title: Analysis of protein expression in pure cell nuclei populations isolated from human breast cancer tissue by DNA flow cytometric sorting.
abstract: In this study, cell nuclei from aneuploid breast cancer samples were sorted with respect to DNA content into pure diploid and aneuploid fractions using flow cytometry. The nuclear proteins were then separated by one-dimensional gel electrophoresis (1D-PAGE) and differences in protein expression patterns, between diploid and aneuploid nuclei from the same tumours, were compared. Using a combination of peptide finger printing and peptide identification by MALDI-TOF mass spectrometry, we identified proteins and confirmed that the proteins were of nuclear origins. The results in this study add further information to the knowledge about the breast cancer disease complexity and heterogeneity at molecular level. For some of the tumours studied different nuclei protein patterns were obtained, in the diploid respective aneuploid nuclei populations, whilst other tumours did not show these differences.
authors.affiliation: Dept. of Oncology, Clinical Sciences, Lund University, Barngatan 2B, SE-221 85 Lund, Sweden.
authors.forename: Bo
authors.initials: B
authors.lastname: Baldetorp
authors.forename: Maria
authors.initials: M
authors.lastname: Johansson
authors.forename: Christian
authors.initials: C
authors.lastname: Ingvar
authors.forename: Lotta
authors.initials: L
authors.lastname: Lundgren
authors.forename: Håkan
authors.initials: H
authors.lastname: Olsson
authors.forename: Bo
authors.initials: B
authors.lastname: Jansson
authors.forename: Charlotte
authors.initials: C
authors.lastname: Welinder
mesh_terms: D000328:Adult; D000782:Aneuploidy; D014408:Biomarkers, Tumor / Q000378:metabolism; D001943:Breast Neoplasms / Q000378:metabolism* / Q000473:pathology*; D002467:Cell Nucleus / Q000378:metabolism*; D004247:DNA / Q000032:analysis*; D005260:Female; D005434:Flow Cytometry / Q000379:methods*; D020869:Gene Expression Profiling; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D008875:Middle Aged; D009362:Neoplasm Metastasis; D009687:Nuclear Proteins / Q000378:metabolism; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D014408:Biomarkers, Tumor; D009687:Nuclear Proteins; D004247:DNA