Mitochondrial alterations in transgenic mice with an H46R mutant Cu/Zn superoxide dismutase gene

Shoichi Sasaki, Masashi Aoki, Makiko Nagai, Makio Kobayashi, Yasuto Itoyama

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

We examined morphological alterations in the mitochondria in the spinal cord of H46R mutant Cu/Zn superoxide dismutase transgenic mice; these mice serve as a model for human familial amyotrophic lateral sclerosis. The disease in the mice is characterized by initial muscle weakness and atrophy in the legs, very long clinical courses, and widespread pathological changes of the spinal cord that extend beyond the motor system and includes many neuropil aggregates that lack vacuoles. At the preclinical stage, we found alterations in the mitochondrial cristae that included focal electron-dense changes, whorled membranous and electron-dense amorphous structures, and outward projections of outer and inner membranes predominantly in proximal axons. At the overt disease stage, these mitochondrial alterations were more frequent and were also found in somata, dendrites, presynaptic terminals, and astrocyte cytoplasm. By immunoelectron microscopy, no accumulations of Cu/Zn superoxide dismutase- or ubiquitin-positive immunogold particles were observed in either normal-appearing or abnormal mitochondria. These findings suggest that predominant mitochondrial alterations in the proximal axons begin in the preclinical stage and may be involved in the pathogenetic mechanisms of motor neuron degeneration in these transgenic mice via disruption of the axonal transport of substrates necessary for neuronal viability; this disruption may lead to motor neuron death.

Original languageEnglish
Pages (from-to)365-373
Number of pages9
JournalJournal of Neuropathology and Experimental Neurology
Volume68
Issue number4
DOIs
Publication statusPublished - 2009 Apr

Keywords

  • Aggregates
  • Amyotrophic lateral sclerosis
  • Astrocytes
  • H46R
  • Mitochondria
  • SOD1
  • Transgenic mice

ASJC Scopus subject areas

  • Pathology and Forensic Medicine
  • Neurology
  • Clinical Neurology
  • Cellular and Molecular Neuroscience

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