title: Identification of differentially expressed proteins between human esophageal immortalized and carcinomatous cell lines by two-dimensional electrophoresis and MALDI-TOF-mass spectrometry.
abstract: OBJECTIVE
  To identify the differentially expressed proteins between the human immortalized esophageal epithelial cell line (SHEE) and the malignant transformed esophageal carcinoma cell line (SHEEC), and to explore new ways for studying esophageal carcinoma associated genes.
  
  
  METHODS
  SHEE and SHEEC cell lines were used to separate differentially expressed proteins by two-dimensional electrophoresis. The silver-stained 2-D gels was scanned with EDAS290 digital camera system and analyzed with the PDQuest 6.2 Software. Six spots in which the differentially expressed protein was more obvious were selected and analyzed with matrix-assisted laser desorption/ionization time of flying mass spectrometry (MALDI-TOF-MS).
  
  
  RESULTS
  There were 107+/-4.58 and 115+/-9.91 protein spots observed in SHEE and SHEEC respectively, and the majority of these spots between the two cell lines matched each other (r=0.772), only a few were expressed differentially. After analyzed by MALDI-TOF-MS and database search for the six differentially expressed proteins, One new protein as well as other five sequence-known proteins including RNPEP-like protein, human rRNA gene upstream sequence binding transcription factor, uracil DNA glycosylase, Annexin A2 and p300/CBP-associated factor were preliminarily identified.
  
  
  CONCLUSIONS
  These differentially expressed proteins might play an importance role during malignant transformation of SHEEC from SHEE. The identification of these proteins may serve as a new way for studying esophageal carcinoma associated genes.
authors.affiliation: Department of Biochemistry and Molecular Biology, Shantou University Medical College, Shantou 515031, Guangdong Province, China.
authors.forename: Xing-Dong
authors.initials: XD
authors.lastname: Xiong
authors.forename: Li-Yan
authors.initials: LY
authors.lastname: Xu
authors.forename: Zhong-Ying
authors.initials: ZY
authors.lastname: Shen
authors.forename: Wei-Jia
authors.initials: WJ
authors.lastname: Cai
authors.forename: Jian-Min
authors.initials: JM
authors.lastname: Luo
authors.forename: Ya-Li
authors.initials: YL
authors.lastname: Han
authors.forename: En-Min
authors.initials: EM
authors.lastname: Li
mesh_terms: D002461:Cell Line, Transformed; D015180:Electrophoresis, Gel, Two-Dimensional; D004938:Esophageal Neoplasms / Q000737:chemistry*; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D009363:Neoplasm Proteins / Q000032:analysis* / Q000235:genetics; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization
chemical_list: D009363:Neoplasm Proteins