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Intracerebral inflammation after human brain contusion
S Holmin1, J Söderlund, P Biberfeld
1Department of Clinical Neuroscience, Karolinska Institute, Stockholm, Sweden.
Neurosurgery
|March 3, 1998
Summary
Inflammation in brain contusions evolves from early intravascular polymorphonuclear cells to later parenchymal infiltration by monocytes, macrophages, microglia, and T lymphocytes, potentially causing cellular degeneration.
Area of Science:
- Neuroscience
- Immunology
- Pathology
Background:
- Brain contusions trigger inflammatory responses.
- Understanding these responses is crucial for managing traumatic brain injury.
Purpose of the Study:
- To analyze inflammatory components in human brain contusions.
- To compare findings with experimental data on brain contusion pathogenesis.
Main Methods:
- Immunohistochemistry analysis of contused brain tissue biopsies.
- Samples obtained from 12 patients 3 hours to 5 days post-trauma.
Main Results:
- Early phase (<24h): Limited inflammation, mainly polymorphonuclear cells (PMNs) in blood vessels.
- Late phase (3-5 days): Massive parenchymal inflammation with monocytes/macrophages, microglia, PMNs, CD4+/CD8+ T lymphocytes.
- Microglia expressed Human Leukocyte Antigen-DQ and CD1a (dendritic cell marker).
Conclusions:
- Early inflammation is intravascular, dominated by PMNs.
- Later inflammation is parenchymal, involving diverse immune cells.
- Delayed brain swelling correlates with parenchymal inflammation, potentially causing cellular damage.