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- W2057804569 abstract "Human placental trophoblasts contain 3, 5, 3'-triiodo-L-thyronine (T3) nuclear receptors not only at term but all throughout pregnancy. We determined which of the trophoblast, cytotrophoblast (C-cell) or syncytiotrophoblasts (S-cell) respond to thyroid hormone, and whether the T3 binding capacity changes with placental aging. Nuclear protein of mononuclear cells purified from term chorionic tissue by enzymatic digestion and Percoll gradient centrifugation had an apparent association constant (Ka) of 5.2× 109M-1 and a binding capacity of 445 fmol T3/mg DNA, 8 times greater than that of term trophoblasts. Primary harvested mononuclear cells reacted against neither anti-hCG-β nor and-hPL antibodies, although some of them reacted immunocytochemically against anti-hCG-α antibody. These cells aggregated with each other and transformed into multinuclear cells in culture after 96 hrs of incubation, showing that these primary harvested cells were C cells that had morphologically transformed into S cells. The transformed cells secreted hCG and hPL and immunocytochemically stained for these makers, suggesting that the C cells had functionally transformed into S cells. Nuclear binding of T3 in trophoblastic tissue is present not only at tuna but throughout pregnancy. Although each nuclei had a similar Ka value, the binding capacity decreased towards term. These findings suggest that nuclear T3 receptors of placental trophoblast change with placental aging and this change is mainly due to the change in the C/S cell ratio. We concluded that the cytotrophoblast is an active target cell of thyroid hormone." @default.
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- W2057804569 date "1989-01-01" @default.
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- W2057804569 title "Studies on the Nuclear 3,5,3'-Triiodo-L-Thyronine Binding Sites in Cytotrophoblast." @default.
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- W2057804569 doi "https://doi.org/10.1507/endocrj1954.36.891" @default.
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