The mitochondrial calcium regulator cyclophilin D is an essential component of oestrogen-mediated neuroprotection in amyotrophic lateral sclerosis. Academic Article uri icon

Overview

MeSH

  • Animals
  • Brain
  • Membrane Potential, Mitochondrial
  • Mice
  • Mice, Knockout
  • Mitochondria
  • Phenotype
  • Spinal Cord
  • Superoxide Dismutase
  • Superoxide Dismutase-1

MeSH Major

  • Amyotrophic Lateral Sclerosis
  • Calcium
  • Cyclophilins
  • Estradiol
  • Neurons
  • Neuroprotective Agents

abstract

  • Amyotrophic lateral sclerosis is a devastating neurodegenerative disorder that is more prevalent in males than in females. A similar gender difference has been reported in some strains of transgenic mouse models of familial amyotrophic lateral sclerosis harbouring the G93A mutation in CuZn superoxide dismutase. Mitochondrial damage caused by pathological alterations in Ca(2+) accumulation is frequently involved in neurodegenerative diseases, including CuZn superoxide dismutase-related amyotrophic lateral sclerosis, but its association with gender is not firmly established. In this study, we examined the effects of genetic ablation of cyclophilin D on gender differences in mice expressing G93A mutant CuZn superoxide dismutase. Cyclophilin D is a mitochondrial protein that promotes mitochondrial damage from accumulated Ca(2+). As anticipated, we found that cyclophilin D ablation markedly increased Ca(2+) retention in brain mitochondria of both males and females. Surprisingly, cyclophilin D ablation completely abolished the phenotypic advantage of G93A females, with no effect on disease in males. We also found that the 17β-oestradiol decreased Ca(2+) retention in brain mitochondria, and that cyclophilin D ablation abolished this effect. Furthermore, 17β-oestradiol protected G93A cortical neurons and spinal cord motor neurons against glutamate toxicity, but the protection was lost in neurons lacking cyclophilin D. Taken together, these results identify a novel mechanism of oestrogen-mediated neuroprotection in CuZn superoxide dismutase-related amyotrophic lateral sclerosis, whereby Ca(2+) overload and mitochondrial damage are prevented in a cyclophilin D-dependent manner. Such a protective mechanism may contribute to the lower incidence and later onset of amyotrophic lateral sclerosis, and perhaps other chronic neurodegenerative diseases, in females.

publication date

  • September 2012

has subject area

  • Amyotrophic Lateral Sclerosis
  • Animals
  • Brain
  • Calcium
  • Cyclophilins
  • Estradiol
  • Membrane Potential, Mitochondrial
  • Mice
  • Mice, Knockout
  • Mitochondria
  • Neurons
  • Neuroprotective Agents
  • Phenotype
  • Spinal Cord
  • Superoxide Dismutase
  • Superoxide Dismutase-1

Research

keywords

  • Journal Article

Identity

Language

  • eng

PubMed Central ID

  • PMC3437032

Digital Object Identifier (DOI)

  • 10.1093/brain/aws208

PubMed ID

  • 22961554

Additional Document Info

start page

  • 2865

end page

  • 2874

volume

  • 135

number

  • Pt 9