Cited by 247Extracellular vesicles in diseaseTraumatic Brain Injury and Neurovascular DisturbancesNeuroinflammation and Neurodegeneration Mechanisms

Increased Microglial Exosomal miR-124-3p Alleviates Neurodegeneration and Improves Cognitive Outcome after rmTBI

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Ge, Xintong, Guo, Mengtian, Hu, Tianpeng, Li, Wenzhu, Huang, Shan, Yin, Zhenyu, Li, Ying, Chen, Fanglian +5 more·2020·Molecular Therapy

Abstract

Repetitive mild traumatic brain injury (rmTBI) is considered to be an important risk factor for long-term neurodegenerative disorders such as Alzheimer's disease, which is characterized by β-amyloid abnormalities and impaired cognitive function. Microglial exosomes have been reported to be involved in the transportation, distribution, and clearance of β-amyloid in Alzheimer's disease. However, their impacts on the development of neurodegeneration after rmTBI are not yet known. The role of miRNAs in microglial exosomes on regulating post-traumatic neurodegeneration was investigated in the present study. We demonstrated that miR-124-3p level in microglial exosomes from injured brain was significantly altered in the acute, sub-acute, and chronic phases after rmTBI. In in vitro experiments, microglial exosomes with upregulated miR-124-3p (EXO-124) alleviated neurodegeneration in repetitive scratch-injured neurons. The effects were exerted by miR-124-3p targeting Rela, an inhibitory transcription factor of ApoE that promotes the β-amyloid proteolytic breakdown, thereby inhibiting β-amyloid abnormalities. In mice with rmTBI, the intravenously injected microglial exosomes were taken up by neurons in injured brain. Besides, miR-124-3p in the exosomes was transferred into hippocampal neurons and alleviated neurodegeneration by targeting the Rela/ApoE signaling pathway. Consequently, EXO-124 treatments improved the cognitive outcome after rmTBI, suggesting a promising therapeutic strategy for future clinical translation.

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Crossref · 10.1016/j.ymthe.2019.11.017

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  • When administered intravenously, these exosomes inhibit neuronal inflammation and autophagy, enhance neurogenesis, and consequently improve neurological outcomes in mice.

    “When administered intravenously, these exosomes were found to inhibit neuronal inflammation and autophagy, enhance neurogenesis, and consequently improve neurological outcomes in mice [169].”

    From Extracellular vesicles as nanotheranostic platforms for targeted neurological disorder interventions (2024) · cites this paper as [169]

    The Methods section (page not provided) reports intravenous injection of microglial exosomes into rmTBI mice, and the Results section reports improved cognitive outcomes after EXO-124 treatment. The paper does not report that this treatment inhibited autophagy or enhanced neurogenesis. In the Discussion (page not provided), it proposes an anti-inflammatory effect for EXO-124 as an inference and attributes neurogenesis findings to studies of MSC-derived exosomes, not to its own treatment. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • miR-124 is abundantly present in sEVs derived from M2-microglia.

    “Ge et al. discovered that miR-124 is abundantly present in sEVs derived from M2-microglia.”

    From Extracellular vesicles as nanotheranostic platforms for targeted neurological disorder interventions (2024) · cites this paper as [169]

    The Results section, “Upregulated miR-124-3p in Microglia Promotes M2 Polarization In Vitro” (page unavailable), reports that miR-124-3p mimic transfection increased its level in microglial exosomes and increased the M2-to-M1 ratio of the cultured microglia. It does not establish that exosomes from M2 microglia naturally contain abundant miR-124. (LLM, conf=0.84)

    Experimental — accuracy not yet measured
  • miR-124-3p within these exosomes was transferred to hippocampal neurons, where it mitigated neurodegeneration by targeting the Rela/ApoE signaling pathway.

    “Notably, miR-124-3p within these exosomes was transferred to hippocampal neurons, where it mitigated neurodegeneration by targeting the Rela/ApoE signaling pathway.”
  • In mice models of repetitive mild TBI, these microglial exosomes were internalized by neurons in the injured brain.

    “Specifically, in mice models of repetitive mild TBI, these microglial exosomes were observed to be internalized by neurons in the injured brain.”

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Authors
Ge, X., Guo, M., Hu, T., Li, W., Huang, S., Yin, Z., Li, Y., Chen, F., Zhu, L., Kang, C., Jiang, R., Lei, P., & Zhang, J.
Affiliations
Tianjin Medical University General Hospital (CN)
Corresponding author
  • Jiang, Rongcai
  • Lei, Ping
  • Zhang, Jianning
Venue
Molecular Therapy
Publisher
Elsevier BV
Published
2020-02
Volume
28
Issue
2
Pages
503-522
ISSN
1525-0016 (ISSN-L)
OpenAlex
W2990551073
Cited by
242
References
67
Citations by year
2026: 26 · 2025: 50 · 2024: 40 · 2023: 42 · 2022: 37 · 2021: 34 · 2020: 13
FWCI
6.95
Type
journal article
Language
en
Open access
Locations
  • Molecular Therapy (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
Funders
  • National Natural Science Foundation of China (81501055, 81772060, 81720108015, 81671221)
  • Tianjin Municipal Science and Technology Commission Natural Fund Project (18JCQNJC81100)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Extracellular vesicles in disease
  • Health Sciences › Medicine › Neurology › Traumatic Brain Injury and Neurovascular Disturbances
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
repetitive mild traumatic brain injury, miR-124-3p, neurodegeneration, cognitive impairment, amyloid-beta, Alzheimer's disease, exosome therapy, hippocampal neurons, microglia
MeSH terms
Animals, Apolipoproteins E, Brain Concussion, Cognition, Disease Models, Animal, Male, Models, Biological, Neurons, Severity of Illness Index, Signal Transduction, Microglia, Computational Biology, Neurodegenerative Diseases, Gene Expression Profiling, RNA Interference, MicroRNAs, Mice, Transcription Factor RelA, Exosomes

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