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- W1968085816 abstract "Transcription of the phosphoenolpyruvate carboxykinase gene is stimulated by glucocorticoids, retinoic acid, and cAMP and is dominantly inhibited by insulin and phorbol esters. The glucocorticoid response is mediated by a complex regulatory unit that consists of two glucocorticoid receptor (GR) binding sites (GR1 and GR2) and two adjacent accessory factor elements (AF1 and AF2). Deletion of either the AF1 or the AF2 element results in a 50-75% reduction of the glucocorticoid response. In addition to their accessory role in glucocorticoid action, the AF1 and AF2 elements mediate retinoic acid and insulin/phorbol ester effects, respectively. Site-directed mutagenesis was performed on AF1 and AF2 to precisely locate the sequences responsible for accessory activity in each element. The glucocorticoid accessory activity of the AF1 element maps to the same 12-base pair sequence (TGACCTTTGGCC) involved in the response of the PEPCK gene to retinoic acid. The glucocorticoid accessory activity of the AF2 region maps to the same 10-base pair sequence (TGGTGTTTTG) responsible for mediating the insulin and phorbol ester responses through this element. The AF1 and AF2 elements bind different sets of nuclear proteins, and this binding is not qualitatively or quantitatively affected by treatment of the rat H4IIE hepatoma cells with retinoic acid (AF1) or insulin (AF2). AF2 functions in a heterologous context (a consensus glucocorticoid response element and the thymidine kinase promoter), whereas AF1 functions in this context only if the retinoic acid receptor is overexpressed in the cells. These results show that the AF1 and AF2 elements affect the glucocorticoid response through different protein DNA interactions, and that a small sequence in each serves multiple functions. Together with GR1 and GR2, they form a complex hormone response unit which provides an integrated response of the phosphoenolpyruvate carboxykinase gene to a variety of positive and negative signals." @default.
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- W1968085816 date "1994-05-01" @default.
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- W1968085816 title "Integration of multiple signals through a complex hormone response unit in the phosphoenolpyruvate carboxykinase gene promoter." @default.
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- W1968085816 doi "https://doi.org/10.1210/mend.8.5.8058068" @default.
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