title: Guanosine 3':5'cyclic monophosphate and activators of guanylate cyclase inhibit secretagogue-induced corticotropin release by rat anterior pituitary cells.
abstract: The secretion of corticotropin by perfused rat anterior pituitary cell columns was studied. Forty-one residue corticotropin releasing factor, vasopressin and high extracellular KC1 all stimulated the secretion of corticotropin. The hormonal response to corticotropin-releasing factor (10(-10) mol/l), vasopressin (10(-9) mol/l) as well as KC1 (48 mmol/l) was reduced by membrane permeant analogs of cGMP, such as 8-BrcGMP and dibutyryl-cGMP. The 8-BrcGMP analog (10(-5) mol/l) inhibited corticotropin release in response to corticotropin-releasing factor by 30%, that to vasopressin by 70%, and that to KCl by 50%. Atriopeptin1-28 (10(-8) and 10(-7) mol/l), a peptide known to activate membrane-bound guanylate cyclase in the anterior pituitary gland, decreased the release of corticotropin induced by vasopressin to about 30% of control. Similarly, activators of soluble guanylate cyclase, such as glyceryltrinitrate and sodium nitroprusside (10(-5) mol/l) inhibited vasopressin-stimulated corticotropin release by 60%. In conclusion, the data show that purported activators of particulate and soluble guanylate cyclase, as well as derivatives of cGMP itself are strong inhibitors of secretagogue-induced corticotropin release by corticotroph cells of the anterior pituitary gland.
authors.affiliation: Department of Human Anatomy, University of Oxford, England.
authors.forename: F A
authors.initials: FA
authors.lastname: Antoni
authors.forename: G
authors.initials: G
authors.lastname: Dayanithi
mesh_terms: D000324:Adrenocorticotropic Hormone / Q000378:metabolism*; D000818:Animals; D009320:Atrial Natriuretic Factor / Q000494:pharmacology; D003346:Corticotropin-Releasing Hormone / Q000494:pharmacology; D006152:Cyclic GMP / Q000031:analogs & derivatives / Q000494:pharmacology*; D003995:Dibutyryl Cyclic GMP / Q000494:pharmacology; D004789:Enzyme Activation / Q000187:drug effects; D005260:Female; D006162:Guanylate Cyclase / Q000378:metabolism*; D005996:Nitroglycerin / Q000494:pharmacology; D009599:Nitroprusside / Q000494:pharmacology; D010903:Pituitary Gland, Anterior / Q000187:drug effects / Q000378:metabolism*; D011189:Potassium Chloride / Q000494:pharmacology; D051381:Rats; D011919:Rats, Inbred Strains; D014667:Vasopressins / Q000494:pharmacology
chemical_list: D014667:Vasopressins; D009599:Nitroprusside; C016276:8-bromocyclic GMP; D003995:Dibutyryl Cyclic GMP; D011189:Potassium Chloride; D009320:Atrial Natriuretic Factor; D000324:Adrenocorticotropic Hormone; D003346:Corticotropin-Releasing Hormone; D006162:Guanylate Cyclase; D005996:Nitroglycerin; D006152:Cyclic GMP