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[Stress Mediated Microglial Hyper-Activation and Psychiatric Diseases]

Shingo Enomoto1, Takahiro A Kato

  • 1Self Defense Force, Fukuoka Hospital.

Brain and Nerve = Shinkei Kenkyu No Shinpo
|July 8, 2021
PubMed

Insights

Microglia, immune cells in the brain, are implicated in stress-related disorders like depression and PTSD. Their dysfunction affects memory and inflammation, necessitating further human and animal research for effective treatments.

Area of Science:

  • Neuroscience
  • Psychiatry
  • Immunology

Background:

  • Stress is a known trigger for depression and post-traumatic stress disorder (PTSD).
  • Microglial hyperactivation and dysfunction are increasingly recognized in the pathophysiology of these stress-related psychiatric disorders.
  • Microglia play crucial roles in brain immunity, synaptic plasticity, and neuronal function.

Purpose of the Study:

  • To review microglial functional changes in animal models and human studies related to depression and PTSD.
  • To explore the role of microglial cytokine and neurotrophic factor release in stress-induced behavioral changes.
  • To investigate the potential of reverse-translational research using human peripheral blood to understand microglial involvement in depression.

Main Methods:

  • Review of animal models exhibiting PTSD-like fear memory dysregulation.
  • Analysis of human clinical studies focusing on microglia in depression and PTSD.
  • Examination of positron emission tomography (PET) studies using TSPO ligands in patients.
  • Conducting reverse-translational research using human peripheral blood samples.

Main Results:

  • Animal models show abnormal microglial cytokine production linked to fear memory deficits and generalization in PTSD.
  • Impaired microglial phagocytosis may contribute to fear generalization and forgetting.
  • PET studies suggest enhanced microglial inflammation in depression but suppressed inflammation in PTSD.
  • Human peripheral blood analysis is being used to explore microglial roles in depression.

Conclusions:

  • Microglial dysfunction is central to the pathophysiology of stress-related disorders like depression and PTSD.
  • Abnormalities in microglial cytokine release and phagocytosis significantly impact fear memory processing.
  • Discrepant inflammatory profiles in microglia between depression and PTSD warrant further investigation.
  • Integrated human and animal research is essential for understanding these disorders and developing targeted therapies.

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