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In Vitro Culturing of Human Trophoblasts from Term Placenta.
Since the early 1960s, researchers began culturing placental cells to establish an in vitro model to study the biology of human trophoblasts, including their ability to differentiate into syncytiotrophoblasts and secrete steroid and peptide hormones that help sustain a viable pregnancy. This task was addressed by testing different serum concentrations, cell culture media, digestive enzymes, growth factors, substrate coating with diverse proteins from the extracellular matrix, and so on. Among the many methodological challenges, the contamination of trophoblasts with other cell types, such as immune and stromal cells, was a matter of concern. However, introducing the Percoll gradient to isolate cytotrophoblasts was an excellent contribution, and later, the depletion of contaminating cells by using magnetic bead-conjugated antibodies also helped increase the purity of cytotrophoblasts. Herein, with some modifications, we describe a rapid and easy method for cytotrophoblast isolation from the term human placenta based on the previously reported method by Harvey Kliman et al. (Endocrinology 118:1567-1582, 1986). This method yields about 40-90 million cells from a single placenta, with a purity of around 85-90%.
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