Cited by 358Amyotrophic Lateral Sclerosis ResearchNeuroinflammation and Neurodegeneration MechanismsMultiple Sclerosis Research Studies

Targeting mi R‐155 restores abnormal microglia and attenuates disease in SOD 1 mice

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Butovsky, Oleg, Jedrychowski, Mark P., Cialic, Ron, Krasemann, Susanne, Murugaiyan, Gopal, Fanek, Zain, Greco, David J., Wu, Pauline M. +12 more·2015·Annals of Neurology

Abstract

Objective: To investigate miR‐155 in the SOD1 mouse model and human sporadic and familial amyotrophic lateral sclerosis (ALS). Methods: NanoString microRNA, microglia and immune gene profiles, protein mass spectrometry, and RNA‐seq analyses were measured in spinal cord microglia, splenic monocytes, and spinal cord tissue from SOD1 mice and in spinal cord tissue of familial and sporadic ALS. miR‐155 was targeted by genetic ablation or by peripheral or centrally administered anti–miR‐155 inhibitor in SOD1 mice. Results: In SOD1 mice, we found loss of the molecular signature that characterizes homeostatic microglia and increased expression of miR‐155. There was loss of the microglial molecules P2ry12, Tmem119, Olfml3, transcription factors Egr1, Atf3, Jun, Fos, and Mafb, and the upstream regulators Csf1r, Tgfb1, and Tgfbr1, which are essential for microglial survival. Microglia biological functions were suppressed including phagocytosis. Genetic ablation of miR‐155 increased survival in SOD1 mice by 51 days in females and 27 days in males and restored the abnormal microglia and monocyte molecular signatures. Disease severity in SOD1 males was associated with early upregulation of inflammatory genes, including Apoe in microglia. Treatment of adult microglia with apolipoprotein E suppressed the M0‐homeostatic unique microglia signature and induced an M1‐like phenotype. miR‐155 expression was increased in the spinal cord of both familial and sporadic ALS. Dysregulated proteins that we identified in human ALS spinal cord were restored in SOD1 G93A/miR‐155−/− mice. Intraventricular anti–miR‐155 treatment derepressed microglial miR‐155 targeted genes, and peripheral anti–miR‐155 treatment prolonged survival. Interpretation: We found overexpression of miR‐155 in the SOD1 mouse and in both sporadic and familial human ALS. Targeting miR‐155 in SOD1 mice restores dysfunctional microglia and ameliorates disease. These findings identify miR‐155 as a therapeutic target for the treatment of ALS. ANN NEUROL 2015;77:75–99

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  • Peripheral administration of anti-miR155 in SOD1 mice reversed this abnormal phenotype of microglia and ameliorated the disease.

    “It has been reported that peripheral administration of anti-miR155 in SOD1 mice reversed this abnormal phenotype of microglia and ameliorated the disease [6].”

    From Loss of homeostatic microglial phenotype in CSF1R-related Leukoencephalopathy (2020) · cites this paper as [6]

    The Results report that peripheral anti-miR-155 improved performance and prolonged survival in SOD1 mice. But the same section explicitly says peripheral treatment had no effect on the pro-inflammatory microglial profile; it reversed the inflammatory profile of peripheral monocytes instead. (LLM, conf=0.90)

    Experimental — accuracy not yet measured
  • Loss of the M0-homeostatic microglial signature in animal models of amyotrophic lateral sclerosis (ALS) is associated with up-regulation of inflammatory genes, which correlates with disease severity.

    “Loss of the M0-homeostatic microglial signature in animal models of amyotrophic lateral sclerosis (ALS) is associated with up-regulation of inflammatory genes, which correlates with disease severity [6].”

    From Loss of homeostatic microglial phenotype in CSF1R-related Leukoencephalopathy (2020) · cites this paper as [6]

    The Results section on the microglial signature reports loss of M0-associated genes alongside up-regulation of inflammatory genes in SOD1 mice. A separate Results section links stronger inflammatory-gene activation to greater disease severity in male than female SOD1 mice. The claim omits that the severity comparison is sex-specific and presents findings from one SOD1 model as applying to animal models more broadly; page numbers are unavailable in our copy. (LLM, conf=0.82)

    Experimental — accuracy not yet measured
  • In ALS mice, germ-line knock-out of miR-155 altered microglia polarization in vivo.

    “In ALS (B6/SJL-SOD1G93A transgenic) mice it has been shown that germ-line knock-out of miR-155 altered microglia polarization in vivo [46].”

    From Microglia specific deletion of miR-155 in Alzheimer’s disease mouse models reduces amyloid-β pathology but causes hyperexcitability and seizures (2023) · cites this paper as [46]

    The Results section (page unavailable) reports that genetic deletion of miR-155 in SOD1G93A mice reduced pro-inflammatory gene expression in spinal microglia and restored M1 and M0 marker patterns in vivo. However, the Animals section says the knockout mice were produced by crossing B6-congenic SOD1G93A mice with miR-155-deficient mice; it does not identify the knockout cohort as B6/SJL-SOD1G93A mice. (LLM, conf=0.88)

    Experimental — accuracy not yet measured
  • In SOD1 mice (ALS model), increased miR-155 with downregulation of P2ry12, Tmem119, Olfml3, Egr1, Atf3, Jun, Fos, Mafb, Csf1r, Tgfb1, and Tgfbr1 results in suppressed phagocytosis.

    “Increased expression of miR-155, with concomitant downregulation of numerous genes, namely P2ry12, Tmem119, Olfml3, Egr1, Atf3, Jun, Fos, Mafb, Csf1r, Tgfb1 and Tgfbr1, which resulted in suppressed phagocytosis, was also found in SOD1 mice, a murine model of amyotrophic lateral sclerosis.”

    From MicroRNAs as Regulators of Phagocytosis (2022) · cites this paper as [238]

    The Results report increased miR-155, loss of the listed microglial genes, and impaired phagocytosis in SOD1 mice. They also report that deleting miR-155 restores phagocytic ability. The passages do not establish that downregulation of the listed genes caused the impaired phagocytosis, as the citing sentence implies; page numbers were not provided in our copy. (LLM, conf=0.83)

    Experimental — accuracy not yet measured
  • miR-155 is upregulated in the spinal cords of end-stage ALS model SOD1G93A mice and human autopsy.

    “Work from our lab and others found that miR-155, a glialenriched miRNA, is upregulated in the spinal cords of end-stage ALS model (SOD1 G93A ) mice and human autopsy (Koval et al., 2013;Butovsky et al., 2015).”

    From MicroRNA Profiling Reveals Marker of Motor Neuron Disease in ALS Models (2017) · cites this paper as Butovsky et al., 2015

    The Discussion (page unavailable) says miR-155 was the most upregulated miRNA in microglia and spinal cord tissue of SOD1G93A mice and ALS subjects. The Results report increased miR-155 in human ALS spinal-cord specimens, and the Methods identify those specimens as post-mortem. The passages do not establish that the reported miR-155 increase in mice was specifically measured at end-stage. (LLM, conf=0.82)

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Authors
Butovsky, O., Jedrychowski, M. P., Cialic, R., Krasemann, S., Murugaiyan, G., Fanek, Z., Greco, D. J., Wu, P. M., Doykan, C. E., Kiner, O., Lawson, R. J., Frosch, M. P., Pochet, N., Fatimy, R. E., Krichevsky, A. M., Gygi, S. P., Lassmann, H., Berry, J., Cudkowicz, M. E., & Weiner, H. L.
Affiliations
  • Brigham and Women's Hospital (US)
  • Harvard University (US)
  • University Medical Center Hamburg-Eppendorf (DE)
  • Broad Institute (US)
  • Medical University of Vienna (AT)
Corresponding author
Butovsky, Oleg
Venue
Annals of Neurology
Publisher
Wiley
Published
2014-11-27
Volume
77
Issue
1
Pages
75-99
ISSN
  • 0364-5134 (ISSN-L)
  • 1531-8249
OpenAlex
W1545421865
Cited by
358
References
63
Citations by year
2026: 10 · 2025: 22 · 2024: 33 · 2023: 31 · 2022: 46 · 2021: 32 · 2020: 33 · 2019: 29 · 2018: 41 · 2017: 35 · 2016: 26 · 2015: 20
FWCI
17.60
Type
journal article
Language
en
Open access
Locations
  • Annals of Neurology (publishedVersion)
  • PubMed (publishedVersion)
  • Europe PMC (PubMed Central) (acceptedVersion)
  • PubMed Central (acceptedVersion)
Funders
  • National Institutes of Health (NS088137)
  • U.S. Department of Defense (AL120029)
  • Amyotrophic Lateral Sclerosis Association (IV78RI, ALSA2087)
  • National Multiple Sclerosis Society
  • The Nancy Davis Foundation for Multiple Sclerosis
  • Edward N. & Della L. Thome Memorial Foundation
Topics
  • Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
  • Health Sciences › Medicine › Pathology and Forensic Medicine › Multiple Sclerosis Research Studies
Keywords
miR-155, amyotrophic lateral sclerosis, microglia, microglial homeostasis, apolipoprotein E, microglial phagocytosis, microglial survival, therapeutic target, familial ALS, sporadic ALS
MeSH terms
Aged, Amyotrophic Lateral Sclerosis, Animals, Apolipoproteins E, Cells, Cultured, Disease Models, Animal, Female, Gene Expression Regulation, Hippocampus, Humans, Male, Mice, Transgenic, Middle Aged, Monocytes, Neurons, Phagocytosis, Spinal Cord, Superoxide Dismutase, Transforming Growth Factor beta, Microglia, Oligoribonucleotides, Antisense, MicroRNAs, Mice

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