Follicle-stimulating hormone secretion

Barraclough CA, Wise PM (1982) The role of catecholamines in the regulation of pituitary luteinizing hormone and follicle-stimulating hormone secretion. Endocrine Rev 5 91-119. 

Wenger, T., Rettori, V., Snyder, G.D., Dalterio, S., and McCann, S.M. (1987) Effects of delta-9-tetrahydro-cannabinol on the hypothalamic-pituitary control of luteinizing hormone and follicle-stimulating hormone secretion in adult male rats. Neuroendocrinology 46 488-493. 

Bronson F. and Maruniak J.A. (1976). Differential effects of male stimuli on follicle stimulating hormone, luteinising hormone and prolactin secretion in prepubertal female mice. Endocrinology 98, 1101-1108. 

McCann, S.M., Karanth, S., Mastronardi, C.A., Dees, W.L., Childs, G., Miller, B., Sower, S., and Yu, W.H. 2001. Control of gonadotrophin secretion by follicle stimulating hormone-releasing factor, luteinizing hormonereleasing hormone and leptin. Archives of Medical Research 32(6), 476-485. 

Epinephrine and norepinephrine stimulate the hypothalamus to secrete gonadotropin-releasing hormone, which stimulates the anterior pituitary to secrete bursts of gonadotropins, follicle-stimulating hormone (FSH), and luteinizing hormone (LH). 

Tdbar M, Ruiz A, Sanchez-Criado JE (1998) Involvement of estrogen and follicle-stimulating hormone on basal and luteinizing hormone (LH)-releasing hormone-stimulated LH secretion in RU486-induced 3-day estrous cycle in the rat. Biol Reprod 58 615-619... 

The plasma levels of luteinising and follicle-stimulating hormones and oestradiol are low. There can be a complete loss of pulsatile secretions of these hormones, or a loss of sleep-related pulsatile secretion, as occurs in puberty. 

Figure 19.11 Hormones secreted by the hypothalamus, anterior pituitary, ovary and testis and feedback regulation. GnRH is gonadotrophin-releasing hormone the gonadotrophins are follicle-stimulating hormone (FSH) and luteinising hormone (LH). The effect of these hormones on activities in the ovary and testes is shown. FSH stimulates synthesis and secretion of oestradiol from follicle, and spermatogenesis in testis. LH stimulates synthesis and secretion of progesterone from corpus luteum and synthesis and secretion of testosterone by the Leydig cells.

Estradiol subsequently builds up in the blood and first (within 2 to 12 hours) reduces the levels of follicle-stimulating hormone (FSH) and the amplitude of LH pulses, then (within 12 to 48 hours) causes preovulatory surges of LH and FSH. The former promotes ovulation and development of a corpus luteum (reviewed in Martin et ah, 1986). Two compounds have been indicated in the effect of the odor of ram s fleece on LH secretion in anestrous ewes. These are 1,2-hexadecanediol and 1,2-octadecanediol. In Merino sheep at least, maximum stimulation of ovulation requires full exposure to a ram, such as fenceline contact in pastures. Olfactory cues from the ram s wool, presented in a facemask for the ewe, are ineffective by themselves visual and tactile stimuli are also important. The Merino breed does not rely as much on olfactory cues as other breeds of sheep (Pearce and Oldham, 1988). The effect is not necessarily species specific hair extract from male goats stimulates LH release in ewes. For this effect, the accessory olfactory system is not necessary (Signoret etah, 1989). 

Thyrotropin (thyroid-stimulating hormone, TSH) and the related hormones lutropin (luteinizing hormone, LH) and follitropin (follicle-stimulating hormone, FSH) originate in the adenohypophysis. They are all dimeric glycoproteins with masses of around 28 kDa. Thyrotropin stimulates the synthesis and secretion of thyroxin by the thyroid gland. 

Fig. 2. Gonadotrophin releasing hormone (GnRH) released in pulses by the hypothalamus stimulates pituitary production and secretion of luteinizing hormone (LH) and follicle stimulating hormone (FSH). The hypothalamic-pituitary—gonadal (H-P-G) axis is affected by a variety of external hormones and external factors.

The adenohypophysis is the part of the gland in which the tropic hormones are secreted They include the adrenocorticotropic hormone lACTHl. die thyrotropic hormone (TSH). and. somatotropin, as well as three hormones with pronounced effects upon the gonads the hormone prolactin, the follicle-stimulating hormone tFSHl and the luteinizing or interstitial cell stimulating hormone tLH or ISCH)... 

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