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CD200R/Foxp3-mediated signalling regulates microglial activation.

Min-Hee Yi1,2, Enji Zhang1,3, Jwa-Jin Kim4

  • 1Department of Anatomy, Brain Research Institute, Chungnam National University School of Medicine, Daejeon, 301-747, Republic of Korea.

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Foxp3 transcription factor is crucial for beneficial microglial responses in the brain. Enhancing CD200 receptor signaling boosts Foxp3, promoting neuroprotection and neuronal survival.

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Area of Science:

  • Neuroscience
  • Immunology
  • Molecular Biology

Background:

  • Microglia exhibit diverse functions, with beneficial or detrimental roles depending on the context.
  • The transcriptional mechanisms driving beneficial microglial phenotypes remain largely unelucidated.

Purpose of the Study:

  • To investigate the role of Foxp3 in microglial beneficial responses.
  • To explore the dependence of Foxp3 on CD200 receptor (CD200R) signaling in neuroinflammation.

Main Methods:

  • Examined Foxp3 expression in microglia during excitotoxicity-induced hippocampal neuroinflammation.
  • Manipulated CD200R signaling and Foxp3 expression to assess microglial phenotypes.
  • Investigated the phosphorylation of STAT6 as a downstream effector of CD200R.

Main Results:

  • Foxp3 expression was upregulated in activated microglia.
  • CD200R suppression hindered the anti-inflammatory microglial phenotype, while Foxp3 overexpression enhanced it.
  • STAT6 phosphorylation modulated Foxp3 transcription, and CD200R/Foxp3 signaling improved neuronal viability and neuroprotection.

Conclusions:

  • Foxp3 is essential for the beneficial outcomes of microglial responses.
  • CD200R signaling enhances beneficial microglial phenotypes through Foxp3.
  • Targeting CD200R/Foxp3 signaling offers a potential neuroprotective strategy.