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Translational Neurodegeneration
Published in: Translational Neurodegeneration 1/2019

Open Access 01-12-2019 | Alzheimer's Disease | Research

Exploratory study on microRNA profiles from plasma-derived extracellular vesicles in Alzheimer’s disease and dementia with Lewy bodies

Authors: Ana Gámez-Valero, Jaume Campdelacreu, Dolores Vilas, Lourdes Ispierto, Ramón Reñé, Ramiro Álvarez, M. Pilar Armengol, Francesc E. Borràs, Katrin Beyer

Published in: Translational Neurodegeneration | Issue 1/2019

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Abstract

Background

Because of the increasing life expectancy in our society, aging-related neurodegenerative disorders are one of the main issues in global health. Most of these diseases are characterized by the deposition of misfolded proteins and a progressive cognitive decline. Among these diseases, Alzheimer’s disease (AD) and dementia with Lewy bodies (DLB) are the most common types of degenerative dementia. Although both show specific features, an important neuropathological and clinical overlap between them hampers their correct diagnosis. In this work, we identified molecular biomarkers aiming to improve the misdiagnosis between both diseases.

Methods

Plasma extracellular vesicles (EVs) -from DLB, AD and healthy controls- were isolated using size-exclusion chromatography (SEC) and characterized by flow cytometry, Nanoparticle Tracking Analysis (NTA) and cryo-electron microscopy. Next Generation Sequencing (NGS) and related bibliographic search was performed and a selected group of EV-associated microRNAs (miRNAs) was analysed by qPCR.

Results

Results uncovered two miRNAs (hsa-miR-451a and hsa-miR-21-5p) significantly down-regulated in AD samples respect to DLB patients, and a set of four miRNAs (hsa-miR-23a-3p, hsa-miR-126-3p, hsa-let-7i-5p, and hsa-miR-151a-3p) significantly decreased in AD respect to controls. The two miRNAs showing decreased expression in AD in comparison to DLB provided area under the curve (AUC) values of 0.9 in ROC curve analysis, thus suggesting their possible use as biomarkers to discriminate between both diseases. Target gene analysis of these miRNAs using prediction online tools showed accumulation of phosphorylation enzymes, presence of proteasome-related proteins and genes involved in cell death among others.

Conclusion

Our data suggest that plasma-EV associated miRNAs may reflect a differential profile for a given dementia-related disorder which, once validated in larger cohorts of patients, could help to improve the differential diagnosis of DLB versus AD.
Appendix
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Metadata
Title
Exploratory study on microRNA profiles from plasma-derived extracellular vesicles in Alzheimer’s disease and dementia with Lewy bodies
Authors
Ana Gámez-Valero
Jaume Campdelacreu
Dolores Vilas
Lourdes Ispierto
Ramón Reñé
Ramiro Álvarez
M. Pilar Armengol
Francesc E. Borràs
Katrin Beyer
Publication date
01-12-2019
Publisher
BioMed Central
Published in
Translational Neurodegeneration / Issue 1/2019
Electronic ISSN: 2047-9158
DOI
https://doi.org/10.1186/s40035-019-0169-5

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