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Alzheimers Dement (Amst). 2019 Sep 5;11:619-627. doi: 10.1016/j.dadm.2019.07.002. eCollection 2019 Dec.

Sets of coregulated serum lipids are associated with Alzheimer's disease pathophysiology.

Author information

1
NIH-West Coast Metabolomics Center, University of California, Davis, CA 95616, USA.
2
Rosa & Co LLC, San Carlos, CA, USA.
3
Center for Neuroimaging, Department of Radiology and Imaging Sciences, Indiana University School of Medicine, Indianapolis, IN, USA.
4
Indiana Alzheimer Disease Center, Indiana University School of Medicine, Indianapolis, IN, USA.
5
Medical and Molecular Genetics Department, Indiana University School of Medicine, Indianapolis, IN, USA.
6
Metabolomics Laboratory, Baker Heart and Diabetes Institute, Melbourne, VIC, Australia.
7
Institute of Bioinformatics and Systems Biology, Helmholtz Zentrum München, German Research Center for Environmental Health, Neuherberg, Germany.
8
German Center for Diabetes Research (DZD), Neuherberg, Germany.
9
Department of Psychiatry and Behavioral Sciences, Department of Medicine and the Duke Institute for Brain Sciences, Duke University, Durham, NC, USA.

Abstract

Introduction:

Comorbidity with metabolic diseases indicates that lipid metabolism plays a role in the etiology of Alzheimer's disease (AD). Comprehensive lipidomic analysis can provide new insights into the altered lipid metabolism in AD.

Method:

In this study, a total 349 serum lipids were measured in 806 participants enrolled in the Alzheimer's Disease Neuroimaging Initiative Phase 1 cohort and analyzed using lipid-set enrichment statistics, a data mining method to find coregulated lipid sets.

Results:

We found that sets of blood lipids were associated with current AD biomarkers and with AD clinical symptoms. AD diagnosis was associated with 7 of 28 lipid sets of which four also correlated with cognitive decline, including polyunsaturated fatty acids. Cerebrospinal fluid amyloid beta (Aβ1-42) correlated with glucosylceramides, lysophosphatidylcholines and unsaturated triacylglycerides; cerebrospinal fluid total tau and brain atrophy correlated with monounsaturated sphingomyelins and ceramides, in addition to EPA-containing lipids.

Discussion:

AD-associated lipid sets indicated that lipid desaturation, elongation, and acyl chain remodeling processes are disturbed in AD subjects. Monounsaturated lipid metabolism was important in early stages of AD, whereas the polyunsaturated lipid metabolism was associated with later stages of AD. Our study provides several new hypotheses for studying the role of lipid metabolism in AD.

KEYWORDS:

Alzheimer's disease; Dyslipidemias; Lipid biochemistry; Lipidomics; Mass spectrometry

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