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Nonviral gene delivery systems are useful for basic research in trophoblasts. In these systems, gene expression is regulated by a cassette of regulatory elements within the plasmid, and the transcriptional activity differs among cell lines. In the present study, we used BeWo and JAR human trophoblast cell lines to systematically compare the transcriptional activities of several expression cassettes...
The transfer of genes of interest is a useful method for studying placental biology. Recombinant adenovirus (Ad) vector is an efficient vector for transgene expression. An interaction between the fiber of Ad and the coxsackievirus and adenovirus receptor on the cell membrane is the first step in infection. We previously developed fiber-modified Ad vectors and showed that they improved transgene activity...
The presence of an extrahypothalamic gonadotropin releasing hormone (GnRH) in human placenta is well known and this decapeptide is presumed to play an important role in the regulation of the function and growth of human placenta. Immunohistochemistry showed that neutral endopeptidase 24.11 (NEP), a candidate of the responsible enzyme of GnRH degradation, is highly expressed on the cell surface of...
Using cultured BeWo cells as a model of human trophoblast, we investigated whether carrier-mediated transport of folic acid occurs. BeWo cells, which were derived from human choriocarcinoma, were cultured on a tissue culture plate or in a permeation chamber. When the cells reached confluence, drug uptake or transport experiments were performed. The uptake of [ 3 H]folic acid by BeWo cells...
Ras GTPase-activating protein (GAP), an important downregulator of Ras activity, has previously been shown to be abundant in human placenta. The expression of p120 and p100 isoforms of GAP in human normal chorionic villi (n=5) and hydatidiform mole (n=5) was investigated to clarify the involvement of Ras GAP in the growth of chorionic villi in the first trimester of pregnancy. Immunoblot analysis...
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