title: Characterization of colon cancer cells: a functional approach characterizing CD133 as a potential stem cell marker.
abstract: BACKGROUND
  Isolation and characterization of tumourigenic colon cancer initiating cells may help to develop novel diagnostic and therapeutic procedures.
  
  
  METHODS
  We characterized a panel of fourteen human colon carcinoma cell lines and their corresponding xenografts for the surface expression of potential stem cell markers CD133, CD24, CD44, CDCP1 and CXCR4. In five cell lines and nine xenografts, mRNA expression of these markers was determined. Tumour growth behaviour of CD133+, CD133- and unsorted SW620 cells was evaluated in vivo.
  
  
  RESULTS
  All five putative stem cell markers showed distinct expression patterns in the tumours examined. Two patient-derived cell lines highly expressed CD133 (> 85% of positive cells) and three other cell lines had an expression level of about 50% whereas in long-term culture based models CD133 expression ranged only from 0 to 20%. In 8/14 cell lines, more than 80% of the cells were positive for CD24 and 11/14 were over 70% positive for CD44. 10/14 cell lines expressed CDCP1 on ≥ 83% of cells. CXCR4 expression was determined solely on 94 L and SW480.Analyses of the corresponding xenografts revealed a significant reduction of cell numbers expressing the investigated surface markers and showed single cell fractions expressing up to three markers simultaneously.Statistical analysis revealed that the CXCR4 mRNA level correlates negatively with the protein expression of CD133, CD44, CD24 and CDCP1 in cell lines and xenografts.A lower differentiation grade of donor material correlated with a higher CDCP1 mRNA expression level in the respective tumour model.In vivo growth behaviour studies of SW620 revealed significantly higher take rates and shorter doubling times in the tumour growth of CD133 positive subclones in comparison to the unsorted cell line or CD133 negative subclones.
  
  
  CONCLUSIONS
  Our data revealed correlations in the expression of surface markers CD44 and CD24 as well as CD44 and CDCP1 and strongly suggest that CD133 is a stem cell marker within our colon carcinoma panel. Further studies will elucidate its role as a potential therapeutic target.
authors.affiliation: Department of Urology, University of Heidelberg, Im Neuenheimer Feld 110, D-69120 Heidelberg, Germany. meike.schneider@med.uni-heidelberg.de
authors.forename: Meike
authors.initials: M
authors.lastname: Schneider
authors.forename: Johannes
authors.initials: J
authors.lastname: Huber
authors.forename: Boris
authors.initials: B
authors.lastname: Hadaschik
authors.forename: Gabrielle M
authors.initials: GM
authors.lastname: Siegers
authors.forename: Heinz-Herbert
authors.initials: HH
authors.lastname: Fiebig
authors.forename: Julia
authors.initials: J
authors.lastname: Schüler
mesh_terms: D000071916:AC133 Antigen; D000328:Adult; D000368:Aged; D000818:Animals; D015703:Antigens, CD / Q000378:metabolism*; D014408:Biomarkers, Tumor / Q000378:metabolism*; D002277:Carcinoma / Q000276:immunology / Q000378:metabolism* / Q000473:pathology; D045744:Cell Line, Tumor; D003110:Colonic Neoplasms / Q000276:immunology / Q000378:metabolism* / Q000473:pathology; D005260:Female; D005434:Flow Cytometry; D006023:Glycoproteins; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D051379:Mice; D008819:Mice, Nude; D008875:Middle Aged; D010455:Peptides; D012333:RNA, Messenger / Q000378:metabolism; D019718:Receptors, CXCR4 / Q000378:metabolism
chemical_list: D000071916:AC133 Antigen; D015703:Antigens, CD; D014408:Biomarkers, Tumor; C527276:CXCR4 protein, human; D006023:Glycoproteins; C000606023:PROM1 protein, human; D010455:Peptides; C000606024:Prom1 protein, mouse; D012333:RNA, Messenger; D019718:Receptors, CXCR4