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Regulation of pituitary gonadotropins by gonadotropin-releasing hormone, estradiol, progesterone, inhibin, and activin


, : Regulation of pituitary gonadotropins by gonadotropin-releasing hormone, estradiol, progesterone, inhibin, and activin. Gwatkin, R B L [Editor] Modern Cell Biology; Genes in mammalian reproduction : 247-269



Accession: 002477226

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Gregg, D.W.; Schwall, R.H.; Nett, T.M., 1991: Regulation of gonadotropin secretion and number of gonadotropin-releasing hormone receptors by inhibin, activin-A, and estradiol. Primary cultures of ovine pituitary cells were used to characterize the effects of inhibin and activin on the secretion of gonadotropins and on the regulation of number of GnRH receptors in the presence or absence of estradiol. Number of GnRH rece...

Weiss, J.; Crowley, W.F.; Halvorson, L.M.; Jameson, J.L., 1993: Perifusion of rat pituitary cells with gonadotropin-releasing hormone, activin, and inhibin reveals distinct effects on gonadotropin gene expression and secretion. Gonadotropin biosynthesis and secretion are influenced by pulsatile GnRH derived from the hypothalamus as well as by paracrine factors. In the current studies, we compared the effects of inhibin, activin, and GnRH, alone and in combination, on gon...

Moss, G.E.; Crowder, M.E.; Nett, T.M., 1981: Gonadotropin releasing hormone receptor interaction 6. effect of progesterone and estradiol on hypophyseal receptors for gonadotropin releasing hormone and serum and hypophyseal concentrations of gonadotropins in ovariectomized ewes. The effect of estradiol and progesterone on hypophyseal and serum concentrations of luteinizing hormone (LH) and FSH; hypothalamic content of gonadotropin releasing hormone (GnRH) and numbers of receptors for GnRH were examined in ovariectomized e...

Miyake, Y.I.hi; Hirata, T.I.hi; Osawa, T.; Watanabe, G.; Taya, K., 2000: Changes in peripheral follicle stimulating hormone , luteinizing hormone , inhibin, estradiol-17beta, progesterone and testosterone levels before and after the administration of equine chorionic gonadotropin , human chorionic gonadotropin and gonadotropin releasing hormone analogue in three cases of bovine gonadal hypoplasia. To clarify the endocrinological characteristics of bovine gonadal hypoplasia (XY female), peripheral FSH, LH, inhibin, estradiol-17beta (E2), progesterone (P) and testosterone (T) levels were measured before and after the administration of eCG, hC...

Miyake, Y.I.; Hirata, T.I.; Osawa, T.; Watanabe, G.; Taya, K., 2000: Changes in peripheral follicle stimulating hormone (FSH), luteinizing hormone (LH), inhibin, estradiol-17 beta , progesterone and testosterone levels before and after the administration of equine chorionic gonadotropin (eCG), human chorionic gonadotropin (hCG) and gonadotropin releasing hormone analogue (GnRH-A) in three cases of bovine gonadal hypoplasia (XY female). To clarify the endocrinological characteristics of bovine gonadal hypoplasia (XY female), peripheral FSH, LH, inhibin, estradiol-17 beta (E< sub>2</ sub>), progesterone (P) and testosterone (T) levels were measured before and after the...

Petraglia, F.; Vaughan, J.; Vale, W., 1989: Inhibin and activin modulate the release of gonadotropin-releasing hormone, human chorionic gonadotropin, and progesterone from cultured human placental cells. Although it is clear that human chorionic gonadotropin (hCG) and progesterone play fundamental roles in pregnancy, the regulation of placental production of these hormones remains to be defined. Recent evidence suggests that the human placenta exp...

Barkan A.L.; Duncan J.A.; Schiff M.; Papavasiliou S.; Garcia Rodriguez A.; Kelch R.P.; Marshall J.C., 1985: Opioid and neurotransmitter regulation of pituitary gonadotropin releasing hormone receptors in the ovariectomized estradiol treated rat role of altered gonadotropin releasing hormone secretion. An acute transient fall in the number of pituitary GnRH [gonadotropin-releasing hormone] receptors (GnRH-R) is observed before the preovulatory gonadotropin surge in cycling rats and before the afternoon daily gonadotropin surge in ovariectomized...

D.G.egorio, G.B.; Nett, T.M., 1995: Estradiol and progesterone influence the synthesis of gonadotropins in the absence of gonadotropin-releasing hormone in the ewe. Acute actions of estradiol and progesterone on synthesis and secretion of gonadotropins without the confounding effects of endogenous steroids and GnRH were examined by using the ovariectomized (OVX), hypothalamic-pituitary-disconnected (HPD) ewe....

Duncan J.A.; Barkan A.; Herbon L.; Marshall J.C., 1986: Regulation of pituitary gonadotropin releasing hormone receptors by pulsatile gonadotropin releasing hormone in female rats effects of estradiol and prolactin. GnRH has been shown to modulate the concentration of its own pituitary receptors (GnRH-R), and changes in GnRH-R during the rat estrous cycle may reflect changes in GnRH secretion. To examine the relationship between GnRH and GnRH-R in female rats...

Tilbrook, A.J.; de Kretser, D.M.; Clarke, I.J., 2001: Influence of the degree of stimulation of the pituitary by gonadotropin-releasing hormone on the action of inhibin and testosterone to suppress the secretion of the gonadotropins in rams. This experiment determined if the degree of stimulation of the pituitary gland by GnRH affects the suppressive actions of inhibin and testosterone on gonadotropin secretion in rams. Two groups (n=5) of castrated adult rams underwent hypothalamopit...