title: Expression profiling by whole-genome microarray hybridization reveals differential gene expression in breast cancer cell lines after lycopene exposure.
abstract: The correlation between diet and variation in gene-expression is an important field which could be considered to approach cancer pathways comprehension. We examined the effects of lycopene on breast cancer cell lines using pangenomic arrays. Lycopene is derived predominantly from tomatoes and tomato products and there is some epidemiologic evidence for a preventive role in breast cancer. Previously, we investigated lycopene in breast cancer using a dedicated breast cancer microarray. To confirm these results and explore pathways other than those implicated in breast cancer, for this study we used pangenomic arrays containing 25,000 oligonucleotides. This in vitro study assayed two human mammary cancer cell lines (MCF-7 and MDA-MB-231), and a fibrocystic breast cell line (MCF-10a) treated or not with 10 microM lycopene for 48 h. A competitive hybridization was performed between Cy3-labeled lycopene treated RNA and Cy5-labeled untreated RNA to define differentially expressed genes. Using t-test analysis, a subset of 391 genes was found to be differentially modulated by lycopene between estrogen-positive cells (MCF-7) and estrogen-negative cells (MDA-MB-231, MCF-10a). Hierarchical clustering revealed 726 discriminatory genes between breast cancer cell lines (MCF-7, MDA-MB-231) and the fibrocystic breast cell line (MCF-10a). Modified gene expression was observed in various molecular pathways, such as apoptosis, cell communication, MAPK and cell cycle as well as xenobiotic metabolism, fatty acid biosynthesis and gap junctional intercellular communication.
authors.affiliation: Département d'Oncogénétique, Centre Jean Perrin, 58 Rue Montalembert, BP 392, 63011 Clermont-Ferrand Cedex 01, France.
authors.forename: Nasséra
authors.initials: N
authors.lastname: Chalabi
authors.forename: Samir
authors.initials: S
authors.lastname: Satih
authors.forename: Laetitia
authors.initials: L
authors.lastname: Delort
authors.forename: Yves-Jean
authors.initials: YJ
authors.lastname: Bignon
authors.forename: Dominique J
authors.initials: DJ
authors.lastname: Bernard-Gallon
mesh_terms: D016588:Anticarcinogenic Agents / Q000494:pharmacology*; D001943:Breast Neoplasms / Q000235:genetics*; D002338:Carotenoids / Q000494:pharmacology*; D045744:Cell Line, Tumor; D005260:Female; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D000077276:Lycopene; D020411:Oligonucleotide Array Sequence Analysis; D018075:RNA, Complementary / Q000378:metabolism
chemical_list: D016588:Anticarcinogenic Agents; D018075:RNA, Complementary; D002338:Carotenoids; D000077276:Lycopene