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Absolute quantitative lipidomics reveals lipidome-wide alterations in aging brain

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Abstract

Introduction

The absolute quantitation of lipids at the lipidome-wide scale is a challenge but plays an important role in the comprehensive study of lipid metabolism.

Objectives

We aim to develop a high-throughput quantitative lipidomics approach to enable the simultaneous identification and absolute quantification of hundreds of lipids in a single experiment. Then, we will systematically characterize lipidome-wide changes in the aging mouse brain and provide a link between aging and disordered lipid homeostasis.

Methods

We created an in-house lipid spectral library, containing 76,361 lipids and 181,300 MS/MS spectra in total, to support accurate lipid identification. Then, we developed a response factor-based approach for the large-scale absolute quantifications of lipids.

Results

Using the lipidomics approach, we absolutely quantified 1212 and 864 lipids in human cells and mouse brains, respectively. The quantification accuracy was validated using the traditional approach with a median relative error of 12.6%. We further characterized the lipidome-wide changes in aging mouse brains, and dramatic changes were observed in both glycerophospholipids and sphingolipids. Sphingolipids with longer acyl chains tend to accumulate in aging brains. Membrane-esterified fatty acids demonstrated diverse changes with aging, while most polyunsaturated fatty acids consistently decreased.

Conclusion

We developed a high-throughput quantitative lipidomics approach and systematically characterized the lipidome-wide changes in aging mouse brains. The results proved a link between aging and disordered lipid homeostasis.

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Acknowledgements

The work is financially supported by National Natural Science Foundation of China (Grant No. 21575151). Z.-J. Z. is supported by Thousand Youth Talents Program from Government of China.

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Correspondence to Zheng-Jiang Zhu.

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Conflict of interest

All authors declare no competing financial interest.

Ethical approval

All institutional and national guidelines for the care and use of biological samples were followed. The data were acquired in accordance with appropriate ethical requirements. No human study was involved in this work. All experiments on mice were conducted according to the protocols approved by Animal Care Committee of the Interdisciplinary Research Center on Biology and Chemistry (IRCBC), Chinese Academy of Sciences (CAS).

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Tu, J., Yin, Y., Xu, M. et al. Absolute quantitative lipidomics reveals lipidome-wide alterations in aging brain. Metabolomics 14, 5 (2018). https://doi.org/10.1007/s11306-017-1304-x

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  • DOI: https://doi.org/10.1007/s11306-017-1304-x

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