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- W107693689 abstract "The stage and tissue specific expression of milk protein genes in the mammary gland is controlled by modular response regions with multiple binding sites for distinct classes of transcription factors, which either co-operate or are antagonistic. In addition, the activity of some of these factors is individually control-led by diverse extracellular signals. A well studied paradigm for a synergistic co-operation is the activation of beta-casein gene transcription by prolactin and glucocorticoids mediated by the signal transducer and activator of transcription STAT5 and the glucocorticoid receptor (GR). As an example for an antagonistic interaction we can demonstrate inhibition of prolactin signalling by TNF-alpha, which is mediated by NF-kappa B. In both cases, the interactions occur at several levels: For GR and STAT5, the synergy is discussed to be promoted by protein-protein interactions. Furthermore, we can demonstrate a co-operation between GR and STAT5 in DNA binding by a mechanism, which is dependent on the integrity of the DNA binding domain of the GR and on the existence of half-palindromic GR binding sites in the hormone response region. Indirect effects of glucocorticoids by modulation of the expression of secondary genes are also important. They might account for the observed enhancement of prolactin induced tyrosine phosphorylation of STAT5 by glucocorticoids. For NF-kappa B and STAT5, one component of the antagonism is the inhibition of STAT5 tyrosine phosphorylation by activation of NF-kappa B. Another potential mechanism is the inhibition of DNA binding of STAT5 due to overlapping binding sites for STAT5 and NF-kappa B in the beta-casein gene promoter. Thus, synergistic and antagonistic interactions between GR, NF-kappa B, and STAT5 involve (a) cross-talk mechanisms influencing the activation of STAT5 and (b) promoter-dependent interactions modulating the DNA binding activity of the transcription factors." @default.
- W107693689 created "2016-06-24" @default.
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- W107693689 date "2005-11-21" @default.
- W107693689 modified "2023-10-14" @default.
- W107693689 title "Synergistic and Antagonistic Interactions of Transcription Factors in the Regulation of Milk Protein Gene Expression" @default.
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- W107693689 doi "https://doi.org/10.1007/0-306-46832-8_17" @default.
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