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Effect of Prolonged Iodine Overdose on Type 2 Iodothyronine Deiodinase Ubiquitination-Related Enzymes in the Rat Pituitary

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Abstract

The purpose of this study is to determine the effect of prolonged iodine overdose on type 2 iodothyronine deiodinase (D2) ubiquitination-related enzymes. Male Wistar rats were fed different doses of iodine and were then euthanized at the 4, 8, 12, or 24 weeks (4w, 8w, 12w, or 24w) after iodine administration. Urinary iodine concentration (UIC), thyroid-stimulating hormone (TSH), total thyroxine (TT4), and total triiodothyronine (TT3) were determined. Real-time quantitative RT-PCR and Western blot were used to measure mRNA and protein expression levels of pituitary D2 as well as two D2-specific ubiquitin ligases [WD repeat and SOCS box-containing protein 1 (WSB-1), membrane-associated ring finger (C3HC4) 6 (MARCH6 or TEB4)] and two D2-specific deubiquitinating enzymes [ubiquitin-specific peptidase 20 (USP20) and ubiquitin-specific peptidase 33 (USP33)]. The mRNA and protein expression levels of USP19, a TEB4-specific deubiquitinating enzyme, were also measured. Prolonged high iodine intake significantly increased TSH expression. At 12w, TSH was 1.57-, 1.44-, and 2.11-fold of NI group in 6HI, 10HI, and 50HI groups, respectively. At 24w, TSH had increased to 2.11-fold in the 50HI group. The pituitary D2 protein level decreased at 12w and 24w; though the mRNA level did not change. Prolonged iodine intake increased mRNA and protein expression levels of pituitary WSB-1 and TEB4. High iodine intake had no discernible effects on USP20. Temporary increases in USP33 and USP19 mRNA levels were observed. The enzymes related to D2 ubiquitination change with prolonged high iodine intake. Increased D2 ubiquitination suppresses the activity of D2, causing a decrease in negative feedback of the hypothalamic-pituitary-thyroid axis.

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Authors and Affiliations

  1. The Endocrine Institute and the Liaoning Provincial Key Laboratory of Endocrine Diseases, Department of Endocrinology and Metabolism, The First Hospital of China Medical University, No.155, North Nanjing Street, Heping District, Shenyang, China

    Xiaowen Zhang, Yaqiu Jiang, Wenqing Han, Aihua Liu, Xiaochen Xie, Cheng Han, Chenling Fan, Hong Wang, Hongmei Zhang, Shuangning Ding, Zhongyan Shan & Weiping Teng

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  1. Xiaowen Zhang
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Correspondence to Weiping Teng.

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Funding

This work was supported by grants from the National Natural Science Foundation of China (No. 81370893), Research Foundation, Department of Science and Technology, Liaoning Province Government, China (Grant no. 2011225023), the Research Foundation of Innovative Team in Advanced Educational Institute of Liaoning Province (Grant LT 2012015), Important Platform of Science and Technology for Universities in Liaoning Province (16010), and Guanghua Science and Technology Foundation of China (Grant 2007–02).

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The authors declare that they have no conflict of interest.

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All applicable international, national, and/or institutional guidelines for the care and use of animals were followed. All procedures performed in studies involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted.

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Xiaowen Zhang and Yaqiu Jiang contributed equally to this work.

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Zhang, X., Jiang, Y., Han, W. et al. Effect of Prolonged Iodine Overdose on Type 2 Iodothyronine Deiodinase Ubiquitination-Related Enzymes in the Rat Pituitary. Biol Trace Elem Res 174, 377–386 (2016). https://doi.org/10.1007/s12011-016-0723-2

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