Effect of dexamethasone on the release of pituitary hormones in monolayer cultures of rat pituitary cells.
The effect of dexamethasone on the release of ACTH, GH, PRL, LH and TSH was studied in monolayer cultures of rat pituitary cells in 4-hour incubation. With or without the addition of rat hypothalamic extract, the release of GH was significantly inhibited by dexamethasone at concentrations higher than 10(-9) M, although less remarkably than that of ACTH. Intracellular ACTH and GH were unchanged. PRL, LH and TSH were not affected. These results indicate that dexamethasone, when exerted for 4 hours, suppressed the release of GH as well as ACTH, at least in part, at the pituitary level.
Nakagawa
K
K
Obara
T
T
Matsubara
M
M
Kubo
M
M
D000324:Adrenocorticotropic Hormone / Q000378:metabolism; D000818:Animals; D002478:Cells, Cultured; D003907:Dexamethasone / Q000494:pharmacology*; D013006:Growth Hormone / Q000378:metabolism; D007986:Luteinizing Hormone / Q000378:metabolism; D010902:Pituitary Gland / Q000187:drug effects*; D010907:Pituitary Hormones / Q000378:metabolism*; D011388:Prolactin / Q000378:metabolism; D051381:Rats; D012636:Secretory Rate / Q000187:drug effects; D013972:Thyrotropin / Q000378:metabolism
D010907:Pituitary Hormones; D003907:Dexamethasone; D000324:Adrenocorticotropic Hormone; D011388:Prolactin; D007986:Luteinizing Hormone; D013972:Thyrotropin; D013006:Growth Hormone