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Related Concept Videos

Glial Cells01:04

Glial Cells

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Nervous Tissue: Glial Cells01:31

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Glia, or neuroglia, are vital support cells that assist neurons in their functions. The term "glia" originates from the Greek word for "glue," reflecting their role in holding the nervous system together. These cells can be categorized into six types: four in the central nervous system (CNS) and two in the peripheral nervous system (PNS).
The CNS glial cell includes the astrocytes, the oligodendrocytes, the microglia, and the ependymal cells.
Astrocytes are star-shaped glial...
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Neurogenesis and Regeneration of Nervous Tissue01:15

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In the CNS, neurogenesis, the birth of new neurons from stem cells, is limited to the hippocampus in adults. In other regions of the brain and spinal cord, neurogenesis is almost non-existent due to inhibitory influences from neuroglia, especially oligodendrocytes, and the absence of growth-stimulating cues. The myelin produced by oligodendrocytes in the CNS inhibits neuronal regeneration. Furthermore, astrocytes proliferate rapidly after neuronal damage, forming scar tissue that physically...
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Pathological Roles of Astrocytes in Traumatic Brain Injury.

Di Wu1, Yuxiao Ma1, Baofeng Wang1

  • 1Department of Neurosurgery, Ruijin Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai, P. R. China.

CNS Neuroscience & Therapeutics
|April 12, 2026
PubMed
Summary

Astrocytes play a dual role in traumatic brain injury (TBI), mediating both damage and repair. Targeting specific astrocyte pathways offers a promising therapeutic approach for TBI treatment.

Keywords:
astrocytesblood–brain barrier disruptionion channel dysregulationneuroinflammationoxidative stressreactive astrogliosistraumatic brain injury

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Area of Science:

  • Neuroscience
  • Cell Biology
  • Pathophysiology

Background:

  • Astrocytes exhibit dynamic changes following traumatic brain injury (TBI), including altered phenotypes, gene expression, and functions.
  • These glial cells are involved in both the damaging and protective processes after TBI.

Purpose of the Study:

  • To elucidate the multifaceted role and underlying mechanisms of astrocytes in TBI pathophysiology.
  • To integrate evidence from transcriptomic and mechanistic studies.

Main Methods:

  • A comprehensive literature review of studies on "astrocytes" and "traumatic brain injury" was conducted.
  • Evidence from transcriptomic analyses and mechanistic studies was synthesized.

Main Results:

  • Transcriptomic data reveal distinct neurotoxic (A1) and neuroprotective (A2) astrocyte phenotypes, with evidence of intermediate states.
  • TBI activates astrocytes through signaling pathways (TLR4/NF-κB, JAK/STAT3, MAPK), leading to ion homeostasis disruption, mitochondrial dysfunction, and increased reactive oxygen species.
  • Astrocyte interactions with other brain cells promote neuroinflammation, blood-brain barrier disruption, and neuronal apoptosis, while glial scar formation inhibits regeneration.

Conclusions:

  • Astrocytes are central mediators of secondary injury and repair in TBI.
  • Therapeutic strategies should focus on precise, context-dependent reprogramming of astrocyte responses rather than broad inhibition.
  • Targeting astrocyte-specific pathways, like TLR4 and NF-κB, holds potential for mitigating TBI-induced secondary injury and improving patient outcomes.