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Complement activation in the brain after experimental intracerebral hemorrhage
1Department of Surgery (Neurosurgery), University of Michigan, Ann Arbor 48109-0532, USA.
Journal of Neurosurgery
|June 6, 2000
Summary
Intracerebral hemorrhage (ICH) activates the brain's complement cascade, leading to edema. Inhibiting this complement activation significantly reduces brain swelling after ICH, suggesting a therapeutic target.
Area of Science:
- Neuroscience
- Immunology
- Pathology
Background:
- Brain edema following intracerebral hemorrhage (ICH) is linked to erythrocyte lysis and hemoglobin release.
- Erythrocyte lysis may be mediated by the complement cascade, potentially triggering parenchymal injury.
Purpose of the Study:
- To investigate complement cascade activation following ICH in a rat model.
- To determine if inhibiting complement activation can reduce brain edema around the hematoma.
Main Methods:
- Autologous blood infusion into rat basal ganglia to induce ICH.
- Immunohistochemical and Western blot analyses to detect complement factors (C9, C3d, clusterin).
- Administration of N-acetylheparin (complement inhibitor) to assess its effect on brain edema.
Main Results:
- ICH significantly increased complement factor C9 around the hematoma at 24 and 72 hours.
- Clusterin levels also increased post-ICH, with neuronal expression at 72 hours.
- N-acetylheparin administration significantly reduced brain edema at 24 and 72 hours post-ICH.
Conclusions:
- Intracerebral hemorrhage triggers complement activation within the brain.
- Complement activation and membrane attack complex formation contribute to brain edema after ICH.
- Inhibiting the complement cascade represents a potential therapeutic strategy for ICH.