Plasma levels of prorenin and renin in blacks and whites: their relative abundance and associations with plasma aldosterone concentration.
BACKGROUND
All renin arises from prorenin. The proportion of renin relative to prorenin could influence overall renin-angiotensin-aldosterone activity. We sought to determine whether prorenin levels were related to extracellular volume, as reflected by the levels of plasma renin activity (PRA), and to aldosterone.


METHODS
We analyzed plasma levels of prorenin, renin, and aldosterone, as well as their interactions, in 129 young blacks and whites.


RESULTS
Blacks had lower plasma renin concentration (PRC) and PRA, but had prorenin levels similar to whites (69 pg/ml in blacks vs. 62 pg/ml in whites, P = 0.41). As a result, the renin-to-total renin ratio was significantly lower in blacks (11.5% in blacks as compared to 19.8% in whites; P = 0.0001). Because prorenin also resides in tissues including the adrenal where it can bind to a specific receptor to generate angiotensin II, we examined the relationship of prorenin levels to plasma aldosterone concentrations (PAC). While a positive association between PRC and PAC was found in both blacks and whites, PAC was positively related to prorenin in whites (P = 0.04) but negatively in blacks, an observation that we hypothesize was due to reduced prorenin-to-renin conversion in blacks.


CONCLUSIONS
We observed a disproportionately high level of prorenin in blacks. These high circulating prorenin levels however do not result in greater adrenal angiotensin II and aldosterone production in healthy young blacks.
Department of Medicine, Indiana University School of Medicine, Indianapolis, Indiana, USA. wtu1@iupui.edu
Wanzhu
W
Tu
George J
GJ
Eckert
J Howard
JH
Pratt
A H
AH
Jan Danser
D000328:Adult; D000450:Aldosterone / Q000097:blood*; D044383:Black People; D004792:Enzyme Precursors / Q000097:blood; D005260:Female; D006801:Humans; D008297:Male; D012083:Renin / Q000097:blood*; D044465:White People
D004792:Enzyme Precursors; D000450:Aldosterone; D012083:Renin