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Mammalian lignans and genistein decrease the activities of aromatase and 17beta-hydroxysteroid dehydrogenase in MCF-7
Jennifer D Brooks1, Lilian U Thompson
1Department of Nutritional Sciences, Faculty of Medicine, University of Toronto, 150 College St., Toronto, Ont., Canada M5S 3E2.
Summary
Dietary compounds enterolactone (EL), enterodiol (ED), and genistein (GEN) inhibit key enzymes in estrogen synthesis, reducing breast cancer cell proliferation. These findings suggest a potential mechanism for breast cancer prevention by modulating local estrogen production.
Area of Science:
- Biochemistry
- Molecular Biology
- Oncology
Background:
- Estrogen is a key driver in breast cancer development and progression.
- Enzymes like aromatase and 17beta-hydroxysteroid dehydrogenase (17beta-HSD) are crucial for estrogen synthesis in breast tissue.
- Targeting these enzymes offers a strategy for breast cancer treatment and prevention.
Purpose of the Study:
- To investigate the inhibitory effects of genistein (GEN), enterolactone (EL), and enterodiol (ED) on aromatase and 17beta-HSD type 1 activity in MCF-7 breast cancer cells.
- To determine if these compounds reduce estradiol (E2) production and subsequent cancer cell proliferation.
Main Methods:
- MCF-7 cells were treated with varying concentrations of EL, ED, and GEN.
- Estrone (E1) and estradiol (E2) production were measured to assess enzyme inhibition.
- Cell proliferation was quantified to correlate with reduced estrogen synthesis.
Main Results:
- EL, ED, and GEN significantly inhibited estrone (E1) production via aromatase.
- EL and GEN markedly reduced estradiol (E2) production by inhibiting 17beta-HSD type 1.
- Inhibition of E1 and E2 production by EL and GEN correlated with reduced MCF-7 cell proliferation.
Conclusions:
- Enterodiol (ED), enterolactone (EL), and genistein (GEN) modulate local estrogen synthesis by inhibiting key enzymes.
- This modulation of estrogen production represents a potential mechanism for breast cancer chemoprevention.