Abstract
In the rat, blocking 11β-OHSD with the active ingredient of liquorice, glycyrrhizic acid (GZA) or its hydrolytic product, 18β-glycyrrhetinic acid (GTA), caused potassium loss, increased water intake and a primary increase in salt appetite that was specific for sodium and not secondary to sodium loss. Intracerebroventricular injection of angiotensin II enhanced the sodium appetite but carbachol did not. The stimulating effects of GZA or GTA on intakes of water and NaCl resembled those caused by the administration of excessive amounts of mineralocorticoid. The results suggest that GZA- or GTA-induced drinking behaviour is mediated by circulating glucocorticoids. After liquorice blockade of 11β-OHSD, the peripheral and central mineralocorticoid receptors are no longer protected from glucocorticoid action.
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