Abstract
Introduction
High-fat diets increase risk for Alzheimer’s disease, but individuals with the risk gene APOE ε4 (E4) paradoxically have improved memory soon after high fat feeding. Little is known about how dietary lipids affect CNS lipids, especially in older adults.
Objectives
We analyzed the lipidomic signature of cerebrospinal fluid (CSF) in older adults who underwent both a saline and TG infusion. We further analyzed these data by E4 carrier status.
Methods
Older adults (n = 21, age 67.7 ± 8.6) underwent a 5-h TG and saline infusion on different days in random crossover design; lumbar CSF was collected at the end of the infusion. Lipids were extracted using dichloromethane/methanol and 13 classes of lipids analyzed using the Lipidyzer platform consisting of an AB Sciex 5500 MS/MS QTraps system equipped with a SelexION for differential mobility spectrometry (DMS). Multiple reaction monitoring was used to target and quantify 1070 lipids in positive and negative ionization modes with and without DMS.
Results
The TG infusion increased total lipids in the CSF, including the appearance of more lipids at the detection limit in the TG samples compared to saline (Chi square p < 0.0001). The infusion increased the total level of diacylglycerols and lysophosphatidylcholines and reduced dihydroceramides. Of the possible 1070 lipids detectable, we found 348 after saline and 365 after TG infusion. Analysis using MetaboAnalyst revealed 11 specific lipids that changed; five of these lipids decreased after TG infusion, and four of them differed by E4 status, but none differed by cognitive diagnosis or sex.
Conclusion
These results in older adults show that blood lipids affect lipid profiles in CSF and such profiles are modified by APOE status. This suggests that how the CNS handles lipids may be important in the AD phenotype.
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Acknowledgements
Alzheimer’s disease research center at University of Washington, and the Northwest Metabolomics Research Center.
Funding
This study was funded by 1K23AG047978-01A1 and 1S10OD021562-01 from the National Institutes of Health, the Veterans Affairs Medical Center, and the Chair of Medicine scholars award from the University of Washington School of Medicine.
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AJH conceptualized the study, undertook statistical analysis and interpreted results and wrote/revised manuscript; WAB conceptualized the study, assisted with result interpretation and revised manuscript; LFP and RP collected data, assisted with result interpretation and revised manuscript. DR conceptualized the study, assisted with result interpretation and revised manuscript. SC collected data and was the PI of the parent clinical study, and revised manuscript.
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Hanson, A.J., Banks, W.A., Bettcher, L.F. et al. Cerebrospinal fluid lipidomics: effects of an intravenous triglyceride infusion and apoE status. Metabolomics 16, 6 (2020). https://doi.org/10.1007/s11306-019-1627-x
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DOI: https://doi.org/10.1007/s11306-019-1627-x