Expression of Th1/Th2-Related Chemokine Receptors on Peripheral T Cells and Correlation with Clinical Disease Activity in Patients with Multiple Sclerosis

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Abstract
Th1 cells play an important role in the pathogenesis of multiple sclerosis (MS), a disease likely linked to an autoimmune process. We measured the levels of chemokines in serum or cerebrospinal fluid (CSF) samples by ELISA, and also studied the expression of Th1-related CXCR3/CCR5 chemokine receptors and Th2-related CCR4/CCR3 chemokine receptors on blood cells from MS patients using three-color flow cytometry. The Bonferroni correction was used for the statistical analysis. The levels of CXCL10, CCL3, and CCL5 in the CSF samples for the MS groups were significantly higher than those for the control group. However, the levels of CCL2 in both the CSF and serum samples for the remission group were significantly higher than those for the active group. The percentage of CXCR3-expressing CD4+ T cells in patients with MS was significantly elevated compared with the healthy controls. Moreover, MS patients in an active phase showed a more increased CD4+CXCR3+/CD4+CCR4+ ratio than patients in a remission phase. The increased percentage of CD4+CXCR3+ cells in the blood was associated with relapses in MS. This study suggested that the CD4+CXCR3+/CD4+CCR4+ ratio could be a sensitive maker of immune dysfunction in MS.