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Follicle-stimulating hormone receptor (FSHR) and luteinizing hormone receptor (LHR) belong to the super-family of G protein-coupled receptors (GPCR); GPCRs are negatively regulated by RGS ("regulators of G protein signaling") proteins. In this study we evaluated the effects of RGS3 and RGS10 on FSHR and LHR ligand binding and effector coupling. FSHR and LHR ligand binding were unchanged...
C2C12 myoblasts expressing the androgen receptor (AR) were used to analyze the role of androgen-AR signaling pathway in skeletal muscle development. Marked up-regulation of AR expression was observed in differentiated myotubes. A nuclear run-on transcription assay demonstrated that transcription of the AR gene is increased during skeletal muscle cell differentiation. Regulation of skeletal muscle-specific...
Objective: To assess the effectiveness of radioactive iodine (RAI) treatment in patients with hyperthyroidism and to evaluate prognostic factors affecting outcome. Research Design and Methods: Our cohort comprised 115 consecutive patients with hyperthyroidism treated with RAI at the Endocrinology Clinic at the Farabi Hospital, Trabzon, between 1994 and 2002. Data were retrieved from the endocrinology...
To assess the effect of social isolation of growing rats on 24-h rhythmicity of circulating prolactin and growth hormone (GH) levels and submaxillary lymph node immune responses, male Wistar rats were either individually caged or kept in groups (4–5 animals per cage) for 30 d starting on d 35 of life. Plasma prolactin and GH levels, and submaxillary lymph node lymphocyte subset populations, interferon...
Aging induces changes in several organs, such as the liver, and this process might be due to damage caused by free radicals and inflammatory mediators. The growth hormone (GH)/insulin-like growth factor-1 (IGF-1) axis shows a reduction with age, and this fact could be associated with some age-related changes. The aim of this study was to investigate the effect of GH administration on age-induced alterations...
Rhythmic insulin secretion from pancreatic islets is the culmination of many processes both intrinsic and extrinsic to the beta cell. We wished to examine and compare endogenous metabolic oscillations in islets and isolated single beta cells that underlie secretion. Fluorescence patterns of rhodamine 123, an indicator of mitochondrial membrane potential (ΔΩm), were analyzed for period and amplitude...
The present study was planned to explain the relation between erythrocyte osmotic fragility and oxidative stress and antioxidant statue in primary hypothyroid-induced experimental rats. Twenty-four Spraque Dawley type female rats were divided into two, as control (n=12) and experimental (n=12), groups weighing between 160 and 200 g. The experimental group animals have received tap water methimazole...
The relationship among plasma levels of immunoreactive (ir)-inhibin, inhibin A, inhibin pro-αC, FSH, estradiol-17β and follicular growth were investigated during the normal estrous cycle in mares. Seven mares were used for two successive normal estrous cycles. Follicular diameters and ovulation were obtained by transrectal ultrasonography, and blood samples were collected daily by jugular venipuncture...
d-glucose was previously reported to cause a concentration-related decrease in the 36Cl− content of prelabeled islets prepared from ob/ob mice, a current animal model of inherited obesity. From these findings, it was inferred that the hexose stimulates Cl− efflux from islet cells and that such an increase in Cl− permeability may partly mediate glucose-induced depolarization of insulin-producing cells...
Sex steroids modify sexual behavior and autonomic function. The gradual decline in circulating levels is correlated with several diseases in humans and animals. However, little is known about age-related changes that occur in the availability of these steroids. In the current studies, we characterized age-related changes in (1) circulating levels of estradiol (females) or testosterone (males), (2)...
Although favorable effects of estrogen replacement therapy on atherosclerosis have been recognized, the benefit versus risk of estrogen replacement on overall cardiovascular health remains controversial. The main adverse effect jeopardizing the clinical usage of estrogen is the increased risk of breast and endometrial cancer. Zearalenone (ZEN) is a universal endogenous hormone possessing estrogen-like...
The present study investigates the effects of functional sensorial denervation, induced by administering capsaicin to hemiovariectomized adult female rats in each day of the estrus cycle, on ovulation and serum concentrations of estrogen and progesterone. The results indicate that the establishment of compensatory ovarian hypertrophy (COH) and compensatory ovulation (CO) depends on both the day of...
Many studies have established that dopamine (DA) secreted by tuberoinfundibular dopaminergic (TIDA) neurons in the hypothalamus is the major inhibitory factor controlling prolactin (PRL) secretion from the anterior pituitary. Endogenous opioid peptides (EOPs), mainly the neuropeptide β-endorphin, facilitate PRL secretion by decreasing TIDA neuronal inhibitory tone in a number of physiological conditions,...
+49 A/G polymorphism of CTLA-4 gene has been suggested to be associated with type 1 diabetes in some populations. However, a functional significance of the +49 A/G polymorphism is unknown, because it is believed the polymorphism does not affect the function of the CTLA-4 molecule. In this study, we examined the +49 A/G polymorphism of the CTLA-4 gene in 30 Japanese type 1 diabetic patients (14 type...
Papillary thyroid carcinoma (PTC) is the most common type of well-differentiated thyroid carcinoma and typically has an excellent prognosis. The incidence of distant metastasis from PTC is low. However, once metastasis has developed in a distant site, prognosis is markedly diminished. Brain metastases from PTC are extremely rare. No consensus regarding management has yet been reached. We report on...
Thyrotropin (TSH)-secreting pituitary adenomas are the less frequent form of presentation of pituitary tumors. The presence of somatostatin receptors on TSH-secreting adenomas allows treatment of central hyperthyroidism with somatostating analogs. We report a 21-yr-old woman with TSH-secreting pituitary macroadenoma, who was diagnosed based on the symptoms of hyperthyroidism, the lack of inhibition...
Src tyrosine kinase belongs to a non-receptor tyrosine kinase family and has been shown to be involved in G protein-coupled receptor desensitization and internalization. Stimulation of ovarian thecal cells with luteinizing hormone (LH) activates adenylyl cyclase via a G protein-coupled LH receptor leading to an increase in cAMP. Subsequently, cAMP activates protein kinase A (PKA) that increases steroidogenesis...
It has been proposed that a global decline in sperm counts, semen quality, and several male reproductive disorders are associated with exposure to environmental chemicals. Thus, the present study examined the effects of two estrogenic chemicals, octylphenol (OP) and bisphenol A (BPA), on epididymal sperm counts and sperm motility, luteinizing hormone (LH)-releasing hormone (LHRH)-stimulated plasma...
Asp578Gly is the major mutation of luteinizing hormone (LH) receptors in humans. It is a dominant mutant, constitutively activates Gαs, and induces cAMP production in the absence of the cognate hormone, causing the familial male precocious puberty. The mechanism of the elevated basal cAMP level is unclear. Our data show strikingly different mechanisms between the elevated basal cAMP induced by the...
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