title: Parathyroid hormone (PTH)-related protein, PTH, and 1,25-dihydroxyvitamin D in dogs with cancer-associated hypercalcemia.
abstract: Circulating N-terminal PTH-related protein (PTHrP), N-terminal PTH, and 1,25-dihydroxyvitamin D [1,25-(OH)2D] concentrations were measured in normal dogs and dogs with cancer-associated hypercalcemia (CAH), parathyroid adenomas, and miscellaneous tumors. PTHrP was undetectable (less than 1.8 pM) in normal dogs and increased in dogs with CAH due to adenocarcinomas derived from apocrine glands of the anal sac (44.9 +/- 27 pM), lymphoma (8.3 +/- 4.4 pM), and miscellaneous carcinomas (13.3 +/- 11.4 pM). The PTHrP concentration decreased in dogs with lymphoma and anal sac adenocarcinomas after successful treatment of CAH. The PTHrP concentration had a significant linear correlation with total serum calcium in dogs with anal sac adenocarcinomas and hypercalcemia, but not in dogs with lymphoma and hypercalcemia. Serum N-terminal PTH concentrations were usually in the normal range (12-34 pg/ml) for all groups of dogs except dogs with parathyroid adenomas (83 +/- 38 pg/ml). The serum PTH concentration increased after successful treatment of CAH. Serum 1,25-(OH)2D concentrations were decreased, normal, or increased in dogs with CAH, and 1,25-(OH)2D levels decreased after treatment of CAH. In summary, circulating concentrations of PTHrP are consistently increased in dogs with CAH, and PTHrP appears to play an important role in the induction of hypercalcemia.
authors.affiliation: Department of Veterinary Pathobiology, Ohio State University College of Veterinary Medicine, Columbus 43210.
authors.forename: T J
authors.initials: TJ
authors.lastname: Rosol
authors.forename: L A
authors.initials: LA
authors.lastname: Nagode
authors.forename: C G
authors.initials: CG
authors.lastname: Couto
authors.forename: A S
authors.initials: AS
authors.lastname: Hammer
authors.forename: D J
authors.initials: DJ
authors.lastname: Chew
authors.forename: J L
authors.initials: JL
authors.lastname: Peterson
authors.forename: R D
authors.initials: RD
authors.lastname: Ayl
authors.forename: C L
authors.initials: CL
authors.lastname: Steinmeyer
authors.forename: C C
authors.initials: CC
authors.lastname: Capen
mesh_terms: D000236:Adenoma / Q000503:physiopathology / Q000662:veterinary*; D000818:Animals; D002117:Calcitriol / Q000097:blood*; D002118:Calcium / Q000097:blood; D004283:Dog Diseases; D004285:Dogs; D006934:Hypercalcemia / Q000097:blood / Q000209:etiology / Q000662:veterinary*; D009369:Neoplasms / Q000503:physiopathology / Q000628:therapy / Q000662:veterinary*; D010281:Parathyroid Hormone / Q000097:blood*; D044162:Parathyroid Hormone-Related Protein; D010282:Parathyroid Neoplasms / Q000503:physiopathology / Q000662:veterinary*; D011506:Proteins / Q000032:analysis*; D012016:Reference Values; D012044:Regression Analysis
chemical_list: D010281:Parathyroid Hormone; D044162:Parathyroid Hormone-Related Protein; D011506:Proteins; D002117:Calcitriol; D002118:Calcium