دورية أكاديمية
Moderate doses of iodide in vivo inhibit cell proliferation and the expression of thyroperoxidase and Na+/I- symporter mRNAs in dog thyroid.
العنوان: | Moderate doses of iodide in vivo inhibit cell proliferation and the expression of thyroperoxidase and Na+/I- symporter mRNAs in dog thyroid. |
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المؤلفون: | Uyttersprot N; Institut de Recherche Interdisciplinaire, IRIBHN, Université Libre de Bruxelles, Campus Erasme, Belgium., Pelgrims N, Carrasco N, Gervy C, Maenhaut C, Dumont JE, Miot F |
المصدر: | Molecular and cellular endocrinology [Mol Cell Endocrinol] 1997 Aug 08; Vol. 131 (2), pp. 195-203. |
نوع المنشور: | Journal Article; Research Support, Non-U.S. Gov't |
اللغة: | English |
بيانات الدورية: | Publisher: North Holland Publishing Country of Publication: Ireland NLM ID: 7500844 Publication Model: Print Cited Medium: Print ISSN: 0303-7207 (Print) Linking ISSN: 03037207 NLM ISO Abbreviation: Mol Cell Endocrinol Subsets: MEDLINE |
أسماء مطبوعة: | Publication: Limerick : North Holland Publishing Original Publication: Amsterdam, North-Holland. |
مواضيع طبية MeSH: | Symporters*, Carrier Proteins/*genetics , Cell Division/*drug effects , Iodide Peroxidase/*genetics , Membrane Proteins/*genetics , Potassium Iodide/*pharmacology , RNA, Messenger/*metabolism , Thyroid Gland/*drug effects, Animals ; Blotting, Northern ; Dogs ; Gene Expression/drug effects ; Hypothyroidism/metabolism ; Perchlorates/pharmacology ; Propylthiouracil/pharmacology ; Receptors, Thyrotropin/genetics ; Sodium Compounds/pharmacology ; Thyroglobulin/genetics ; Thyroid Gland/cytology ; Thyroid Gland/metabolism ; Thyrotropin/blood ; Thyroxine/blood ; Triiodothyronine/blood |
مستخلص: | The function and the growth of adult thyroid gland is controlled by the opposite actions of thyrotropin (TSH) and iodide, the main substrate of the gland. Iodide deprivation leads to stimulation of the thyroid, improving the efficiency of iodide transport for hormone biosynthesis. We have investigated cell proliferation and thyroid specific gene expression 24 and 48 h after administering KI to dogs previously treated with goitrogens and perchlorate. In the hypothyroid dogs T3 and T4 serum levels decreased from 53 +/- 4 to < 30 ng/dl and from 1.6 +/- 0.6 to < 1 microg/dl respectively; TSH concentration increased from 0.16 +/- 0.02 to 2.7 +/- 0.4 ng/ml. After a 24 h moderate KI treatment (300 microg KI/dog of +/- 10 kg) serum T3 concentrations rose higher than the initial normal values, while T4 concentrations increased to reach values equivalent to the normal level. The high TSH concentration did not change significantly. The hyperplasia of the chronically stimulated thyroid resulting from goitrogens/NaClO4 treatment was not modified by this short term treatment with KI. In contrast, KI decreased the weight of the total gland and the level of cell proliferation, as determined by the fraction of cells incorporating BrdU. The effect of acute administration of KI on the expression of four major thyroid genes, the TSH receptor (TSHr), thyroglobulin (Tg), thyroperoxidase (TPO), and Na+/I- symporter (NIS) was analyzed by Northern blot. Tg, TPO and NIS mRNA expressions were up-regulated by chronic stimulation. The expression of the mRNAs of TSHr and Tg did not significantly differ between hyperstimulated and KI-treated dogs while TPO and NIS mRNA expression decreased after a 48 h KI treatment. TPO and NIS are therefore the only of these four genes whose expression is acutely modulated by iodide in vivo. Under TSH stimulation low doses of iodide resulted in: (1) decreased cell proliferation, (2) reestablished synthesis and secretion of thyroid hormones, (3) diminished TPO and NIS mRNA expression. Notably low doses of iodide under the same conditions had no effect on Tg and TSHr mRNA expression. |
المشرفين على المادة: | 0 (Carrier Proteins) 0 (Membrane Proteins) 0 (Perchlorates) 0 (RNA, Messenger) 0 (Receptors, Thyrotropin) 0 (Sodium Compounds) 0 (Symporters) 06LU7C9H1V (Triiodothyronine) 1C4QK22F9J (Potassium Iodide) 4XE5NDT4K1 (sodium-iodide symporter) 721M9407IY (Propylthiouracil) 9002-71-5 (Thyrotropin) 9010-34-8 (Thyroglobulin) 97F4MTY3VA (sodium perchlorate) EC 1.11.1.8 (Iodide Peroxidase) Q51BO43MG4 (Thyroxine) |
تواريخ الأحداث: | Date Created: 19970808 Date Completed: 19971002 Latest Revision: 20190813 |
رمز التحديث: | 20240627 |
DOI: | 10.1016/s0303-7207(97)00108-1 |
PMID: | 9296378 |
قاعدة البيانات: | MEDLINE |
تدمد: | 0303-7207 |
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DOI: | 10.1016/s0303-7207(97)00108-1 |