Abstract
Background
Proteomic analysis is a powerful tool for complete establishment of protein expression. Comparative proteomic analysis of human bile from malignant and benign gallbladder diseases may be helpful in research into gallbladder cancer.
Aims
Our objective was to establish biliary protein content for gallbladder cancer, gallbladder adenoma, and chronic calculous cholecystitis for comparative proteomic analysis.
Methods
Bile samples were collected from patients with gallbladder cancer, gallbladder adenoma, and chronic calculous cholecystitis. Peptides of biliary proteins were separated by two-dimensional liquid chromatography then identified by tandem mass spectrometry.
Results
Up to 544, 221, and 495 unique proteins were identified in bile samples from gallbladder cancer, gallbladder adenoma, and chronic calculous cholecystitis. Forty-three, 16, and 28 proteins with more than one unique peptide, respectively, were identified in the three groups. Among these, 30 proteins including S100A8 were overexpressed in gallbladder cancer, compared with benign gallbladder diseases. We also confirmed, by immunohistochemical analysis, that S100A8 is more abundant in tumor-infiltrating immune cells in cancerous tissue.
Conclusions
Compared with benign gallbladder diseases, consistently elevated S100A8 levels in malignant gallbladder bile and tissue indicate that gallbladder cancer is an inflammation-associated cancer. S100A8 may be a biomarker for gallbladder cancer.
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Notes
\( emPAI = 10\frac{{N_{\text{observed}} }}{{N_{\text{observable}} }} - 1 \) where N observed is the number of experimentally observed peptides and N observable is the calculated number of observable peptides for each protein.
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Acknowledgments
The authors thank Guoquan Yan (Institutes of Biomedical Sciences, Fudan University, China) for proteomics support. This research was funded by grants from Science and Technology Commission of Shanghai (no. 09411964600) and the Education Commission of Shanghai (no. 09zz22).
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No conflict of interest exits in the submission of this manuscript.
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Kai-Xing Ai and Wei Wang contributed equally to this work.
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Wang, W., Ai, KX., Yuan, Z. et al. Different Expression of S100A8 in Malignant and Benign Gallbladder Diseases. Dig Dis Sci 58, 150–162 (2013). https://doi.org/10.1007/s10620-012-2307-0
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DOI: https://doi.org/10.1007/s10620-012-2307-0