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J Biol Chem, Vol. 273, Issue 42, 27541-27547, October 16, 1998

Role of GHF-1 in the Regulation of the Rat Growth Hormone Gene Promoter by Thyroid Hormone and Retinoic Acid Receptors

From the Instituto de Investigaciones Biomédicas, Consejo Superior de Investigaciones Científicas, 29029 Madrid, Spain

In non-pituitary HeLa cells the unliganded thyroid hormone or retinoic acid receptors cause a strong activation of the rat growth hormone promoter that is repressed by their ligands. In contrast, after expression of the pituitary-specific transcription factor GHF-1, thyroid hormone and retinoic acid produce a stimulation similar to that found in pituitary cells. Therefore, GHF-1 changes a ligand-dependent inhibition into a ligand-dependent activation. The essential role of GHF-1 on the rat growth hormone promoter was also demonstrated with AF-2-defective T₃ receptor mutants that show a normal activation of this promoter in the presence of GHF-1. Furthermore, a truncated T₃ receptor, which lacks the N-terminus and the DNA binding domain, was able to stimulate this promoter in the presence of GHF-1 and exogenous RXR receptors, suggesting the importance of protein to protein interactions in this regulation. This study shows that the final transcriptional effect depends not only on the type of regulatory promoter response elements but also on the presence of other transcriptional activators, in the case of the growth hormone promoter, the tissue-specific transcription factor GHF-1, which plays a coactivator-like role in this promoter.

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