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Central memory CD4+ T cells dominate the normal cerebrospinal fluid

Marieke T de Graaf1, Peter A E Sillevis Smitt, Ronald L Luitwieler

  • 1Department of Neurology, Erasmus University Medical Center, s-Gravendijkwal 230, 3015 CE Rotterdam, The Netherlands.

Cytometry. Part B, Clinical Cytometry
|July 16, 2010
PubMed

Insights

Establishing reference values for white blood cell (WBC) subsets in cerebrospinal fluid (CSF) is crucial for diagnosing neuro-inflammatory diseases. This study found a predominance of CD4(+) T cells with a central memory phenotype in CSF, suggesting active immune responses in the central nervous system (CNS).

Area of Science:

  • Neuroimmunology
  • Immunology
  • Cell Biology

Background:

  • Cerebrospinal fluid (CSF) immune phenotyping requires established reference values for white blood cell (WBC) subsets.
  • Understanding normal immune cell populations in CSF is vital for diagnosing and researching neuro-inflammatory conditions.

Purpose of the Study:

  • To establish reference values for WBC subsets in CSF using immune phenotyping.
  • To characterize the distribution and phenotype of immune cells in the central nervous system (CNS) under normal conditions.

Main Methods:

  • 6-color flow cytometry was used to analyze paired CSF and blood samples from 84 healthy individuals.
  • Absolute counts and percentages of various leukocyte subsets, including lymphocytes (T, NK, NKT, B cells), granulocytes, monocytes, and dendritic cells, were quantified.
  • T cell subsets were further analyzed for naive, central memory, effector memory, and regulatory phenotypes.

Main Results:

  • CSF demonstrated a higher proportion of T cells compared to blood, with granulocytes, B cells, and NK cells being less frequent.
  • CD4(+) T cells constituted the majority (approximately 70%) of T cells in CSF, predominantly exhibiting a central memory phenotype (approximately 90%).
  • B cells were nearly absent (<1%) in CSF, while myeloid dendritic cells were more abundant than plasmacytoid dendritic cells in CSF compared to blood.

Conclusions:

  • The study provides essential reference values for WBC subsets in CSF, aiding in the investigation of neuro-inflammatory diseases.
  • The significant presence of CD4(+) T cells with a central memory phenotype and dendritic cells in CSF indicates an active adaptive immune response in the normal CNS.
Abstract

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