title: Genistein inhibition of the growth of human breast cancer cells: independence from estrogen receptors and the multi-drug resistance gene.
abstract: The effect of isoflavones on the growth of the human breast carcinoma cell lines, MDA-468 (estrogen receptor negative), and MCF-7 and MCF-7-D-40 (estrogen receptor positive), has been examined. Genistein is a potent inhibitor of the growth of each cell line (IC50 values from 6.5 to 12.0 micrograms/ml), whereas biochanin A and daidzein are weaker growth inhibitors (IC50 values from 20 to 34 micrograms/ml). The isoflavone beta-glucosides, genistin and daidzin, have little effect on growth (IC50 values greater than 100 micrograms/ml). The presence of the estrogen receptor is not required for the isoflavones to inhibit tumor cell growth (MDA-468 vs MCF-7 cells). In addition, the effects of genistein and biochanin A are not attenuated by overexpression of the multi-drug resistance gene product (MCF-7-D40 vs MCF-7 cells).
authors.affiliation: Department of Biochemistry, University of Alabama, Birmingham 35294.
authors.forename: G
authors.initials: G
authors.lastname: Peterson
authors.forename: S
authors.initials: S
authors.lastname: Barnes
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology*; D001943:Breast Neoplasms; D002455:Cell Division / Q000187:drug effects; D002460:Cell Line; D004351:Drug Resistance / Q000235:genetics*; D005260:Female; D019833:Genistein; D006801:Humans; D007529:Isoflavones / Q000494:pharmacology*; D011505:Protein-Tyrosine Kinases / Q000037:antagonists & inhibitors; D011960:Receptors, Estrogen / Q000032:analysis / Q000502:physiology*
chemical_list: D000970:Antineoplastic Agents; D007529:Isoflavones; D011960:Receptors, Estrogen; C004742:daidzein; D019833:Genistein; D011505:Protein-Tyrosine Kinases; C004541:biochanin A