title: Anabolic effect of genistein in osteoblastic MC3T3-E1 cells.
abstract: Genistein is a natural isoflavone found in Leguminosae. The effect of genistein on osteoblastic MC3T3-E1 cells was investigated. Cells were cultured for 48 h in the presence of genistein (10(-7)-10(-5) M). Genistein (10(-6) and 10(-5) M) caused a significant elevation of protein content, alkaline phosphatase activity, and deoxyriboncleic acid (DNA) content in the cells. The effect of genistein (10-5 M) in increasing protein content, alkaline phosphatase activity and DNA content in the cells was completely prevented by the presence of cycloheximide (10(-6) M), an inhibitor of protein synthesis, suggesting that the isoflavone's effect results from a newly synthesized protein component. The effect of genistein (10(-5) M) in elevating cellular protein content and alkaline phosphatase activity was completely inhibited by the presence of trifluo-perazine (10(-5) M), staurosporine (10(-7) M) or vanadate (10(-6) M), various protein kinase inhibitors. Moreover, genistein (10(-5) M)-increased protein content and alkaline phosphatase activity in the cells was clearly abolished by the presence of anti-estrogen tamoxifen (10(-6) M). The effect of 17beta-estradiol (10(-9) M) in elevating protein and alkaline phosphatase activity in the cells was not enhanced by the presence of genistein (10(-5) M). Genistein's effect might be partly involved in estrogen action. The present study demonstrates that genistein has an anabolic effect on osteoblastic MC3T3-E1 cells.
authors.affiliation: Laboratory of Endocrinology and Molecular Metabolism, Graduate School of Nutritional Sciences, University of Shizuoka, Shizuoka 422-8526, Japan.
authors.forename: E
authors.initials: E
authors.lastname: Sugimoto
authors.forename: M
authors.initials: M
authors.lastname: Yamaguchi
mesh_terms: D000469:Alkaline Phosphatase / Q000187:drug effects / Q000378:metabolism; D000818:Animals; D004273:DNA, Neoplasm / Q000187:drug effects; D004357:Drug Synergism; D004791:Enzyme Inhibitors / Q000494:pharmacology; D004958:Estradiol / Q000494:pharmacology; D004965:Estrogen Antagonists / Q000494:pharmacology; D019833:Genistein / Q000494:pharmacology*; D006131:Growth Inhibitors / Q000494:pharmacology*; D051379:Mice; D018215:Osteoblastoma; D010006:Osteoblasts / Q000187:drug effects* / Q000378:metabolism*; D047428:Protein Kinase Inhibitors; D011506:Proteins / Q000378:metabolism; D019311:Staurosporine / Q000494:pharmacology; D013629:Tamoxifen / Q000494:pharmacology; D014268:Trifluoperazine / Q000494:pharmacology; D014407:Tumor Cells, Cultured; D014638:Vanadates / Q000494:pharmacology
chemical_list: D004273:DNA, Neoplasm; D004791:Enzyme Inhibitors; D004965:Estrogen Antagonists; D006131:Growth Inhibitors; D047428:Protein Kinase Inhibitors; D011506:Proteins; D013629:Tamoxifen; D014268:Trifluoperazine; D014638:Vanadates; D004958:Estradiol; D019833:Genistein; D000469:Alkaline Phosphatase; D019311:Staurosporine