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Updated: Aug 13, 2026
Isolation of Brain-infiltrating Leukocytes
Published on: June 13, 2011
Lymphocyte phenotype and subset distribution in normal cerebrospinal fluid
A Svenningsson1, O Andersen, M Edsbagge
1Department of Clinical Neuroscience, University of Gothenburg, Sahlgren's University Hospital, Sweden.
Insights
Normal cerebrospinal fluid (CSF) contains mostly T lymphocytes, with few B and NK cells, differing significantly from peripheral blood (PB). Some T cells show activation markers, particularly when co-expressing NK cell markers.
Area of Science:
- Neuroimmunology
- Immunology
- Flow Cytometry
Background:
- Cerebrospinal fluid (CSF) immune cell composition is crucial for understanding central nervous system (CNS) health and disease.
- Previous studies have not fully characterized the normal lymphocyte subpopulations and their activation status in CSF.
Purpose of the Study:
- To investigate the distribution and phenotype of lymphocyte subpopulations in the CSF of healthy individuals.
- To compare CSF lymphocyte characteristics with those found in peripheral blood (PB).
Main Methods:
- Two- and three-color flow cytometry was used to analyze lymphocyte populations.
- Analysis included CD3+ T cells, CD4+ and CD8+ T cell subsets, B lymphocytes, and NK cells.
- Expression of activation markers (HLA-DR, CD25) was assessed.
Main Results:
- CSF lymphocytes were predominantly CD3+ T cells, with low numbers of B and NK cells, unlike PB.
- Most CSF T lymphocytes displayed a memory/primed cell phenotype.
- A subset of T lymphocytes co-expressing CD56/CD16 showed increased HLA-DR expression in CSF compared to PB.
Conclusions:
- The cellular composition of normal CSF significantly differs from PB across major lymphocyte subpopulations.
- These findings highlight distinct immune profiles in the CNS and are essential for interpreting immune responses in neurological conditions.
Abstract:
The distribution of lymphocyte subpopulations in cerebrospinal fluid (CSF) and their phenotypic characteristics were extensively investigated in a group of 18 healthy individuals using two- and three-color flow cytometry. Generally, CD3+ T lymphocytes constituted the vast majority of CSF lymphocytes while the number of B lymphocytes and NK cells were low. Most T lymphocytes exhibited the phenotype of memory/primed cells in both the CD4+ and CD8+ subpopulations. Two markers for recent activation, HLA-DR and interleukin-2 receptor (CD25) were not upregulated when compared with peripheral blood (PB) in the majority of CSF T lymphocytes. However, a fraction of T lymphocytes co-expressing the NK cells markers CD56 and/or CD16 showed a pronounced upregulation of HLA-DR in CSF as compared with PB. This study documents that the cellular composition of the normal CSF differs profoundly from PB regarding all major lymphocyte subpopulations. This has to be taken into account in studies addressing questions regarding cellular immune reactions in the central nervous system under pathological conditions.
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