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Department of Molecular and Integrative Physiology (M.K.B.), Department of Veterinary Biosciences (Y.-P.C., Q.L., I.C.B.), University of Illinois at Urbana-Champaign, Urbana, Illinois 61801; and Department of Molecular and Cellular Biology (X.X., F.J.D.), Baylor College of Medicine, Houston, Texas 77030
Address all corresponence and requests for reprints to: Dr. Milan Bagchi, Department of Molecular and Integrative Physiology, School of Molecular and Cellular Biology, University of Illinois at Urbana-Champaign, 534 Burrill Hall, MC-114, 407 South Goodwin Avenue, Urbana, Illinois 61801. E-mail: mbagchi{at}life.uiuc.edu.
The cellular actions of steroid hormone progesterone (P) are mediated via its nuclear receptors, which regulate the expression of specific target genes. The identity of gene networks that are regulated by the P receptors (PRs) in the uterus at various stages of the reproductive cycle and pregnancy, however, remain largely unknown. In this study, we have used oligonucleotide microarrays to identify mRNAs whose expression in the pregnant mouse uterus is modulated by RU486, a well-characterized PR antagonist, which is also an effective inhibitor of implantation. We found that, in response to RU486, expression of mRNAs corresponding to 78 known genes was down-regulated at least 2-fold in the preimplantation mouse uterus. The PR regulation of several of these genes was ascertained by administering P to ovariectomized wild-type and PR knockout (PRKO) mice. Detailed spatio-temporal analysis of these genes in the pregnant uterus indicated that their expression in the epithelium and stroma could be correlated with the expression of PR in those cell types. Furthermore, time-course studies suggested that many of these genes are likely primary targets of PR regulation. We also identified 70 known genes that were up-regulated at least 2-fold in the pregnant uterus in response to RU486. Interestingly, initial examination of a number of RU486-inducible genes reveals that their uterine expression is also regulated by estrogen. The identification of several novel PR-regulated gene pathways in the reproductive tract is an important step toward understanding how P regulates the physiological events leading to implantation.
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