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- W2072322981 abstract "Progesterone stimulation of the estradiol (E2)-primed human endometrium initiates DZ of the stromal cells around the spiral arterioles. Under continued steroid stimulation, DZ spreads wave-like to establish the decidual cell as a major cell type of the luteal phase and pregnant endometrium. Because of their widespread distribution throughout the endometrium and concentration at perivascular sites, decidual cells are spatially and temporally positioned to mediate the opposing requirements of maintaining hemostasis during endovascular trophoblast invasion, yet promoting menstrual hemorrhage in the absence of implantation. The experimental results summarized in this review indicate that the paradoxical properties manifested by endometrial stromal/decidual cells are controlled by several proteins with either hemostatic or ECM-degrading or vasoactive activity, and that their expression is altered in response to changes in levels of circulating ovarian steroids during the menstrual cycle. These conclusions are drawn primarily from studies with a well-characterized in vitro model of DZ using monolayers of stromal cells derived from specimens of predecidualized endometrium. Thus, progestins modify the expression of several DZ-related markers in the cultured stromal cells, and E2 enhances these effects despite the lack of response to E2 alone. These responses are consistent with the differential actions displayed by E2 and progesterone in vivo, by which E2 primes the endometrium for the decidualizing effects of progesterone by elevating progesterone receptor levels. Accordingly, during steroid-induced in vitro DZ, a marked increase in the expression of stromal cell TF and PAI-1 and reciprocal inhibition of tPA activity suggest mechanisms to account for the absence of hemorrhage during invasion of the endometrial vasculature by implanting trophoblasts. In contrast to steroid-induced DZ, the events of menstruation are initiated in response to a decline in circulating levels of ovarian steroids. Accordingly, subjecting in vitro decidualized stromal cells to steroid withdrawal results in pronounced reversal in the expression of all of the end points listed above. Consequently, the local hemostatic environment is transformed into a hemorrhage-promoting milieu. Taken together with vascular injury resulting from ischemia induced by spiral artery vasoconstriction, the net effect is attainment of two prerequisites for menstrual hemorrhage, vascular injury and inadequate hemostasis." @default.
- W2072322981 created "2016-06-24" @default.
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- W2072322981 date "1997-09-01" @default.
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- W2072322981 title "Decidual Cell Regulation of Hemostasis during Implantation and Menstruation" @default.
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- W2072322981 doi "https://doi.org/10.1111/j.1749-6632.1997.tb48539.x" @default.
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