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- W2044243386 abstract "TGFbeta is a major regulator of extracellular matrix deposition and a potent inducer of type-1 plasminogen activator inhibitor (PAI-1) gene expression. We have reported that liganded glucocorticoid receptor (GR) represses TGFbeta transactivation of PAI-1 in Hep3B human hepatoma cells and that it interacts functionally and physically with the C-terminal activation domain of Smad3, a mediator of TGFbeta signaling. The ligand binding domain of GR is required for GR-mediated transrepression, but the GR DNA binding domain and activation function 1 domains are not. We report here that overexpression of steroid receptor coactivator-1 (SRC-1) and GR-interacting protein-1 (GRIP-1) enhanced repression by liganded GR, and by a GR mutant defective in repression. Surprisingly, SRC-1 and GRIP-1 also enhanced TGFbeta-induced activation from the TGFbeta-responsive sequence of the PAI-1 gene by a GR-independent mechanism. Coimmunoprecipitation and mammalian one-hybrid experiments demonstrated that SRC-1 and GRIP-1 interact physically with endogenous Smad3 and functionally with the C-terminal domain of Smad3 to directly enhance transcription. Thus, the GR coactivators, SRC-1 and GRIP-1, act as both corepressors of the glucocorticoid repression of PAI-1 gene transcription, and coactivators of TGFbeta-induced activation of the PAI-1 promoter." @default.
- W2044243386 created "2016-06-24" @default.
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- W2044243386 date "2006-05-01" @default.
- W2044243386 modified "2023-10-16" @default.
- W2044243386 title "Role of Steroid Receptor Coactivators in Glucocorticoid and Transforming Growth Factor β Regulation of Plasminogen Activator Inhibitor Gene Expression" @default.
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- W2044243386 doi "https://doi.org/10.1210/me.2005-0145" @default.
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