Cited by 8Neuroinflammation and Neurodegeneration MechanismsMicroRNA in disease regulationExtracellular vesicles in disease

Neurodegenerative disease-associated microRNAs acting as signaling molecules modulate CNS neuron structure and viability

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Kumbol, Victor, Ivanov, Andranik, McGurran, Hugo, Schüler, Jutta, Zhai, Yuanyuan, Ludwik, Katarzyna, Hinkelmann, Lukas, Brehm, Mariam +7 more·2025·Cell Communication and Signaling

Abstract

Background: Dysregulation of microRNA (miRNA) expression in the brain is a common feature of neurodegenerative diseases. Beyond their conventional role in regulating gene expression at the post-transcriptional level, certain miRNAs can act extracellularly as signaling molecules. Our study elucidates the identity of such miRNA species serving as ligands for membrane receptors expressed in central nervous system (CNS) neurons and the impact of such miRNAs on neurons in the context of neurodegenerative disease. Methods: We combined a machine learning approach with the analysis of disease-associated miRNA databases to predict Alzheimer’s disease (AD)-associated miRNAs as potential signaling molecules for single-stranded RNA-sensing Toll-like receptors (TLRs) 7 and 8. TLR-expressing HEK-Blue reporter cells, primary murine microglia, and human THP-1 macrophages were used to validate the AD miRNAs as ligands for human and mouse TLR7 and/or TLR8. Interaction between mouse cortical neurons and extracellularly applied AD miRNAs was analyzed by live cell imaging and confocal microscopy. Transcriptome changes in cortical neurons exposed to AD miRNAs were assessed by RNAseq and RT-qPCR. The extracellular AD miRNAs’ effects on CNS neuron structure were investigated in cell cultures of murine primary cortical neurons and iPSC-derived human cortical neurons by immunocytochemistry. We employed a mouse model of intrathecal injection to assess effects of AD miRNAs acting as signaling molecules on neurons in vivo. Results: We identified the AD-associated miRNAs miR-124-5p, miR-92a-1-5p, miR-9-5p, and miR-501-3p as novel endogenous ligands for TLR7 and/or TLR8. These miRNAs being extracellularly stable and active were taken up by murine cortical neurons via endocytosis and induced changes in neuronal inflammation-, proliferation-, and apoptosis-related gene expression. Exposure of both murine and human cortical neurons to the AD-associated miRNAs led to alterations of dendrite and axon structure, synapse protein expression, and cell viability in a sequence-dependent fashion. Extracellular introduction of the AD miRNAs into the cerebrospinal fluid of mice resulted in both changes in neuronal structure and synapses, and neuronal loss in the cerebral cortex. Most of the observed extracellular miRNA-induced effects on cortical neurons involved TLR7/8 signaling. Conclusion: Neurodegenerative disease-associated miRNAs in extracellular form act as signaling molecules for CNS neurons including human cortical neurons, thereby modulating their structure and viability.

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  • Cites a retracted work: 10.18632/oncotarget.23119

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    The cited work was retracted on 2025-12-31 (notice 10.18632/oncotarget.28815), not before this paper was published (2025-04-24).

    Cited work 10.18632/oncotarget.23119 · retracted 2025-12-31 · notice 10.18632/oncotarget.28815 · this paper published 2025-04-24

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Authors
Kumbol, V., Ivanov, A., McGurran, H., Schüler, J., Zhai, Y., Ludwik, K., Hinkelmann, L., Brehm, M., Krüger, C., Küchler, J., Wallach, T., Höltje, M., Beule, D., Stachelscheid, H., & Lehnardt, S.
Affiliations
  • Humboldt-Universität zu Berlin (DE)
  • Berlin Institute of Health at Charité - Universitätsmedizin Berlin (DE)
Corresponding author
Lehnardt, Seija
Venue
Cell Communication and Signaling
Published
2025-04-24
Volume
23
Issue
1
Pages
196-196
ISSN
1478-811X (ISSN-L)
OpenAlex
W4409738281
Cited by
8
References
88
Citations by year
2026: 6 · 2025: 2
FWCI
2.97
Type
journal article
Language
en
Open access
Locations
  • Cell Communication and Signaling (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
Charité - Universitätsmedizin Berlin
Topics
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › MicroRNA in disease regulation
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Extracellular vesicles in disease
Keywords
TLR7, TLR8, Alzheimer's disease, neurodegenerative diseases, cortical neurons, synaptic proteins, neuronal viability, neuronal apoptosis, neuronal inflammation, miR-9-5p, miR-501-3p, microglia, cerebrospinal fluid, iPSC-derived neurons, intrathecal administration
MeSH terms
Alzheimer Disease, Animals, Cell Survival, Central Nervous System, Humans, Neurons, Signal Transduction, Microglia, Neurodegenerative Diseases, MicroRNAs, Toll-Like Receptor 7, Toll-Like Receptor 8, Mice, HEK293 Cells

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