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Relationship between triclosan exposure and thyroid hormones: the Second Korean National Environmental Health Survey (2012?2014)

 ( Ha Na-Young ) - Inje University Haeundae Paik Hospital Department of Occupational and Environmental Medicine

 ( Kim Dae-Hwan ) - Inje University Haeundae Paik Hospital Department of Occupational and Environmental Medicine
 ( Ryu Ji-Young ) - Inje University Haeundae Paik Hospital Department of Occupational and Environmental Medicine

Abstract


Background: 5-chloro-2-(2,4-dichlorophenoxy)phenol (triclosan) is used as an antiseptic and is a potential endocrine-disrupting chemical that can affect thyroid hormone levels. This study evaluated the relationship between triclosan exposure and thyroid hormones.

Methods: Data from the second Korean National Environmental Health Survey (2012?2014) were analyzed. Triclosan exposure was evaluated using urinary triclosan concentrations and classified into 2 groups: ‘below detection (< limit of detection [LOD])’ vs. ‘detected (≥ LOD).’ Multiple linear regression analysis was conducted to determine the relationship between triclosan exposure and the serum thyroid hormone concentrations, adjusting for age, body mass index, urinary creatinine, and smoking status.

Results: When grouped by sex, triclosan exposure was positively associated with the serum thyroid-stimulating hormone (TSH) concentrations in females with marginal significance (β = 0.066, p = 0.058). However, no significant association was identified between triclosan exposure and serum total triiodothyronine and thyroxine in both males and females, and TSH in males.

Conclusions: This study is the first human study to evaluate the relationship between triclosan exposure and serum thyroid hormone concentrations in the Korean population. There was suggestive positive association between triclosan exposure and the serum TSH in females. Further studies need to evaluate the relationship between long-term exposure to low-dose triclosan and thyroid hormones.

키워드

Endocrine-disrupting chemical; Triclosan; Thyroid hormone
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