gonadotrophin

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gonadotropin

 [go´nah-do-tro″pin]
any hormone having a stimulating effect on the gonads. Two such hormones are secreted by the anterior pituitary gland: follicle-stimulating hormone and luteinizing hormone, both of which are active, but with differing effects, in the two sexes. Called also gonadotropic hormone.
chorionic gonadotropin (human chorionic gonadotropin (HCG) (hCG))
1. a glycopeptide hormone that is produced by cells of the fetal placenta and maintains the function of the corpus luteum during the first few weeks of pregnancy. It is thought to promote steroidogenesis in the fetoplacental unit and to stimulate fetal testicular secretion of testosterone. It can be detected by immunoassay in the maternal urine within days after fertilization; this provides the basis for the most commonly used pregnancy test.
2. the same principle obtained from the urine of pregnant women, used in treatment of certain cases of cryptorchidism and male hypogonadism, to induce ovulation and pregnancy in certain infertile, anovulatory women, and to increase the numbers of oocytes for patients attempting conception using assisted reproductive technologies such as gamete intrafallopian transfer or in vitro fertilization; administered intramuscularly. See also choriogonadotropin alfa.

go·nad·o·tro·pin

(gō'nad-ō-trō'pin, gon'ă-dō-),
1. A hormone capable of promoting gonadal growth and function; such effects, as exerted by a single hormone, are usually limited to discrete functions or histologic components of a gonad, such as stimulation of follicular growth or of androgen formation; most gonadotropins exert their effects in both genders, although the effect of a given gonadotropin will differ in males and females.
2. Any hormone that stimulates gonadal function.
3. Any substance that has the combined effects of follicle-stimulating hormone and luteinizing hormone.

go·nad·o·tro·pin

(gō-nad'ō-trō'pin)
1. A hormone capable of promoting gonadal growth and function; such effects, as exerted by a single hormone, usually are limited to discrete functions or histologic components of a gonad, such as stimulation of follicular growth or of androgen formation; most gonadotropins exert their effects in both sexes, although the effect of a given gonadotropin will differ in males and females.
Synonym(s): gonadotrophin.
2. Any hormone that stimulates gonadal function.
3. Any substance that has the combined effects of follicle-stimulating hormone and luteinizing hormone.

gonadotrophin

or

gonadotrophic hormones

hormones secreted by the anterior lobe of the PITUITARY GLAND and in some mammals, once pregnancy is under way, by the PLACENTA. FSH and LH are produced by all TETRAPODS though FSH appears to be absent in fish. LTH (Luteotrophin) is present in rats and maintains the CORPUS LUTEUM though it is absent in other mammals. Prolactin is present in some vertebrates and controls milk production (LTH is a form of prolactin). Pituitary output is controlled by the hypothalamus. Gonadotrophins influence other glands connected with reproduction, controlling the activity of the gonads, the onset of sexual maturity, OESTROUS CYCLES, breeding rhythms and LACTATION. See also HCG.

Gonadotrophin

Hormones that stimulate the ovary and testicles.
Mentioned in: Klinefelter Syndrome

gonadotrophin

; gonadotropin hormone secreted by both sexes; promotes gonadal growth and function
  • anterior pituitary gonadotrophin pituitary gonadotrophic hormone of hypophyseal origin

  • chorionic gonadotrophin; CG; human chorionic gonadotrophin; hCG placental hormone, excreted in urine of pregnant women

gonadotrophin (gōnad´ōtrōf´in),

gonadotrophin

References in periodicals archive ?
Use of gonadotropin releasing hormone antagonists to overcome the drawbacks of intrauterine insemination on weekends.
IUI and ovarian stimulation with gonadotropins is offered to patients with PCOS who are resistant to or have failed to achieve pregnancy with clomiphene citrate (CC), and cumulative live birth rates up to 71% are reported to be achieved in patients with PCOS.
Clomiphene citrate in combination with gonadotropins for controlled ovarian stimulation in women undergoing in vitro fertilization.
The onset of male puberty takes place when the hypothalamus begins to secrete gonadotropin releasing hormone (GnRH), which causes the pituitary to release luteinizing hormone (LH) and follicle stimulating hormone (FSH) that stimulate the growth of the testes.
Among the different protocols for COH, the use of the GnRH analog plus gonadotropins (long protocol or standard protocol) is popular, owing to its more favorable results.
Although the patients cannot be randomized in a retrospective analysis such as this and the administered gonadotropins were different, the similarity in the baseline characteristics of the groups can make it possible to compare the outcomes.
sup][13] Our data show that males with CDP show an increase in LH levels after GnRH stimulation, which distinguishes them from patients with gonadotropin deficiency.
Increase in gonadotropins was observed with GnRH test in a portion of the cases.
Immunoassay of human chorionic gonadotropin, its free subunits, and metabolites.
Included in these treatments is the use of human chorionic gonadotropin for the treatment of obesity.
KEYWORDS: Gonadotropin (s), Chorionic; Obesity; Adipose tissue metabolism; fat; overweight; betaendorphin; lypolisis; lipogenesis.