Estrogen-like Activity and Prevention Effect of Bone Loss in Calcium Deficient Ovariectomized Rats by the Extract ofPleurotus eryngii

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In the course of a search for natural estrogen-like materials from mushrooms, the proliferating effects of the methanol extracts of 14 edible mushrooms on the estrogen-dependent growth of MCF-7 cells were examined. Of the extracts, that from the fruiting body ofPleurotus eryngiishowed the strongest estrogen-like activity, specifically on the proliferating effects of MCF-7 cells. This proliferation effect of the extract from the fruiting body ofP. eryngiiis related to its estrogenic activity, because this proliferation activity was inhibited by the addition of the antiestrogenic compound ICI 182 780. The ethanol extract of the fruiting body ofP. eryngiiprevented ovariectomy-induced bone loss. The present data provide evidence that the ethanol extract ofP. eryngiihelps to protect against the bone loss caused by estrogen deficiency, without having a substantial effect on the uterus.

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