Πλοήγηση ανά Θέμα "LUTEINIZING-HORMONE"
Αποτελέσματα 1-20 από 20
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Association between physical properties of cervical mucus and ovulation rate in superovulated cows
(2011)Possible associations between certain physical properties of cervical mucus (CM) and ovulation rate were studied in 21 superovulated Holstein cows. In CM samples collected at the beginning of estrus (0 h) and in 4 h intervals ... -
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 ... -
Circulating endothelin-3 and prolactin concentrations in healthy lactating women during the early puerperium
(1998)Objective: To study the association between the circulating concentrations of endothelin-3 and prolactin in the early puerperium. Design: Prospective clinical study, including twenty-five healthy puerperal women breast-feeding ... -
Development and application of competitive ELISA assays for rat LH and FSH
(1999)Rat LH (rLH) and FSH (rFSH) were measured by sensitive and specific competition ELISAs. The rat LH ELISA used rLH-I-9 coated plates, an antiserum against rLH and an antibody against rabbit IgG labeled with peroxidase. Using ... -
Failure of the GnRH antagonist ganirelix to block the positive feedback effect of exogenous estrogen in normal women
(2010)This study investigated whether the GnRH antagonist ganirelix is able to block the positive-feedback effect of E-2 in normal women. Ganirelix was unable to block the positive-feedback effect, suggesting that the clinical ... -
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 ... -
FSH modulatory effect on human granulosa cells: a gene-protein candidate for gonadotrophin surge-attenuating factor
(2011)Previous evidence indicates a homology of gonadotrophin surge-attenuating factor (GnSAF) to the carboxyl terminal of human serum albumin (HSA) and the ability of human granulosa cells to produce mRNA transcripts corresponding ... -
Ghrelin: New Insights into Female Reproductive System-Associated Disorders and Pregnancy
(2012)Ghrelin is considered the endogenous ligand of growth hormone secretagogue receptor type 1a, and its modulatory actions have been demonstrated in a large array of endocrine and nonendocrine functions. According to recent ... -
Human ghrelin decreases pituitary response to GnRH in superovulated ewes
(2013)In addition to its metabolic role, ghrelin has been found to suppress luteinizing hormone secretion in many species acting mainly at the hypothalamic level. The objectives of the present study were to test the hypothesis ... -
In a flexible antagonist protocol, earlier, criteria-based initiation of GnRH antagonist is associated with increased pregnancy rates in IVF
(2005)BACKGROUND: The purpose of the study was to assess ongoing pregnancy rates across groups of patients treated by IVF, which were defined according to criteria aimed at the prevention of premature LH surge and used for ... -
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 ... -
Initiation of GnRH antagonist on Day 1 of stimulation as compared to the long agonist protocol in PCOS patients. A randomized controlled trial: effect on hormonal levels and follicular development
(2007)BACKGROUND: The optimal time for GnRH antagonist initiation is still debatable. The purpose of the current randomized controlled trial is to provide endocrine and follicular data during ovarian stimulation for IVF in ... -
Luteal stage dependence of pituitary response to gonadotrophin-releasing hormone in cyclic dairy ewes subjected to synchronisation of ovulation
(2005)Possible hormonal aberrations precluding conception or maintenance of pregnancy in dairy ewes subjected to ovulation synchronisation were investigated in this study. The pituitary response to exogenous gonadotrophin-releasing ... -
Novel aspects of the endocrinology of the menstrual cycle
(2014)Ovarian control of gonadotrophin secretion is normally achieved via the feedback mechanisms mediated by oestradiol and progesterone. Evidence has been provided that nonsteroidal substances, such as inhibin A and B, participate ... -
Polycystic ovaries and obesity
(2015)Almost 50% of the women with polycystic ovary syndrome (PCOS) are obese. Obesity in PCOS affects reproduction via various mechanisms. Hyperandrogenism, increased luteinizing hormone (LH) and insulin resistance play a pivotal ... -
Polymorphisms of the insulin receptor and the insulin receptor substrates genes in polycystic ovary syndrome: A Mendelian randomization meta-analysis
(2010)Polycystic ovary syndrome (PCOS) is a heterogeneous condition with unknown aetiology which is considered to be the most common endocrine disorder in women of reproductive age. In this work we investigated the association ... -
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 ... -
The recombinant subdomain IIIB of human serum albumin displays activity of gonadotrophin surge-attenuating factor
(2004)BACKGROUND: Gonadotrophin surge-attenuating factor (GnSAF) is an as yet unidentified ovarian factor that acts on the pituitary to attenuate the pre-ovulatory LH surge. In a previous study, GnSAF bioactivity was proposed ... -
Reproductive efficiency of three estrus synchronization schemes comprising fixed-time insemination in dairy cows
(2000)The objective of this field trial was to compare the odds of pregnancy at 25 days (P25) and at 60 days (P60), of embryonic death (ED) between 25 and 60 days, and of non-pregnant cows returning to heat 20-25 days after ...