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Related Experiment Videos

Complement activation in the human brain after traumatic head injury.

B M Bellander1, S K Singhrao, M Ohlsson

  • 1Department of Clinical Neuroscience, Section for Neurosurgery, Karolinska Hospital, Stockholm, Sweden. bob@neuro.ks.se

Journal of Neurotrauma
|January 10, 2002
PubMed
Summary

The complement cascade is activated in human traumatic brain contusions, contributing to secondary brain injury. This involves complement components like C3b and the membrane attack complex (MAC), C5b-9, in injured brain tissue.

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Area of Science:

  • Neuroscience
  • Immunology
  • Pathology

Background:

  • The complement cascade's role in secondary brain injury after contusions is suggested by animal studies.
  • Traumatic brain injury (TBI) can lead to secondary damage, exacerbating initial injury.

Purpose of the Study:

  • To investigate the involvement of the complement cascade in human traumatic brain contusions.
  • To identify specific complement components and their localization in injured brain tissue.

Main Methods:

  • Analysis of resected brain tissue from 16 TBI patients and 3 epilepsy controls.
  • Immunohistochemistry for complement components (C1q, C3b, C3d, C5b-9) and clusterin.
  • In situ hybridization for C3-mRNA.

Main Results:

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  • Increased immunoreactivity for C1q, C3b, C3d, and the membrane attack complex (MAC), C5b-9, near neurons in the contusion penumbra.
  • Evidence of local complement synthesis via C3-mRNA in the penumbra.
  • Upregulation of the complement regulator clusterin in neurons within the penumbra.

Conclusions:

  • Histological evidence confirms complement cascade activation in the human brain's cortical contusion penumbra.
  • Local complement synthesis and activation, potentially triggered by neuronal debris, contribute to secondary brain damage.
  • Activated complement components may mediate inflammation, edema, and direct membrane damage via MAC formation.