Cited by 424Amyotrophic Lateral Sclerosis ResearchAlzheimer's disease research and treatmentsHereditary Neurological Disorders

Accumulation of SOD1 Mutants in Postnatal Motoneurons Does Not Cause Motoneuron Pathology or Motoneuron Disease

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Lino, Maria Maddalena, Schneider, Corinna, Caroni, Pico·2002·The Journal of Neuroscience

Abstract

Transgenic mice expressing high levels of familial amyotrophic lateral sclerosis (FALS)-associated mutant superoxide dismutase 1 (SOD1) under the control of a human SOD1 minigene (hMg) accumulate mutant protein ubiquitously and develop motoneuron disease. However, restricted expression of SOD1 mutants in neurons apparently does not cause motor impairments in mice. Here, we investigated the possible pathogenic roles of mutant SOD1 accumulation in motoneurons. First, we used a Thy1 expression cassette to drive high constitutive expression of transgene in postnatal mouse neurons, including upper and lower motoneurons. Second, we expressed human (h) SOD1(G93A) and hSOD1(G85R) as transgenes (i.e., two SOD1 mutants with aggressive pathogenic properties in inducing FALS). Third, in addition to clinical signs of disease, we monitored early signs of disease onset and pathogenesis, including muscle innervation, astrogliosis in the spinal cord, and accumulation of ubiquitinated deposits in motoneurons and astrocytes. We report that high-level expression and accumulation of the mutant proteins in neurons failed to produce any detectable sign of pathology or disease in these transgenic mice. Crossing hMg-SOD1(G93A) mice (Gurney et al., 1994) with Thy1-SOD1(G93A) mice produced double-transgenic mice with spinal cord SOD1(G93A) levels that were approximately twofold higher than in the hMg-SOD1(G93A) single transgenics but did not affect the onset or progression of pathology or motoneuron disease. The accumulation of mutant SOD1 in postnatal motoneurons is thus not sufficient and probably also not critical to induce or accelerate motoneuron disease in FALS mice. The pathogenic process in FALS may involve non-neuronal cells, and selective vulnerability of motoneurons to this process may lead to motoneuron pathology and disease.

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Authors
Lino, M. M., Schneider, C., & Caroni, P.
Affiliations
Friedrich Miescher Institute (CH)
Venue
The Journal of Neuroscience
Published
2002-06-15
Volume
22
Issue
12
Pages
4825-4832
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2110289399
Cited by
424
References
35
Citations by year
2026: 2 · 2025: 3 · 2024: 9 · 2023: 14 · 2022: 10 · 2021: 10 · 2020: 10 · 2019: 15 · 2018: 15 · 2017: 13 · 2016: 13 · 2015: 14 · 2014: 17 · 2013: 24 · 2012: 17
FWCI
18.61
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Neurology › Amyotrophic Lateral Sclerosis Research
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Hereditary Neurological Disorders
Keywords
amyotrophic lateral sclerosis, SOD1 mutations, superoxide dismutase 1, motor neurons, transgenic mice, SOD1 G93A, double transgenic mice, astrocyte activation, pathogenesis, neuronal vulnerability
MeSH terms
Superoxide Dismutase-1, Amyotrophic Lateral Sclerosis, Animals, Animals, Newborn, Kinetics, Mice, Transgenic, Models, Neurological, Motor Neurons, Mutation, Superoxide Dismutase, Disease Progression, Thy-1 Antigens, Mice

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