Abstract
Introduction
Advances in high-resolution mass spectrometry have created renewed interest for studying global lipid biochemistry in disease and biological systems.
Objectives
Here, we present an untargeted 30 min. LC-MS/MS platform that utilizes positive/negative polarity switching to perform unbiased data dependent acquisitions (DDA) via higher energy collisional dissociation (HCD) fragmentation to profile more than 1000–1500 lipid ions mainly from methyl-tert-butyl ether (MTBE) or chloroform:methanol extractions.
Methods
The platform uses C18 reversed-phase chromatography coupled to a hybrid QExactive Plus/HF Orbitrap mass spectrometer and the entire procedure takes ~10 h from lipid extraction to identification/quantification for a data set containing 12 samples (~4 h for a single sample). Lipids are identified by both accurate precursor ion mass and fragmentation features and quantified using LipidSearch and Elements software.
Results
Using this approach, we are able to profile intact lipid ions from up to 18 different main lipid classes and 66 subclasses. We show several studies from different biological sources, including cultured cancer cells, resected tissues from mice such as lung and breast tumors and biological fluids such as plasma and urine.
Conclusions
Using mouse embryonic fibroblasts, we showed that TSC2−/− KD significantly abrogates lipid biosynthesis and that rapamycin can rescue triglyceride (TG) lipids and we show that SREBP−/− shuts down lipid biosynthesis significantly via mTORC1 signaling pathways. We show that in mouse EGFR driven lung tumors, a large number of TGs and phosphatidylmethanol (PMe) lipids are elevated while some phospholipids (PLs) show some of the largest decrease in lipid levels from ~ 2000 identified lipid ions. In addition, we identified more than 1500 unique lipid species from human blood plasma.
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Acknowledgements
We thank the Daniel Tenen lab at BIDMC for providing frozen lung tissue. We also thank Simon Dillon and Towia Libermann at BIDMC for providing human plasma samples. This study was funded by grants from the National Institutes of Health 5P01CA120964 (B.D.M. and J.M.A.), 5P30CA006516 (J.M.A.), and R35CA197459 (B.D.M.), from the National Science Foundation DGE-1144152 (S.R.), and the BIDMC Research Capital Fund for funding the mass spectrometry instrumentation (J.M.A.).
Author Contributions
J.M.A., Y.X., S.B.B., S.R. and D.P. developed the platform. J.M.A., MY., S.R. and S.B.B. wrote the protocol. D.P. and B.M. edited the protocol and provided insight. Y.X, S.R., S.B.B. and M.Y. prepared biological samples for testing the protocol. J.M.A., M.Y., S.B. and S.R. analyzed data.
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This article does not contain any studies with human participants or animals performed by any of the authors. Mouse tissue and human plasma samples were previously acquired and stored frozen by other laboratories.
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Breitkopf, S.B., Ricoult, S.J.H., Yuan, M. et al. A relative quantitative positive/negative ion switching method for untargeted lipidomics via high resolution LC-MS/MS from any biological source. Metabolomics 13, 30 (2017). https://doi.org/10.1007/s11306-016-1157-8
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DOI: https://doi.org/10.1007/s11306-016-1157-8