Journal of Endocrinology · 2017 · 14 citations · 22 references
Embryo implantation and decidualization are key steps for successful reproduction. Although numerous factors have been identified to be involved in embryo implantation and decidualization, the mechanisms underlying these processes are still unclear. Based on our preliminary data, Prss56, a trypsin-like serine protease, is strongly expressed at implantation site in mouse uterus. However, the expression, regulation and function of Prss56 during early pregnancy are still unknown. In mouse uterus, <i>Prss56</i> is strongly expressed in the subluminal stromal cells at implantation site on day 5 of pregnancy compared to inter-implantation site. Under delayed implantation, <i>Prss56</i> expression is undetected. After delayed implantation is activated by estrogen, Prss56 is obviously induced at implantation site. Under artificial decidualization, Prss56 signal is seen at the primary decidual zone at the initial stage of artificial decidualization. When stromal cells are induced for <i>in vitro</i> decidualization, <i>Prss56</i> expression is significantly elevated. <i>Dtprp</i> expression under <i>in vitro</i> decidualization is suppressed by <i>Prss56</i> siRNA. In cultured stromal cells, HB-EGF markedly stimulates <i>Prss56</i> expression through EGFR/ERK pathway. Based on promoter analysis, we also showed that Egr2 is involved in Prss56 regulation by HB-EGF. Collectively, <i>Prss56</i> expression at implantation site is modulated by HB-EGF/EGFR/ERK signaling pathway and involved in mouse decidualization.
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