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Effect of Serenoa repens extract (Permixon) on estradiol/testosterone-induced experimental prostate enlargement in the rat.

The effect of the lipidosterolic extract of Serenoa repens (LSESR) on experimental prostate enlargement was investigated in three groups of rats: shams treated with LSESR (sham rats), castrated animals treated with estradiol and testosterone (castrated rats), castrated animals treated with estradiol/testosterone and treated with LSESR (castrated and treated rats). Following three months of continuous hormonal treatment, the weight of prostates in estradiol/testosterone-treated castrated rats was significantly increased in comparison with sham-operated rats. Such an increase started rapidly, reached a maximum by 30 days and remained at a plateau or slightly declined thereafter. The increase of prostate total weight induced by the hormone treatment was inhibited by administration of LSESR. Indeed, the weight was significantly lower at day 60 and day 90 for the dorsal and lateral regions of the prostate. The weight of the ventral region of the prostate was significantly lower after 30 and 60 days treatment with LSESR. These results demonstrate that administering LSESR to hormone-treated castrated rats inhibits the increase in prostate wet weight. This effect of LSESR may explain the beneficial effect of this extract in human benign prostatic hypertrophy.