Background: In order to clarify the diuretic mechanisms of Saireito, a Japanese herbal medicine, the mineralcorticoid receptor antagonistic action of Saireito was evaluated in anti-glomerular basement membrane (GBM) nephritic rats.
Methods: Anti-GBM nephritis was induced in rats by the intravenous, injection of anti-GBM serum, and test drugs were administered 5 days after the induction of nephritis. In addition, we also investigated aldosterone-loaded mice to clarify the effects of test drugs on aldosterone signal transduction. In an in vitro study, a mineralocorticoid receptor binding assay of the components of Saireito was performed.
Results: Saireito and spironolactone inhibited the development of proteinuria and abdominal ascites in anti-GBM nephritic rats. Saireito and spironolactone increased the urine volume and decreased the abdominal saline content in aldosterone-loaded mice. Saikosaponin H, a component of Saireito, inhibited the receptor binding of aldosterone in the in vitro assay 50% inhibitory concentration ([IC(50)], 22 micromol/l). Saikosaponin H also inihibited the decrease in urine volume in aldosterone-loaded mice.
Conclusions: These results suggest that the diuretic action of Saireito may be partly due to an antagonistic action on the mineralocorticoid receptor, exerted by saikosaponin H.
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