Journal
PROTEOMICS CLINICAL APPLICATIONS
Volume 10, Issue 2, Pages 206-215Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/prca.201500041
Keywords
1-Phenyl-3-methyl-5-pyrazolone; Gastric cancer; LC-MS; O-glycan; Serum
Funding
- National Science and Technology key projects during the Twelfth Five-Year Plan Period of China [2012ZX09401-014, 2012ZX09502001-001, 2012CB822100]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1075]
- Natural Science Foundation of Jiangsu Province [BK20140370]
- Jiangsu Provincial Innovative Research Team
- Priority Academic Program Development of Jiangsu Higher Education Institutions
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PurposeGastric cancer is the fourth most common malignant cancer worldwide. Important for tumorigenesis and progression, aberrant glycosylation occurs frequently in cancers. We investigated the differences in O-glycosylation in the serum of 157 gastric cancer patients (GC) and 144 healthy donors. Experimental designWe used the method of labeling O-glycans (released from proteins) with 1-phenyl-3-methyl-5-pyrazolone followed by LC-MS analysis. Analyzing the LC-MS data by partial least squares discriminant and unpaired Student t test, combined with the structural information of O-glycans from LC-MS/MS in positive mode. ResultsThe expression level of core1, core2, ST antigen, and core2 complex O-glycans (m/z 733.33, m/z 809.42) were increased significantly (p < 0.0001), whereas m/z 529.75 and diST-antigen were decreased in the serum of GC compared with controls (p < 0.001). In addition, there were significant correlations between the abundance of the O-glycans and glycoproteins (MUC1, CEA) in the serum of GC. Conclusion and clinical relevanceGlycomics approaches identified multiple candidate antigens for patients with GC. The O-glycan structures are increased in the serum of GC, they may be candidates for carbohydrate tumor markers.
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