title: Effect of tea polyphenols on growth of oral squamous carcinoma cells in vitro.
abstract: Epidemiologic evidence indicates that both black and green tea is a rich source of flavonoids and other polyphenolic antioxidants which protects against heart disease and cancer. In the current investigation, utilizing human oral squamous carcinoma cell line SCC-25, we have evaluated the effect of three major tea constituents, (-)-epigallocatechin-3-gallate (EGCG), (-)-epicatechin-3-gallate (ECG) and (-)-epigallocatechin (EGC) on cell growth and DNA synthesis. Test agents in concentrations of 50, 80, 100 and 200 microM were incubated in triplicates in DMEM-HAM's F-12 (50: 50) supplemented with 10% calf serum and antibiotics in an atmosphere of 5% CO2 in air for 72 hrs. Cell growth was determined by alamarBlue assay method and DNA synthesis was measured by the incorporation of [3H]-thymidine in nuclear DNA. At the four dose levels used, the three compounds induced significant dose-dependent inhibition in cell growth. In DNA study, the three compounds exhibited stimulatory effect at 50 microM followed by significant dose-dependent inhibitory effect (10 to 100%) at 80, 100 and 200 microM dose levels. Dose-dependent changes in cell morphology were also observed with phase-contrast microscopy after cell treatment with EGCG.
authors.affiliation: Hormone Research Laboratory, University of Missouri-Kansas City, School of Dentistry and Medicine, Kansas City, MO 64108, USA.
authors.forename: T M
authors.initials: TM
authors.lastname: Elattar
authors.forename: A S
authors.initials: AS
authors.lastname: Virji
mesh_terms: D000970:Antineoplastic Agents / Q000494:pharmacology*; D002294:Carcinoma, Squamous Cell / Q000188:drug therapy / Q000378:metabolism / Q000473:pathology*; D002392:Catechin / Q000031:analogs & derivatives* / Q000494:pharmacology; D002455:Cell Division / Q000187:drug effects; D004273:DNA, Neoplasm / Q000096:biosynthesis; D004305:Dose-Response Relationship, Drug; D005419:Flavonoids / Q000494:pharmacology; D006131:Growth Inhibitors / Q000494:pharmacology*; D006801:Humans; D010636:Phenols / Q000494:pharmacology*; D011108:Polymers / Q000494:pharmacology*; D013662:Tea; D014062:Tongue Neoplasms / Q000188:drug therapy / Q000378:metabolism / Q000473:pathology*; D014407:Tumor Cells, Cultured / Q000187:drug effects
chemical_list: D000970:Antineoplastic Agents; D004273:DNA, Neoplasm; D005419:Flavonoids; D006131:Growth Inhibitors; D010636:Phenols; D011108:Polymers; D013662:Tea; D002392:Catechin; C062669:epicatechin gallate; C045651:epigallocatechin gallate; C057580:gallocatechol