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• W2041079834 abstract "During pregnancy, the trophoblast, supporting the main functions of the placenta, develops from the fusion of cytotrophoblastic cells into a syncytiotrophoblast. Gap junction channels consisting of connexins link the cytosols of cells in contact. Gap junctional communication has been involved in the control of cell and tissue differentiation. Recently, a gap junctional communication was demonstrated in trophoblast cell culture by means of the fluorescence recovery after photobleaching (gap-FRAP) technique. This gap junctional communication appeared to be stimulated by human chorionic gonadotropin (hCG). Therefore, the specificity of hCG action and the signalling mechanisms implicated in gap junctional communication were investigated by means of gap-FRAP. In culture, cytotrophoblastic cells develop into cellular aggregates, then into a syncytium, within 1-2 days after plating. During this in vitro differentiation, gap junctional communication was measured, and the maximum percentage of coupling between adjacent cells occurred on the fourth day. In the presence of 500 mIU/ml hCG, the percentage of coupled cells was increased at all stages of culture, and the highest proportion of coupled cells was observed after 2 days instead of 4 days in control conditions. The hCG action was specific, since the addition of heat-inactivated hCG of oFSH or of bTSH did not affect gap junctional communication in trophoblastic cells. The addition of a polyclonal hCG antibody decreased basal gap junctional communication as well as the response to exogenous hCG. Moreover, the presence of 8Br-cAMP (0.5 or 1 mM) mimicked the stimulation by hCG. Interestingly, H89 (2 microM), a specific protein kinase-A inhibitor, dramatically decreased the responses to hCG (500 mIU/ml) and the 8Br-cAMP (0.5 mM) stimulation of trophoblastic gap junctional communication. Calphostin (1 or 2 microM), a specific protein kinase-C inhibitor, strongly stimulated gap junctional communication. In conclusion, the demonstration by means of the gap-FRAP method of a gap junctional communication preceding cellular fusion could be considered as an objective and physiological criterion to mark the beginning of trophoblast differentiation. hCG, a hormone produced by the trophoblast, and two signalling mechanisms are implicated in this phenomenon." @default.
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• W2041079834 date "1997-07-01" @default.
• W2041079834 modified "2023-10-18" @default.
• W2041079834 title "Regulation of gap junctional communication during human trophoblast differentiation" @default.
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• W2041079834 doi "https://doi.org/10.1002/(sici)1097-0029(19970701/15)38:1/2<21::aid-jemt4>3.0.co;2-x" @default.
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