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To date, the factors capable of regulating the coordinate expression of the urokinase-type plasminogen activator (uPA) and its endogenous inhibitor, plasminogen activator inhibitor (PAI-1), at the maternal-fetal interface remain poorly characterized. In these studies we examined the ability of the classical form of gonadotropin-releasing hormone (GnRH) I and the second, mammalian form of this hormone, GnRH II, to regulate uPA and PAI-1 mRNA and protein expression levels in cultures of stromal cells isolated from first trimester decidual tissues using quantitative competitive-PCR and ELISA, respectively. GnRH I and GnRH II increased uPA mRNA and protein expression levels in these primary cell cultures in a dose- and time-dependent manner. In contrast, GnRH I increased, whereas GnRH II decreased PAI-1 mRNA and protein expression levels in these cells. Cetrorelix, a GnRH receptor antagonist, inhibited the regulatory effects of GnRH I, but not GnRH II, on uPA and PAI-1 expression levels in these decidual stromal cell cultures. Taken together, these observations suggest that GnRH I and GnRH II differentially regulate the balance between uPA and PAI-1 expression levels in the human decidua, possibly via distinct receptor-mediated signaling pathways.

the journal of clinical endocrinology and metabolism/journal of clinical endocrinology and metabolism

Differential Effects of Gonadotropin-Releasing Hormone I and II on the Urokinase-Type Plasminogen Activator/Plasminogen Activator Inhibitor System in Human Decidual Stromal Cells in Vitro