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. 1977 Jul;60(1):129–138. doi: 10.1172/JCI108749

Urinary kallikrein and plasma renin activity as determinants of renal blood flow. The influence of race and dietary sodium intake.

S B Levy, J J Lilley, R P Frigon, R A Stone
PMCID: PMC372351  PMID: 874078

Abstract

We investigated the relationship of the kallikrein-kinin system and the renin-angiotensin system in the regulation of blood pressure, salt and water excretion, and renal blood flow. Normotensive and hypertensive black and white men were studied during unresticted sodium intake as well as on a 10-meq/day sodium intake; potassium intake was held constant throughout the study (80 meq/day). During unrestricted sodium intake, urinary kallikrein activity was greater in white normotensives than white hypertensives or black normotensives. There was no difference (P greater than 0.05) between white and black hypertensives or between black normotensives and black hypertensives. All groups had greater urinary kallikrein activity on low sodium vs. unrestricted sodium intake, but the increase in black hypertensives was small, and they excreted significantly less kallikrein than the ogher groups on the low sodium diet. Plasma renin activity showed similar increments after sodium restriction in all groups. Urinary kallikrein activity correlated with renal blood flow in all groups except the black normotensives on low sodium intake. Renal blood flow could be correlated uniformly with log (urinary kallikrein activity/supine plasma renin activity) in all groups on either diet. Urinary sodium and potassium excretion and urine volume were not different among the groups. We conclude: (a) important racial differences exist in urinary kallikrein activity that are unrelated to sodium or potassium excretion or urine volume; (b) dietary sodium restriction further delineates racial differences and suggests alternative pathophysiologic mechanisms for huma hypertension; (c) urinary kallikrein activity correlates with renal blood flow; and (d) our data support the concept that the kallikrein-kinin system and the renin-angiotensin system contribute to the regulation of renal blood flow and may account for racial differences in renal vascular resistance.

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Selected References

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