title: The biological properties of bovine parathyroid hormone (1-41), a fragment generated from the native hormone by human leukocytes.
abstract: Native bovine parathyroid hormone (bPTH) was found to be readily cleaved with human leukocyte elastase to yield the fragments bPTH(1-41) and bPTH(42-84). These were then isolated by reverse-phase HPLC and characterised by gas-phase sequencing and amino acid analysis. The biological activities of these fragments were assessed in an adenylate cyclase bioassay using the rat osteosarcoma cell line UMR106. bPTH(1-41) was found to have approximately twice the molar potency of the native hormone from which it was derived. bPTH(42-84) had no biological activity and did not modulate the adenylate cyclase response to these cells to the native hormone. The possible physiological significance of these observations is discussed.
mesh_terms: D000262:Adenylyl Cyclases / Q000378:metabolism; D000818:Animals; D002417:Cattle; D002460:Cell Line; D004789:Enzyme Activation / Q000187:drug effects; D006801:Humans; D066298:In Vitro Techniques; D007962:Leukocytes / Q000378:metabolism; D010196:Pancreatic Elastase / Q000378:metabolism; D010281:Parathyroid Hormone / Q000378:metabolism / Q000494:pharmacology*; D010446:Peptide Fragments / Q000378:metabolism / Q000494:pharmacology*
chemical_list: D010281:Parathyroid Hormone; D010446:Peptide Fragments; C053453:parathyroid hormone (1-41), bovine; D010196:Pancreatic Elastase; D000262:Adenylyl Cyclases