کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2582882 1561703 2016 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Hepatic miRNA profiles and thyroid hormone homeostasis in rats exposed to dietary potassium perfluorooctanesulfonate (PFOS)
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم محیط زیست بهداشت، سم شناسی و جهش زایی
پیش نمایش صفحه اول مقاله
Hepatic miRNA profiles and thyroid hormone homeostasis in rats exposed to dietary potassium perfluorooctanesulfonate (PFOS)
چکیده انگلیسی


• Adult male rats were exposed in feed to 50 mg PFOS/kg diet for 28 days.
• Global gene and miRNA expression was detected using microarray approaches.
• Global gene expression study supports the involvement of PPARa and CAR/PXR.
• Altered miRNAs and their target genes were mostly associated with EMT.
• TH homeostasis was affected by the CAR/PXR pathway and phase II/III enzymes.

Perfluorooctanesulfonate (PFOS) has been widely used in a variety of industrial and commercial applications as a surfactant and stain repellent. PFOS causes liver damage (including liver tumors) in experimental animals, primarily via interaction with PPARα and CAR/PXR. We investigated the involvement of microRNAs (miRNAs) in PFOS-induced hepatotoxicity, and mechanisms involved in abnormal thyroid hormone (TH) homeostasis, in the livers of adult male rats exposed in feed to 50 mg PFOS/kg diet for 28 days. PFOS-treated rats exhibited expected histopathological and clinical chemistry changes, and global gene expression changes consistent with the involvement of PPARα and CAR/PXR. Thirty-eight miRNAs were significantly altered. Three members of the miR-200 family were the most increased, while miR-122-5p and miR-21-5p were the most decreased, in PFOS-treated rats. Expression of the miR-23b-3p/27b-3p/24-3p cluster also decreased in PFOS-treated animals. Pathway analysis of miRNAs and associated gene expression changes suggests involvement of epithelial to mesenchymal transition (EMT), which is a primary process of tumor cell motility and cancer metastasis. Our analysis also revealed transcripts that may mediate PFOS-induced effects on TH homeostasis including: activation of the CAR/PXR pathway, phase II/III enzymes, and deiodinase. These changes are consistent with low serum TH due to enhanced metabolic clearance of TH. However, most TH hepatic target genes were not altered in a manner consistent with reduced TH signaling, suggesting that PFOS exposure did not induce functional hypothyroidism. Collectively, the study suggests an important role for miRNAs in PFOS-induced hepatotoxicity and provides insight into the effects of PFOS on TH homeostasis.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Environmental Toxicology and Pharmacology - Volume 41, January 2016, Pages 201–210
نویسندگان
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