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Department of Cell Biology, Vanderbilt University School of Medicine (L.H.H., G.E.O.), Nashville, Tennessee 37232; the Department of Biochemistry and Molecular Biology, M. D. Anderson Cancer Center (D.D.C.), Houston, Texas 77030; and the Department of Cell Biology and Biochemistry, Texas Tech University Health Sciences Center (B.S.C.), Lubbock, Texas 79430
Address all correspondence and requests for reprints to: Dr. Loren H. Hoffman, Department of Cell Biology, Vanderbilt University School of Medicine, Nashville, Tennessee 37232. E-mail: loren.hoffman{at}mcmail
Mammalian uteri are unreceptive to blastocyst implantation except during a relatively brief period. The transmembrane, cell surface mucin, Muc1, is present on epithelial cells of nonreceptive uteri in various species and has been demonstrated to have antiadhesive properties. These activities of Muc1 may prevent interaction of the embryonic trophoblast cells with the uterine epithelium. A previous study indicated that Muc1 expression in the rabbit, as in primates, is up-regulated by progesterone. This response would be expected to create a nonadhesive uterine surface during the progesterone-dominated receptive phase. In the current study, Northern blot analysis was used to evaluate Muc1 messenger RNA expression in the endometrium of estrous and progesterone-treated estrous rabbits and in endometrium from different stages of pregnancy or pseudopregnancy. Steady state levels of Muc1 messenger RNA were increased 10-fold when estrous animals were treated with progesterone for 5 days. Muc1 message was elevated 2- to 6-fold over estrous levels in endometrium of pseudopregnant females and 30-fold in preimplantation stage (6.75 days postcoitum) uteri. During implantation (7.25 day postcoitum), the high level of Muc1 expression continued in nonimplantation regions, but was dramatically reduced in endometrium from implantation sites. Using immunofluorescence localization, Muc1 protein was present on the apical surface of epithelial cells of estrous, pseudopregnant (4 and 6.75 days), preimplantation (6.75 days), and implantation (7.25 day) stage uteri. At the latter stage, luminal epithelium apposed to blastocysts had a marked reduction or absence of Muc1 immunostaining. Muc1-immunoreactive cells included luminal and cryptal epithelium in pregnant/pseudopregnant uteri, whereas the glandular cells stained weakly. Short term coculture of uterine epithelial cells with trophoblastic vesicles derived from 6.75-day blastocysts also resulted in a local reduction in apical epithelial Muc1 staining. These findings demonstrate that Muc1 expression is up-regulated by progesterone in the rabbit uterine epithelium and increases incrementally during pre- and periimplantation stages. Removal of Muc1 from the epithelial surface at implantation sites is accomplished locally via signals apparently produced by the blastocyst.
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