Morphological aspects of superoxide dismutase-1 mutation in amyotrophic lateral sclerosis and its transgenic mouse model

Noriyuki Shibata, Makio Kobayashi, Asao Hirano, Kohtaro Asayama, Seiko Horiuchi, Mauro C. Dal Canto, Mark E. Gurney

Research output: Contribution to journalArticle

6 Scopus citations

Abstract

Amyotrophic lateral sclerosis (ALS) is a progressive neurodegenerative disease that primarily involves the motor neuron system. Recent investigations have obtained evidence that mutations in the gene for superoxide dismutase-1 (SOD1) are detected in a subset of familial ALS patients, and that mutant SOD 1-expressing transgenic mice develop ALS-like clinicopathological features. Several in vitro studies suggest that SOD 1-mutated ALS is caused by a newly acquired neurotoxicity of mutant SOD 1, but not by reduced enzyme activity. From the viewpoint of morphology, we analyzed the immunolocalization of SOD1 and some other substances in spinal cords from familial ALS patients with SOD1 Ala4→Val mutation. The spinal cords of the ALS patients demonstrated the characteristic neuronal hyaline inclusions (NHIs) immunoreactive with antibodies to ubiquitin and phosphorylated neurofilament protein (NFP) in the lower motor neurons and cordlike swollen axons. The NHIs contained the epitopes of SOD1 and Nε-carboxymethyllysine (CML), one of the major advanced glycation endproducts (AGE), whereas there was no focal accumulation of SOD1 and CML in control individuals. Immunoelectron microscopy depicted the SOD1 and CML determinants on the granule-associated thick linear structures that mainly compose the NHIs. We also performed a similar study on mice carrying a transgene for Gly93→Ala mutant SOD1. The spinal cords of the transgenic mice were characterized by the appearance of NHIs resembling those of familial ALS and by vacuolar degeneration. The mouse NHIs were immunoreactive for ubiquitin, phophorylated NFP, SOD1 and CML. Our findings of the coexistence of SOD1 and AGE in both the human and mouse NHIs indicate that certain substances are implicated in glycoxidation in the presence of oxidative stress originating from mutant SOD1 and finally deposited in the NHIs, suggesting a pathogenic role of the oxidative processes in motor neuron degeneration in vivo.

Original languageEnglish (US)
Pages (from-to)17-30
Number of pages14
JournalActa Histochemica et Cytochemica
Volume32
Issue number1
DOIs
StatePublished - Jan 1 1999

    Fingerprint

Keywords

  • Advanced glycation endproducts
  • Amyotrophic lateral sclerosis
  • Hyaline inclusions
  • Immunohistochemistry
  • Superoxide dismutase
  • Transgenic mouse model

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Biochemistry
  • Physiology
  • Histology
  • Cell Biology

Cite this

Shibata, N., Kobayashi, M., Hirano, A., Asayama, K., Horiuchi, S., Dal Canto, M. C., & Gurney, M. E. (1999). Morphological aspects of superoxide dismutase-1 mutation in amyotrophic lateral sclerosis and its transgenic mouse model. Acta Histochemica et Cytochemica, 32(1), 17-30. https://doi.org/10.1267/ahc.32.17