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• W1980638951 abstract "Estradiol (E) primes human endometrial stromal cells (HESCs) for the decidualizing effects of progesterone in vivo and in vitro. Matrix metalloproteinase (MMP) expression was evaluated in confluent HESCs incubated in control medium, and in medium supplemented with either E, or the synthetic progestin medroxyprogesterone acetate (P), or E + P. Measurements with a specific ELISA indicated that basal pro-MMP-1 output was unaffected by E, whereas E + P, which induces the expression of several decidualization-related markers, produced a time-dependent inhibition in HESC-secreted levels of pro-MMP-1. Consistent with progestin inhibition of MMP-1 protein expression in the HESCs, P but not E, reduced steady state levels of MMP-1 messenger RNA (mRNA) as determined by Northern analysis. By contrast, mRNA levels for MMP-2 and the MMP inhibitor TIMP-1 were not altered by either P or E. Steroid withdrawal studies indicated that after MMP-1 expression was suppressed by incubation of the HESCs with E + P, 4 days of exposure to the antiprogestin RU 486 (mifepristone) significantly up-regulated MMP-1 levels in the conditioned medium by severalfold compared with cultures maintained in E + P. The change to steroid-free control medium required a more prolonged period of withdrawal to attain up regulatory effects that were comparable with those evoked by RU 486. The ELISA measurements were validated by immunoblot analysis with a specific MMP-1 antibody, which showed corresponding changes in a band at the expected mobility of about 50 kDa. Moreover, Northern analysis revealed parallel changes in MMP-1 mRNA levels, whereas neither MMP-2 nor TIMP-1 mRNA levels were modulated by adding or withdrawing steroids. The contrast between regulated MMP-1 expression and constitutive MMP-2 expression observed in the cultured HESCs is consistent with the demonstrated presence on the MMP-1 promoter of regulatory elements such as AP-1 and PEA-3 that are absent from the MMP-2 promoter. Extrapolation of these in vitro changes in HESCs to in vivo endometrial events suggests that: 1) inhibition of MMP-1 expression by E and progesterone would stabilize the perivascular endometrial ECM to prevent local hemorrhage during endovascular invasion by the implanting trophoblast; 2) enhanced expression of MMP-1 evoked by steroid withdrawal would mediate endometrial ECM degradation leading to sloughing of the functional layer during menstruation." @default.
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• W1980638951 date "1998-11-01" @default.
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• W1980638951 title "Matrix Metalloproteinase and Matrix Metalloproteinase Inhibitor Expression in Endometrial Stromal Cells during Progestin-Initiated Decidualization and Menstruation-Related Progestin Withdrawal**This work was supported in part by grants from the National Institutes of Health R29-HD29540–01A1 and HD-94–23 (to C.J.L.). Portions of this work were presented at the 44th Annual Meeting of the Society for Gynecologic Investigation. (Lockwood CJ, Krikun G, Hausknecht V, Wang E-Y, Ziegler D, Schatz F, …" @default.
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• W1980638951 doi "https://doi.org/10.1210/endo.139.11.6304" @default.
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