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- W2010747883 abstract "GnRH analog (GnRHa) and TGF-beta act directly on leiomyoma/myometrial smooth muscle cells (LSMCs and MSMCs) regulating diverse activities resulting in leiomyoma growth and regression. Because GnRH and TGF-beta receptor signaling is in part mediated through the MAPK pathway, we determined whether the contribution of MAPK/ERK and transcriptional activation of c-fos and c-jun, result in differential regulation of type I collagen, fibronectin, and plasminogen activator inhibitor 1 (PAI-1) gene expression, whose products are known to influence extracellular matrix turnover, which is critical in leiomyoma growth and GnRHa-induced regression. We found that GnRHa and TGF-beta in a dose- and time-dependent manner increased the level of phosphorylated ERK1/2 (pERK1/2) in LSMCs and MSMCs. GnRHa and TGF-beta increased ERK1/2 nuclear accumulation resulting in differential regulation of c-fos and c-jun mRNA expression via downstream signaling from MAPK kinase (MEK)1/2, because pretreatment with U0126, a synthetic inhibitor of MEK1/2, abolished basal and GnRHa- and TGF-beta-induced pERK1/2 and the expression of c-fos and c-jun. LSMCs and MSMCs also express fibronectin, type I collagen, and PAI-1 mRNA, and GnRHa and TGF-beta altered their expression in a cell-specific manner through MEK1/2. We concluded that GnRHa and TGF-beta acting through a MAPK/ERK pathway and transcriptional activation of c-fos/c-jun results in differential regulation of specific genes whose products may in part influence the outcome of leiomyoma growth and regression." @default.
- W2010747883 created "2016-06-24" @default.
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- W2010747883 date "2004-11-01" @default.
- W2010747883 modified "2023-09-25" @default.
- W2010747883 title "Gonadotropin Releasing Hormone and Transforming Growth Factor β Activate Mitogen-Activated Protein Kinase/Extracellularly Regulated Kinase and Differentially Regulate Fibronectin, Type I Collagen, and Plasminogen Activator Inhibitor-1 Expression in Leiomyoma and Myometrial Smooth Muscle Cells" @default.
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- W2010747883 doi "https://doi.org/10.1210/jc.2004-0161" @default.
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