In the mouse, the attachment reaction between the blastocyst trophectoderm and the receptive uterine luminal epithelium occurs at 2200-2300 h on day 4 of pregnancy and is rapidly followed by transformation of stromal cells into decidual cells (decidual cell reaction). This process can also be induced experimentally (deciduoma) by intraluminal oil infusion in the uterus on day 4 of pseudopregnancy. The decidual cell reaction is associated with up- and down-regulation of many genes in a cell-specific manner. Using mRNA differential display, we identified cyclin D3 as one of the genes that is upregulated in the uterus at the sites of blastocyst apposition during the attachment reaction. The levels of expression were low in the morning of days 1-4 as determined by Northern hybridization. In situ hybridization analysis showed that on days 1 and 2, signals were primarily localized in uterine epithelial cells, while signals were detected in both the stromal and epithelial cells on days 3 and 4. In contrast, with the initiation and progression of decidualization on days 5, 6 and 7, the levels of cyclin D3 mRNA were remarkably upregulated in stromal cells both at the mesometrial and the antimesometrial poles. However, on day 8, signals were primarily localized in stromal cells at the mesometrial decidual bed. Implanting blastocysts on these days also expressed cyclin D3 mRNA. In the progesterone-treated delayed implanting mice, the uterine levels of cyclin D3 mRNA were modest at the sites of blastocyst apposition, but were upregulated with the onset of implantation by estradiol-17beta. However, the decidual expression of cyclin D3 mRNA was not dependent on the presence of blastocysts, since increased expression also occurred in experimentally induced deciduoma in the absence of blastocysts. The importance of cyclin D3 in decidualization was further examined in Hoxa-10-deficient mice which show defective decidualization. The expression of cyclin D3 mRNA in Hoxa-10(-/-) uteri on day 5 was severely compromised after application of a deciduogenic stimulus on day 4 of pseudopregnancy. Collectively, the results suggest that cyclin D3 could be important for the process of decidualization.

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