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Mitochondrial RNA in Alzheimer’s disease circulating extracellular vesicles

journal contribution
posted on 07.01.2021, 21:02 by KM Kim, Q Meng, O Perez de Acha, M Mustapic, A Cheng, E Eren, G Kundu, Y Piao, R Munk, WH Wood, S De, JH Noh, M Delannoy, Lesley SimLesley Sim, K Abdelmohsen, D Kapogiannis, M Gorospe
© Copyright © 2020 Kim, Meng, Perez de Acha, Mustapic, Cheng, Eren, Kundu, Piao, Munk, Wood, De, Noh, Delannoy, Cheng, Abdelmohsen, Kapogiannis and Gorospe. Alzheimer’s disease (AD) is the most common type of dementia. Amyloid β (Aβ) plaques, tau-containing neurofibrillary tangles, and neuronal loss leading to brain atrophy are pathologic hallmarks of AD. Given the importance of early diagnosis, extensive efforts have been undertaken to identify diagnostic and prognostic biomarkers for AD. Circulating extracellular vesicles (EVs) provide a platform for “liquid biopsy” biomarkers for AD. Here, we characterized the RNA contents of plasma EVs of age-matched individuals who were cognitively normal (healthy controls (HC)) or had mild cognitive impairment (MCI) due to AD or had mild AD dementia (AD). Using RNA sequencing analysis, we found that mitochondrial (mt)-RNAs, including MT-ND1-6 mRNAs and other protein-coding and non-coding mt-RNAs, were strikingly elevated in plasma EVs of MCI and AD individuals compared with HC. EVs secreted from cultured astrocytes, microglia, and neurons after exposure to toxic conditions relevant to AD pathogenesis (Aβ aggregates and H2O2), contained mitochondrial structures (detected by electron microscopy) and mitochondrial RNA and protein. We propose that in the AD brain, toxicity-causing mitochondrial damage results in the packaging of mitochondrial components for export in EVs and further propose that mt-RNAs in plasma EVs can be diagnostic and prognostic biomarkers for MCI and AD.

Funding

This work was supported by the National Institute on Aging Intramural Research Program, National Institutes of Health, by the research fund of Chungnam National University, and by grant NRF-2020R1C1C1010869 (to KK).

History

School

  • School of Molecular Sciences

Publication Date

16/11/2020

Journal

Frontiers in Cell and Developmental Biology

Volume

8

Article Number

581882

Pagination

14p. (p. 1-14)

Publisher

Frontiers Media

ISSN

2296-634X

Rights Statement

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