title: The loss of circadian rhythm for intact parathyroid hormone and nephrogenous cyclic AMP in patients with primary hyperparathyroidism.
abstract: The measurement of serum intact parathyroid hormone (PTH) (1-84) over a 24-h period has shown the existence of a circadian rhythm in normal males which is absent in patients with primary hyperparathyroidism. The physiological significance of this observation is reflected in the presence of parallel changes in nephrogenous cyclic adenosine monophosphate (N-cAMP) in normals which are also absent in primary hyperparathyroidism. Serum calcium, adjusted for variations in albumin concentrations, showed a transient fall in normal subjects prior to the nocturnal rise in PTH (1-84). A similar transient fall in serum adjusted calcium was observed in the hyperparathyroid patients. Serum phosphate showed a circadian rhythm in normal subjects, and an attenuated rhythm persisted in primary hyperparathyroidism. These data suggest that both ionic factors and higher centres play important roles in the fine control of PTH (1-84) secretion.
authors.affiliation: Institute of Biochemistry, Royal Infirmary, Glasgow, UK.
authors.forename: F C
authors.initials: FC
authors.lastname: Logue
authors.forename: W D
authors.initials: WD
authors.lastname: Fraser
authors.forename: S J
authors.initials: SJ
authors.lastname: Gallacher
authors.forename: D A
authors.initials: DA
authors.lastname: Cameron
authors.forename: D S
authors.initials: DS
authors.lastname: O'Reilly
authors.forename: G H
authors.initials: GH
authors.lastname: Beastall
authors.forename: U
authors.initials: U
authors.lastname: Patel
authors.forename: I T
authors.initials: IT
authors.lastname: Boyle
mesh_terms: D000328:Adult; D000368:Aged; D002118:Calcium / Q000097:blood; D002940:Circadian Rhythm / Q000502:physiology*; D000242:Cyclic AMP / Q000097:blood* / Q000652:urine; D006801:Humans; D006961:Hyperparathyroidism / Q000097:blood* / Q000652:urine; D008297:Male; D008875:Middle Aged; D010281:Parathyroid Hormone / Q000097:blood*; D010710:Phosphates / Q000097:blood
chemical_list: D010281:Parathyroid Hormone; D010710:Phosphates; D000242:Cyclic AMP; D002118:Calcium