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MicroRNA expression within neuronal-derived small extracellular vesicles in frontotemporal degeneration
Abstract
MicroRNAs (miRNAs) are small non-coding RNA that are powerful regulators of gene expression and can affect the expression of hundreds of genes. miRNAs can be packed in small extracellular vesicles (SEV) and released into the extracellular space by neurons and microglia to act locally as well as pass through the blood-brain barrier and act systemically. We sought to understand the differences in neuronal SEV miRNA expression between frontotemporal dementia (FTD), Alzheimer’s disease (AD), and healthy aging. Plasma was obtained from FTD, AD, and healthy aging participants that were matched based on age, sex, and race/ethnicity. Additionally, a subset of participants also provided paired cerebrospinal fluid samples to compare neuronal SEV miRNAs in plasma and cerebrospinal fluid. Neuronal SEV were isolated using differential ultracentrifugation and antibody conjugated Dynabeads® for the neuronal surface marker, L1CAM. RNA sequencing was performed. 12 FTD, 11 with AD, and 10 healthy aging participants were enrolled in the study. In FTD, SEV miRNA-181c was downregulated compared to healthy controls. In AD, miRNA-122 and miRNA-3591 were downregulated compared to those in healthy controls and FTD. Using an FDR <0.2, only miRNA-21-5p was found to have increased expression in the cerebrospinal fluid compared to plasma in a group of AD and FTD participants. SEV miRNA-181c is significantly downregulated in FTD compared to healthy controls and may mediate its effects through microglial-directed neuroinflammation and interaction with TAR DNA-binding protein 43 (TDP-43) based on pathway analysis. Additionally, the FOXO and Hippo pathways may be important mediators of FTD, based on pathway analysis. Lastly, because only one SEV miRNA was differentially expressed between the plasma and cerebrospinal fluid in paired samples, plasma represents an appropriate biofluid for studying neuronal SEV miRNA.
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“On the other hand, Pounders and colleagues examined the expression of miRNAs in NDEV among FTD and AD patients and CT subjects: their results indicated that miR-181c was downregulated in FTD patients to CT subjects, while miR-122 and miR-3591 were downregulated in AD patients with respect to FTD and CTs [63].”
From miR-92a-3p and miR-320a are Upregulated in Plasma Neuron-Derived Extracellular Vesicles of Patients with Frontotemporal Dementia (2025) · cites this paper as [63]
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“Furthermore, we observed reduced miR-181c-5p levels in the frontal lobe of MAPT and C9ORF72 patients, consistent with a study on CSF exosomes reporting decreased miR-181c-5p expression in FTD patients [47].”
From A role for astrocytic miR-129-5p in frontotemporal dementia (2025) · cites this paper as [47]
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“[13,14] We sought to examine whether SEV miRNA profiles within neuron specific SEVs isolated from plasma differed among FTD, AD, and healthy aging controls.”
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Cited by
Sorted by citations
Manzini, V., Cappelletti, P., Orefice, N. S., Brentari, I., Rigby, M. J., Lo Giudice, M., Feligioni, M., Rivabene, R., Crestini, A., Manfredi, F., et al. (2025) · Molecular Neurobiology · doi:10.1007/s12035-024-04386-z · Cited by 16
A role for astrocytic miR-129-5p in frontotemporal dementia
Kaurani, L., Pradhan, R., Schröder, S., Burkhardt, S., Schuetz, A.-L., Krüger, D. M., Pena, T., Heutink, P., Sananbenesi, F., & Fischer, A. (2025) · Translational Psychiatry · doi:10.1038/s41398-025-03338-y · Cited by 10
Metadata
- Authors
- Pounders, J., Hill, E. J., Hooper, D., Zhang, X., Biesiada, J., Kuhnell, D., Greenland, H. L., Esfandiari, L., Timmerman, E., Foster, F., Wang, C., Walsh, K. B., Shatz, R., Woo, D., Medvedovic, M., Langevin, S., & Sawyer, R. P.
- Affiliations
- University of Cincinnati College of Medicine, Department of Neurology and Rehabilitation Medicine, Cincinnati, OH, USA
- University of Cincinnati College of Medicine, Department of Environmental and Public Health Sciences, Cincinnati, OH, USA
- University of Cincinnati, Department of Electrical Engineering and Computer Science, Cincinnati, OH, USA
- University of Cincinnati College of Medicine, Department of Cancer Biology, Cincinnati, OH, USA
- University of Cincinnati College of Medicine, Department of Emergency Medicine, Cincinnati, OH, USA.
- ORCID
- Sawyer, Russell P.
- Venue
- Medicine
- Published
- 2022-10-07
- Volume
- 101
- Issue
- 40
- Pages
- e30854
- ISSN
- 1536-5964
- PMC
- PMC9542922
- Cited by
- 26
- References
- 2
- Language
- en
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