Abstract
The present study was designed to investigate whether antihypertensive and natriuretic effects of K were achieved by elevation of nitric oxide (NO) production in Dahl salt-sensitive (DS) rats. The rats were placed in individual metabolic cage and fed a high sodium diet with or without K supplementation for 4 weeks. K supplementation counteracted the blood-pressure raising effect of NaCl. K supplementation significantly enhanced sodium excretion and reduced sodium retention, increased the urinary nitrite plus nitrate excretion and kidney constitutive NO synthase activity in salt-loaded DS rats. These effect did not occur in the rats fed a low sodium diet with K supplementation. These results suggest that K supplementation attenuates development of hypertension with reduction of sodium retension in salt-loaded DS rats, which is mediated by the recovery of salt-induced NO production mechanism.
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