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We show here that RKIP is expressed in human normal and preeclampic placentas as detected by immunostaining. RKIP was detected in villous cytotrophoblast in normal placenta and switched to syncytiotrophoblast in pre\u2010eclampsia (PE)\u2010complicated pregnancies. RKIP was also localized in extravillous cytotrophoblast of cell islands and cell columns both in normal and in PE placentas, although staining was less uniform in the latter specimens. In order to test RKIP involvement in cytotrophoblast function, we performed in vitro studies on HTR\u20108\/SVneo cells, a first trimester cytotrophoblast cell line. We show that the RKIP inhibitor locostatin reduces ERK phosphorylation and impairs HTR\u20108\/SV neo cells motility in wound closure experiments. We also document the presence of GRK2 mRNA, the reduction of phosphorylated RKIP expression by locostatin and the induction of PAI mRNA expression in HTR\u20108\/SV neo cells, suggesting the involvement of GRK2 and NF\u2010kappaB pathways in these cells. In conclusion, our work provides evidence that RKIP is a novel factor expressed in cytotrophoblast cells where it likely regulates cell migration. J. Cell. Physiol. 227: 1821\u20131828, 2012. \u00a9 2011 Wiley Periodicals, Inc.<\/jats:p>","DOI":"10.1002\/jcp.22907","type":"journal-article","created":{"date-parts":[[2011,7,5]],"date-time":"2011-07-05T15:31:48Z","timestamp":1309879908000},"page":"1821-1828","source":"Crossref","is-referenced-by-count":19,"title":["Possible role of RKIP in cytotrophoblast migration: immunohistochemical and in vitro studies"],"prefix":"10.1002","volume":"227","author":[{"given":"Pasquapina","family":"Ciarmela","sequence":"first","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Daniela","family":"Marzioni","sequence":"additional","affiliation":[],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Md. 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