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Inflammatory cytokines increase mitochondrial damage in motoneuronal cells expressing mutant SOD1

Alberto Ferri1, Monica Nencini, Mauro Cozzolino

  • 1Ist. di Neuroscienze del CNR, Sez. Psicobiologia e Psicofarmacologia, Rome, Italy. a.ferri@hsantalucia.it

Neurobiology of Disease
|September 16, 2008
PubMed

Insights

Glial inflammatory signals exacerbate motor neuron death in amyotrophic lateral sclerosis (ALS) by damaging mitochondria, particularly when mutant superoxide dismutase (mutSOD1) is present. This study reveals how non-neuronal cells contribute to ALS progression.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Molecular Biology

Background:

  • Amyotrophic lateral sclerosis (ALS) is a neurodegenerative disease characterized by motor neuron loss.
  • Mutant superoxide dismutase (mutSOD1) is a key genetic factor in ALS, with its toxicity linked to mitochondrial dysfunction.
  • Microglia-derived signals are implicated in ALS disease progression.

Purpose of the Study:

  • To investigate whether glial-derived inflammatory signals influence the neurotoxicity of mutSOD1.
  • To determine the specific effects of inflammatory cytokines on motor neurons expressing wild-type (wtSOD1) or mutant SOD1 (mutSOD1) and their mitochondria.

Main Methods:

  • Motor neuron cells overexpressing wtSOD1 or mutSOD1 were treated with inflammatory cytokines (tumor necrosis factor alpha and interferon gamma).
  • Mitochondrial association of SOD1, mitochondrial morphology and function, and glutathione redox state were assessed.
  • Cell death phenotypes were evaluated following cytokine treatment.

Main Results:

  • Combined treatment with tumor necrosis factor alpha and interferon gamma increased mitochondrial association of both wtSOD1 and mutSOD1.
  • These cytokines significantly impaired mitochondrial morphology and function exclusively in cells expressing mutSOD1.
  • Mitochondrial damage was associated with an oxidized glutathione state and evoked a cell death phenotype.

Conclusions:

  • Glial inflammatory signals contribute to motor neuron death in mutSOD1-linked ALS.
  • Inflammatory cytokines exacerbate mitochondrial damage in motor neurons expressing mutSOD1.
  • Targeting glial-inflammatory pathways may offer therapeutic strategies for ALS.

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