BACKGROUND The most common genetic variant of luteinizing hormone (LH), variant-betaLH, has a different bioactivity than the wildtype. Carrying the variant allele was associated with an increased consumption of exogenous gonadotropin to achieve optimal ovarian response for in vitro fertilization procedures (IVF). The aim of this study was to examine if variant-betaLH was also more common in pat...

Objective Royal jelly (RJ) is a complementary diet widely used by traditional healers for the treatment of infertility. The aim of present study was to evaluate the effect of RJ on some reproductive parameters in immature female rats. MaterialsAndMethods In this experimental study, thirty two immature female rats (30-35gr) were divided into four groups (n=8 /group). Control group received 0.5 m...

Background: Melasma is the acquired, gradual and symmetric hyper pigmentation of the face. Melasma has been related to many factors such as pregnancy, genetic, endocrine and sun exposure but the exact relationship to endocrine factors isn’t still clear. Objectives: To evaluate the relationship between melasma and polycystic ovarian disease and androgenic hormones. Patients and Methods: Th...

In female, energy metabolism influences reproductive function by modulating the Hypothalamic Pituitary Ovarian axis including hypothalamic GnRH neuronal network, pituitary gonadotropin secretion and ovarian follicle growth steroidogenesis. Several hormones neuropeptides or metabolites are important signals between balance reproduction. These sensors mediate their action on cells through specifi...

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...

'Steroid hormones are essential for the growth, differentiation and function of many tissues in both animaIs and humans. It has been established by animal experimentation that modification of the hormonal environment by surgical removal of endocrine glands, by pregnancy or by exogenous administration of steroids can increase or decrease the spontaneous occurrence of tumours or the induction of ...

The aim of the present study was to understand the hormonal mechanisms behind the effect of high temperatures on reproductive function. It was proposed that high temperatures can directly alter production of ovarian hormones and/or the response of ovarian cells to hormonal stimulators. To examine this hypothesis, in the 1st series of experiments, we compared the release of progesterone (P4), es...

Juvenile hormones (JHs) are key regulators of insect development and reproduction. The JH biosynthetic pathway is known to involve 13 discrete enzymatic steps. In the present study, we have characterized the JH biosynthetic pathway in the cockroach Diploptera punctata. The effect of exogenous JH precursors on JH biosynthesis was also determined. Based on sequence similarity, orthologs for the g...

Dopamine (DA) is responsive to hormonal manipulations and has been implicated in the regulation of female rat sexual behavior. In the present studies, extracellular DA levels were assessed in the medial preoptic area (MPOA) of ovariectomized female rats in response to exogenous ovarian hormones and during sexual activity. In female rats primed with a low dose of estradiol benzoate (2 microg), b...

The aim of our study was to understand whether ovarian steroid hormones, and their response to the metabolic hormones leptin and IGF-I leptin, could be involved in the control of mink reproductive aging via changes in basal release of ovarian progesterone and estradiol. For this purpose, we compared the release of progesterone and estradiol by ovarian fragments isolated from young (yearlings) a...