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Natriuretic effect of equol.

J M Lou, I Giménez, R M Martinez

Journal of Medicinal Food

|March 14, 2009

Summary

This summary is machine-generated.

Urinary phytoestrogens like equol and genistein inhibit NaCl reabsorption in the kidneys, similar to furosemide. These dietary compounds may contribute to lower blood pressure in vegetarians.

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Area of Science:

Nephrology
Endocrinology
Physiology

Background:

The Na-K-Cl cotransporter (NKCC2 isoform) is crucial for NaCl reabsorption in the thick ascending limb of Henle's loop (TALH).
Cotransport inhibitory factors regulate NKCC2 activity, influencing kidney function and blood pressure.
Dietary phytoestrogens are recognized as potential regulators of renal transport.

Purpose of the Study:

To investigate the inhibitory effects of urinary phytoestrogens, specifically equol and genistein, on NKCC2 cotransporter activity.
To compare the salidiuretic potency of these phytoestrogens with furosemide in a preclinical model.

Main Methods:

Utilized an isolated perfused rat kidney model.
Assessed the effects of equol and genistein on cotransport fluxes and salidiuretic activity.
Compared their potency to that of furosemide.

Main Results:

Equol and genistein inhibited cotransporter fluxes at concentrations comparable to furosemide.
Phytoestrogens demonstrated similar salidiuretic potency to furosemide in the isolated perfused rat kidney.
In vivo, furosemide exhibited greater potency than the tested phytoestrogens.

Conclusions:

Dietary phytoestrogens, such as equol and genistein, possess inhibitory effects on renal NaCl reabsorption via NKCC2.
These findings suggest that phytoestrogens may play a role in the lower blood pressure observed in vegetarian populations.
Phytoestrogens represent a class of natural compounds with potential therapeutic implications for blood pressure regulation.