Biological activities of 17a-acetoxy-6-chloro-pregna-4,6-diene-3,20-dione (chlormadinone acetate ; CMA) were investigated in comparison with those of 17a-acetoxy-6a-methylpregnane-3,20-dione (medroxyprogesterone acetate ; MAP). CMA produced marked progestational activity either subcutaneously or orally in the uterine carbonic anhydrase test, and its relative potency is approximately 30 times th...

The yield of Aspergillus niger mycelium from a synthetic medium can be increased by the addition of microgram quantities of cholesterol, ergosterol, cholestanol, 7-dehydrocholesterol, stigmasterol, sitosterol, pregnenolone, and the vitamins D. The stimulation is not due to degradation to the acetate level. It is obtained only in highly aerated cultures. The rate of growth of Torula utilis was n...

BACKGROUND The use of sex steroids in oral contraception or hormonal replacement therapy is associated with an increased risk of cardiovascular thromboembolic complications. Although both the estrogen and the progestin components have been involved, the underlying mechanisms responsible are unclear. METHODS AND RESULTS This study examined whether sex steroids promote hemostasis indirectly by ...

Medroxyprogesterone acetate (MPA) is a synthetic progestin commonly used in hormone replacement therapy (HRT). The aim of this research was to study and compare the effect of progesterone (Pg) and MPA on the regulation of cellular events associated with vascular homeostasis and disease. Platelet adhesion to endothelial cells (ECs), nitric oxide (NO) production, and cell migration were studied u...

Introduction: Lead is one of the toxic heavy metals. This study investigated the antioxidant effect of cinnamon on lead poisoning in reproductive system in order to find a solution for the people exposed to lead. Materials and Methods: Forty-tow Wistar rats were divided into 7 groups of 6 each: one control group which received no treatment, sham group 1 (distilled water with alcohol for 14 days...

The prolactin (PRL) release-inhibitory effects of progesterone, dexamethasone, megestrol acetate, and mifepristone (RU 38486) were studied in cultured pituitary tumor cells prepared from the 7315a and 7315b tumor. Both tumors contain similar numbers of estrogen and progesterone receptors, while only the 731Sa tumor also has glucocorticoid receptors. PRL release by the 731Sa tumor was stimulated...

Uterine fibroids are a common disease in women and lead to different symptoms, like pain and bleeding disorders. Apart from surgical treatment, there are many medical treatment options, which are presented in this article. Combined oral contraceptives and Levonorgestrel-releasing intrauterine systems are possible options for bleeding disorders that are a consequence of uterine fibroids. Gonadot...

STUDY DESIGN: Surgically postmenopausal adult female cynomolgus macaques (Macaca fascicularis) were given either no treatment (n = 26), conjugated equine estrogens (n = 22), or combined therapy with conjugated equine estrogens and medroxyprogesterone acetate (n = 21). Drugs were administered in the diet, at doses equivalent on a caloric basis to 0.625 mg per woman per day for conjugated equine ...

Controversial results obtained from human and animal studies on the prevention of heart disease by estrogens and progestins warrant a better understanding of nuclear hormone receptor function and interaction. To address this issue and taking into account that effects of synthetic progestins are not only referable to action through the progesterone receptor but may also be mediated by other ster...