title: Inhibitory effect of dibutyryl cyclic AMP on the release of calcium, inorganic phosphate and lysosomal enzymes from calvarial bones cultured for 24 hours.
abstract: The effect of N6,O2'-dibutyryl adenosine 3',5'-cyclic-monophosphate (dbcAMP) on the mobilization of calcium (Ca2+), inorganic phosphate (Pi) and lysosomal enzymes was studied in a bone culture system for 24 h using half calvaria from 6--7 day-old mice. DbcAMP inhibited spontaneous as well as parathyroid hormone-stimulated mineral mobilization. DbcAMP in a concentration of 5 x 10(-4)M also reduced the activities of beta-glucuronidase, beta-galactosidase and acid phosphatase found in the media while the activities of lactate dehydrogenase, aspartate aminotransferase and alanine aminotransferase were not affected. It is concluded that cAMP is not a stimulator but an inhibitor of bone resorption within the culture period studied (24 h) and that the cyclic nucleotide might interfere with release processes involved in bone resorption.
mesh_terms: D000135:Acid Phosphatase / Q000378:metabolism; D000410:Alanine Transaminase / Q000378:metabolism; D000818:Animals; D001219:Aspartate Aminotransferases / Q000378:metabolism; D001842:Bone and Bones / Q000201:enzymology / Q000378:metabolism*; D003994:Bucladesine / Q000494:pharmacology*; D002118:Calcium / Q000378:metabolism*; D002478:Cells, Cultured; D005947:Glucose / Q000378:metabolism; D005966:Glucuronidase / Q000378:metabolism; D007770:L-Lactate Dehydrogenase / Q000378:metabolism; D008247:Lysosomes / Q000201:enzymology*; D051379:Mice; D010281:Parathyroid Hormone / Q000494:pharmacology; D010710:Phosphates / Q000378:metabolism*; D001616:beta-Galactosidase / Q000378:metabolism
chemical_list: D010281:Parathyroid Hormone; D010710:Phosphates; D003994:Bucladesine; D007770:L-Lactate Dehydrogenase; D001219:Aspartate Aminotransferases; D000410:Alanine Transaminase; D000135:Acid Phosphatase; D001616:beta-Galactosidase; D005966:Glucuronidase; D005947:Glucose; D002118:Calcium