The potential association of polybrominated diphenyl ether concentrations in serum to thyroid function in patients with abnormal thyroids: a pilot study.

BACKGROUND: To explore possible associations between polybrominated diphenyl ether (PBDE) exposure and patients with abnormal thyroid hormone levels whose thyroid function parameters are above normal ranges. METHODS: The serum of 40 patients with thyroid hormone abnormalities was collected in Kunming. triiodothyronine (T3), thyroxine (T4), free triiodothyronine (FT3), free thyroxine (FT4), and thyroid-stimulating hormone (TSH) were detected in serum using chemiluminescence. The PBDE homologs in the patients' serum were quantitatively analyzed by gas chromatography-mass spectrometry. If the detection frequency of the compound exceeded 50%, it was included in the analysis. Spearman's rank correlation coefficient and multiple linear regression were used to evaluate the correlation between PBDE homologs and five thyroid function parameters. RESULTS: A total of 33 PBDE homologs were detected, 7 of which had a more than 50% detection rate. BDE-47 was the main homolog detected. Spearman's correlation showed that no relationship was found between PBDE homologs and thyroid hormones. Multiple linear regression showed that BDE-153 was positively correlated with T4, negatively correlated with T3, while BDE-47 was negatively correlated with FT4 (P 0.05). The s coefficient showed that the increase in the logarithmic unit of ∑7PBDEs was related to an increase in FT4 and T4 levels and decreased TSH, T3, and FT3 levels. CONCLUSIONS: There is a significant correlation between exposure to PBDE and thyroid dysfunction. The increase of total PBDEs was significantly correlated with the increase of FT4 and T4 levels and decreased TSH, T3, and FT3 levels.