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- W1955016051 endingPage "2664" @default.
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- W1955016051 abstract "An immortalized implantation site intermediate trophoblastic cell line, IST-1, was established from a human placenta of 7 weeks gestation. IST-1 cells phenotypically resembled the implantation site intermediate trophoblastic cells in situ and expressed Mel-CAM (MUC 18 or CD146). Mel-CAM is a cell adhesion molecule belonging to the immunoglobulin gene superfamily. It is involved in heterophilic cell-cell adhesion and plays a role in several biological processes including tumor progression. We have previously shown that Mel-CAM was highly expressed in the intermediate (extravillous) trophoblast in the human implantation site. In this study we determined the function of Mel-CAM in the interaction of trophoblast and uterine smooth muscle in the implantation site. IST-1 cells failed to adhere to immobilized recombinant Mel-CAM in solid phase whereas the uterine smooth muscle cells did. The presence of the putative Mel-CAM ligand in smooth muscle cells was further supported by the finding that Mel-CAM-transfected but not the mock-transfected U937 leukemia cells bind to the confluent monolayer of uterine smooth muscle cells. IST-1 cells attached efficiently to the monolayer of the uterine smooth muscle cells and acquired a spindle-shaped morphology simulating smooth muscle cells. The cell binding was only marginally affected by Mel-CAM blocking antibodies. However, Mel-CAM blocking antibodies and recombinant Mel-CAM promoted cell migration from IST-1 cell spheroids on the smooth muscle monolayer. Taken together, our results suggest that IST-1 cells express Mel-CAM but not the putative Mel-CAM ligand. In contrast, the uterine smooth muscle cells express the putative Mel-CAM ligand which binds to Mel-CAM on the surface of the IST-1 cells. The interaction between Mel-CAM and its putative ligand confers a stationary phenotype for trophoblastic cells. These observations are consistent with an important role for Mel-CAM in limiting trophoblastic migration within the myometrium in the implantation site." @default.
- W1955016051 created "2016-06-24" @default.
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- W1955016051 date "1998-09-01" @default.
- W1955016051 modified "2023-10-09" @default.
- W1955016051 title "Expression of Mel-CAM in implantation site intermediate trophoblastic cell line, IST-1, limits its migration on uterine smooth muscle cells" @default.
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- W1955016051 doi "https://doi.org/10.1242/jcs.111.17.2655" @default.
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