culture, animal and epidemiology literature.
"Low-dose effects are remarkably common in studies of natural hormones and EDCs," said Vandenberg. "We recommend greatly expanded and generalized safety testing and surveillance to detect potential adverse effects of this broad class of chemicals. Before new chemicals are developed, a wider range of doses, extending into the low-dose range, should be fully tested."
More information: The article, "Hormones and Endocrine-Disrupting Chemicals: Low-Dose Effects and Nonmonotonic Dose Responses," appears in the June 2012 issue of Endocrine Reviews.
Provided by The Endocrine Society
- Endocrine-disrupting chemicals pose cancer risk May 25, 2010 | not rated yet | 0
- Homes of the poor and the affluent both have high levels of endocrine disruptors Aug 04, 2010 | not rated yet | 0
- Research proves 'gender-bending' chemicals affect reproduction Oct 26, 2010 | not rated yet | 0
- Suggested link between The Pill and prostate cancer Dec 01, 2011 | not rated yet | 0
- Prenatal exposure to endocrine-disrupting chemicals linked to breast cancer May 21, 2010 | not rated yet | 0
- Motion perception revisited: High Phi effect challenges established motion perception assumptions Apr 23, 2013 | 3 / 5 (2) | 2
- Anything you can do I can do better: Neuromolecular foundations of the superiority illusion (Update) Apr 02, 2013 | 4.5 / 5 (11) | 5
- The visual system as economist: Neural resource allocation in visual adaptation Mar 30, 2013 | 5 / 5 (2) | 9
- Separate lives: Neuronal and organismal lifespans decoupled Mar 27, 2013 | 4.9 / 5 (8) | 0
- Sizing things up: The evolutionary neurobiology of scale invariance Feb 28, 2013 | 4.8 / 5 (10) | 14
5 hours ago Alright, so in Pathfinder (like Dungeons and Dragons) there's a spell that allows you to lift/move stuff within 25 ft with 5 pounds of force. A...
8 hours ago So energy can only be converted... So when you squeeze the bulb on a blood pressure cuff, you are applying kinetic energy. Then the cuff fills with...
How does momentum, inertia and drag affect the motion of an object?
10 hours ago How does momentum and inertia affect changes in speed, when considering acceleration from thrust, or from decelleration from drag? Say, for a...
What is Time-Varying Voltage?
11 hours ago In circuits, we have no problem saying that the voltage difference between two point is [itex]\cos(\omega t)[/itex], but what does that actually...
Contextual Relationships Between Momentum, Energy, and Force.
13 hours ago *I apologize in advance for the length of this post, if you wish to reduce reading skip to paragraph 5. Or if you are super lazy, the final...
Barometric pressure and the math behind it. Very interesting, I think.
14 hours ago Hey guys, I was actually researching the life of Edmond Halley and discovered that he discovered the relationship between barometric pressure and the...
- More from Physics Forums - Classical Physics
More news stories
Raising hopes for cell-based therapies, UC San Francisco researchers have created the first functioning human thymus tissue from embryonic stem cells in the laboratory. The researchers showed that, in mice, ...
Immunology May 16, 2013 | 4.8 / 5 (5) | 0 |
Researchers from CNRS, Université Toulouse III - Paul Sabatier and IRD have elucidated new molecular mechanisms involved in resistance to visceral leishmaniasis, a serious parasitic infection. They have shown that dectin-1 ...
Immunology May 16, 2013 | not rated yet | 0
Women's immune systems age more slowly than men's, suggests research in BioMed Central's open access journal Immunity & Ageing. The slower decline in a woman's immune system may contribute to women living longer than men. ...
Immunology May 14, 2013 | not rated yet | 0
Newly described type of immune cell and T cells share similar path to maturity, according to new study
(Medical Xpress)—Labs around the world, and a core group at Penn, have been studying recently described populations of immune cells called innate lymphoid cells (ILCs). Some researchers liken them to foot soldiers that ...
Immunology May 14, 2013 | 5 / 5 (3) | 0 |
(Medical Xpress)—Cytokines are molecules produced by immune cells that induce the migration of other cells to sites of infection or injury, promote the production of anti-microbial agents, and signal the production of inflammatory ...
Immunology May 13, 2013 | 5 / 5 (1) | 0 |
Big names in medicine are set to give an upbeat assessment of the war on AIDS on Tuesday, 30 years after French researchers identified the virus that causes the disease.
6 hours ago | 5 / 5 (1) | 0
For combat veterans suffering from post-traumatic stress disorder, 'fear circuitry' in the brain never rests
Chronic trauma can inflict lasting damage to brain regions associated with fear and anxiety. Previous imaging studies of people with post-traumatic stress disorder, or PTSD, have shown that these brain regions can over-or ...
7 hours ago | not rated yet | 0 |
(Medical Xpress)—What if the quality of your work depends more on your focus on the piano keys or canvas or laptop than your musical or painting or computing skills? If target users can be convinced, they ...
19 hours ago | 3.7 / 5 (3) | 0 |
The neural machinery underlying our olfactory sense continues to be an enigma for neuroscience. A recent review in Neuron seeks to expand traditional ideas about how neurons in the olfactory bulb might encode information about ...
18 hours ago | not rated yet | 0 |
In 2008 researchers from the University of Southern Denmark showed that the drug thioridazine, which has previously been used to treat schizophrenia, is also a powerful weapon against antibiotic-resistant bacteria such as ...
16 hours ago | 3.7 / 5 (3) | 0 |