نتایج جستجو برای: sex steroid
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Alkaloids in tobacco and cigarette smoke causes malfunction of the endocrine system. Under certain conditions, smoking may be a risk factor for the development of hormone dependent pathology. Researching the relationship between smoking and sex steroid hormone status was based on the investigation of serum androgens and estrogens in men, smokers and nonsmokers. Comparative determinations were m...
Steroid sex hormones play a central role in breast carcinogenesis. Evidence from in vitro and animal studies suggests that phytoestrogens may inhibit the development of mammary tumors through their role in regulating the synthesis, metabolism, and signal transduction of steroid hormones. In a study of 117 case-control pairs of postmenopausal women in Shanghai, we investigated whether the associ...
To investigate the role of steroid receptors in mediating the reported effects of steroids on Schwann cell (SC) myelination and growth, we determined mRNA contents and transcriptional activities of the corticosteroid (glucocorticosteroid and mineralocorticosteroid) receptors (GR and MR) and sex steroid (progesterone, androgen, and estrogen alpha and beta) receptors in rat SC cultured under prol...
background: snow trout (schizothorax pelzami) is an economically important species endemic in the north east of iran. objectives: the purpose of the present study was to investigate the reproduction cycle, time and temperature range of spawning. methods: the biometry of 243 fishes was measured and the ovarian development stages and plasma sex steroid hormones (testosterone, 17b- estradiol, pro...
We estimated concentrations of fecal reproductive steroid metabolites in freeranging California Spotted Owls (Strix occidentalis occidentalis) during the breeding season. We collected fresh fecal samples (n 5 142) from 65 individual owls in the Sierra Nevada during April–August of 2001. We developed and validated radioimmunoassay procedures to quantify fecal estrogen metabolites and fecal testo...
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