He Y, Xie Q, Wang Y, Liang Y, Xu X, Li Y, Miao J, Chen Z, Li Y. Liquid chromatography mass spectrometry-based O-glycomics to evaluate glycosylation alterations in gastric cancer.
Proteomics Clin Appl 2015;
10:206-15. [PMID:
26255982 DOI:
10.1002/prca.201500041]
[Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2015] [Revised: 07/06/2015] [Accepted: 08/03/2015] [Indexed: 02/02/2023]
Abstract
PURPOSE
Gastric 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 DESIGN
We 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.
RESULTS
The 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 RELEVANCE
Glycomics 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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