However, the practitioner should remember that testosterone replacement itself can render the testicles atrophic and dysfunctional, if it has long suppressed pituitary gonadotrophic
Materials: Androstenedione, Diethylstilbestrol (DES), equine chorionic gonadotrophic
(eCG) and human chorionic gonadotrophic
(hCG) hormones, follicle stimulating hormone (FSH), Hanks Balanced Salt Solution (HBSS), Dulbecco's Minimal Essential Medium (DMEM-F12), penicillin/ streptomycin, trypsin-EDTA, poly-L-lysine and 18a glycyrrhetinic acid (18[alpha]GA) were purchased from Sigma Chemical Co.
It might be concluded that the quality of embryos in Local, Pabna and F x L genetic groups were independent of FSH dose levels, rather it might be attributed to the usual variation in superovulation response within and between the donors, physiological status, age and body weight of individual donor, range of ovulation in superovulation, the lot and batch number of the gonadotrophic
hormone used and the day of embryo recovery.
In fact, insulin possesses true gonadotrophic
function and an increased insulin availability at the level of ovarian tissue may favour excess androgen synthesis.
Normally, two gonadotrophic
hormones (GTH) produced by the hypothalamus and anterior pituitary gland (luteinising hormone (LH) and follicle stimulating hormone (FSH)) stimulate the testes to produce testosterone and spermatozoa (sperm cells) respectively.
Developmental capacity of mouse oocytes matured in vitro:effects of gonadotrophic
stimulation, follicular origin and oocyte size.
This relationship between the central nervous system and a gonadotrophic
gland is not unique to the pulmonate gastropods.
Testosterone levels in men increase during sleep rising from trough levels at 2000 h to peak levels at 0800 h, but no clear relation has been demonstrated between the levels of gonadotrophic
hormones and the sleep-wake cycle in children or adults.
The mechanism of action and metabolism of gonadotrophic
hormones in the organism.
GnRH stimulates the release of two gonadotrophic
hormones (gonadotropins) from the anterior pituitary gland: luteinizing hormone (LH) and follicle-stimulating hormone (FSH).
migratoria by daily injections of 20E in adult females would suggest that ecdysteroids could also have a gonadotrophic
action in locusts (Girardie & Girardie 1996).
The pubertal growth spurt can be defined as the 2-3 year period of rapid increase in height and weight related to the change in the activity of the hypothalamus with a gradual increase in the secretion of gonadotrophic
releasing hormone (GnRH).
Morphometrical and ultrastructural analyses of hypophyseal cells from adult monkeys fed a protein-restricted diet containing 10% protein have shown a decline in the number of somatotrophic, lactotrophic, gonadotrophic
and tireotrophic cells.
Its main products are steroids, synthetic peptides, carbohydrates, gonadotrophic
hormones, insulins and heparin.
1994) and Lawrence (1996) confirmed the presence of a gonadotrophic
hormone from the prostomium that probably mediates oogenesis, and it seems likely that the hormone is secreted only under the appropriate regimes of photoperiod and temperature.