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자료유형
학술저널
저자정보
김민주 (서울대학교병원) 김환희 (Department of Internal Medicine Seoul National University College of Medicine Seoul) 송영신 (차의과학대학교) 김옥희 (Department of Physiology Gachon University College of Medicine Korea) 최경호 (서울대학교 보건대학원) 김수진 (서울대학교 보건대학원) 오병철 (Department of Physiology Gachon University College of Medicine Korea) 박영주 (서울대학교)
저널정보
대한내분비학회 Endocrinology and Metabolism Endocrinology and Metabolism Vol.36 No.2
발행연도
2021.1
수록면
447 - 454 (8page)

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Background: Di-2-ethylhexyl phthalate (DEHP) is known to disrupt thyroid hormonal status. However, the underlying molecularmechanism of this disruption is unclear. Therefore, we investigated the direct effects of DEHP on the thyroid gland. Methods: DEHP (vehicle, 50 mg/kg, and 500 mg/kg) was administered to Sprague-Dawley rats for 2 weeks. The expression of thethyroid hormone synthesis pathway in rat thyroid tissues was analyzed through RNA sequencing analysis, quantitative reverse transcription-polymerase chain reaction (RT-PCR), and immunohistochemical (IHC) staining. DEHP was treated to FRTL-5 rat thyroidcells, and an RT-PCR analysis was performed. A reporter gene assay containing the promoter of thyroid stimulating hormone receptor (TSHR) in Nthy-ori 3-1 human thyroid cells was constructed, and luciferase activity was determined. Results: After DEHP treatment, the free thyroxine (T4) and total T4 levels in rats significantly decreased. RNA sequencing analysisof rat thyroid tissues showed little difference between vehicle and DEHP groups. In the RT-PCR analysis, Tshr expression was significantly lower in both DEHP groups (50 and 500 mg/kg) compared to that in the vehicle group, and IHC staining showed thatTSHR expression in the 50 mg/kg DEHP group significantly decreased. DEHP treatment to FRTL-5 cells significantly down-regulated Tshr expression. DEHP treatment also reduced luciferase activity in a reporter gene assay for TSHR. Conclusion: Although overall genetic changes in the thyroid hormone synthesis pathway are not clear, DEHP exposure could significantly down-regulate Tshr expression in thyroid glands. Down-regulation of Tshr gene appears to be one of potential mechanisms ofthyroid disruption by DEHP exposure.

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