Expression of type II iodothyronine deiodinase gene in the brain of a tropical spinefoot, Siganus guttatus

Nina Wambiji, Yong Ju Park, Se Jae Kim, Sung Pyo Hur, Yuki Takeuchi, Akihiro Takemura*


研究成果: Article査読

9 被引用数 (Scopus)


Type II iodothyronine deiodinase (D2) converts 3,5,3',5'-tetraiodothyronine to 3,5,3'-triiodothyronine and is involved in regulating thyroid hormone-dependent processes in various tissues. D2 mRNA expression in the mediobasal hypothalamus is affected by photoperiod, which influences reproductive processes in temperate birds and mammals. We examined whether D2 mRNA is expressed in the hypothalamus (located in the forebrain within the diencephalon area) and whether its abundance is affected by day length, temperature, or food availability in the tropical spinefoot, Siganus guttatus, which is endemic to tropical monsoon areas. The reverse transcription-polymerase chain reaction (RT-PCR) revealed that D2 mRNA is expressed in various brain regions. The abundance of hypothalamic D2 mRNA was higher at 12.00. h than at 06.00. h or 24.00. h. Rearing fish under constant dark conditions resulted in a decrease in D2 mRNA abundance during the subjective night. A single injection of melatonin lowered D2 mRNA abundance within 3. h. Collectively, it appears that hypothalamic D2 mRNA abundance is regulated by the circadian system and/or melatonin. No differences in D2 mRNA abundance were observed, when fish were reared at 20, 25, and 30. °C. However, food deprivation stimulated D2 mRNA expression during the daytime. These results suggest that photoperiodic and nutritive conditions affect hypothalamic D2 mRNA expression in S. guttatus.

ジャーナルComparative Biochemistry and Physiology - A Molecular and Integrative Physiology
出版ステータスPublished - 2011 12

ASJC Scopus subject areas

  • 生化学
  • 分子生物学
  • 生理学


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