title: Correlation of lipidomic composition of cell lines and tissues of breast cancer patients using hydrophilic interaction liquid chromatography/electrospray ionization mass spectrometry and multivariate data analysis.
abstract: BACKGROUND
  The goal of this work is the comparison of differences in the lipidomic compositions of human cell lines derived from normal and cancerous breast tissues, and tumor vs. normal tissues obtained after the surgery of breast cancer patients.
  
  
  METHODS
  Hydrophilic interaction liquid chromatography/electrospray ionization mass spectrometry (HILIC/ESI-MS) using the single internal standard approach and response factors is used for the determination of relative abundances of individual lipid species from five lipid classes in total lipid extracts of cell lines and tissues. The supplementary information on the fatty acyl composition is obtained by gas chromatography/mass spectrometry (GC/MS) of fatty acid methyl esters. Multivariate data analysis (MDA) methods, such as nonsupervised principal component analysis (PCA), hierarchical clustering analysis (HCA) and supervised orthogonal partial least-squares discriminant analysis (OPLS-DA), are used for the visualization of differences between normal and tumor samples and the correlation of similarity between cell lines and tissues either for tumor or normal samples.
  
  
  RESULTS
  MDA methods are used for differentiation of sample groups and also for identification of the most up- and downregulated lipids in tumor samples in comparison to normal samples. Observed changes are subsequently generalized and correlated with data from tumor and normal tissues of breast cancer patients. In total, 123 lipid species are identified based on their retention behavior in HILIC and observed ions in ESI mass spectra, and relative abundances are determined.
  
  
  CONCLUSIONS
  MDA methods are applied for a clear differentiation between tumor and normal samples both for cell lines and tissues. The most upregulated lipids are phospholipids (PL) with a low degree of unsaturation (e.g., 32:1 and 34:1) and also some highly polyunsaturated PL (e.g., 40:6), while the most downregulated lipids are PL containing polyunsaturated fatty acyls (e.g., 20:4), plasmalogens and ether lipids. Copyright © 2016 John Wiley & Sons, Ltd.
authors.affiliation: University of Pardubice, Faculty of Chemical Technology, Department of Analytical Chemistry, Studentská 573, 53210, Pardubice, Czech Republic.
authors.forename: Eva
authors.initials: E
authors.lastname: Cífková
authors.affiliation: University of Pardubice, Faculty of Chemical Technology, Department of Analytical Chemistry, Studentská 573, 53210, Pardubice, Czech Republic.
authors.forename: Miroslav
authors.initials: M
authors.lastname: Lísa
authors.affiliation: Masaryk Memorial Cancer Institute, Regional Centre for Applied Molecular Oncology, Žlutý kopec 7, 65653, Brno, Czech Republic.
authors.forename: Roman
authors.initials: R
authors.lastname: Hrstka
authors.affiliation: Palacký University, Medical School and Teaching Hospital, Department of Oncology, I.P.Pavlova 6, 77520, Olomouc, Czech Republic.
authors.forename: David
authors.initials: D
authors.lastname: Vrána
authors.affiliation: Tomáš Baťa University in Zlín, Atlas Hospital, Department of Surgery, nám T. G. Masaryka 5555, 76001, Zlín, Czech Republic.
authors.forename: Jiří
authors.initials: J
authors.lastname: Gatěk
authors.affiliation: Palacký University, Medical School and Teaching Hospital, Department of Oncology, I.P.Pavlova 6, 77520, Olomouc, Czech Republic.
authors.forename: Bohuslav
authors.initials: B
authors.lastname: Melichar
authors.affiliation: University of Pardubice, Faculty of Chemical Technology, Department of Analytical Chemistry, Studentská 573, 53210, Pardubice, Czech Republic.
authors.forename: Michal
authors.initials: M
authors.lastname: Holčapek
mesh_terms: D001940:Breast / Q000737:chemistry* / Q000378:metabolism; D001943:Breast Neoplasms / Q000737:chemistry* / Q000378:metabolism; D045744:Cell Line, Tumor; D002853:Chromatography, Liquid / Q000379:methods*; D005260:Female; D006801:Humans; D057927:Hydrophobic and Hydrophilic Interactions; D008055:Lipids / Q000032:analysis*; D015999:Multivariate Analysis; D025341:Principal Component Analysis; D021241:Spectrometry, Mass, Electrospray Ionization / Q000379:methods*
chemical_list: D008055:Lipids