title: The relation between plasma androstenedione and oestrone levels in untreated and corticosteroid-treated post-menopausal women.
abstract: Plasma oestrone (E1) and androstenedione (A) were measured in 96 untreated and 18 corticosteroid-treated post-menopausal women. Levels of both hormones were consistently lower in the steroid-treated cases, presumably due to suppression of ACTH secretion. There was a clear relationship between A and E1 levels in both groups and when the data were pooled they formed a continuous series with a curvilinear relationship going through the origin. This relationship could be described by an equation based on Michaelis-Menten kinetics, suggesting that the rate of A to E1 conversion is an inverse function of the plasma androstenedione level. The main determinant of plasma E1 was plasma A; body weight and age were of subsidiary importance. Secondary oestrogen deficiency may be a factor in the genesis of steroid-induced osteoporosis in post-menopausal women and oestrogen therapy may be indicated in this group of patients.
mesh_terms: D000305:Adrenal Cortex Hormones / Q000627:therapeutic use*; D000328:Adult; D000368:Aged; D000735:Androstenedione / Q000097:blood*; D002369:Castration; D004970:Estrone / Q000097:blood*; D005260:Female; D006801:Humans; D008593:Menopause / Q000187:drug effects*; D008875:Middle Aged; D011239:Prednisolone / Q000627:therapeutic use; D011241:Prednisone / Q000627:therapeutic use
chemical_list: D000305:Adrenal Cortex Hormones; D004970:Estrone; D000735:Androstenedione; D011239:Prednisolone; D011241:Prednisone