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Dynamic cell type-specific expression of Nrf2 after traumatic brain injury in mice

Wenwen Dong1, Yingfu Sun1, Hao Cheng1

  • 1Department of Forensic Pathology, China Medical University School of Forensic Medicine, Shenyang, China.

The European Journal of Neuroscience
|March 5, 2019
PubMed

Insights

Nuclear factor erythroid 2-related factor 2 (Nrf2) expression changes dynamically in different brain cells after traumatic brain injury (TBI). Understanding these changes in neurons, astrocytes, microglia, and NG2 glia is crucial for TBI treatment.

Area of Science:

  • Neuroscience
  • Cell Biology
  • Biochemistry

Background:

  • Nuclear factor erythroid 2-related factor 2 (Nrf2) is vital for antioxidant and anti-inflammatory responses, particularly after traumatic brain injury (TBI).
  • While Nrf2 activation post-TBI is known, its dynamic expression patterns and cell-specific roles remain incompletely understood.

Purpose of the Study:

  • To investigate the temporal dynamics and cell-type specific expression of Nrf2 in the brain following TBI.
  • To elucidate the distinct roles Nrf2 may play in neurons and glial cells during the post-TBI recovery period.

Main Methods:

  • A Feeney weight-drop contusion model was used to induce TBI in a rodent model.
  • Western blot analysis measured overall Nrf2 protein levels at 1, 3, 7, and 14 days post-injury.
  • Double immunofluorescence staining with cell-specific markers (NeuN, GFAP, IBA1, NG2) identified Nrf2 localization in neurons, astrocytes, microglia, and NG2 glia.

Main Results:

  • Nrf2 protein levels peaked at 1 day post-TBI (dpi), primarily localized in neurons.
  • Astrocytes showed sustained, weaker Nrf2 expression peaking at 7 dpi.
  • Microglia exhibited inducible Nrf2 expression in the nucleus, with peak numbers at 7 dpi.
  • NG2 glia displayed Nrf2 colocalization, reaching a maximum at 3 dpi.

Conclusions:

  • Nrf2 exhibits distinct temporal expression patterns across different neural cell types after TBI.
  • These cell-specific and time-dependent changes suggest Nrf2 mediates diverse pathophysical roles in neurons and glia post-TBI.
  • Further understanding of Nrf2's dynamic behavior can inform therapeutic strategies for TBI.
Keywords:
NG2 gliaastrocytesmicroglianeuronsnuclear factor erythroid 2-related factor 2traumatic brain injury

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