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Abstract
In order to test the estrogenic activity of sterol oxidation products from cholesterol and phytosterols, an estrogen-dependent gene expression assay was performed in estrogen receptor α-stably transformed HeLa cells. The ranking of the estrogenic potency of these compounds was different: 17β-estradiol >> genistein >> β-epoxycholesterol = daidzein = cholestanetriol = 22(R)-hydroxycholesterol = 20(S)-hydroxycholesterol = sitostanetriol > campestanetriol = β-epoxysitosterol = 7β-hydroxycholesterol. These compounds were not estrogenic in estrogen receptor-negative HeLa cells.