title: Expression and regulation of Dickkopf2 during periimplantation in mice.
abstract: Successful implantation depends on active dialogue between the maternal endometrium and the implanting blastocysts that is well controlled by groups of regulators at the molecular level. Dickkopf2 (Dkk2) is a member of Dickkopf family normally acting as an antagonist of canonical Wnt/beta-catenin signaling, which has been proven to participate in tumorigenesis and early embryo development. In order to explore the potential function of Dkk2 in embryo implantation, the present study investigated the uterine expression and regulation profiles of Dkk2 during periimplantation in mice. Using reverse transcription-polymerase chain reaction, immunohistochemistry and Western blotting, we showed that the mRNA and protein levels of Dkk2 began to increase in the glandular epithelium on day 4, continued to increase on day 5 and then decreased from day 6 of pregnancy. Moreover, on days 5-8 of pregnancy, Dkk2 was increasingly expressed in the deciduum of the uterus, especially around the implanting embryos. In addition, upregulation of Dkk2 was also observed in uteri treated with estrogen (estradiol-17beta) as well as in oil-induced artificial decidualization, indicating that the expression of Dkk2 could be induced by both steroid hormone (estrogen) and the process of decidualization. Furthermore, in the postimplantation uterus, the Dkk2 protein showed an inversed expression with active beta-catenin from day 6 onward, supporting the notion that Dkk2 plays an inhibitory role against canonical Wnt signaling in the context of the decidualizing stroma. Collectively, our data suggests that Dkk2 expression is associated with uterine receptivity changes as well as the process of decidualization and that it might play important roles through inhibition of canonical Wnt signaling in the periimplantation uterus.
authors.affiliation: State Key Laboratory of Reproductive Biology, Institute of Zoology, Chinese Academy of Sciences, Beijing, China.
authors.forename: Ying
authors.initials: Y
authors.lastname: Zhang
authors.forename: Sha
authors.initials: S
authors.lastname: Peng
authors.forename: Haibin
authors.initials: H
authors.lastname: Kuang
authors.forename: Qi
authors.initials: Q
authors.lastname: Chen
authors.forename: Shuang
authors.initials: S
authors.lastname: Liu
authors.forename: Li
authors.initials: L
authors.lastname: Zhang
authors.forename: Enkui
authors.initials: E
authors.lastname: Duan
mesh_terms: D000818:Animals; D021461:Animals, Outbred Strains; D003656:Decidua / Q000187:drug effects / Q000378:metabolism; D010064:Embryo Implantation / Q000187:drug effects / Q000235:genetics* / Q000502:physiology; D005260:Female; D005786:Gene Expression Regulation / Q000187:drug effects; D012739:Gonadal Steroid Hormones / Q000494:pharmacology; D036341:Intercellular Signaling Peptides and Proteins / Q000235:genetics* / Q000378:metabolism; D008297:Male; D051379:Mice; D011247:Pregnancy; D011270:Pregnancy, Animal; D015398:Signal Transduction / Q000187:drug effects / Q000235:genetics; D014599:Uterus / Q000187:drug effects / Q000378:metabolism; D051153:Wnt Proteins / Q000378:metabolism / Q000502:physiology; D051176:beta Catenin / Q000378:metabolism
chemical_list: C405060:Dkk2 protein, mouse; D012739:Gonadal Steroid Hormones; D036341:Intercellular Signaling Peptides and Proteins; D051153:Wnt Proteins; D051176:beta Catenin