title: Serum 1-84 and 7-84 parathyroid hormone concentrations and bone in patients with primary hyperparathyroidism.
abstract: OBJECTIVE
  Parathyroid hormone (PTH) acts on bone as both anabolic and catabolic factor. It includes two fractions: 1-84 (cyclase activating PTH, CAP) which increases bone turnover and serum calcium, and 7-84 (cyclase inactivating PTH, CIP) acting the opposite way. The aim of this study was to establish whether bone mineral density (BMD) and turnover in patients' primary hyperparathyroidism (HPT) are dependent on CAP and CIP concentrations.
  
  
  METHODS
  Thirty-one patients with HPT and 29 appropriately matched controls were examined. Parameters of calcium-phosphate homeostasis and BMD were estimated.
  
  
  RESULTS
  BMD of radius shaft was lower in patients with HPT as compared with controls, whereas BMD of spine and ultradistal radius were similar. Serum calcium, bone alkaline phosphatase, total PTH, 1-84 PTH, and 7-84 PTH were higher in HPT patients, whereas serum phosphate was lower and beta cross-laps similar. Both total PTH and CAP correlated significantly with BMD of radius shaft and serum calcium concentration, but not with other examined parameters.
  
  
  CONCLUSIONS
  Total and 1-84 PTH are similarly associated with examined parameters in patients with HPT. Thus, determination of serum CAP concentration does not seem to have advantages over total PTH with regard to bone mineral density and bone turnover assessment in those patients.
authors.affiliation: Department of Internal Diseases, Endocrinology and Diabetology, Central Clinical Hospital MSWiA, Warsaw, Poland.
authors.forename: A
authors.initials: A
authors.lastname: Blachowicz
authors.forename: W
authors.initials: W
authors.lastname: Chudzinski
authors.forename: I
authors.initials: I
authors.lastname: Nawrot
authors.forename: B
authors.initials: B
authors.lastname: Kryszalowicz
authors.forename: U
authors.initials: U
authors.lastname: Spiechowicz
authors.forename: J
authors.initials: J
authors.lastname: Szmidt
authors.forename: A
authors.initials: A
authors.lastname: Wiecek
authors.forename: E
authors.initials: E
authors.lastname: Franek
mesh_terms: D000328:Adult; D000368:Aged; D000469:Alkaline Phosphatase / Q000097:blood; D014408:Biomarkers, Tumor / Q000097:blood*; D015519:Bone Density / Q000502:physiology*; D002118:Calcium / Q000097:blood; D005260:Female; D006801:Humans; D049950:Hyperparathyroidism, Primary / Q000097:blood*; D008297:Male; D008875:Middle Aged; D010281:Parathyroid Hormone / Q000097:blood*; D010446:Peptide Fragments / Q000097:blood*; D011379:Prognosis; D012016:Reference Values
chemical_list: D014408:Biomarkers, Tumor; D010281:Parathyroid Hormone; D010446:Peptide Fragments; C414937:parathyroid hormone (7-84); D000469:Alkaline Phosphatase; D002118:Calcium