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Characterization and Isolation of Mouse Primary Microglia by Density Gradient Centrifugation
10:21

Characterization and Isolation of Mouse Primary Microglia by Density Gradient Centrifugation

Published on: February 16, 2018

Microglia provide neuroprotection after ischemia

Jens Neumann1, Matthias Gunzer, Herwig O Gutzeit

  • 1Leibniz Institute for Neurobiology, Project Group Neuropharmacology, Magdeburg, Germany.

FASEB Journal : Official Publication of the Federation of American Societies for Experimental Biology
|February 14, 2006
PubMed

Insights

Microglia, immune cells in the brain, protect neurons from damage after oxygen-glucose deprivation (OGD). This neuroprotection occurs within a specific time window, suggesting anti-inflammatory treatments may be counterproductive.

Area of Science:

  • Neuroscience
  • Immunology
  • Cell Biology

Background:

  • Neurological injuries often trigger acute inflammatory responses, primarily involving microglia activation.
  • Understanding microglia's role in acute brain injury is crucial for developing effective treatments.

Purpose of the Study:

  • To investigate the specific effects of microglia on neuronal damage following ischemic injury using an organotypic hippocampal slice culture model.
  • To determine the functional role of microglia-mediated neuroprotection and their interaction with neurons under oxygen-glucose deprivation (OGD) conditions.

Main Methods:

  • Utilized organotypic hippocampal slice cultures with exogenously applied, fluorescence-labeled BV2 microglia.
  • Assessed neuronal cell death via propidium iodide incorporation and Nissl staining after OGD.
  • Analyzed microglia migration and neuron-microglia interactions using time-resolved 3-D two-photon microscopy.

Main Results:

  • Microglia demonstrated significant neuroprotection against OGD-induced neuronal damage.
  • Microglia engaged in close physical contact with neurons in the affected brain areas.
  • Neuroprotection and migration were dependent on integrin regulator CD11a; CD11a-deficient microglia and HL-60 granulocytes did not show these effects.
  • OGD conditions enhanced microglia migration and neuron-microglia interaction deep within the slice.
  • LPS-prestimulated microglia lost their neuroprotective capacity, and pharmacological inhibition of microglia function reduced neuroprotection.
  • Neuroprotection was observed even when microglia were applied up to 4 hours post-OGD, defining a critical protective window.

Conclusions:

  • Activated microglia play a primary neuroprotective role in acute neurological insults like stroke and trauma.
  • The observed neuroprotection is mediated by specific cell-cell interactions and requires functional integrins.
  • Interfering with microglia function or implementing anti-inflammatory treatments within the identified protective time window could be detrimental.

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