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Effects of environmental synthetic chemicals on thyroid function
1Wildlife and Contaminants Program, World Wildlife Fund, Washington, DC 20037, USA.
Thyroid : Official Journal of the American Thyroid Association
|October 20, 1998
Summary
Synthetic chemicals can disrupt thyroid function in wildlife and animals. Human studies show mild thyroid changes with high exposure, but in utero exposure
Area of Science:
- Environmental Science
- Toxicology
- Endocrinology
Background:
- Synthetic chemicals, including pesticides and industrial compounds, are environmental contaminants.
- Natural chemicals are known to cause thyroid imbalance, but synthetic chemical effects are less understood.
- Few human studies exist, leading to controversy regarding clinical impact.
Purpose of the Study:
- To review existing literature on synthetic chemical-induced thyroid disruption.
- To focus on pesticides (DDT, amitrole, thiocarbamates) and industrial chemicals (polyhalogenated hydrocarbons, phenols, phthalates).
- To assess impacts across wildlife, experimental animals, and humans.
Main Methods:
- Literature review of studies on wildlife, experimental animals (rodents, fish, primates), and humans.
- Analysis of observed thyroid effects in polluted wildlife areas.
- Examination of experimental data on chemical mechanisms and human exposure levels.
Main Results:
- Wildlife in polluted areas show significant goiter and thyroid imbalance.
- Experimental animals confirm thyroid disruption potential and mechanisms.
- Adult humans show mild thyroid changes only at high occupational/accidental exposure levels; background levels appear less impactful.
Conclusions:
- Synthetic chemicals pose a risk to wildlife thyroid function.
- Human thyroid function is less affected by background exposure but vulnerable to high exposure.
- Transgenerational effects of in utero exposure on neurodevelopment require further investigation, with potential links to thyroid disruption or direct neurotoxicity.