title: Differential biological effects of calcitonin and parathyroid hormone on isolated perfused bone.
abstract: These studies examine the release of 3',5'-cyclic adenosine monophosphate (cyclic AMP) from isolated perfused canine bones in response to synthetic bovine parathyroid hormone (syn b-PTH 1-34) and human calcitonin (hCT). Bones for perfusion were obtained from three groups of dogs: control (n = 11); thyroparathyroidectomized (n = 7), and mithramycin-treated thyroparathyroidectomized animals (n = 5). The results indicate that PTH causes a greater release of cyclic AMP from adult bones than CT; the addition of the two hormones simultaneously results in a synergistic rather than an additive effect; mithramycin inhibits the cyclic AMP response to calcitonin; and thyroparathyroidectomy decreases the cyclic AMP release in response to CT stimulation, suggesting that the cells (osteoclast-like) that respond to CT have an impaired response in the absence of PTH; acute TPTX does not affect the response of the cell populations of adult bones to PTH.
mesh_terms: D000818:Animals; D001842:Bone and Bones / Q000187:drug effects* / Q000378:metabolism; D002116:Calcitonin / Q000494:pharmacology*; D000242:Cyclic AMP / Q000378:metabolism; D004285:Dogs; D005260:Female; D066298:In Vitro Techniques; D008297:Male; D010280:Parathyroid Glands / Q000502:physiology; D010281:Parathyroid Hormone / Q000378:metabolism / Q000494:pharmacology*; D010446:Peptide Fragments / Q000378:metabolism / Q000494:pharmacology*; D008926:Plicamycin / Q000494:pharmacology; D013965:Thyroidectomy
chemical_list: D010281:Parathyroid Hormone; D010446:Peptide Fragments; C025076:parathyroid hormone (1-34), bovine; D002116:Calcitonin; D000242:Cyclic AMP; D008926:Plicamycin