Abstract
Lipid metabolic changes under diseased conditions, particularly in solid tumors, are attracting increased attention. However, in non-solid tumors, including most hematopoietic tumors, lipid analyses are scarce. Multiple myeloma (MM) is a plasma cell disorder arising from bone marrow, and the lipid status of MM cells has not been reported yet. In this study, we analyzed flow cytometry-sorted single MM cells and normal plasma cells (NPCs) using matrix-assisted laser desorption/ionization–imaging mass spectrometry (MALDI–IMS), a two-dimensional label-free mass spectrometry technique for biomolecular analysis, to obtain specific lipid information. We isolated 1.31–5.77 % of MM cells and 0.03–0.24 % of NPCs using fluorescence-activated cell sorting (FACS). Analysis of purified cells using MALDI–IMS at the single-cell level revealed that the peak intensity and ion signals of phosphatidylcholine [PC (16:0/20:4) + H]+ at m/z 782.5 were significantly decreased in MM cells compared to NPCs. By examining particular cell populations rather than cell mixtures, our method can become a suitable tool for the analysis of rare cell populations at the single-cell level and advance the understanding of MM progression.
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Acknowledgments
This work was supported by grants from the Japan Society for the Promotion of Science (Grant Number 25293044), the Ministry of Education, Culture, Sports, Science and Technology (Grant Number 25116712), and the Ministry of Health, Labor, and Welfare (Grant Number H23-Iryoukiki-Ippan-001). We appreciate the cooperation of all staff in our laboratory and in the Department of Hematology at Hamamatsu University Hospital. We proudly remember the kind support of Mr. Shibata at the Center of Facilities for Common Use in the Hamamatsu University School of Medicine.
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The authors declare that they have no competing interests.
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Published in the topical collection New Applications of Mass Spectrometry in Biomedicine with guest editors Fumio Nomura, Mitsutoshi Setou, and Toshimitsu Niwa.
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Hossen, M.A., Nagata, Y., Waki, M. et al. Decreased level of phosphatidylcholine (16:0/20:4) in multiple myeloma cells compared to plasma cells: a single-cell MALDI–IMS approach. Anal Bioanal Chem 407, 5273–5280 (2015). https://doi.org/10.1007/s00216-015-8741-z
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DOI: https://doi.org/10.1007/s00216-015-8741-z