In previous studies, the neuroprotective effect of progestrone in diffuse traumatic brain injury has been shown. This study used mifepristone (RU-486), a potent progesterone receptor antagonist, to evaluatethe hypothesis that the neuroprotective effect of progesterone in traumatic brain injury is mediated by the progesterone receptors. The ovariectomized rats were divided into 6 groups. Brain i...

The modulatory effects of gestational age and circulating concentrations of progesterone, 5-pregnane-3,20-dione, and estradiol-17 on the uterine sex steroid hormone receptor levels of the African elephant were investigated. Uterine tissue biopsies and blood samples were obtained from animals culled in the Kruger National Park. Estrogen and progesterone receptor concentrations were determined in...

background: the female breast is subjected to a lifetime of hormonal controls, whose effect is evident at the time of menarche and during the menstrual cycle, pregnancy and lactation. studies have reported multiple risk factors for breast cancer, some of which are a reflection of hormonally mediated events. the steroid receptors are also served as prognostic factors for evaluating status of mal...

BACKGROUND It is well known progesterone can have anxiolytic-like effects in animals in a number of different behavioral testing paradigms. Although progesterone is known to influence physiology and behavior by binding to classical intracellular progestin receptors, progesterone's anxiety reducing effects have solely been attributed to its rapid non-genomic effects at the GABA A receptor. This ...

Background: Implantation is characterized by the interaction of two immunologically and genetically distinct tissues. The embryo differs from the cells of the mother, and would be rejected as a parasite by the immune system of the mother if it didn’t secrete immunosuppressive agents. Thus, immunological rejection of the fetus due to recognition of paternal antigens by the maternal immune system...

the brain edema is one of remarkable injuries after traumatic brain injuries (tbi). the common treatments for limiting edema are included mannitol, barbiturates, corticosteroids, hyperventilation and central nervous system derange. the most of these treatments for edema is problematic. for example, mannitol can be effective for the short period of time (24 hours) after brain injuries but is not...

Progesterone is a key developmental, proliferative, and differentiative hormone in the breast and endometrium, and it can accelerate carcinogenesis in the mammary gland epithelium. In the breast and uterus, progesterone acts through two coexpressed isoforms of progesterone receptors, the B- and A-receptors. To study the function of each isoform in isolation, we previously constructed two breast...

Background: The female breast is subjected to a lifetime of hormonal controls, whose effect is evident at the time of menarche and during the menstrual cycle, pregnancy and lactation. Studies have reported multiple risk factors for breast cancer, some of which are a reflection of hormonally mediated events. The steroid receptors are also served as prognostic factors for evaluating status of mal...