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Synthesis and Regulation of Thyroid Hormones

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Related Experiment Video

Updated: Jun 30, 2026

In vivo Characterization of Endocrine Disrupting Chemical Effects via Thyroid Hormone Action Indicator Mouse

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Thyroid function and exposure to styrene.

Ferruccio Santini¹, Alberto Mantovani, Alfonso Cristaudo

¹Department of Endocrinology and Kidney, University Hospital of Pisa, Pisa, Italy. fsantini@endoc.med.unipi.it

Thyroid : Official Journal of the American Thyroid Association

|September 26, 2008

Summary

Occupational styrene exposure did not increase thyroid disease but may alter thyroid hormone metabolism. Further research is needed to confirm styrene

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Area of Science:

Occupational health
Endocrinology
Environmental toxicology

Background:

Environmental pollutants, including pesticides and industrial compounds, are increasingly recognized for their potential to disrupt thyroid function.
Previous research indicates that various substances can induce goiter or thyroid dysfunction.

Purpose of the Study:

To investigate the impact of occupational styrene exposure on the thyroid axis in male workers.
To assess potential correlations between styrene exposure levels and thyroid function parameters.

Main Methods:

Compared 38 styrene-exposed (E) workers with 123 non-exposed (NE) controls.
Measured serum thyroid hormones (TSH, FT4, FT3), thyroid antibodies, and calcitonin; performed thyroid ultrasound.
Assessed urinary styrene metabolites (mandelic acid and phenylglyoxylic acid) in exposed workers.

Main Results:

No significant differences in thyroid volume, nodularity, or autoimmune markers between E and NE groups.
Positive correlation observed between duration of exposure and thyroid volume in E workers.
In E workers, urinary styrene metabolites correlated positively with FT4 and the FT4/FT3 ratio, but not with TSH levels.

Conclusions:

Chronic styrene exposure is not linked to increased thyroid nodularity or autoimmune thyroid diseases.
Styrene may interfere with peripheral thyroid hormone metabolism, specifically T4 to T3 conversion.
Further investigation in larger populations is required to validate these findings and elucidate the mechanism of action.