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Endocrinology Vol. 142, No. 7 2961-2967
Copyright © 2001 by The Endocrine Society

ARTICLES

Expression and Regulation of Type II Iodothyronine Deiodinase in Human Thyroid Gland1

Masami Murakami, Osamu Araki, Yasuhiro Hosoi, Yuji Kamiya, Tadashi Morimura, Takayuki Ogiwara, Haruo Mizuma and Masatomo Mori

First Department of Internal Medicine, Gunma University School of Medicine, Maebashi 371-8511, Japan

Address all correspondence and requests for reprints to: Masami Murakami, M.D., First Department of Internal Medicine, Gunma University School of Medicine, Maebashi 371-8511, Japan. E-mail: mmurakam{at}showa.gunma-u.ac.jp

We have studied the expression of type II iodothyronine deiodinase (DII) in human thyroid tumors and cultured human thyroid cells to elucidate the mechanisms involved in the regulation of DII expression in human thyroid gland. Three cases with hyperfunctioning thyroid adenoma, including a case that showed an activating mutation of Gs{alpha} with a constitutive activation of cAMP production in cultured cells, and six cases with papillary thyroid carcinoma were analyzed in the present study. Free T3 was increased, whereas free T4 was within the normal range in all patients with hyperfunctioning thyroid adenoma. Thyroid tumor tissue and surrounding nontumor tissue were obtained at the time of surgery, and DII expression was compared between tumor tissue and nontumor tissue in each case. Northern analysis demonstrated the presence of DII messenger RNA (mRNA) approximately 7.5 kb in size in all of the tumor and nontumor tissues. DII mRNA and DII activity in hyperfunctioning thyroid adenoma were significantly increased compared with those in nontumor tissue in each case. In contrast, DII mRNA and DII activity in papillary thyroid carcinoma were decreased compared with those in nontumor tissue in each case. DII mRNA and DII activity in cultured human thyroid cells were significantly stimulated by TSH in a dose-dependent manner. The promoter activity of the human DII gene including the complete cAMP response element, transfected to cultured human thyroid cells, was stimulated by (Bu)2cAMP.

In summary, these results suggest that DII expression in human thyroid gland is regulated at the transcriptional level through the TSH receptor-Gs{alpha}-cAMP regulatory cascade, which may be related to the increase in circulating T3 level in patients with Graves’ disease and hyperfunctioning thyroid adenoma.




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