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19-Oxoandrost-4-ene-3,17-dione amplifies the action of aldosterone
1Third Department of Internal Medicine, University of Tokyo, Faculty of Medicine, Japan.
Abstract:
The amplification of the action of aldosterone by 19-oxoandrost-4-ene-3,17-dione (19-oxo-A-dione) was evaluated by mineralocorticoid bioassays using adrenalectomized rats. Pretreatment of rats with 19-oxo-A-dione did not cause any significant change in urinary Na/K ratio. However, aldosterone caused a significantly lower urinary Na/K ratio and Na excretion in rats pretreated with 19-oxo-A-dione than in rats without pretreatment. These results indicate that the sodium-retaining action of aldosterone is amplified by pretreatment with 19-oxo-A-dione.