Abstract
Our previous study on kidney cortical slices showed that Bay K 8644, a dihydropyridine calcium channel agonist, produced a dose-dependent inhibitory action on the release of renin. The present study was performed to examine the effect of Bay K 8644 on renal function and renin secretion in vivo. When Bay K 8644 was directly infused into the renal artery of anesthetized rats, 2 μg/kg/min had no effect on renal blood flow (RBF) and glomerular filtration rate (GFR), but decreased urine flow (UF), urinary sodium excretion (U NaV) and fractional sodium excretion (FE Na) by about 30%, 55% and 35%, respectively, thereby suggesting that Bay K 8644 enhanced the tubular reabsorption of water and sodium. When 10 μg/kg/min were infused, RBF, GFR, UF, U NaV and FE Na decreased to about 95%, 70%, 35% and 30% of each control value. The administration of Bay K 8644 at 10 μg/kg/min did not influence the basal levels of plasma renin activity (PRA) and renin secretion rate (RSR), but did inhibit significantly isoproterenol-induced increasing effects on PRA and RSR. These results indicate that the activation of volatage-dependent calcium channels with Bay K 8644 influences the control of renal function and renin secretion in vivo.
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