Abstract
Early detection and rational therapy for gastric cancer are crucial. In this study we undertook comparative proteomics for identification of gastric carcinoma biomarkers using pooled laser capture microdissected GA cells and matched nonmalignant gastric mucosa epithelial cells. The method involved separation of total proteins by 1D SDS-PAGE, trypsin digestion, and postdigest 18O/16O labeling followed by nano-HPLC-MS/MS for peptide identification and relative quantification. A total of 78 differentially expressed proteins were identified, among these proteins, 42 proteins were up-regulated in GA and 36 proteins were down-regulated. Some differentially expressed proteins were further validated by western blot analysis.
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Abbreviations
- GA:
-
Gastric adenocarcinoma
- LCM:
-
Laser capture microdissection
- HPLC-MS/MS:
-
High performance liquid chromatography coupled with tandem mass spectrometry
- ESI-Q-TOF-MS:
-
Electrospray ionization quadrupole–time of flight mass spectrometry
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Acknowledgments
This work was supported by National Natural Science Foundation of China (30000028, 30240056, 30370642), key research program from Science and Technology Committee of Hunan, China (04sk1006-2).
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Z. ZhiQiang and L. MaoYu have contributed equally to this work.
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ZhiQiang, Z., MaoYu, L., GuiYing, Z. et al. Identification of human gastric carcinoma biomarkers by differential protein expression analysis using 18O labeling and NanoLC-MS/MS coupled with laser capture microdissection. Med Oncol 27, 296–303 (2010). https://doi.org/10.1007/s12032-009-9208-x
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DOI: https://doi.org/10.1007/s12032-009-9208-x