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We studied the effects of a potassium supplement on urinary kallikrein excretion in a setting of high sodium intake after sodium deprivation with diuretics in young patients with borderline hypertension. Eleven patients, who took the potassium supplementation during the high sodium diet period, showed lower increments in mean blood pressure with salt loading than 12 patients without the potassium supplementation. In the non-potassium-supplemented patients, urinary kallikrein was increased significantly when plasma renin activity (PRA), plasma aldosterone concentration (PAC), and urinary aldosterone were increased during the diuretic treatment. It was decreased significantly when the other hormones were decreased during the sodium load. During the high sodium diet period, PRA, PAC and urinary aldosterone were greater in the potassium-supplemented patients than in the non-potassium-supplemented ones, but urinary kallikrein excretion was not higher when potassium was supplemented. Thus, the present results did not support the theory that the kallikrein-kinin system may be involved in the natriuretic and antihypertensive effects of potassium. In addition, these finding suggest that some kallikrein-modulating factor(s) may counteract the increased urinary kallikrein excretion with the augmented renin-angiotensin-aldosterone system during salt loading with potassium supplementation.

The effect of sodium and potassium loading on urinary kallikrein-like activity in young patients with borderline hypertension.