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The progesterone positive feedback effect in women after ovariectomy
(2013)
Various ovarian substances regulate the secretion of gonadotrophins during the menstrual cycle, but there are still several unclarified issues. The aim of this study was to investigate the positive feedback effect of ...
Evidence that termination of the estradiol-induced luteinizing hormone surge in women is regulated by ovarian factors
(2006)
Background: The endogenous LH surge is the result of the estrogen-positive feedback effect. However, the factors that are responsible for the termination of LH surge are not known. Objective: The objective of the study was ...
From menarche to regular menstruation - Endocrinological background
(2006)
Marked changes in hormone secretion occur from childhood to adulthood. Prior to puberty gonadotropin-releasing hormone (GnRH) secretion is markedly suppressed. At the onset of puberty, the hypothalamic gonadostat is ...
Attenuating activity of the ovary on LH response to GnRH during the follicular phase of the cycle
(2014)
Objective Oestradiol sensitizes the pituitary to GnRH, while gonadotrophin surge attenuating factor (GnSAF) may oppose this action. Using the LH response to GnRH during treatment with FSH as an in vivo bioassay for GnSAF, ...
Attenuation of the oestrogen positive feedback mechanism with the age in postmenopausal women
(2015)
ObjectiveIt has been reported that the positive feedback mechanism of oestrogens and progesterone is preserved, although attenuated, in late postmenopausal years. Whether this is also true for the positive feedback effect ...
FSH and LH responses to GnRH after ovariectomy in postmenopausal women
(2004)
OBJECTIVE Whether the postmenopausal ovary is still playing a role in the control of gonadotrophin secretion in response to GnRH has not been investigated. The aim of the present study was to test this hypothesis by examining ...