title: [The influence of aging on parathyroid hormone-induced enhancement in (Ca2+ + Mg2+)-ATPase activity of rabbit renal basolateral membrane].
abstract: We studied the influence of aging on the stimulatory effect of parathyroid hormone (PTH) to (Ca2+ + Mg2+)-ATPase activity of rabbit renal basolateral membrane (BLM). Stimulated by PTH, (Ca2+ + Mg2+)-ATPase activity of BLM from aged rabbits was lower than those from young rabbits. However, the stimulatory effect of cyclic AMP (cAMP) showed no differences in terms of (Ca2+ + Mg2+)-ATPase activity in BLM from aged and young rabbits. As cAMP production in BLM caused by PTH stimulation was not measured, it is unclear whether cAMP production is different in BLM from young and aged rabbits. From these results, we concluded that in BLM from aged rabbit, the lower effect of PTH on (Ca2+ + Mg2+)-ATPase is due to lower production of cAMP or some other disorder of the PTH signal transduction mechanism. As (Ca2+ + Mg2+)-pump plays an important role in Ca2+ reabsorption in kidney, its lower activity in aged rabbit may be one reason for aberration of renal calcium handling.
authors.affiliation: Department of Geriatric Medicine, Osaka University Medical School.
authors.forename: T
authors.initials: T
authors.lastname: Shiraishi
authors.forename: S
authors.initials: S
authors.lastname: Morimoto
authors.forename: K
authors.initials: K
authors.lastname: Itoh
authors.forename: Y
authors.initials: Y
authors.lastname: Miyashita
authors.forename: S
authors.initials: S
authors.lastname: Kitano
authors.forename: T
authors.initials: T
authors.lastname: Nabata
authors.forename: T
authors.initials: T
authors.lastname: Inoue
authors.forename: R
authors.initials: R
authors.lastname: Morita
authors.forename: K
authors.initials: K
authors.lastname: Taniguchi
authors.forename: K
authors.initials: K
authors.lastname: Fukuo
mesh_terms: D000375:Aging / Q000502:physiology*; D000818:Animals; D001485:Basement Membrane / Q000201:enzymology; D017301:Ca(2+) Mg(2+)-ATPase / Q000378:metabolism*; D000252:Calcium-Transporting ATPases / Q000378:metabolism*; D000242:Cyclic AMP / Q000378:metabolism; D007684:Kidney Tubules / Q000201:enzymology*; D010281:Parathyroid Hormone / Q000502:physiology*; D011817:Rabbits; D000254:Sodium-Potassium-Exchanging ATPase / Q000378:metabolism
chemical_list: D010281:Parathyroid Hormone; D000242:Cyclic AMP; D017301:Ca(2+) Mg(2+)-ATPase; D000252:Calcium-Transporting ATPases; D000254:Sodium-Potassium-Exchanging ATPase