title: Identification and expression of a tumor-associated antigen in esophageal squamous cell carcinoma.
abstract: OBJECTIVE
  To search for novel tumor associated antigens (TAA) in esophageal squamous cell carcinoma (ESCC).
  
  
  METHODS
  The proteins extracted from tissues of ESCC were separated by two dimensional polyacrylamide gel electrophoresis and transferred to PVDF membrane. Sera from ESCC patients and healthy individuals were used for primary antibodies for Western blot analysis. The differential spots were excised for trypsin hydrolysis and the tryptic peptides were analyzed by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS). The identified TAA of ESCC was validated by immunohistochemical staining (IHC).
  
  
  RESULTS
  Sera from ESCC patients yielded multiple positive spots, and one 28 800 Da protein that exhibited positive reactivity with 60% (12/20) sera of ESCC patients and only 5% (1/20) sera of healthy controls (P<0.01). The 28 800 Da protein was identified as phosphoglycerate mutase 1 (PGAM1) by MALDI-TOF-MS. Immunohistochemical analysis showed that PGAM1 was located in both cytoplasm and nucleus, and had a higher expression in cancer tissues.
  
  
  CONCLUSIONS
  PGAM1 maybe a candidate of ESCC.
authors: Department of Abdominal Surgery, Cancer Institute & Hospital, CAMS and PUMC, Beijing 100021, China.
authors: Hong-jun
authors: HJ
authors: Gao
authors: Zhi-gang
authors: ZG
authors: Yue
authors: Min
authors: M
authors: Zheng
authors: Zhao-xu
authors: ZX
authors: Zheng
mesh_terms: D000328:Adult; D000368:Aged; D000951:Antigens, Neoplasm / Q000378:metabolism*; D014408:Biomarkers, Tumor / Q000378:metabolism; D002294:Carcinoma, Squamous Cell / Q000378:metabolism*; D004938:Esophageal Neoplasms / Q000378:metabolism*; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010736:Phosphoglycerate Mutase / Q000378:metabolism*
chemical_list: D000951:Antigens, Neoplasm; D014408:Biomarkers, Tumor; D010736:Phosphoglycerate Mutase