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Matrix metalloproteinases (MMPs) are implicated in the degradation of extracellular matrix; they play important roles in the invasion of the trophoblast cell into the maternal endometrium during placentation. Previous studies have concentrated on comparison of MMP expression in trophoblast cells between the first and third trimester. But the dynamic(More)
A cell line has been established from human placentae at the first trimester of normal pregnancy. The cell line was obtained by culture of purified cytotrophoblast cells in serum-free medium supplemented with epidermal growth factor, insulin, dexamethasone and 0.1% bovine serum albumin. The cells can be subcultured for >30 passages in one to three splits.(More)
The biosynthesis of ovarian aromatases and hence estrogen production are under the control of the gonadotropins, FSH and LH. Using a primary culture of rat granulosa cells, we now report that estrogens (diethylstilbestrol and 17 beta-estradiol) augment the stimulation of aromatase activity by FSH and LH. Moreover, clomiphene citrate, a drug widely used to(More)
The influence of estrogens on gonadotropin-stimulated production of progesterone and 20 alpha-hydroxypregn-4-en-3-one (20 alpha-OH-P) was examined in primary cultures of rat granulosa cells. Granulosa cells were cultured for 3 days with increasing concentrations of FSH in the presence or absence of either diethylstilbestrol (DES) or estradiol. FSH treatment(More)
The direct effects of GnRH and its agonistic and antagonistic analogs upon testicular androgen biosynthesis were studied in primary cultures of testicular cells obtained from adult hypophysectomized rats. Treatment of cultured cells with hCG (10 ng/ml) substantially increased testosterone production, while concomitant addition of GnRH or its agonist(More)
The activity of matrix metalloproteinases (MMPs) specifies the ability of the trophoblast cell to degrade extracellular matrix (ECM) substrates. Usually the process of normal human placentation involves a coordinated interaction between the fetal-derived trophoblast cells and their microenvironment in the uterus. In this study, the effects of ECM proteins(More)
The effects of growth factors were investigated on the proliferation of a normal placental cytotrophoblast cell line (NPC). Epidermal growth factor (EGF), transforming growth factor alpha (TGF alpha) and insulin-like growth factor-I (IGF-I) stimulated NPC cell proliferation. In contrast, TGFbeta1 was found to be a negative regulator, inhibiting EGF-induced(More)
Placental trophoblast cells are unique endocrine cells that play vital roles during the processes of embryonic implantation and placentation. However, research into the function of human trophoblast has been largely restrained mainly due to a lack of adequate cell models. A normal placenta-origin cytotrophoblast cell line (NPC) was previously established by(More)
The neuroanatomical distribution of androgen receptor (AR) mRNA-containing cells in the brain of a vocal lizard, Gekko gecko, was mapped using in situ hybridization. Particular attention was given to auditory and vocal nuclei. Within the auditory system, the cochlear nuclei, the central nucleus of the torus semicircularis, the nucleus medialis, and the(More)