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Defective Retinoic Acid Regulation of the Pit-1 Gene Enhancer: A Novel Mechanism of Combined Pituitary Hormone Deficiency

1999; Oxford University Press; Volume: 13; Issue: 3 Linguagem: Inglês

10.1210/mend.13.3.0251

1944-9917

Laurie E. Cohen, Kerstin Zanger, Thierry Brue, Fredric E. Wondisford, Sally Radovick,

Cancer, Hypoxia, and Metabolism

Pit-1 is a pituitary-specific transcription factor responsible for pituitary development and hormone expression in mammals. Pit-1 contains two protein domains, termed POU-specific and POU-homeo, which are both necessary for DNA binding and activation of the GH and PRL genes and regulation of the PRL,TSH-β subunit (TSH-β), and Pit-1 genes. Pit-1 is also necessary for retinoic acid induction of its own gene during development through a Pit-1-dependent enhancer. Combined pituitary hormone deficiency is caused by defective transactivation of target genes in the anterior pituitary. In the present report, we provide in vivo evidence that retinoic acid induction of the Pit-1 gene can be impaired by a Pit-1 gene mutation, suggesting a new molecular mechanism for combined pituitary hormone deficiency in man.