The Krüppel-like factor 4 controls biosynthesis of thyrotropin-releasing hormone during hypothalamus development.
Mol Cell Endocrinol
; 333(2): 127-33, 2011 Feb 20.
Article
em En
| MEDLINE
| ID: mdl-21182892
ABSTRACT
Embryonic neurogenesis is controlled by the activation of specific genetic programs. In the hypothalamus, neuronal thyrotropin-releasing hormone (TRH) populations control important physiological process, including energy homeostasis and autonomic function; however, the genetic program leading to the TRH expression is poorly understood. Here, we show that the Klf4 gene, encoding the transcription factor Krüppel-like factor 4 (Klf4), was expressed in the rat hypothalamus during development and regulated Trh expression. In rat fetal hypothalamic cells Klf4 regulated Trh promoter activity through CACCC and GC motifs present on the Trh gene promoter. Accordingly, hypothalamic Trh expression was down-regulated at embryonic day 15 in the Klf4(-/-) mice resulting in diminished bioactive peptide levels. Although at the neonatal stage the Trh transcript levels of the Klf4(-/-) mice were normal, the reduction in peptide levels persisted. Thus, our data indicate that Klf4 plays a key role in the maturation of TRH expression in hypothalamic neurons.
Texto completo:
1
Base de dados:
MEDLINE
Assunto principal:
Hormônio Liberador de Tireotropina
/
Fatores de Transcrição Kruppel-Like
/
Hipotálamo
Limite:
Animals
Idioma:
En
Revista:
Mol Cell Endocrinol
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
México