title: Failure of 1, 25 dihydroxycholecalciferol (1, 25-(OH) 2-D3) to modify cyclic AMP levels in parathyroid hormone-treated and untreated bone cells.
abstract: Treatment with 1, 25-(OH) 2-D3 (1 ng/ml-25 ng/ml) for periods ranging from 2.5 min. to 60 min. did not alter cyclic AMP levels in bone cells isolated from periosteum-free rat calvaria, or in cells isolated from rat periosteal tissues. 1, 25-(OH) 2-D3 failed to modify the acute increases in cyclic AMP elicited by PTH (10 ng/ml-1 ug/ml). Two separate 1, 25-(OH) 2-D3 preparations, biologically active in other systems, were ineffective under a wide variety of experimental conditions. These results suggest that 1, 25-(OH) 2-D3 is not an acute modulator of cyclic AMP metabolism in PTH-treated and untreated bone cells.
mesh_terms: D000818:Animals; D001842:Bone and Bones / Q000187:drug effects / Q000378:metabolism*; D002478:Cells, Cultured; D000242:Cyclic AMP / Q000378:metabolism*; D004100:Dihydroxycholecalciferols / Q000494:pharmacology*; D005260:Female; D005333:Fetus; D006887:Hydroxycholecalciferols / Q000494:pharmacology*; D010281:Parathyroid Hormone / Q000494:pharmacology*; D011247:Pregnancy; D051381:Rats; D013806:Theophylline / Q000494:pharmacology
chemical_list: D004100:Dihydroxycholecalciferols; D006887:Hydroxycholecalciferols; D010281:Parathyroid Hormone; D013806:Theophylline; D000242:Cyclic AMP