title: Estrogen (EB) and EB + progesterone (P) induced changes in pituitary sodium, potassium adenosine triphosphatase activity (ATPase).
abstract: Estradiol-benzoate (EB) injected into previously ovariectomized (OVX) rats, increased pituitary ATPase activity 69% over controls, within one hour of treatment. Twelve hours after injection, ATPase activity was not significantly different from controls. Progesterone [(P): 5mg/100gBW] administered in conjunction with EB elicited an analogous response. AT at time of EB and EB+P induced increments in pituitary ATPase activity, plasma LH levels were dramatically reduced to normal, intact diestrous control levels. Post-castrational elevations in FSH were also suppressed after one hour of treatment with EB, but not following EB+P administration. The results suggest that the inhibitory actions of EB and EB+P on post-castrational LH levels may be related to modulation by these steroids of pituitary membrane ATPase activity.
mesh_terms: D000251:Adenosine Triphosphatases / Q000378:metabolism*; D000818:Animals; D002369:Castration; D004789:Enzyme Activation / Q000187:drug effects; D004958:Estradiol / Q000494:pharmacology*; D005260:Female; D005640:Follicle Stimulating Hormone / Q000097:blood; D007986:Luteinizing Hormone / Q000097:blood; D010902:Pituitary Gland / Q000187:drug effects / Q000201:enzymology*; D011188:Potassium / Q000494:pharmacology; D011374:Progesterone / Q000494:pharmacology*; D051381:Rats; D012964:Sodium / Q000494:pharmacology
chemical_list: D011374:Progesterone; D004958:Estradiol; D007986:Luteinizing Hormone; D005640:Follicle Stimulating Hormone; D012964:Sodium; D000251:Adenosine Triphosphatases; D011188:Potassium