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- W2024131498 abstract "Previously, no inhibitors of placental differentiation have been described. In this study, we determined the effect of transforming growth factor beta 1 (TGF beta 1) on cytotrophoblast differentiation. Monolayer cultures of pure cytotrophoblasts were exposed to 0.001-10 ng/ml TGF beta 1 with and without the presence of 10 ng/ml epidermal growth factor (EGF), an inducer of placental differentiation. Over 7 days of culture, in 11 separate experiments, phase contrast microscopy demonstrated marked inhibition of EGF-induced syncytial formation by TGF beta 1. Basal human (h)CG and h-placental lactogen (PL) release were reduced compared to control by fractions of 0.75 (TGF beta 1/control) and 0.54, respectively. EGF alone induced fractional (EGF/control) increases in hCG and hPL release of 2.46 and 2.68, respectively. However, this stimulation was significantly inhibited by 10 ng/ml TGF beta 1. Dose-response studies showed that maximal TGF beta 1 inhibition of EGF-stimulated hormone secretion occurred at 0.1 ng/ml or more TGF beta 1. Partial differentiation (syncytium formation) occurred despite the presence of TGF beta 1, suggesting a portion of cytotrophoblasts were committed to differentiation at the time of culture. We conclude that TGF beta 1 acts as a major inhibitor of trophoblast differentiation and concomitant peptide hormone secretion." @default.
- W2024131498 created "2016-06-24" @default.
- W2024131498 creator A5011014468 @default.
- W2024131498 creator A5060578289 @default.
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- W2024131498 date "1991-07-01" @default.
- W2024131498 modified "2023-09-23" @default.
- W2024131498 title "Transforming Growth Factor β1 Inhibits Placental Differentiation and Human Chorionic Gonadotropin and Human Placental Lactogen Secretion" @default.
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- W2024131498 doi "https://doi.org/10.1210/endo-129-1-22" @default.
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