Abnormal sodium (Na+) and water handling by the kidney may be the cause of hypertension in rats of the Milan hypertensive strain (MHS). In addition, the plasma cell membrane Ca-ATPase at Vmax is lower in MHS than in normotensive controls (MNS). The isolated kidney preparation was used to explore the role of extracellular free calcium (Ca2+) concentrations (1.25, 1.00 and 0.75 mmol/l) in tubular Na+ transport of pre-hypertensive MHS rats. At the Ca2+ concentration of 1.0 mmol/l, the following parameters were significantly higher (P less than 0.01) in MHS: glomerular filtration rate (GFR) and urinary volume (UV), +104.8 and +147.2%, respectively; urinary Na+ excretion (UNa+), +318.0%; tubular Na+ reabsorption (TNa+), +91.0% and oxygen consumption Q O2, +42.9%. Raising the Ca2+ concentration to 1.25 mmol/l increased UV (+167.0%) and UNa+ (+231.0%) in MHS without substantially affecting MNS. The difference between the two strains was therefore considerably larger for these parameters, but disappeared for TNa+ and Q O2. The overall kidney function of MHS was poor as compared wit renal function at Ca2+ 1.0 mmol/l. The differences between the two strains virtually disappeared at the lowest Ca2+ concentration (0.75 mmol/l); only GFR and TNa+ remained slightly greater in MHS mainly because of the poor viability of MNS kidneys in this experimental condition. It thus appears that the lower activity of Ca2+-ATPase of MHS compared with MNS plasma cell membranes influences the differences in Na+ and water handling in the two strains

Salvati, P., Ferrario, R., Parenti, P., & Bianchi, G. (1987). Renal function of isolated perfused kidneys from hypertensive (MHS) and normotensive (MNS) rats of the Milan strain: role of calcium. JOURNAL OF HYPERTENSION, 5(1), 31-38 [10.1097/00004872-198702000-00005].

Renal function of isolated perfused kidneys from hypertensive (MHS) and normotensive (MNS) rats of the Milan strain: role of calcium

PARENTI, PAOLO;
1987

Abstract

Abnormal sodium (Na+) and water handling by the kidney may be the cause of hypertension in rats of the Milan hypertensive strain (MHS). In addition, the plasma cell membrane Ca-ATPase at Vmax is lower in MHS than in normotensive controls (MNS). The isolated kidney preparation was used to explore the role of extracellular free calcium (Ca2+) concentrations (1.25, 1.00 and 0.75 mmol/l) in tubular Na+ transport of pre-hypertensive MHS rats. At the Ca2+ concentration of 1.0 mmol/l, the following parameters were significantly higher (P less than 0.01) in MHS: glomerular filtration rate (GFR) and urinary volume (UV), +104.8 and +147.2%, respectively; urinary Na+ excretion (UNa+), +318.0%; tubular Na+ reabsorption (TNa+), +91.0% and oxygen consumption Q O2, +42.9%. Raising the Ca2+ concentration to 1.25 mmol/l increased UV (+167.0%) and UNa+ (+231.0%) in MHS without substantially affecting MNS. The difference between the two strains was therefore considerably larger for these parameters, but disappeared for TNa+ and Q O2. The overall kidney function of MHS was poor as compared wit renal function at Ca2+ 1.0 mmol/l. The differences between the two strains virtually disappeared at the lowest Ca2+ concentration (0.75 mmol/l); only GFR and TNa+ remained slightly greater in MHS mainly because of the poor viability of MNS kidneys in this experimental condition. It thus appears that the lower activity of Ca2+-ATPase of MHS compared with MNS plasma cell membranes influences the differences in Na+ and water handling in the two strains
Articolo in rivista - Articolo scientifico
Scientifica
Pressure; Glomerular Filtration Rate; Hydrogen-Ion Concentration; Kidney Concentrating Ability; Rats; Perfusion; Kidney Tubules; Animals; Hypertension; Sodium; Calcium; Kidney
English
Salvati, P., Ferrario, R., Parenti, P., & Bianchi, G. (1987). Renal function of isolated perfused kidneys from hypertensive (MHS) and normotensive (MNS) rats of the Milan strain: role of calcium. JOURNAL OF HYPERTENSION, 5(1), 31-38 [10.1097/00004872-198702000-00005].
Salvati, P; Ferrario, R; Parenti, P; Bianchi, G
File in questo prodotto:
Non ci sono file associati a questo prodotto.

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/10281/25513
Citazioni
  • Scopus 27
  • ???jsp.display-item.citation.isi??? 32
Social impact