Para-Dichlorobenzene Exposure Is Associated with Thyroid Dysfunction in US Adolescents

Area of Science:

• Environmental Health
• Endocrinology
• Toxicology

Background:

• Para-dichlorobenzene (PDCB) is a common volatile organic compound found in household products.
• Adolescents may be exposed to PDCB through inhalation or ingestion.
• Thyroid dysfunction is a significant health concern in pediatric populations.

Purpose of the Study:

• To investigate the association between PDCB exposure and thyroid function in U.S. adolescents.
• To determine if urinary 2,5-dichlorophenol (2,5-DCP) concentrations correlate with thyroid hormone levels.
• To assess the prevalence of hypothyroidism in relation to PDCB exposure.

Main Methods:

• Analysis of a nationally representative subsample of 618 adolescents (aged 12-19 years) from NHANES 2007-2008 and 2011-2012.
• Measurement of urinary 2,5-DCP concentrations as a biomarker for PDCB exposure.
• Utilized multivariate logistic and general linear regression models to assess associations with serum thyroid function measures.

Main Results:

• A significant positive association was observed between urinary 2,5-DCP levels and serum thyroid-stimulating hormone (TSH).
• Urinary 2,5-DCP concentrations were also positively associated with serum thyroglobulin levels.
• Increased prevalence of hypothyroidism was found in adolescents with higher urinary 2,5-DCP concentrations.

Conclusions:

• Para-dichlorobenzene exposure, indicated by urinary 2,5-DCP, may be associated with thyroid dysfunction in adolescents.
• Findings suggest a potential environmental risk factor for thyroid disorders in this age group.
• Further research is warranted to confirm these associations and explore underlying biological mechanisms.