Mitochondrial-dependent manganese neurotoxicity in rat primary astrocyte cultures

Zhaoobao Yin, Judy L. Aschner, Ana Paula dos Santos, Michael Aschner

Research output: Contribution to journalArticle

87 Scopus citations

Abstract

Chronic exposure to excessive levels of Mn results in a movement disorder termed manganism, which resembles Parkinson's disease (PD). The pathogenic mechanisms underlying this disorder are not fully understood. Several lines of evidence implicate astrocytes as an early target of Mn neurotoxicity. In the present study, we investigated the effects of Mn on mitochondrial function. Primary astrocyte cultures were prepared from cerebral cortices of one-day-old Sprague-Dawley rats. We have examined the cellular toxicity of Mn and its effects on the phosphorylation of extracellular signal-regulated kinase (ERK) and activation of the precursor protein of caspase-3. The potentiometric dye, tetramethyl rhodamine ethyl ester (TMRE), was used to assess the effect of Mn on astrocytic mitochondrial inner membrane potential (ΔΨm). Our studies show that, in a concentration-dependent manner, Mn induces significant (p < 0.05) activation of astrocyte caspase-3 and phosphorylated extracellular signal-regulated kinase (p-ERK). Mn treatment (1 and 6 h) also significantly (p < 0.01) dissipates the ΔΨm in astrocytes as evidenced by a decrease in mitochondrial TMRE fluorescence. These results suggest that activations of astrocytic caspase-3 and ERK are involved in Mn-induced neurotoxicity via mitochondrial-dependent pathways.

Original languageEnglish (US)
Pages (from-to)1-11
Number of pages11
JournalBrain research
Volume1203
DOIs
StatePublished - Apr 8 2008

Keywords

  • Astrocyte
  • ERK signaling pathway
  • Manganese
  • Manganese neurotoxicity
  • Mitochondria
  • Oxidative stress

ASJC Scopus subject areas

  • Neuroscience(all)
  • Molecular Biology
  • Clinical Neurology
  • Developmental Biology

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