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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...
Although many aspects of cardiovascular disease are similar between women and men, it is becoming increasingly obvious that there are significant differences as well. Premenopausal women ususally have a lower risk of cardiovascular diseases than age-matched men and postmenopausal women. However, the “female advantage” disappears once women are affilicted with diabetes mellitus. Heart diseases are...
Lymphocytic hypophysitis (LH) is an inflammatory disease of the anterior pituitary. The varying clinical presentation and the short-term outcome of LH have been extensively described in several case reports or small cohort studies. However, little is known about the long-term outcome of this disease. It is currently believed that if left untreated it may run a self-limited course followed by full...
A total of 95 patients with Graves’ disease (GD) and 105 normal healthy controls were enrolled in this study to determine how a single site polymorphism of the transporter associated with antigen processing 1 (TAP1) gene contributes to the pathogenesis of GD. The polymorphism was detected using polymerase chain reaction (PCR)-based restriction analysis. Associations between GD and the two-site polymorphisms...
Diabetes with hypertension is characterized by increased cerebrovascular pathology and poorer outcomes following stroke. In this study we evaluated the effect of global brain ischemia on brain metabolic parameters in normal and diabetic rats treated with a dihydropyridine calcium antagonist, felodipine. Normal and diabetic rats were treated daily with felodipine (5 mg/kg) or saline. After 4 wk global...
Components of the adipose renin-angiotensin system (RAS) have been suggested as providing a potential pathway linking obesity to hypertension. In adipose cells, the biological responses to β-adrenergic stimulation are mediated by an increase in intracellular cAMP. Because an association exists among body fat mass, hypertension, and increased sympathetic stimulation, we examined the influence of cAMP...
Normotensive female rats exhibit age-related decreases in estrous cyclicity and increases in blood pressure. In spontaneously hypertensive rats, estrogens, including dietary phytoestrogens, prevent or attenuate the increased blood pressure associated with estrogen depletion. The present studies examine the effects of ovariectomy (OVX) at either 3 or 10 mo of age. Although blood pressure increases...
Estrogen replacement therapy (ERT) is one of the most challenging issues women and their physicians have to face. Clinical and epidemiological studies have provided conflicting data regarding the cardiovascular benefit versus risk in women using ERT. Although ERT may improve several risk factors of coronary heart disease such as favorable changes in lipid profile, an associated increased incidence...
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