Environmental chemicals impacting the thyroid: targets and consequences.

Area of Science:

• Neuroendocrinology
• Developmental Biology
• Environmental Toxicology

Background:

• Thyroid hormone (TH) is critical for normal brain development.
• TH actions are mediated by thyroid hormone receptor (TR) isoforms and cofactors.
• TH signaling pathways are essential during specific developmental windows.

Purpose of the Study:

• To investigate how environmental chemicals interfere with thyroid hormone (TH) signaling during brain development.
• To understand the mechanisms and doses at which chemicals impact TH function.
• To assess potential risks to children's health from chemical exposures affecting TH signaling.

Main Methods:

• Review of recent research on environmental chemical interactions with TH signaling.
• Analysis of studies showing chemical binding to TRs and effects on TR function.
• Examination of specific chemical classes like PCBs, PBDEs, BPA, and phthalates.

Main Results:

• Environmental chemicals can interfere with thyroid function and TH signaling pathways.
• Certain industrial chemicals (PCBs, PBDEs, BPA, phthalates) bind to TRs, potentially altering their function.
• The dose and mechanism of chemical action, as well as compensatory responses, are key considerations.

Conclusions:

• Environmental chemicals pose a potential risk to neurodevelopment by disrupting TH signaling.
• TRs are identified as unintended targets for common industrial chemicals.
• Further research is needed to understand the impact of chemical mixtures on TH signaling and children's health.