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Microglia-Derived Extracellular Vesicles from Alzheimer’s Disease Patients Carry miRNAs Driving a Neuroinflammatory Response
Skaiste Arbaciauskaite, Simona Silvestri, Pingyan Luo, Christina Krüger, Zoé J. Mossmann, Susann Allelein, Alexander Scholz, Dennis Löffler et al.. Molecular Neurobiology, 2026-01-01
Topic: Brain proteins, microglia and lab models
Alzheimer's disease (AD) represents the most common cause of dementia and urgently requires sensitive biomarkers and effective therapies. Extracellular vesicles represent membranous nano-sized particles secreted from cells, which serve as intercellular messengers participating in central nervous system (CNS) homeostasis, but also are implicated in AD pathogenesis. In addition, EVs containing disease-specific signatures, such as microRNAs (miRNAs), are considered as potent tools for the diagnosis and treatment of AD and other brain disorders. In this study, we used TMEM119 antibody to immunocapture microglia-derived EVs from cerebrospinal fluid (CSF) of AD patients and control subjects. EVs harvested from these CSF samples contained distinct disease-specific miRNA profiles, as assessed by small RNA sequencing. Using a HEK TLR reporter cell system, we found that these miRNA are potent activators of human TLR8, an established RNA sensor. Out of the miRNAs present in AD-associated EVs, selected oligonucleotides were synthesized and loaded into BV2 microglia-derived EVs. Exposure of primary murine microglia to these miRNA-loaded EVs led to TNF release from these cells, thereby driving a neuroinflammatory response. Taken together, putatively microglia-derived EVs from the CSF of AD patients contain miRNAs, which are capable of activating hTLR8 and inducing an inflammatory response from microglia.
Key findings
- Using a HEK TLR reporter cell system, we found that these miRNA are potent activators of human TLR8, an established RNA sensor.
- Taken together, putatively microglia-derived EVs from the CSF of AD patients contain miRNAs, which are capable of activating hTLR8 and inducing an inflammatory response from microglia.
Why it matters
Microglia-derived extracellular vesicles from the cerebrospinal fluid of Alzheimer's patients carried microRNAs that activated the RNA sensor TLR8 and triggered inflammatory responses from microglia in laboratory experiments. This is early cellular research and does not show that targeting these vesicles would treat or prevent Alzheimer's disease.
Study details
- Evidence strengthLow
How this study scored 43/100
Published in a peer-reviewed journal. Scored zero for study design, sample size, effect reported, studied in people and randomised / blinded because the record does not state it.
| Component | Points | Why |
|---|---|---|
| Journal tier | 7 / 10 | Tier 3 — peer-reviewed journal (Molecular Neurobiology) |
| Journal's citation record | 2 / 4 | Molecular Neurobiology: journal h-index 176 (OpenAlex, 2026-10-29) |
| Study design | 0 / 12 | No study design recorded — scores zero, not guessed (not stated in the record — scored 0) |
| Strength of evidence | 1 / 5 | Rated “low” in our summary |
| Peer-review validation | 10 / 10 | Peer-reviewed. Published as an article in a named peer-reviewed journal. |
| How recent | 5 / 5 | 2026 — within 1 year(s) of the newest study here |
| Sample size | 0 / 4 | Participant count not stated — scores zero (not stated in the record — scored 0) |
| Effect reported | 0 / 3 | No effect size reported — scores zero (not stated in the record — scored 0) |
| Studied in people | 0 / 3 | Not stated whether this was studied in people — scores zero (not stated in the record — scored 0) |
| Randomised / blinded | 0 / 2 | No randomisation or blinding stated — scores zero (not stated in the record — scored 0) |
| Times cited | 2 / 7 | Cited 10 times (OpenAlex, 2026-10-10) |
| Citations per year | 2 / 5 | 5.0 citations a year over 2 year(s) since 2026 |
| Impact for its field and year | 4 / 6 | Cited 19.4× the average for papers of its field and year (OpenAlex FWCI) |
| Cited by studies here | 0 / 6 | No other study in this library cites it |
| Still being cited | 1 / 4 | Cited 10 times in 2024–2026 (2026 still in progress; OpenAlex) |
| Senior author's track record | 2 / 4 | Last-listed author Seija Lehnardt: h-index 32 (OpenAlex, whole career) |
| Institution's track record | 1 / 3 | Charité - Universitätsmedizin Berlin: institution h-index 1,116 (OpenAlex) |
| Multi-centre collaboration | 2 / 3 | OpenAlex lists 8 institution(s) in 2 countries |
| Indexed in PubMed | 2 / 2 | Indexed in PubMed (PMID 41678018) |
| Free to read | 2 / 2 | Free to read |
| Total | 43 / 100 | — |
What each of these 20 components measures, and what this score is not →
Read the original
- DOI: 10.1007/s12035-026-05719-w
- PubMed: 41678018
- Original source →
- Free full text: Molecular Neurobiology →
Full text: free to read — OpenAlex lists this copy as free to read: the link above (checked 6 Feb 1020).
Cite this study APA, Vancouver, BibTeX · download .bib or .ris
Built from the record alzhub holds for this paper, not looked up. Volume, issue and page numbers are not held in the record. The record's author list ends in “et al.”, so not every author is named. Check the citation against the original before you use it.
APA 7th
Arbaciauskaite, S., Silvestri, S., Luo, P., Krüger, C., Mossmann, Z. J., Allelein, S., et al. (2026). Microglia-Derived Extracellular Vesicles from Alzheimer’s Disease Patients Carry miRNAs Driving a Neuroinflammatory Response. Molecular Neurobiology. https://doi.org/10.1007/s12035-026-05719-w
Vancouver
Arbaciauskaite S, Silvestri S, Luo P, Krüger C, Mossmann ZJ, Allelein S, et al. Microglia-Derived Extracellular Vesicles from Alzheimer’s Disease Patients Carry miRNAs Driving a Neuroinflammatory Response. Molecular Neurobiology. 2026. doi:10.1007/s12035-026-05719-w. PMID: 41678018.
BibTeX
@article{arbaciauskaite2026-41678018,
author = {Arbaciauskaite, Skaiste and Silvestri, Simona and Luo, Pingyan and Krüger, Christina and Mossmann, Zoé J. and Allelein, Susann and Scholz, Alexander and Löffler, Dennis and others},
title = {{Microglia-Derived Extracellular Vesicles from Alzheimer’s Disease Patients Carry miRNAs Driving a Neuroinflammatory Response}},
journal = {Molecular Neurobiology},
year = {2026},
doi = {10.1007/s12035-026-05719-w},
pmid = {41678018},
url = {https://doi.org/10.1007/s12035-026-05719-w}
}
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