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Increased interleukin-6 levels in cerebrospinal fluid following subarachnoid hemorrhage
T Mathiesen1, B Andersson, A Loftenius
1Department of Neurosurgery, Karolinska Institute, Stockholm, Sweden.
Insights
Following subarachnoid hemorrhage (SAH), patients showed significantly elevated interleukin-6 (IL-6) and soluble IL-2 receptor (IL-2R) in cerebrospinal fluid (CSF), indicating central nervous system inflammation.
Area of Science:
- Neuroscience
- Immunology
- Clinical Medicine
Background:
- Subarachnoid hemorrhage (SAH) is a critical neurological condition.
- Understanding the central nervous system's immune response post-SAH is crucial for patient outcomes.
Purpose of the Study:
- To determine the immune activation profile in patients following SAH.
- To investigate the intrathecal synthesis of inflammatory markers.
Main Methods:
- Analysis of serum and cerebrospinal fluid (CSF) samples from 12 SAH patients.
- Quantification of interleukin-6 (IL-6), soluble IL-2 receptor (IL-2R), and soluble CD8 levels.
Main Results:
- Markedly increased CSF levels of IL-6 and moderate increases in soluble IL-2R in 11/12 patients.
- Elevated CSF IL-6 peaked around Day 6.
- CSF marker elevations were not mirrored in serum, suggesting intrathecal synthesis.
Conclusions:
- SAH triggers a significant inflammatory response within the central nervous system.
- Intrathecal production of IL-6 and other markers likely contributes to CNS inflammation post-SAH.
- These findings may be key to understanding the clinical course and management of SAH.
Abstract:
Serum and cerebrospinal fluid (CSF) samples from 12 patients were analyzed for interleukin (IL)-6, soluble IL-2 receptor (IL-2R), and soluble CD8 levels in order to determine the immune activation profile following subarachnoid hemorrhage (SAH). Dramatically increased levels of IL-6 and moderate increases of soluble IL-2R were detected in the CSF in 11 of the 12 patients; slightly elevated levels of soluble CD8 were observed in six patients. The IL-6 levels were higher on Day 6 than on Days 3 and 9. The increases in IL-6, soluble IL-2R, and soluble CD8 levels in the CSF samples were not paralleled by increased values in the serum samples, and thus probably reflected an intrathecal synthesis of the cytokine. Passive transfer of IL-6 across the blood-brain barrier seemed not to occur since the serum and CSF levels of IL-6 showed a negative correlation. The findings suggest a severe inflammatory affection of the central nervous system that could be of importance in understanding the clinical course in patients following SAH.