Πλοήγηση ανά Θέμα "ESTRADIOL"
Αποτελέσματα 1-14 από 14
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Associations of Estrogen Receptor Alpha and Beta Gene Polymorphisms with Sex Steroid Levels and Body Fat Content in Men
(2012)Objective: Estrogens play an important role in male physiology. We investigated the possible association of four single nucleotide polymorphisms in Estrogen Receptor alpha (ESR1) and Estrogen Receptor beta (ESR2) genes ... -
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 ... -
Changes in pituitary sensitivity to GnRH in estrogen-treated post-menopausal women: evidence that gonadotrophin surge attenuating factor plays a physiological role
(2004)BACKGROUND: The purpose of this study was to investigate changes in pituitary response to GnRH in post-menopausal women during substitution treatment with exogenous estrogen and progesterone. METHODS: Seven healthy ... -
Development of GC-MS/MS method with programmable temperature vaporization large volume injection for monitoring of 17 beta-estradiol and 2-methoxyestradiol in plasma
(2012)Monitoring of estradiol and its metabolites in biological samples is essential for the accurate diagnosis of a number of endocrine diseases. In this study, a sensitive, precise and specific GC-MS/MS method for the ... -
Effect of mifepristone (RU486) on the pituitary response to gonadotrophin releasing hormone in women
(1996)Mifepristone interrupts folliculogenesis in women but the mechanism is not clear, Previous studies have investigated the effect of this compound on gonadotrophin secretion and have provided conflicting results. To study ... -
Evidence of differential control of FSH and LH responses to GnRH by ovarian steroids in the luteal phase of the cycle
(2002)BACKGROUND: It is known that during the follicular phase of the cycle, estradiol sensitizes the pituitary to GnRH. The aim of this study was to determine the role of ovarian steroids in the control of GnRH-induced gonadotrophin ... -
Formation of a secondary corpus luteum after ultrasound-guided follicular aspiration in cows
(2000)This paper reports the observed formation of a secondary corpus luteum (CL) in the presence of the cyclic corpus luteum, on the ovaries of a cow after ultrasound-guided follicular aspiration for oocyte recovery. The secondary ... -
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 ... -
Inhibin secretion in women with the polycystic ovary syndrome before and after treatment with progesterone
(2011)Objectives: It has been suggested that inhibin secretion is altered in women with the polycystic ovary syndrome (PCOS). However, the contribution of a preceding luteal phase has not been taken into account. The aim of the ... -
Modulating effect of leptin on basal and follicle stimulating hormone stimulated steroidogenesis in cultured human lutein granulosa cells
(2009)Background: In vitro data have shown conflicting results in terms of the effect of leptin on granulosa cells steroidogenesis. Aim: The aim of the present study was to investigate the effect of low and high doses of leptin ... -
Non-genomic effect of testosterone on airway smooth muscle
(2006)Background and purpose: Recent studies on blood vessels have provided evidence that testosterone may exert direct effects on smooth muscle. However, an acute effect on airway reactivity has not been shown yet. The aim of ... -
Nonlinear binding of sex steroids to albumin and sex hormone binding globulin
(1997)We have studied the binding of sex steroids to albumin and sex hormone binding globulin (SHBG) using gel filtration chromatography for the separation of the bound from the free fraction of the steroid. It was found that ... -
Oestradiol plus progesterone treatment increases serum leptin concentrations in normal women
(2001)BACKGROUND: Previous studies have alluded to a role for both oestradiol and progesterone in the secretion of leptin from fat cells in the human, although direct evidence has yet to be obtained. The study aim was to assess ... -
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 ...