期刊
ANALYTICAL CHEMISTRY
卷 93, 期 13, 页码 5537-5546出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.analchem.1c00064
关键词
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资金
- National Key Research and Development Program of China [2016YFA0501303, 2018YFC0910300]
- NSF of China [21974025, 31670835]
- Shanghai Projects [19ZR1403200, B109]
- Shanghai Key Laboratory of Clinical Geriatric Medicine [13DZ2260700]
A comprehensive strategy combining linkage-specific derivatization and charge-sensitive separation method was developed for specific analysis of alpha-2,3-sialylated N-glycan linkage isomers. This new approach demonstrated successful sensitive profiling and reproducible quantitation of serum alpha-2,3-sialylated N-glycome from ovarian cancer patients, identifying significant changes in certain glycan structures.
Sialylated N-glycan isomers with alpha-2,3 and alpha-2,6 linkages play crucial and distinctive roles in diverse physiological and pathological processes. Changes of alpha-2,3-linked sialic acids in sialylated N-glycans are especially important in monitoring the initiation and progression of diseases. However, the specific analysis of alpha-2,3-sialylated N-glycan linkage isomers remains challenging due to their extremely low abundance and technical limitations in separation and detection. Herein, we designed an integrated strategy that combines linkage-specific derivatization and a charge-sensitive separation method based on microfluidic chip capillary electrophoresis-mass spectrometry (microchip CE-MS) for specific analysis of alpha-2,3-sialylated N-glycan linkage isomers for the first time. The alpha-2,6- and alpha-2,3-sialic acids were selectively labeled with methylamine (MA) and N,N-dimethylethylenediamine (DMEN), respectively, which selectively makes alpha-2,3-sialylated N-glycans positively charged and realizes online purification, concentration, and discrimination of alpha-2,3-sialylated N-glycans from other N-glycans in microchip CE-MS. This new approach was demonstrated with standard multisialylated N-glycans, and it was found that only the alpha-2,3-sialylated N-glycans migrated and were detected in order according to the number of alpha-2,3-sialic acids. Finally, this strategy was successfully applied in highly sensitive profiling and reproducible quantitation of the serum alpha-2,3-sialylated N-glycome from ovarian cancer (OC) patients, where 7 of 33 detected alpha-2,3-sialylated N-glycans significantly changed in the OC group compared with healthy controls.
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