Ovarian Steroidogenesis in the Proestrous Hamster
نویسندگان
چکیده
منابع مشابه
Calcium inhibits ovarian steroidogenesis in the blowfly Phormia regina.
Calcium is frequently involved in the stimulation of steroidogenesis in gonads and endocrine glands, generally in association with cAMP. However, our present observations show that it has the opposite effect in the ovary of the blowfly Phormia regina. Our in vitro experiments first showed that extracellular calcium does not play a role during the stimulation of steroidogenesis in fly ovaries; i...
متن کاملRegulation of Apoptosis and Steroidogenesis in Ovarian Preovulatory Granulosa Cells
Only a minute fraction of ovarian follicles present in a foetal ovary will complete the path to ovulation. The majority of the follicles will instead undergo atresia, a hormonally controlled apoptotic process. Apoptosis occurs throughout follicle development, with an extensive reduction in the number of follicles present at birth. Interestingly, this drastic reduction is not present among preov...
متن کاملModulation of steroidogenesis in human ovarian granulosa cells during aging.
OBJECTIVE To investigate the in vitro effect of endothelin-1 (ET-1) on the steroid production (progesterone [P] and estradiol [E2]) by cultured human granulosa cells (GCs) during aging. MATERIAL AND METHODS Human ovarian GCs and granulosa-luteal cells (GLCs) were isolated from ovaries of female patients (young and premenopausal) undergoing surgery for non-ovarian benign gynecological conditio...
متن کاملInhibition of ovarian steroidogenesis by cyclic GMP in a fly.
Previous investigations in the female blowfly Phormia regina have shown that 3-isobutyl-1-methylxanthine (IBMX), a broad spectrum inhibitor of phosphodiesterases (PDEs), fails to mimic the steroidogenic effects of cAMP on ovaries, although it efficiently increases the concentrations of this second messenger. In this study, experiments carried out to clear up this contradiction demonstrated that...
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In the menstrual cycle, the mid-cycle surge of gonadotropins (both luteinising hormone [LH] and follicle-stimulating hormone [FSH]) signals the initiation of the periovulatory interval, during which the follicle augments progesterone production and begins to luteinise, ultimately leading to the rupture of the follicle wall and the release of an oocyte. The administration of gonadotropins in con...
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ژورنال
عنوان ژورنال: Biology of Reproduction
سال: 1979
ISSN: 0006-3363,1529-7268
DOI: 10.1095/biolreprod20.2.226