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Egr2 mediates the differentiation of mouse uterine stromal cells responsiveness to HB-EGF during decidualization.
Although Egr2 is involved in regulating the folliculogenesis and ovulation, there is almost no data describing its physiological function in embryo implantation and decidualization. Here, we showed that Egr2 mRNA was distinctly accumulated in subluminal stromal cells around implanting blastocyst on day 5 of pregnancy as well as in estrogen-activated implantation uterus. Estrogen induced the expression of Egr2 in uterine epithelia. Elevated expression of Egr2 mRNA was also observed in the decidual cells. Silencing of Egr2 by specific siRNA weakened the proliferation of uterine stromal cells and reduced the expression of Ccnd1, Ccnd3, Cdk4, and Cdk6. Furthermore, Egr2 advanced the expression of Prl8a2, Prl3c1, and Pgr, the well-established differentiation markers for decidualization. Administration of exogenous recombinant heparin-binding EGF-like growth factor (rHB-EGF) to uterine stromal cells resulted in an increase in the level of Egr2 mRNA. Moreover, siRNA-mediated attenuation of Egr2 impeded the stimulation of HB-EGF on stromal cell differentiation. Knockdown of Egr2 led to a reduction in the expression of Cox-2, mPGES-1, Vegf, Trp53, and Mmp2. Further analysis found that Egr2 may serve as an intermediate to mediate the regulation of HB-EGF on Cox-2, mPGES-1, Vegf, Trp53, Mmp2, and Ccnd3. Collectively, Egr2 may play an important role during embryo implantation and decidualization.
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