Comparative proteomics analysis of human gastric cancer.
OBJECTIVE
To isolate and identify differentially expressed proteins between cancer and normal tissues of gastric cancer by two-dimensional electrophoresis (2-DE) and matrix-assisted laser desorption/ionization time-of-flight mass spectrometry (MALDI-TOF-MS).


METHODS
Soluble fraction proteins of gastric cancer tissues and paired normal tissues were separated by 2-DE. The differentially expressed proteins were selected and identified by MALDI-TOF-MS and database search.


RESULTS
2-DE profiles with high resolution and reproducibility were obtained. Twenty-three protein spots were excised from sliver staining gel and digested in gel by trypsin, in which fifteen protein spots were identified successfully. Among the identified proteins, there were ten over-expressed and five under-expressed proteins in stomach cancer tissues compared with normal tissues.


CONCLUSIONS
In this study, the well-resolved, reproducible 2-DE patterns of human gastric cancer tissue and paired normal tissue were established and optimized and certain differentially-expressed proteins were identified. The combined use of 2-DE and MS provides an effective approach to screen for potential tumor markers.
Li
Wei
W
Department of Surgery, Shanghai Jiao Tong University School of Medicine, Shanghai 200025, China.
Li
Jian-Fang
JF
Qu
Ying
Y
Chen
Xue-Hua
XH
Qin
Jian-Min
JM
Gu
Qin-Long
QL
Yan
Min
M
Zhu
Zheng-Gang
ZG
Liu
Bing-Ya
BY
D000328:Adult; D000368:Aged; D000595:Amino Acid Sequence; D014408:Biomarkers, Tumor / Q000032:analysis*; D002454:Cell Differentiation; D030562:Databases, Protein; D015180:Electrophoresis, Gel, Two-Dimensional; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D008969:Molecular Sequence Data; D009363:Neoplasm Proteins / Q000032:analysis*; D009367:Neoplasm Staging; D040901:Proteomics / Q000379:methods; D015203:Reproducibility of Results; D019032:Spectrometry, Mass, Matrix-Assisted Laser Desorption-Ionization; D013274:Stomach Neoplasms / Q000737:chemistry* / Q000473:pathology; D053719:Tandem Mass Spectrometry
D014408:Biomarkers, Tumor; D009363:Neoplasm Proteins