Isobaric mass tagging and triple quadrupole mass spectrometry to determine lipid biomarker candidates for Alzheimer's disease

Autoři: Suzumi M. Tokuoka aff001;  Yoshihiro Kita aff001;  Takao Shimizu aff001;  Yoshiya Oda aff001
Působiště autorů: The University of Tokyo, Graduate School of Medicine, Lipidomics Laboratory, Hongo, Bunkyo-Ku, Tokyo aff001
Vyšlo v časopise: PLoS ONE 14(12)
Kategorie: Research Article


The isobaric tagging method widely used in proteomic and lipidomic fields, with the multiple reaction monitoring (MRM) approach using a triple quadrupole mass spectrometer, was applied to identify biomarker candidates from plasma samples for Alzheimer’s disease (AD). We focused on the following phospholipids that have amino groups as the functional group: phosphatidylethanolamine (PE), Lyso-PE, phosphatidylserine, and Lyso-phosphatidylserine. We also investigated fatty acids that have a carboxy group. A sixplex tandem mass tag (TMT) was used for the isobaric tagging method in this study. The TMT reaction had high reproducibility in human plasma. A total of 196 human plasma samples from three AD cohorts were used for the study, and compared to pooled plasma quality control (QC) samples. The described method required only 40 MRM measurements, including the pooled QC samples, for a full comparison of the data. We found that the content of free fatty acids increased in AD samples in all the three cohorts, alkenyl PEs (ePEs) decreased over a one-year interval in AD patients, and ePEs weakly correlated with amyloid peptide (a-beta) 1–42 in cerebrospinal fluid. In conclusion, total free fatty acids in plasma are a risk factor for AD, and ePEs monitor candidates for AD. Therefore, TMT-lipidomics is a powerful approach for the determination of plasma biomarkers because of the high sample throughput.

Klíčová slova:

Alzheimer's disease – Biomarkers – Blood plasma – Fatty acids – Lipid analysis – Lipids – Phospholipids – Reproducibility


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2019 Číslo 12
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