Correlation of glycyrrhetinic acid-like factors (kidney 11beta-HSD2-GALFs) with urinary free cortisol and plasma renin activity in essential hypertension.

Previously we reported that urinary levels of glycyrrhetinic acid-like factors (11beta-HSD2-GALFs) were increased in a subset of patients with essential hypertension when maintained on a low-Na(+) diet. The present studies were undertaken to correlate changes in urinary GALF levels with urinary free cortisol (UFC) and plasma renin activity (PRA). The amounts of GALFs markedly increased from 7.38 +/- 0.80 to 14.58 +/- 1.94 (P < .0003) in the high/normal renin and from 5.60 +/- 0.77 to 8.39 +/- 1.08 (P < .045) in the low renin patients on a low-Na(+) diet compared with high-Na(+) diet with no effect in the normotensive controls (P < .668). The elevated GALF levels in high/normal renin hypertensives maintained on the low-Na(+) diet strongly correlated with the increased UFC levels and also with PRA; no such correlations were observed with either the normotensive controls or low renin hypertensives. In high/normal renin hypertensives, the elevated 11beta-HSD2-GALFs may have two major functions: increased Na(+) retention by the kidney by allowing cortisol to access the renal mineralocorticoid receptor and increased vascular reactivity by allowing cortisol to access the vascular mineralocorticoid receptor.