The role of microglial mtDNA damage in age-dependent prolonged LPS-induced sickness behavior

Hiroshi Nakanishi, Yoshinori Hayashi, Hiro Take

研究成果: Contribution to journalArticle査読

17 被引用数 (Scopus)


Microglia are the main cellular source of oxidation products and inflammatory molecules in the brain during aging. The accumulation of mitochondrial DNA (mtDNA) oxidative damage in microglia during aging results in the increased production of reactive oxygen species (ROS). The increased intracellular ROS, in turn, activates a redox-sensitive nuclear factor-κB (NF-κB) to provoke excessive neuroinflammation, resulting in memory deficits and the prolonged behavioral consequence of infection. Besides its role in regulating the gene copy number, mitochondrial transcription factor A (TFAM) is closely associated with the stabilization of mtDNA structures. Lipopolysaccharide (LPS) induces the generation of ROS from the actively respirating mitochondria as well as NADPH oxidase, and leads to the subsequent activation of the NF-κB-dependent inflammatory pathway in aging microglia. The overexpression of human TFAM improves the age-dependent prolonged LPS-induced sickness behaviors by ameliorating the mtDNA damage and reducing the resultant redox-regulated inflammatory responses. Therefore, 'microglia-aging' plays important roles in the age-dependent enhanced behavioral consequences of infection.

ジャーナルNeuron Glia Biology
出版ステータス出版済み - 6 1 2012

All Science Journal Classification (ASJC) codes

  • Cell Biology
  • Cellular and Molecular Neuroscience

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