title: Piceatannol, a natural analog of resveratrol, inhibits progression through the S phase of the cell cycle in colorectal cancer cell lines.
abstract: Piceatannol, a naturally occurring analog of resveratrol, was previously identified as the active ingredient in herbal preparations in folk medicine and as an inhibitor of p72(Syk). We studied the effects of piceatannol on growth, proliferation, differentiation and cell cycle distribution profile of the human colon carcinoma cell line Caco-2. Growth of Caco-2 and HCT-116 cells was analyzed by crystal violet assay, which demonstrated dose- and time-dependent decreases in cell numbers. Treatment of Caco-2 cells with piceatannol reduced proliferation rate. No effect on differentiation was observed. Determination of cell cycle distribution by flow cytometry revealed an accumulation of cells in the S phase. Immunoblotting demonstrated that cyclin-dependent kinases (cdk) 2 and 6, as well as cdc2 were expressed at steady-state levels, whereas cyclin D1, cyclin B1 and cdk 4 were downregulated. The abundance of p27(Kip1) was also reduced, whereas the protein level of cyclin E was enhanced. Cyclin A levels were enhanced only at concentrations up to 100 micromol/L. These changes also were observed in studies with HCT-116 cells. On the basis of our findings, piceatannol can be considered to be a promising chemopreventive or anticancer agent.
authors.affiliation: 2nd Department of Medicine, J. W. Goethe University, 60590 Frankfurt/Main, Germany.
authors.forename: Freya
authors.initials: F
authors.lastname: Wolter
authors.forename: Antje
authors.initials: A
authors.lastname: Clausnitzer
authors.forename: Bora
authors.initials: B
authors.lastname: Akoglu
authors.forename: Jürgen
authors.initials: J
authors.lastname: Stein
mesh_terms: D000469:Alkaline Phosphatase / Q000378:metabolism; D000970:Antineoplastic Agents / Q000494:pharmacology*; D015153:Blotting, Western; D018938:Caco-2 Cells; D002453:Cell Cycle / Q000187:drug effects; D002455:Cell Division; D015179:Colorectal Neoplasms / Q000188:drug therapy* / Q000378:metabolism; D018844:Cyclin-Dependent Kinases / Q000378:metabolism; D016213:Cyclins / Q000187:drug effects / Q000378:metabolism; D004305:Dose-Response Relationship, Drug; D005434:Flow Cytometry; D006801:Humans; D016196:S Phase / Q000187:drug effects*; D013267:Stilbenes / Q000494:pharmacology*; D013997:Time Factors; D014407:Tumor Cells, Cultured
chemical_list: D000970:Antineoplastic Agents; D016213:Cyclins; D013267:Stilbenes; C041525:3,3',4,5'-tetrahydroxystilbene; D018844:Cyclin-Dependent Kinases; D000469:Alkaline Phosphatase