Cited by 353Amyotrophic Lateral Sclerosis ResearchNeuroinflammation and Neurodegeneration MechanismsMultiple Sclerosis Research Studies

Microglia in ALS: The Good, The Bad, and The Resting

Henkel, Jenny S., Beers, David R., Zhao, Weihua, Appel, Stanley H.·2009·Journal of Neuroimmune Pharmacology

Abstract

Inflammation, including microglial activation and T cell infiltration, is a neuropathological hallmark of amyotrophic lateral sclerosis (ALS), a rapidly progressing neurodegenerative disease. The identification of mutations in the gene for Cu2+/Zn2+ superoxide dismutase (SOD1) from patients with an inherited form of ALS enabled the creation of transgenic mice overexpressing mutant forms of SOD1 (mSOD1) which develop a motoneuron disease that resembles the disease seen in ALS patients. These transgenic mice display similar inflammatory reactions at sites of motoneuron injury as detected in ALS patients, enabling the observation that this inflammation is not simply a late consequence of motoneuron degeneration, but actively contributes to the balance between neuroprotection and neurotoxicity. The microglial and T cell activation states influence the rate of disease progression. Initially, microglia and T cells can slow disease progression, while they may later contribute to the acceleration of disease. Accumulation of intracellular and extracellular misfolded mSOD1 may be key events regulating the transformation from neuroprotective alternatively activated M2 microglia to cytotoxic classically activated M1 microglia. Intracellular and extracellular mSOD1 utilizing different pathways may enhance the production and release of reactive oxygen species (ROS) and augment the inflammatory cytokine cascade from microglia. These ROS and cytokines may increase the susceptibility of motoneurons to glutamate toxicity and inhibit the function and expression of astrocytic glutamate transporters resulting in further neurotoxicity. Thus, the cumulative evidence suggests that inflammation plays a central role in ALS and manipulating these microglial effector functions may potentially modify the outcome of this devastating disease.

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Crossref · 10.1007/s11481-009-9171-5

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  • In pre-symptomatic mutant SOD1 transgenic mice, activated microglia initially display neuroprotective properties that slow disease progression.

    “In pre-symptomatic mutant SOD1 transgenic mice, activated microglia initially display neuroprotective properties that slow disease progression;”
  • In mutant SOD1 transgenic mice, continued unabridged neuroinflammation enhances neurodegeneration and accelerates disease progression.

    “however, with time the continued and unabridged neuroinflammation only enhances neurodegeneration and accelerates disease progression [434–436].”

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Authors
Henkel, J. S., Beers, D. R., Zhao, W., & Appel, S. H.
Affiliations
Houston Methodist (US)
Venue
Journal of Neuroimmune Pharmacology
Published
2009-09-03
Volume
4
Issue
4
Pages
389-398
ISSN
  • 1557-1890 (ISSN-L)
  • 1557-1904
OpenAlex
W1970433280
Cited by
353
References
101
Citations by year
2026: 5 · 2025: 10 · 2024: 15 · 2023: 13 · 2022: 21 · 2021: 21 · 2020: 16 · 2019: 17 · 2018: 19 · 2017: 23 · 2016: 28 · 2015: 27 · 2014: 29 · 2013: 30 · 2012: 41
FWCI
2.92
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neuroimmune Pharmacology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Muscular Dystrophy Association
  • National Institutes of Health
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
amyotrophic lateral sclerosis, microglia, neuroinflammation, SOD1 mutations, transgenic mice, motor neuron degeneration, M1/M2 microglial polarization, reactive oxygen species, cytokines, glutamate excitotoxicity, T cell infiltration
MeSH terms
Amyotrophic Lateral Sclerosis, Animals, Humans, Motor Neurons, Signal Transduction, Resting Phase, Cell Cycle, Microglia, Disease Progression

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