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Pretranslational Regulation of Rhythmic Type II Iodothyronine Deiodinase Expression by ß-Adrenergic Mechanism in the Rat Pineal Gland¹

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}sb.gunma-u.ac.jp

It has been demonstrated that type II iodothyronine deiodinase is present in rat pineal gland, and the deiodinase activity markedly increases during the hours of darkness, primarily through ß-adrenergic mechanism. We have studied the relationship between pineal type II iodothyronine deiodinase messenger RNA (mRNA) and the deiodinase activity to elucidate the mechanisms involved in the nocturnal rise in pineal deiodinase activity. Northern analysis has demonstrated that type II iodothyronine deiodinase mRNA is expressed in rat pineal gland, and the mRNA markedly increases during the hours of darkness. The nocturnal increase in pineal type II iodothyronine deiodinase activity is preceded by the increase in its mRNA. Daytime isoproterenol administration resulted in a rapid increase in pineal type II iodothyronine deiodinase mRNA followed by the increase in deiodinase activity. Propranolol treatment, bilateral superior cervical ganglionectomy, or constant light exposure significantly suppressed the nocturnal rise in type II iodothyronine deiodinase mRNA as well as the deiodinase activity. Moreover, isoproterenol or (Bu)₂AMP stimulated type II iodothyronine deiodinase mRNA and the deiodinase activity in cultured rat pineal glands. These results suggest that the rhythmic change in pineal type II iodothyronine deiodinase activity is regulated at least in part at the pretranslational level by a ß-adrenergic mechanism transmitted through superior cervical ganglia.

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