4.5 Article

T3 differentially regulates TRH expression in developing hypothalamic neurons in vitro

Journal

BRAIN RESEARCH
Volume 1305, Issue -, Pages 20-30

Publisher

ELSEVIER SCIENCE BV
DOI: 10.1016/j.brainres.2009.09.042

Keywords

Development; Neuronal differentiation; TRH; Hypothalamus; Gene expression

Categories

Funding

  1. CONACYT [61208]
  2. DGAPA-UNAM [IN227506-3, IN224909]

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Triiodothyronine (T3) plays an important role during development of the central nervous system. T3 effects on gene expression are determined in part by the type of thyroid hormone receptors (TRs) expressed in a given cell type. Previous studies have demonstrated that thyrotropin releasing hormone (TRH) transcription in the adult hypothalamus is subjected to negative regulation by thyroid hormones. However, the role of T3 on the development of TRH expression is unknown. in this study we used primary cultures derived from 17-day-old fetal rat hypothalamus to analyze the effects of T3 on TRH gene expression during development. T3 increased TRH mRNA expression in immature cultures, but decreased it in mature cultures. In addition, T3 up-regulated TR alpha 1 and TR beta 2 mRNA expression. TR alpha 1 expression coincided chronologically with that of TRH in the rat hypothalamus in vivo. Maturation of TRH expression in the hypothalamus may involve T3 acting through TR alpha 1. (C) 2009 Elsevier B.V. All rights reserved.

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