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Updated: May 9, 2026

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Brain inflammation and microglia: facts and misconceptions.

Hey-Kyeong Jeong1, Kyungmin Ji, Kyungjin Min

  • 1Neuroscience Graduate Program, Department of Biomedical Sciences, Ajou University School of Medicine, Suwon 442-721, Korea. ; Department of Pharmacology, Ajou University School of Medicine, Suwon 442-721, Korea. ; Chronic Inflammatory Disease Research Center, Ajou University School of Medicine, Suwon 442-721, Korea. ; National Research Lab of Brain Inflammation, Ajou University School of Medicine, Suwon 442-721, Korea.

Experimental Neurobiology
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PubMed
Summary

Brain inflammation involves microglia, astrocytes, blood cells, and neurons. This inflammation protects neurons and aids tissue repair after acute brain injury, rather than causing damage.

Keywords:
brain inflammationmicrogliarepair

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Area of Science:

  • Neuroscience
  • Immunology
  • Cell Biology

Background:

  • Acute injury typically triggers inflammation for defense and repair.
  • Brain injury differs due to low infection risk and limited neuron regeneration.
  • Existing studies often miss early inflammatory responses in brain injury models.

Purpose of the Study:

  • To investigate the role and regulation of inflammation in acute brain injury.
  • To analyze the immediate cellular responses following brain injury.
  • To understand the protective or damaging effects of brain inflammation.

Main Methods:

  • In vitro studies using cultured microglia (brain macrophages).
  • In vivo experimental models of brain inflammation.
  • Analysis of cell behavior immediately after injury onset.

Main Results:

  • Microglia, astrocytes, blood inflammatory cells, and neurons all participate in brain inflammation.
  • This inflammation is initiated immediately after injury.
  • Brain inflammation was found to protect neurons and repair the microenvironment.

Conclusions:

  • Brain inflammation is a complex process involving multiple cell types.
  • The observed inflammation following brain injury is neuroprotective and reparative.
  • Understanding early inflammatory patterns is crucial for brain injury research.