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Environmental chemicals and thyroid function.

Malene Boas1, Ulla Feldt-Rasmussen, Niels E Skakkebaek

  • 1University Department of Growth and Reproduction GR-5064, Copenhagen Denmark. marlene.boas@rh.hosp.dk

European Journal of Endocrinology
|April 29, 2006
PubMed
Summary
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Environmental chemicals may disrupt thyroid homeostasis, impacting human health. Further research is needed to confirm if animal findings on thyroid disruption extend to humans.

Area of Science:

  • Endocrinology
  • Environmental Health
  • Toxicology

Background:

  • Growing evidence suggests environmental chemicals disrupt endocrine systems, with most focus on reproductive organs.
  • Emerging concerns indicate potential disruption of thyroid homeostasis by various chemical classes.
  • Thyroid disruption by chemicals poses risks, particularly to fetal neurological development.

Purpose of the Study:

  • To review the evidence for environmental chemical disruption of thyroid homeostasis.
  • To explore the mechanisms by which chemicals interfere with the thyroid axis.
  • To highlight the potential human health implications, especially for vulnerable populations.

Main Methods:

  • Literature review of studies on chemical effects on thyroid function in animals and humans.

Related Experiment Videos

  • Analysis of data on specific chemical groups like PCBs, dioxins, furans, flame retardants, and phthalates.
  • Examination of the mechanisms of thyroid disruption at various levels of the hypothalamic-pituitary-thyroid axis.

    • Main Results:

    • Polychlorinated biphenyls, dioxins, and furans are strongly linked to hypothyroidism in animals, with evidence of human thyroid impact.
    • Flame retardants reduce thyroid hormone levels in rodents, but human data is limited.
    • Phthalates show varied effects, with some stimulating thyroid hormone production, unlike other disruptors.

    Conclusions:

    • Chemicals can disrupt thyroid homeostasis through diverse mechanisms affecting the hypothalamic-pituitary-thyroid axis and hormone metabolism.
    • Even minor alterations in thyroid balance can have adverse health effects.
    • Urgent investigation is required to ascertain the relevance of animal-based thyroid disruption findings to human health.