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Microglial CR3 activation triggers long-term synaptic depression in the hippocampus via NADPH oxidase

Jingfei Zhang1, Aqsa Malik1, Hyun B Choi1

  • 1Brain Research Centre, Department of Psychiatry, University of British Columbia, Vancouver, BC V6T 2B5, Canada.

Neuron
|March 18, 2014
PubMed

Insights

Combined hypoxia and inflammation synergistically trigger microglial complement receptor 3 (CR3)-dependent long-term synaptic depression (LTD). This process involves NADPH oxidase and AMPA receptor internalization, contributing to synaptic dysfunction in brain disorders.

Area of Science:

  • Neuroscience
  • Neuroinflammation
  • Synaptic Plasticity

Background:

  • Microglial complement receptor 3 (CR3) activation is implicated in neuroinflammation and synaptic pruning.
  • Hypoxia often co-occurs with neuroinflammation in brain injuries and diseases, potentially worsening damage.

Purpose of the Study:

  • To investigate the synergistic effects of hypoxia and lipopolysaccharide (LPS)-induced inflammation on synaptic function.
  • To elucidate the molecular mechanisms underlying hypoxia- and inflammation-induced synaptic changes, focusing on microglial CR3.

Main Methods:

  • Combined exposure of brain tissue to hypoxia and LPS.
  • Assessment of long-term synaptic depression (LTD).
  • Investigation of the roles of microglial CR3, NADPH oxidase, and AMPA receptor internalization.

Main Results:

  • Hypoxia and LPS synergistically induce long-term synaptic depression (LTD).
  • This LTD requires microglial CR3 activation, NADPH oxidase, and GluA2-mediated AMPA receptor internalization.
  • The observed LTD is independent of NMDARs, mGluRs, or patterned synaptic activity.

Conclusions:

  • Microglial CR3 plays a critical role in mediating synaptic depression under combined hypoxic and inflammatory conditions.
  • This CR3-dependent LTD pathway may contribute to memory deficits and synaptic disruption in neuroinflammatory brain disorders.

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