Abstract
An analytical method based on the combination of multistage mass spectrometry (MSn) and capillary electrophoresis (CE) was developed for the analysis of immunoglobulin G (IgG) glycosylation in rheumatoid arthritis (RA) patients. It has been recently suggested that IgG glycosylation defect may be involved in RA immunopathogenesis. Complete characterization of glycans, including both qualitative and quantitative analysis, requires a combination of different techniques, and accurate, robust, sensitive, and high-throughput methodologies are important for analysis of clinical samples. In the present study, N-glycosylation of IgG in RA patients and in healthy people was characterized through identification of the released glycans using multistage matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF-MSn), and quantitation by CE. Assignment of the IgG N-glycan structures was made through branching pattern analysis by MSn with high-throughput. Further accurate quantitation indicated that galactosylation and sialylation of IgG N-glycans in RA cases were significantly lower than in healthy subjects. The results indicate that CE coupled with MSn can identify abnormal glycosylation of IgG in RA patients compared with healthy people, and that the present work is useful for RA mechanism studies and RA diagnosis.

Qualitative and quantitative analysis of IgG glycosylation in rheumatoid arthritis patients by MALDI-TOF-MSn and capillary electrophoresis





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Acknowledgments
This work was supported by the Scientific Equipment Development of Chinese Academy of Sciences (No.YZ201249) and National High-tech Research and Development Projects (863 Program, No. 2014AA021101). We are also indebted to the Natural Science Foundation of China (No. 31270909) and Major State Basic Research Development Program of China (973 Program, No. 2013CB910100), Great help from Torsten Juelich in Peking University for assistance with discussion and editing is greatly acknowledged.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of Biosafety and Ethics Committee in Institute of Biophysics, Chinese Academy of Sciences, and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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Huang, C., Liu, Y., Wu, H. et al. Characterization of IgG glycosylation in rheumatoid arthritis patients by MALDI-TOF-MSn and capillary electrophoresis. Anal Bioanal Chem 409, 3731–3739 (2017). https://doi.org/10.1007/s00216-017-0302-1
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DOI: https://doi.org/10.1007/s00216-017-0302-1


