title: A comparison between protein profiles of B cell subpopulations and mantle cell lymphoma cells.
abstract: BACKGROUND
  B-cell lymphomas are thought to reflect different stages of B-cell maturation. Based on cytogenetics and molecular markers, mantle cell lymphoma (MCL) is presumed to derive predominantly from naïve, pre-germinal centre (pre-GC) B lymphocytes. The aim of this study was to develop a method to investigate the similarity between MCL cells and different B-cell compartments on a protein expression level.
  
  
  METHODS
  Subpopulations of B cells representing the germinal centre (GC), the pre-GC mantle zone and the post-GC marginal zone were isolated from tonsils using automated magnetic cell sorting (AutoMACS) of cells based on their expression of CD27 and IgD. Protein profiling of the B cell subsets, of cell lines representing different lymphomas and of primary MCL samples was performed using top-down proteomics profiling by surface-enhanced laser detection/ionization time-of-flight mass spectrometry (SELDI-TOF-MS).
  
  
  RESULTS
  Quantitative MS data of significant protein peaks (p-value < 0.05) separating the three B-cell subpopulations were generated. Together, hierarchical clustering and principal component analysis (PCA) showed that the primary MCL samples clustered together with the pre- and post-GC subpopulations. Both primary MCL cells and MCL cell lines were clearly separated from the B cells representing the GC compartment.
  
  
  CONCLUSIONS
  AutoMACS sorting generates sufficient purity to enable a comparison between protein profiles of B cell subpopulations and malignant B lymphocytes applying SELDI-TOF-MS. Further validation with an increased number of patient samples and identification of differentially expressed proteins would enable a search for possible treatment targets that are expressed during the early development of MCL.
authors.affiliation: Department of Gene Technology, AlbaNova University Center, Royal Institute of Technology, Stockholm, Sweden. henrik.stranneheim@biotech.kth.se
authors.forename: Henrik
authors.initials: H
authors.lastname: Stranneheim
authors.forename: Lukas M
authors.initials: LM
authors.lastname: Orre
authors.forename: Janne
authors.initials: J
authors.lastname: Lehtiö
authors.forename: Jenny
authors.initials: J
authors.lastname: Flygare