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Comprehensive analysis of glycosphingolipid glycans by lectin microarrays and MALDI-TOF mass spectrometry

Abstract

Glycosphingolipids (GSLs) are ubiquitous glycoconjugates present on the cell membrane; they play significant roles in many bioprocesses such as cell adhesion, embryonic development, signal transduction and carcinogenesis. Analyzing such amphiphilic molecules is a major challenge in the field of glycosphingolipidomics. We provide a step-by-step protocol that uses a lectin microarray to analyze GSL glycans from cultured cells. The procedure describes (i) extraction of GSLs from cell pellets, (ii) N-monodeacylation using sphingolipid ceramide N-deacylase digestion to form lyso-GSLs, (iii) fluorescence labeling at the newly exposed amine group, (iv) preparation of a lectin microarray, (v) GSL-glycan analysis by a lectin microarray, (vi) complementary mass spectrometry analysis and (vii) data acquisition and analysis. This method is high-throughput, low cost and easy to conduct, and it provides detailed information about glycan linkages. This protocol takes ~10 d.

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Fig. 1: Flowchart illustrating the steps involved in this protocol.
Fig. 2: Lectin microarray analysis of GSL glycans from HL-7702, HMCC97L, HMCC97H and HCCLM3 cell lines.
Fig. 3: MALDI-TOF mass spectra of GSL glycans identified and annotated with proposed structures according to the results of lectin microarrays.
Fig. 4: MALDI-TOF/TOF-MS analysis of GSL-glycan precursor ions in the mass spectra.

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Data availability

The authors declare that all the data generated or analyzed during this study are available within the protocol. Source data are provided with this paper.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (no. 81372365 and no. 81871955).

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Contributions

H.D. and H.Y. designed and performed the experiments. H.D., H.Y. and F.Y. designed and performed the data acquisition and analysis. H.D. and Z.L. prepared the manuscript.

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Correspondence to Zheng Li.

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The authors declare no competing interests.

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Peer review information Nature Protocols thanks Ruijun Tian and the other, anonymous, reviewer(s) for their contribution to the peer review of this work.

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Key reference using this protocol

Du, H. et al. Anal. Chem. 91, 10663–10671 (2019): https://doi.org/10.1021/acs.analchem.9b01945

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Du, H. et al. Anal. Chem. 91, 10663–10671 (2019): https://doi.org/10.1021/acs.analchem.9b01945

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Du, H., Yu, H., Yang, F. et al. Comprehensive analysis of glycosphingolipid glycans by lectin microarrays and MALDI-TOF mass spectrometry. Nat Protoc 16, 3470–3491 (2021). https://doi.org/10.1038/s41596-021-00544-y

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