Adenovirus-mediated transfer of thyroid transcription factor-1 induces radioiodide organification and retention in thyroid cancer cells.
Loss of thyroid-specific gene expression and functions accompanied by loss of thyroid transcription factors render them unresponsive to radioiodide therapy in poorly differentiated and anaplastic thyroid cancer. In anticipation of reactivation of thyroid functions, we investigated the effect of thyroid transcription factor-1 (TTF-1) gene transfer on thyroid cancer cells. Reexpression of thyroperoxidase (TPO) and thyroglobulin (Tg) mRNA and protein was detected in poorly differentiated human thyroid cancer cells that were infected with an adenovirus vector containing TTF-1 (AdTTF-1). Although TTF-1 gene transfer faintly induced iodide uptake, the induction of sodium/iodide symporter (NIS) mRNA was not observed in AdTTF-1-infected cells. To analyze the effect of TTF-1 on iodide metabolism, we transfected an NIS expression vector into BHP18-21v cells and cloned a cell line (N-BHP18-21v) that stably expressed NIS. The treatment of N-BHP18-21v cells with AdTTF-1 significantly increased the amount of protein-bound radioiodide and prolonged the iodide efflux. AdTTF-1 injections significantly induced iodide retention and organification in tumors formed from N-BHP18-21v cells in nude mice. These results indicate that AdTTF-1 specifically induces iodide organification and retards iodide efflux in thyroid cancer cells in vitro and in vivo.
Third Department of Internal Medicine, Faculty of Medicine, University of Yamanashi, 1110 Shimokato, Tamaho, Yamanashi 409-3898, Japan.
Fumihiko
F
Furuya
Hiroki
H
Shimura
Asako
A
Miyazaki
Katsumi
K
Taki
Kazuyasu
K
Ohta
Kazutaka
K
Haraguchi
Toshimasa
T
Onaya
Toyoshi
T
Endo
Tetsuro
T
Kobayashi
D000256:Adenoviridae / Q000235:genetics; D001324:Autoantigens / Q000235:genetics; D002291:Carcinoma, Papillary; D018014:Gene Transfer Techniques; D006801:Humans; D007453:Iodide Peroxidase / Q000235:genetics; D007454:Iodides / Q000493:pharmacokinetics; D007457:Iodine Radioisotopes / Q000493:pharmacokinetics; D033862:Iron-Binding Proteins / Q000235:genetics; D009687:Nuclear Proteins / Q000235:genetics* / Q000378:metabolism*; D013954:Thyroglobulin / Q000235:genetics; D013964:Thyroid Neoplasms; D000074482:Thyroid Nuclear Factor 1; D014157:Transcription Factors / Q000235:genetics* / Q000378:metabolism*; D014407:Tumor Cells, Cultured
D001324:Autoantigens; D007454:Iodides; D007457:Iodine Radioisotopes; D033862:Iron-Binding Proteins; C000614412:NKX2-1 protein, human; C000614414:Nkx2-1 protein, mouse; D009687:Nuclear Proteins; D000074482:Thyroid Nuclear Factor 1; D014157:Transcription Factors; D013954:Thyroglobulin; C056658:TPO protein, human; D007453:Iodide Peroxidase