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Hormone response of rodent phenylalanine hydroxylase requires HNF1 and the glucocorticoid receptor.

Expression of the rodent phenylalanine hydroxylase (PAH) gene is dependent upon hormones. Induction by glucocorticoids and cAMP occurs slowly and maximal stimulation is obtained by a synergistic effect of the two compounds. Hormone responsiveness is conferred by the tissue-specific HSIII enhancer and involves (i) protein kinase A mediating the cAMP response, even though a consensus sequence for binding of the cAMP response element binding protein is not present; (ii) other serine/threonine kinases as deduced from inhibitor studies; (iii) glucocorticoid receptor protein bound to glucocorticoid response element half sites; and (iv) binding of the liver-enriched transcription factor hepatocyte nuclear factor 1 (HNF1) to sites in the enhancer. Glucocorticoid receptor and HNF1, bound to their cognate sites, cooperatively increase the glucocorticoid response of the PAH gene, this response being synergistically enhanced by cAMP after long-term treatment.