title: Membrane proteomic analysis of pancreatic cancer cells.
abstract: BACKGROUND
  Pancreatic cancer is one of the most aggressive human tumors due to its high potential of local invasion and metastasis. The aim of this study was to characterize the membrane proteomes of pancreatic ductal adenocarcinoma (PDAC) cells of primary and metastatic origins, and to identify potential target proteins related to metastasis of pancreatic cancer.
  
  
  METHODS
  Membrane/membrane-associated proteins were isolated from AsPC-1 and BxPC-3 cells and identified with a proteomic approach based on SDS-PAGE, in-gel tryptic digestion and liquid chromatography with tandem mass spectrometry (LC-MS/MS). X! Tandem was used for database searching against the SwissProt human protein database.
  
  
  RESULTS
  We identified 221 & 208 proteins from AsPC-1 and BxPC-3 cells, respectively, most of which are membrane or membrane-associated proteins. A hundred and nine proteins were found in both cell lines while the others were present in either AsPC-1 or BxPC-3 cells. Differentially expressed proteins between two cell lines include modulators of cell adhesion, cell motility or tumor invasion as well as metabolic enzymes involved in glycolysis, tricarboxylic acid cycle, or nucleotide/lipid metabolism.
  
  
  CONCLUSIONS
  Membrane proteomes of AsPC-1 (metastatic) and BxPC-3 (primary) cells are remarkably different. The differentially expressed membrane proteins may serve as potential targets for diagnostic and therapeutic interventions.
authors.affiliation: UCLA School of Dentistry & Dental Research Institute, Los Angeles, CA 90095, USA.
authors.forename: Xiaojun
authors.initials: X
authors.lastname: Liu
authors.forename: Min
authors.initials: M
authors.lastname: Zhang
authors.forename: Vay Liang W
authors.initials: VL
authors.lastname: Go
authors.forename: Shen
authors.initials: S
authors.lastname: Hu
mesh_terms: D045744:Cell Line, Tumor; D002853:Chromatography, Liquid / Q000379:methods; D030562:Databases, Protein; D006801:Humans; D008565:Membrane Proteins / Q000032:analysis*; D008969:Molecular Sequence Data; D009362:Neoplasm Metastasis; D009363:Neoplasm Proteins / Q000032:analysis*; D010190:Pancreatic Neoplasms / Q000737:chemistry* / Q000473:pathology; D020543:Proteome / Q000032:analysis*; D053719:Tandem Mass Spectrometry / Q000379:methods
chemical_list: D008565:Membrane Proteins; D009363:Neoplasm Proteins; D020543:Proteome