Document Detail

Decreased radioiodine uptake of FRTL-5 cells after (131)I incubation in vitro: molecular biological investigations indicate a cell cycle-dependent pathway.
MedLine Citation:
PMID:  18228019     Owner:  NLM     Status:  MEDLINE    
PURPOSE: In radioiodine therapy the "stunning phenomenon" is defined as a reduction of radioiodine uptake after diagnostic application of (131)I. In the current study, we established an in vitro model based on the "Fisher rat thyrocyte cell line no. 5" (FRTL-5) to investigate the stunning. METHODS: TSH-stimulated FRTL-5 cells were incubated with (131)I. Time-dependent (131)I uptake and the viability of FRTL-5 cells were evaluated at 4-144 h after radioiodine application. All data was corrected for number of viable cells, half life and (131)I concentration. Sodium iodide symporter (NIS) and the housekeeping gene (beta-actin, GAPDH) levels were quantified by quantitative polymerase chain reaction (qPCR). Additionally, immunohistochemical staining (IHC) of NIS on the cell membrane was carried out. RESULTS: FRTL-5 monolayer cell cultures showed a specific maximum uptake of (131)I 24-48 h after application. Significantly decreased (131)I uptake values were observed after 72-144 h. The decrease in radioiodine uptake was correlated with decreasing mRNA levels of NIS and housekeeping genes. In parallel, unlike in controls, IHC staining of NIS on FRTL-5 cells declined significantly after (131)I long-term incubation. CONCLUSIONS: It could be demonstrated that during (131)I incubation of FRTL-5 cells, radioiodine uptake decreased significantly. Simultaneously decreasing levels of NIS mRNA and protein expression suggest a NIS-associated mechanism. Since mRNA levels of housekeeping genes decreased, too, the reduced NIS expression might be provoked by a cell cycle arrest. Our investigations recommend the FRTL-5 model as a valuable tool for further molecular biological investigations of the stunning phenomenon.
Birgit Meller; Erzsébet Gaspar; Wibke Deisting; Barbara Czarnocka; Manfred Baehre; Björn E Wenzel
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2008-01-29
Journal Detail:
Title:  European journal of nuclear medicine and molecular imaging     Volume:  35     ISSN:  1619-7070     ISO Abbreviation:  Eur. J. Nucl. Med. Mol. Imaging     Publication Date:  2008 Jun 
Date Detail:
Created Date:  2008-05-14     Completed Date:  2008-10-14     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101140988     Medline TA:  Eur J Nucl Med Mol Imaging     Country:  Germany    
Other Details:
Languages:  eng     Pagination:  1204-12     Citation Subset:  IM    
Clinic of Radiology and Nuclear Medicine, University of Lübeck, Ratzeburger Allee 160, 23538, Lübeck, Germany.
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MeSH Terms
Cell Cycle / radiation effects*
Cell Line
Iodine Radioisotopes / administration & dosage*,  pharmacokinetics*
Rats, Inbred F344
Signal Transduction / radiation effects*
Thyroid Gland / metabolism*,  radiation effects*
Reg. No./Substance:
0/Iodine Radioisotopes

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