Renal and vascular actions of equol in the rat.

Abstract:

BACKGROUND:The urinary isoflavonoid equol inhibits membrane Na-K-Cl cotransporters at similar concentrations to those at which furosemide inhibits them, but the significance of this action is not known. OBJECTIVE:To investigate the potential salidiuretic and vascular actions of equol in the rat. METHODS:Renal functioning was assessed in vitro in the isolated perfused kidney and in vivo in conscious rats. The vascular contractility of isolated aorta was assessed. RESULTS:In the isolated perfused kidney equol was concentrated 50- to 70-fold in the urinary fluid, it was 3-4 times less potent than furosemide at increasing diuresis, natriuresis and kaliuresis (the difference was due to its higher protein-binding affinity), and it induced a modest but significant increase in glomerular filtration rate. In vivo, orally administered equol was a modest natriuretic agent, about 8-fold less potent than orally administered furosemide (in molar terms). In isolated aortic rings precontracted by administration of phenylephrine, administration of equol relaxed the contracted aorta at 10-fold lower concentrations (concentration for half-maximal activity 58.9 +/- 16 micromol/l, n = 3) than did furosemide (concentration for half-maximal activity 633 +/- 145 micromol/l, n = 3). CONCLUSIONS:Equol is a modest natriuretic and vasorelaxant agent in the rat. Further studies are required in order to investigate the potential natriuretic and perhaps hypotensive actions of dietary equol precursors (daidzein).

journal_name

J Hypertens

journal_title

Journal of hypertension

authors

Gimenez I,Lou M,Vargas F,Alvarez-Guerra M,Mayoral JA,Martinez RM,Garay RP,Alda JO

doi

10.1097/00004872-199715110-00015

subject

Has Abstract

pub_date

1997-11-01 00:00:00

pages

1303-8

issue

11

eissn

0263-6352

issn

1473-5598

journal_volume

15

pub_type

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