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MTOR downregulates iodide uptake in thyrocytes.

Authors: De Souza, EC  Padron, AS  Braga, WM  De Andrade, BM  Vaisman, M  Nasciutti, LE  Ferreira, AC  De Carvalho, DP 
Citation: de Souza EC, etal., J Endocrinol. 2010 Jul;206(1):113-20. doi: 10.1677/JOE-09-0436. Epub 2010 Apr 14.
Pubmed: (View Article at PubMed) PMID:20392814
DOI: Full-text: DOI:10.1677/JOE-09-0436

Phosphoinositide-3-kinase (PI3K) inhibition increases functional sodium iodide symporter (NIS) expression in both FRTL-5 rat thyroid cell line and papillary thyroid cancer lineages. In several cell types, the stimulation of PI3K results in downstream activation of the mechanistic target of rapamycin (MTOR), a serine-threonine protein kinase that is a critical regulator of cellular metabolism, growth, and proliferation. MTOR activation is involved in the regulation of thyrocyte proliferation by TSH. Here, we show that MTOR inhibition by rapamycin increases iodide uptake in TSH-stimulated PCCL3 thyroid cell line, although the effect of rapamycin was less pronounced than PI3K inhibition. Thus, NIS inhibitory pathways stimulated by PI3K might also involve the activation of proteins other than MTOR. Insulin downregulates iodide uptake and NIS protein expression even in the presence of TSH, and both effects are counterbalanced by MTOR inhibition. NIS protein expression levels were correlated with iodide uptake ability, except in cells treated with TSH in the absence of insulin, in which rapamycin significantly increased iodide uptake, while NIS protein levels remained unchanged. Rapamycin avoids the activation of both p70 S6 and AKT kinases by TSH, suggesting the involvement of MTORC1 and MTORC2 in TSH effect. A synthetic analog of rapamycin (everolimus), which is clinically used as an anticancer agent, was able to increase rat thyroid iodide uptake in vivo. In conclusion, we show that MTOR kinase participates in the control of thyroid iodide uptake, demonstrating that MTOR not only regulates cell survival, but also normal thyroid cell function both in vitro and in vivo.

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RGD Object Information
RGD ID: 10043186
Created: 2015-05-19
Species: All species
Last Modified: 2015-05-19
Status: ACTIVE



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RGD is funded by grant HL64541 from the National Heart, Lung, and Blood Institute on behalf of the NIH.