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Inflammatory neurodegeneration and mechanisms of microglial killing of neurons

Guy C Brown1, Jonas J Neher

  • 1Department of Biochemistry, University of Cambridge, Tennis Court Road, Cambridge, CB2 1QW, UK. gcb@mole.bio.cam.ac.uk

Molecular Neurobiology
|March 3, 2010
PubMed

Insights

Inflammatory brain diseases involve microglia and astrocytes killing neurons. Key mechanisms include phagocyte NADPH oxidase (PHOX) activation and inducible nitric oxide synthase (iNOS) expression, leading to neuronal death.

Area of Science:

  • Neuroscience
  • Immunology
  • Pathology

Background:

  • Inflammatory neurodegeneration is a common factor in brain pathologies.
  • Microglia and astrocytes are key immune cells implicated in neuronal damage.
  • Existing research has identified several mechanisms of inflammatory-induced neuronal death in vitro.

Purpose of the Study:

  • To elucidate the specific mechanisms by which inflammatory-activated microglia and astrocytes induce neuronal death.
  • To investigate the roles of phagocyte NADPH oxidase (PHOX) and inducible nitric oxide synthase (iNOS) in neuronal apoptosis.
  • To understand the synergistic effects of these pathways and other factors like hypoxia on neuronal survival.

Main Methods:

  • Utilized cell culture models of inflammatory neurodegeneration.
  • Investigated the activation of phagocyte NADPH oxidase (PHOX) by various inflammatory stimuli.
  • Examined the expression and function of inducible nitric oxide synthase (iNOS) in glial cells.
  • Assessed neuronal apoptosis and survival under different experimental conditions, including PHOX activation, iNOS expression, and hypoxia.

Main Results:

  • Activation of PHOX by inflammatory stimuli promotes microglial proliferation and activation but causes minimal neuronal death alone.
  • Combined activation of PHOX and iNOS expression leads to significant neuronal apoptosis, mediated by peroxynitrite production.
  • Nitric oxide (NO) from iNOS synergizes with hypoxia to induce neuronal death through inhibition of cytochrome oxidase, leading to excitotoxicity.
  • Microglial phagocytosis of stressed neurons may further contribute to neuronal loss.

Conclusions:

  • PHOX and iNOS are critical mediators of inflammatory neurodegeneration.
  • The combination of PHOX activation and iNOS expression, particularly under hypoxic conditions, significantly enhances neuronal death.
  • Microglial phagocytosis plays a role in clearing stressed neurons, potentially exacerbating neurodegeneration.

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