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 ?
Prolactin and gonadotrophin secretion in wild starlings (Sturnus vulgaris) during the annual cycle and in relation to nesting, incubation and rearing young.
The effect of dosages of gonadotrophin on ovarian stimulation and embryo production parameters was examined by one-way analysis of variance using SPSS software (version 16.
we do not claim that this experiment proves human chorionic gonadotrophin (HCG) causes regeneration of the spinal cord.
eCG injection commercially available as Serum Gonadotrophin (1000 IU) and PGF2a commercially sold as Cloprostenol Sodium Injection (0.
Induction of ovulation in quarter horse mares through the use of deslorelin acetate and human chorionic gonadotrophin (hCG).
The body begins to produce human chorionic gonadotrophin (hCG) after conception.
This can be accomplished by surgical castration or by medial suppression of testicular function with synthetic analogues of gonadotrophin releasing hormone4-8.
Shaw RW Evaluation of treatment with gonadotrophin release of harmone analogues.
A complete blood count and tests of renal and liver function and serum p-human chorionic gonadotrophin levels showed that these were within normal limits.
But her research has revealed that by looking at the amount of bleeding and the levels of the pregnancy hormone, human chorionic gonadotrophin (hCG), doctors could accurately predict the outcome.
PRL has being related to different physiologic functions such as promotion of labour, milk ejection, lactogenesis and behavior [24, 29],and furthermore, PRL has also being related with inhibition of the release of [beta]-endorphin from hypothalamic organ cultures while decreasing the secretion of gonadotrophin hormone-releasing hormone (GnRH) [5].