title: [Identification of aging related proteins in human normal colonic epithelium].
abstract: OBJECTIVE
  To explore the molecular mechanisms of colonic epithelial aging related proteins and aged colonic epithelial susceptibility to tumor.
  
  
  METHODS
  The proteins of normal human colonic epithelial tissue from young and old people were separated by 2-dimensional gel electrophoresis (2DGE), respectively. Then gels were stained by silver, scanned by imagescanner and analyzed with PDQuest software. The differentially expressed protein spots of colonic epithelium between the old and the young groups were identified by peptide mass fingerprint based on matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF-MS) and database searching.
  
  
  RESULTS
  Well-resolved and reproducible 2DGE maps of normal human colonic epithelium from the young and the old were acquired. Nineteen more than 2 fold differentially expressed protein spots were identified representing 17 different proteins by MALDI-TOF-MS. The functions of these proteins involve in metabolism, energy generation, transportation, antioxidation, translation and protein folding.
  
  
  CONCLUSIONS
  Seventeen aging related proteins of human colonic epithelium identified indicate that injury of mitochondrial function and decline of antioxidant capability are important reasons for the aging of human colonic epithelium. These data provided useful clues for elucidating the mechanisms of colonic epithelial aging and aged colonic epithelial susceptibility to cancer.
authors.affiliation: Key Laboratory of Cancer Proteomics of Chinese Ministry of Public Health, Xiangya Hospital, Central South University, Changsha.
authors.forename: Guo
authors.initials: G
authors.lastname: Zhu
authors.forename: Zhi-qiang
authors.initials: ZQ
authors.lastname: Xiao
authors.forename: Zhu-chu
authors.initials: ZC
authors.lastname: Chen
authors.forename: Jian-ling
authors.initials: JL
authors.lastname: Li
authors.forename: Peng-fei
authors.initials: PF
authors.lastname: Zhang
authors.forename: Yi-xuan
authors.initials: YX
authors.lastname: Yang
authors.forename: Xue-ping
authors.initials: XP
authors.lastname: Feng
authors.forename: Wei-jian
authors.initials: WJ
authors.lastname: Yuan
mesh_terms: D000375:Aging / Q000378:metabolism; D002478:Cells, Cultured; D016922:Cellular Senescence / Q000235:genetics*; D018118:Chloride Channels / Q000096:biosynthesis* / Q000235:genetics; D003106:Colon / Q000166:cytology*; D044927:Electron-Transferring Flavoproteins / Q000096:biosynthesis* / Q000235:genetics; D004847:Epithelial Cells / Q000166:cytology*; D006801:Humans; D007413:Intestinal Mucosa / Q000166:cytology; D011506:Proteins / Q000378:metabolism
chemical_list: C501966:CLIC1 protein, human; D018118:Chloride Channels; C500318:ETFA protein, human; D044927:Electron-Transferring Flavoproteins; D011506:Proteins