Arginase-1 expressing microglia in close proximity to motor neurons were increased early in disease progression in canine degenerative myelopathy, a model of amyotrophic lateral sclerosis

Christine Toedebusch, John C. Snyder, Maria R. Jones, Virginia B. Garcia, Gayle C. Johnson, Eric L. Villalón, Joan R. Coates, Michael L. Garcia

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

Toxicity within superoxide dismutase-1 (SOD1)-associated familial amyotrophic lateral sclerosis (ALS) is non-cell autonomous with direct contribution from microglia. Microglia exhibit variable expression of neuroprotective and neurotoxic molecules throughout disease progression. The mechanisms regulating microglial phenotype within ALS are not well understood. This work presents a first study to examine the specific microglial phenotypic response in close association to motor neurons in a naturally occurring disease model of ALS, canine degenerative myelopathy (DM). Microglia closely associated with motor neurons were increased in all stages of DM progression, although only DM Late reached statistical significance. Furthermore, the number of arginase-1 expressing microglia per motor neuron were significantly increased in early stages of DM, whereas the number of inducible nitric oxide synthase (iNOS)-expressing microglia per motor neuron was indistinguishable from aged controls at all stages of disease. Fractalkine, a chemotactic molecule for microglia, was expressed in motor neurons, and the fractalkine receptor was specifically localized to microglia. However, we found no correlation between microglial response and lumbar spinal cord fractalkine levels. Taken together, these data suggest that arginase-1-expressing microglia are recruited to the motor neuron early in DM disease through a fractalkine-independent mechanism.

Original languageEnglish (US)
Pages (from-to)148-157
Number of pages10
JournalMolecular and Cellular Neuroscience
Volume88
DOIs
StatePublished - Apr 1 2018
Externally publishedYes

Fingerprint

Arginase
Spinal Cord Diseases
Amyotrophic Lateral Sclerosis
Microglia
Motor Neurons
Disease Progression
Canidae
Chemokine CX3CL1
Spinal Cord
Nitric Oxide Synthase Type II
Phenotype

Keywords

  • ALS
  • Degenerative myelopathy
  • Fractalkine
  • Microglia
  • Motor neuron
  • Neurodegenerative disease

ASJC Scopus subject areas

  • Molecular Biology
  • Cellular and Molecular Neuroscience
  • Cell Biology

Cite this

Arginase-1 expressing microglia in close proximity to motor neurons were increased early in disease progression in canine degenerative myelopathy, a model of amyotrophic lateral sclerosis. / Toedebusch, Christine; Snyder, John C.; Jones, Maria R.; Garcia, Virginia B.; Johnson, Gayle C.; Villalón, Eric L.; Coates, Joan R.; Garcia, Michael L.

In: Molecular and Cellular Neuroscience, Vol. 88, 01.04.2018, p. 148-157.

Research output: Contribution to journalArticle

Toedebusch, Christine ; Snyder, John C. ; Jones, Maria R. ; Garcia, Virginia B. ; Johnson, Gayle C. ; Villalón, Eric L. ; Coates, Joan R. ; Garcia, Michael L. / Arginase-1 expressing microglia in close proximity to motor neurons were increased early in disease progression in canine degenerative myelopathy, a model of amyotrophic lateral sclerosis. In: Molecular and Cellular Neuroscience. 2018 ; Vol. 88. pp. 148-157.
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