Abstract
Phospholipids are vital constituents of the cell membrane and aid in signal transduction. Phospholipid profiles vary distinctively with the cell type. Notably, specific phospholipid molecules are present in significantly higher or lower concentrations in cancer cells versus normal cells. In this study, live single-cell mass spectrometry (MS) was developed for analyzing phospholipids at the single-cell level. This method facilitates rapid molecular analysis of cells under microscopic observation. For nanoelectrospray ionization, phospholipids were extracted from single cells isolated in a glass capillary through a high-efficiency process. Cell-derived phosphatidylcholines were detected with high sensitivity when trehalose C14 was added as a solubilizing reagent. Trehalose C14 can solubilize cells at low concentrations owing to its low critical micelle concentration, and exerts minimal matrix effects (such as suppressing ionization and causing peak overlap) in the MS analysis of cellular molecules. Analyses of phospholipids in Raji and HEV0070 cells using the developed method revealed specific peaks of phosphatidylcholine and sphingomyelin in the respective cells. The developed technique not only affords phospholipid profiles at the single-cell level, but also holds promise for identifying biomarkers associated with various diseases, particularly cancer.
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The data analyzed during the current study are available from the corresponding author on request.
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Acknowledgements
This study was supported in part of Grant-in-Aid for Scientific Research (19K07028 and 22K06551) from the Ministry of Education, Culture, Sports, Science, and Technology of Japan (H.M.).
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JS, AF, and HM performed the experiments and analyzed the data. HM and AF contributed to experimental design. ES and IS contributed to analyzing data. KT and HM supervised this work. The manuscript was written by HM in collaboration with the other authors. All authors have approved the final version of the manuscript.
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Sakata, J., Furusho, A., Sugiyama, E. et al. Development of a highly efficient solubilization method for mass spectrometric analysis of phospholipids in living single cells. ANAL. SCI. 40, 917–924 (2024). https://doi.org/10.1007/s44211-024-00542-6
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DOI: https://doi.org/10.1007/s44211-024-00542-6