T-cells in the Cerebrospinal Fluid Express a Similar Repertoire of Inflammatory Chemokine Receptors in the Absence or Presence of CNS Inflammation: Implications for CNS Trafficking
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It is believed that chemokines and their receptors are involved in trafficking of T-cells to the central nervous system (CNS). The aim of the current study was to define the expression on cerebrospinal fluid (CSF) T-cells of six chemokine receptors associated with trafficking to sites of inflammation. Flow cytometry was used to detect chemokine receptor expression. We observed that CD3+T-cells in the CSF express a restricted array of inflammatory chemokine receptors, specifically CXCR3, CCR5 and CCR6, but little CCR1-3. This repertoire was independent of the presence of CNS inflammation, since comparable findings were obtained in patients with multiple sclerosis (MS) and individuals with non-inflammatory neurological diseases. The enrichment of CCR5+T-cells in the CSF could largely be explained by higher frequency of CD4+/CD45RO+T-cells in this compartment. In contrast, CD4+/CD45RO+T-cells expressing CXCR3 were significantly enriched in CSF as compared with blood. Similar levels of CCR6+/CD3+T-cells were observed in blood and CSF, while levels of CCR2+/CD3+T-cells were lower in CSF than in blood. The CSF was virtually devoid of CCR5+/CXCR3- T-cells, suggesting that the expression of CCR5 alone is not sufficient for the trafficking of CD3+T-cells to the CSF. We hypothesize that CXCR3 is the principal inflammatory chemokine receptor involved in intrathecal accumulation of T-cells in MS. Through interactions with its ligands, CXCR3 is proposed to mediate retention of T-cells in the inflamed CNS.
Espinoza D, Zrzavy T, Breville G, Thebault S, Marefi A, Mexhitaj I bioRxiv. 2025; .
PMID: 40060552 PMC: 11888486. DOI: 10.1101/2025.02.27.637541.
Yang H, Liu W, Gao T, Liu Q, Zhang M, Liu Y Front Immunol. 2024; 15:1438645.
PMID: 39315097 PMC: 11416947. DOI: 10.3389/fimmu.2024.1438645.
Waede M, Voss L, Kingo C, Moeller J, Elkjaer M, Illes Z Ann Clin Transl Neurol. 2024; 11(10):2657-2672.
PMID: 39279291 PMC: 11514931. DOI: 10.1002/acn3.52182.
The interplay between T helper cells and brain barriers in the pathogenesis of multiple sclerosis.
Angelini G, Bani A, Constantin G, Rossi B Front Cell Neurosci. 2023; 17:1101379.
PMID: 36874213 PMC: 9975172. DOI: 10.3389/fncel.2023.1101379.
Shinoda K, Li R, Rezk A, Mexhitaj I, Patterson K, Kakara M Proc Natl Acad Sci U S A. 2023; 120(3):e2207291120.
PMID: 36634138 PMC: 9934304. DOI: 10.1073/pnas.2207291120.