Abstract:
OBJECTIVE:The acute decrease in iodide organification in the thyroid in response to excess iodide is termed the acute Wolff-Chaikoff effect and normal organification resumes in spite of continued high plasma iodide concentrations (escape from the acute Wolff-Chaikoff effect). We have recently reported that large doses of iodide given to rats chronically decrease the sodium/iodide symporter (NIS) mRNA and protein, suggesting that escape is due to a decrease in NIS and subsequent iodide transport. We have now studied the effect of excess iodide on NIS in FRTL-5 cells to further explore the mechanisms whereby excess iodide decreases NIS. DESIGN:FRTL-5 cells were employed and were incubated in the presence or absence of various concentrations of iodide. NIS mRNA and protein and the turnover of NIS were assessed. METHODS:NIS mRNA was measured by Northern analysis, NIS protein by Western analysis and NIS turnover by pulse-chase labeling experiments. RESULTS:Iodide (10(-) mol/l) had no effect on NIS mRNA in FRTL-5 cells at 24 and 48 h compared with cells cultured in the absence of iodide. However, excess iodide decreased NIS protein by 50% of control values at 24 h and by 70% at 48 h. This effect of iodide was dose dependent. Pulse-chase experiments demonstrated that there was no effect of iodide on new NIS protein synthesis and that the turnover of NIS protein in the presence of iodide was 27% faster than in the absence of added iodide. CONCLUSIONS:Excess iodide does not decrease NIS mRNA in FRTL-5 cells but does decrease NIS protein, suggesting that in this in vitro thyroid cell model iodide modulates NIS, at least in part, at a post-transcriptional level. This iodide-induced decrease in NIS protein appears to be due, at least partially, to an increase in NIS protein turnover.
journal_name
Eur J Endocrinoljournal_title
European journal of endocrinologyauthors
Eng PH,Cardona GR,Previti MC,Chin WW,Braverman LEdoi
10.1530/eje.0.1440139subject
Has Abstractpub_date
2001-02-01 00:00:00pages
139-44issue
2eissn
0804-4643issn
1479-683Xpii
1440139journal_volume
144pub_type
杂志文章abstract:CONTEXT AND OBJECTIVE:High-mobility group box-1 (HMGB1) is a pro-inflammatory cytokine that may contribute to the pathogenesis of micro- and macrovascular complications commonly observed in diabetes. We investigated whether HMGB1 is associated with: i) markers of low-grade inflammation (LGI) and endothelial dysfunction...
journal_title:European journal of endocrinology
pub_type: 杂志文章
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更新日期:2012-02-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/EJE-08-0639
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abstract::Bone mineral density (BMD), bone mineral content and body composition were determined in 47 middle-aged (mean age 47.9 +/- 1.1 years) women with Turner's syndrome. Bone mineral density was measured in the forearm, femoral neck and total body. The women investigated had a BMD lower than the normal mean. When expressed ...
journal_title:European journal of endocrinology
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journal_title:European journal of endocrinology
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pub_type: 临床试验,杂志文章
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更新日期:2003-01-01 00:00:00
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更新日期:2011-08-01 00:00:00
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pub_type: 杂志文章,评审
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更新日期:2017-05-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/eje.0.1380227
更新日期:1998-02-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章,评审
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更新日期:2013-07-13 00:00:00
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更新日期:1995-11-01 00:00:00
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doi:10.1530/eje.0.1430119
更新日期:2000-07-01 00:00:00
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更新日期:2007-06-01 00:00:00
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pub_type: 杂志文章,随机对照试验
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更新日期:2008-12-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/eje.0.1480301
更新日期:2003-03-01 00:00:00
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journal_title:European journal of endocrinology
pub_type: 杂志文章
doi:10.1530/EJE-12-1045
更新日期:2013-03-15 00:00:00
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pub_type: 杂志文章
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更新日期:2011-05-01 00:00:00
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pub_type: 杂志文章,meta分析
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更新日期:2014-10-01 00:00:00
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更新日期:2019-12-01 00:00:00
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更新日期:2010-07-01 00:00:00
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更新日期:1998-01-01 00:00:00