نتایج جستجو برای: lh و fsh
تعداد نتایج: 780422 فیلتر نتایج به سال:
The aim of this study was to determine whether the decline in oestradiol inhibition of circulating luteinizing hormone (LH) and follicle-stimulating hormone (FSH) during the peripubertal period of heifers is associated with a change in opioid modulation of LH and FSH secretion. Opioid inhibition of LH secretion was determined by response to administration of the opioid antagonist naloxone. Prep...
Our working hypothesis was that synthesis and release of LH, but not FSH, were solely dependent on LHRH. Twenty ovariectomized (OVX) ewes were randomly assigned to one of five treatments (n = 4 per group). Ewes were administered a low (10 micrograms/kg) or high (100 micrograms/kg) dose of LHRH antagonist (LHRH-Ant) at 24-h intervals for 3 or 6 days. Control ewes received vehicle (5% mannitol) a...
چکیده مقدمه:را لوکسیفن به عنوان یک تنظیم کننده غیر استروئیدی انتخابی گیرنده استروژن می باشد، که دارای اثرات شبه استروژنی است. هدف: هدف از این تحقیق بررسی اثر تجویز داخل صفاقی دوزهای مختلف رالوکسیفن بر مقدار هورمون های lh، fsh، استروژن و پروژسترون در موش های صحرایی ماده بالغ بوده است. مواد و روش ها: 40 سر موش صحرایی ماده از نژاد ویستار با وزن 20±180 گرم و سن 120-100 روزه انتخاب و به گروه های کنت...
Sequential samples of blood were drawn vi~ jugular catheters every 15 min for 24 h from four mares in each of five reproductive states: 1) intact anestrous mares in winter, 2) intact diestrous mares in summer, 3) intact estrous mares in summer, 4) ovariectomized mares in winter and 5) ovariectomized mares in summer. Estrous mares were sampled on d 4 or 5 of estrus and diestrous mares on d 10 or...
Testosterone, LH, FSH, PRL, and sex hormone binding globulin (SHBG) were measured in 72 male epileptic patients on chronic anticonvulsant drug regimes. Sexual activity was estimated and plasma anticonvulsants measured. Total testosterone (TT), LH, FSH, PRL, and SHBG were increased; free testosterone (FT) was decreased. Sexual activity appeared diminished particularly in relation to reduced FT.
Spermatogenesis is regulated by the 2 pituitary gonadotropins, luteinizing hormone (LH) and follicle-stimulating hormone (FSH). This process is considered impossible without the absolute requirement of LH-stimulated testicular testosterone (T) production. The role of FSH remains unclear because men and mice with inactivating FSH receptor (FSHR) mutations are fertile. We revisited the role of FS...
FSH and luteinizing hormone (LH) are secreted constitutively or in pulses, respectively, from pituitary gonadotropes in many vertebrates, and regulate ovarian function. The molecular basis for this evolutionarily conserved gonadotropin-specific secretion pattern is not understood. Here, we show that the carboxyterminal heptapeptide in LH is a gonadotropin-sorting determinant in vivo that direct...
Background: Azoospermia is the total absence of sperm cells from a patients semen sample after centrifugation. It could be obstructive or non-obstructive and its associated causes include chromosomal defects, infections, gonadotrophins imbalance, and etc in the patients. The objective is to determine the prevalence of primary testicular failure, germinal insufficiency, obstructive azoospermia a...
BACKGROUND The role of exogenous LH supplementation in ovarian stimulation is a matter of debate. Here we evaluate the impact of exogenous LH on oocyte yield and developmental competence in an oocyte donation programme. METHODS Oocyte donors were randomized (computer-generated randomization list) to groups stimulated with FSH alone or with a combination of FSH and LH after pituitary down-regu...
BACKGROUND In women with polycystic ovary syndrome (PCOS), despite a high prevalence of insulin resistance, hyperandrogenemia, and disturbances in the secretion of gonadotrophin, the principal causes of biochemical abnormalities and the best endocrine markers for PCOS have not been fully identified. SUBJECTS AND METHODS Serum levels of insulin, glucose, follicle-stimulating hormone (FSH), lut...
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